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4.11 is going to be a relatively large release for KVM, with a little over 

200 commits and noteworthy changes for most architectures.
 
 * ARM:
 - GICv3 save/restore
 - cache flushing fixes
 - working MSI injection for GICv3 ITS
 - physical timer emulation
 
 * MIPS:
 - various improvements under the hood
 - support for SMP guests
 - a large rewrite of MMU emulation.  KVM MIPS can now use MMU notifiers
 to support copy-on-write, KSM, idle page tracking, swapping, ballooning
 and everything else.  KVM_CAP_READONLY_MEM is also supported, so that
 writes to some memory regions can be treated as MMIO.  The new MMU also
 paves the way for hardware virtualization support.
 
 * PPC:
 - support for POWER9 using the radix-tree MMU for host and guest
 - resizable hashed page table
 - bugfixes.
 
 * s390: expose more features to the guest
 - more SIMD extensions
 - instruction execution protection
 - ESOP2
 
 * x86:
 - improved hashing in the MMU
 - faster PageLRU tracking for Intel CPUs without EPT A/D bits
 - some refactoring of nested VMX entry/exit code, preparing for live
 migration support of nested hypervisors
 - expose yet another AVX512 CPUID bit
 - host-to-guest PTP support
 - refactoring of interrupt injection, with some optimizations thrown in
 and some duct tape removed.
 - remove lazy FPU handling
 - optimizations of user-mode exits
 - optimizations of vcpu_is_preempted() for KVM guests
 
 * generic:
 - alternative signaling mechanism that doesn't pound on tsk->sighand->siglock
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull KVM updates from Paolo Bonzini:
 "4.11 is going to be a relatively large release for KVM, with a little
  over 200 commits and noteworthy changes for most architectures.

  ARM:
   - GICv3 save/restore
   - cache flushing fixes
   - working MSI injection for GICv3 ITS
   - physical timer emulation

  MIPS:
   - various improvements under the hood
   - support for SMP guests
   - a large rewrite of MMU emulation. KVM MIPS can now use MMU
     notifiers to support copy-on-write, KSM, idle page tracking,
     swapping, ballooning and everything else. KVM_CAP_READONLY_MEM is
     also supported, so that writes to some memory regions can be
     treated as MMIO. The new MMU also paves the way for hardware
     virtualization support.

  PPC:
   - support for POWER9 using the radix-tree MMU for host and guest
   - resizable hashed page table
   - bugfixes.

  s390:
   - expose more features to the guest
   - more SIMD extensions
   - instruction execution protection
   - ESOP2

  x86:
   - improved hashing in the MMU
   - faster PageLRU tracking for Intel CPUs without EPT A/D bits
   - some refactoring of nested VMX entry/exit code, preparing for live
     migration support of nested hypervisors
   - expose yet another AVX512 CPUID bit
   - host-to-guest PTP support
   - refactoring of interrupt injection, with some optimizations thrown
     in and some duct tape removed.
   - remove lazy FPU handling
   - optimizations of user-mode exits
   - optimizations of vcpu_is_preempted() for KVM guests

  generic:
   - alternative signaling mechanism that doesn't pound on
     tsk->sighand->siglock"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (195 commits)
  x86/kvm: Provide optimized version of vcpu_is_preempted() for x86-64
  x86/paravirt: Change vcp_is_preempted() arg type to long
  KVM: VMX: use correct vmcs_read/write for guest segment selector/base
  x86/kvm/vmx: Defer TR reload after VM exit
  x86/asm/64: Drop __cacheline_aligned from struct x86_hw_tss
  x86/kvm/vmx: Simplify segment_base()
  x86/kvm/vmx: Get rid of segment_base() on 64-bit kernels
  x86/kvm/vmx: Don't fetch the TSS base from the GDT
  x86/asm: Define the kernel TSS limit in a macro
  kvm: fix page struct leak in handle_vmon
  KVM: PPC: Book3S HV: Disable HPT resizing on POWER9 for now
  KVM: Return an error code only as a constant in kvm_get_dirty_log()
  KVM: Return an error code only as a constant in kvm_get_dirty_log_protect()
  KVM: Return directly after a failed copy_from_user() in kvm_vm_compat_ioctl()
  KVM: x86: remove code for lazy FPU handling
  KVM: race-free exit from KVM_RUN without POSIX signals
  KVM: PPC: Book3S HV: Turn "KVM guest htab" message into a debug message
  KVM: PPC: Book3S PR: Ratelimit copy data failure error messages
  KVM: Support vCPU-based gfn->hva cache
  KVM: use separate generations for each address space
  ...
This commit is contained in:
Linus Torvalds 2017-02-22 18:22:53 -08:00
parent 5066e4a340 dd0fd8bca1
commit fd7e9a8834
110 changed files with 7361 additions and 3052 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

138
Documentation/virtual/kvm/api.txt
View File

@ -2061,6 +2061,8 @@ registers, find a list below:
MIPS | KVM_REG_MIPS_LO | 64
MIPS | KVM_REG_MIPS_PC | 64
MIPS | KVM_REG_MIPS_CP0_INDEX | 32
MIPS | KVM_REG_MIPS_CP0_ENTRYLO0 | 64
MIPS | KVM_REG_MIPS_CP0_ENTRYLO1 | 64
MIPS | KVM_REG_MIPS_CP0_CONTEXT | 64
MIPS | KVM_REG_MIPS_CP0_USERLOCAL | 64
MIPS | KVM_REG_MIPS_CP0_PAGEMASK | 32
@ -2071,9 +2073,11 @@ registers, find a list below:
MIPS | KVM_REG_MIPS_CP0_ENTRYHI | 64
MIPS | KVM_REG_MIPS_CP0_COMPARE | 32
MIPS | KVM_REG_MIPS_CP0_STATUS | 32
MIPS | KVM_REG_MIPS_CP0_INTCTL | 32
MIPS | KVM_REG_MIPS_CP0_CAUSE | 32
MIPS | KVM_REG_MIPS_CP0_EPC | 64
MIPS | KVM_REG_MIPS_CP0_PRID | 32
MIPS | KVM_REG_MIPS_CP0_EBASE | 64
MIPS | KVM_REG_MIPS_CP0_CONFIG | 32
MIPS | KVM_REG_MIPS_CP0_CONFIG1 | 32
MIPS | KVM_REG_MIPS_CP0_CONFIG2 | 32
@ -2148,6 +2152,12 @@ patterns depending on whether they're 32-bit or 64-bit registers:
0x7020 0000 0001 00 <reg:5> <sel:3> (32-bit)
0x7030 0000 0001 00 <reg:5> <sel:3> (64-bit)
Note: KVM_REG_MIPS_CP0_ENTRYLO0 and KVM_REG_MIPS_CP0_ENTRYLO1 are the MIPS64
versions of the EntryLo registers regardless of the word size of the host
hardware, host kernel, guest, and whether XPA is present in the guest, i.e.
with the RI and XI bits (if they exist) in bits 63 and 62 respectively, and
the PFNX field starting at bit 30.
MIPS KVM control registers (see above) have the following id bit patterns:
0x7030 0000 0002 <reg:16>
@ -2443,18 +2453,20 @@ are, it will do nothing and return an EBUSY error.
The parameter is a pointer to a 32-bit unsigned integer variable
containing the order (log base 2) of the desired size of the hash
table, which must be between 18 and 46. On successful return from the
ioctl, it will have been updated with the order of the hash table that
was allocated.
ioctl, the value will not be changed by the kernel.
If no hash table has been allocated when any vcpu is asked to run
(with the KVM_RUN ioctl), the host kernel will allocate a
default-sized hash table (16 MB).
If this ioctl is called when a hash table has already been allocated,
the kernel will clear out the existing hash table (zero all HPTEs) and
return the hash table order in the parameter. (If the guest is using
the virtualized real-mode area (VRMA) facility, the kernel will
re-create the VMRA HPTEs on the next KVM_RUN of any vcpu.)
with a different order from the existing hash table, the existing hash
table will be freed and a new one allocated. If this is ioctl is
called when a hash table has already been allocated of the same order
as specified, the kernel will clear out the existing hash table (zero
all HPTEs). In either case, if the guest is using the virtualized
real-mode area (VRMA) facility, the kernel will re-create the VMRA
HPTEs on the next KVM_RUN of any vcpu.
4.77 KVM_S390_INTERRUPT
@ -3177,7 +3189,7 @@ of IOMMU pages.
The rest of functionality is identical to KVM_CREATE_SPAPR_TCE.
4.98 KVM_REINJECT_CONTROL
4.99 KVM_REINJECT_CONTROL
Capability: KVM_CAP_REINJECT_CONTROL
Architectures: x86
@ -3201,7 +3213,7 @@ struct kvm_reinject_control {
pit_reinject = 0 (!reinject mode) is recommended, unless running an old
operating system that uses the PIT for timing (e.g. Linux 2.4.x).
4.99 KVM_PPC_CONFIGURE_V3_MMU
4.100 KVM_PPC_CONFIGURE_V3_MMU
Capability: KVM_CAP_PPC_RADIX_MMU or KVM_CAP_PPC_HASH_MMU_V3
Architectures: ppc
@ -3232,7 +3244,7 @@ process table, which is in the guest's space. This field is formatted
as the second doubleword of the partition table entry, as defined in
the Power ISA V3.00, Book III section 5.7.6.1.
4.100 KVM_PPC_GET_RMMU_INFO
4.101 KVM_PPC_GET_RMMU_INFO
Capability: KVM_CAP_PPC_RADIX_MMU
Architectures: ppc
@ -3266,6 +3278,101 @@ The ap_encodings gives the supported page sizes and their AP field
encodings, encoded with the AP value in the top 3 bits and the log
base 2 of the page size in the bottom 6 bits.
4.102 KVM_PPC_RESIZE_HPT_PREPARE
Capability: KVM_CAP_SPAPR_RESIZE_HPT
Architectures: powerpc
Type: vm ioctl
Parameters: struct kvm_ppc_resize_hpt (in)
Returns: 0 on successful completion,
>0 if a new HPT is being prepared, the value is an estimated
number of milliseconds until preparation is complete
-EFAULT if struct kvm_reinject_control cannot be read,
-EINVAL if the supplied shift or flags are invalid
-ENOMEM if unable to allocate the new HPT
-ENOSPC if there was a hash collision when moving existing
HPT entries to the new HPT
-EIO on other error conditions
Used to implement the PAPR extension for runtime resizing of a guest's
Hashed Page Table (HPT). Specifically this starts, stops or monitors
the preparation of a new potential HPT for the guest, essentially
implementing the H_RESIZE_HPT_PREPARE hypercall.
If called with shift > 0 when there is no pending HPT for the guest,
this begins preparation of a new pending HPT of size 2^(shift) bytes.
It then returns a positive integer with the estimated number of
milliseconds until preparation is complete.
If called when there is a pending HPT whose size does not match that
requested in the parameters, discards the existing pending HPT and
creates a new one as above.
If called when there is a pending HPT of the size requested, will:
* If preparation of the pending HPT is already complete, return 0
* If preparation of the pending HPT has failed, return an error
code, then discard the pending HPT.
* If preparation of the pending HPT is still in progress, return an
estimated number of milliseconds until preparation is complete.
If called with shift == 0, discards any currently pending HPT and
returns 0 (i.e. cancels any in-progress preparation).
flags is reserved for future expansion, currently setting any bits in
flags will result in an -EINVAL.
Normally this will be called repeatedly with the same parameters until
it returns <= 0. The first call will initiate preparation, subsequent
ones will monitor preparation until it completes or fails.
struct kvm_ppc_resize_hpt {
__u64 flags;
__u32 shift;
__u32 pad;
};
4.103 KVM_PPC_RESIZE_HPT_COMMIT
Capability: KVM_CAP_SPAPR_RESIZE_HPT
Architectures: powerpc
Type: vm ioctl
Parameters: struct kvm_ppc_resize_hpt (in)
Returns: 0 on successful completion,
-EFAULT if struct kvm_reinject_control cannot be read,
-EINVAL if the supplied shift or flags are invalid
-ENXIO is there is no pending HPT, or the pending HPT doesn't
have the requested size
-EBUSY if the pending HPT is not fully prepared
-ENOSPC if there was a hash collision when moving existing
HPT entries to the new HPT
-EIO on other error conditions
Used to implement the PAPR extension for runtime resizing of a guest's
Hashed Page Table (HPT). Specifically this requests that the guest be
transferred to working with the new HPT, essentially implementing the
H_RESIZE_HPT_COMMIT hypercall.
This should only be called after KVM_PPC_RESIZE_HPT_PREPARE has
returned 0 with the same parameters. In other cases
KVM_PPC_RESIZE_HPT_COMMIT will return an error (usually -ENXIO or
-EBUSY, though others may be possible if the preparation was started,
but failed).
This will have undefined effects on the guest if it has not already
placed itself in a quiescent state where no vcpu will make MMU enabled
memory accesses.
On succsful completion, the pending HPT will become the guest's active
HPT and the previous HPT will be discarded.
On failure, the guest will still be operating on its previous HPT.
struct kvm_ppc_resize_hpt {
__u64 flags;
__u32 shift;
__u32 pad;
};
5. The kvm_run structure
------------------------
@ -3282,7 +3389,18 @@ struct kvm_run {
Request that KVM_RUN return when it becomes possible to inject external
interrupts into the guest. Useful in conjunction with KVM_INTERRUPT.
__u8 padding1[7];
__u8 immediate_exit;
This field is polled once when KVM_RUN starts; if non-zero, KVM_RUN
exits immediately, returning -EINTR. In the common scenario where a
signal is used to "kick" a VCPU out of KVM_RUN, this field can be used
to avoid usage of KVM_SET_SIGNAL_MASK, which has worse scalability.
Rather than blocking the signal outside KVM_RUN, userspace can set up
a signal handler that sets run->immediate_exit to a non-zero value.
This field is ignored if KVM_CAP_IMMEDIATE_EXIT is not available.
__u8 padding1[6];
/* out */
__u32 exit_reason;

11
Documentation/virtual/kvm/devices/arm-vgic-v3.txt
View File

@ -118,7 +118,7 @@ Groups:
-EBUSY: One or more VCPUs are running
KVM_DEV_ARM_VGIC_CPU_SYSREGS
KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS
Attributes:
The attr field of kvm_device_attr encodes two values:
bits: | 63 .... 32 | 31 .... 16 | 15 .... 0 |
@ -139,13 +139,15 @@ Groups:
All system regs accessed through this API are (rw, 64-bit) and
kvm_device_attr.addr points to a __u64 value.
KVM_DEV_ARM_VGIC_CPU_SYSREGS accesses the CPU interface registers for the
KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS accesses the CPU interface registers for the
CPU specified by the mpidr field.
CPU interface registers access is not implemented for AArch32 mode.
Error -ENXIO is returned when accessed in AArch32 mode.
Errors:
-ENXIO: Getting or setting this register is not yet supported
-EBUSY: VCPU is running
-EINVAL: Invalid mpidr supplied
-EINVAL: Invalid mpidr or register value supplied
KVM_DEV_ARM_VGIC_GRP_NR_IRQS
@ -204,3 +206,6 @@ Groups:
architecture defined MPIDR, and the field is encoded as follows:
| 63 .... 56 | 55 .... 48 | 47 .... 40 | 39 .... 32 |
| Aff3 | Aff2 | Aff1 | Aff0 |
Errors:
-EINVAL: vINTID is not multiple of 32 or
info field is not VGIC_LEVEL_INFO_LINE_LEVEL

35
Documentation/virtual/kvm/hypercalls.txt
View File

@ -81,3 +81,38 @@ the vcpu to sleep until occurrence of an appropriate event. Another vcpu of the
same guest can wakeup the sleeping vcpu by issuing KVM_HC_KICK_CPU hypercall,
specifying APIC ID (a1) of the vcpu to be woken up. An additional argument (a0)
is used in the hypercall for future use.
6. KVM_HC_CLOCK_PAIRING
------------------------
Architecture: x86
Status: active
Purpose: Hypercall used to synchronize host and guest clocks.
Usage:
a0: guest physical address where host copies
"struct kvm_clock_offset" structure.
a1: clock_type, ATM only KVM_CLOCK_PAIRING_WALLCLOCK (0)
is supported (corresponding to the host's CLOCK_REALTIME clock).
struct kvm_clock_pairing {
__s64 sec;
__s64 nsec;
__u64 tsc;
__u32 flags;
__u32 pad[9];
};
Where:
* sec: seconds from clock_type clock.
* nsec: nanoseconds from clock_type clock.
* tsc: guest TSC value used to calculate sec/nsec pair
* flags: flags, unused (0) at the moment.
The hypercall lets a guest compute a precise timestamp across
host and guest. The guest can use the returned TSC value to
compute the CLOCK_REALTIME for its clock, at the same instant.
Returns KVM_EOPNOTSUPP if the host does not use TSC clocksource,
or if clock type is different than KVM_CLOCK_PAIRING_WALLCLOCK.

31
Documentation/virtual/kvm/locking.txt
View File

@ -26,9 +26,16 @@ sections.
Fast page fault:
Fast page fault is the fast path which fixes the guest page fault out of
the mmu-lock on x86. Currently, the page fault can be fast only if the
shadow page table is present and it is caused by write-protect, that means
we just need change the W bit of the spte.
the mmu-lock on x86. Currently, the page fault can be fast in one of the
following two cases:
1. Access Tracking: The SPTE is not present, but it is marked for access
tracking i.e. the SPTE_SPECIAL_MASK is set. That means we need to
restore the saved R/X bits. This is described in more detail later below.
2. Write-Protection: The SPTE is present and the fault is
caused by write-protect. That means we just need to change the W bit of the
spte.
What we use to avoid all the race is the SPTE_HOST_WRITEABLE bit and
SPTE_MMU_WRITEABLE bit on the spte:
@ -38,7 +45,8 @@ SPTE_MMU_WRITEABLE bit on the spte:
page write-protection.
On fast page fault path, we will use cmpxchg to atomically set the spte W
bit if spte.SPTE_HOST_WRITEABLE = 1 and spte.SPTE_WRITE_PROTECT = 1, this
bit if spte.SPTE_HOST_WRITEABLE = 1 and spte.SPTE_WRITE_PROTECT = 1, or
restore the saved R/X bits if VMX_EPT_TRACK_ACCESS mask is set, or both. This
is safe because whenever changing these bits can be detected by cmpxchg.
But we need carefully check these cases:
@ -142,6 +150,21 @@ Since the spte is "volatile" if it can be updated out of mmu-lock, we always
atomically update the spte, the race caused by fast page fault can be avoided,
See the comments in spte_has_volatile_bits() and mmu_spte_update().
Lockless Access Tracking:
This is used for Intel CPUs that are using EPT but do not support the EPT A/D
bits. In this case, when the KVM MMU notifier is called to track accesses to a
page (via kvm_mmu_notifier_clear_flush_young), it marks the PTE as not-present
by clearing the RWX bits in the PTE and storing the original R & X bits in
some unused/ignored bits. In addition, the SPTE_SPECIAL_MASK is also set on the
PTE (using the ignored bit 62). When the VM tries to access the page later on,
a fault is generated and the fast page fault mechanism described above is used
to atomically restore the PTE to a Present state. The W bit is not saved when
the PTE is marked for access tracking and during restoration to the Present
state, the W bit is set depending on whether or not it was a write access. If
it wasn't, then the W bit will remain clear until a write access happens, at
which time it will be set using the Dirty tracking mechanism described above.
3. Reference
------------

3
arch/arm/include/asm/kvm_host.h
View File

@ -60,9 +60,6 @@ struct kvm_arch {
/* The last vcpu id that ran on each physical CPU */
int __percpu *last_vcpu_ran;
/* Timer */
struct arch_timer_kvm timer;
/*
* Anything that is not used directly from assembly code goes
* here.

12
arch/arm/include/asm/kvm_mmu.h
View File

@ -129,8 +129,7 @@ static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu)
static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu,
kvm_pfn_t pfn,
unsigned long size,
bool ipa_uncached)
unsigned long size)
{
/*
* If we are going to insert an instruction page and the icache is
@ -150,18 +149,12 @@ static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu,
* and iterate over the range.
*/
bool need_flush = !vcpu_has_cache_enabled(vcpu) || ipa_uncached;
VM_BUG_ON(size & ~PAGE_MASK);
if (!need_flush && !icache_is_pipt())
goto vipt_cache;
while (size) {
void *va = kmap_atomic_pfn(pfn);
if (need_flush)
kvm_flush_dcache_to_poc(va, PAGE_SIZE);
kvm_flush_dcache_to_poc(va, PAGE_SIZE);
if (icache_is_pipt())
__cpuc_coherent_user_range((unsigned long)va,
@ -173,7 +166,6 @@ static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu,
kunmap_atomic(va);
}
vipt_cache:
if (!icache_is_pipt() && !icache_is_vivt_asid_tagged()) {
/* any kind of VIPT cache */
__flush_icache_all();

13
arch/arm/include/uapi/asm/kvm.h
View File

@ -181,10 +181,23 @@ struct kvm_arch_memory_slot {
#define KVM_DEV_ARM_VGIC_GRP_CPU_REGS 2
#define KVM_DEV_ARM_VGIC_CPUID_SHIFT 32
#define KVM_DEV_ARM_VGIC_CPUID_MASK (0xffULL << KVM_DEV_ARM_VGIC_CPUID_SHIFT)
#define KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT 32
#define KVM_DEV_ARM_VGIC_V3_MPIDR_MASK \
(0xffffffffULL << KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT)
#define KVM_DEV_ARM_VGIC_OFFSET_SHIFT 0
#define KVM_DEV_ARM_VGIC_OFFSET_MASK (0xffffffffULL << KVM_DEV_ARM_VGIC_OFFSET_SHIFT)
#define KVM_DEV_ARM_VGIC_SYSREG_INSTR_MASK (0xffff)
#define KVM_DEV_ARM_VGIC_GRP_NR_IRQS 3
#define KVM_DEV_ARM_VGIC_GRP_CTRL 4
#define KVM_DEV_ARM_VGIC_GRP_REDIST_REGS 5
#define KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS 6
#define KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO 7
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT 10
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK \
(0x3fffffULL << KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT)
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INTID_MASK 0x3ff
#define VGIC_LEVEL_INFO_LINE_LEVEL 0
#define KVM_DEV_ARM_VGIC_CTRL_INIT 0
/* KVM_IRQ_LINE irq field index values */

5
arch/arm/kvm/Makefile
View File

@ -7,7 +7,7 @@ ifeq ($(plus_virt),+virt)
plus_virt_def := -DREQUIRES_VIRT=1
endif
ccflags-y += -Iarch/arm/kvm
ccflags-y += -Iarch/arm/kvm -Ivirt/kvm/arm/vgic
CFLAGS_arm.o := -I. $(plus_virt_def)
CFLAGS_mmu.o := -I.
@ -20,7 +20,7 @@ kvm-arm-y = $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o $(KVM)/vf
obj-$(CONFIG_KVM_ARM_HOST) += hyp/
obj-y += kvm-arm.o init.o interrupts.o
obj-y += arm.o handle_exit.o guest.o mmu.o emulate.o reset.o
obj-y += coproc.o coproc_a15.o coproc_a7.o mmio.o psci.o perf.o
obj-y += coproc.o coproc_a15.o coproc_a7.o mmio.o psci.o perf.o vgic-v3-coproc.o
obj-y += $(KVM)/arm/aarch32.o
obj-y += $(KVM)/arm/vgic/vgic.o
@ -33,5 +33,6 @@ obj-y += $(KVM)/arm/vgic/vgic-mmio-v2.o
obj-y += $(KVM)/arm/vgic/vgic-mmio-v3.o
obj-y += $(KVM)/arm/vgic/vgic-kvm-device.o
obj-y += $(KVM)/arm/vgic/vgic-its.o
obj-y += $(KVM)/arm/vgic/vgic-debug.o
obj-y += $(KVM)/irqchip.o
obj-y += $(KVM)/arm/arch_timer.o

8
arch/arm/kvm/arm.c
View File

@ -135,7 +135,6 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
goto out_free_stage2_pgd;
kvm_vgic_early_init(kvm);
kvm_timer_init(kvm);
/* Mark the initial VMID generation invalid */
kvm->arch.vmid_gen = 0;
@ -207,6 +206,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_ARM_PSCI_0_2:
case KVM_CAP_READONLY_MEM:
case KVM_CAP_MP_STATE:
case KVM_CAP_IMMEDIATE_EXIT:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:
@ -301,7 +301,8 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
return kvm_timer_should_fire(vcpu);
return kvm_timer_should_fire(vcpu_vtimer(vcpu)) ||
kvm_timer_should_fire(vcpu_ptimer(vcpu));
}
void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
@ -604,6 +605,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
return ret;
}
if (run->immediate_exit)
return -EINTR;
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);

20
arch/arm/kvm/mmu.c
View File

@ -1232,9 +1232,9 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
}
static void coherent_cache_guest_page(struct kvm_vcpu *vcpu, kvm_pfn_t pfn,
unsigned long size, bool uncached)
unsigned long size)
{
__coherent_cache_guest_page(vcpu, pfn, size, uncached);
__coherent_cache_guest_page(vcpu, pfn, size);
}
static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
@ -1250,7 +1250,6 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
struct vm_area_struct *vma;
kvm_pfn_t pfn;
pgprot_t mem_type = PAGE_S2;
bool fault_ipa_uncached;
bool logging_active = memslot_is_logging(memslot);
unsigned long flags = 0;
@ -1337,8 +1336,6 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
if (!hugetlb && !force_pte)
hugetlb = transparent_hugepage_adjust(&pfn, &fault_ipa);
fault_ipa_uncached = memslot->flags & KVM_MEMSLOT_INCOHERENT;
if (hugetlb) {
pmd_t new_pmd = pfn_pmd(pfn, mem_type);
new_pmd = pmd_mkhuge(new_pmd);
@ -1346,7 +1343,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
new_pmd = kvm_s2pmd_mkwrite(new_pmd);
kvm_set_pfn_dirty(pfn);
}
coherent_cache_guest_page(vcpu, pfn, PMD_SIZE, fault_ipa_uncached);
coherent_cache_guest_page(vcpu, pfn, PMD_SIZE);
ret = stage2_set_pmd_huge(kvm, memcache, fault_ipa, &new_pmd);
} else {
pte_t new_pte = pfn_pte(pfn, mem_type);
@ -1356,7 +1353,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
kvm_set_pfn_dirty(pfn);
mark_page_dirty(kvm, gfn);
}
coherent_cache_guest_page(vcpu, pfn, PAGE_SIZE, fault_ipa_uncached);
coherent_cache_guest_page(vcpu, pfn, PAGE_SIZE);
ret = stage2_set_pte(kvm, memcache, fault_ipa, &new_pte, flags);
}
@ -1879,15 +1876,6 @@ void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
unsigned long npages)
{
/*
* Readonly memslots are not incoherent with the caches by definition,
* but in practice, they are used mostly to emulate ROMs or NOR flashes
* that the guest may consider devices and hence map as uncached.
* To prevent incoherency issues in these cases, tag all readonly
* regions as incoherent.
*/
if (slot->flags & KVM_MEM_READONLY)
slot->flags |= KVM_MEMSLOT_INCOHERENT;
return 0;
}

9
arch/arm/kvm/reset.c
View File

@ -37,6 +37,11 @@ static struct kvm_regs cortexa_regs_reset = {
.usr_regs.ARM_cpsr = SVC_MODE | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT,
};
static const struct kvm_irq_level cortexa_ptimer_irq = {
{ .irq = 30 },
.level = 1,
};
static const struct kvm_irq_level cortexa_vtimer_irq = {
{ .irq = 27 },
.level = 1,
@ -58,6 +63,7 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
{
struct kvm_regs *reset_regs;
const struct kvm_irq_level *cpu_vtimer_irq;
const struct kvm_irq_level *cpu_ptimer_irq;
switch (vcpu->arch.target) {
case KVM_ARM_TARGET_CORTEX_A7:
@ -65,6 +71,7 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
reset_regs = &cortexa_regs_reset;
vcpu->arch.midr = read_cpuid_id();
cpu_vtimer_irq = &cortexa_vtimer_irq;
cpu_ptimer_irq = &cortexa_ptimer_irq;
break;
default:
return -ENODEV;
@ -77,5 +84,5 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
kvm_reset_coprocs(vcpu);
/* Reset arch_timer context */
return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq, cpu_ptimer_irq);
}

35
arch/arm/kvm/vgic-v3-coproc.c Normal file
View File

@ -0,0 +1,35 @@
/*
* VGIC system registers handling functions for AArch32 mode
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <asm/kvm_emulate.h>
#include "vgic.h"
int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, bool is_write, u64 id,
u64 *reg)
{
/*
* TODO: Implement for AArch32
*/
return -ENXIO;
}
int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu, bool is_write, u64 id,
u64 *reg)
{
/*
* TODO: Implement for AArch32
*/
return -ENXIO;
}

3
arch/arm64/include/asm/kvm_host.h
View File

@ -70,9 +70,6 @@ struct kvm_arch {
/* Interrupt controller */
struct vgic_dist vgic;
/* Timer */
struct arch_timer_kvm timer;
};
#define KVM_NR_MEM_OBJS 40

6
arch/arm64/include/asm/kvm_mmu.h
View File

@ -236,13 +236,11 @@ static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu)
static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu,
kvm_pfn_t pfn,
unsigned long size,
bool ipa_uncached)
unsigned long size)
{
void *va = page_address(pfn_to_page(pfn));
if (!vcpu_has_cache_enabled(vcpu) || ipa_uncached)
kvm_flush_dcache_to_poc(va, size);
kvm_flush_dcache_to_poc(va, size);
if (!icache_is_aliasing()) { /* PIPT */
flush_icache_range((unsigned long)va,

13
arch/arm64/include/uapi/asm/kvm.h
View File

@ -201,10 +201,23 @@ struct kvm_arch_memory_slot {
#define KVM_DEV_ARM_VGIC_GRP_CPU_REGS 2
#define KVM_DEV_ARM_VGIC_CPUID_SHIFT 32
#define KVM_DEV_ARM_VGIC_CPUID_MASK (0xffULL << KVM_DEV_ARM_VGIC_CPUID_SHIFT)
#define KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT 32
#define KVM_DEV_ARM_VGIC_V3_MPIDR_MASK \
(0xffffffffULL << KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT)
#define KVM_DEV_ARM_VGIC_OFFSET_SHIFT 0
#define KVM_DEV_ARM_VGIC_OFFSET_MASK (0xffffffffULL << KVM_DEV_ARM_VGIC_OFFSET_SHIFT)
#define KVM_DEV_ARM_VGIC_SYSREG_INSTR_MASK (0xffff)
#define KVM_DEV_ARM_VGIC_GRP_NR_IRQS 3
#define KVM_DEV_ARM_VGIC_GRP_CTRL 4
#define KVM_DEV_ARM_VGIC_GRP_REDIST_REGS 5
#define KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS 6
#define KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO 7
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT 10
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK \
(0x3fffffULL << KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT)
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INTID_MASK 0x3ff
#define VGIC_LEVEL_INFO_LINE_LEVEL 0
#define KVM_DEV_ARM_VGIC_CTRL_INIT 0
/* Device Control API on vcpu fd */

4
arch/arm64/kvm/Makefile
View File

@ -2,7 +2,7 @@
# Makefile for Kernel-based Virtual Machine module
#
ccflags-y += -Iarch/arm64/kvm
ccflags-y += -Iarch/arm64/kvm -Ivirt/kvm/arm/vgic
CFLAGS_arm.o := -I.
CFLAGS_mmu.o := -I.
@ -19,6 +19,7 @@ kvm-$(CONFIG_KVM_ARM_HOST) += $(ARM)/psci.o $(ARM)/perf.o
kvm-$(CONFIG_KVM_ARM_HOST) += inject_fault.o regmap.o
kvm-$(CONFIG_KVM_ARM_HOST) += hyp.o hyp-init.o handle_exit.o
kvm-$(CONFIG_KVM_ARM_HOST) += guest.o debug.o reset.o sys_regs.o sys_regs_generic_v8.o
kvm-$(CONFIG_KVM_ARM_HOST) += vgic-sys-reg-v3.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/aarch32.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic.o
@ -31,6 +32,7 @@ kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-mmio-v2.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-mmio-v3.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-kvm-device.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-its.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-debug.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/irqchip.o
kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/arch_timer.o
kvm-$(CONFIG_KVM_ARM_PMU) += $(KVM)/arm/pmu.o

9
arch/arm64/kvm/reset.c
View File

@ -46,6 +46,11 @@ static const struct kvm_regs default_regs_reset32 = {
COMPAT_PSR_I_BIT | COMPAT_PSR_F_BIT),
};
static const struct kvm_irq_level default_ptimer_irq = {
.irq = 30,
.level = 1,
};
static const struct kvm_irq_level default_vtimer_irq = {
.irq = 27,
.level = 1,
@ -104,6 +109,7 @@ int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
{
const struct kvm_irq_level *cpu_vtimer_irq;
const struct kvm_irq_level *cpu_ptimer_irq;
const struct kvm_regs *cpu_reset;
switch (vcpu->arch.target) {
@ -117,6 +123,7 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
}
cpu_vtimer_irq = &default_vtimer_irq;
cpu_ptimer_irq = &default_ptimer_irq;
break;
}
@ -130,5 +137,5 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
kvm_pmu_vcpu_reset(vcpu);
/* Reset timer */
return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq, cpu_ptimer_irq);
}

92
arch/arm64/kvm/sys_regs.c
View File

@ -820,6 +820,61 @@ static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
CRm((0b1100 | (((n) >> 3) & 0x3))), Op2(((n) & 0x7)), \
access_pmu_evtyper, reset_unknown, (PMEVTYPER0_EL0 + n), }
static bool access_cntp_tval(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
u64 now = kvm_phys_timer_read();
if (p->is_write)
ptimer->cnt_cval = p->regval + now;
else
p->regval = ptimer->cnt_cval - now;
return true;
}
static bool access_cntp_ctl(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
if (p->is_write) {
/* ISTATUS bit is read-only */
ptimer->cnt_ctl = p->regval & ~ARCH_TIMER_CTRL_IT_STAT;
} else {
u64 now = kvm_phys_timer_read();
p->regval = ptimer->cnt_ctl;
/*
* Set ISTATUS bit if it's expired.
* Note that according to ARMv8 ARM Issue A.k, ISTATUS bit is
* UNKNOWN when ENABLE bit is 0, so we chose to set ISTATUS bit
* regardless of ENABLE bit for our implementation convenience.
*/
if (ptimer->cnt_cval <= now)
p->regval |= ARCH_TIMER_CTRL_IT_STAT;
}
return true;
}
static bool access_cntp_cval(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
if (p->is_write)
ptimer->cnt_cval = p->regval;
else
p->regval = ptimer->cnt_cval;
return true;
}
/*
* Architected system registers.
* Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2
@ -1029,6 +1084,16 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ Op0(0b11), Op1(0b011), CRn(0b1101), CRm(0b0000), Op2(0b011),
NULL, reset_unknown, TPIDRRO_EL0 },
/* CNTP_TVAL_EL0 */
{ Op0(0b11), Op1(0b011), CRn(0b1110), CRm(0b0010), Op2(0b000),
access_cntp_tval },
/* CNTP_CTL_EL0 */
{ Op0(0b11), Op1(0b011), CRn(0b1110), CRm(0b0010), Op2(0b001),
access_cntp_ctl },
/* CNTP_CVAL_EL0 */
{ Op0(0b11), Op1(0b011), CRn(0b1110), CRm(0b0010), Op2(0b010),
access_cntp_cval },
/* PMEVCNTRn_EL0 */
PMU_PMEVCNTR_EL0(0),
PMU_PMEVCNTR_EL0(1),
@ -1795,6 +1860,17 @@ static bool index_to_params(u64 id, struct sys_reg_params *params)
}
}
const struct sys_reg_desc *find_reg_by_id(u64 id,
struct sys_reg_params *params,
const struct sys_reg_desc table[],
unsigned int num)
{
if (!index_to_params(id, params))
return NULL;
return find_reg(params, table, num);
}
/* Decode an index value, and find the sys_reg_desc entry. */
static const struct sys_reg_desc *index_to_sys_reg_desc(struct kvm_vcpu *vcpu,
u64 id)
@ -1807,11 +1883,8 @@ static const struct sys_reg_desc *index_to_sys_reg_desc(struct kvm_vcpu *vcpu,
if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG)
return NULL;
if (!index_to_params(id, &params))
return NULL;
table = get_target_table(vcpu->arch.target, true, &num);
r = find_reg(&params, table, num);
r = find_reg_by_id(id, &params, table, num);
if (!r)
r = find_reg(&params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
@ -1918,10 +1991,8 @@ static int get_invariant_sys_reg(u64 id, void __user *uaddr)
struct sys_reg_params params;
const struct sys_reg_desc *r;
if (!index_to_params(id, &params))
return -ENOENT;
r = find_reg(&params, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs));
r = find_reg_by_id(id, &params, invariant_sys_regs,
ARRAY_SIZE(invariant_sys_regs));
if (!r)
return -ENOENT;
@ -1935,9 +2006,8 @@ static int set_invariant_sys_reg(u64 id, void __user *uaddr)
int err;
u64 val = 0; /* Make sure high bits are 0 for 32-bit regs */
if (!index_to_params(id, &params))
return -ENOENT;
r = find_reg(&params, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs));
r = find_reg_by_id(id, &params, invariant_sys_regs,
ARRAY_SIZE(invariant_sys_regs));
if (!r)
return -ENOENT;

4
arch/arm64/kvm/sys_regs.h
View File

@ -136,6 +136,10 @@ static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
return i1->Op2 - i2->Op2;
}
const struct sys_reg_desc *find_reg_by_id(u64 id,
struct sys_reg_params *params,
const struct sys_reg_desc table[],
unsigned int num);
#define Op0(_x) .Op0 = _x
#define Op1(_x) .Op1 = _x

346
arch/arm64/kvm/vgic-sys-reg-v3.c Normal file
View File

@ -0,0 +1,346 @@
/*
* VGIC system registers handling functions for AArch64 mode
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/irqchip/arm-gic-v3.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <asm/kvm_emulate.h>
#include "vgic.h"
#include "sys_regs.h"
static bool access_gic_ctlr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
u32 host_pri_bits, host_id_bits, host_seis, host_a3v, seis, a3v;
struct vgic_cpu *vgic_v3_cpu = &vcpu->arch.vgic_cpu;
struct vgic_vmcr vmcr;
u64 val;
vgic_get_vmcr(vcpu, &vmcr);
if (p->is_write) {
val = p->regval;
/*
* Disallow restoring VM state if not supported by this
* hardware.
*/
host_pri_bits = ((val & ICC_CTLR_EL1_PRI_BITS_MASK) >>
ICC_CTLR_EL1_PRI_BITS_SHIFT) + 1;
if (host_pri_bits > vgic_v3_cpu->num_pri_bits)
return false;
vgic_v3_cpu->num_pri_bits = host_pri_bits;
host_id_bits = (val & ICC_CTLR_EL1_ID_BITS_MASK) >>
ICC_CTLR_EL1_ID_BITS_SHIFT;
if (host_id_bits > vgic_v3_cpu->num_id_bits)
return false;
vgic_v3_cpu->num_id_bits = host_id_bits;
host_seis = ((kvm_vgic_global_state.ich_vtr_el2 &
ICH_VTR_SEIS_MASK) >> ICH_VTR_SEIS_SHIFT);
seis = (val & ICC_CTLR_EL1_SEIS_MASK) >>
ICC_CTLR_EL1_SEIS_SHIFT;
if (host_seis != seis)
return false;
host_a3v = ((kvm_vgic_global_state.ich_vtr_el2 &
ICH_VTR_A3V_MASK) >> ICH_VTR_A3V_SHIFT);
a3v = (val & ICC_CTLR_EL1_A3V_MASK) >> ICC_CTLR_EL1_A3V_SHIFT;
if (host_a3v != a3v)
return false;
/*
* Here set VMCR.CTLR in ICC_CTLR_EL1 layout.
* The vgic_set_vmcr() will convert to ICH_VMCR layout.
*/
vmcr.ctlr = val & ICC_CTLR_EL1_CBPR_MASK;
vmcr.ctlr |= val & ICC_CTLR_EL1_EOImode_MASK;
vgic_set_vmcr(vcpu, &vmcr);
} else {
val = 0;
val |= (vgic_v3_cpu->num_pri_bits - 1) <<
ICC_CTLR_EL1_PRI_BITS_SHIFT;
val |= vgic_v3_cpu->num_id_bits << ICC_CTLR_EL1_ID_BITS_SHIFT;
val |= ((kvm_vgic_global_state.ich_vtr_el2 &
ICH_VTR_SEIS_MASK) >> ICH_VTR_SEIS_SHIFT) <<
ICC_CTLR_EL1_SEIS_SHIFT;
val |= ((kvm_vgic_global_state.ich_vtr_el2 &
ICH_VTR_A3V_MASK) >> ICH_VTR_A3V_SHIFT) <<
ICC_CTLR_EL1_A3V_SHIFT;
/*
* The VMCR.CTLR value is in ICC_CTLR_EL1 layout.
* Extract it directly using ICC_CTLR_EL1 reg definitions.
*/
val |= vmcr.ctlr & ICC_CTLR_EL1_CBPR_MASK;
val |= vmcr.ctlr & ICC_CTLR_EL1_EOImode_MASK;
p->regval = val;
}
return true;
}
static bool access_gic_pmr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
if (p->is_write) {
vmcr.pmr = (p->regval & ICC_PMR_EL1_MASK) >> ICC_PMR_EL1_SHIFT;
vgic_set_vmcr(vcpu, &vmcr);
} else {
p->regval = (vmcr.pmr << ICC_PMR_EL1_SHIFT) & ICC_PMR_EL1_MASK;
}
return true;
}
static bool access_gic_bpr0(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
if (p->is_write) {
vmcr.bpr = (p->regval & ICC_BPR0_EL1_MASK) >>
ICC_BPR0_EL1_SHIFT;
vgic_set_vmcr(vcpu, &vmcr);
} else {
p->regval = (vmcr.bpr << ICC_BPR0_EL1_SHIFT) &
ICC_BPR0_EL1_MASK;
}
return true;
}
static bool access_gic_bpr1(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
struct vgic_vmcr vmcr;
if (!p->is_write)
p->regval = 0;
vgic_get_vmcr(vcpu, &vmcr);
if (!((vmcr.ctlr & ICH_VMCR_CBPR_MASK) >> ICH_VMCR_CBPR_SHIFT)) {
if (p->is_write) {
vmcr.abpr = (p->regval & ICC_BPR1_EL1_MASK) >>
ICC_BPR1_EL1_SHIFT;
vgic_set_vmcr(vcpu, &vmcr);
} else {
p->regval = (vmcr.abpr << ICC_BPR1_EL1_SHIFT) &
ICC_BPR1_EL1_MASK;
}
} else {
if (!p->is_write)
p->regval = min((vmcr.bpr + 1), 7U);
}
return true;
}
static bool access_gic_grpen0(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
if (p->is_write) {
vmcr.grpen0 = (p->regval & ICC_IGRPEN0_EL1_MASK) >>
ICC_IGRPEN0_EL1_SHIFT;
vgic_set_vmcr(vcpu, &vmcr);
} else {
p->regval = (vmcr.grpen0 << ICC_IGRPEN0_EL1_SHIFT) &
ICC_IGRPEN0_EL1_MASK;
}
return true;
}
static bool access_gic_grpen1(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
struct vgic_vmcr vmcr;
vgic_get_vmcr(vcpu, &vmcr);
if (p->is_write) {
vmcr.grpen1 = (p->regval & ICC_IGRPEN1_EL1_MASK) >>
ICC_IGRPEN1_EL1_SHIFT;
vgic_set_vmcr(vcpu, &vmcr);
} else {
p->regval = (vmcr.grpen1 << ICC_IGRPEN1_EL1_SHIFT) &
ICC_IGRPEN1_EL1_MASK;
}
return true;
}
static void vgic_v3_access_apr_reg(struct kvm_vcpu *vcpu,
struct sys_reg_params *p, u8 apr, u8 idx)
{
struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
uint32_t *ap_reg;
if (apr)
ap_reg = &vgicv3->vgic_ap1r[idx];
else
ap_reg = &vgicv3->vgic_ap0r[idx];
if (p->is_write)
*ap_reg = p->regval;
else
p->regval = *ap_reg;
}
static bool access_gic_aprn(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r, u8 apr)
{
struct vgic_cpu *vgic_v3_cpu = &vcpu->arch.vgic_cpu;
u8 idx = r->Op2 & 3;
/*
* num_pri_bits are initialized with HW supported values.
* We can rely safely on num_pri_bits even if VM has not
* restored ICC_CTLR_EL1 before restoring APnR registers.
*/
switch (vgic_v3_cpu->num_pri_bits) {
case 7:
vgic_v3_access_apr_reg(vcpu, p, apr, idx);
break;
case 6:
if (idx > 1)
goto err;
vgic_v3_access_apr_reg(vcpu, p, apr, idx);
break;
default:
if (idx > 0)
goto err;
vgic_v3_access_apr_reg(vcpu, p, apr, idx);
}
return true;
err:
if (!p->is_write)
p->regval = 0;
return false;
}
static bool access_gic_ap0r(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
return access_gic_aprn(vcpu, p, r, 0);
}
static bool access_gic_ap1r(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
return access_gic_aprn(vcpu, p, r, 1);
}
static bool access_gic_sre(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
/* Validate SRE bit */
if (p->is_write) {
if (!(p->regval & ICC_SRE_EL1_SRE))
return false;
} else {
p->regval = vgicv3->vgic_sre;
}
return true;
}
static const struct sys_reg_desc gic_v3_icc_reg_descs[] = {
/* ICC_PMR_EL1 */
{ Op0(3), Op1(0), CRn(4), CRm(6), Op2(0), access_gic_pmr },
/* ICC_BPR0_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(8), Op2(3), access_gic_bpr0 },
/* ICC_AP0R0_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(8), Op2(4), access_gic_ap0r },
/* ICC_AP0R1_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(8), Op2(5), access_gic_ap0r },
/* ICC_AP0R2_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(8), Op2(6), access_gic_ap0r },
/* ICC_AP0R3_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(8), Op2(7), access_gic_ap0r },
/* ICC_AP1R0_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(9), Op2(0), access_gic_ap1r },
/* ICC_AP1R1_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(9), Op2(1), access_gic_ap1r },
/* ICC_AP1R2_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(9), Op2(2), access_gic_ap1r },
/* ICC_AP1R3_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(9), Op2(3), access_gic_ap1r },
/* ICC_BPR1_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(12), Op2(3), access_gic_bpr1 },
/* ICC_CTLR_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(12), Op2(4), access_gic_ctlr },
/* ICC_SRE_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(12), Op2(5), access_gic_sre },
/* ICC_IGRPEN0_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(12), Op2(6), access_gic_grpen0 },
/* ICC_GRPEN1_EL1 */
{ Op0(3), Op1(0), CRn(12), CRm(12), Op2(7), access_gic_grpen1 },
};
int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, bool is_write, u64 id,
u64 *reg)
{
struct sys_reg_params params;
u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64;
params.regval = *reg;
params.is_write = is_write;
params.is_aarch32 = false;
params.is_32bit = false;
if (find_reg_by_id(sysreg, &params, gic_v3_icc_reg_descs,
ARRAY_SIZE(gic_v3_icc_reg_descs)))
return 0;
return -ENXIO;
}
int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu, bool is_write, u64 id,
u64 *reg)
{
struct sys_reg_params params;
const struct sys_reg_desc *r;
u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64;
if (is_write)
params.regval = *reg;
params.is_write = is_write;
params.is_aarch32 = false;
params.is_32bit = false;
r = find_reg_by_id(sysreg, &params, gic_v3_icc_reg_descs,
ARRAY_SIZE(gic_v3_icc_reg_descs));
if (!r)
return -ENXIO;
if (!r->access(vcpu, &params, r))
return -EINVAL;
if (!is_write)
*reg = params.regval;
return 0;
}

183
arch/mips/include/asm/kvm_host.h
View File

@ -43,6 +43,7 @@
#define KVM_REG_MIPS_CP0_ENTRYHI MIPS_CP0_64(10, 0)
#define KVM_REG_MIPS_CP0_COMPARE MIPS_CP0_32(11, 0)
#define KVM_REG_MIPS_CP0_STATUS MIPS_CP0_32(12, 0)
#define KVM_REG_MIPS_CP0_INTCTL MIPS_CP0_32(12, 1)
#define KVM_REG_MIPS_CP0_CAUSE MIPS_CP0_32(13, 0)
#define KVM_REG_MIPS_CP0_EPC MIPS_CP0_64(14, 0)
#define KVM_REG_MIPS_CP0_PRID MIPS_CP0_32(15, 0)
@ -64,7 +65,7 @@
#define KVM_REG_MIPS_CP0_KSCRATCH6 MIPS_CP0_64(31, 7)
#define KVM_MAX_VCPUS 1
#define KVM_MAX_VCPUS 8
#define KVM_USER_MEM_SLOTS 8
/* memory slots that does not exposed to userspace */
#define KVM_PRIVATE_MEM_SLOTS 0
@ -88,6 +89,7 @@
#define KVM_GUEST_KUSEG 0x00000000UL
#define KVM_GUEST_KSEG0 0x40000000UL
#define KVM_GUEST_KSEG1 0x40000000UL
#define KVM_GUEST_KSEG23 0x60000000UL
#define KVM_GUEST_KSEGX(a) ((_ACAST32_(a)) & 0xe0000000)
#define KVM_GUEST_CPHYSADDR(a) ((_ACAST32_(a)) & 0x1fffffff)
@ -104,7 +106,6 @@
#define KVM_GUEST_KSEG23ADDR(a) (KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG23)
#define KVM_INVALID_PAGE 0xdeadbeef
#define KVM_INVALID_INST 0xdeadbeef
#define KVM_INVALID_ADDR 0xdeadbeef
/*
@ -121,8 +122,6 @@ static inline bool kvm_is_error_hva(unsigned long addr)
return IS_ERR_VALUE(addr);
}
extern atomic_t kvm_mips_instance;
struct kvm_vm_stat {
ulong remote_tlb_flush;
};
@ -156,12 +155,8 @@ struct kvm_arch_memory_slot {
};
struct kvm_arch {
/* Guest GVA->HPA page table */
unsigned long *guest_pmap;
unsigned long guest_pmap_npages;
/* Wired host TLB used for the commpage */
int commpage_tlb;
/* Guest physical mm */
struct mm_struct gpa_mm;
};
#define N_MIPS_COPROC_REGS 32
@ -233,6 +228,7 @@ enum emulation_result {
EMULATE_FAIL, /* can't emulate this instruction */
EMULATE_WAIT, /* WAIT instruction */
EMULATE_PRIV_FAIL,
EMULATE_EXCEPT, /* A guest exception has been generated */
};
#define mips3_paddr_to_tlbpfn(x) \
@ -250,6 +246,7 @@ enum emulation_result {
#define TLB_ASID(x) ((x).tlb_hi & KVM_ENTRYHI_ASID)
#define TLB_LO_IDX(x, va) (((va) >> PAGE_SHIFT) & 1)
#define TLB_IS_VALID(x, va) ((x).tlb_lo[TLB_LO_IDX(x, va)] & ENTRYLO_V)
#define TLB_IS_DIRTY(x, va) ((x).tlb_lo[TLB_LO_IDX(x, va)] & ENTRYLO_D)
#define TLB_HI_VPN2_HIT(x, y) ((TLB_VPN2(x) & ~(x).tlb_mask) == \
((y) & VPN2_MASK & ~(x).tlb_mask))
#define TLB_HI_ASID_HIT(x, y) (TLB_IS_GLOBAL(x) || \
@ -261,6 +258,17 @@ struct kvm_mips_tlb {
long tlb_lo[2];
};
#define KVM_NR_MEM_OBJS 4
/*
* We don't want allocation failures within the mmu code, so we preallocate
* enough memory for a single page fault in a cache.
*/
struct kvm_mmu_memory_cache {
int nobjs;
void *objects[KVM_NR_MEM_OBJS];
};
#define KVM_MIPS_AUX_FPU 0x1
#define KVM_MIPS_AUX_MSA 0x2
@ -275,6 +283,8 @@ struct kvm_vcpu_arch {
unsigned long host_cp0_badvaddr;
unsigned long host_cp0_epc;
u32 host_cp0_cause;
u32 host_cp0_badinstr;
u32 host_cp0_badinstrp;
/* GPRS */
unsigned long gprs[32];
@ -318,20 +328,18 @@ struct kvm_vcpu_arch {
/* Bitmask of pending exceptions to be cleared */
unsigned long pending_exceptions_clr;
/* Save/Restore the entryhi register when are are preempted/scheduled back in */
unsigned long preempt_entryhi;
/* S/W Based TLB for guest */
struct kvm_mips_tlb guest_tlb[KVM_MIPS_GUEST_TLB_SIZE];
/* Cached guest kernel/user ASIDs */
u32 guest_user_asid[NR_CPUS];
u32 guest_kernel_asid[NR_CPUS];
/* Guest kernel/user [partial] mm */
struct mm_struct guest_kernel_mm, guest_user_mm;
/* Guest ASID of last user mode execution */
unsigned int last_user_gasid;
/* Cache some mmu pages needed inside spinlock regions */
struct kvm_mmu_memory_cache mmu_page_cache;
int last_sched_cpu;
/* WAIT executed */
@ -339,14 +347,15 @@ struct kvm_vcpu_arch {
u8 fpu_enabled;
u8 msa_enabled;
u8 kscratch_enabled;
};
#define kvm_read_c0_guest_index(cop0) (cop0->reg[MIPS_CP0_TLB_INDEX][0])
#define kvm_write_c0_guest_index(cop0, val) (cop0->reg[MIPS_CP0_TLB_INDEX][0] = val)
#define kvm_read_c0_guest_entrylo0(cop0) (cop0->reg[MIPS_CP0_TLB_LO0][0])
#define kvm_write_c0_guest_entrylo0(cop0, val) (cop0->reg[MIPS_CP0_TLB_LO0][0] = (val))
#define kvm_read_c0_guest_entrylo1(cop0) (cop0->reg[MIPS_CP0_TLB_LO1][0])
#define kvm_write_c0_guest_entrylo1(cop0, val) (cop0->reg[MIPS_CP0_TLB_LO1][0] = (val))
#define kvm_read_c0_guest_context(cop0) (cop0->reg[MIPS_CP0_TLB_CONTEXT][0])
#define kvm_write_c0_guest_context(cop0, val) (cop0->reg[MIPS_CP0_TLB_CONTEXT][0] = (val))
#define kvm_read_c0_guest_userlocal(cop0) (cop0->reg[MIPS_CP0_TLB_CONTEXT][2])
@ -522,9 +531,17 @@ struct kvm_mips_callbacks {
int (*handle_msa_fpe)(struct kvm_vcpu *vcpu);
int (*handle_fpe)(struct kvm_vcpu *vcpu);
int (*handle_msa_disabled)(struct kvm_vcpu *vcpu);
int (*vm_init)(struct kvm *kvm);
int (*vcpu_init)(struct kvm_vcpu *vcpu);
void (*vcpu_uninit)(struct kvm_vcpu *vcpu);
int (*vcpu_setup)(struct kvm_vcpu *vcpu);
void (*flush_shadow_all)(struct kvm *kvm);
/*
* Must take care of flushing any cached GPA PTEs (e.g. guest entries in
* VZ root TLB, or T&E GVA page tables and corresponding root TLB
* mappings).
*/
void (*flush_shadow_memslot)(struct kvm *kvm,
const struct kvm_memory_slot *slot);
gpa_t (*gva_to_gpa)(gva_t gva);
void (*queue_timer_int)(struct kvm_vcpu *vcpu);
void (*dequeue_timer_int)(struct kvm_vcpu *vcpu);
@ -542,8 +559,10 @@ struct kvm_mips_callbacks {
const struct kvm_one_reg *reg, s64 *v);
int (*set_one_reg)(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg, s64 v);
int (*vcpu_get_regs)(struct kvm_vcpu *vcpu);
int (*vcpu_set_regs)(struct kvm_vcpu *vcpu);
int (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
int (*vcpu_put)(struct kvm_vcpu *vcpu, int cpu);
int (*vcpu_run)(struct kvm_run *run, struct kvm_vcpu *vcpu);
void (*vcpu_reenter)(struct kvm_run *run, struct kvm_vcpu *vcpu);
};
extern struct kvm_mips_callbacks *kvm_mips_callbacks;
int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks);
@ -556,6 +575,7 @@ extern int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu);
/* Building of entry/exception code */
int kvm_mips_entry_setup(void);
void *kvm_mips_build_vcpu_run(void *addr);
void *kvm_mips_build_tlb_refill_exception(void *addr, void *handler);
void *kvm_mips_build_exception(void *addr, void *handler);
void *kvm_mips_build_exit(void *addr);
@ -580,54 +600,125 @@ u32 kvm_get_user_asid(struct kvm_vcpu *vcpu);
u32 kvm_get_commpage_asid (struct kvm_vcpu *vcpu);
extern int kvm_mips_handle_kseg0_tlb_fault(unsigned long badbaddr,
struct kvm_vcpu *vcpu);
struct kvm_vcpu *vcpu,
bool write_fault);
extern int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
struct kvm_vcpu *vcpu);
extern int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
struct kvm_mips_tlb *tlb);
struct kvm_mips_tlb *tlb,
unsigned long gva,
bool write_fault);
extern enum emulation_result kvm_mips_handle_tlbmiss(u32 cause,
u32 *opc,
struct kvm_run *run,
struct kvm_vcpu *vcpu);
extern enum emulation_result kvm_mips_handle_tlbmod(u32 cause,
u32 *opc,
struct kvm_run *run,
struct kvm_vcpu *vcpu);
struct kvm_vcpu *vcpu,
bool write_fault);
extern void kvm_mips_dump_host_tlbs(void);
extern void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu);
extern int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi,
unsigned long entrylo0,
unsigned long entrylo1,
int flush_dcache_mask);
extern void kvm_mips_flush_host_tlb(int skip_kseg0);
extern int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long entryhi);
extern int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long entryhi,
bool user, bool kernel);
extern int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu,
unsigned long entryhi);
extern int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr);
extern unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu,
unsigned long gva);
extern void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,
struct kvm_vcpu *vcpu);
extern void kvm_local_flush_tlb_all(void);
extern void kvm_mips_alloc_new_mmu_context(struct kvm_vcpu *vcpu);
extern void kvm_mips_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
extern void kvm_mips_vcpu_put(struct kvm_vcpu *vcpu);
void kvm_mips_suspend_mm(int cpu);
void kvm_mips_resume_mm(int cpu);
/* MMU handling */
/**
* enum kvm_mips_flush - Types of MMU flushes.
* @KMF_USER: Flush guest user virtual memory mappings.
* Guest USeg only.
* @KMF_KERN: Flush guest kernel virtual memory mappings.
* Guest USeg and KSeg2/3.
* @KMF_GPA: Flush guest physical memory mappings.
* Also includes KSeg0 if KMF_KERN is set.
*/
enum kvm_mips_flush {
KMF_USER = 0x0,
KMF_KERN = 0x1,
KMF_GPA = 0x2,
};
void kvm_mips_flush_gva_pt(pgd_t *pgd, enum kvm_mips_flush flags);
bool kvm_mips_flush_gpa_pt(struct kvm *kvm, gfn_t start_gfn, gfn_t end_gfn);
int kvm_mips_mkclean_gpa_pt(struct kvm *kvm, gfn_t start_gfn, gfn_t end_gfn);
pgd_t *kvm_pgd_alloc(void);
void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu);
void kvm_trap_emul_invalidate_gva(struct kvm_vcpu *vcpu, unsigned long addr,
bool user);
void kvm_trap_emul_gva_lockless_begin(struct kvm_vcpu *vcpu);
void kvm_trap_emul_gva_lockless_end(struct kvm_vcpu *vcpu);
enum kvm_mips_fault_result {
KVM_MIPS_MAPPED = 0,
KVM_MIPS_GVA,
KVM_MIPS_GPA,
KVM_MIPS_TLB,
KVM_MIPS_TLBINV,
KVM_MIPS_TLBMOD,
};
enum kvm_mips_fault_result kvm_trap_emul_gva_fault(struct kvm_vcpu *vcpu,
unsigned long gva,
bool write);
#define KVM_ARCH_WANT_MMU_NOTIFIER
int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
int kvm_unmap_hva_range(struct kvm *kvm,
unsigned long start, unsigned long end);
void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
unsigned long address)
{
}
/* Emulation */
u32 kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu);
int kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu, u32 *out);
enum emulation_result update_pc(struct kvm_vcpu *vcpu, u32 cause);
int kvm_get_badinstr(u32 *opc, struct kvm_vcpu *vcpu, u32 *out);
int kvm_get_badinstrp(u32 *opc, struct kvm_vcpu *vcpu, u32 *out);
/**
* kvm_is_ifetch_fault() - Find whether a TLBL exception is due to ifetch fault.
* @vcpu: Virtual CPU.
*
* Returns: Whether the TLBL exception was likely due to an instruction
* fetch fault rather than a data load fault.
*/
static inline bool kvm_is_ifetch_fault(struct kvm_vcpu_arch *vcpu)
{
unsigned long badvaddr = vcpu->host_cp0_badvaddr;
unsigned long epc = msk_isa16_mode(vcpu->pc);
u32 cause = vcpu->host_cp0_cause;
if (epc == badvaddr)
return true;
/*
* Branches may be 32-bit or 16-bit instructions.
* This isn't exact, but we don't really support MIPS16 or microMIPS yet
* in KVM anyway.
*/
if ((cause & CAUSEF_BD) && badvaddr - epc <= 4)
return true;
return false;
}
extern enum emulation_result kvm_mips_emulate_inst(u32 cause,
u32 *opc,
struct kvm_run *run,
struct kvm_vcpu *vcpu);
long kvm_mips_guest_exception_base(struct kvm_vcpu *vcpu);
extern enum emulation_result kvm_mips_emulate_syscall(u32 cause,
u32 *opc,
struct kvm_run *run,
@ -761,10 +852,6 @@ static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_free_memslot(struct kvm *kvm,
struct kvm_memory_slot *free, struct kvm_memory_slot *dont) {}
static inline void kvm_arch_memslots_updated(struct kvm *kvm, struct kvm_memslots *slots) {}
static inline void kvm_arch_flush_shadow_all(struct kvm *kvm) {}
static inline void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
struct kvm_memory_slot *slot) {}
static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}

9
arch/mips/include/asm/mmu_context.h
View File

@ -29,9 +29,11 @@ do { \
} \
} while (0)
extern void tlbmiss_handler_setup_pgd(unsigned long);
/* Note: This is also implemented with uasm in arch/mips/kvm/entry.c */
#define TLBMISS_HANDLER_SETUP_PGD(pgd) \
do { \
extern void tlbmiss_handler_setup_pgd(unsigned long); \
tlbmiss_handler_setup_pgd((unsigned long)(pgd)); \
htw_set_pwbase((unsigned long)pgd); \
} while (0)
@ -97,17 +99,12 @@ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
static inline void
get_new_mmu_context(struct mm_struct *mm, unsigned long cpu)
{
extern void kvm_local_flush_tlb_all(void);
unsigned long asid = asid_cache(cpu);
if (!((asid += cpu_asid_inc()) & cpu_asid_mask(&cpu_data[cpu]))) {
if (cpu_has_vtag_icache)
flush_icache_all();
#ifdef CONFIG_KVM
kvm_local_flush_tlb_all(); /* start new asid cycle */
#else
local_flush_tlb_all(); /* start new asid cycle */
#endif
if (!asid) /* fix version if needed */
asid = asid_first_version(cpu);
}

2
arch/mips/include/uapi/asm/kvm.h
View File

@ -19,6 +19,8 @@
* Some parts derived from the x86 version of this file.
*/
#define __KVM_HAVE_READONLY_MEM
/*
* for KVM_GET_REGS and KVM_SET_REGS
*

2
arch/mips/kvm/Kconfig
View File

@ -20,7 +20,9 @@ config KVM
select EXPORT_UASM
select PREEMPT_NOTIFIERS
select ANON_INODES
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select KVM_MMIO
select MMU_NOTIFIER
select SRCU
---help---
Support for hosting Guest kernels.

50
arch/mips/kvm/dyntrans.c
View File

@ -13,6 +13,7 @@
#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/kvm_host.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/bootmem.h>
@ -29,28 +30,37 @@
static int kvm_mips_trans_replace(struct kvm_vcpu *vcpu, u32 *opc,
union mips_instruction replace)
{
unsigned long paddr, flags;
void *vaddr;
unsigned long vaddr = (unsigned long)opc;
int err;
if (KVM_GUEST_KSEGX((unsigned long)opc) == KVM_GUEST_KSEG0) {
paddr = kvm_mips_translate_guest_kseg0_to_hpa(vcpu,
(unsigned long)opc);
vaddr = kmap_atomic(pfn_to_page(PHYS_PFN(paddr)));
vaddr += paddr & ~PAGE_MASK;
memcpy(vaddr, (void *)&replace, sizeof(u32));
local_flush_icache_range((unsigned long)vaddr,
(unsigned long)vaddr + 32);
kunmap_atomic(vaddr);
} else if (KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) {
local_irq_save(flags);
memcpy((void *)opc, (void *)&replace, sizeof(u32));
__local_flush_icache_user_range((unsigned long)opc,
(unsigned long)opc + 32);
local_irq_restore(flags);
} else {
kvm_err("%s: Invalid address: %p\n", __func__, opc);
return -EFAULT;
retry:
/* The GVA page table is still active so use the Linux TLB handlers */
kvm_trap_emul_gva_lockless_begin(vcpu);
err = put_user(replace.word, opc);
kvm_trap_emul_gva_lockless_end(vcpu);
if (unlikely(err)) {
/*
* We write protect clean pages in GVA page table so normal
* Linux TLB mod handler doesn't silently dirty the page.
* Its also possible we raced with a GVA invalidation.
* Try to force the page to become dirty.
*/
err = kvm_trap_emul_gva_fault(vcpu, vaddr, true);
if (unlikely(err)) {
kvm_info("%s: Address unwriteable: %p\n",
__func__, opc);
return -EFAULT;
}
/*
* Try again. This will likely trigger a TLB refill, which will
* fetch the new dirty entry from the GVA page table, which
* should then succeed.
*/
goto retry;
}
__local_flush_icache_user_range(vaddr, vaddr + 4);
return 0;
}

432
arch/mips/kvm/emulate.c
View File

@ -38,23 +38,25 @@
* Compute the return address and do emulate branch simulation, if required.
* This function should be called only in branch delay slot active.
*/
unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu,
unsigned long instpc)
static int kvm_compute_return_epc(struct kvm_vcpu *vcpu, unsigned long instpc,
unsigned long *out)
{
unsigned int dspcontrol;
union mips_instruction insn;
struct kvm_vcpu_arch *arch = &vcpu->arch;
long epc = instpc;
long nextpc = KVM_INVALID_INST;
long nextpc;
int err;
if (epc & 3)
goto unaligned;
if (epc & 3) {
kvm_err("%s: unaligned epc\n", __func__);
return -EINVAL;
}
/* Read the instruction */
insn.word = kvm_get_inst((u32 *) epc, vcpu);
if (insn.word == KVM_INVALID_INST)
return KVM_INVALID_INST;
err = kvm_get_badinstrp((u32 *)epc, vcpu, &insn.word);
if (err)
return err;
switch (insn.i_format.opcode) {
/* jr and jalr are in r_format format. */
@ -66,6 +68,8 @@ unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu,
case jr_op:
nextpc = arch->gprs[insn.r_format.rs];
break;
default:
return -EINVAL;
}
break;
@ -114,8 +118,11 @@ unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu,
nextpc = epc;
break;
case bposge32_op:
if (!cpu_has_dsp)
goto sigill;
if (!cpu_has_dsp) {
kvm_err("%s: DSP branch but not DSP ASE\n",
__func__);
return -EINVAL;
}
dspcontrol = rddsp(0x01);
@ -125,6 +132,8 @@ unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu,
epc += 8;
nextpc = epc;
break;
default:
return -EINVAL;
}
break;
@ -189,7 +198,7 @@ unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu,
/* And now the FPA/cp1 branch instructions. */
case cop1_op:
kvm_err("%s: unsupported cop1_op\n", __func__);
break;
return -EINVAL;
#ifdef CONFIG_CPU_MIPSR6
/* R6 added the following compact branches with forbidden slots */
@ -198,19 +207,19 @@ unsigned long kvm_compute_return_epc(struct kvm_vcpu *vcpu,
/* only rt == 0 isn't compact branch */
if (insn.i_format.rt != 0)
goto compact_branch;
break;
return -EINVAL;
case pop10_op:
case pop30_op:
/* only rs == rt == 0 is reserved, rest are compact branches */
if (insn.i_format.rs != 0 || insn.i_format.rt != 0)
goto compact_branch;
break;
return -EINVAL;
case pop66_op:
case pop76_op:
/* only rs == 0 isn't compact branch */
if (insn.i_format.rs != 0)
goto compact_branch;
break;
return -EINVAL;
compact_branch:
/*
* If we've hit an exception on the forbidden slot, then
@ -221,42 +230,74 @@ compact_branch:
break;
#else
compact_branch:
/* Compact branches not supported before R6 */
break;
/* Fall through - Compact branches not supported before R6 */
#endif
default:
return -EINVAL;
}
return nextpc;
unaligned:
kvm_err("%s: unaligned epc\n", __func__);
return nextpc;
sigill:
kvm_err("%s: DSP branch but not DSP ASE\n", __func__);
return nextpc;
*out = nextpc;
return 0;
}
enum emulation_result update_pc(struct kvm_vcpu *vcpu, u32 cause)
{
unsigned long branch_pc;
enum emulation_result er = EMULATE_DONE;
int err;
if (cause & CAUSEF_BD) {
branch_pc = kvm_compute_return_epc(vcpu, vcpu->arch.pc);
if (branch_pc == KVM_INVALID_INST) {
er = EMULATE_FAIL;
} else {
vcpu->arch.pc = branch_pc;
kvm_debug("BD update_pc(): New PC: %#lx\n",
vcpu->arch.pc);
}
} else
err = kvm_compute_return_epc(vcpu, vcpu->arch.pc,
&vcpu->arch.pc);
if (err)
return EMULATE_FAIL;
} else {
vcpu->arch.pc += 4;
}
kvm_debug("update_pc(): New PC: %#lx\n", vcpu->arch.pc);
return er;
return EMULATE_DONE;
}
/**
* kvm_get_badinstr() - Get bad instruction encoding.
* @opc: Guest pointer to faulting instruction.
* @vcpu: KVM VCPU information.
*
* Gets the instruction encoding of the faulting instruction, using the saved
* BadInstr register value if it exists, otherwise falling back to reading guest
* memory at @opc.
*
* Returns: The instruction encoding of the faulting instruction.
*/
int kvm_get_badinstr(u32 *opc, struct kvm_vcpu *vcpu, u32 *out)
{
if (cpu_has_badinstr) {
*out = vcpu->arch.host_cp0_badinstr;
return 0;
} else {
return kvm_get_inst(opc, vcpu, out);
}
}
/**
* kvm_get_badinstrp() - Get bad prior instruction encoding.
* @opc: Guest pointer to prior faulting instruction.
* @vcpu: KVM VCPU information.
*
* Gets the instruction encoding of the prior faulting instruction (the branch
* containing the delay slot which faulted), using the saved BadInstrP register
* value if it exists, otherwise falling back to reading guest memory at @opc.
*
* Returns: The instruction encoding of the prior faulting instruction.
*/
int kvm_get_badinstrp(u32 *opc, struct kvm_vcpu *vcpu, u32 *out)
{
if (cpu_has_badinstrp) {
*out = vcpu->arch.host_cp0_badinstrp;
return 0;
} else {
return kvm_get_inst(opc, vcpu, out);
}
}
/**
@ -856,22 +897,30 @@ enum emulation_result kvm_mips_emul_tlbr(struct kvm_vcpu *vcpu)
static void kvm_mips_invalidate_guest_tlb(struct kvm_vcpu *vcpu,
struct kvm_mips_tlb *tlb)
{
struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
int cpu, i;
bool user;
/* No need to flush for entries which are already invalid */
if (!((tlb->tlb_lo[0] | tlb->tlb_lo[1]) & ENTRYLO_V))
return;
/* Don't touch host kernel page tables or TLB mappings */
if ((unsigned long)tlb->tlb_hi > 0x7fffffff)
return;
/* User address space doesn't need flushing for KSeg2/3 changes */
user = tlb->tlb_hi < KVM_GUEST_KSEG0;
preempt_disable();
/* Invalidate page table entries */
kvm_trap_emul_invalidate_gva(vcpu, tlb->tlb_hi & VPN2_MASK, user);
/*
* Probe the shadow host TLB for the entry being overwritten, if one
* matches, invalidate it
*/
kvm_mips_host_tlb_inv(vcpu, tlb->tlb_hi);
kvm_mips_host_tlb_inv(vcpu, tlb->tlb_hi, user, true);
/* Invalidate the whole ASID on other CPUs */
cpu = smp_processor_id();
@ -879,8 +928,8 @@ static void kvm_mips_invalidate_guest_tlb(struct kvm_vcpu *vcpu,
if (i == cpu)
continue;
if (user)
vcpu->arch.guest_user_asid[i] = 0;
vcpu->arch.guest_kernel_asid[i] = 0;
cpu_context(i, user_mm) = 0;
cpu_context(i, kern_mm) = 0;
}
preempt_enable();
@ -1017,7 +1066,7 @@ unsigned int kvm_mips_config4_wrmask(struct kvm_vcpu *vcpu)
unsigned int mask = MIPS_CONF_M;
/* KScrExist */
mask |= (unsigned int)vcpu->arch.kscratch_enabled << 16;
mask |= 0xfc << MIPS_CONF4_KSCREXIST_SHIFT;
return mask;
}
@ -1056,6 +1105,7 @@ enum emulation_result kvm_mips_emulate_CP0(union mips_instruction inst,
struct kvm_vcpu *vcpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
enum emulation_result er = EMULATE_DONE;
u32 rt, rd, sel;
unsigned long curr_pc;
@ -1150,14 +1200,13 @@ enum emulation_result kvm_mips_emulate_CP0(union mips_instruction inst,
er = EMULATE_FAIL;
break;
}
#define C0_EBASE_CORE_MASK 0xff
if ((rd == MIPS_CP0_PRID) && (sel == 1)) {
/* Preserve CORE number */
kvm_change_c0_guest_ebase(cop0,
~(C0_EBASE_CORE_MASK),
/*
* Preserve core number, and keep the exception
* base in guest KSeg0.
*/
kvm_change_c0_guest_ebase(cop0, 0x1ffff000,
vcpu->arch.gprs[rt]);
kvm_err("MTCz, cop0->reg[EBASE]: %#lx\n",
kvm_read_c0_guest_ebase(cop0));
} else if (rd == MIPS_CP0_TLB_HI && sel == 0) {
u32 nasid =
vcpu->arch.gprs[rt] & KVM_ENTRYHI_ASID;
@ -1168,6 +1217,17 @@ enum emulation_result kvm_mips_emulate_CP0(union mips_instruction inst,
& KVM_ENTRYHI_ASID,
nasid);
/*
* Flush entries from the GVA page
* tables.
* Guest user page table will get
* flushed lazily on re-entry to guest
* user if the guest ASID actually
* changes.
*/
kvm_mips_flush_gva_pt(kern_mm->pgd,
KMF_KERN);
/*
* Regenerate/invalidate kernel MMU
* context.
@ -1178,13 +1238,10 @@ enum emulation_result kvm_mips_emulate_CP0(union mips_instruction inst,
*/
preempt_disable();
cpu = smp_processor_id();
kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm,
cpu, vcpu);
vcpu->arch.guest_kernel_asid[cpu] =
vcpu->arch.guest_kernel_mm.context.asid[cpu];
get_new_mmu_context(kern_mm, cpu);
for_each_possible_cpu(i)
if (i != cpu)
vcpu->arch.guest_kernel_asid[i] = 0;
cpu_context(i, kern_mm) = 0;
preempt_enable();
}
kvm_write_c0_guest_entryhi(cop0,
@ -1639,12 +1696,56 @@ enum emulation_result kvm_mips_emulate_load(union mips_instruction inst,
return er;
}
static enum emulation_result kvm_mips_guest_cache_op(int (*fn)(unsigned long),
unsigned long curr_pc,
unsigned long addr,
struct kvm_run *run,
struct kvm_vcpu *vcpu,
u32 cause)
{
int err;
for (;;) {
/* Carefully attempt the cache operation */
kvm_trap_emul_gva_lockless_begin(vcpu);
err = fn(addr);
kvm_trap_emul_gva_lockless_end(vcpu);
if (likely(!err))
return EMULATE_DONE;
/*
* Try to handle the fault and retry, maybe we just raced with a
* GVA invalidation.
*/
switch (kvm_trap_emul_gva_fault(vcpu, addr, false)) {
case KVM_MIPS_GVA:
case KVM_MIPS_GPA:
/* bad virtual or physical address */
return EMULATE_FAIL;
case KVM_MIPS_TLB:
/* no matching guest TLB */
vcpu->arch.host_cp0_badvaddr = addr;
vcpu->arch.pc = curr_pc;
kvm_mips_emulate_tlbmiss_ld(cause, NULL, run, vcpu);
return EMULATE_EXCEPT;
case KVM_MIPS_TLBINV:
/* invalid matching guest TLB */
vcpu->arch.host_cp0_badvaddr = addr;
vcpu->arch.pc = curr_pc;
kvm_mips_emulate_tlbinv_ld(cause, NULL, run, vcpu);
return EMULATE_EXCEPT;
default:
break;
};
}
}
enum emulation_result kvm_mips_emulate_cache(union mips_instruction inst,
u32 *opc, u32 cause,
struct kvm_run *run,
struct kvm_vcpu *vcpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
enum emulation_result er = EMULATE_DONE;
u32 cache, op_inst, op, base;
s16 offset;
@ -1701,80 +1802,16 @@ enum emulation_result kvm_mips_emulate_cache(union mips_instruction inst,
goto done;
}
preempt_disable();
if (KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG0) {
if (kvm_mips_host_tlb_lookup(vcpu, va) < 0 &&
kvm_mips_handle_kseg0_tlb_fault(va, vcpu)) {
kvm_err("%s: handling mapped kseg0 tlb fault for %lx, vcpu: %p, ASID: %#lx\n",
__func__, va, vcpu, read_c0_entryhi());
er = EMULATE_FAIL;
preempt_enable();
goto done;
}
} else if ((KVM_GUEST_KSEGX(va) < KVM_GUEST_KSEG0) ||
KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG23) {
int index;
/* If an entry already exists then skip */
if (kvm_mips_host_tlb_lookup(vcpu, va) >= 0)
goto skip_fault;
/*
* If address not in the guest TLB, then give the guest a fault,
* the resulting handler will do the right thing
*/
index = kvm_mips_guest_tlb_lookup(vcpu, (va & VPN2_MASK) |
(kvm_read_c0_guest_entryhi
(cop0) & KVM_ENTRYHI_ASID));
if (index < 0) {
vcpu->arch.host_cp0_badvaddr = va;
vcpu->arch.pc = curr_pc;
er = kvm_mips_emulate_tlbmiss_ld(cause, NULL, run,
vcpu);
preempt_enable();
goto dont_update_pc;
} else {
struct kvm_mips_tlb *tlb = &vcpu->arch.guest_tlb[index];
/*
* Check if the entry is valid, if not then setup a TLB
* invalid exception to the guest
*/
if (!TLB_IS_VALID(*tlb, va)) {
vcpu->arch.host_cp0_badvaddr = va;
vcpu->arch.pc = curr_pc;
er = kvm_mips_emulate_tlbinv_ld(cause, NULL,
run, vcpu);
preempt_enable();
goto dont_update_pc;
}
/*
* We fault an entry from the guest tlb to the
* shadow host TLB
*/
if (kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb)) {
kvm_err("%s: handling mapped seg tlb fault for %lx, index: %u, vcpu: %p, ASID: %#lx\n",
__func__, va, index, vcpu,
read_c0_entryhi());
er = EMULATE_FAIL;
preempt_enable();
goto done;
}
}
} else {
kvm_err("INVALID CACHE INDEX/ADDRESS (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n",
cache, op, base, arch->gprs[base], offset);
er = EMULATE_FAIL;
preempt_enable();
goto done;
}
skip_fault:
/* XXXKYMA: Only a subset of cache ops are supported, used by Linux */
if (op_inst == Hit_Writeback_Inv_D || op_inst == Hit_Invalidate_D) {
flush_dcache_line(va);
/*
* Perform the dcache part of icache synchronisation on the
* guest's behalf.
*/
er = kvm_mips_guest_cache_op(protected_writeback_dcache_line,
curr_pc, va, run, vcpu, cause);
if (er != EMULATE_DONE)
goto done;
#ifdef CONFIG_KVM_MIPS_DYN_TRANS
/*
* Replace the CACHE instruction, with a SYNCI, not the same,
@ -1783,8 +1820,15 @@ skip_fault:
kvm_mips_trans_cache_va(inst, opc, vcpu);
#endif
} else if (op_inst == Hit_Invalidate_I) {
flush_dcache_line(va);
flush_icache_line(va);
/* Perform the icache synchronisation on the guest's behalf */
er = kvm_mips_guest_cache_op(protected_writeback_dcache_line,
curr_pc, va, run, vcpu, cause);
if (er != EMULATE_DONE)
goto done;
er = kvm_mips_guest_cache_op(protected_flush_icache_line,
curr_pc, va, run, vcpu, cause);
if (er != EMULATE_DONE)
goto done;
#ifdef CONFIG_KVM_MIPS_DYN_TRANS
/* Replace the CACHE instruction, with a SYNCI */
@ -1796,17 +1840,13 @@ skip_fault:
er = EMULATE_FAIL;
}
preempt_enable();
done:
/* Rollback PC only if emulation was unsuccessful */
if (er == EMULATE_FAIL)
vcpu->arch.pc = curr_pc;
dont_update_pc:
/*
* This is for exceptions whose emulation updates the PC, so do not
* overwrite the PC under any circumstances
*/
/* Guest exception needs guest to resume */
if (er == EMULATE_EXCEPT)
er = EMULATE_DONE;
return er;
}
@ -1817,12 +1857,14 @@ enum emulation_result kvm_mips_emulate_inst(u32 cause, u32 *opc,
{
union mips_instruction inst;
enum emulation_result er = EMULATE_DONE;
int err;
/* Fetch the instruction. */
if (cause & CAUSEF_BD)
opc += 1;
inst.word = kvm_get_inst(opc, vcpu);
err = kvm_get_badinstr(opc, vcpu, &inst.word);
if (err)
return EMULATE_FAIL;
switch (inst.r_format.opcode) {
case cop0_op:
@ -1874,6 +1916,22 @@ unknown:
return er;
}
/**
* kvm_mips_guest_exception_base() - Find guest exception vector base address.
*
* Returns: The base address of the current guest exception vector, taking
* both Guest.CP0_Status.BEV and Guest.CP0_EBase into account.
*/
long kvm_mips_guest_exception_base(struct kvm_vcpu *vcpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
if (kvm_read_c0_guest_status(cop0) & ST0_BEV)
return KVM_GUEST_CKSEG1ADDR(0x1fc00200);
else
return kvm_read_c0_guest_ebase(cop0) & MIPS_EBASE_BASE;
}
enum emulation_result kvm_mips_emulate_syscall(u32 cause,
u32 *opc,
struct kvm_run *run,
@ -1899,7 +1957,7 @@ enum emulation_result kvm_mips_emulate_syscall(u32 cause,
(EXCCODE_SYS << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
arch->pc = KVM_GUEST_KSEG0 + 0x180;
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver SYSCALL when EXL is already set\n");
@ -1933,13 +1991,13 @@ enum emulation_result kvm_mips_emulate_tlbmiss_ld(u32 cause,
arch->pc);
/* set pc to the exception entry point */
arch->pc = KVM_GUEST_KSEG0 + 0x0;
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x0;
} else {
kvm_debug("[EXL == 1] delivering TLB MISS @ pc %#lx\n",
arch->pc);
arch->pc = KVM_GUEST_KSEG0 + 0x180;
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
}
kvm_change_c0_guest_cause(cop0, (0xff),
@ -1949,8 +2007,6 @@ enum emulation_result kvm_mips_emulate_tlbmiss_ld(u32 cause,
kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr);
/* XXXKYMA: is the context register used by linux??? */
kvm_write_c0_guest_entryhi(cop0, entryhi);
/* Blow away the shadow host TLBs */
kvm_mips_flush_host_tlb(1);
return EMULATE_DONE;
}
@ -1978,16 +2034,14 @@ enum emulation_result kvm_mips_emulate_tlbinv_ld(u32 cause,
kvm_debug("[EXL == 0] delivering TLB INV @ pc %#lx\n",
arch->pc);
/* set pc to the exception entry point */
arch->pc = KVM_GUEST_KSEG0 + 0x180;
} else {
kvm_debug("[EXL == 1] delivering TLB MISS @ pc %#lx\n",
arch->pc);
arch->pc = KVM_GUEST_KSEG0 + 0x180;
}
/* set pc to the exception entry point */
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
kvm_change_c0_guest_cause(cop0, (0xff),
(EXCCODE_TLBL << CAUSEB_EXCCODE));
@ -1995,8 +2049,6 @@ enum emulation_result kvm_mips_emulate_tlbinv_ld(u32 cause,
kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr);
/* XXXKYMA: is the context register used by linux??? */
kvm_write_c0_guest_entryhi(cop0, entryhi);
/* Blow away the shadow host TLBs */
kvm_mips_flush_host_tlb(1);
return EMULATE_DONE;
}
@ -2025,11 +2077,11 @@ enum emulation_result kvm_mips_emulate_tlbmiss_st(u32 cause,
arch->pc);
/* Set PC to the exception entry point */
arch->pc = KVM_GUEST_KSEG0 + 0x0;
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x0;
} else {
kvm_debug("[EXL == 1] Delivering TLB MISS @ pc %#lx\n",
arch->pc);
arch->pc = KVM_GUEST_KSEG0 + 0x180;
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
}
kvm_change_c0_guest_cause(cop0, (0xff),
@ -2039,8 +2091,6 @@ enum emulation_result kvm_mips_emulate_tlbmiss_st(u32 cause,
kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr);
/* XXXKYMA: is the context register used by linux??? */
kvm_write_c0_guest_entryhi(cop0, entryhi);
/* Blow away the shadow host TLBs */
kvm_mips_flush_host_tlb(1);
return EMULATE_DONE;
}
@ -2067,15 +2117,14 @@ enum emulation_result kvm_mips_emulate_tlbinv_st(u32 cause,
kvm_debug("[EXL == 0] Delivering TLB MISS @ pc %#lx\n",
arch->pc);
/* Set PC to the exception entry point */
arch->pc = KVM_GUEST_KSEG0 + 0x180;
} else {
kvm_debug("[EXL == 1] Delivering TLB MISS @ pc %#lx\n",
arch->pc);
arch->pc = KVM_GUEST_KSEG0 + 0x180;
}
/* Set PC to the exception entry point */
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
kvm_change_c0_guest_cause(cop0, (0xff),
(EXCCODE_TLBS << CAUSEB_EXCCODE));
@ -2083,41 +2132,10 @@ enum emulation_result kvm_mips_emulate_tlbinv_st(u32 cause,
kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr);
/* XXXKYMA: is the context register used by linux??? */
kvm_write_c0_guest_entryhi(cop0, entryhi);
/* Blow away the shadow host TLBs */
kvm_mips_flush_host_tlb(1);
return EMULATE_DONE;
}
/* TLBMOD: store into address matching TLB with Dirty bit off */
enum emulation_result kvm_mips_handle_tlbmod(u32 cause, u32 *opc,
struct kvm_run *run,
struct kvm_vcpu *vcpu)
{
enum emulation_result er = EMULATE_DONE;
#ifdef DEBUG
struct mips_coproc *cop0 = vcpu->arch.cop0;
unsigned long entryhi = (vcpu->arch.host_cp0_badvaddr & VPN2_MASK) |
(kvm_read_c0_guest_entryhi(cop0) & KVM_ENTRYHI_ASID);
int index;
/* If address not in the guest TLB, then we are in trouble */
index = kvm_mips_guest_tlb_lookup(vcpu, entryhi);
if (index < 0) {
/* XXXKYMA Invalidate and retry */
kvm_mips_host_tlb_inv(vcpu, vcpu->arch.host_cp0_badvaddr);
kvm_err("%s: host got TLBMOD for %#lx but entry not present in Guest TLB\n",
__func__, entryhi);
kvm_mips_dump_guest_tlbs(vcpu);
kvm_mips_dump_host_tlbs();
return EMULATE_FAIL;
}
#endif
er = kvm_mips_emulate_tlbmod(cause, opc, run, vcpu);
return er;
}
enum emulation_result kvm_mips_emulate_tlbmod(u32 cause,
u32 *opc,
struct kvm_run *run,
@ -2140,14 +2158,13 @@ enum emulation_result kvm_mips_emulate_tlbmod(u32 cause,
kvm_debug("[EXL == 0] Delivering TLB MOD @ pc %#lx\n",
arch->pc);
arch->pc = KVM_GUEST_KSEG0 + 0x180;
} else {
kvm_debug("[EXL == 1] Delivering TLB MOD @ pc %#lx\n",
arch->pc);
arch->pc = KVM_GUEST_KSEG0 + 0x180;
}
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
kvm_change_c0_guest_cause(cop0, (0xff),
(EXCCODE_MOD << CAUSEB_EXCCODE));
@ -2155,8 +2172,6 @@ enum emulation_result kvm_mips_emulate_tlbmod(u32 cause,
kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr);
/* XXXKYMA: is the context register used by linux??? */
kvm_write_c0_guest_entryhi(cop0, entryhi);
/* Blow away the shadow host TLBs */
kvm_mips_flush_host_tlb(1);
return EMULATE_DONE;
}
@ -2181,7 +2196,7 @@ enum emulation_result kvm_mips_emulate_fpu_exc(u32 cause,
}
arch->pc = KVM_GUEST_KSEG0 + 0x180;
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
kvm_change_c0_guest_cause(cop0, (0xff),
(EXCCODE_CPU << CAUSEB_EXCCODE));
@ -2215,7 +2230,7 @@ enum emulation_result kvm_mips_emulate_ri_exc(u32 cause,
(EXCCODE_RI << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
arch->pc = KVM_GUEST_KSEG0 + 0x180;
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver RI when EXL is already set\n");
@ -2250,7 +2265,7 @@ enum emulation_result kvm_mips_emulate_bp_exc(u32 cause,
(EXCCODE_BP << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
arch->pc = KVM_GUEST_KSEG0 + 0x180;
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver BP when EXL is already set\n");
@ -2285,7 +2300,7 @@ enum emulation_result kvm_mips_emulate_trap_exc(u32 cause,
(EXCCODE_TR << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
arch->pc = KVM_GUEST_KSEG0 + 0x180;
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver TRAP when EXL is already set\n");
@ -2320,7 +2335,7 @@ enum emulation_result kvm_mips_emulate_msafpe_exc(u32 cause,
(EXCCODE_MSAFPE << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
arch->pc = KVM_GUEST_KSEG0 + 0x180;
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver MSAFPE when EXL is already set\n");
@ -2355,7 +2370,7 @@ enum emulation_result kvm_mips_emulate_fpe_exc(u32 cause,
(EXCCODE_FPE << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
arch->pc = KVM_GUEST_KSEG0 + 0x180;
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver FPE when EXL is already set\n");
@ -2390,7 +2405,7 @@ enum emulation_result kvm_mips_emulate_msadis_exc(u32 cause,
(EXCCODE_MSADIS << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
arch->pc = KVM_GUEST_KSEG0 + 0x180;
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
} else {
kvm_err("Trying to deliver MSADIS when EXL is already set\n");
@ -2409,6 +2424,7 @@ enum emulation_result kvm_mips_handle_ri(u32 cause, u32 *opc,
enum emulation_result er = EMULATE_DONE;
unsigned long curr_pc;
union mips_instruction inst;
int err;
/*
* Update PC and hold onto current PC in case there is
@ -2422,11 +2438,9 @@ enum emulation_result kvm_mips_handle_ri(u32 cause, u32 *opc,
/* Fetch the instruction. */
if (cause & CAUSEF_BD)
opc += 1;
inst.word = kvm_get_inst(opc, vcpu);
if (inst.word == KVM_INVALID_INST) {
kvm_err("%s: Cannot get inst @ %p\n", __func__, opc);
err = kvm_get_badinstr(opc, vcpu, &inst.word);
if (err) {
kvm_err("%s: Cannot get inst @ %p (%d)\n", __func__, opc, err);
return EMULATE_FAIL;
}
@ -2557,7 +2571,7 @@ static enum emulation_result kvm_mips_emulate_exc(u32 cause,
(exccode << CAUSEB_EXCCODE));
/* Set PC to the exception entry point */
arch->pc = KVM_GUEST_KSEG0 + 0x180;
arch->pc = kvm_mips_guest_exception_base(vcpu) + 0x180;
kvm_write_c0_guest_badvaddr(cop0, vcpu->arch.host_cp0_badvaddr);
kvm_debug("Delivering EXC %d @ pc %#lx, badVaddr: %#lx\n",
@ -2670,7 +2684,8 @@ enum emulation_result kvm_mips_check_privilege(u32 cause,
enum emulation_result kvm_mips_handle_tlbmiss(u32 cause,
u32 *opc,
struct kvm_run *run,
struct kvm_vcpu *vcpu)
struct kvm_vcpu *vcpu,
bool write_fault)
{
enum emulation_result er = EMULATE_DONE;
u32 exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
@ -2726,7 +2741,8 @@ enum emulation_result kvm_mips_handle_tlbmiss(u32 cause,
* OK we have a Guest TLB entry, now inject it into the
* shadow host TLB
*/
if (kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb)) {
if (kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, va,
write_fault)) {
kvm_err("%s: handling mapped seg tlb fault for %lx, index: %u, vcpu: %p, ASID: %#lx\n",
__func__, va, index, vcpu,
read_c0_entryhi());

155
arch/mips/kvm/entry.c
View File

@ -12,8 +12,11 @@
*/
#include <linux/kvm_host.h>
#include <linux/log2.h>
#include <asm/mmu_context.h>
#include <asm/msa.h>
#include <asm/setup.h>
#include <asm/tlbex.h>
#include <asm/uasm.h>
/* Register names */
@ -50,6 +53,8 @@
/* Some CP0 registers */
#define C0_HWRENA 7, 0
#define C0_BADVADDR 8, 0
#define C0_BADINSTR 8, 1
#define C0_BADINSTRP 8, 2
#define C0_ENTRYHI 10, 0
#define C0_STATUS 12, 0
#define C0_CAUSE 13, 0
@ -89,6 +94,21 @@ static void *kvm_mips_build_ret_from_exit(void *addr);
static void *kvm_mips_build_ret_to_guest(void *addr);
static void *kvm_mips_build_ret_to_host(void *addr);
/*
* The version of this function in tlbex.c uses current_cpu_type(), but for KVM
* we assume symmetry.
*/
static int c0_kscratch(void)
{
switch (boot_cpu_type()) {
case CPU_XLP:
case CPU_XLR:
return 22;
default:
return 31;
}
}
/**
* kvm_mips_entry_setup() - Perform global setup for entry code.
*
@ -103,18 +123,21 @@ int kvm_mips_entry_setup(void)
* We prefer to use KScratchN registers if they are available over the
* defaults above, which may not work on all cores.
*/
unsigned int kscratch_mask = cpu_data[0].kscratch_mask & 0xfc;
unsigned int kscratch_mask = cpu_data[0].kscratch_mask;
if (pgd_reg != -1)
kscratch_mask &= ~BIT(pgd_reg);
/* Pick a scratch register for storing VCPU */
if (kscratch_mask) {
scratch_vcpu[0] = 31;
scratch_vcpu[0] = c0_kscratch();
scratch_vcpu[1] = ffs(kscratch_mask) - 1;
kscratch_mask &= ~BIT(scratch_vcpu[1]);
}
/* Pick a scratch register to use as a temp for saving state */
if (kscratch_mask) {
scratch_tmp[0] = 31;
scratch_tmp[0] = c0_kscratch();
scratch_tmp[1] = ffs(kscratch_mask) - 1;
kscratch_mask &= ~BIT(scratch_tmp[1]);
}
@ -130,7 +153,7 @@ static void kvm_mips_build_save_scratch(u32 **p, unsigned int tmp,
UASM_i_SW(p, tmp, offsetof(struct pt_regs, cp0_epc), frame);
/* Save the temp scratch register value in cp0_cause of stack frame */
if (scratch_tmp[0] == 31) {
if (scratch_tmp[0] == c0_kscratch()) {
UASM_i_MFC0(p, tmp, scratch_tmp[0], scratch_tmp[1]);
UASM_i_SW(p, tmp, offsetof(struct pt_regs, cp0_cause), frame);
}
@ -146,7 +169,7 @@ static void kvm_mips_build_restore_scratch(u32 **p, unsigned int tmp,
UASM_i_LW(p, tmp, offsetof(struct pt_regs, cp0_epc), frame);
UASM_i_MTC0(p, tmp, scratch_vcpu[0], scratch_vcpu[1]);
if (scratch_tmp[0] == 31) {
if (scratch_tmp[0] == c0_kscratch()) {
UASM_i_LW(p, tmp, offsetof(struct pt_regs, cp0_cause), frame);
UASM_i_MTC0(p, tmp, scratch_tmp[0], scratch_tmp[1]);
}
@ -286,23 +309,26 @@ static void *kvm_mips_build_enter_guest(void *addr)
uasm_i_andi(&p, T0, T0, KSU_USER | ST0_ERL | ST0_EXL);
uasm_i_xori(&p, T0, T0, KSU_USER);
uasm_il_bnez(&p, &r, T0, label_kernel_asid);
UASM_i_ADDIU(&p, T1, K1,
offsetof(struct kvm_vcpu_arch, guest_kernel_asid));
UASM_i_ADDIU(&p, T1, K1, offsetof(struct kvm_vcpu_arch,
guest_kernel_mm.context.asid));
/* else user */
UASM_i_ADDIU(&p, T1, K1,
offsetof(struct kvm_vcpu_arch, guest_user_asid));
UASM_i_ADDIU(&p, T1, K1, offsetof(struct kvm_vcpu_arch,
guest_user_mm.context.asid));
uasm_l_kernel_asid(&l, p);
/* t1: contains the base of the ASID array, need to get the cpu id */
/* smp_processor_id */
uasm_i_lw(&p, T2, offsetof(struct thread_info, cpu), GP);
/* x4 */
uasm_i_sll(&p, T2, T2, 2);
/* index the ASID array */
uasm_i_sll(&p, T2, T2, ilog2(sizeof(long)));
UASM_i_ADDU(&p, T3, T1, T2);
uasm_i_lw(&p, K0, 0, T3);
UASM_i_LW(&p, K0, 0, T3);
#ifdef CONFIG_MIPS_ASID_BITS_VARIABLE
/* x sizeof(struct cpuinfo_mips)/4 */
uasm_i_addiu(&p, T3, ZERO, sizeof(struct cpuinfo_mips)/4);
/*
* reuse ASID array offset
* cpuinfo_mips is a multiple of sizeof(long)
*/
uasm_i_addiu(&p, T3, ZERO, sizeof(struct cpuinfo_mips)/sizeof(long));
uasm_i_mul(&p, T2, T2, T3);
UASM_i_LA_mostly(&p, AT, (long)&cpu_data[0].asid_mask);
@ -312,7 +338,20 @@ static void *kvm_mips_build_enter_guest(void *addr)
#else
uasm_i_andi(&p, K0, K0, MIPS_ENTRYHI_ASID);
#endif
uasm_i_mtc0(&p, K0, C0_ENTRYHI);
/*
* Set up KVM T&E GVA pgd.
* This does roughly the same as TLBMISS_HANDLER_SETUP_PGD():
* - call tlbmiss_handler_setup_pgd(mm->pgd)
* - but skips write into CP0_PWBase for now
*/
UASM_i_LW(&p, A0, (int)offsetof(struct mm_struct, pgd) -
(int)offsetof(struct mm_struct, context.asid), T1);
UASM_i_LA(&p, T9, (unsigned long)tlbmiss_handler_setup_pgd);
uasm_i_jalr(&p, RA, T9);
uasm_i_mtc0(&p, K0, C0_ENTRYHI);
uasm_i_ehb(&p);
/* Disable RDHWR access */
@ -347,6 +386,80 @@ static void *kvm_mips_build_enter_guest(void *addr)
return p;
}
/**
* kvm_mips_build_tlb_refill_exception() - Assemble TLB refill handler.
* @addr: Address to start writing code.
* @handler: Address of common handler (within range of @addr).
*
* Assemble TLB refill exception fast path handler for guest execution.
*
* Returns: Next address after end of written function.
*/
void *kvm_mips_build_tlb_refill_exception(void *addr, void *handler)
{
u32 *p = addr;
struct uasm_label labels[2];
struct uasm_reloc relocs[2];
struct uasm_label *l = labels;
struct uasm_reloc *r = relocs;
memset(labels, 0, sizeof(labels));
memset(relocs, 0, sizeof(relocs));
/* Save guest k1 into scratch register */
UASM_i_MTC0(&p, K1, scratch_tmp[0], scratch_tmp[1]);
/* Get the VCPU pointer from the VCPU scratch register */
UASM_i_MFC0(&p, K1, scratch_vcpu[0], scratch_vcpu[1]);
/* Save guest k0 into VCPU structure */
UASM_i_SW(&p, K0, offsetof(struct kvm_vcpu, arch.gprs[K0]), K1);
/*
* Some of the common tlbex code uses current_cpu_type(). For KVM we
* assume symmetry and just disable preemption to silence the warning.
*/
preempt_disable();
/*
* Now for the actual refill bit. A lot of this can be common with the
* Linux TLB refill handler, however we don't need to handle so many
* cases. We only need to handle user mode refills, and user mode runs
* with 32-bit addressing.
*
* Therefore the branch to label_vmalloc generated by build_get_pmde64()
* that isn't resolved should never actually get taken and is harmless
* to leave in place for now.
*/
#ifdef CONFIG_64BIT
build_get_pmde64(&p, &l, &r, K0, K1); /* get pmd in K1 */
#else
build_get_pgde32(&p, K0, K1); /* get pgd in K1 */
#endif
/* we don't support huge pages yet */
build_get_ptep(&p, K0, K1);
build_update_entries(&p, K0, K1);
build_tlb_write_entry(&p, &l, &r, tlb_random);
preempt_enable();
/* Get the VCPU pointer from the VCPU scratch register again */
UASM_i_MFC0(&p, K1, scratch_vcpu[0], scratch_vcpu[1]);
/* Restore the guest's k0/k1 registers */
UASM_i_LW(&p, K0, offsetof(struct kvm_vcpu, arch.gprs[K0]), K1);
uasm_i_ehb(&p);
UASM_i_MFC0(&p, K1, scratch_tmp[0], scratch_tmp[1]);
/* Jump to guest */
uasm_i_eret(&p);
return p;
}
/**
* kvm_mips_build_exception() - Assemble first level guest exception handler.
* @addr: Address to start writing code.
@ -468,6 +581,18 @@ void *kvm_mips_build_exit(void *addr)
uasm_i_mfc0(&p, K0, C0_CAUSE);
uasm_i_sw(&p, K0, offsetof(struct kvm_vcpu_arch, host_cp0_cause), K1);
if (cpu_has_badinstr) {
uasm_i_mfc0(&p, K0, C0_BADINSTR);
uasm_i_sw(&p, K0, offsetof(struct kvm_vcpu_arch,
host_cp0_badinstr), K1);
}
if (cpu_has_badinstrp) {
uasm_i_mfc0(&p, K0, C0_BADINSTRP);
uasm_i_sw(&p, K0, offsetof(struct kvm_vcpu_arch,
host_cp0_badinstrp), K1);
}
/* Now restore the host state just enough to run the handlers */
/* Switch EBASE to the one used by Linux */

5
arch/mips/kvm/interrupt.c
View File

@ -183,10 +183,11 @@ int kvm_mips_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority,
(exccode << CAUSEB_EXCCODE));
/* XXXSL Set PC to the interrupt exception entry point */
arch->pc = kvm_mips_guest_exception_base(vcpu);
if (kvm_read_c0_guest_cause(cop0) & CAUSEF_IV)
arch->pc = KVM_GUEST_KSEG0 + 0x200;
arch->pc += 0x200;
else
arch->pc = KVM_GUEST_KSEG0 + 0x180;
arch->pc += 0x180;
clear_bit(priority, &vcpu->arch.pending_exceptions);
}

503
arch/mips/kvm/mips.c
View File

@ -22,6 +22,7 @@
#include <asm/page.h>
#include <asm/cacheflush.h>
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <linux/kvm_host.h>
@ -63,18 +64,6 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{NULL}
};
static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu)
{
int i;
for_each_possible_cpu(i) {
vcpu->arch.guest_kernel_asid[i] = 0;
vcpu->arch.guest_user_asid[i] = 0;
}
return 0;
}
/*
* XXXKYMA: We are simulatoring a processor that has the WII bit set in
* Config7, so we are "runnable" if interrupts are pending
@ -104,39 +93,12 @@ void kvm_arch_check_processor_compat(void *rtn)
*(int *)rtn = 0;
}
static void kvm_mips_init_tlbs(struct kvm *kvm)
{
unsigned long wired;
/*
* Add a wired entry to the TLB, it is used to map the commpage to
* the Guest kernel
*/
wired = read_c0_wired();
write_c0_wired(wired + 1);
mtc0_tlbw_hazard();
kvm->arch.commpage_tlb = wired;
kvm_debug("[%d] commpage TLB: %d\n", smp_processor_id(),
kvm->arch.commpage_tlb);
}
static void kvm_mips_init_vm_percpu(void *arg)
{
struct kvm *kvm = (struct kvm *)arg;
kvm_mips_init_tlbs(kvm);
kvm_mips_callbacks->vm_init(kvm);
}
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
if (atomic_inc_return(&kvm_mips_instance) == 1) {
kvm_debug("%s: 1st KVM instance, setup host TLB parameters\n",
__func__);
on_each_cpu(kvm_mips_init_vm_percpu, kvm, 1);
}
/* Allocate page table to map GPA -> RPA */
kvm->arch.gpa_mm.pgd = kvm_pgd_alloc();
if (!kvm->arch.gpa_mm.pgd)
return -ENOMEM;
return 0;
}
@ -156,13 +118,6 @@ void kvm_mips_free_vcpus(struct kvm *kvm)
unsigned int i;
struct kvm_vcpu *vcpu;
/* Put the pages we reserved for the guest pmap */
for (i = 0; i < kvm->arch.guest_pmap_npages; i++) {
if (kvm->arch.guest_pmap[i] != KVM_INVALID_PAGE)
kvm_release_pfn_clean(kvm->arch.guest_pmap[i]);
}
kfree(kvm->arch.guest_pmap);
kvm_for_each_vcpu(i, vcpu, kvm) {
kvm_arch_vcpu_free(vcpu);
}
@ -177,25 +132,17 @@ void kvm_mips_free_vcpus(struct kvm *kvm)
mutex_unlock(&kvm->lock);
}
static void kvm_mips_uninit_tlbs(void *arg)
static void kvm_mips_free_gpa_pt(struct kvm *kvm)
{
/* Restore wired count */
write_c0_wired(0);
mtc0_tlbw_hazard();
/* Clear out all the TLBs */
kvm_local_flush_tlb_all();
/* It should always be safe to remove after flushing the whole range */
WARN_ON(!kvm_mips_flush_gpa_pt(kvm, 0, ~0));
pgd_free(NULL, kvm->arch.gpa_mm.pgd);
}
void kvm_arch_destroy_vm(struct kvm *kvm)
{
kvm_mips_free_vcpus(kvm);
/* If this is the last instance, restore wired count */
if (atomic_dec_return(&kvm_mips_instance) == 0) {
kvm_debug("%s: last KVM instance, restoring TLB parameters\n",
__func__);
on_each_cpu(kvm_mips_uninit_tlbs, NULL, 1);
}
kvm_mips_free_gpa_pt(kvm);
}
long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl,
@ -210,6 +157,32 @@ int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
return 0;
}
void kvm_arch_flush_shadow_all(struct kvm *kvm)
{
/* Flush whole GPA */
kvm_mips_flush_gpa_pt(kvm, 0, ~0);
/* Let implementation do the rest */
kvm_mips_callbacks->flush_shadow_all(kvm);
}
void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
struct kvm_memory_slot *slot)
{
/*
* The slot has been made invalid (ready for moving or deletion), so we
* need to ensure that it can no longer be accessed by any guest VCPUs.
*/
spin_lock(&kvm->mmu_lock);
/* Flush slot from GPA */
kvm_mips_flush_gpa_pt(kvm, slot->base_gfn,
slot->base_gfn + slot->npages - 1);
/* Let implementation do the rest */
kvm_mips_callbacks->flush_shadow_memslot(kvm, slot);
spin_unlock(&kvm->mmu_lock);
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,
const struct kvm_userspace_memory_region *mem,
@ -224,35 +197,32 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
const struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
unsigned long npages = 0;
int i;
int needs_flush;
kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n",
__func__, kvm, mem->slot, mem->guest_phys_addr,
mem->memory_size, mem->userspace_addr);
/* Setup Guest PMAP table */
if (!kvm->arch.guest_pmap) {
if (mem->slot == 0)
npages = mem->memory_size >> PAGE_SHIFT;
if (npages) {
kvm->arch.guest_pmap_npages = npages;
kvm->arch.guest_pmap =
kzalloc(npages * sizeof(unsigned long), GFP_KERNEL);
if (!kvm->arch.guest_pmap) {
kvm_err("Failed to allocate guest PMAP\n");
return;
}
kvm_debug("Allocated space for Guest PMAP Table (%ld pages) @ %p\n",
npages, kvm->arch.guest_pmap);
/* Now setup the page table */
for (i = 0; i < npages; i++)
kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE;
}
/*
* If dirty page logging is enabled, write protect all pages in the slot
* ready for dirty logging.
*
* There is no need to do this in any of the following cases:
* CREATE: No dirty mappings will already exist.
* MOVE/DELETE: The old mappings will already have been cleaned up by
* kvm_arch_flush_shadow_memslot()
*/
if (change == KVM_MR_FLAGS_ONLY &&
(!(old->flags & KVM_MEM_LOG_DIRTY_PAGES) &&
new->flags & KVM_MEM_LOG_DIRTY_PAGES)) {
spin_lock(&kvm->mmu_lock);
/* Write protect GPA page table entries */
needs_flush = kvm_mips_mkclean_gpa_pt(kvm, new->base_gfn,
new->base_gfn + new->npages - 1);
/* Let implementation do the rest */
if (needs_flush)
kvm_mips_callbacks->flush_shadow_memslot(kvm, new);
spin_unlock(&kvm->mmu_lock);
}
}
@ -276,7 +246,7 @@ static inline void dump_handler(const char *symbol, void *start, void *end)
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
{
int err, size;
void *gebase, *p, *handler;
void *gebase, *p, *handler, *refill_start, *refill_end;
int i;
struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
@ -329,8 +299,9 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
/* Build guest exception vectors dynamically in unmapped memory */
handler = gebase + 0x2000;
/* TLB Refill, EXL = 0 */
kvm_mips_build_exception(gebase, handler);
/* TLB refill */
refill_start = gebase;
refill_end = kvm_mips_build_tlb_refill_exception(refill_start, handler);
/* General Exception Entry point */
kvm_mips_build_exception(gebase + 0x180, handler);
@ -356,6 +327,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
pr_debug("#include <asm/regdef.h>\n");
pr_debug("\n");
dump_handler("kvm_vcpu_run", vcpu->arch.vcpu_run, p);
dump_handler("kvm_tlb_refill", refill_start, refill_end);
dump_handler("kvm_gen_exc", gebase + 0x180, gebase + 0x200);
dump_handler("kvm_exit", gebase + 0x2000, vcpu->arch.vcpu_run);
@ -406,6 +378,7 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
kvm_mips_dump_stats(vcpu);
kvm_mmu_free_memory_caches(vcpu);
kfree(vcpu->arch.guest_ebase);
kfree(vcpu->arch.kseg0_commpage);
kfree(vcpu);
@ -422,37 +395,9 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
return -ENOIOCTLCMD;
}
/* Must be called with preemption disabled, just before entering guest */
static void kvm_mips_check_asids(struct kvm_vcpu *vcpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
int i, cpu = smp_processor_id();
unsigned int gasid;
/*
* Lazy host ASID regeneration for guest user mode.
* If the guest ASID has changed since the last guest usermode
* execution, regenerate the host ASID so as to invalidate stale TLB
* entries.
*/
if (!KVM_GUEST_KERNEL_MODE(vcpu)) {
gasid = kvm_read_c0_guest_entryhi(cop0) & KVM_ENTRYHI_ASID;
if (gasid != vcpu->arch.last_user_gasid) {
kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu,
vcpu);
vcpu->arch.guest_user_asid[cpu] =
vcpu->arch.guest_user_mm.context.asid[cpu];
for_each_possible_cpu(i)
if (i != cpu)
vcpu->arch.guest_user_asid[cpu] = 0;
vcpu->arch.last_user_gasid = gasid;
}
}
}
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
int r = 0;
int r = -EINTR;
sigset_t sigsaved;
if (vcpu->sigset_active)
@ -464,31 +409,30 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
vcpu->mmio_needed = 0;
}
if (run->immediate_exit)
goto out;
lose_fpu(1);
local_irq_disable();
/* Check if we have any exceptions/interrupts pending */
kvm_mips_deliver_interrupts(vcpu,
kvm_read_c0_guest_cause(vcpu->arch.cop0));
guest_enter_irqoff();
/* Disable hardware page table walking while in guest */
htw_stop();
trace_kvm_enter(vcpu);
kvm_mips_check_asids(vcpu);
/*
* Make sure the read of VCPU requests in vcpu_run() callback is not
* reordered ahead of the write to vcpu->mode, or we could miss a TLB
* flush request while the requester sees the VCPU as outside of guest
* mode and not needing an IPI.
*/
smp_store_mb(vcpu->mode, IN_GUEST_MODE);
r = kvm_mips_callbacks->vcpu_run(run, vcpu);
r = vcpu->arch.vcpu_run(run, vcpu);
trace_kvm_out(vcpu);
/* Re-enable HTW before enabling interrupts */
htw_start();
guest_exit_irqoff();
local_irq_enable();
out:
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
@ -580,33 +524,6 @@ static u64 kvm_mips_get_one_regs[] = {
KVM_REG_MIPS_LO,
#endif
KVM_REG_MIPS_PC,
KVM_REG_MIPS_CP0_INDEX,
KVM_REG_MIPS_CP0_CONTEXT,
KVM_REG_MIPS_CP0_USERLOCAL,
KVM_REG_MIPS_CP0_PAGEMASK,
KVM_REG_MIPS_CP0_WIRED,
KVM_REG_MIPS_CP0_HWRENA,
KVM_REG_MIPS_CP0_BADVADDR,
KVM_REG_MIPS_CP0_COUNT,
KVM_REG_MIPS_CP0_ENTRYHI,
KVM_REG_MIPS_CP0_COMPARE,
KVM_REG_MIPS_CP0_STATUS,
KVM_REG_MIPS_CP0_CAUSE,
KVM_REG_MIPS_CP0_EPC,
KVM_REG_MIPS_CP0_PRID,
KVM_REG_MIPS_CP0_CONFIG,
KVM_REG_MIPS_CP0_CONFIG1,
KVM_REG_MIPS_CP0_CONFIG2,
KVM_REG_MIPS_CP0_CONFIG3,
KVM_REG_MIPS_CP0_CONFIG4,
KVM_REG_MIPS_CP0_CONFIG5,
KVM_REG_MIPS_CP0_CONFIG7,
KVM_REG_MIPS_CP0_ERROREPC,
KVM_REG_MIPS_COUNT_CTL,
KVM_REG_MIPS_COUNT_RESUME,
KVM_REG_MIPS_COUNT_HZ,
};
static u64 kvm_mips_get_one_regs_fpu[] = {
@ -619,15 +536,6 @@ static u64 kvm_mips_get_one_regs_msa[] = {
KVM_REG_MIPS_MSA_CSR,
};
static u64 kvm_mips_get_one_regs_kscratch[] = {
KVM_REG_MIPS_CP0_KSCRATCH1,
KVM_REG_MIPS_CP0_KSCRATCH2,
KVM_REG_MIPS_CP0_KSCRATCH3,
KVM_REG_MIPS_CP0_KSCRATCH4,
KVM_REG_MIPS_CP0_KSCRATCH5,
KVM_REG_MIPS_CP0_KSCRATCH6,
};
static unsigned long kvm_mips_num_regs(struct kvm_vcpu *vcpu)
{
unsigned long ret;
@ -641,7 +549,6 @@ static unsigned long kvm_mips_num_regs(struct kvm_vcpu *vcpu)
}
if (kvm_mips_guest_can_have_msa(&vcpu->arch))
ret += ARRAY_SIZE(kvm_mips_get_one_regs_msa) + 32;
ret += __arch_hweight8(vcpu->arch.kscratch_enabled);
ret += kvm_mips_callbacks->num_regs(vcpu);
return ret;
@ -694,16 +601,6 @@ static int kvm_mips_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices)
}
}
for (i = 0; i < 6; ++i) {
if (!(vcpu->arch.kscratch_enabled & BIT(i + 2)))
continue;
if (copy_to_user(indices, &kvm_mips_get_one_regs_kscratch[i],
sizeof(kvm_mips_get_one_regs_kscratch[i])))
return -EFAULT;
++indices;
}
return kvm_mips_callbacks->copy_reg_indices(vcpu, indices);
}
@ -794,95 +691,6 @@ static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
v = fpu->msacsr;
break;
/* Co-processor 0 registers */
case KVM_REG_MIPS_CP0_INDEX:
v = (long)kvm_read_c0_guest_index(cop0);
break;
case KVM_REG_MIPS_CP0_CONTEXT:
v = (long)kvm_read_c0_guest_context(cop0);
break;
case KVM_REG_MIPS_CP0_USERLOCAL:
v = (long)kvm_read_c0_guest_userlocal(cop0);
break;
case KVM_REG_MIPS_CP0_PAGEMASK:
v = (long)kvm_read_c0_guest_pagemask(cop0);
break;
case KVM_REG_MIPS_CP0_WIRED:
v = (long)kvm_read_c0_guest_wired(cop0);
break;
case KVM_REG_MIPS_CP0_HWRENA:
v = (long)kvm_read_c0_guest_hwrena(cop0);
break;
case KVM_REG_MIPS_CP0_BADVADDR:
v = (long)kvm_read_c0_guest_badvaddr(cop0);
break;
case KVM_REG_MIPS_CP0_ENTRYHI:
v = (long)kvm_read_c0_guest_entryhi(cop0);
break;
case KVM_REG_MIPS_CP0_COMPARE:
v = (long)kvm_read_c0_guest_compare(cop0);
break;
case KVM_REG_MIPS_CP0_STATUS:
v = (long)kvm_read_c0_guest_status(cop0);
break;
case KVM_REG_MIPS_CP0_CAUSE:
v = (long)kvm_read_c0_guest_cause(cop0);
break;
case KVM_REG_MIPS_CP0_EPC:
v = (long)kvm_read_c0_guest_epc(cop0);
break;
case KVM_REG_MIPS_CP0_PRID:
v = (long)kvm_read_c0_guest_prid(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG:
v = (long)kvm_read_c0_guest_config(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG1:
v = (long)kvm_read_c0_guest_config1(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG2:
v = (long)kvm_read_c0_guest_config2(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG3:
v = (long)kvm_read_c0_guest_config3(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG4:
v = (long)kvm_read_c0_guest_config4(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG5:
v = (long)kvm_read_c0_guest_config5(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG7:
v = (long)kvm_read_c0_guest_config7(cop0);
break;
case KVM_REG_MIPS_CP0_ERROREPC:
v = (long)kvm_read_c0_guest_errorepc(cop0);
break;
case KVM_REG_MIPS_CP0_KSCRATCH1 ... KVM_REG_MIPS_CP0_KSCRATCH6:
idx = reg->id - KVM_REG_MIPS_CP0_KSCRATCH1 + 2;
if (!(vcpu->arch.kscratch_enabled & BIT(idx)))
return -EINVAL;
switch (idx) {
case 2:
v = (long)kvm_read_c0_guest_kscratch1(cop0);
break;
case 3:
v = (long)kvm_read_c0_guest_kscratch2(cop0);
break;
case 4:
v = (long)kvm_read_c0_guest_kscratch3(cop0);
break;
case 5:
v = (long)kvm_read_c0_guest_kscratch4(cop0);
break;
case 6:
v = (long)kvm_read_c0_guest_kscratch5(cop0);
break;
case 7:
v = (long)kvm_read_c0_guest_kscratch6(cop0);
break;
}
break;
/* registers to be handled specially */
default:
ret = kvm_mips_callbacks->get_one_reg(vcpu, reg, &v);
@ -1014,68 +822,6 @@ static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
fpu->msacsr = v;
break;
/* Co-processor 0 registers */
case KVM_REG_MIPS_CP0_INDEX:
kvm_write_c0_guest_index(cop0, v);
break;
case KVM_REG_MIPS_CP0_CONTEXT:
kvm_write_c0_guest_context(cop0, v);
break;
case KVM_REG_MIPS_CP0_USERLOCAL:
kvm_write_c0_guest_userlocal(cop0, v);
break;
case KVM_REG_MIPS_CP0_PAGEMASK:
kvm_write_c0_guest_pagemask(cop0, v);
break;
case KVM_REG_MIPS_CP0_WIRED:
kvm_write_c0_guest_wired(cop0, v);
break;
case KVM_REG_MIPS_CP0_HWRENA:
kvm_write_c0_guest_hwrena(cop0, v);
break;
case KVM_REG_MIPS_CP0_BADVADDR:
kvm_write_c0_guest_badvaddr(cop0, v);
break;
case KVM_REG_MIPS_CP0_ENTRYHI:
kvm_write_c0_guest_entryhi(cop0, v);
break;
case KVM_REG_MIPS_CP0_STATUS:
kvm_write_c0_guest_status(cop0, v);
break;
case KVM_REG_MIPS_CP0_EPC:
kvm_write_c0_guest_epc(cop0, v);
break;
case KVM_REG_MIPS_CP0_PRID:
kvm_write_c0_guest_prid(cop0, v);
break;
case KVM_REG_MIPS_CP0_ERROREPC:
kvm_write_c0_guest_errorepc(cop0, v);
break;
case KVM_REG_MIPS_CP0_KSCRATCH1 ... KVM_REG_MIPS_CP0_KSCRATCH6:
idx = reg->id - KVM_REG_MIPS_CP0_KSCRATCH1 + 2;
if (!(vcpu->arch.kscratch_enabled & BIT(idx)))
return -EINVAL;
switch (idx) {
case 2:
kvm_write_c0_guest_kscratch1(cop0, v);
break;
case 3:
kvm_write_c0_guest_kscratch2(cop0, v);
break;
case 4:
kvm_write_c0_guest_kscratch3(cop0, v);
break;
case 5:
kvm_write_c0_guest_kscratch4(cop0, v);
break;
case 6:
kvm_write_c0_guest_kscratch5(cop0, v);
break;
case 7:
kvm_write_c0_guest_kscratch6(cop0, v);
break;
}
break;
/* registers to be handled specially */
default:
return kvm_mips_callbacks->set_one_reg(vcpu, reg, v);
@ -1144,18 +890,12 @@ long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
return -E2BIG;
return kvm_mips_copy_reg_indices(vcpu, user_list->reg);
}
case KVM_NMI:
/* Treat the NMI as a CPU reset */
r = kvm_mips_reset_vcpu(vcpu);
break;
case KVM_INTERRUPT:
{
struct kvm_mips_interrupt irq;
r = -EFAULT;
if (copy_from_user(&irq, argp, sizeof(irq)))
goto out;
return -EFAULT;
kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
irq.irq);
@ -1165,56 +905,57 @@ long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
case KVM_ENABLE_CAP: {
struct kvm_enable_cap cap;
r = -EFAULT;
if (copy_from_user(&cap, argp, sizeof(cap)))
goto out;
return -EFAULT;
r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
break;
}
default:
r = -ENOIOCTLCMD;
}
out:
return r;
}
/* Get (and clear) the dirty memory log for a memory slot. */
/**
* kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
* @kvm: kvm instance
* @log: slot id and address to which we copy the log
*
* Steps 1-4 below provide general overview of dirty page logging. See
* kvm_get_dirty_log_protect() function description for additional details.
*
* We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
* always flush the TLB (step 4) even if previous step failed and the dirty
* bitmap may be corrupt. Regardless of previous outcome the KVM logging API
* does not preclude user space subsequent dirty log read. Flushing TLB ensures
* writes will be marked dirty for next log read.
*
* 1. Take a snapshot of the bit and clear it if needed.
* 2. Write protect the corresponding page.
* 3. Copy the snapshot to the userspace.
* 4. Flush TLB's if needed.
*/
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
{
struct kvm_memslots *slots;
struct kvm_memory_slot *memslot;
unsigned long ga, ga_end;
int is_dirty = 0;
bool is_dirty = false;
int r;
unsigned long n;
mutex_lock(&kvm->slots_lock);
r = kvm_get_dirty_log(kvm, log, &is_dirty);
if (r)
goto out;
r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
/* If nothing is dirty, don't bother messing with page tables. */
if (is_dirty) {
slots = kvm_memslots(kvm);
memslot = id_to_memslot(slots, log->slot);
ga = memslot->base_gfn << PAGE_SHIFT;
ga_end = ga + (memslot->npages << PAGE_SHIFT);
kvm_info("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga,
ga_end);
n = kvm_dirty_bitmap_bytes(memslot);
memset(memslot->dirty_bitmap, 0, n);
/* Let implementation handle TLB/GVA invalidation */
kvm_mips_callbacks->flush_shadow_memslot(kvm, memslot);
}
r = 0;
out:
mutex_unlock(&kvm->slots_lock);
return r;
}
long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
@ -1282,11 +1023,20 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
switch (ext) {
case KVM_CAP_ONE_REG:
case KVM_CAP_ENABLE_CAP:
case KVM_CAP_READONLY_MEM:
case KVM_CAP_SYNC_MMU:
case KVM_CAP_IMMEDIATE_EXIT:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:
r = KVM_COALESCED_MMIO_PAGE_OFFSET;
break;
case KVM_CAP_NR_VCPUS:
r = num_online_cpus();
break;
case KVM_CAP_MAX_VCPUS:
r = KVM_MAX_VCPUS;
break;
case KVM_CAP_MIPS_FPU:
/* We don't handle systems with inconsistent cpu_has_fpu */
r = !!raw_cpu_has_fpu;
@ -1400,13 +1150,23 @@ static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
kvm_mips_callbacks->vcpu_init(vcpu);
int err;
err = kvm_mips_callbacks->vcpu_init(vcpu);
if (err)
return err;
hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
HRTIMER_MODE_REL);
vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
return 0;
}
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
kvm_mips_callbacks->vcpu_uninit(vcpu);
}
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
struct kvm_translation *tr)
{
@ -1440,8 +1200,11 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
u32 __user *opc = (u32 __user *) vcpu->arch.pc;
unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
enum emulation_result er = EMULATE_DONE;
u32 inst;
int ret = RESUME_GUEST;
vcpu->mode = OUTSIDE_GUEST_MODE;
/* re-enable HTW before enabling interrupts */
htw_start();
@ -1564,8 +1327,12 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
break;
default:
if (cause & CAUSEF_BD)
opc += 1;
inst = 0;
kvm_get_badinstr(opc, vcpu, &inst);
kvm_err("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#lx\n",
exccode, opc, kvm_get_inst(opc, vcpu), badvaddr,
exccode, opc, inst, badvaddr,
kvm_read_c0_guest_status(vcpu->arch.cop0));
kvm_arch_vcpu_dump_regs(vcpu);
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
@ -1593,7 +1360,15 @@ skip_emul:
if (ret == RESUME_GUEST) {
trace_kvm_reenter(vcpu);
kvm_mips_check_asids(vcpu);
/*
* Make sure the read of VCPU requests in vcpu_reenter()
* callback is not reordered ahead of the write to vcpu->mode,
* or we could miss a TLB flush request while the requester sees
* the VCPU as outside of guest mode and not needing an IPI.
*/
smp_store_mb(vcpu->mode, IN_GUEST_MODE);
kvm_mips_callbacks->vcpu_reenter(run, vcpu);
/*
* If FPU / MSA are enabled (i.e. the guest's FPU / MSA context

1339
arch/mips/kvm/mmu.c
View File

File diff suppressed because it is too large Load Diff

297
arch/mips/kvm/tlb.c
View File

@ -33,28 +33,20 @@
#define KVM_GUEST_PC_TLB 0
#define KVM_GUEST_SP_TLB 1
atomic_t kvm_mips_instance;
EXPORT_SYMBOL_GPL(kvm_mips_instance);
static u32 kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
{
struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
int cpu = smp_processor_id();
return vcpu->arch.guest_kernel_asid[cpu] &
cpu_asid_mask(&cpu_data[cpu]);
return cpu_asid(cpu, kern_mm);
}
static u32 kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
{
struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
int cpu = smp_processor_id();
return vcpu->arch.guest_user_asid[cpu] &
cpu_asid_mask(&cpu_data[cpu]);
}
inline u32 kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu)
{
return vcpu->kvm->arch.commpage_tlb;
return cpu_asid(cpu, user_mm);
}
/* Structure defining an tlb entry data set. */
@ -104,109 +96,6 @@ void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_mips_dump_guest_tlbs);
/* XXXKYMA: Must be called with interrupts disabled */
/* set flush_dcache_mask == 0 if no dcache flush required */
int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi,
unsigned long entrylo0, unsigned long entrylo1,
int flush_dcache_mask)
{
unsigned long flags;
unsigned long old_entryhi;
int idx;
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
write_c0_entryhi(entryhi);
mtc0_tlbw_hazard();
tlb_probe();
tlb_probe_hazard();
idx = read_c0_index();
if (idx > current_cpu_data.tlbsize) {
kvm_err("%s: Invalid Index: %d\n", __func__, idx);
kvm_mips_dump_host_tlbs();
local_irq_restore(flags);
return -1;
}
write_c0_entrylo0(entrylo0);
write_c0_entrylo1(entrylo1);
mtc0_tlbw_hazard();
if (idx < 0)
tlb_write_random();
else
tlb_write_indexed();
tlbw_use_hazard();
kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0(R): 0x%08lx, entrylo1(R): 0x%08lx\n",
vcpu->arch.pc, idx, read_c0_entryhi(),
read_c0_entrylo0(), read_c0_entrylo1());
/* Flush D-cache */
if (flush_dcache_mask) {
if (entrylo0 & ENTRYLO_V) {
++vcpu->stat.flush_dcache_exits;
flush_data_cache_page((entryhi & VPN2_MASK) &
~flush_dcache_mask);
}
if (entrylo1 & ENTRYLO_V) {
++vcpu->stat.flush_dcache_exits;
flush_data_cache_page(((entryhi & VPN2_MASK) &
~flush_dcache_mask) |
(0x1 << PAGE_SHIFT));
}
}
/* Restore old ASID */
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_write);
int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
struct kvm_vcpu *vcpu)
{
kvm_pfn_t pfn;
unsigned long flags, old_entryhi = 0, vaddr = 0;
unsigned long entrylo[2] = { 0, 0 };
unsigned int pair_idx;
pfn = PFN_DOWN(virt_to_phys(vcpu->arch.kseg0_commpage));
pair_idx = (badvaddr >> PAGE_SHIFT) & 1;
entrylo[pair_idx] = mips3_paddr_to_tlbpfn(pfn << PAGE_SHIFT) |
((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) |
ENTRYLO_D | ENTRYLO_V;
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
vaddr = badvaddr & (PAGE_MASK << 1);
write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu));
write_c0_entrylo0(entrylo[0]);
write_c0_entrylo1(entrylo[1]);
write_c0_index(kvm_mips_get_commpage_asid(vcpu));
mtc0_tlbw_hazard();
tlb_write_indexed();
tlbw_use_hazard();
kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n",
vcpu->arch.pc, read_c0_index(), read_c0_entryhi(),
read_c0_entrylo0(), read_c0_entrylo1());
/* Restore old ASID */
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL_GPL(kvm_mips_handle_commpage_tlb_fault);
int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi)
{
int i;
@ -228,51 +117,11 @@ int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi)
}
EXPORT_SYMBOL_GPL(kvm_mips_guest_tlb_lookup);
int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr)
{
unsigned long old_entryhi, flags;
int idx;
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
if (KVM_GUEST_KERNEL_MODE(vcpu))
write_c0_entryhi((vaddr & VPN2_MASK) |
kvm_mips_get_kernel_asid(vcpu));
else {
write_c0_entryhi((vaddr & VPN2_MASK) |
kvm_mips_get_user_asid(vcpu));
}
mtc0_tlbw_hazard();
tlb_probe();
tlb_probe_hazard();
idx = read_c0_index();
/* Restore old ASID */
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
local_irq_restore(flags);
kvm_debug("Host TLB lookup, %#lx, idx: %2d\n", vaddr, idx);
return idx;
}
EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_lookup);
int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va)
static int _kvm_mips_host_tlb_inv(unsigned long entryhi)
{
int idx;
unsigned long flags, old_entryhi;
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
write_c0_entryhi((va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu));
write_c0_entryhi(entryhi);
mtc0_tlbw_hazard();
tlb_probe();
@ -282,7 +131,7 @@ int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va)
if (idx >= current_cpu_data.tlbsize)
BUG();
if (idx > 0) {
if (idx >= 0) {
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
write_c0_entrylo0(0);
write_c0_entrylo1(0);
@ -292,93 +141,75 @@ int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va)
tlbw_use_hazard();
}
return idx;
}
int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va,
bool user, bool kernel)
{
int idx_user, idx_kernel;
unsigned long flags, old_entryhi;
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
if (user)
idx_user = _kvm_mips_host_tlb_inv((va & VPN2_MASK) |
kvm_mips_get_user_asid(vcpu));
if (kernel)
idx_kernel = _kvm_mips_host_tlb_inv((va & VPN2_MASK) |
kvm_mips_get_kernel_asid(vcpu));
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
local_irq_restore(flags);
if (idx > 0)
kvm_debug("%s: Invalidated entryhi %#lx @ idx %d\n", __func__,
(va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu), idx);
if (user && idx_user >= 0)
kvm_debug("%s: Invalidated guest user entryhi %#lx @ idx %d\n",
__func__, (va & VPN2_MASK) |
kvm_mips_get_user_asid(vcpu), idx_user);
if (kernel && idx_kernel >= 0)
kvm_debug("%s: Invalidated guest kernel entryhi %#lx @ idx %d\n",
__func__, (va & VPN2_MASK) |
kvm_mips_get_kernel_asid(vcpu), idx_kernel);
return 0;
}
EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_inv);
void kvm_mips_flush_host_tlb(int skip_kseg0)
/**
* kvm_mips_suspend_mm() - Suspend the active mm.
* @cpu The CPU we're running on.
*
* Suspend the active_mm, ready for a switch to a KVM guest virtual address
* space. This is left active for the duration of guest context, including time
* with interrupts enabled, so we need to be careful not to confuse e.g. cache
* management IPIs.
*
* kvm_mips_resume_mm() should be called before context switching to a different
* process so we don't need to worry about reference counting.
*
* This needs to be in static kernel code to avoid exporting init_mm.
*/
void kvm_mips_suspend_mm(int cpu)
{
unsigned long flags;
unsigned long old_entryhi, entryhi;
unsigned long old_pagemask;
int entry = 0;
int maxentry = current_cpu_data.tlbsize;
local_irq_save(flags);
old_entryhi = read_c0_entryhi();
old_pagemask = read_c0_pagemask();
/* Blast 'em all away. */
for (entry = 0; entry < maxentry; entry++) {
write_c0_index(entry);
if (skip_kseg0) {
mtc0_tlbr_hazard();
tlb_read();
tlb_read_hazard();
entryhi = read_c0_entryhi();
/* Don't blow away guest kernel entries */
if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0)
continue;
write_c0_pagemask(old_pagemask);
}
/* Make sure all entries differ. */
write_c0_entryhi(UNIQUE_ENTRYHI(entry));
write_c0_entrylo0(0);
write_c0_entrylo1(0);
mtc0_tlbw_hazard();
tlb_write_indexed();
tlbw_use_hazard();
}
write_c0_entryhi(old_entryhi);
write_c0_pagemask(old_pagemask);
mtc0_tlbw_hazard();
local_irq_restore(flags);
cpumask_clear_cpu(cpu, mm_cpumask(current->active_mm));
current->active_mm = &init_mm;
}
EXPORT_SYMBOL_GPL(kvm_mips_flush_host_tlb);
EXPORT_SYMBOL_GPL(kvm_mips_suspend_mm);
void kvm_local_flush_tlb_all(void)
/**
* kvm_mips_resume_mm() - Resume the current process mm.
* @cpu The CPU we're running on.
*
* Resume the mm of the current process, after a switch back from a KVM guest
* virtual address space (see kvm_mips_suspend_mm()).
*/
void kvm_mips_resume_mm(int cpu)
{
unsigned long flags;
unsigned long old_ctx;
int entry = 0;
local_irq_save(flags);
/* Save old context and create impossible VPN2 value */
old_ctx = read_c0_entryhi();
write_c0_entrylo0(0);
write_c0_entrylo1(0);
/* Blast 'em all away. */
while (entry < current_cpu_data.tlbsize) {
/* Make sure all entries differ. */
write_c0_entryhi(UNIQUE_ENTRYHI(entry));
write_c0_index(entry);
mtc0_tlbw_hazard();
tlb_write_indexed();
tlbw_use_hazard();
entry++;
}
write_c0_entryhi(old_ctx);
mtc0_tlbw_hazard();
local_irq_restore(flags);
cpumask_set_cpu(cpu, mm_cpumask(current->mm));
current->active_mm = current->mm;
}
EXPORT_SYMBOL_GPL(kvm_local_flush_tlb_all);
EXPORT_SYMBOL_GPL(kvm_mips_resume_mm);

740
arch/mips/kvm/trap_emul.c
View File

@ -11,9 +11,11 @@
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/vmalloc.h>
#include <linux/kvm_host.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>
#include "interrupt.h"
@ -21,9 +23,12 @@ static gpa_t kvm_trap_emul_gva_to_gpa_cb(gva_t gva)
{
gpa_t gpa;
gva_t kseg = KSEGX(gva);
gva_t gkseg = KVM_GUEST_KSEGX(gva);
if ((kseg == CKSEG0) || (kseg == CKSEG1))
gpa = CPHYSADDR(gva);
else if (gkseg == KVM_GUEST_KSEG0)
gpa = KVM_GUEST_CPHYSADDR(gva);
else {
kvm_err("%s: cannot find GPA for GVA: %#lx\n", __func__, gva);
kvm_mips_dump_host_tlbs();
@ -83,48 +88,134 @@ static int kvm_trap_emul_handle_cop_unusable(struct kvm_vcpu *vcpu)
return ret;
}
static int kvm_mips_bad_load(u32 cause, u32 *opc, struct kvm_run *run,
struct kvm_vcpu *vcpu)
{
enum emulation_result er;
union mips_instruction inst;
int err;
/* A code fetch fault doesn't count as an MMIO */
if (kvm_is_ifetch_fault(&vcpu->arch)) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return RESUME_HOST;
}
/* Fetch the instruction. */
if (cause & CAUSEF_BD)
opc += 1;
err = kvm_get_badinstr(opc, vcpu, &inst.word);
if (err) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return RESUME_HOST;
}
/* Emulate the load */
er = kvm_mips_emulate_load(inst, cause, run, vcpu);
if (er == EMULATE_FAIL) {
kvm_err("Emulate load from MMIO space failed\n");
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
} else {
run->exit_reason = KVM_EXIT_MMIO;
}
return RESUME_HOST;
}
static int kvm_mips_bad_store(u32 cause, u32 *opc, struct kvm_run *run,
struct kvm_vcpu *vcpu)
{
enum emulation_result er;
union mips_instruction inst;
int err;
/* Fetch the instruction. */
if (cause & CAUSEF_BD)
opc += 1;
err = kvm_get_badinstr(opc, vcpu, &inst.word);
if (err) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return RESUME_HOST;
}
/* Emulate the store */
er = kvm_mips_emulate_store(inst, cause, run, vcpu);
if (er == EMULATE_FAIL) {
kvm_err("Emulate store to MMIO space failed\n");
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
} else {
run->exit_reason = KVM_EXIT_MMIO;
}
return RESUME_HOST;
}
static int kvm_mips_bad_access(u32 cause, u32 *opc, struct kvm_run *run,
struct kvm_vcpu *vcpu, bool store)
{
if (store)
return kvm_mips_bad_store(cause, opc, run, vcpu);
else
return kvm_mips_bad_load(cause, opc, run, vcpu);
}
static int kvm_trap_emul_handle_tlb_mod(struct kvm_vcpu *vcpu)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
struct kvm_run *run = vcpu->run;
u32 __user *opc = (u32 __user *) vcpu->arch.pc;
unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
u32 cause = vcpu->arch.host_cp0_cause;
enum emulation_result er = EMULATE_DONE;
int ret = RESUME_GUEST;
struct kvm_mips_tlb *tlb;
unsigned long entryhi;
int index;
if (KVM_GUEST_KSEGX(badvaddr) < KVM_GUEST_KSEG0
|| KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG23) {
kvm_debug("USER/KSEG23 ADDR TLB MOD fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
cause, opc, badvaddr);
er = kvm_mips_handle_tlbmod(cause, opc, run, vcpu);
if (er == EMULATE_DONE)
ret = RESUME_GUEST;
else {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
ret = RESUME_HOST;
}
} else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) {
/*
* XXXKYMA: The guest kernel does not expect to get this fault
* when we are not using HIGHMEM. Need to address this in a
* HIGHMEM kernel
* First find the mapping in the guest TLB. If the failure to
* write was due to the guest TLB, it should be up to the guest
* to handle it.
*/
kvm_err("TLB MOD fault not handled, cause %#x, PC: %p, BadVaddr: %#lx\n",
cause, opc, badvaddr);
kvm_mips_dump_host_tlbs();
kvm_arch_vcpu_dump_regs(vcpu);
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
ret = RESUME_HOST;
entryhi = (badvaddr & VPN2_MASK) |
(kvm_read_c0_guest_entryhi(cop0) & KVM_ENTRYHI_ASID);
index = kvm_mips_guest_tlb_lookup(vcpu, entryhi);
/*
* These should never happen.
* They would indicate stale host TLB entries.
*/
if (unlikely(index < 0)) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return RESUME_HOST;
}
tlb = vcpu->arch.guest_tlb + index;
if (unlikely(!TLB_IS_VALID(*tlb, badvaddr))) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return RESUME_HOST;
}
/*
* Guest entry not dirty? That would explain the TLB modified
* exception. Relay that on to the guest so it can handle it.
*/
if (!TLB_IS_DIRTY(*tlb, badvaddr)) {
kvm_mips_emulate_tlbmod(cause, opc, run, vcpu);
return RESUME_GUEST;
}
if (kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, badvaddr,
true))
/* Not writable, needs handling as MMIO */
return kvm_mips_bad_store(cause, opc, run, vcpu);
return RESUME_GUEST;
} else if (KVM_GUEST_KSEGX(badvaddr) == KVM_GUEST_KSEG0) {
if (kvm_mips_handle_kseg0_tlb_fault(badvaddr, vcpu, true) < 0)
/* Not writable, needs handling as MMIO */
return kvm_mips_bad_store(cause, opc, run, vcpu);
return RESUME_GUEST;
} else {
kvm_err("Illegal TLB Mod fault address , cause %#x, PC: %p, BadVaddr: %#lx\n",
cause, opc, badvaddr);
kvm_mips_dump_host_tlbs();
kvm_arch_vcpu_dump_regs(vcpu);
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
ret = RESUME_HOST;
/* host kernel addresses are all handled as MMIO */
return kvm_mips_bad_store(cause, opc, run, vcpu);
}
return ret;
}
static int kvm_trap_emul_handle_tlb_miss(struct kvm_vcpu *vcpu, bool store)
@ -157,7 +248,7 @@ static int kvm_trap_emul_handle_tlb_miss(struct kvm_vcpu *vcpu, bool store)
* into the shadow host TLB
*/
er = kvm_mips_handle_tlbmiss(cause, opc, run, vcpu);
er = kvm_mips_handle_tlbmiss(cause, opc, run, vcpu, store);
if (er == EMULATE_DONE)
ret = RESUME_GUEST;
else {
@ -169,29 +260,15 @@ static int kvm_trap_emul_handle_tlb_miss(struct kvm_vcpu *vcpu, bool store)
* All KSEG0 faults are handled by KVM, as the guest kernel does
* not expect to ever get them
*/
if (kvm_mips_handle_kseg0_tlb_fault
(vcpu->arch.host_cp0_badvaddr, vcpu) < 0) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
ret = RESUME_HOST;
}
if (kvm_mips_handle_kseg0_tlb_fault(badvaddr, vcpu, store) < 0)
ret = kvm_mips_bad_access(cause, opc, run, vcpu, store);
} else if (KVM_GUEST_KERNEL_MODE(vcpu)
&& (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1)) {
/*
* With EVA we may get a TLB exception instead of an address
* error when the guest performs MMIO to KSeg1 addresses.
*/
kvm_debug("Emulate %s MMIO space\n",
store ? "Store to" : "Load from");
er = kvm_mips_emulate_inst(cause, opc, run, vcpu);
if (er == EMULATE_FAIL) {
kvm_err("Emulate %s MMIO space failed\n",
store ? "Store to" : "Load from");
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
ret = RESUME_HOST;
} else {
run->exit_reason = KVM_EXIT_MMIO;
ret = RESUME_HOST;
}
ret = kvm_mips_bad_access(cause, opc, run, vcpu, store);
} else {
kvm_err("Illegal TLB %s fault address , cause %#x, PC: %p, BadVaddr: %#lx\n",
store ? "ST" : "LD", cause, opc, badvaddr);
@ -219,21 +296,11 @@ static int kvm_trap_emul_handle_addr_err_st(struct kvm_vcpu *vcpu)
u32 __user *opc = (u32 __user *) vcpu->arch.pc;
unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
u32 cause = vcpu->arch.host_cp0_cause;
enum emulation_result er = EMULATE_DONE;
int ret = RESUME_GUEST;
if (KVM_GUEST_KERNEL_MODE(vcpu)
&& (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1)) {
kvm_debug("Emulate Store to MMIO space\n");
er = kvm_mips_emulate_inst(cause, opc, run, vcpu);
if (er == EMULATE_FAIL) {
kvm_err("Emulate Store to MMIO space failed\n");
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
ret = RESUME_HOST;
} else {
run->exit_reason = KVM_EXIT_MMIO;
ret = RESUME_HOST;
}
ret = kvm_mips_bad_store(cause, opc, run, vcpu);
} else {
kvm_err("Address Error (STORE): cause %#x, PC: %p, BadVaddr: %#lx\n",
cause, opc, badvaddr);
@ -249,26 +316,15 @@ static int kvm_trap_emul_handle_addr_err_ld(struct kvm_vcpu *vcpu)
u32 __user *opc = (u32 __user *) vcpu->arch.pc;
unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
u32 cause = vcpu->arch.host_cp0_cause;
enum emulation_result er = EMULATE_DONE;
int ret = RESUME_GUEST;
if (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1) {
kvm_debug("Emulate Load from MMIO space @ %#lx\n", badvaddr);
er = kvm_mips_emulate_inst(cause, opc, run, vcpu);
if (er == EMULATE_FAIL) {
kvm_err("Emulate Load from MMIO space failed\n");
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
ret = RESUME_HOST;
} else {
run->exit_reason = KVM_EXIT_MMIO;
ret = RESUME_HOST;
}
ret = kvm_mips_bad_load(cause, opc, run, vcpu);
} else {
kvm_err("Address Error (LOAD): cause %#x, PC: %p, BadVaddr: %#lx\n",
cause, opc, badvaddr);
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
ret = RESUME_HOST;
er = EMULATE_FAIL;
}
return ret;
}
@ -428,16 +484,75 @@ static int kvm_trap_emul_handle_msa_disabled(struct kvm_vcpu *vcpu)
return ret;
}
static int kvm_trap_emul_vm_init(struct kvm *kvm)
static int kvm_trap_emul_vcpu_init(struct kvm_vcpu *vcpu)
{
struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
/*
* Allocate GVA -> HPA page tables.
* MIPS doesn't use the mm_struct pointer argument.
*/
kern_mm->pgd = pgd_alloc(kern_mm);
if (!kern_mm->pgd)
return -ENOMEM;
user_mm->pgd = pgd_alloc(user_mm);
if (!user_mm->pgd) {
pgd_free(kern_mm, kern_mm->pgd);
return -ENOMEM;
}
return 0;
}
static int kvm_trap_emul_vcpu_init(struct kvm_vcpu *vcpu)
static void kvm_mips_emul_free_gva_pt(pgd_t *pgd)
{
vcpu->arch.kscratch_enabled = 0xfc;
/* Don't free host kernel page tables copied from init_mm.pgd */
const unsigned long end = 0x80000000;
unsigned long pgd_va, pud_va, pmd_va;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
int i, j, k;
return 0;
for (i = 0; i < USER_PTRS_PER_PGD; i++) {
if (pgd_none(pgd[i]))
continue;
pgd_va = (unsigned long)i << PGDIR_SHIFT;
if (pgd_va >= end)
break;
pud = pud_offset(pgd + i, 0);
for (j = 0; j < PTRS_PER_PUD; j++) {
if (pud_none(pud[j]))
continue;
pud_va = pgd_va | ((unsigned long)j << PUD_SHIFT);
if (pud_va >= end)
break;
pmd = pmd_offset(pud + j, 0);
for (k = 0; k < PTRS_PER_PMD; k++) {
if (pmd_none(pmd[k]))
continue;
pmd_va = pud_va | (k << PMD_SHIFT);
if (pmd_va >= end)
break;
pte = pte_offset(pmd + k, 0);
pte_free_kernel(NULL, pte);
}
pmd_free(NULL, pmd);
}
pud_free(NULL, pud);
}
pgd_free(NULL, pgd);
}
static void kvm_trap_emul_vcpu_uninit(struct kvm_vcpu *vcpu)
{
kvm_mips_emul_free_gva_pt(vcpu->arch.guest_kernel_mm.pgd);
kvm_mips_emul_free_gva_pt(vcpu->arch.guest_user_mm.pgd);
}
static int kvm_trap_emul_vcpu_setup(struct kvm_vcpu *vcpu)
@ -499,6 +614,9 @@ static int kvm_trap_emul_vcpu_setup(struct kvm_vcpu *vcpu)
/* Set Wait IE/IXMT Ignore in Config7, IAR, AR */
kvm_write_c0_guest_config7(cop0, (MIPS_CONF7_WII) | (1 << 10));
/* Status */
kvm_write_c0_guest_status(cop0, ST0_BEV | ST0_ERL);
/*
* Setup IntCtl defaults, compatibility mode for timer interrupts (HW5)
*/
@ -508,17 +626,76 @@ static int kvm_trap_emul_vcpu_setup(struct kvm_vcpu *vcpu)
kvm_write_c0_guest_ebase(cop0, KVM_GUEST_KSEG0 |
(vcpu_id & MIPS_EBASE_CPUNUM));
/* Put PC at guest reset vector */
vcpu->arch.pc = KVM_GUEST_CKSEG1ADDR(0x1fc00000);
return 0;
}
static void kvm_trap_emul_flush_shadow_all(struct kvm *kvm)
{
/* Flush GVA page tables and invalidate GVA ASIDs on all VCPUs */
kvm_flush_remote_tlbs(kvm);
}
static void kvm_trap_emul_flush_shadow_memslot(struct kvm *kvm,
const struct kvm_memory_slot *slot)
{
kvm_trap_emul_flush_shadow_all(kvm);
}
static u64 kvm_trap_emul_get_one_regs[] = {
KVM_REG_MIPS_CP0_INDEX,
KVM_REG_MIPS_CP0_ENTRYLO0,
KVM_REG_MIPS_CP0_ENTRYLO1,
KVM_REG_MIPS_CP0_CONTEXT,
KVM_REG_MIPS_CP0_USERLOCAL,
KVM_REG_MIPS_CP0_PAGEMASK,
KVM_REG_MIPS_CP0_WIRED,
KVM_REG_MIPS_CP0_HWRENA,
KVM_REG_MIPS_CP0_BADVADDR,
KVM_REG_MIPS_CP0_COUNT,
KVM_REG_MIPS_CP0_ENTRYHI,
KVM_REG_MIPS_CP0_COMPARE,
KVM_REG_MIPS_CP0_STATUS,
KVM_REG_MIPS_CP0_INTCTL,
KVM_REG_MIPS_CP0_CAUSE,
KVM_REG_MIPS_CP0_EPC,
KVM_REG_MIPS_CP0_PRID,
KVM_REG_MIPS_CP0_EBASE,
KVM_REG_MIPS_CP0_CONFIG,
KVM_REG_MIPS_CP0_CONFIG1,
KVM_REG_MIPS_CP0_CONFIG2,
KVM_REG_MIPS_CP0_CONFIG3,
KVM_REG_MIPS_CP0_CONFIG4,
KVM_REG_MIPS_CP0_CONFIG5,
KVM_REG_MIPS_CP0_CONFIG7,
KVM_REG_MIPS_CP0_ERROREPC,
KVM_REG_MIPS_CP0_KSCRATCH1,
KVM_REG_MIPS_CP0_KSCRATCH2,
KVM_REG_MIPS_CP0_KSCRATCH3,
KVM_REG_MIPS_CP0_KSCRATCH4,
KVM_REG_MIPS_CP0_KSCRATCH5,
KVM_REG_MIPS_CP0_KSCRATCH6,
KVM_REG_MIPS_COUNT_CTL,
KVM_REG_MIPS_COUNT_RESUME,
KVM_REG_MIPS_COUNT_HZ,
};
static unsigned long kvm_trap_emul_num_regs(struct kvm_vcpu *vcpu)
{
return 0;
return ARRAY_SIZE(kvm_trap_emul_get_one_regs);
}
static int kvm_trap_emul_copy_reg_indices(struct kvm_vcpu *vcpu,
u64 __user *indices)
{
if (copy_to_user(indices, kvm_trap_emul_get_one_regs,
sizeof(kvm_trap_emul_get_one_regs)))
return -EFAULT;
indices += ARRAY_SIZE(kvm_trap_emul_get_one_regs);
return 0;
}
@ -526,7 +703,81 @@ static int kvm_trap_emul_get_one_reg(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg,
s64 *v)
{
struct mips_coproc *cop0 = vcpu->arch.cop0;
switch (reg->id) {
case KVM_REG_MIPS_CP0_INDEX:
*v = (long)kvm_read_c0_guest_index(cop0);
break;
case KVM_REG_MIPS_CP0_ENTRYLO0:
*v = kvm_read_c0_guest_entrylo0(cop0);
break;
case KVM_REG_MIPS_CP0_ENTRYLO1:
*v = kvm_read_c0_guest_entrylo1(cop0);
break;
case KVM_REG_MIPS_CP0_CONTEXT:
*v = (long)kvm_read_c0_guest_context(cop0);
break;
case KVM_REG_MIPS_CP0_USERLOCAL:
*v = (long)kvm_read_c0_guest_userlocal(cop0);
break;
case KVM_REG_MIPS_CP0_PAGEMASK:
*v = (long)kvm_read_c0_guest_pagemask(cop0);
break;
case KVM_REG_MIPS_CP0_WIRED:
*v = (long)kvm_read_c0_guest_wired(cop0);
break;
case KVM_REG_MIPS_CP0_HWRENA:
*v = (long)kvm_read_c0_guest_hwrena(cop0);
break;
case KVM_REG_MIPS_CP0_BADVADDR:
*v = (long)kvm_read_c0_guest_badvaddr(cop0);
break;
case KVM_REG_MIPS_CP0_ENTRYHI:
*v = (long)kvm_read_c0_guest_entryhi(cop0);
break;
case KVM_REG_MIPS_CP0_COMPARE:
*v = (long)kvm_read_c0_guest_compare(cop0);
break;
case KVM_REG_MIPS_CP0_STATUS:
*v = (long)kvm_read_c0_guest_status(cop0);
break;
case KVM_REG_MIPS_CP0_INTCTL:
*v = (long)kvm_read_c0_guest_intctl(cop0);
break;
case KVM_REG_MIPS_CP0_CAUSE:
*v = (long)kvm_read_c0_guest_cause(cop0);
break;
case KVM_REG_MIPS_CP0_EPC:
*v = (long)kvm_read_c0_guest_epc(cop0);
break;
case KVM_REG_MIPS_CP0_PRID:
*v = (long)kvm_read_c0_guest_prid(cop0);
break;
case KVM_REG_MIPS_CP0_EBASE:
*v = (long)kvm_read_c0_guest_ebase(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG:
*v = (long)kvm_read_c0_guest_config(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG1:
*v = (long)kvm_read_c0_guest_config1(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG2:
*v = (long)kvm_read_c0_guest_config2(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG3:
*v = (long)kvm_read_c0_guest_config3(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG4:
*v = (long)kvm_read_c0_guest_config4(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG5:
*v = (long)kvm_read_c0_guest_config5(cop0);
break;
case KVM_REG_MIPS_CP0_CONFIG7:
*v = (long)kvm_read_c0_guest_config7(cop0);
break;
case KVM_REG_MIPS_CP0_COUNT:
*v = kvm_mips_read_count(vcpu);
break;
@ -539,6 +790,27 @@ static int kvm_trap_emul_get_one_reg(struct kvm_vcpu *vcpu,
case KVM_REG_MIPS_COUNT_HZ:
*v = vcpu->arch.count_hz;
break;
case KVM_REG_MIPS_CP0_ERROREPC:
*v = (long)kvm_read_c0_guest_errorepc(cop0);
break;
case KVM_REG_MIPS_CP0_KSCRATCH1:
*v = (long)kvm_read_c0_guest_kscratch1(cop0);
break;
case KVM_REG_MIPS_CP0_KSCRATCH2:
*v = (long)kvm_read_c0_guest_kscratch2(cop0);
break;
case KVM_REG_MIPS_CP0_KSCRATCH3:
*v = (long)kvm_read_c0_guest_kscratch3(cop0);
break;
case KVM_REG_MIPS_CP0_KSCRATCH4:
*v = (long)kvm_read_c0_guest_kscratch4(cop0);
break;
case KVM_REG_MIPS_CP0_KSCRATCH5:
*v = (long)kvm_read_c0_guest_kscratch5(cop0);
break;
case KVM_REG_MIPS_CP0_KSCRATCH6:
*v = (long)kvm_read_c0_guest_kscratch6(cop0);
break;
default:
return -EINVAL;
}
@ -554,6 +826,56 @@ static int kvm_trap_emul_set_one_reg(struct kvm_vcpu *vcpu,
unsigned int cur, change;
switch (reg->id) {
case KVM_REG_MIPS_CP0_INDEX:
kvm_write_c0_guest_index(cop0, v);
break;
case KVM_REG_MIPS_CP0_ENTRYLO0:
kvm_write_c0_guest_entrylo0(cop0, v);
break;
case KVM_REG_MIPS_CP0_ENTRYLO1:
kvm_write_c0_guest_entrylo1(cop0, v);
break;
case KVM_REG_MIPS_CP0_CONTEXT:
kvm_write_c0_guest_context(cop0, v);
break;
case KVM_REG_MIPS_CP0_USERLOCAL:
kvm_write_c0_guest_userlocal(cop0, v);
break;
case KVM_REG_MIPS_CP0_PAGEMASK:
kvm_write_c0_guest_pagemask(cop0, v);
break;
case KVM_REG_MIPS_CP0_WIRED:
kvm_write_c0_guest_wired(cop0, v);
break;
case KVM_REG_MIPS_CP0_HWRENA:
kvm_write_c0_guest_hwrena(cop0, v);
break;
case KVM_REG_MIPS_CP0_BADVADDR:
kvm_write_c0_guest_badvaddr(cop0, v);
break;
case KVM_REG_MIPS_CP0_ENTRYHI:
kvm_write_c0_guest_entryhi(cop0, v);
break;
case KVM_REG_MIPS_CP0_STATUS:
kvm_write_c0_guest_status(cop0, v);
break;
case KVM_REG_MIPS_CP0_INTCTL:
/* No VInt, so no VS, read-only for now */
break;
case KVM_REG_MIPS_CP0_EPC:
kvm_write_c0_guest_epc(cop0, v);
break;
case KVM_REG_MIPS_CP0_PRID:
kvm_write_c0_guest_prid(cop0, v);
break;
case KVM_REG_MIPS_CP0_EBASE:
/*
* Allow core number to be written, but the exception base must
* remain in guest KSeg0.
*/
kvm_change_c0_guest_ebase(cop0, 0x1ffff000 | MIPS_EBASE_CPUNUM,
v);
break;
case KVM_REG_MIPS_CP0_COUNT:
kvm_mips_write_count(vcpu, v);
break;
@ -618,6 +940,9 @@ static int kvm_trap_emul_set_one_reg(struct kvm_vcpu *vcpu,
kvm_write_c0_guest_config5(cop0, v);
}
break;
case KVM_REG_MIPS_CP0_CONFIG7:
/* writes ignored */
break;
case KVM_REG_MIPS_COUNT_CTL:
ret = kvm_mips_set_count_ctl(vcpu, v);
break;
@ -627,24 +952,269 @@ static int kvm_trap_emul_set_one_reg(struct kvm_vcpu *vcpu,
case KVM_REG_MIPS_COUNT_HZ:
ret = kvm_mips_set_count_hz(vcpu, v);
break;
case KVM_REG_MIPS_CP0_ERROREPC:
kvm_write_c0_guest_errorepc(cop0, v);
break;
case KVM_REG_MIPS_CP0_KSCRATCH1:
kvm_write_c0_guest_kscratch1(cop0, v);
break;
case KVM_REG_MIPS_CP0_KSCRATCH2:
kvm_write_c0_guest_kscratch2(cop0, v);
break;
case KVM_REG_MIPS_CP0_KSCRATCH3:
kvm_write_c0_guest_kscratch3(cop0, v);
break;
case KVM_REG_MIPS_CP0_KSCRATCH4:
kvm_write_c0_guest_kscratch4(cop0, v);
break;
case KVM_REG_MIPS_CP0_KSCRATCH5:
kvm_write_c0_guest_kscratch5(cop0, v);
break;
case KVM_REG_MIPS_CP0_KSCRATCH6:
kvm_write_c0_guest_kscratch6(cop0, v);
break;
default:
return -EINVAL;
}
return ret;
}
static int kvm_trap_emul_vcpu_get_regs(struct kvm_vcpu *vcpu)
static int kvm_trap_emul_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
kvm_lose_fpu(vcpu);
struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
struct mm_struct *mm;
/*
* Were we in guest context? If so, restore the appropriate ASID based
* on the mode of the Guest (Kernel/User).
*/
if (current->flags & PF_VCPU) {
mm = KVM_GUEST_KERNEL_MODE(vcpu) ? kern_mm : user_mm;
if ((cpu_context(cpu, mm) ^ asid_cache(cpu)) &
asid_version_mask(cpu))
get_new_mmu_context(mm, cpu);
write_c0_entryhi(cpu_asid(cpu, mm));
TLBMISS_HANDLER_SETUP_PGD(mm->pgd);
kvm_mips_suspend_mm(cpu);
ehb();
}
return 0;
}
static int kvm_trap_emul_vcpu_set_regs(struct kvm_vcpu *vcpu)
static int kvm_trap_emul_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
{
kvm_lose_fpu(vcpu);
if (current->flags & PF_VCPU) {
/* Restore normal Linux process memory map */
if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
asid_version_mask(cpu)))
get_new_mmu_context(current->mm, cpu);
write_c0_entryhi(cpu_asid(cpu, current->mm));
TLBMISS_HANDLER_SETUP_PGD(current->mm->pgd);
kvm_mips_resume_mm(cpu);
ehb();
}
return 0;
}
static void kvm_trap_emul_check_requests(struct kvm_vcpu *vcpu, int cpu,
bool reload_asid)
{
struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
struct mm_struct *mm;
int i;
if (likely(!vcpu->requests))
return;
if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
/*
* Both kernel & user GVA mappings must be invalidated. The
* caller is just about to check whether the ASID is stale
* anyway so no need to reload it here.
*/
kvm_mips_flush_gva_pt(kern_mm->pgd, KMF_GPA | KMF_KERN);
kvm_mips_flush_gva_pt(user_mm->pgd, KMF_GPA | KMF_USER);
for_each_possible_cpu(i) {
cpu_context(i, kern_mm) = 0;
cpu_context(i, user_mm) = 0;
}
/* Generate new ASID for current mode */
if (reload_asid) {
mm = KVM_GUEST_KERNEL_MODE(vcpu) ? kern_mm : user_mm;
get_new_mmu_context(mm, cpu);
htw_stop();
write_c0_entryhi(cpu_asid(cpu, mm));
TLBMISS_HANDLER_SETUP_PGD(mm->pgd);
htw_start();
}
}
}
/**
* kvm_trap_emul_gva_lockless_begin() - Begin lockless access to GVA space.
* @vcpu: VCPU pointer.
*
* Call before a GVA space access outside of guest mode, to ensure that
* asynchronous TLB flush requests are handled or delayed until completion of
* the GVA access (as indicated by a matching kvm_trap_emul_gva_lockless_end()).
*
* Should be called with IRQs already enabled.
*/
void kvm_trap_emul_gva_lockless_begin(struct kvm_vcpu *vcpu)
{
/* We re-enable IRQs in kvm_trap_emul_gva_lockless_end() */
WARN_ON_ONCE(irqs_disabled());
/*
* The caller is about to access the GVA space, so we set the mode to
* force TLB flush requests to send an IPI, and also disable IRQs to
* delay IPI handling until kvm_trap_emul_gva_lockless_end().
*/
local_irq_disable();
/*
* Make sure the read of VCPU requests is not reordered ahead of the
* write to vcpu->mode, or we could miss a TLB flush request while
* the requester sees the VCPU as outside of guest mode and not needing
* an IPI.
*/
smp_store_mb(vcpu->mode, READING_SHADOW_PAGE_TABLES);
/*
* If a TLB flush has been requested (potentially while
* OUTSIDE_GUEST_MODE and assumed immediately effective), perform it
* before accessing the GVA space, and be sure to reload the ASID if
* necessary as it'll be immediately used.
*
* TLB flush requests after this check will trigger an IPI due to the
* mode change above, which will be delayed due to IRQs disabled.
*/
kvm_trap_emul_check_requests(vcpu, smp_processor_id(), true);
}
/**
* kvm_trap_emul_gva_lockless_end() - End lockless access to GVA space.
* @vcpu: VCPU pointer.
*
* Called after a GVA space access outside of guest mode. Should have a matching
* call to kvm_trap_emul_gva_lockless_begin().
*/
void kvm_trap_emul_gva_lockless_end(struct kvm_vcpu *vcpu)
{
/*
* Make sure the write to vcpu->mode is not reordered in front of GVA
* accesses, or a TLB flush requester may not think it necessary to send
* an IPI.
*/
smp_store_release(&vcpu->mode, OUTSIDE_GUEST_MODE);
/*
* Now that the access to GVA space is complete, its safe for pending
* TLB flush request IPIs to be handled (which indicates completion).
*/
local_irq_enable();
}
static void kvm_trap_emul_vcpu_reenter(struct kvm_run *run,
struct kvm_vcpu *vcpu)
{
struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm;
struct mm_struct *user_mm = &vcpu->arch.guest_user_mm;
struct mm_struct *mm;
struct mips_coproc *cop0 = vcpu->arch.cop0;
int i, cpu = smp_processor_id();
unsigned int gasid;
/*
* No need to reload ASID, IRQs are disabled already so there's no rush,
* and we'll check if we need to regenerate below anyway before
* re-entering the guest.
*/
kvm_trap_emul_check_requests(vcpu, cpu, false);
if (KVM_GUEST_KERNEL_MODE(vcpu)) {
mm = kern_mm;
} else {
mm = user_mm;
/*
* Lazy host ASID regeneration / PT flush for guest user mode.
* If the guest ASID has changed since the last guest usermode
* execution, invalidate the stale TLB entries and flush GVA PT
* entries too.
*/
gasid = kvm_read_c0_guest_entryhi(cop0) & KVM_ENTRYHI_ASID;
if (gasid != vcpu->arch.last_user_gasid) {
kvm_mips_flush_gva_pt(user_mm->pgd, KMF_USER);
for_each_possible_cpu(i)
cpu_context(i, user_mm) = 0;
vcpu->arch.last_user_gasid = gasid;
}
}
/*
* Check if ASID is stale. This may happen due to a TLB flush request or
* a lazy user MM invalidation.
*/
if ((cpu_context(cpu, mm) ^ asid_cache(cpu)) &
asid_version_mask(cpu))
get_new_mmu_context(mm, cpu);
}
static int kvm_trap_emul_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
int cpu = smp_processor_id();
int r;
/* Check if we have any exceptions/interrupts pending */
kvm_mips_deliver_interrupts(vcpu,
kvm_read_c0_guest_cause(vcpu->arch.cop0));
kvm_trap_emul_vcpu_reenter(run, vcpu);
/*
* We use user accessors to access guest memory, but we don't want to
* invoke Linux page faulting.
*/
pagefault_disable();
/* Disable hardware page table walking while in guest */
htw_stop();
/*
* While in guest context we're in the guest's address space, not the
* host process address space, so we need to be careful not to confuse
* e.g. cache management IPIs.
*/
kvm_mips_suspend_mm(cpu);
r = vcpu->arch.vcpu_run(run, vcpu);
/* We may have migrated while handling guest exits */
cpu = smp_processor_id();
/* Restore normal Linux process memory map */
if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
asid_version_mask(cpu)))
get_new_mmu_context(current->mm, cpu);
write_c0_entryhi(cpu_asid(cpu, current->mm));
TLBMISS_HANDLER_SETUP_PGD(current->mm->pgd);
kvm_mips_resume_mm(cpu);
htw_start();
pagefault_enable();
return r;
}
static struct kvm_mips_callbacks kvm_trap_emul_callbacks = {
/* exit handlers */
.handle_cop_unusable = kvm_trap_emul_handle_cop_unusable,
@ -661,9 +1231,11 @@ static struct kvm_mips_callbacks kvm_trap_emul_callbacks = {
.handle_fpe = kvm_trap_emul_handle_fpe,
.handle_msa_disabled = kvm_trap_emul_handle_msa_disabled,
.vm_init = kvm_trap_emul_vm_init,
.vcpu_init = kvm_trap_emul_vcpu_init,
.vcpu_uninit = kvm_trap_emul_vcpu_uninit,
.vcpu_setup = kvm_trap_emul_vcpu_setup,
.flush_shadow_all = kvm_trap_emul_flush_shadow_all,
.flush_shadow_memslot = kvm_trap_emul_flush_shadow_memslot,
.gva_to_gpa = kvm_trap_emul_gva_to_gpa_cb,
.queue_timer_int = kvm_mips_queue_timer_int_cb,
.dequeue_timer_int = kvm_mips_dequeue_timer_int_cb,
@ -675,8 +1247,10 @@ static struct kvm_mips_callbacks kvm_trap_emul_callbacks = {
.copy_reg_indices = kvm_trap_emul_copy_reg_indices,
.get_one_reg = kvm_trap_emul_get_one_reg,
.set_one_reg = kvm_trap_emul_set_one_reg,
.vcpu_get_regs = kvm_trap_emul_vcpu_get_regs,
.vcpu_set_regs = kvm_trap_emul_vcpu_set_regs,
.vcpu_load = kvm_trap_emul_vcpu_load,
.vcpu_put = kvm_trap_emul_vcpu_put,
.vcpu_run = kvm_trap_emul_vcpu_run,
.vcpu_reenter = kvm_trap_emul_vcpu_reenter,
};
int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks)

16
arch/powerpc/include/asm/kvm_book3s_64.h
View File

@ -22,6 +22,10 @@
#include <asm/book3s/64/mmu-hash.h>
/* Power architecture requires HPT is at least 256kiB, at most 64TiB */
#define PPC_MIN_HPT_ORDER 18
#define PPC_MAX_HPT_ORDER 46
#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
static inline struct kvmppc_book3s_shadow_vcpu *svcpu_get(struct kvm_vcpu *vcpu)
{
@ -356,6 +360,18 @@ extern void kvmppc_mmu_debugfs_init(struct kvm *kvm);
extern void kvmhv_rm_send_ipi(int cpu);
static inline unsigned long kvmppc_hpt_npte(struct kvm_hpt_info *hpt)
{
/* HPTEs are 2**4 bytes long */
return 1UL << (hpt->order - 4);
}
static inline unsigned long kvmppc_hpt_mask(struct kvm_hpt_info *hpt)
{
/* 128 (2**7) bytes in each HPTEG */
return (1UL << (hpt->order - 7)) - 1;
}
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
#endif /* __ASM_KVM_BOOK3S_64_H__ */

21
arch/powerpc/include/asm/kvm_host.h
View File

@ -241,12 +241,24 @@ struct kvm_arch_memory_slot {
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
};
struct kvm_hpt_info {
/* Host virtual (linear mapping) address of guest HPT */
unsigned long virt;
/* Array of reverse mapping entries for each guest HPTE */
struct revmap_entry *rev;
/* Guest HPT size is 2**(order) bytes */
u32 order;
/* 1 if HPT allocated with CMA, 0 otherwise */
int cma;
};
struct kvm_resize_hpt;
struct kvm_arch {
unsigned int lpid;
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
unsigned int tlb_sets;
unsigned long hpt_virt;
struct revmap_entry *revmap;
struct kvm_hpt_info hpt;
atomic64_t mmio_update;
unsigned int host_lpid;
unsigned long host_lpcr;
@ -256,20 +268,17 @@ struct kvm_arch {
unsigned long lpcr;
unsigned long vrma_slb_v;
int hpte_setup_done;
u32 hpt_order;
atomic_t vcpus_running;
u32 online_vcores;
unsigned long hpt_npte;
unsigned long hpt_mask;
atomic_t hpte_mod_interest;
cpumask_t need_tlb_flush;
cpumask_t cpu_in_guest;
int hpt_cma_alloc;
u8 radix;
pgd_t *pgtable;
u64 process_table;
struct dentry *debugfs_dir;
struct dentry *htab_dentry;
struct kvm_resize_hpt *resize_hpt; /* protected by kvm->lock */
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
struct mutex hpt_mutex;

15
arch/powerpc/include/asm/kvm_ppc.h
View File

@ -155,9 +155,10 @@ extern void kvmppc_core_destroy_mmu(struct kvm_vcpu *vcpu);
extern int kvmppc_kvm_pv(struct kvm_vcpu *vcpu);
extern void kvmppc_map_magic(struct kvm_vcpu *vcpu);
extern long kvmppc_alloc_hpt(struct kvm *kvm, u32 *htab_orderp);
extern long kvmppc_alloc_reset_hpt(struct kvm *kvm, u32 *htab_orderp);
extern void kvmppc_free_hpt(struct kvm *kvm);
extern int kvmppc_allocate_hpt(struct kvm_hpt_info *info, u32 order);
extern void kvmppc_set_hpt(struct kvm *kvm, struct kvm_hpt_info *info);
extern long kvmppc_alloc_reset_hpt(struct kvm *kvm, int order);
extern void kvmppc_free_hpt(struct kvm_hpt_info *info);
extern long kvmppc_prepare_vrma(struct kvm *kvm,
struct kvm_userspace_memory_region *mem);
extern void kvmppc_map_vrma(struct kvm_vcpu *vcpu,
@ -186,8 +187,8 @@ extern long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
unsigned long tce_value, unsigned long npages);
extern long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
unsigned long ioba);
extern struct page *kvm_alloc_hpt(unsigned long nr_pages);
extern void kvm_release_hpt(struct page *page, unsigned long nr_pages);
extern struct page *kvm_alloc_hpt_cma(unsigned long nr_pages);
extern void kvm_free_hpt_cma(struct page *page, unsigned long nr_pages);
extern int kvmppc_core_init_vm(struct kvm *kvm);
extern void kvmppc_core_destroy_vm(struct kvm *kvm);
extern void kvmppc_core_free_memslot(struct kvm *kvm,
@ -214,6 +215,10 @@ extern void kvmppc_bookehv_exit(void);
extern int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu);
extern int kvm_vm_ioctl_get_htab_fd(struct kvm *kvm, struct kvm_get_htab_fd *);
extern long kvm_vm_ioctl_resize_hpt_prepare(struct kvm *kvm,
struct kvm_ppc_resize_hpt *rhpt);
extern long kvm_vm_ioctl_resize_hpt_commit(struct kvm *kvm,
struct kvm_ppc_resize_hpt *rhpt);
int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq);

2
arch/powerpc/include/uapi/asm/kvm.h
View File

@ -633,5 +633,7 @@ struct kvm_ppc_rmmu_info {
#define KVM_XICS_LEVEL_SENSITIVE (1ULL << 40)
#define KVM_XICS_MASKED (1ULL << 41)
#define KVM_XICS_PENDING (1ULL << 42)
#define KVM_XICS_PRESENTED (1ULL << 43)
#define KVM_XICS_QUEUED (1ULL << 44)
#endif /* __LINUX_KVM_POWERPC_H */

3
arch/powerpc/kvm/book3s_32_mmu.c
View File

@ -224,7 +224,8 @@ static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary);
if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
printk(KERN_ERR "KVM: Can't copy data from 0x%lx!\n", ptegp);
printk_ratelimited(KERN_ERR
"KVM: Can't copy data from 0x%lx!\n", ptegp);
goto no_page_found;
}

3
arch/powerpc/kvm/book3s_64_mmu.c
View File

@ -265,7 +265,8 @@ do_second:
goto no_page_found;
if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
printk(KERN_ERR "KVM can't copy data from 0x%lx!\n", ptegp);
printk_ratelimited(KERN_ERR
"KVM: Can't copy data from 0x%lx!\n", ptegp);
goto no_page_found;
}

637
arch/powerpc/kvm/book3s_64_mmu_hv.c
View File

@ -40,84 +40,101 @@
#include "trace_hv.h"
/* Power architecture requires HPT is at least 256kB */
#define PPC_MIN_HPT_ORDER 18
//#define DEBUG_RESIZE_HPT 1
#ifdef DEBUG_RESIZE_HPT
#define resize_hpt_debug(resize, ...) \
do { \
printk(KERN_DEBUG "RESIZE HPT %p: ", resize); \
printk(__VA_ARGS__); \
} while (0)
#else
#define resize_hpt_debug(resize, ...) \
do { } while (0)
#endif
static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags,
long pte_index, unsigned long pteh,
unsigned long ptel, unsigned long *pte_idx_ret);
struct kvm_resize_hpt {
/* These fields read-only after init */
struct kvm *kvm;
struct work_struct work;
u32 order;
/* These fields protected by kvm->lock */
int error;
bool prepare_done;
/* Private to the work thread, until prepare_done is true,
* then protected by kvm->resize_hpt_sem */
struct kvm_hpt_info hpt;
};
static void kvmppc_rmap_reset(struct kvm *kvm);
long kvmppc_alloc_hpt(struct kvm *kvm, u32 *htab_orderp)
int kvmppc_allocate_hpt(struct kvm_hpt_info *info, u32 order)
{
unsigned long hpt = 0;
struct revmap_entry *rev;
int cma = 0;
struct page *page = NULL;
long order = KVM_DEFAULT_HPT_ORDER;
struct revmap_entry *rev;
unsigned long npte;
if (htab_orderp) {
order = *htab_orderp;
if (order < PPC_MIN_HPT_ORDER)
order = PPC_MIN_HPT_ORDER;
}
if ((order < PPC_MIN_HPT_ORDER) || (order > PPC_MAX_HPT_ORDER))
return -EINVAL;
kvm->arch.hpt_cma_alloc = 0;
page = kvm_alloc_hpt(1ul << (order - PAGE_SHIFT));
page = kvm_alloc_hpt_cma(1ul << (order - PAGE_SHIFT));
if (page) {
hpt = (unsigned long)pfn_to_kaddr(page_to_pfn(page));
memset((void *)hpt, 0, (1ul << order));
kvm->arch.hpt_cma_alloc = 1;
cma = 1;
}
/* Lastly try successively smaller sizes from the page allocator */
/* Only do this if userspace didn't specify a size via ioctl */
while (!hpt && order > PPC_MIN_HPT_ORDER && !htab_orderp) {
hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT|
__GFP_NOWARN, order - PAGE_SHIFT);
if (!hpt)
--order;
}
if (!hpt)
hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT
|__GFP_NOWARN, order - PAGE_SHIFT);
if (!hpt)
return -ENOMEM;
kvm->arch.hpt_virt = hpt;
kvm->arch.hpt_order = order;
/* HPTEs are 2**4 bytes long */
kvm->arch.hpt_npte = 1ul << (order - 4);
/* 128 (2**7) bytes in each HPTEG */
kvm->arch.hpt_mask = (1ul << (order - 7)) - 1;
atomic64_set(&kvm->arch.mmio_update, 0);
npte = 1ul << (order - 4);
/* Allocate reverse map array */
rev = vmalloc(sizeof(struct revmap_entry) * kvm->arch.hpt_npte);
rev = vmalloc(sizeof(struct revmap_entry) * npte);
if (!rev) {
pr_err("kvmppc_alloc_hpt: Couldn't alloc reverse map array\n");
goto out_freehpt;
pr_err("kvmppc_allocate_hpt: Couldn't alloc reverse map array\n");
if (cma)
kvm_free_hpt_cma(page, 1 << (order - PAGE_SHIFT));
else
free_pages(hpt, order - PAGE_SHIFT);
return -ENOMEM;
}
kvm->arch.revmap = rev;
kvm->arch.sdr1 = __pa(hpt) | (order - 18);
pr_info("KVM guest htab at %lx (order %ld), LPID %x\n",
hpt, order, kvm->arch.lpid);
info->order = order;
info->virt = hpt;
info->cma = cma;
info->rev = rev;
if (htab_orderp)
*htab_orderp = order;
return 0;
out_freehpt:
if (kvm->arch.hpt_cma_alloc)
kvm_release_hpt(page, 1 << (order - PAGE_SHIFT));
else
free_pages(hpt, order - PAGE_SHIFT);
return -ENOMEM;
}
long kvmppc_alloc_reset_hpt(struct kvm *kvm, u32 *htab_orderp)
void kvmppc_set_hpt(struct kvm *kvm, struct kvm_hpt_info *info)
{
atomic64_set(&kvm->arch.mmio_update, 0);
kvm->arch.hpt = *info;
kvm->arch.sdr1 = __pa(info->virt) | (info->order - 18);
pr_debug("KVM guest htab at %lx (order %ld), LPID %x\n",
info->virt, (long)info->order, kvm->arch.lpid);
}
long kvmppc_alloc_reset_hpt(struct kvm *kvm, int order)
{
long err = -EBUSY;
long order;
struct kvm_hpt_info info;
if (kvm_is_radix(kvm))
return -EINVAL;
@ -132,36 +149,44 @@ long kvmppc_alloc_reset_hpt(struct kvm *kvm, u32 *htab_orderp)
goto out;
}
}
if (kvm->arch.hpt_virt) {
order = kvm->arch.hpt_order;
if (kvm->arch.hpt.order == order) {
/* We already have a suitable HPT */
/* Set the entire HPT to 0, i.e. invalid HPTEs */
memset((void *)kvm->arch.hpt_virt, 0, 1ul << order);
memset((void *)kvm->arch.hpt.virt, 0, 1ul << order);
/*
* Reset all the reverse-mapping chains for all memslots
*/
kvmppc_rmap_reset(kvm);
/* Ensure that each vcpu will flush its TLB on next entry. */
cpumask_setall(&kvm->arch.need_tlb_flush);
*htab_orderp = order;
err = 0;
} else {
err = kvmppc_alloc_hpt(kvm, htab_orderp);
order = *htab_orderp;
goto out;
}
out:
if (kvm->arch.hpt.virt)
kvmppc_free_hpt(&kvm->arch.hpt);
err = kvmppc_allocate_hpt(&info, order);
if (err < 0)
goto out;
kvmppc_set_hpt(kvm, &info);
out:
mutex_unlock(&kvm->lock);
return err;
}
void kvmppc_free_hpt(struct kvm *kvm)
void kvmppc_free_hpt(struct kvm_hpt_info *info)
{
vfree(kvm->arch.revmap);
if (kvm->arch.hpt_cma_alloc)
kvm_release_hpt(virt_to_page(kvm->arch.hpt_virt),
1 << (kvm->arch.hpt_order - PAGE_SHIFT));
else if (kvm->arch.hpt_virt)
free_pages(kvm->arch.hpt_virt,
kvm->arch.hpt_order - PAGE_SHIFT);
vfree(info->rev);
if (info->cma)
kvm_free_hpt_cma(virt_to_page(info->virt),
1 << (info->order - PAGE_SHIFT));
else if (info->virt)
free_pages(info->virt, info->order - PAGE_SHIFT);
info->virt = 0;
info->order = 0;
}
/* Bits in first HPTE dword for pagesize 4k, 64k or 16M */
@ -196,8 +221,8 @@ void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot,
if (npages > 1ul << (40 - porder))
npages = 1ul << (40 - porder);
/* Can't use more than 1 HPTE per HPTEG */
if (npages > kvm->arch.hpt_mask + 1)
npages = kvm->arch.hpt_mask + 1;
if (npages > kvmppc_hpt_mask(&kvm->arch.hpt) + 1)
npages = kvmppc_hpt_mask(&kvm->arch.hpt) + 1;
hp0 = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) |
HPTE_V_BOLTED | hpte0_pgsize_encoding(psize);
@ -207,7 +232,8 @@ void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot,
for (i = 0; i < npages; ++i) {
addr = i << porder;
/* can't use hpt_hash since va > 64 bits */
hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & kvm->arch.hpt_mask;
hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25)))
& kvmppc_hpt_mask(&kvm->arch.hpt);
/*
* We assume that the hash table is empty and no
* vcpus are using it at this stage. Since we create
@ -340,11 +366,11 @@ static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
preempt_enable();
return -ENOENT;
}
hptep = (__be64 *)(kvm->arch.hpt_virt + (index << 4));
hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4));
v = orig_v = be64_to_cpu(hptep[0]) & ~HPTE_V_HVLOCK;
if (cpu_has_feature(CPU_FTR_ARCH_300))
v = hpte_new_to_old_v(v, be64_to_cpu(hptep[1]));
gr = kvm->arch.revmap[index].guest_rpte;
gr = kvm->arch.hpt.rev[index].guest_rpte;
unlock_hpte(hptep, orig_v);
preempt_enable();
@ -485,8 +511,8 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
}
}
index = vcpu->arch.pgfault_index;
hptep = (__be64 *)(kvm->arch.hpt_virt + (index << 4));
rev = &kvm->arch.revmap[index];
hptep = (__be64 *)(kvm->arch.hpt.virt + (index << 4));
rev = &kvm->arch.hpt.rev[index];
preempt_disable();
while (!try_lock_hpte(hptep, HPTE_V_HVLOCK))
cpu_relax();
@ -745,13 +771,53 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
return kvm_handle_hva_range(kvm, hva, hva + 1, handler);
}
/* Must be called with both HPTE and rmap locked */
static void kvmppc_unmap_hpte(struct kvm *kvm, unsigned long i,
unsigned long *rmapp, unsigned long gfn)
{
__be64 *hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4));
struct revmap_entry *rev = kvm->arch.hpt.rev;
unsigned long j, h;
unsigned long ptel, psize, rcbits;
j = rev[i].forw;
if (j == i) {
/* chain is now empty */
*rmapp &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX);
} else {
/* remove i from chain */
h = rev[i].back;
rev[h].forw = j;
rev[j].back = h;
rev[i].forw = rev[i].back = i;
*rmapp = (*rmapp & ~KVMPPC_RMAP_INDEX) | j;
}
/* Now check and modify the HPTE */
ptel = rev[i].guest_rpte;
psize = hpte_page_size(be64_to_cpu(hptep[0]), ptel);
if ((be64_to_cpu(hptep[0]) & HPTE_V_VALID) &&
hpte_rpn(ptel, psize) == gfn) {
hptep[0] |= cpu_to_be64(HPTE_V_ABSENT);
kvmppc_invalidate_hpte(kvm, hptep, i);
hptep[1] &= ~cpu_to_be64(HPTE_R_KEY_HI | HPTE_R_KEY_LO);
/* Harvest R and C */
rcbits = be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C);
*rmapp |= rcbits << KVMPPC_RMAP_RC_SHIFT;
if (rcbits & HPTE_R_C)
kvmppc_update_rmap_change(rmapp, psize);
if (rcbits & ~rev[i].guest_rpte) {
rev[i].guest_rpte = ptel | rcbits;
note_hpte_modification(kvm, &rev[i]);
}
}
}
static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn)
{
struct revmap_entry *rev = kvm->arch.revmap;
unsigned long h, i, j;
unsigned long i;
__be64 *hptep;
unsigned long ptel, psize, rcbits;
unsigned long *rmapp;
rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
@ -768,7 +834,7 @@ static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
* rmap chain lock.
*/
i = *rmapp & KVMPPC_RMAP_INDEX;
hptep = (__be64 *) (kvm->arch.hpt_virt + (i << 4));
hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4));
if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) {
/* unlock rmap before spinning on the HPTE lock */
unlock_rmap(rmapp);
@ -776,37 +842,8 @@ static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
cpu_relax();
continue;
}
j = rev[i].forw;
if (j == i) {
/* chain is now empty */
*rmapp &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX);
} else {
/* remove i from chain */
h = rev[i].back;
rev[h].forw = j;
rev[j].back = h;
rev[i].forw = rev[i].back = i;
*rmapp = (*rmapp & ~KVMPPC_RMAP_INDEX) | j;
}
/* Now check and modify the HPTE */
ptel = rev[i].guest_rpte;
psize = hpte_page_size(be64_to_cpu(hptep[0]), ptel);
if ((be64_to_cpu(hptep[0]) & HPTE_V_VALID) &&
hpte_rpn(ptel, psize) == gfn) {
hptep[0] |= cpu_to_be64(HPTE_V_ABSENT);
kvmppc_invalidate_hpte(kvm, hptep, i);
hptep[1] &= ~cpu_to_be64(HPTE_R_KEY_HI | HPTE_R_KEY_LO);
/* Harvest R and C */
rcbits = be64_to_cpu(hptep[1]) & (HPTE_R_R | HPTE_R_C);
*rmapp |= rcbits << KVMPPC_RMAP_RC_SHIFT;
if (rcbits & HPTE_R_C)
kvmppc_update_rmap_change(rmapp, psize);
if (rcbits & ~rev[i].guest_rpte) {
rev[i].guest_rpte = ptel | rcbits;
note_hpte_modification(kvm, &rev[i]);
}
}
kvmppc_unmap_hpte(kvm, i, rmapp, gfn);
unlock_rmap(rmapp);
__unlock_hpte(hptep, be64_to_cpu(hptep[0]));
}
@ -860,7 +897,7 @@ void kvmppc_core_flush_memslot_hv(struct kvm *kvm,
static int kvm_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn)
{
struct revmap_entry *rev = kvm->arch.revmap;
struct revmap_entry *rev = kvm->arch.hpt.rev;
unsigned long head, i, j;
__be64 *hptep;
int ret = 0;
@ -880,7 +917,7 @@ static int kvm_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
i = head = *rmapp & KVMPPC_RMAP_INDEX;
do {
hptep = (__be64 *) (kvm->arch.hpt_virt + (i << 4));
hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4));
j = rev[i].forw;
/* If this HPTE isn't referenced, ignore it */
@ -923,7 +960,7 @@ int kvm_age_hva_hv(struct kvm *kvm, unsigned long start, unsigned long end)
static int kvm_test_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gfn)
{
struct revmap_entry *rev = kvm->arch.revmap;
struct revmap_entry *rev = kvm->arch.hpt.rev;
unsigned long head, i, j;
unsigned long *hp;
int ret = 1;
@ -940,7 +977,7 @@ static int kvm_test_age_rmapp(struct kvm *kvm, struct kvm_memory_slot *memslot,
if (*rmapp & KVMPPC_RMAP_PRESENT) {
i = head = *rmapp & KVMPPC_RMAP_INDEX;
do {
hp = (unsigned long *)(kvm->arch.hpt_virt + (i << 4));
hp = (unsigned long *)(kvm->arch.hpt.virt + (i << 4));
j = rev[i].forw;
if (be64_to_cpu(hp[1]) & HPTE_R_R)
goto out;
@ -980,7 +1017,7 @@ static int vcpus_running(struct kvm *kvm)
*/
static int kvm_test_clear_dirty_npages(struct kvm *kvm, unsigned long *rmapp)
{
struct revmap_entry *rev = kvm->arch.revmap;
struct revmap_entry *rev = kvm->arch.hpt.rev;
unsigned long head, i, j;
unsigned long n;
unsigned long v, r;
@ -1005,7 +1042,7 @@ static int kvm_test_clear_dirty_npages(struct kvm *kvm, unsigned long *rmapp)
i = head = *rmapp & KVMPPC_RMAP_INDEX;
do {
unsigned long hptep1;
hptep = (__be64 *) (kvm->arch.hpt_virt + (i << 4));
hptep = (__be64 *) (kvm->arch.hpt.virt + (i << 4));
j = rev[i].forw;
/*
@ -1171,6 +1208,363 @@ void kvmppc_unpin_guest_page(struct kvm *kvm, void *va, unsigned long gpa,
srcu_read_unlock(&kvm->srcu, srcu_idx);
}
/*
* HPT resizing
*/
static int resize_hpt_allocate(struct kvm_resize_hpt *resize)
{
int rc;
rc = kvmppc_allocate_hpt(&resize->hpt, resize->order);
if (rc < 0)
return rc;
resize_hpt_debug(resize, "resize_hpt_allocate(): HPT @ 0x%lx\n",
resize->hpt.virt);
return 0;
}
static unsigned long resize_hpt_rehash_hpte(struct kvm_resize_hpt *resize,
unsigned long idx)
{
struct kvm *kvm = resize->kvm;
struct kvm_hpt_info *old = &kvm->arch.hpt;
struct kvm_hpt_info *new = &resize->hpt;
unsigned long old_hash_mask = (1ULL << (old->order - 7)) - 1;
unsigned long new_hash_mask = (1ULL << (new->order - 7)) - 1;
__be64 *hptep, *new_hptep;
unsigned long vpte, rpte, guest_rpte;
int ret;
struct revmap_entry *rev;
unsigned long apsize, psize, avpn, pteg, hash;
unsigned long new_idx, new_pteg, replace_vpte;
hptep = (__be64 *)(old->virt + (idx << 4));
/* Guest is stopped, so new HPTEs can't be added or faulted
* in, only unmapped or altered by host actions. So, it's
* safe to check this before we take the HPTE lock */
vpte = be64_to_cpu(hptep[0]);
if (!(vpte & HPTE_V_VALID) && !(vpte & HPTE_V_ABSENT))
return 0; /* nothing to do */
while (!try_lock_hpte(hptep, HPTE_V_HVLOCK))
cpu_relax();
vpte = be64_to_cpu(hptep[0]);
ret = 0;
if (!(vpte & HPTE_V_VALID) && !(vpte & HPTE_V_ABSENT))
/* Nothing to do */
goto out;
/* Unmap */
rev = &old->rev[idx];
guest_rpte = rev->guest_rpte;
ret = -EIO;
apsize = hpte_page_size(vpte, guest_rpte);
if (!apsize)
goto out;
if (vpte & HPTE_V_VALID) {
unsigned long gfn = hpte_rpn(guest_rpte, apsize);
int srcu_idx = srcu_read_lock(&kvm->srcu);
struct kvm_memory_slot *memslot =
__gfn_to_memslot(kvm_memslots(kvm), gfn);
if (memslot) {
unsigned long *rmapp;
rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
lock_rmap(rmapp);
kvmppc_unmap_hpte(kvm, idx, rmapp, gfn);
unlock_rmap(rmapp);
}
srcu_read_unlock(&kvm->srcu, srcu_idx);
}
/* Reload PTE after unmap */
vpte = be64_to_cpu(hptep[0]);
BUG_ON(vpte & HPTE_V_VALID);
BUG_ON(!(vpte & HPTE_V_ABSENT));
ret = 0;
if (!(vpte & HPTE_V_BOLTED))
goto out;
rpte = be64_to_cpu(hptep[1]);
psize = hpte_base_page_size(vpte, rpte);
avpn = HPTE_V_AVPN_VAL(vpte) & ~((psize - 1) >> 23);
pteg = idx / HPTES_PER_GROUP;
if (vpte & HPTE_V_SECONDARY)
pteg = ~pteg;
if (!(vpte & HPTE_V_1TB_SEG)) {
unsigned long offset, vsid;
/* We only have 28 - 23 bits of offset in avpn */
offset = (avpn & 0x1f) << 23;
vsid = avpn >> 5;
/* We can find more bits from the pteg value */
if (psize < (1ULL << 23))
offset |= ((vsid ^ pteg) & old_hash_mask) * psize;
hash = vsid ^ (offset / psize);
} else {
unsigned long offset, vsid;
/* We only have 40 - 23 bits of seg_off in avpn */
offset = (avpn & 0x1ffff) << 23;
vsid = avpn >> 17;
if (psize < (1ULL << 23))
offset |= ((vsid ^ (vsid << 25) ^ pteg) & old_hash_mask) * psize;
hash = vsid ^ (vsid << 25) ^ (offset / psize);
}
new_pteg = hash & new_hash_mask;
if (vpte & HPTE_V_SECONDARY) {
BUG_ON(~pteg != (hash & old_hash_mask));
new_pteg = ~new_pteg;
} else {
BUG_ON(pteg != (hash & old_hash_mask));
}
new_idx = new_pteg * HPTES_PER_GROUP + (idx % HPTES_PER_GROUP);
new_hptep = (__be64 *)(new->virt + (new_idx << 4));
replace_vpte = be64_to_cpu(new_hptep[0]);
if (replace_vpte & (HPTE_V_VALID | HPTE_V_ABSENT)) {
BUG_ON(new->order >= old->order);
if (replace_vpte & HPTE_V_BOLTED) {
if (vpte & HPTE_V_BOLTED)
/* Bolted collision, nothing we can do */
ret = -ENOSPC;
/* Discard the new HPTE */
goto out;
}
/* Discard the previous HPTE */
}
new_hptep[1] = cpu_to_be64(rpte);
new->rev[new_idx].guest_rpte = guest_rpte;
/* No need for a barrier, since new HPT isn't active */
new_hptep[0] = cpu_to_be64(vpte);
unlock_hpte(new_hptep, vpte);
out:
unlock_hpte(hptep, vpte);
return ret;
}
static int resize_hpt_rehash(struct kvm_resize_hpt *resize)
{
struct kvm *kvm = resize->kvm;
unsigned long i;
int rc;
/*
* resize_hpt_rehash_hpte() doesn't handle the new-format HPTEs
* that POWER9 uses, and could well hit a BUG_ON on POWER9.
*/
if (cpu_has_feature(CPU_FTR_ARCH_300))
return -EIO;
for (i = 0; i < kvmppc_hpt_npte(&kvm->arch.hpt); i++) {
rc = resize_hpt_rehash_hpte(resize, i);
if (rc != 0)
return rc;
}
return 0;
}
static void resize_hpt_pivot(struct kvm_resize_hpt *resize)
{
struct kvm *kvm = resize->kvm;
struct kvm_hpt_info hpt_tmp;
/* Exchange the pending tables in the resize structure with
* the active tables */
resize_hpt_debug(resize, "resize_hpt_pivot()\n");
spin_lock(&kvm->mmu_lock);
asm volatile("ptesync" : : : "memory");
hpt_tmp = kvm->arch.hpt;
kvmppc_set_hpt(kvm, &resize->hpt);
resize->hpt = hpt_tmp;
spin_unlock(&kvm->mmu_lock);
synchronize_srcu_expedited(&kvm->srcu);
resize_hpt_debug(resize, "resize_hpt_pivot() done\n");
}
static void resize_hpt_release(struct kvm *kvm, struct kvm_resize_hpt *resize)
{
BUG_ON(kvm->arch.resize_hpt != resize);
if (!resize)
return;
if (resize->hpt.virt)
kvmppc_free_hpt(&resize->hpt);
kvm->arch.resize_hpt = NULL;
kfree(resize);
}
static void resize_hpt_prepare_work(struct work_struct *work)
{
struct kvm_resize_hpt *resize = container_of(work,
struct kvm_resize_hpt,
work);
struct kvm *kvm = resize->kvm;
int err;
resize_hpt_debug(resize, "resize_hpt_prepare_work(): order = %d\n",
resize->order);
err = resize_hpt_allocate(resize);
mutex_lock(&kvm->lock);
resize->error = err;
resize->prepare_done = true;
mutex_unlock(&kvm->lock);
}
long kvm_vm_ioctl_resize_hpt_prepare(struct kvm *kvm,
struct kvm_ppc_resize_hpt *rhpt)
{
unsigned long flags = rhpt->flags;
unsigned long shift = rhpt->shift;
struct kvm_resize_hpt *resize;
int ret;
if (flags != 0)
return -EINVAL;
if (shift && ((shift < 18) || (shift > 46)))
return -EINVAL;
mutex_lock(&kvm->lock);
resize = kvm->arch.resize_hpt;
if (resize) {
if (resize->order == shift) {
/* Suitable resize in progress */
if (resize->prepare_done) {
ret = resize->error;
if (ret != 0)
resize_hpt_release(kvm, resize);
} else {
ret = 100; /* estimated time in ms */
}
goto out;
}
/* not suitable, cancel it */
resize_hpt_release(kvm, resize);
}
ret = 0;
if (!shift)
goto out; /* nothing to do */
/* start new resize */
resize = kzalloc(sizeof(*resize), GFP_KERNEL);
resize->order = shift;
resize->kvm = kvm;
INIT_WORK(&resize->work, resize_hpt_prepare_work);
kvm->arch.resize_hpt = resize;
schedule_work(&resize->work);
ret = 100; /* estimated time in ms */
out:
mutex_unlock(&kvm->lock);
return ret;
}
static void resize_hpt_boot_vcpu(void *opaque)
{
/* Nothing to do, just force a KVM exit */
}
long kvm_vm_ioctl_resize_hpt_commit(struct kvm *kvm,
struct kvm_ppc_resize_hpt *rhpt)
{
unsigned long flags = rhpt->flags;
unsigned long shift = rhpt->shift;
struct kvm_resize_hpt *resize;
long ret;
if (flags != 0)
return -EINVAL;
if (shift && ((shift < 18) || (shift > 46)))
return -EINVAL;
mutex_lock(&kvm->lock);
resize = kvm->arch.resize_hpt;
/* This shouldn't be possible */
ret = -EIO;
if (WARN_ON(!kvm->arch.hpte_setup_done))
goto out_no_hpt;
/* Stop VCPUs from running while we mess with the HPT */
kvm->arch.hpte_setup_done = 0;
smp_mb();
/* Boot all CPUs out of the guest so they re-read
* hpte_setup_done */
on_each_cpu(resize_hpt_boot_vcpu, NULL, 1);
ret = -ENXIO;
if (!resize || (resize->order != shift))
goto out;
ret = -EBUSY;
if (!resize->prepare_done)
goto out;
ret = resize->error;
if (ret != 0)
goto out;
ret = resize_hpt_rehash(resize);
if (ret != 0)
goto out;
resize_hpt_pivot(resize);
out:
/* Let VCPUs run again */
kvm->arch.hpte_setup_done = 1;
smp_mb();
out_no_hpt:
resize_hpt_release(kvm, resize);
mutex_unlock(&kvm->lock);
return ret;
}
/*
* Functions for reading and writing the hash table via reads and
* writes on a file descriptor.
@ -1311,8 +1705,8 @@ static ssize_t kvm_htab_read(struct file *file, char __user *buf,
flags = ctx->flags;
i = ctx->index;
hptp = (__be64 *)(kvm->arch.hpt_virt + (i * HPTE_SIZE));
revp = kvm->arch.revmap + i;
hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE));
revp = kvm->arch.hpt.rev + i;
lbuf = (unsigned long __user *)buf;
nb = 0;
@ -1327,7 +1721,7 @@ static ssize_t kvm_htab_read(struct file *file, char __user *buf,
/* Skip uninteresting entries, i.e. clean on not-first pass */
if (!first_pass) {
while (i < kvm->arch.hpt_npte &&
while (i < kvmppc_hpt_npte(&kvm->arch.hpt) &&
!hpte_dirty(revp, hptp)) {
++i;
hptp += 2;
@ -1337,7 +1731,7 @@ static ssize_t kvm_htab_read(struct file *file, char __user *buf,
hdr.index = i;
/* Grab a series of valid entries */
while (i < kvm->arch.hpt_npte &&
while (i < kvmppc_hpt_npte(&kvm->arch.hpt) &&
hdr.n_valid < 0xffff &&
nb + HPTE_SIZE < count &&
record_hpte(flags, hptp, hpte, revp, 1, first_pass)) {
@ -1353,7 +1747,7 @@ static ssize_t kvm_htab_read(struct file *file, char __user *buf,
++revp;
}
/* Now skip invalid entries while we can */
while (i < kvm->arch.hpt_npte &&
while (i < kvmppc_hpt_npte(&kvm->arch.hpt) &&
hdr.n_invalid < 0xffff &&
record_hpte(flags, hptp, hpte, revp, 0, first_pass)) {
/* found an invalid entry */
@ -1374,7 +1768,7 @@ static ssize_t kvm_htab_read(struct file *file, char __user *buf,
}
/* Check if we've wrapped around the hash table */
if (i >= kvm->arch.hpt_npte) {
if (i >= kvmppc_hpt_npte(&kvm->arch.hpt)) {
i = 0;
ctx->first_pass = 0;
break;
@ -1433,11 +1827,11 @@ static ssize_t kvm_htab_write(struct file *file, const char __user *buf,
err = -EINVAL;
i = hdr.index;
if (i >= kvm->arch.hpt_npte ||
i + hdr.n_valid + hdr.n_invalid > kvm->arch.hpt_npte)
if (i >= kvmppc_hpt_npte(&kvm->arch.hpt) ||
i + hdr.n_valid + hdr.n_invalid > kvmppc_hpt_npte(&kvm->arch.hpt))
break;
hptp = (__be64 *)(kvm->arch.hpt_virt + (i * HPTE_SIZE));
hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE));
lbuf = (unsigned long __user *)buf;
for (j = 0; j < hdr.n_valid; ++j) {
__be64 hpte_v;
@ -1624,8 +2018,9 @@ static ssize_t debugfs_htab_read(struct file *file, char __user *buf,
kvm = p->kvm;
i = p->hpt_index;
hptp = (__be64 *)(kvm->arch.hpt_virt + (i * HPTE_SIZE));
for (; len != 0 && i < kvm->arch.hpt_npte; ++i, hptp += 2) {
hptp = (__be64 *)(kvm->arch.hpt.virt + (i * HPTE_SIZE));
for (; len != 0 && i < kvmppc_hpt_npte(&kvm->arch.hpt);
++i, hptp += 2) {
if (!(be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)))
continue;
@ -1635,7 +2030,7 @@ static ssize_t debugfs_htab_read(struct file *file, char __user *buf,
cpu_relax();
v = be64_to_cpu(hptp[0]) & ~HPTE_V_HVLOCK;
hr = be64_to_cpu(hptp[1]);
gr = kvm->arch.revmap[i].guest_rpte;
gr = kvm->arch.hpt.rev[i].guest_rpte;
unlock_hpte(hptp, v);
preempt_enable();

1
arch/powerpc/kvm/book3s_64_vio.c
View File

@ -171,6 +171,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
goto fail;
}
ret = -ENOMEM;
stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *),
GFP_KERNEL);
if (!stt)

65
arch/powerpc/kvm/book3s_hv.c
View File

@ -182,7 +182,8 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
++vcpu->stat.halt_wakeup;
}
if (kvmppc_ipi_thread(vcpu->arch.thread_cpu))
cpu = READ_ONCE(vcpu->arch.thread_cpu);
if (cpu >= 0 && kvmppc_ipi_thread(cpu))
return;
/* CPU points to the first thread of the core */
@ -773,12 +774,8 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
}
tvcpu->arch.prodded = 1;
smp_mb();
if (vcpu->arch.ceded) {
if (swait_active(&vcpu->wq)) {
swake_up(&vcpu->wq);
vcpu->stat.halt_wakeup++;
}
}
if (tvcpu->arch.ceded)
kvmppc_fast_vcpu_kick_hv(tvcpu);
break;
case H_CONFER:
target = kvmppc_get_gpr(vcpu, 4);
@ -2665,7 +2662,8 @@ static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc)
int i;
for_each_runnable_thread(i, vcpu, vc) {
if (vcpu->arch.pending_exceptions || !vcpu->arch.ceded)
if (vcpu->arch.pending_exceptions || !vcpu->arch.ceded ||
vcpu->arch.prodded)
return 1;
}
@ -2851,7 +2849,7 @@ static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
break;
n_ceded = 0;
for_each_runnable_thread(i, v, vc) {
if (!v->arch.pending_exceptions)
if (!v->arch.pending_exceptions && !v->arch.prodded)
n_ceded += v->arch.ceded;
else
v->arch.ceded = 0;
@ -3199,12 +3197,23 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
goto out; /* another vcpu beat us to it */
/* Allocate hashed page table (if not done already) and reset it */
if (!kvm->arch.hpt_virt) {
err = kvmppc_alloc_hpt(kvm, NULL);
if (err) {
if (!kvm->arch.hpt.virt) {
int order = KVM_DEFAULT_HPT_ORDER;
struct kvm_hpt_info info;
err = kvmppc_allocate_hpt(&info, order);
/* If we get here, it means userspace didn't specify a
* size explicitly. So, try successively smaller
* sizes if the default failed. */
while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER)
err = kvmppc_allocate_hpt(&info, order);
if (err < 0) {
pr_err("KVM: Couldn't alloc HPT\n");
goto out;
}
kvmppc_set_hpt(kvm, &info);
}
/* Look up the memslot for guest physical address 0 */
@ -3413,6 +3422,9 @@ static int kvmppc_core_init_vm_hv(struct kvm *kvm)
kvm->arch.lpcr = lpcr;
/* Initialization for future HPT resizes */
kvm->arch.resize_hpt = NULL;
/*
* Work out how many sets the TLB has, for the use of
* the TLB invalidation loop in book3s_hv_rmhandlers.S.
@ -3469,7 +3481,7 @@ static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
if (kvm_is_radix(kvm))
kvmppc_free_radix(kvm);
else
kvmppc_free_hpt(kvm);
kvmppc_free_hpt(&kvm->arch.hpt);
kvmppc_free_pimap(kvm);
}
@ -3695,12 +3707,9 @@ static long kvm_arch_vm_ioctl_hv(struct file *filp,
r = -EFAULT;
if (get_user(htab_order, (u32 __user *)argp))
break;
r = kvmppc_alloc_reset_hpt(kvm, &htab_order);
r = kvmppc_alloc_reset_hpt(kvm, htab_order);
if (r)
break;
r = -EFAULT;
if (put_user(htab_order, (u32 __user *)argp))
break;
r = 0;
break;
}
@ -3715,6 +3724,28 @@ static long kvm_arch_vm_ioctl_hv(struct file *filp,
break;
}
case KVM_PPC_RESIZE_HPT_PREPARE: {
struct kvm_ppc_resize_hpt rhpt;
r = -EFAULT;
if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
break;
r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt);
break;
}
case KVM_PPC_RESIZE_HPT_COMMIT: {
struct kvm_ppc_resize_hpt rhpt;
r = -EFAULT;
if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
break;
r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt);
break;
}
default:
r = -ENOTTY;
}

8
arch/powerpc/kvm/book3s_hv_builtin.c
View File

@ -52,19 +52,19 @@ static int __init early_parse_kvm_cma_resv(char *p)
}
early_param("kvm_cma_resv_ratio", early_parse_kvm_cma_resv);
struct page *kvm_alloc_hpt(unsigned long nr_pages)
struct page *kvm_alloc_hpt_cma(unsigned long nr_pages)
{
VM_BUG_ON(order_base_2(nr_pages) < KVM_CMA_CHUNK_ORDER - PAGE_SHIFT);
return cma_alloc(kvm_cma, nr_pages, order_base_2(HPT_ALIGN_PAGES));
}
EXPORT_SYMBOL_GPL(kvm_alloc_hpt);
EXPORT_SYMBOL_GPL(kvm_alloc_hpt_cma);
void kvm_release_hpt(struct page *page, unsigned long nr_pages)
void kvm_free_hpt_cma(struct page *page, unsigned long nr_pages)
{
cma_release(kvm_cma, page, nr_pages);
}
EXPORT_SYMBOL_GPL(kvm_release_hpt);
EXPORT_SYMBOL_GPL(kvm_free_hpt_cma);
/**
* kvm_cma_reserve() - reserve area for kvm hash pagetable

62
arch/powerpc/kvm/book3s_hv_rm_mmu.c
View File

@ -86,10 +86,10 @@ void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev,
if (*rmap & KVMPPC_RMAP_PRESENT) {
i = *rmap & KVMPPC_RMAP_INDEX;
head = &kvm->arch.revmap[i];
head = &kvm->arch.hpt.rev[i];
if (realmode)
head = real_vmalloc_addr(head);
tail = &kvm->arch.revmap[head->back];
tail = &kvm->arch.hpt.rev[head->back];
if (realmode)
tail = real_vmalloc_addr(tail);
rev->forw = i;
@ -154,8 +154,8 @@ static void remove_revmap_chain(struct kvm *kvm, long pte_index,
lock_rmap(rmap);
head = *rmap & KVMPPC_RMAP_INDEX;
next = real_vmalloc_addr(&kvm->arch.revmap[rev->forw]);
prev = real_vmalloc_addr(&kvm->arch.revmap[rev->back]);
next = real_vmalloc_addr(&kvm->arch.hpt.rev[rev->forw]);
prev = real_vmalloc_addr(&kvm->arch.hpt.rev[rev->back]);
next->back = rev->back;
prev->forw = rev->forw;
if (head == pte_index) {
@ -292,11 +292,11 @@ long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags,
/* Find and lock the HPTEG slot to use */
do_insert:
if (pte_index >= kvm->arch.hpt_npte)
if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
return H_PARAMETER;
if (likely((flags & H_EXACT) == 0)) {
pte_index &= ~7UL;
hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4));
hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
for (i = 0; i < 8; ++i) {
if ((be64_to_cpu(*hpte) & HPTE_V_VALID) == 0 &&
try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID |
@ -327,7 +327,7 @@ long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags,
}
pte_index += i;
} else {
hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4));
hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID |
HPTE_V_ABSENT)) {
/* Lock the slot and check again */
@ -344,7 +344,7 @@ long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags,
}
/* Save away the guest's idea of the second HPTE dword */
rev = &kvm->arch.revmap[pte_index];
rev = &kvm->arch.hpt.rev[pte_index];
if (realmode)
rev = real_vmalloc_addr(rev);
if (rev) {
@ -469,9 +469,9 @@ long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
if (kvm_is_radix(kvm))
return H_FUNCTION;
if (pte_index >= kvm->arch.hpt_npte)
if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
return H_PARAMETER;
hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4));
hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
cpu_relax();
pte = orig_pte = be64_to_cpu(hpte[0]);
@ -487,7 +487,7 @@ long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
return H_NOT_FOUND;
}
rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
v = pte & ~HPTE_V_HVLOCK;
if (v & HPTE_V_VALID) {
hpte[0] &= ~cpu_to_be64(HPTE_V_VALID);
@ -557,13 +557,13 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
break;
}
if (req != 1 || flags == 3 ||
pte_index >= kvm->arch.hpt_npte) {
pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt)) {
/* parameter error */
args[j] = ((0xa0 | flags) << 56) + pte_index;
ret = H_PARAMETER;
break;
}
hp = (__be64 *) (kvm->arch.hpt_virt + (pte_index << 4));
hp = (__be64 *) (kvm->arch.hpt.virt + (pte_index << 4));
/* to avoid deadlock, don't spin except for first */
if (!try_lock_hpte(hp, HPTE_V_HVLOCK)) {
if (n)
@ -600,7 +600,7 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
}
args[j] = ((0x80 | flags) << 56) + pte_index;
rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
note_hpte_modification(kvm, rev);
if (!(hp0 & HPTE_V_VALID)) {
@ -657,10 +657,10 @@ long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
if (kvm_is_radix(kvm))
return H_FUNCTION;
if (pte_index >= kvm->arch.hpt_npte)
if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
return H_PARAMETER;
hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4));
hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
cpu_relax();
v = pte_v = be64_to_cpu(hpte[0]);
@ -680,7 +680,7 @@ long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
/* Update guest view of 2nd HPTE dword */
mask = HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N |
HPTE_R_KEY_HI | HPTE_R_KEY_LO;
rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
if (rev) {
r = (rev->guest_rpte & ~mask) | bits;
rev->guest_rpte = r;
@ -728,15 +728,15 @@ long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags,
if (kvm_is_radix(kvm))
return H_FUNCTION;
if (pte_index >= kvm->arch.hpt_npte)
if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
return H_PARAMETER;
if (flags & H_READ_4) {
pte_index &= ~3;
n = 4;
}
rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
for (i = 0; i < n; ++i, ++pte_index) {
hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4));
hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
v = be64_to_cpu(hpte[0]) & ~HPTE_V_HVLOCK;
r = be64_to_cpu(hpte[1]);
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
@ -769,11 +769,11 @@ long kvmppc_h_clear_ref(struct kvm_vcpu *vcpu, unsigned long flags,
if (kvm_is_radix(kvm))
return H_FUNCTION;
if (pte_index >= kvm->arch.hpt_npte)
if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
return H_PARAMETER;
rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4));
rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
cpu_relax();
v = be64_to_cpu(hpte[0]);
@ -817,11 +817,11 @@ long kvmppc_h_clear_mod(struct kvm_vcpu *vcpu, unsigned long flags,
if (kvm_is_radix(kvm))
return H_FUNCTION;
if (pte_index >= kvm->arch.hpt_npte)
if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
return H_PARAMETER;
rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
hpte = (__be64 *)(kvm->arch.hpt_virt + (pte_index << 4));
rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
cpu_relax();
v = be64_to_cpu(hpte[0]);
@ -970,7 +970,7 @@ long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, unsigned long slb_v,
somask = (1UL << 28) - 1;
vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT;
}
hash = (vsid ^ ((eaddr & somask) >> pshift)) & kvm->arch.hpt_mask;
hash = (vsid ^ ((eaddr & somask) >> pshift)) & kvmppc_hpt_mask(&kvm->arch.hpt);
avpn = slb_v & ~(somask >> 16); /* also includes B */
avpn |= (eaddr & somask) >> 16;
@ -981,7 +981,7 @@ long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, unsigned long slb_v,
val |= avpn;
for (;;) {
hpte = (__be64 *)(kvm->arch.hpt_virt + (hash << 7));
hpte = (__be64 *)(kvm->arch.hpt.virt + (hash << 7));
for (i = 0; i < 16; i += 2) {
/* Read the PTE racily */
@ -1017,7 +1017,7 @@ long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, unsigned long slb_v,
if (val & HPTE_V_SECONDARY)
break;
val |= HPTE_V_SECONDARY;
hash = hash ^ kvm->arch.hpt_mask;
hash = hash ^ kvmppc_hpt_mask(&kvm->arch.hpt);
}
return -1;
}
@ -1066,14 +1066,14 @@ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr,
return status; /* there really was no HPTE */
return 0; /* for prot fault, HPTE disappeared */
}
hpte = (__be64 *)(kvm->arch.hpt_virt + (index << 4));
hpte = (__be64 *)(kvm->arch.hpt.virt + (index << 4));
v = orig_v = be64_to_cpu(hpte[0]) & ~HPTE_V_HVLOCK;
r = be64_to_cpu(hpte[1]);
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
v = hpte_new_to_old_v(v, r);
r = hpte_new_to_old_r(r);
}
rev = real_vmalloc_addr(&kvm->arch.revmap[index]);
rev = real_vmalloc_addr(&kvm->arch.hpt.rev[index]);
gr = rev->guest_rpte;
unlock_hpte(hpte, orig_v);

138
arch/powerpc/kvm/book3s_hv_rm_xics.c
View File

@ -35,7 +35,7 @@ int kvm_irq_bypass = 1;
EXPORT_SYMBOL(kvm_irq_bypass);
static void icp_rm_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
u32 new_irq);
u32 new_irq, bool check_resend);
static int xics_opal_set_server(unsigned int hw_irq, int server_cpu);
/* -- ICS routines -- */
@ -44,20 +44,12 @@ static void ics_rm_check_resend(struct kvmppc_xics *xics,
{
int i;
arch_spin_lock(&ics->lock);
for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
struct ics_irq_state *state = &ics->irq_state[i];
if (!state->resend)
continue;
arch_spin_unlock(&ics->lock);
icp_rm_deliver_irq(xics, icp, state->number);
arch_spin_lock(&ics->lock);
if (state->resend)
icp_rm_deliver_irq(xics, icp, state->number, true);
}
arch_spin_unlock(&ics->lock);
}
/* -- ICP routines -- */
@ -288,7 +280,7 @@ static bool icp_rm_try_to_deliver(struct kvmppc_icp *icp, u32 irq, u8 priority,
}
static void icp_rm_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
u32 new_irq)
u32 new_irq, bool check_resend)
{
struct ics_irq_state *state;
struct kvmppc_ics *ics;
@ -333,6 +325,10 @@ static void icp_rm_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
}
}
if (check_resend)
if (!state->resend)
goto out;
/* Clear the resend bit of that interrupt */
state->resend = 0;
@ -378,7 +374,9 @@ static void icp_rm_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
*/
if (reject && reject != XICS_IPI) {
arch_spin_unlock(&ics->lock);
icp->n_reject++;
new_irq = reject;
check_resend = 0;
goto again;
}
} else {
@ -386,9 +384,15 @@ static void icp_rm_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
* We failed to deliver the interrupt we need to set the
* resend map bit and mark the ICS state as needing a resend
*/
set_bit(ics->icsid, icp->resend_map);
state->resend = 1;
/*
* Make sure when checking resend, we don't miss the resend
* if resend_map bit is seen and cleared.
*/
smp_wmb();
set_bit(ics->icsid, icp->resend_map);
/*
* If the need_resend flag got cleared in the ICP some time
* between icp_rm_try_to_deliver() atomic update and now, then
@ -397,7 +401,9 @@ static void icp_rm_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
*/
smp_mb();
if (!icp->state.need_resend) {
state->resend = 0;
arch_spin_unlock(&ics->lock);
check_resend = 0;
goto again;
}
}
@ -592,7 +598,7 @@ int kvmppc_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,
/* Handle reject in real mode */
if (reject && reject != XICS_IPI) {
this_icp->n_reject++;
icp_rm_deliver_irq(xics, icp, reject);
icp_rm_deliver_irq(xics, icp, reject, false);
}
/* Handle resends in real mode */
@ -660,59 +666,45 @@ int kvmppc_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr)
*/
if (reject && reject != XICS_IPI) {
icp->n_reject++;
icp_rm_deliver_irq(xics, icp, reject);
icp_rm_deliver_irq(xics, icp, reject, false);
}
bail:
return check_too_hard(xics, icp);
}
int kvmppc_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
static int ics_rm_eoi(struct kvm_vcpu *vcpu, u32 irq)
{
struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
struct kvmppc_icp *icp = vcpu->arch.icp;
struct kvmppc_ics *ics;
struct ics_irq_state *state;
u32 irq = xirr & 0x00ffffff;
u16 src;
if (!xics || !xics->real_mode)
return H_TOO_HARD;
u32 pq_old, pq_new;
/*
* ICP State: EOI
* ICS EOI handling: For LSI, if P bit is still set, we need to
* resend it.
*
* Note: If EOI is incorrectly used by SW to lower the CPPR
* value (ie more favored), we do not check for rejection of
* a pending interrupt, this is a SW error and PAPR sepcifies
* that we don't have to deal with it.
*
* The sending of an EOI to the ICS is handled after the
* CPPR update
*
* ICP State: Down_CPPR which we handle
* in a separate function as it's shared with H_CPPR.
* For MSI, we move Q bit into P (and clear Q). If it is set,
* resend it.
*/
icp_rm_down_cppr(xics, icp, xirr >> 24);
/* IPIs have no EOI */
if (irq == XICS_IPI)
goto bail;
/*
* EOI handling: If the interrupt is still asserted, we need to
* resend it. We can take a lockless "peek" at the ICS state here.
*
* "Message" interrupts will never have "asserted" set
*/
ics = kvmppc_xics_find_ics(xics, irq, &src);
if (!ics)
goto bail;
state = &ics->irq_state[src];
/* Still asserted, resend it */
if (state->asserted) {
icp->n_reject++;
icp_rm_deliver_irq(xics, icp, irq);
}
if (state->lsi)
pq_new = state->pq_state;
else
do {
pq_old = state->pq_state;
pq_new = pq_old >> 1;
} while (cmpxchg(&state->pq_state, pq_old, pq_new) != pq_old);
if (pq_new & PQ_PRESENTED)
icp_rm_deliver_irq(xics, NULL, irq, false);
if (!hlist_empty(&vcpu->kvm->irq_ack_notifier_list)) {
icp->rm_action |= XICS_RM_NOTIFY_EOI;
@ -733,10 +725,43 @@ int kvmppc_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
state->intr_cpu = -1;
}
}
bail:
return check_too_hard(xics, icp);
}
int kvmppc_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
{
struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
struct kvmppc_icp *icp = vcpu->arch.icp;
u32 irq = xirr & 0x00ffffff;
if (!xics || !xics->real_mode)
return H_TOO_HARD;
/*
* ICP State: EOI
*
* Note: If EOI is incorrectly used by SW to lower the CPPR
* value (ie more favored), we do not check for rejection of
* a pending interrupt, this is a SW error and PAPR specifies
* that we don't have to deal with it.
*
* The sending of an EOI to the ICS is handled after the
* CPPR update
*
* ICP State: Down_CPPR which we handle
* in a separate function as it's shared with H_CPPR.
*/
icp_rm_down_cppr(xics, icp, xirr >> 24);
/* IPIs have no EOI */
if (irq == XICS_IPI)
return check_too_hard(xics, icp);
return ics_rm_eoi(vcpu, irq);
}
unsigned long eoi_rc;
static void icp_eoi(struct irq_chip *c, u32 hwirq, __be32 xirr, bool *again)
@ -823,14 +848,33 @@ long kvmppc_deliver_irq_passthru(struct kvm_vcpu *vcpu,
{
struct kvmppc_xics *xics;
struct kvmppc_icp *icp;
struct kvmppc_ics *ics;
struct ics_irq_state *state;
u32 irq;
u16 src;
u32 pq_old, pq_new;
irq = irq_map->v_hwirq;
xics = vcpu->kvm->arch.xics;
icp = vcpu->arch.icp;
kvmppc_rm_handle_irq_desc(irq_map->desc);
icp_rm_deliver_irq(xics, icp, irq);
ics = kvmppc_xics_find_ics(xics, irq, &src);
if (!ics)
return 2;
state = &ics->irq_state[src];
/* only MSIs register bypass producers, so it must be MSI here */
do {
pq_old = state->pq_state;
pq_new = ((pq_old << 1) & 3) | PQ_PRESENTED;
} while (cmpxchg(&state->pq_state, pq_old, pq_new) != pq_old);
/* Test P=1, Q=0, this is the only case where we present */
if (pq_new == PQ_PRESENTED)
icp_rm_deliver_irq(xics, icp, irq, false);
/* EOI the interrupt */
icp_eoi(irq_desc_get_chip(irq_map->desc), irq_map->r_hwirq, xirr,

130
arch/powerpc/kvm/book3s_pr.c
View File

@ -902,6 +902,69 @@ static void kvmppc_clear_debug(struct kvm_vcpu *vcpu)
}
}
static int kvmppc_exit_pr_progint(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int exit_nr)
{
enum emulation_result er;
ulong flags;
u32 last_inst;
int emul, r;
/*
* shadow_srr1 only contains valid flags if we came here via a program
* exception. The other exceptions (emulation assist, FP unavailable,
* etc.) do not provide flags in SRR1, so use an illegal-instruction
* exception when injecting a program interrupt into the guest.
*/
if (exit_nr == BOOK3S_INTERRUPT_PROGRAM)
flags = vcpu->arch.shadow_srr1 & 0x1f0000ull;
else
flags = SRR1_PROGILL;
emul = kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
if (emul != EMULATE_DONE)
return RESUME_GUEST;
if (kvmppc_get_msr(vcpu) & MSR_PR) {
#ifdef EXIT_DEBUG
pr_info("Userspace triggered 0x700 exception at\n 0x%lx (0x%x)\n",
kvmppc_get_pc(vcpu), last_inst);
#endif
if ((last_inst & 0xff0007ff) != (INS_DCBZ & 0xfffffff7)) {
kvmppc_core_queue_program(vcpu, flags);
return RESUME_GUEST;
}
}
vcpu->stat.emulated_inst_exits++;
er = kvmppc_emulate_instruction(run, vcpu);
switch (er) {
case EMULATE_DONE:
r = RESUME_GUEST_NV;
break;
case EMULATE_AGAIN:
r = RESUME_GUEST;
break;
case EMULATE_FAIL:
pr_crit("%s: emulation at %lx failed (%08x)\n",
__func__, kvmppc_get_pc(vcpu), last_inst);
kvmppc_core_queue_program(vcpu, flags);
r = RESUME_GUEST;
break;
case EMULATE_DO_MMIO:
run->exit_reason = KVM_EXIT_MMIO;
r = RESUME_HOST_NV;
break;
case EMULATE_EXIT_USER:
r = RESUME_HOST_NV;
break;
default:
BUG();
}
return r;
}
int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int exit_nr)
{
@ -1044,71 +1107,8 @@ int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
break;
case BOOK3S_INTERRUPT_PROGRAM:
case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
{
enum emulation_result er;
ulong flags;
u32 last_inst;
int emul;
program_interrupt:
/*
* shadow_srr1 only contains valid flags if we came here via
* a program exception. The other exceptions (emulation assist,
* FP unavailable, etc.) do not provide flags in SRR1, so use
* an illegal-instruction exception when injecting a program
* interrupt into the guest.
*/
if (exit_nr == BOOK3S_INTERRUPT_PROGRAM)
flags = vcpu->arch.shadow_srr1 & 0x1f0000ull;
else
flags = SRR1_PROGILL;
emul = kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
if (emul != EMULATE_DONE) {
r = RESUME_GUEST;
break;
}
if (kvmppc_get_msr(vcpu) & MSR_PR) {
#ifdef EXIT_DEBUG
pr_info("Userspace triggered 0x700 exception at\n 0x%lx (0x%x)\n",
kvmppc_get_pc(vcpu), last_inst);
#endif
if ((last_inst & 0xff0007ff) !=
(INS_DCBZ & 0xfffffff7)) {
kvmppc_core_queue_program(vcpu, flags);
r = RESUME_GUEST;
break;
}
}
vcpu->stat.emulated_inst_exits++;
er = kvmppc_emulate_instruction(run, vcpu);
switch (er) {
case EMULATE_DONE:
r = RESUME_GUEST_NV;
break;
case EMULATE_AGAIN:
r = RESUME_GUEST;
break;
case EMULATE_FAIL:
printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
__func__, kvmppc_get_pc(vcpu), last_inst);
kvmppc_core_queue_program(vcpu, flags);
r = RESUME_GUEST;
break;
case EMULATE_DO_MMIO:
run->exit_reason = KVM_EXIT_MMIO;
r = RESUME_HOST_NV;
break;
case EMULATE_EXIT_USER:
r = RESUME_HOST_NV;
break;
default:
BUG();
}
r = kvmppc_exit_pr_progint(run, vcpu, exit_nr);
break;
}
case BOOK3S_INTERRUPT_SYSCALL:
{
u32 last_sc;
@ -1185,7 +1185,7 @@ program_interrupt:
emul = kvmppc_get_last_inst(vcpu, INST_GENERIC,
&last_inst);
if (emul == EMULATE_DONE)
goto program_interrupt;
r = kvmppc_exit_pr_progint(run, vcpu, exit_nr);
else
r = RESUME_GUEST;

194
arch/powerpc/kvm/book3s_xics.c
View File

@ -63,7 +63,7 @@
/* -- ICS routines -- */
static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
u32 new_irq);
u32 new_irq, bool check_resend);
/*
* Return value ideally indicates how the interrupt was handled, but no
@ -75,6 +75,7 @@ static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level)
struct ics_irq_state *state;
struct kvmppc_ics *ics;
u16 src;
u32 pq_old, pq_new;
XICS_DBG("ics deliver %#x (level: %d)\n", irq, level);
@ -87,25 +88,41 @@ static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level)
if (!state->exists)
return -EINVAL;
if (level == KVM_INTERRUPT_SET_LEVEL || level == KVM_INTERRUPT_SET)
level = 1;
else if (level == KVM_INTERRUPT_UNSET)
level = 0;
/*
* We set state->asserted locklessly. This should be fine as
* we are the only setter, thus concurrent access is undefined
* to begin with.
* Take other values the same as 1, consistent with original code.
* maybe WARN here?
*/
if ((level == 1 && state->lsi) || level == KVM_INTERRUPT_SET_LEVEL)
state->asserted = 1;
else if (level == 0 || level == KVM_INTERRUPT_UNSET) {
state->asserted = 0;
if (!state->lsi && level == 0) /* noop for MSI */
return 0;
}
do {
pq_old = state->pq_state;
if (state->lsi) {
if (level) {
if (pq_old & PQ_PRESENTED)
/* Setting already set LSI ... */
return 0;
pq_new = PQ_PRESENTED;
} else
pq_new = 0;
} else
pq_new = ((pq_old << 1) & 3) | PQ_PRESENTED;
} while (cmpxchg(&state->pq_state, pq_old, pq_new) != pq_old);
/* Test P=1, Q=0, this is the only case where we present */
if (pq_new == PQ_PRESENTED)
icp_deliver_irq(xics, NULL, irq, false);
/* Record which CPU this arrived on for passed-through interrupts */
if (state->host_irq)
state->intr_cpu = raw_smp_processor_id();
/* Attempt delivery */
icp_deliver_irq(xics, NULL, irq);
return 0;
}
@ -114,29 +131,14 @@ static void ics_check_resend(struct kvmppc_xics *xics, struct kvmppc_ics *ics,
{
int i;
unsigned long flags;
local_irq_save(flags);
arch_spin_lock(&ics->lock);
for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
struct ics_irq_state *state = &ics->irq_state[i];
if (!state->resend)
continue;
XICS_DBG("resend %#x prio %#x\n", state->number,
state->priority);
arch_spin_unlock(&ics->lock);
local_irq_restore(flags);
icp_deliver_irq(xics, icp, state->number);
local_irq_save(flags);
arch_spin_lock(&ics->lock);
if (state->resend) {
XICS_DBG("resend %#x prio %#x\n", state->number,
state->priority);
icp_deliver_irq(xics, icp, state->number, true);
}
}
arch_spin_unlock(&ics->lock);
local_irq_restore(flags);
}
static bool write_xive(struct kvmppc_xics *xics, struct kvmppc_ics *ics,
@ -155,6 +157,7 @@ static bool write_xive(struct kvmppc_xics *xics, struct kvmppc_ics *ics,
deliver = false;
if ((state->masked_pending || state->resend) && priority != MASKED) {
state->masked_pending = 0;
state->resend = 0;
deliver = true;
}
@ -189,7 +192,7 @@ int kvmppc_xics_set_xive(struct kvm *kvm, u32 irq, u32 server, u32 priority)
state->masked_pending, state->resend);
if (write_xive(xics, ics, state, server, priority, priority))
icp_deliver_irq(xics, icp, irq);
icp_deliver_irq(xics, icp, irq, false);
return 0;
}
@ -242,7 +245,7 @@ int kvmppc_xics_int_on(struct kvm *kvm, u32 irq)
if (write_xive(xics, ics, state, state->server, state->saved_priority,
state->saved_priority))
icp_deliver_irq(xics, icp, irq);
icp_deliver_irq(xics, icp, irq, false);
return 0;
}
@ -376,7 +379,7 @@ static bool icp_try_to_deliver(struct kvmppc_icp *icp, u32 irq, u8 priority,
}
static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
u32 new_irq)
u32 new_irq, bool check_resend)
{
struct ics_irq_state *state;
struct kvmppc_ics *ics;
@ -422,6 +425,10 @@ static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
}
}
if (check_resend)
if (!state->resend)
goto out;
/* Clear the resend bit of that interrupt */
state->resend = 0;
@ -470,6 +477,7 @@ static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
arch_spin_unlock(&ics->lock);
local_irq_restore(flags);
new_irq = reject;
check_resend = 0;
goto again;
}
} else {
@ -477,9 +485,15 @@ static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
* We failed to deliver the interrupt we need to set the
* resend map bit and mark the ICS state as needing a resend
*/
set_bit(ics->icsid, icp->resend_map);
state->resend = 1;
/*
* Make sure when checking resend, we don't miss the resend
* if resend_map bit is seen and cleared.
*/
smp_wmb();
set_bit(ics->icsid, icp->resend_map);
/*
* If the need_resend flag got cleared in the ICP some time
* between icp_try_to_deliver() atomic update and now, then
@ -488,8 +502,10 @@ static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
*/
smp_mb();
if (!icp->state.need_resend) {
state->resend = 0;
arch_spin_unlock(&ics->lock);
local_irq_restore(flags);
check_resend = 0;
goto again;
}
}
@ -681,7 +697,7 @@ static noinline int kvmppc_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,
/* Handle reject */
if (reject && reject != XICS_IPI)
icp_deliver_irq(xics, icp, reject);
icp_deliver_irq(xics, icp, reject, false);
/* Handle resend */
if (resend)
@ -761,17 +777,54 @@ static noinline void kvmppc_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr)
* attempt (see comments in icp_deliver_irq).
*/
if (reject && reject != XICS_IPI)
icp_deliver_irq(xics, icp, reject);
icp_deliver_irq(xics, icp, reject, false);
}
static int ics_eoi(struct kvm_vcpu *vcpu, u32 irq)
{
struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
struct kvmppc_icp *icp = vcpu->arch.icp;
struct kvmppc_ics *ics;
struct ics_irq_state *state;
u16 src;
u32 pq_old, pq_new;
/*
* ICS EOI handling: For LSI, if P bit is still set, we need to
* resend it.
*
* For MSI, we move Q bit into P (and clear Q). If it is set,
* resend it.
*/
ics = kvmppc_xics_find_ics(xics, irq, &src);
if (!ics) {
XICS_DBG("ios_eoi: IRQ 0x%06x not found !\n", irq);
return H_PARAMETER;
}
state = &ics->irq_state[src];
if (state->lsi)
pq_new = state->pq_state;
else
do {
pq_old = state->pq_state;
pq_new = pq_old >> 1;
} while (cmpxchg(&state->pq_state, pq_old, pq_new) != pq_old);
if (pq_new & PQ_PRESENTED)
icp_deliver_irq(xics, icp, irq, false);
kvm_notify_acked_irq(vcpu->kvm, 0, irq);
return H_SUCCESS;
}
static noinline int kvmppc_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
{
struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
struct kvmppc_icp *icp = vcpu->arch.icp;
struct kvmppc_ics *ics;
struct ics_irq_state *state;
u32 irq = xirr & 0x00ffffff;
u16 src;
XICS_DBG("h_eoi vcpu %d eoi %#lx\n", vcpu->vcpu_id, xirr);
@ -794,26 +847,8 @@ static noinline int kvmppc_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
/* IPIs have no EOI */
if (irq == XICS_IPI)
return H_SUCCESS;
/*
* EOI handling: If the interrupt is still asserted, we need to
* resend it. We can take a lockless "peek" at the ICS state here.
*
* "Message" interrupts will never have "asserted" set
*/
ics = kvmppc_xics_find_ics(xics, irq, &src);
if (!ics) {
XICS_DBG("h_eoi: IRQ 0x%06x not found !\n", irq);
return H_PARAMETER;
}
state = &ics->irq_state[src];
/* Still asserted, resend it */
if (state->asserted)
icp_deliver_irq(xics, icp, irq);
kvm_notify_acked_irq(vcpu->kvm, 0, irq);
return H_SUCCESS;
return ics_eoi(vcpu, irq);
}
int kvmppc_xics_rm_complete(struct kvm_vcpu *vcpu, u32 hcall)
@ -832,10 +867,6 @@ int kvmppc_xics_rm_complete(struct kvm_vcpu *vcpu, u32 hcall)
icp->n_rm_check_resend++;
icp_check_resend(xics, icp->rm_resend_icp);
}
if (icp->rm_action & XICS_RM_REJECT) {
icp->n_rm_reject++;
icp_deliver_irq(xics, icp, icp->rm_reject);
}
if (icp->rm_action & XICS_RM_NOTIFY_EOI) {
icp->n_rm_notify_eoi++;
kvm_notify_acked_irq(vcpu->kvm, 0, icp->rm_eoied_irq);
@ -920,7 +951,7 @@ static int xics_debug_show(struct seq_file *m, void *private)
int icsid, i;
unsigned long flags;
unsigned long t_rm_kick_vcpu, t_rm_check_resend;
unsigned long t_rm_reject, t_rm_notify_eoi;
unsigned long t_rm_notify_eoi;
unsigned long t_reject, t_check_resend;
if (!kvm)
@ -929,7 +960,6 @@ static int xics_debug_show(struct seq_file *m, void *private)
t_rm_kick_vcpu = 0;
t_rm_notify_eoi = 0;
t_rm_check_resend = 0;
t_rm_reject = 0;
t_check_resend = 0;
t_reject = 0;
@ -952,14 +982,13 @@ static int xics_debug_show(struct seq_file *m, void *private)
t_rm_kick_vcpu += icp->n_rm_kick_vcpu;
t_rm_notify_eoi += icp->n_rm_notify_eoi;
t_rm_check_resend += icp->n_rm_check_resend;
t_rm_reject += icp->n_rm_reject;
t_check_resend += icp->n_check_resend;
t_reject += icp->n_reject;
}
seq_printf(m, "ICP Guest->Host totals: kick_vcpu=%lu check_resend=%lu reject=%lu notify_eoi=%lu\n",
seq_printf(m, "ICP Guest->Host totals: kick_vcpu=%lu check_resend=%lu notify_eoi=%lu\n",
t_rm_kick_vcpu, t_rm_check_resend,
t_rm_reject, t_rm_notify_eoi);
t_rm_notify_eoi);
seq_printf(m, "ICP Real Mode totals: check_resend=%lu resend=%lu\n",
t_check_resend, t_reject);
for (icsid = 0; icsid <= KVMPPC_XICS_MAX_ICS_ID; icsid++) {
@ -977,9 +1006,9 @@ static int xics_debug_show(struct seq_file *m, void *private)
for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
struct ics_irq_state *irq = &ics->irq_state[i];
seq_printf(m, "irq 0x%06x: server %#x prio %#x save prio %#x asserted %d resend %d masked pending %d\n",
seq_printf(m, "irq 0x%06x: server %#x prio %#x save prio %#x pq_state %d resend %d masked pending %d\n",
irq->number, irq->server, irq->priority,
irq->saved_priority, irq->asserted,
irq->saved_priority, irq->pq_state,
irq->resend, irq->masked_pending);
}
@ -1198,10 +1227,17 @@ static int xics_get_source(struct kvmppc_xics *xics, long irq, u64 addr)
val |= prio << KVM_XICS_PRIORITY_SHIFT;
if (irqp->lsi) {
val |= KVM_XICS_LEVEL_SENSITIVE;
if (irqp->asserted)
if (irqp->pq_state & PQ_PRESENTED)
val |= KVM_XICS_PENDING;
} else if (irqp->masked_pending || irqp->resend)
val |= KVM_XICS_PENDING;
if (irqp->pq_state & PQ_PRESENTED)
val |= KVM_XICS_PRESENTED;
if (irqp->pq_state & PQ_QUEUED)
val |= KVM_XICS_QUEUED;
ret = 0;
}
arch_spin_unlock(&ics->lock);
@ -1253,18 +1289,20 @@ static int xics_set_source(struct kvmppc_xics *xics, long irq, u64 addr)
irqp->resend = 0;
irqp->masked_pending = 0;
irqp->lsi = 0;
irqp->asserted = 0;
if (val & KVM_XICS_LEVEL_SENSITIVE) {
irqp->pq_state = 0;
if (val & KVM_XICS_LEVEL_SENSITIVE)
irqp->lsi = 1;
if (val & KVM_XICS_PENDING)
irqp->asserted = 1;
}
/* If PENDING, set P in case P is not saved because of old code */
if (val & KVM_XICS_PRESENTED || val & KVM_XICS_PENDING)
irqp->pq_state |= PQ_PRESENTED;
if (val & KVM_XICS_QUEUED)
irqp->pq_state |= PQ_QUEUED;
irqp->exists = 1;
arch_spin_unlock(&ics->lock);
local_irq_restore(flags);
if (val & KVM_XICS_PENDING)
icp_deliver_irq(xics, NULL, irqp->number);
icp_deliver_irq(xics, NULL, irqp->number, false);
return 0;
}

7
arch/powerpc/kvm/book3s_xics.h
View File

@ -31,16 +31,19 @@
/* Priority value to use for disabling an interrupt */
#define MASKED 0xff
#define PQ_PRESENTED 1
#define PQ_QUEUED 2
/* State for one irq source */
struct ics_irq_state {
u32 number;
u32 server;
u32 pq_state;
u8 priority;
u8 saved_priority;
u8 resend;
u8 masked_pending;
u8 lsi; /* level-sensitive interrupt */
u8 asserted; /* Only for LSI */
u8 exists;
int intr_cpu;
u32 host_irq;
@ -73,7 +76,6 @@ struct kvmppc_icp {
*/
#define XICS_RM_KICK_VCPU 0x1
#define XICS_RM_CHECK_RESEND 0x2
#define XICS_RM_REJECT 0x4
#define XICS_RM_NOTIFY_EOI 0x8
u32 rm_action;
struct kvm_vcpu *rm_kick_target;
@ -84,7 +86,6 @@ struct kvmppc_icp {
/* Counters for each reason we exited real mode */
unsigned long n_rm_kick_vcpu;
unsigned long n_rm_check_resend;
unsigned long n_rm_reject;
unsigned long n_rm_notify_eoi;
/* Counters for handling ICP processing in real mode */
unsigned long n_check_resend;

10
arch/powerpc/kvm/powerpc.c
View File

@ -511,6 +511,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_ONE_REG:
case KVM_CAP_IOEVENTFD:
case KVM_CAP_DEVICE_CTRL:
case KVM_CAP_IMMEDIATE_EXIT:
r = 1;
break;
case KVM_CAP_PPC_PAIRED_SINGLES:
@ -612,6 +613,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_SPAPR_MULTITCE:
r = 1;
break;
case KVM_CAP_SPAPR_RESIZE_HPT:
/* Disable this on POWER9 until code handles new HPTE format */
r = !!hv_enabled && !cpu_has_feature(CPU_FTR_ARCH_300);
break;
#endif
case KVM_CAP_PPC_HTM:
r = cpu_has_feature(CPU_FTR_TM_COMP) &&
@ -1114,7 +1119,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
#endif
}
r = kvmppc_vcpu_run(run, vcpu);
if (run->immediate_exit)
r = -EINTR;
else
r = kvmppc_vcpu_run(run, vcpu);
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);

26
arch/s390/kvm/gaccess.c
View File

@ -373,7 +373,7 @@ void ipte_unlock(struct kvm_vcpu *vcpu)
ipte_unlock_simple(vcpu);
}
static int ar_translation(struct kvm_vcpu *vcpu, union asce *asce, ar_t ar,
static int ar_translation(struct kvm_vcpu *vcpu, union asce *asce, u8 ar,
enum gacc_mode mode)
{
union alet alet;
@ -465,7 +465,9 @@ static int ar_translation(struct kvm_vcpu *vcpu, union asce *asce, ar_t ar,
struct trans_exc_code_bits {
unsigned long addr : 52; /* Translation-exception Address */
unsigned long fsi : 2; /* Access Exception Fetch/Store Indication */
unsigned long : 6;
unsigned long : 2;
unsigned long b56 : 1;
unsigned long : 3;
unsigned long b60 : 1;
unsigned long b61 : 1;
unsigned long as : 2; /* ASCE Identifier */
@ -485,7 +487,7 @@ enum prot_type {
};
static int trans_exc(struct kvm_vcpu *vcpu, int code, unsigned long gva,
ar_t ar, enum gacc_mode mode, enum prot_type prot)
u8 ar, enum gacc_mode mode, enum prot_type prot)
{
struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm;
struct trans_exc_code_bits *tec;
@ -497,14 +499,18 @@ static int trans_exc(struct kvm_vcpu *vcpu, int code, unsigned long gva,
switch (code) {
case PGM_PROTECTION:
switch (prot) {
case PROT_TYPE_LA:
tec->b56 = 1;
break;
case PROT_TYPE_KEYC:
tec->b60 = 1;
break;
case PROT_TYPE_ALC:
tec->b60 = 1;
/* FALL THROUGH */
case PROT_TYPE_DAT:
tec->b61 = 1;
break;
default: /* LA and KEYC set b61 to 0, other params undefined */
return code;
}
/* FALL THROUGH */
case PGM_ASCE_TYPE:
@ -539,7 +545,7 @@ static int trans_exc(struct kvm_vcpu *vcpu, int code, unsigned long gva,
}
static int get_vcpu_asce(struct kvm_vcpu *vcpu, union asce *asce,
unsigned long ga, ar_t ar, enum gacc_mode mode)
unsigned long ga, u8 ar, enum gacc_mode mode)
{
int rc;
struct psw_bits psw = psw_bits(vcpu->arch.sie_block->gpsw);
@ -771,7 +777,7 @@ static int low_address_protection_enabled(struct kvm_vcpu *vcpu,
return 1;
}
static int guest_page_range(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar,
static int guest_page_range(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar,
unsigned long *pages, unsigned long nr_pages,
const union asce asce, enum gacc_mode mode)
{
@ -803,7 +809,7 @@ static int guest_page_range(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar,
return 0;
}
int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data,
unsigned long len, enum gacc_mode mode)
{
psw_t *psw = &vcpu->arch.sie_block->gpsw;
@ -877,7 +883,7 @@ int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
* Note: The IPTE lock is not taken during this function, so the caller
* has to take care of this.
*/
int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar,
unsigned long *gpa, enum gacc_mode mode)
{
psw_t *psw = &vcpu->arch.sie_block->gpsw;
@ -910,7 +916,7 @@ int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
/**
* check_gva_range - test a range of guest virtual addresses for accessibility
*/
int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar,
unsigned long length, enum gacc_mode mode)
{
unsigned long gpa;

19
arch/s390/kvm/gaccess.h
View File

@ -162,11 +162,11 @@ enum gacc_mode {
};
int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva,
ar_t ar, unsigned long *gpa, enum gacc_mode mode);
int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
u8 ar, unsigned long *gpa, enum gacc_mode mode);
int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar,
unsigned long length, enum gacc_mode mode);
int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data,
unsigned long len, enum gacc_mode mode);
int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
@ -218,7 +218,7 @@ int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
* if data has been changed in guest space in case of an exception.
*/
static inline __must_check
int write_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
int write_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data,
unsigned long len)
{
return access_guest(vcpu, ga, ar, data, len, GACC_STORE);
@ -238,7 +238,7 @@ int write_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
* data will be copied from guest space to kernel space.
*/
static inline __must_check
int read_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
int read_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data,
unsigned long len)
{
return access_guest(vcpu, ga, ar, data, len, GACC_FETCH);
@ -247,10 +247,11 @@ int read_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
/**
* read_guest_instr - copy instruction data from guest space to kernel space
* @vcpu: virtual cpu
* @ga: guest address
* @data: destination address in kernel space
* @len: number of bytes to copy
*
* Copy @len bytes from the current psw address (guest space) to @data (kernel
* Copy @len bytes from the given address (guest space) to @data (kernel
* space).
*
* The behaviour of read_guest_instr is identical to read_guest, except that
@ -258,10 +259,10 @@ int read_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
* address-space mode.
*/
static inline __must_check
int read_guest_instr(struct kvm_vcpu *vcpu, void *data, unsigned long len)
int read_guest_instr(struct kvm_vcpu *vcpu, unsigned long ga, void *data,
unsigned long len)
{
return access_guest(vcpu, vcpu->arch.sie_block->gpsw.addr, 0, data, len,
GACC_IFETCH);
return access_guest(vcpu, ga, 0, data, len, GACC_IFETCH);
}
/**

120
arch/s390/kvm/guestdbg.c
View File

@ -388,14 +388,13 @@ void kvm_s390_prepare_debug_exit(struct kvm_vcpu *vcpu)
#define per_write_wp_event(code) \
(code & (PER_CODE_STORE | PER_CODE_STORE_REAL))
static int debug_exit_required(struct kvm_vcpu *vcpu)
static int debug_exit_required(struct kvm_vcpu *vcpu, u8 perc,
unsigned long peraddr)
{
u8 perc = vcpu->arch.sie_block->perc;
struct kvm_debug_exit_arch *debug_exit = &vcpu->run->debug.arch;
struct kvm_hw_wp_info_arch *wp_info = NULL;
struct kvm_hw_bp_info_arch *bp_info = NULL;
unsigned long addr = vcpu->arch.sie_block->gpsw.addr;
unsigned long peraddr = vcpu->arch.sie_block->peraddr;
if (guestdbg_hw_bp_enabled(vcpu)) {
if (per_write_wp_event(perc) &&
@ -437,36 +436,118 @@ exit_required:
return 1;
}
static int per_fetched_addr(struct kvm_vcpu *vcpu, unsigned long *addr)
{
u8 exec_ilen = 0;
u16 opcode[3];
int rc;
if (vcpu->arch.sie_block->icptcode == ICPT_PROGI) {
/* PER address references the fetched or the execute instr */
*addr = vcpu->arch.sie_block->peraddr;
/*
* Manually detect if we have an EXECUTE instruction. As
* instructions are always 2 byte aligned we can read the
* first two bytes unconditionally
*/
rc = read_guest_instr(vcpu, *addr, &opcode, 2);
if (rc)
return rc;
if (opcode[0] >> 8 == 0x44)
exec_ilen = 4;
if ((opcode[0] & 0xff0f) == 0xc600)
exec_ilen = 6;
} else {
/* instr was suppressed, calculate the responsible instr */
*addr = __rewind_psw(vcpu->arch.sie_block->gpsw,
kvm_s390_get_ilen(vcpu));
if (vcpu->arch.sie_block->icptstatus & 0x01) {
exec_ilen = (vcpu->arch.sie_block->icptstatus & 0x60) >> 4;
if (!exec_ilen)
exec_ilen = 4;
}
}
if (exec_ilen) {
/* read the complete EXECUTE instr to detect the fetched addr */
rc = read_guest_instr(vcpu, *addr, &opcode, exec_ilen);
if (rc)
return rc;
if (exec_ilen == 6) {
/* EXECUTE RELATIVE LONG - RIL-b format */
s32 rl = *((s32 *) (opcode + 1));
/* rl is a _signed_ 32 bit value specifying halfwords */
*addr += (u64)(s64) rl * 2;
} else {
/* EXECUTE - RX-a format */
u32 base = (opcode[1] & 0xf000) >> 12;
u32 disp = opcode[1] & 0x0fff;
u32 index = opcode[0] & 0x000f;
*addr = base ? vcpu->run->s.regs.gprs[base] : 0;
*addr += index ? vcpu->run->s.regs.gprs[index] : 0;
*addr += disp;
}
*addr = kvm_s390_logical_to_effective(vcpu, *addr);
}
return 0;
}
#define guest_per_enabled(vcpu) \
(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER)
int kvm_s390_handle_per_ifetch_icpt(struct kvm_vcpu *vcpu)
{
const u64 cr10 = vcpu->arch.sie_block->gcr[10];
const u64 cr11 = vcpu->arch.sie_block->gcr[11];
const u8 ilen = kvm_s390_get_ilen(vcpu);
struct kvm_s390_pgm_info pgm_info = {
.code = PGM_PER,
.per_code = PER_CODE_IFETCH,
.per_address = __rewind_psw(vcpu->arch.sie_block->gpsw, ilen),
};
unsigned long fetched_addr;
int rc;
/*
* The PSW points to the next instruction, therefore the intercepted
* instruction generated a PER i-fetch event. PER address therefore
* points at the previous PSW address (could be an EXECUTE function).
*/
return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
if (!guestdbg_enabled(vcpu))
return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
if (debug_exit_required(vcpu, pgm_info.per_code, pgm_info.per_address))
vcpu->guest_debug |= KVM_GUESTDBG_EXIT_PENDING;
if (!guest_per_enabled(vcpu) ||
!(vcpu->arch.sie_block->gcr[9] & PER_EVENT_IFETCH))
return 0;
rc = per_fetched_addr(vcpu, &fetched_addr);
if (rc < 0)
return rc;
if (rc)
/* instruction-fetching exceptions */
return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
if (in_addr_range(fetched_addr, cr10, cr11))
return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
return 0;
}
static void filter_guest_per_event(struct kvm_vcpu *vcpu)
static int filter_guest_per_event(struct kvm_vcpu *vcpu)
{
const u8 perc = vcpu->arch.sie_block->perc;
u64 peraddr = vcpu->arch.sie_block->peraddr;
u64 addr = vcpu->arch.sie_block->gpsw.addr;
u64 cr9 = vcpu->arch.sie_block->gcr[9];
u64 cr10 = vcpu->arch.sie_block->gcr[10];
u64 cr11 = vcpu->arch.sie_block->gcr[11];
/* filter all events, demanded by the guest */
u8 guest_perc = perc & (cr9 >> 24) & PER_CODE_MASK;
unsigned long fetched_addr;
int rc;
if (!guest_per_enabled(vcpu))
guest_perc = 0;
@ -478,9 +559,17 @@ static void filter_guest_per_event(struct kvm_vcpu *vcpu)
guest_perc &= ~PER_CODE_BRANCH;
/* filter "instruction-fetching" events */
if (guest_perc & PER_CODE_IFETCH &&
!in_addr_range(peraddr, cr10, cr11))
guest_perc &= ~PER_CODE_IFETCH;
if (guest_perc & PER_CODE_IFETCH) {
rc = per_fetched_addr(vcpu, &fetched_addr);
if (rc < 0)
return rc;
/*
* Don't inject an irq on exceptions. This would make handling
* on icpt code 8 very complex (as PSW was already rewound).
*/
if (rc || !in_addr_range(fetched_addr, cr10, cr11))
guest_perc &= ~PER_CODE_IFETCH;
}
/* All other PER events will be given to the guest */
/* TODO: Check altered address/address space */
@ -489,6 +578,7 @@ static void filter_guest_per_event(struct kvm_vcpu *vcpu)
if (!guest_perc)
vcpu->arch.sie_block->iprcc &= ~PGM_PER;
return 0;
}
#define pssec(vcpu) (vcpu->arch.sie_block->gcr[1] & _ASCE_SPACE_SWITCH)
@ -496,14 +586,17 @@ static void filter_guest_per_event(struct kvm_vcpu *vcpu)
#define old_ssec(vcpu) ((vcpu->arch.sie_block->tecmc >> 31) & 0x1)
#define old_as_is_home(vcpu) !(vcpu->arch.sie_block->tecmc & 0xffff)
void kvm_s390_handle_per_event(struct kvm_vcpu *vcpu)
int kvm_s390_handle_per_event(struct kvm_vcpu *vcpu)
{
int new_as;
int rc, new_as;
if (debug_exit_required(vcpu))
if (debug_exit_required(vcpu, vcpu->arch.sie_block->perc,
vcpu->arch.sie_block->peraddr))
vcpu->guest_debug |= KVM_GUESTDBG_EXIT_PENDING;
filter_guest_per_event(vcpu);
rc = filter_guest_per_event(vcpu);
if (rc)
return rc;
/*
* Only RP, SAC, SACF, PT, PTI, PR, PC instructions can trigger
@ -532,4 +625,5 @@ void kvm_s390_handle_per_event(struct kvm_vcpu *vcpu)
(pssec(vcpu) || old_ssec(vcpu)))
vcpu->arch.sie_block->iprcc = PGM_SPACE_SWITCH;
}
return 0;
}

25
arch/s390/kvm/intercept.c
View File

@ -238,7 +238,9 @@ static int handle_prog(struct kvm_vcpu *vcpu)
vcpu->stat.exit_program_interruption++;
if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
kvm_s390_handle_per_event(vcpu);
rc = kvm_s390_handle_per_event(vcpu);
if (rc)
return rc;
/* the interrupt might have been filtered out completely */
if (vcpu->arch.sie_block->iprcc == 0)
return 0;
@ -359,6 +361,9 @@ static int handle_partial_execution(struct kvm_vcpu *vcpu)
static int handle_operexc(struct kvm_vcpu *vcpu)
{
psw_t oldpsw, newpsw;
int rc;
vcpu->stat.exit_operation_exception++;
trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa,
vcpu->arch.sie_block->ipb);
@ -369,6 +374,24 @@ static int handle_operexc(struct kvm_vcpu *vcpu)
if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0)
return -EOPNOTSUPP;
rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &newpsw, sizeof(psw_t));
if (rc)
return rc;
/*
* Avoid endless loops of operation exceptions, if the pgm new
* PSW will cause a new operation exception.
* The heuristic checks if the pgm new psw is within 6 bytes before
* the faulting psw address (with same DAT, AS settings) and the
* new psw is not a wait psw and the fault was not triggered by
* problem state.
*/
oldpsw = vcpu->arch.sie_block->gpsw;
if (oldpsw.addr - newpsw.addr <= 6 &&
!(newpsw.mask & PSW_MASK_WAIT) &&
!(oldpsw.mask & PSW_MASK_PSTATE) &&
(newpsw.mask & PSW_MASK_ASC) == (oldpsw.mask & PSW_MASK_ASC) &&
(newpsw.mask & PSW_MASK_DAT) == (oldpsw.mask & PSW_MASK_DAT))
return -EOPNOTSUPP;
return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
}

46
arch/s390/kvm/kvm-s390.c
View File

@ -218,7 +218,7 @@ static void allow_cpu_feat(unsigned long nr)
static inline int plo_test_bit(unsigned char nr)
{
register unsigned long r0 asm("0") = (unsigned long) nr | 0x100;
int cc = 3; /* subfunction not available */
int cc;
asm volatile(
/* Parameter registers are ignored for "test bit" */
@ -371,6 +371,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_S390_IRQCHIP:
case KVM_CAP_VM_ATTRIBUTES:
case KVM_CAP_MP_STATE:
case KVM_CAP_IMMEDIATE_EXIT:
case KVM_CAP_S390_INJECT_IRQ:
case KVM_CAP_S390_USER_SIGP:
case KVM_CAP_S390_USER_STSI:
@ -443,6 +444,9 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
struct kvm_memory_slot *memslot;
int is_dirty = 0;
if (kvm_is_ucontrol(kvm))
return -EINVAL;
mutex_lock(&kvm->slots_lock);
r = -EINVAL;
@ -506,6 +510,14 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
} else if (MACHINE_HAS_VX) {
set_kvm_facility(kvm->arch.model.fac_mask, 129);
set_kvm_facility(kvm->arch.model.fac_list, 129);
if (test_facility(134)) {
set_kvm_facility(kvm->arch.model.fac_mask, 134);
set_kvm_facility(kvm->arch.model.fac_list, 134);
}
if (test_facility(135)) {
set_kvm_facility(kvm->arch.model.fac_mask, 135);
set_kvm_facility(kvm->arch.model.fac_list, 135);
}
r = 0;
} else
r = -EINVAL;
@ -822,6 +834,13 @@ static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
}
memcpy(kvm->arch.model.fac_list, proc->fac_list,
S390_ARCH_FAC_LIST_SIZE_BYTE);
VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
kvm->arch.model.ibc,
kvm->arch.model.cpuid);
VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
kvm->arch.model.fac_list[0],
kvm->arch.model.fac_list[1],
kvm->arch.model.fac_list[2]);
} else
ret = -EFAULT;
kfree(proc);
@ -895,6 +914,13 @@ static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
proc->ibc = kvm->arch.model.ibc;
memcpy(&proc->fac_list, kvm->arch.model.fac_list,
S390_ARCH_FAC_LIST_SIZE_BYTE);
VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
kvm->arch.model.ibc,
kvm->arch.model.cpuid);
VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
kvm->arch.model.fac_list[0],
kvm->arch.model.fac_list[1],
kvm->arch.model.fac_list[2]);
if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
ret = -EFAULT;
kfree(proc);
@ -918,6 +944,17 @@ static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
S390_ARCH_FAC_LIST_SIZE_BYTE);
memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list,
sizeof(S390_lowcore.stfle_fac_list));
VM_EVENT(kvm, 3, "GET: host ibc: 0x%4.4x, host cpuid: 0x%16.16llx",
kvm->arch.model.ibc,
kvm->arch.model.cpuid);
VM_EVENT(kvm, 3, "GET: host facmask: 0x%16.16llx.%16.16llx.%16.16llx",
mach->fac_mask[0],
mach->fac_mask[1],
mach->fac_mask[2]);
VM_EVENT(kvm, 3, "GET: host faclist: 0x%16.16llx.%16.16llx.%16.16llx",
mach->fac_list[0],
mach->fac_list[1],
mach->fac_list[2]);
if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
ret = -EFAULT;
kfree(mach);
@ -1939,6 +1976,8 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
if (test_kvm_facility(vcpu->kvm, 8) && sclp.has_pfmfi)
vcpu->arch.sie_block->ecb2 |= 0x08;
if (test_kvm_facility(vcpu->kvm, 130))
vcpu->arch.sie_block->ecb2 |= 0x20;
vcpu->arch.sie_block->eca = 0x1002000U;
if (sclp.has_cei)
vcpu->arch.sie_block->eca |= 0x80000000U;
@ -2579,7 +2618,7 @@ static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
* to look up the current opcode to get the length of the instruction
* to be able to forward the PSW.
*/
rc = read_guest_instr(vcpu, &opcode, 1);
rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
ilen = insn_length(opcode);
if (rc < 0) {
return rc;
@ -2761,6 +2800,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
int rc;
sigset_t sigsaved;
if (kvm_run->immediate_exit)
return -EINTR;
if (guestdbg_exit_pending(vcpu)) {
kvm_s390_prepare_debug_exit(vcpu);
return 0;

12
arch/s390/kvm/kvm-s390.h
View File

@ -86,9 +86,7 @@ static inline void kvm_s390_set_prefix(struct kvm_vcpu *vcpu, u32 prefix)
kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
}
typedef u8 __bitwise ar_t;
static inline u64 kvm_s390_get_base_disp_s(struct kvm_vcpu *vcpu, ar_t *ar)
static inline u64 kvm_s390_get_base_disp_s(struct kvm_vcpu *vcpu, u8 *ar)
{
u32 base2 = vcpu->arch.sie_block->ipb >> 28;
u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
@ -101,7 +99,7 @@ static inline u64 kvm_s390_get_base_disp_s(struct kvm_vcpu *vcpu, ar_t *ar)
static inline void kvm_s390_get_base_disp_sse(struct kvm_vcpu *vcpu,
u64 *address1, u64 *address2,
ar_t *ar_b1, ar_t *ar_b2)
u8 *ar_b1, u8 *ar_b2)
{
u32 base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
u32 disp1 = (vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16;
@ -125,7 +123,7 @@ static inline void kvm_s390_get_regs_rre(struct kvm_vcpu *vcpu, int *r1, int *r2
*r2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
}
static inline u64 kvm_s390_get_base_disp_rsy(struct kvm_vcpu *vcpu, ar_t *ar)
static inline u64 kvm_s390_get_base_disp_rsy(struct kvm_vcpu *vcpu, u8 *ar)
{
u32 base2 = vcpu->arch.sie_block->ipb >> 28;
u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) +
@ -140,7 +138,7 @@ static inline u64 kvm_s390_get_base_disp_rsy(struct kvm_vcpu *vcpu, ar_t *ar)
return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + (long)(int)disp2;
}
static inline u64 kvm_s390_get_base_disp_rs(struct kvm_vcpu *vcpu, ar_t *ar)
static inline u64 kvm_s390_get_base_disp_rs(struct kvm_vcpu *vcpu, u8 *ar)
{
u32 base2 = vcpu->arch.sie_block->ipb >> 28;
u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
@ -379,7 +377,7 @@ int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
void kvm_s390_clear_bp_data(struct kvm_vcpu *vcpu);
void kvm_s390_prepare_debug_exit(struct kvm_vcpu *vcpu);
int kvm_s390_handle_per_ifetch_icpt(struct kvm_vcpu *vcpu);
void kvm_s390_handle_per_event(struct kvm_vcpu *vcpu);
int kvm_s390_handle_per_event(struct kvm_vcpu *vcpu);
/* support for Basic/Extended SCA handling */
static inline union ipte_control *kvm_s390_get_ipte_control(struct kvm *kvm)

30
arch/s390/kvm/priv.c
View File

@ -54,7 +54,7 @@ int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
static int handle_set_clock(struct kvm_vcpu *vcpu)
{
int rc;
ar_t ar;
u8 ar;
u64 op2, val;
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
@ -79,7 +79,7 @@ static int handle_set_prefix(struct kvm_vcpu *vcpu)
u64 operand2;
u32 address;
int rc;
ar_t ar;
u8 ar;
vcpu->stat.instruction_spx++;
@ -117,7 +117,7 @@ static int handle_store_prefix(struct kvm_vcpu *vcpu)
u64 operand2;
u32 address;
int rc;
ar_t ar;
u8 ar;
vcpu->stat.instruction_stpx++;
@ -147,7 +147,7 @@ static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
u16 vcpu_id = vcpu->vcpu_id;
u64 ga;
int rc;
ar_t ar;
u8 ar;
vcpu->stat.instruction_stap++;
@ -380,7 +380,7 @@ static int handle_tpi(struct kvm_vcpu *vcpu)
u32 tpi_data[3];
int rc;
u64 addr;
ar_t ar;
u8 ar;
addr = kvm_s390_get_base_disp_s(vcpu, &ar);
if (addr & 3)
@ -548,7 +548,7 @@ int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
psw_compat_t new_psw;
u64 addr;
int rc;
ar_t ar;
u8 ar;
if (gpsw->mask & PSW_MASK_PSTATE)
return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
@ -575,7 +575,7 @@ static int handle_lpswe(struct kvm_vcpu *vcpu)
psw_t new_psw;
u64 addr;
int rc;
ar_t ar;
u8 ar;
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
@ -597,7 +597,7 @@ static int handle_stidp(struct kvm_vcpu *vcpu)
u64 stidp_data = vcpu->kvm->arch.model.cpuid;
u64 operand2;
int rc;
ar_t ar;
u8 ar;
vcpu->stat.instruction_stidp++;
@ -644,7 +644,7 @@ static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
ASCEBC(mem->vm[0].cpi, 16);
}
static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, ar_t ar,
static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
u8 fc, u8 sel1, u16 sel2)
{
vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
@ -663,7 +663,7 @@ static int handle_stsi(struct kvm_vcpu *vcpu)
unsigned long mem = 0;
u64 operand2;
int rc = 0;
ar_t ar;
u8 ar;
vcpu->stat.instruction_stsi++;
VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
@ -970,7 +970,7 @@ int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
int reg, rc, nr_regs;
u32 ctl_array[16];
u64 ga;
ar_t ar;
u8 ar;
vcpu->stat.instruction_lctl++;
@ -1009,7 +1009,7 @@ int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
int reg, rc, nr_regs;
u32 ctl_array[16];
u64 ga;
ar_t ar;
u8 ar;
vcpu->stat.instruction_stctl++;
@ -1043,7 +1043,7 @@ static int handle_lctlg(struct kvm_vcpu *vcpu)
int reg, rc, nr_regs;
u64 ctl_array[16];
u64 ga;
ar_t ar;
u8 ar;
vcpu->stat.instruction_lctlg++;
@ -1081,7 +1081,7 @@ static int handle_stctg(struct kvm_vcpu *vcpu)
int reg, rc, nr_regs;
u64 ctl_array[16];
u64 ga;
ar_t ar;
u8 ar;
vcpu->stat.instruction_stctg++;
@ -1132,7 +1132,7 @@ static int handle_tprot(struct kvm_vcpu *vcpu)
unsigned long hva, gpa;
int ret = 0, cc = 0;
bool writable;
ar_t ar;
u8 ar;
vcpu->stat.instruction_tprot++;

3
arch/s390/kvm/vsie.c
View File

@ -324,6 +324,9 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
/* Run-time-Instrumentation */
if (test_kvm_facility(vcpu->kvm, 64))
scb_s->ecb3 |= scb_o->ecb3 & 0x01U;
/* Instruction Execution Prevention */
if (test_kvm_facility(vcpu->kvm, 130))
scb_s->ecb2 |= scb_o->ecb2 & 0x20U;
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIIF))
scb_s->eca |= scb_o->eca & 0x00000001U;
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IB))

2
arch/s390/mm/pgtable.c
View File

@ -744,7 +744,7 @@ int reset_guest_reference_bit(struct mm_struct *mm, unsigned long addr)
pgste_set_unlock(ptep, new);
pte_unmap_unlock(ptep, ptl);
return 0;
return cc;
}
EXPORT_SYMBOL(reset_guest_reference_bit);

2
arch/s390/tools/gen_facilities.c
View File

@ -80,6 +80,8 @@ static struct facility_def facility_defs[] = {
76, /* msa extension 3 */
77, /* msa extension 4 */
78, /* enhanced-DAT 2 */
130, /* instruction-execution-protection */
131, /* enhanced-SOP 2 and side-effect */
-1 /* END */
}
},

58
arch/x86/include/asm/desc.h
View File

@ -177,16 +177,8 @@ static inline void __set_tss_desc(unsigned cpu, unsigned int entry, void *addr)
struct desc_struct *d = get_cpu_gdt_table(cpu);
tss_desc tss;
/*
* sizeof(unsigned long) coming from an extra "long" at the end
* of the iobitmap. See tss_struct definition in processor.h
*
* -1? seg base+limit should be pointing to the address of the
* last valid byte
*/
set_tssldt_descriptor(&tss, (unsigned long)addr, DESC_TSS,
IO_BITMAP_OFFSET + IO_BITMAP_BYTES +
sizeof(unsigned long) - 1);
__KERNEL_TSS_LIMIT);
write_gdt_entry(d, entry, &tss, DESC_TSS);
}
@ -213,6 +205,54 @@ static inline void native_load_tr_desc(void)
asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8));
}
static inline void force_reload_TR(void)
{
struct desc_struct *d = get_cpu_gdt_table(smp_processor_id());
tss_desc tss;
memcpy(&tss, &d[GDT_ENTRY_TSS], sizeof(tss_desc));
/*
* LTR requires an available TSS, and the TSS is currently
* busy. Make it be available so that LTR will work.
*/
tss.type = DESC_TSS;
write_gdt_entry(d, GDT_ENTRY_TSS, &tss, DESC_TSS);
load_TR_desc();
}
DECLARE_PER_CPU(bool, need_tr_refresh);
static inline void refresh_TR(void)
{
DEBUG_LOCKS_WARN_ON(preemptible());
if (unlikely(this_cpu_read(need_tr_refresh))) {
force_reload_TR();
this_cpu_write(need_tr_refresh, false);
}
}
/*
* If you do something evil that corrupts the cached TSS limit (I'm looking
* at you, VMX exits), call this function.
*
* The optimization here is that the TSS limit only matters for Linux if the
* IO bitmap is in use. If the TSS limit gets forced to its minimum value,
* everything works except that IO bitmap will be ignored and all CPL 3 IO
* instructions will #GP, which is exactly what we want for normal tasks.
*/
static inline void invalidate_tss_limit(void)
{
DEBUG_LOCKS_WARN_ON(preemptible());
if (unlikely(test_thread_flag(TIF_IO_BITMAP)))
force_reload_TR();
else
this_cpu_write(need_tr_refresh, true);
}
static inline void native_load_gdt(const struct desc_ptr *dtr)
{
asm volatile("lgdt %0"::"m" (*dtr));

1
arch/x86/include/asm/kvm_emulate.h
View File

@ -441,5 +441,6 @@ int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq);
void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt);
void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt);
bool emulator_can_use_gpa(struct x86_emulate_ctxt *ctxt);
#endif /* _ASM_X86_KVM_X86_EMULATE_H */

30
arch/x86/include/asm/kvm_host.h
View File

@ -55,7 +55,6 @@
#define KVM_REQ_TRIPLE_FAULT 10
#define KVM_REQ_MMU_SYNC 11
#define KVM_REQ_CLOCK_UPDATE 12
#define KVM_REQ_DEACTIVATE_FPU 13
#define KVM_REQ_EVENT 14
#define KVM_REQ_APF_HALT 15
#define KVM_REQ_STEAL_UPDATE 16
@ -115,7 +114,7 @@ static inline gfn_t gfn_to_index(gfn_t gfn, gfn_t base_gfn, int level)
#define KVM_PERMILLE_MMU_PAGES 20
#define KVM_MIN_ALLOC_MMU_PAGES 64
#define KVM_MMU_HASH_SHIFT 10
#define KVM_MMU_HASH_SHIFT 12
#define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
#define KVM_MIN_FREE_MMU_PAGES 5
#define KVM_REFILL_PAGES 25
@ -208,6 +207,13 @@ enum {
PFERR_WRITE_MASK | \
PFERR_PRESENT_MASK)
/*
* The mask used to denote special SPTEs, which can be either MMIO SPTEs or
* Access Tracking SPTEs. We use bit 62 instead of bit 63 to avoid conflicting
* with the SVE bit in EPT PTEs.
*/
#define SPTE_SPECIAL_MASK (1ULL << 62)
/* apic attention bits */
#define KVM_APIC_CHECK_VAPIC 0
/*
@ -668,6 +674,9 @@ struct kvm_vcpu_arch {
int pending_ioapic_eoi;
int pending_external_vector;
/* GPA available (AMD only) */
bool gpa_available;
};
struct kvm_lpage_info {
@ -716,6 +725,12 @@ struct kvm_hv {
HV_REFERENCE_TSC_PAGE tsc_ref;
};
enum kvm_irqchip_mode {
KVM_IRQCHIP_NONE,
KVM_IRQCHIP_KERNEL, /* created with KVM_CREATE_IRQCHIP */
KVM_IRQCHIP_SPLIT, /* created with KVM_CAP_SPLIT_IRQCHIP */
};
struct kvm_arch {
unsigned int n_used_mmu_pages;
unsigned int n_requested_mmu_pages;
@ -788,7 +803,7 @@ struct kvm_arch {
u64 disabled_quirks;
bool irqchip_split;
enum kvm_irqchip_mode irqchip_mode;
u8 nr_reserved_ioapic_pins;
bool disabled_lapic_found;
@ -815,6 +830,7 @@ struct kvm_vm_stat {
ulong mmu_unsync;
ulong remote_tlb_flush;
ulong lpages;
ulong max_mmu_page_hash_collisions;
};
struct kvm_vcpu_stat {
@ -844,6 +860,7 @@ struct kvm_vcpu_stat {
u64 hypercalls;
u64 irq_injections;
u64 nmi_injections;
u64 req_event;
};
struct x86_instruction_info;
@ -918,8 +935,6 @@ struct kvm_x86_ops {
unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
u32 (*get_pkru)(struct kvm_vcpu *vcpu);
void (*fpu_activate)(struct kvm_vcpu *vcpu);
void (*fpu_deactivate)(struct kvm_vcpu *vcpu);
void (*tlb_flush)(struct kvm_vcpu *vcpu);
@ -951,7 +966,7 @@ struct kvm_x86_ops {
void (*set_virtual_x2apic_mode)(struct kvm_vcpu *vcpu, bool set);
void (*set_apic_access_page_addr)(struct kvm_vcpu *vcpu, hpa_t hpa);
void (*deliver_posted_interrupt)(struct kvm_vcpu *vcpu, int vector);
void (*sync_pir_to_irr)(struct kvm_vcpu *vcpu);
int (*sync_pir_to_irr)(struct kvm_vcpu *vcpu);
int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
int (*get_tdp_level)(void);
u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
@ -1050,7 +1065,8 @@ void kvm_mmu_setup(struct kvm_vcpu *vcpu);
void kvm_mmu_init_vm(struct kvm *kvm);
void kvm_mmu_uninit_vm(struct kvm *kvm);
void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
u64 dirty_mask, u64 nx_mask, u64 x_mask, u64 p_mask);
u64 dirty_mask, u64 nx_mask, u64 x_mask, u64 p_mask,
u64 acc_track_mask);
void kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
void kvm_mmu_slot_remove_write_access(struct kvm *kvm,

6
arch/x86/include/asm/kvmclock.h Normal file
View File

@ -0,0 +1,6 @@
#ifndef _ASM_X86_KVM_CLOCK_H
#define _ASM_X86_KVM_CLOCK_H
extern struct clocksource kvm_clock;
#endif /* _ASM_X86_KVM_CLOCK_H */

2
arch/x86/include/asm/paravirt.h
View File

@ -673,7 +673,7 @@ static __always_inline void pv_kick(int cpu)
PVOP_VCALL1(pv_lock_ops.kick, cpu);
}
static __always_inline bool pv_vcpu_is_preempted(int cpu)
static __always_inline bool pv_vcpu_is_preempted(long cpu)
{
return PVOP_CALLEE1(bool, pv_lock_ops.vcpu_is_preempted, cpu);
}

12
arch/x86/include/asm/processor.h
View File

@ -304,7 +304,7 @@ struct x86_hw_tss {
u16 reserved5;
u16 io_bitmap_base;
} __attribute__((packed)) ____cacheline_aligned;
} __attribute__((packed));
#endif
/*
@ -342,6 +342,16 @@ struct tss_struct {
DECLARE_PER_CPU_SHARED_ALIGNED(struct tss_struct, cpu_tss);
/*
* sizeof(unsigned long) coming from an extra "long" at the end
* of the iobitmap.
*
* -1? seg base+limit should be pointing to the address of the
* last valid byte
*/
#define __KERNEL_TSS_LIMIT \
(IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1)
#ifdef CONFIG_X86_32
DECLARE_PER_CPU(unsigned long, cpu_current_top_of_stack);
#endif

2
arch/x86/include/asm/qspinlock.h
View File

@ -34,7 +34,7 @@ static inline void queued_spin_unlock(struct qspinlock *lock)
}
#define vcpu_is_preempted vcpu_is_preempted
static inline bool vcpu_is_preempted(int cpu)
static inline bool vcpu_is_preempted(long cpu)
{
return pv_vcpu_is_preempted(cpu);
}

28
arch/x86/include/asm/vmx.h
View File

@ -467,8 +467,16 @@ enum vmcs_field {
#define VMX_EPT_WRITABLE_MASK 0x2ull
#define VMX_EPT_EXECUTABLE_MASK 0x4ull
#define VMX_EPT_IPAT_BIT (1ull << 6)
#define VMX_EPT_ACCESS_BIT (1ull << 8)
#define VMX_EPT_DIRTY_BIT (1ull << 9)
#define VMX_EPT_ACCESS_BIT (1ull << 8)
#define VMX_EPT_DIRTY_BIT (1ull << 9)
#define VMX_EPT_RWX_MASK (VMX_EPT_READABLE_MASK | \
VMX_EPT_WRITABLE_MASK | \
VMX_EPT_EXECUTABLE_MASK)
#define VMX_EPT_MT_MASK (7ull << VMX_EPT_MT_EPTE_SHIFT)
/* The mask to use to trigger an EPT Misconfiguration in order to track MMIO */
#define VMX_EPT_MISCONFIG_WX_VALUE (VMX_EPT_WRITABLE_MASK | \
VMX_EPT_EXECUTABLE_MASK)
#define VMX_EPT_IDENTITY_PAGETABLE_ADDR 0xfffbc000ul
@ -499,6 +507,22 @@ struct vmx_msr_entry {
#define ENTRY_FAIL_NMI 3
#define ENTRY_FAIL_VMCS_LINK_PTR 4
/*
* Exit Qualifications for EPT Violations
*/
#define EPT_VIOLATION_ACC_READ_BIT 0
#define EPT_VIOLATION_ACC_WRITE_BIT 1
#define EPT_VIOLATION_ACC_INSTR_BIT 2
#define EPT_VIOLATION_READABLE_BIT 3
#define EPT_VIOLATION_WRITABLE_BIT 4
#define EPT_VIOLATION_EXECUTABLE_BIT 5
#define EPT_VIOLATION_ACC_READ (1 << EPT_VIOLATION_ACC_READ_BIT)
#define EPT_VIOLATION_ACC_WRITE (1 << EPT_VIOLATION_ACC_WRITE_BIT)
#define EPT_VIOLATION_ACC_INSTR (1 << EPT_VIOLATION_ACC_INSTR_BIT)
#define EPT_VIOLATION_READABLE (1 << EPT_VIOLATION_READABLE_BIT)
#define EPT_VIOLATION_WRITABLE (1 << EPT_VIOLATION_WRITABLE_BIT)
#define EPT_VIOLATION_EXECUTABLE (1 << EPT_VIOLATION_EXECUTABLE_BIT)
/*
* VM-instruction error numbers
*/

9
arch/x86/include/uapi/asm/kvm_para.h
View File

@ -50,6 +50,15 @@ struct kvm_steal_time {
__u32 pad[11];
};
#define KVM_CLOCK_PAIRING_WALLCLOCK 0
struct kvm_clock_pairing {
__s64 sec;
__s64 nsec;
__u64 tsc;
__u32 flags;
__u32 pad[9];
};
#define KVM_STEAL_ALIGNMENT_BITS 5
#define KVM_STEAL_VALID_BITS ((-1ULL << (KVM_STEAL_ALIGNMENT_BITS + 1)))
#define KVM_STEAL_RESERVED_MASK (((1 << KVM_STEAL_ALIGNMENT_BITS) - 1 ) << 1)

9
arch/x86/kernel/asm-offsets_64.c
View File

@ -13,6 +13,10 @@ static char syscalls_ia32[] = {
#include <asm/syscalls_32.h>
};
#if defined(CONFIG_KVM_GUEST) && defined(CONFIG_PARAVIRT_SPINLOCKS)
#include <asm/kvm_para.h>
#endif
int main(void)
{
#ifdef CONFIG_PARAVIRT
@ -22,6 +26,11 @@ int main(void)
BLANK();
#endif
#if defined(CONFIG_KVM_GUEST) && defined(CONFIG_PARAVIRT_SPINLOCKS)
OFFSET(KVM_STEAL_TIME_preempted, kvm_steal_time, preempted);
BLANK();
#endif
#define ENTRY(entry) OFFSET(pt_regs_ ## entry, pt_regs, entry)
ENTRY(bx);
ENTRY(cx);

5
arch/x86/kernel/ioport.c
View File

@ -16,6 +16,7 @@
#include <linux/syscalls.h>
#include <linux/bitmap.h>
#include <asm/syscalls.h>
#include <asm/desc.h>
/*
* this changes the io permissions bitmap in the current task.
@ -45,6 +46,10 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
memset(bitmap, 0xff, IO_BITMAP_BYTES);
t->io_bitmap_ptr = bitmap;
set_thread_flag(TIF_IO_BITMAP);
preempt_disable();
refresh_TR();
preempt_enable();
}
/*

26
arch/x86/kernel/kvm.c
View File

@ -589,7 +589,8 @@ out:
local_irq_restore(flags);
}
__visible bool __kvm_vcpu_is_preempted(int cpu)
#ifdef CONFIG_X86_32
__visible bool __kvm_vcpu_is_preempted(long cpu)
{
struct kvm_steal_time *src = &per_cpu(steal_time, cpu);
@ -597,6 +598,29 @@ __visible bool __kvm_vcpu_is_preempted(int cpu)
}
PV_CALLEE_SAVE_REGS_THUNK(__kvm_vcpu_is_preempted);
#else
#include <asm/asm-offsets.h>
extern bool __raw_callee_save___kvm_vcpu_is_preempted(long);
/*
* Hand-optimize version for x86-64 to avoid 8 64-bit register saving and
* restoring to/from the stack.
*/
asm(
".pushsection .text;"
".global __raw_callee_save___kvm_vcpu_is_preempted;"
".type __raw_callee_save___kvm_vcpu_is_preempted, @function;"
"__raw_callee_save___kvm_vcpu_is_preempted:"
"movq __per_cpu_offset(,%rdi,8), %rax;"
"cmpb $0, " __stringify(KVM_STEAL_TIME_preempted) "+steal_time(%rax);"
"setne %al;"
"ret;"
".popsection");
#endif
/*
* Setup pv_lock_ops to exploit KVM_FEATURE_PV_UNHALT if present.
*/

5
arch/x86/kernel/kvmclock.c
View File

@ -28,6 +28,7 @@
#include <asm/x86_init.h>
#include <asm/reboot.h>
#include <asm/kvmclock.h>
static int kvmclock __ro_after_init = 1;
static int msr_kvm_system_time = MSR_KVM_SYSTEM_TIME;
@ -49,6 +50,7 @@ struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void)
{
return hv_clock;
}
EXPORT_SYMBOL_GPL(pvclock_pvti_cpu0_va);
/*
* The wallclock is the time of day when we booted. Since then, some time may
@ -174,13 +176,14 @@ bool kvm_check_and_clear_guest_paused(void)
return ret;
}
static struct clocksource kvm_clock = {
struct clocksource kvm_clock = {
.name = "kvm-clock",
.read = kvm_clock_get_cycles,
.rating = 400,
.mask = CLOCKSOURCE_MASK(64),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
EXPORT_SYMBOL_GPL(kvm_clock);
int kvm_register_clock(char *txt)
{

2
arch/x86/kernel/paravirt-spinlocks.c
View File

@ -20,7 +20,7 @@ bool pv_is_native_spin_unlock(void)
__raw_callee_save___native_queued_spin_unlock;
}
__visible bool __native_vcpu_is_preempted(int cpu)
__visible bool __native_vcpu_is_preempted(long cpu)
{
return false;
}

10
arch/x86/kernel/process.c
View File

@ -32,6 +32,7 @@
#include <asm/mce.h>
#include <asm/vm86.h>
#include <asm/switch_to.h>
#include <asm/desc.h>
/*
* per-CPU TSS segments. Threads are completely 'soft' on Linux,
@ -64,6 +65,9 @@ __visible DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, cpu_tss) = {
};
EXPORT_PER_CPU_SYMBOL(cpu_tss);
DEFINE_PER_CPU(bool, need_tr_refresh);
EXPORT_PER_CPU_SYMBOL_GPL(need_tr_refresh);
/*
* this gets called so that we can store lazy state into memory and copy the
* current task into the new thread.
@ -209,6 +213,12 @@ void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p,
*/
memcpy(tss->io_bitmap, next->io_bitmap_ptr,
max(prev->io_bitmap_max, next->io_bitmap_max));
/*
* Make sure that the TSS limit is correct for the CPU
* to notice the IO bitmap.
*/
refresh_TR();
} else if (test_tsk_thread_flag(prev_p, TIF_IO_BITMAP)) {
/*
* Clear any possible leftover bits:

10
arch/x86/kvm/cpuid.c
View File

@ -123,8 +123,6 @@ int kvm_update_cpuid(struct kvm_vcpu *vcpu)
if (best && (best->eax & (F(XSAVES) | F(XSAVEC))))
best->ebx = xstate_required_size(vcpu->arch.xcr0, true);
kvm_x86_ops->fpu_activate(vcpu);
/*
* The existing code assumes virtual address is 48-bit in the canonical
* address checks; exit if it is ever changed.
@ -383,7 +381,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
/* cpuid 7.0.ecx*/
const u32 kvm_cpuid_7_0_ecx_x86_features =
F(AVX512VBMI) | F(PKU) | 0 /*OSPKE*/;
F(AVX512VBMI) | F(PKU) | 0 /*OSPKE*/ | F(AVX512_VPOPCNTDQ);
/* cpuid 7.0.edx*/
const u32 kvm_cpuid_7_0_edx_x86_features =
@ -861,12 +859,6 @@ void kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
if (!best)
best = check_cpuid_limit(vcpu, function, index);
/*
* Perfmon not yet supported for L2 guest.
*/
if (is_guest_mode(vcpu) && function == 0xa)
best = NULL;
if (best) {
*eax = best->eax;
*ebx = best->ebx;

20
arch/x86/kvm/emulate.c
View File

@ -173,6 +173,7 @@
#define NearBranch ((u64)1 << 52) /* Near branches */
#define No16 ((u64)1 << 53) /* No 16 bit operand */
#define IncSP ((u64)1 << 54) /* SP is incremented before ModRM calc */
#define TwoMemOp ((u64)1 << 55) /* Instruction has two memory operand */
#define DstXacc (DstAccLo | SrcAccHi | SrcWrite)
@ -4298,7 +4299,7 @@ static const struct opcode group1[] = {
};
static const struct opcode group1A[] = {
I(DstMem | SrcNone | Mov | Stack | IncSP, em_pop), N, N, N, N, N, N, N,
I(DstMem | SrcNone | Mov | Stack | IncSP | TwoMemOp, em_pop), N, N, N, N, N, N, N,
};
static const struct opcode group2[] = {
@ -4336,7 +4337,7 @@ static const struct opcode group5[] = {
I(SrcMemFAddr | ImplicitOps, em_call_far),
I(SrcMem | NearBranch, em_jmp_abs),
I(SrcMemFAddr | ImplicitOps, em_jmp_far),
I(SrcMem | Stack, em_push), D(Undefined),
I(SrcMem | Stack | TwoMemOp, em_push), D(Undefined),
};
static const struct opcode group6[] = {
@ -4556,8 +4557,8 @@ static const struct opcode opcode_table[256] = {
/* 0xA0 - 0xA7 */
I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),
I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov),
I2bv(SrcSI | DstDI | Mov | String, em_mov),
F2bv(SrcSI | DstDI | String | NoWrite, em_cmp_r),
I2bv(SrcSI | DstDI | Mov | String | TwoMemOp, em_mov),
F2bv(SrcSI | DstDI | String | NoWrite | TwoMemOp, em_cmp_r),
/* 0xA8 - 0xAF */
F2bv(DstAcc | SrcImm | NoWrite, em_test),
I2bv(SrcAcc | DstDI | Mov | String, em_mov),
@ -5671,3 +5672,14 @@ void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt)
{
writeback_registers(ctxt);
}
bool emulator_can_use_gpa(struct x86_emulate_ctxt *ctxt)
{
if (ctxt->rep_prefix && (ctxt->d & String))
return false;
if (ctxt->d & TwoMemOp)
return false;
return true;
}

4
arch/x86/kvm/hyperv.c
View File

@ -305,13 +305,13 @@ static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
return -ENOENT;
memset(&irq, 0, sizeof(irq));
irq.dest_id = kvm_apic_id(vcpu->arch.apic);
irq.shorthand = APIC_DEST_SELF;
irq.dest_mode = APIC_DEST_PHYSICAL;
irq.delivery_mode = APIC_DM_FIXED;
irq.vector = vector;
irq.level = 1;
ret = kvm_irq_delivery_to_apic(vcpu->kvm, NULL, &irq, NULL);
ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq, NULL);
trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret);
return ret;
}

16
arch/x86/kvm/i8259.c
View File

@ -598,14 +598,14 @@ static const struct kvm_io_device_ops picdev_eclr_ops = {
.write = picdev_eclr_write,
};
struct kvm_pic *kvm_create_pic(struct kvm *kvm)
int kvm_pic_init(struct kvm *kvm)
{
struct kvm_pic *s;
int ret;
s = kzalloc(sizeof(struct kvm_pic), GFP_KERNEL);
if (!s)
return NULL;
return -ENOMEM;
spin_lock_init(&s->lock);
s->kvm = kvm;
s->pics[0].elcr_mask = 0xf8;
@ -635,7 +635,9 @@ struct kvm_pic *kvm_create_pic(struct kvm *kvm)
mutex_unlock(&kvm->slots_lock);
return s;
kvm->arch.vpic = s;
return 0;
fail_unreg_1:
kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &s->dev_slave);
@ -648,13 +650,17 @@ fail_unlock:
kfree(s);
return NULL;
return ret;
}
void kvm_destroy_pic(struct kvm_pic *vpic)
void kvm_pic_destroy(struct kvm *kvm)
{
struct kvm_pic *vpic = kvm->arch.vpic;
kvm_io_bus_unregister_dev(vpic->kvm, KVM_PIO_BUS, &vpic->dev_master);
kvm_io_bus_unregister_dev(vpic->kvm, KVM_PIO_BUS, &vpic->dev_slave);
kvm_io_bus_unregister_dev(vpic->kvm, KVM_PIO_BUS, &vpic->dev_eclr);
kvm->arch.vpic = NULL;
kfree(vpic);
}

19
arch/x86/kvm/irq.h
View File

@ -73,8 +73,8 @@ struct kvm_pic {
unsigned long irq_states[PIC_NUM_PINS];
};
struct kvm_pic *kvm_create_pic(struct kvm *kvm);
void kvm_destroy_pic(struct kvm_pic *vpic);
int kvm_pic_init(struct kvm *kvm);
void kvm_pic_destroy(struct kvm *kvm);
int kvm_pic_read_irq(struct kvm *kvm);
void kvm_pic_update_irq(struct kvm_pic *s);
@ -93,18 +93,19 @@ static inline int pic_in_kernel(struct kvm *kvm)
static inline int irqchip_split(struct kvm *kvm)
{
return kvm->arch.irqchip_split;
return kvm->arch.irqchip_mode == KVM_IRQCHIP_SPLIT;
}
static inline int irqchip_kernel(struct kvm *kvm)
{
return kvm->arch.irqchip_mode == KVM_IRQCHIP_KERNEL;
}
static inline int irqchip_in_kernel(struct kvm *kvm)
{
struct kvm_pic *vpic = pic_irqchip(kvm);
bool ret;
bool ret = kvm->arch.irqchip_mode != KVM_IRQCHIP_NONE;
ret = (vpic != NULL);
ret |= irqchip_split(kvm);
/* Read vpic before kvm->irq_routing. */
/* Matches with wmb after initializing kvm->irq_routing. */
smp_rmb();
return ret;
}

29
arch/x86/kvm/irq_comm.c
View File

@ -41,15 +41,6 @@ static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
bool line_status)
{
struct kvm_pic *pic = pic_irqchip(kvm);
/*
* XXX: rejecting pic routes when pic isn't in use would be better,
* but the default routing table is installed while kvm->arch.vpic is
* NULL and KVM_CREATE_IRQCHIP can race with KVM_IRQ_LINE.
*/
if (!pic)
return -1;
return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level);
}
@ -58,10 +49,6 @@ static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
bool line_status)
{
struct kvm_ioapic *ioapic = kvm->arch.vioapic;
if (!ioapic)
return -1;
return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level,
line_status);
}
@ -297,16 +284,20 @@ int kvm_set_routing_entry(struct kvm *kvm,
case KVM_IRQ_ROUTING_IRQCHIP:
delta = 0;
switch (ue->u.irqchip.irqchip) {
case KVM_IRQCHIP_PIC_MASTER:
e->set = kvm_set_pic_irq;
max_pin = PIC_NUM_PINS;
break;
case KVM_IRQCHIP_PIC_SLAVE:
delta = 8;
/* fall through */
case KVM_IRQCHIP_PIC_MASTER:
if (!pic_in_kernel(kvm))
goto out;
e->set = kvm_set_pic_irq;
max_pin = PIC_NUM_PINS;
delta = 8;
break;
case KVM_IRQCHIP_IOAPIC:
if (!ioapic_in_kernel(kvm))
goto out;
max_pin = KVM_IOAPIC_NUM_PINS;
e->set = kvm_set_ioapic_irq;
break;
@ -409,7 +400,7 @@ int kvm_setup_empty_irq_routing(struct kvm *kvm)
void kvm_arch_post_irq_routing_update(struct kvm *kvm)
{
if (ioapic_in_kernel(kvm) || !irqchip_in_kernel(kvm))
if (!irqchip_split(kvm))
return;
kvm_make_scan_ioapic_request(kvm);
}

197
arch/x86/kvm/lapic.c
View File

@ -115,6 +115,16 @@ static inline int apic_enabled(struct kvm_lapic *apic)
(LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
static inline u8 kvm_xapic_id(struct kvm_lapic *apic)
{
return kvm_lapic_get_reg(apic, APIC_ID) >> 24;
}
static inline u32 kvm_x2apic_id(struct kvm_lapic *apic)
{
return apic->vcpu->vcpu_id;
}
static inline bool kvm_apic_map_get_logical_dest(struct kvm_apic_map *map,
u32 dest_id, struct kvm_lapic ***cluster, u16 *mask) {
switch (map->mode) {
@ -159,13 +169,13 @@ static void recalculate_apic_map(struct kvm *kvm)
struct kvm_apic_map *new, *old = NULL;
struct kvm_vcpu *vcpu;
int i;
u32 max_id = 255;
u32 max_id = 255; /* enough space for any xAPIC ID */
mutex_lock(&kvm->arch.apic_map_lock);
kvm_for_each_vcpu(i, vcpu, kvm)
if (kvm_apic_present(vcpu))
max_id = max(max_id, kvm_apic_id(vcpu->arch.apic));
max_id = max(max_id, kvm_x2apic_id(vcpu->arch.apic));
new = kvm_kvzalloc(sizeof(struct kvm_apic_map) +
sizeof(struct kvm_lapic *) * ((u64)max_id + 1));
@ -179,16 +189,28 @@ static void recalculate_apic_map(struct kvm *kvm)
struct kvm_lapic *apic = vcpu->arch.apic;
struct kvm_lapic **cluster;
u16 mask;
u32 ldr, aid;
u32 ldr;
u8 xapic_id;
u32 x2apic_id;
if (!kvm_apic_present(vcpu))
continue;
aid = kvm_apic_id(apic);
ldr = kvm_lapic_get_reg(apic, APIC_LDR);
xapic_id = kvm_xapic_id(apic);
x2apic_id = kvm_x2apic_id(apic);
if (aid <= new->max_apic_id)
new->phys_map[aid] = apic;
/* Hotplug hack: see kvm_apic_match_physical_addr(), ... */
if ((apic_x2apic_mode(apic) || x2apic_id > 0xff) &&
x2apic_id <= new->max_apic_id)
new->phys_map[x2apic_id] = apic;
/*
* ... xAPIC ID of VCPUs with APIC ID > 0xff will wrap-around,
* prevent them from masking VCPUs with APIC ID <= 0xff.
*/
if (!apic_x2apic_mode(apic) && !new->phys_map[xapic_id])
new->phys_map[xapic_id] = apic;
ldr = kvm_lapic_get_reg(apic, APIC_LDR);
if (apic_x2apic_mode(apic)) {
new->mode |= KVM_APIC_MODE_X2APIC;
@ -250,6 +272,8 @@ static inline void kvm_apic_set_x2apic_id(struct kvm_lapic *apic, u32 id)
{
u32 ldr = ((id >> 4) << 16) | (1 << (id & 0xf));
WARN_ON_ONCE(id != apic->vcpu->vcpu_id);
kvm_lapic_set_reg(apic, APIC_ID, id);
kvm_lapic_set_reg(apic, APIC_LDR, ldr);
recalculate_apic_map(apic->vcpu->kvm);
@ -317,7 +341,7 @@ static int find_highest_vector(void *bitmap)
vec >= 0; vec -= APIC_VECTORS_PER_REG) {
reg = bitmap + REG_POS(vec);
if (*reg)
return fls(*reg) - 1 + vec;
return __fls(*reg) + vec;
}
return -1;
@ -337,27 +361,32 @@ static u8 count_vectors(void *bitmap)
return count;
}
void __kvm_apic_update_irr(u32 *pir, void *regs)
int __kvm_apic_update_irr(u32 *pir, void *regs)
{
u32 i, pir_val;
u32 i, vec;
u32 pir_val, irr_val;
int max_irr = -1;
for (i = 0; i <= 7; i++) {
for (i = vec = 0; i <= 7; i++, vec += 32) {
pir_val = READ_ONCE(pir[i]);
irr_val = *((u32 *)(regs + APIC_IRR + i * 0x10));
if (pir_val) {
pir_val = xchg(&pir[i], 0);
*((u32 *)(regs + APIC_IRR + i * 0x10)) |= pir_val;
irr_val |= xchg(&pir[i], 0);
*((u32 *)(regs + APIC_IRR + i * 0x10)) = irr_val;
}
if (irr_val)
max_irr = __fls(irr_val) + vec;
}
return max_irr;
}
EXPORT_SYMBOL_GPL(__kvm_apic_update_irr);
void kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir)
int kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir)
{
struct kvm_lapic *apic = vcpu->arch.apic;
__kvm_apic_update_irr(pir, apic->regs);
kvm_make_request(KVM_REQ_EVENT, vcpu);
return __kvm_apic_update_irr(pir, apic->regs);
}
EXPORT_SYMBOL_GPL(kvm_apic_update_irr);
@ -377,8 +406,6 @@ static inline int apic_find_highest_irr(struct kvm_lapic *apic)
if (!apic->irr_pending)
return -1;
if (apic->vcpu->arch.apicv_active)
kvm_x86_ops->sync_pir_to_irr(apic->vcpu);
result = apic_search_irr(apic);
ASSERT(result == -1 || result >= 16);
@ -392,9 +419,10 @@ static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
vcpu = apic->vcpu;
if (unlikely(vcpu->arch.apicv_active)) {
/* try to update RVI */
/* need to update RVI */
apic_clear_vector(vec, apic->regs + APIC_IRR);
kvm_make_request(KVM_REQ_EVENT, vcpu);
kvm_x86_ops->hwapic_irr_update(vcpu,
apic_find_highest_irr(apic));
} else {
apic->irr_pending = false;
apic_clear_vector(vec, apic->regs + APIC_IRR);
@ -484,6 +512,7 @@ int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
*/
return apic_find_highest_irr(vcpu->arch.apic);
}
EXPORT_SYMBOL_GPL(kvm_lapic_find_highest_irr);
static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
int vector, int level, int trig_mode,
@ -500,16 +529,14 @@ int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
static int pv_eoi_put_user(struct kvm_vcpu *vcpu, u8 val)
{
return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, &val,
sizeof(val));
return kvm_vcpu_write_guest_cached(vcpu, &vcpu->arch.pv_eoi.data, &val,
sizeof(val));
}
static int pv_eoi_get_user(struct kvm_vcpu *vcpu, u8 *val)
{
return kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, val,
sizeof(*val));
return kvm_vcpu_read_guest_cached(vcpu, &vcpu->arch.pv_eoi.data, val,
sizeof(*val));
}
static inline bool pv_eoi_enabled(struct kvm_vcpu *vcpu)
@ -546,7 +573,19 @@ static void pv_eoi_clr_pending(struct kvm_vcpu *vcpu)
__clear_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
}
static void apic_update_ppr(struct kvm_lapic *apic)
static int apic_has_interrupt_for_ppr(struct kvm_lapic *apic, u32 ppr)
{
int highest_irr;
if (kvm_x86_ops->sync_pir_to_irr && apic->vcpu->arch.apicv_active)
highest_irr = kvm_x86_ops->sync_pir_to_irr(apic->vcpu);
else
highest_irr = apic_find_highest_irr(apic);
if (highest_irr == -1 || (highest_irr & 0xF0) <= ppr)
return -1;
return highest_irr;
}
static bool __apic_update_ppr(struct kvm_lapic *apic, u32 *new_ppr)
{
u32 tpr, isrv, ppr, old_ppr;
int isr;
@ -564,13 +603,28 @@ static void apic_update_ppr(struct kvm_lapic *apic)
apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
apic, ppr, isr, isrv);
if (old_ppr != ppr) {
*new_ppr = ppr;
if (old_ppr != ppr)
kvm_lapic_set_reg(apic, APIC_PROCPRI, ppr);
if (ppr < old_ppr)
kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
}
return ppr < old_ppr;
}
static void apic_update_ppr(struct kvm_lapic *apic)
{
u32 ppr;
if (__apic_update_ppr(apic, &ppr) &&
apic_has_interrupt_for_ppr(apic, ppr) != -1)
kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
}
void kvm_apic_update_ppr(struct kvm_vcpu *vcpu)
{
apic_update_ppr(vcpu->arch.apic);
}
EXPORT_SYMBOL_GPL(kvm_apic_update_ppr);
static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
{
kvm_lapic_set_reg(apic, APIC_TASKPRI, tpr);
@ -579,10 +633,8 @@ static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
static bool kvm_apic_broadcast(struct kvm_lapic *apic, u32 mda)
{
if (apic_x2apic_mode(apic))
return mda == X2APIC_BROADCAST;
return GET_APIC_DEST_FIELD(mda) == APIC_BROADCAST;
return mda == (apic_x2apic_mode(apic) ?
X2APIC_BROADCAST : APIC_BROADCAST);
}
static bool kvm_apic_match_physical_addr(struct kvm_lapic *apic, u32 mda)
@ -591,9 +643,18 @@ static bool kvm_apic_match_physical_addr(struct kvm_lapic *apic, u32 mda)
return true;
if (apic_x2apic_mode(apic))
return mda == kvm_apic_id(apic);
return mda == kvm_x2apic_id(apic);
return mda == SET_APIC_DEST_FIELD(kvm_apic_id(apic));
/*
* Hotplug hack: Make LAPIC in xAPIC mode also accept interrupts as if
* it were in x2APIC mode. Hotplugged VCPUs start in xAPIC mode and
* this allows unique addressing of VCPUs with APIC ID over 0xff.
* The 0xff condition is needed because writeable xAPIC ID.
*/
if (kvm_x2apic_id(apic) > 0xff && mda == kvm_x2apic_id(apic))
return true;
return mda == kvm_xapic_id(apic);
}
static bool kvm_apic_match_logical_addr(struct kvm_lapic *apic, u32 mda)
@ -610,7 +671,6 @@ static bool kvm_apic_match_logical_addr(struct kvm_lapic *apic, u32 mda)
&& (logical_id & mda & 0xffff) != 0;
logical_id = GET_APIC_LOGICAL_ID(logical_id);
mda = GET_APIC_DEST_FIELD(mda);
switch (kvm_lapic_get_reg(apic, APIC_DFR)) {
case APIC_DFR_FLAT:
@ -627,9 +687,9 @@ static bool kvm_apic_match_logical_addr(struct kvm_lapic *apic, u32 mda)
/* The KVM local APIC implementation has two quirks:
*
* - the xAPIC MDA stores the destination at bits 24-31, while this
* is not true of struct kvm_lapic_irq's dest_id field. This is
* just a quirk in the API and is not problematic.
* - Real hardware delivers interrupts destined to x2APIC ID > 0xff to LAPICs
* in xAPIC mode if the "destination & 0xff" matches its xAPIC ID.
* KVM doesn't do that aliasing.
*
* - in-kernel IOAPIC messages have to be delivered directly to
* x2APIC, because the kernel does not support interrupt remapping.
@ -645,13 +705,12 @@ static u32 kvm_apic_mda(struct kvm_vcpu *vcpu, unsigned int dest_id,
struct kvm_lapic *source, struct kvm_lapic *target)
{
bool ipi = source != NULL;
bool x2apic_mda = apic_x2apic_mode(ipi ? source : target);
if (!vcpu->kvm->arch.x2apic_broadcast_quirk_disabled &&
!ipi && dest_id == APIC_BROADCAST && x2apic_mda)
!ipi && dest_id == APIC_BROADCAST && apic_x2apic_mode(target))
return X2APIC_BROADCAST;
return x2apic_mda ? dest_id : SET_APIC_DEST_FIELD(dest_id);
return dest_id;
}
bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
@ -1907,9 +1966,9 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
vcpu->arch.apic_arb_prio = 0;
vcpu->arch.apic_attention = 0;
apic_debug("%s: vcpu=%p, id=%d, base_msr="
apic_debug("%s: vcpu=%p, id=0x%x, base_msr="
"0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
vcpu, kvm_apic_id(apic),
vcpu, kvm_lapic_get_reg(apic, APIC_ID),
vcpu->arch.apic_base, apic->base_address);
}
@ -2021,17 +2080,13 @@ nomem:
int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;
int highest_irr;
u32 ppr;
if (!apic_enabled(apic))
return -1;
apic_update_ppr(apic);
highest_irr = apic_find_highest_irr(apic);
if ((highest_irr == -1) ||
((highest_irr & 0xF0) <= kvm_lapic_get_reg(apic, APIC_PROCPRI)))
return -1;
return highest_irr;
__apic_update_ppr(apic, &ppr);
return apic_has_interrupt_for_ppr(apic, ppr);
}
int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
@ -2067,6 +2122,7 @@ int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
{
int vector = kvm_apic_has_interrupt(vcpu);
struct kvm_lapic *apic = vcpu->arch.apic;
u32 ppr;
if (vector == -1)
return -1;
@ -2078,13 +2134,23 @@ int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
* because the process would deliver it through the IDT.
*/
apic_set_isr(vector, apic);
apic_update_ppr(apic);
apic_clear_irr(vector, apic);
if (test_bit(vector, vcpu_to_synic(vcpu)->auto_eoi_bitmap)) {
apic_clear_isr(vector, apic);
/*
* For auto-EOI interrupts, there might be another pending
* interrupt above PPR, so check whether to raise another
* KVM_REQ_EVENT.
*/
apic_update_ppr(apic);
} else {
/*
* For normal interrupts, PPR has been raised and there cannot
* be a higher-priority pending interrupt---except if there was
* a concurrent interrupt injection, but that would have
* triggered KVM_REQ_EVENT already.
*/
apic_set_isr(vector, apic);
__apic_update_ppr(apic, &ppr);
}
return vector;
@ -2145,8 +2211,7 @@ int kvm_apic_set_state(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s)
1 : count_vectors(apic->regs + APIC_ISR);
apic->highest_isr_cache = -1;
if (vcpu->arch.apicv_active) {
if (kvm_x86_ops->apicv_post_state_restore)
kvm_x86_ops->apicv_post_state_restore(vcpu);
kvm_x86_ops->apicv_post_state_restore(vcpu);
kvm_x86_ops->hwapic_irr_update(vcpu,
apic_find_highest_irr(apic));
kvm_x86_ops->hwapic_isr_update(vcpu,
@ -2220,8 +2285,8 @@ void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
return;
if (kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
sizeof(u32)))
if (kvm_vcpu_read_guest_cached(vcpu, &vcpu->arch.apic->vapic_cache, &data,
sizeof(u32)))
return;
apic_set_tpr(vcpu->arch.apic, data & 0xff);
@ -2273,14 +2338,14 @@ void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
max_isr = 0;
data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
sizeof(u32));
kvm_vcpu_write_guest_cached(vcpu, &vcpu->arch.apic->vapic_cache, &data,
sizeof(u32));
}
int kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
{
if (vapic_addr) {
if (kvm_gfn_to_hva_cache_init(vcpu->kvm,
if (kvm_vcpu_gfn_to_hva_cache_init(vcpu,
&vcpu->arch.apic->vapic_cache,
vapic_addr, sizeof(u32)))
return -EINVAL;
@ -2374,7 +2439,7 @@ int kvm_lapic_enable_pv_eoi(struct kvm_vcpu *vcpu, u64 data)
vcpu->arch.pv_eoi.msr_val = data;
if (!pv_eoi_enabled(vcpu))
return 0;
return kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.pv_eoi.data,
return kvm_vcpu_gfn_to_hva_cache_init(vcpu, &vcpu->arch.pv_eoi.data,
addr, sizeof(u8));
}

16
arch/x86/kvm/lapic.h
View File

@ -71,8 +71,9 @@ int kvm_lapic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int short_hand, unsigned int dest, int dest_mode);
void __kvm_apic_update_irr(u32 *pir, void *regs);
void kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir);
int __kvm_apic_update_irr(u32 *pir, void *regs);
int kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir);
void kvm_apic_update_ppr(struct kvm_vcpu *vcpu);
int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
struct dest_map *dest_map);
int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type);
@ -203,17 +204,6 @@ static inline int kvm_lapic_latched_init(struct kvm_vcpu *vcpu)
return lapic_in_kernel(vcpu) && test_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events);
}
static inline u32 kvm_apic_id(struct kvm_lapic *apic)
{
/* To avoid a race between apic_base and following APIC_ID update when
* switching to x2apic_mode, the x2apic mode returns initial x2apic id.
*/
if (apic_x2apic_mode(apic))
return apic->vcpu->vcpu_id;
return kvm_lapic_get_reg(apic, APIC_ID) >> 24;
}
bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector);
void wait_lapic_expire(struct kvm_vcpu *vcpu);

517
arch/x86/kvm/mmu.c
View File

@ -37,6 +37,8 @@
#include <linux/srcu.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/hash.h>
#include <linux/kern_levels.h>
#include <asm/page.h>
#include <asm/cmpxchg.h>
@ -129,6 +131,10 @@ module_param(dbg, bool, 0644);
#define ACC_USER_MASK PT_USER_MASK
#define ACC_ALL (ACC_EXEC_MASK | ACC_WRITE_MASK | ACC_USER_MASK)
/* The mask for the R/X bits in EPT PTEs */
#define PT64_EPT_READABLE_MASK 0x1ull
#define PT64_EPT_EXECUTABLE_MASK 0x4ull
#include <trace/events/kvm.h>
#define CREATE_TRACE_POINTS
@ -178,15 +184,40 @@ static u64 __read_mostly shadow_dirty_mask;
static u64 __read_mostly shadow_mmio_mask;
static u64 __read_mostly shadow_present_mask;
/*
* The mask/value to distinguish a PTE that has been marked not-present for
* access tracking purposes.
* The mask would be either 0 if access tracking is disabled, or
* SPTE_SPECIAL_MASK|VMX_EPT_RWX_MASK if access tracking is enabled.
*/
static u64 __read_mostly shadow_acc_track_mask;
static const u64 shadow_acc_track_value = SPTE_SPECIAL_MASK;
/*
* The mask/shift to use for saving the original R/X bits when marking the PTE
* as not-present for access tracking purposes. We do not save the W bit as the
* PTEs being access tracked also need to be dirty tracked, so the W bit will be
* restored only when a write is attempted to the page.
*/
static const u64 shadow_acc_track_saved_bits_mask = PT64_EPT_READABLE_MASK |
PT64_EPT_EXECUTABLE_MASK;
static const u64 shadow_acc_track_saved_bits_shift = PT64_SECOND_AVAIL_BITS_SHIFT;
static void mmu_spte_set(u64 *sptep, u64 spte);
static void mmu_free_roots(struct kvm_vcpu *vcpu);
void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask)
{
shadow_mmio_mask = mmio_mask;
shadow_mmio_mask = mmio_mask | SPTE_SPECIAL_MASK;
}
EXPORT_SYMBOL_GPL(kvm_mmu_set_mmio_spte_mask);
static inline bool is_access_track_spte(u64 spte)
{
/* Always false if shadow_acc_track_mask is zero. */
return (spte & shadow_acc_track_mask) == shadow_acc_track_value;
}
/*
* the low bit of the generation number is always presumed to be zero.
* This disables mmio caching during memslot updates. The concept is
@ -284,17 +315,35 @@ static bool check_mmio_spte(struct kvm_vcpu *vcpu, u64 spte)
}
void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
u64 dirty_mask, u64 nx_mask, u64 x_mask, u64 p_mask)
u64 dirty_mask, u64 nx_mask, u64 x_mask, u64 p_mask,
u64 acc_track_mask)
{
if (acc_track_mask != 0)
acc_track_mask |= SPTE_SPECIAL_MASK;
shadow_user_mask = user_mask;
shadow_accessed_mask = accessed_mask;
shadow_dirty_mask = dirty_mask;
shadow_nx_mask = nx_mask;
shadow_x_mask = x_mask;
shadow_present_mask = p_mask;
shadow_acc_track_mask = acc_track_mask;
WARN_ON(shadow_accessed_mask != 0 && shadow_acc_track_mask != 0);
}
EXPORT_SYMBOL_GPL(kvm_mmu_set_mask_ptes);
void kvm_mmu_clear_all_pte_masks(void)
{
shadow_user_mask = 0;
shadow_accessed_mask = 0;
shadow_dirty_mask = 0;
shadow_nx_mask = 0;
shadow_x_mask = 0;
shadow_mmio_mask = 0;
shadow_present_mask = 0;
shadow_acc_track_mask = 0;
}
static int is_cpuid_PSE36(void)
{
return 1;
@ -307,7 +356,7 @@ static int is_nx(struct kvm_vcpu *vcpu)
static int is_shadow_present_pte(u64 pte)
{
return (pte & 0xFFFFFFFFull) && !is_mmio_spte(pte);
return (pte != 0) && !is_mmio_spte(pte);
}
static int is_large_pte(u64 pte)
@ -324,6 +373,11 @@ static int is_last_spte(u64 pte, int level)
return 0;
}
static bool is_executable_pte(u64 spte)
{
return (spte & (shadow_x_mask | shadow_nx_mask)) == shadow_x_mask;
}
static kvm_pfn_t spte_to_pfn(u64 pte)
{
return (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
@ -473,7 +527,7 @@ retry:
}
#endif
static bool spte_is_locklessly_modifiable(u64 spte)
static bool spte_can_locklessly_be_made_writable(u64 spte)
{
return (spte & (SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE)) ==
(SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE);
@ -481,36 +535,38 @@ static bool spte_is_locklessly_modifiable(u64 spte)
static bool spte_has_volatile_bits(u64 spte)
{
if (!is_shadow_present_pte(spte))
return false;
/*
* Always atomically update spte if it can be updated
* out of mmu-lock, it can ensure dirty bit is not lost,
* also, it can help us to get a stable is_writable_pte()
* to ensure tlb flush is not missed.
*/
if (spte_is_locklessly_modifiable(spte))
if (spte_can_locklessly_be_made_writable(spte) ||
is_access_track_spte(spte))
return true;
if (!shadow_accessed_mask)
return false;
if (shadow_accessed_mask) {
if ((spte & shadow_accessed_mask) == 0 ||
(is_writable_pte(spte) && (spte & shadow_dirty_mask) == 0))
return true;
}
if (!is_shadow_present_pte(spte))
return false;
if ((spte & shadow_accessed_mask) &&
(!is_writable_pte(spte) || (spte & shadow_dirty_mask)))
return false;
return true;
return false;
}
static bool spte_is_bit_cleared(u64 old_spte, u64 new_spte, u64 bit_mask)
static bool is_accessed_spte(u64 spte)
{
return (old_spte & bit_mask) && !(new_spte & bit_mask);
return shadow_accessed_mask ? spte & shadow_accessed_mask
: !is_access_track_spte(spte);
}
static bool spte_is_bit_changed(u64 old_spte, u64 new_spte, u64 bit_mask)
static bool is_dirty_spte(u64 spte)
{
return (old_spte & bit_mask) != (new_spte & bit_mask);
return shadow_dirty_mask ? spte & shadow_dirty_mask
: spte & PT_WRITABLE_MASK;
}
/* Rules for using mmu_spte_set:
@ -525,6 +581,31 @@ static void mmu_spte_set(u64 *sptep, u64 new_spte)
__set_spte(sptep, new_spte);
}
/*
* Update the SPTE (excluding the PFN), but do not track changes in its
* accessed/dirty status.
*/
static u64 mmu_spte_update_no_track(u64 *sptep, u64 new_spte)
{
u64 old_spte = *sptep;
WARN_ON(!is_shadow_present_pte(new_spte));
if (!is_shadow_present_pte(old_spte)) {
mmu_spte_set(sptep, new_spte);
return old_spte;
}
if (!spte_has_volatile_bits(old_spte))
__update_clear_spte_fast(sptep, new_spte);
else
old_spte = __update_clear_spte_slow(sptep, new_spte);
WARN_ON(spte_to_pfn(old_spte) != spte_to_pfn(new_spte));
return old_spte;
}
/* Rules for using mmu_spte_update:
* Update the state bits, it means the mapped pfn is not changed.
*
@ -533,63 +614,49 @@ static void mmu_spte_set(u64 *sptep, u64 new_spte)
* will find a read-only spte, even though the writable spte
* might be cached on a CPU's TLB, the return value indicates this
* case.
*
* Returns true if the TLB needs to be flushed
*/
static bool mmu_spte_update(u64 *sptep, u64 new_spte)
{
u64 old_spte = *sptep;
bool ret = false;
bool flush = false;
u64 old_spte = mmu_spte_update_no_track(sptep, new_spte);
WARN_ON(!is_shadow_present_pte(new_spte));
if (!is_shadow_present_pte(old_spte)) {
mmu_spte_set(sptep, new_spte);
return ret;
}
if (!spte_has_volatile_bits(old_spte))
__update_clear_spte_fast(sptep, new_spte);
else
old_spte = __update_clear_spte_slow(sptep, new_spte);
if (!is_shadow_present_pte(old_spte))
return false;
/*
* For the spte updated out of mmu-lock is safe, since
* we always atomically update it, see the comments in
* spte_has_volatile_bits().
*/
if (spte_is_locklessly_modifiable(old_spte) &&
if (spte_can_locklessly_be_made_writable(old_spte) &&
!is_writable_pte(new_spte))
ret = true;
if (!shadow_accessed_mask) {
/*
* We don't set page dirty when dropping non-writable spte.
* So do it now if the new spte is becoming non-writable.
*/
if (ret)
kvm_set_pfn_dirty(spte_to_pfn(old_spte));
return ret;
}
flush = true;
/*
* Flush TLB when accessed/dirty bits are changed in the page tables,
* Flush TLB when accessed/dirty states are changed in the page tables,
* to guarantee consistency between TLB and page tables.
*/
if (spte_is_bit_changed(old_spte, new_spte,
shadow_accessed_mask | shadow_dirty_mask))
ret = true;
if (spte_is_bit_cleared(old_spte, new_spte, shadow_accessed_mask))
if (is_accessed_spte(old_spte) && !is_accessed_spte(new_spte)) {
flush = true;
kvm_set_pfn_accessed(spte_to_pfn(old_spte));
if (spte_is_bit_cleared(old_spte, new_spte, shadow_dirty_mask))
kvm_set_pfn_dirty(spte_to_pfn(old_spte));
}
return ret;
if (is_dirty_spte(old_spte) && !is_dirty_spte(new_spte)) {
flush = true;
kvm_set_pfn_dirty(spte_to_pfn(old_spte));
}
return flush;
}
/*
* Rules for using mmu_spte_clear_track_bits:
* It sets the sptep from present to nonpresent, and track the
* state bits, it is used to clear the last level sptep.
* Returns non-zero if the PTE was previously valid.
*/
static int mmu_spte_clear_track_bits(u64 *sptep)
{
@ -613,11 +680,12 @@ static int mmu_spte_clear_track_bits(u64 *sptep)
*/
WARN_ON(!kvm_is_reserved_pfn(pfn) && !page_count(pfn_to_page(pfn)));
if (!shadow_accessed_mask || old_spte & shadow_accessed_mask)
if (is_accessed_spte(old_spte))
kvm_set_pfn_accessed(pfn);
if (old_spte & (shadow_dirty_mask ? shadow_dirty_mask :
PT_WRITABLE_MASK))
if (is_dirty_spte(old_spte))
kvm_set_pfn_dirty(pfn);
return 1;
}
@ -636,6 +704,78 @@ static u64 mmu_spte_get_lockless(u64 *sptep)
return __get_spte_lockless(sptep);
}
static u64 mark_spte_for_access_track(u64 spte)
{
if (shadow_accessed_mask != 0)
return spte & ~shadow_accessed_mask;
if (shadow_acc_track_mask == 0 || is_access_track_spte(spte))
return spte;
/*
* Making an Access Tracking PTE will result in removal of write access
* from the PTE. So, verify that we will be able to restore the write
* access in the fast page fault path later on.
*/
WARN_ONCE((spte & PT_WRITABLE_MASK) &&
!spte_can_locklessly_be_made_writable(spte),
"kvm: Writable SPTE is not locklessly dirty-trackable\n");
WARN_ONCE(spte & (shadow_acc_track_saved_bits_mask <<
shadow_acc_track_saved_bits_shift),
"kvm: Access Tracking saved bit locations are not zero\n");
spte |= (spte & shadow_acc_track_saved_bits_mask) <<
shadow_acc_track_saved_bits_shift;
spte &= ~shadow_acc_track_mask;
spte |= shadow_acc_track_value;
return spte;
}
/* Restore an acc-track PTE back to a regular PTE */
static u64 restore_acc_track_spte(u64 spte)
{
u64 new_spte = spte;
u64 saved_bits = (spte >> shadow_acc_track_saved_bits_shift)
& shadow_acc_track_saved_bits_mask;
WARN_ON_ONCE(!is_access_track_spte(spte));
new_spte &= ~shadow_acc_track_mask;
new_spte &= ~(shadow_acc_track_saved_bits_mask <<
shadow_acc_track_saved_bits_shift);
new_spte |= saved_bits;
return new_spte;
}
/* Returns the Accessed status of the PTE and resets it at the same time. */
static bool mmu_spte_age(u64 *sptep)
{
u64 spte = mmu_spte_get_lockless(sptep);
if (!is_accessed_spte(spte))
return false;
if (shadow_accessed_mask) {
clear_bit((ffs(shadow_accessed_mask) - 1),
(unsigned long *)sptep);
} else {
/*
* Capture the dirty status of the page, so that it doesn't get
* lost when the SPTE is marked for access tracking.
*/
if (is_writable_pte(spte))
kvm_set_pfn_dirty(spte_to_pfn(spte));
spte = mark_spte_for_access_track(spte);
mmu_spte_update_no_track(sptep, spte);
}
return true;
}
static void walk_shadow_page_lockless_begin(struct kvm_vcpu *vcpu)
{
/*
@ -1212,7 +1352,7 @@ static bool spte_write_protect(u64 *sptep, bool pt_protect)
u64 spte = *sptep;
if (!is_writable_pte(spte) &&
!(pt_protect && spte_is_locklessly_modifiable(spte)))
!(pt_protect && spte_can_locklessly_be_made_writable(spte)))
return false;
rmap_printk("rmap_write_protect: spte %p %llx\n", sptep, *sptep);
@ -1420,7 +1560,7 @@ static int kvm_set_pte_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
restart:
for_each_rmap_spte(rmap_head, &iter, sptep) {
rmap_printk("kvm_set_pte_rmapp: spte %p %llx gfn %llx (%d)\n",
sptep, *sptep, gfn, level);
sptep, *sptep, gfn, level);
need_flush = 1;
@ -1433,7 +1573,8 @@ restart:
new_spte &= ~PT_WRITABLE_MASK;
new_spte &= ~SPTE_HOST_WRITEABLE;
new_spte &= ~shadow_accessed_mask;
new_spte = mark_spte_for_access_track(new_spte);
mmu_spte_clear_track_bits(sptep);
mmu_spte_set(sptep, new_spte);
@ -1595,15 +1736,8 @@ static int kvm_age_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
struct rmap_iterator uninitialized_var(iter);
int young = 0;
BUG_ON(!shadow_accessed_mask);
for_each_rmap_spte(rmap_head, &iter, sptep) {
if (*sptep & shadow_accessed_mask) {
young = 1;
clear_bit((ffs(shadow_accessed_mask) - 1),
(unsigned long *)sptep);
}
}
for_each_rmap_spte(rmap_head, &iter, sptep)
young |= mmu_spte_age(sptep);
trace_kvm_age_page(gfn, level, slot, young);
return young;
@ -1615,24 +1749,20 @@ static int kvm_test_age_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
{
u64 *sptep;
struct rmap_iterator iter;
int young = 0;
/*
* If there's no access bit in the secondary pte set by the
* hardware it's up to gup-fast/gup to set the access bit in
* the primary pte or in the page structure.
* If there's no access bit in the secondary pte set by the hardware and
* fast access tracking is also not enabled, it's up to gup-fast/gup to
* set the access bit in the primary pte or in the page structure.
*/
if (!shadow_accessed_mask)
if (!shadow_accessed_mask && !shadow_acc_track_mask)
goto out;
for_each_rmap_spte(rmap_head, &iter, sptep) {
if (*sptep & shadow_accessed_mask) {
young = 1;
break;
}
}
for_each_rmap_spte(rmap_head, &iter, sptep)
if (is_accessed_spte(*sptep))
return 1;
out:
return young;
return 0;
}
#define RMAP_RECYCLE_THRESHOLD 1000
@ -1660,7 +1790,7 @@ int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end)
* This has some overhead, but not as much as the cost of swapping
* out actively used pages or breaking up actively used hugepages.
*/
if (!shadow_accessed_mask)
if (!shadow_accessed_mask && !shadow_acc_track_mask)
return kvm_handle_hva_range(kvm, start, end, 0,
kvm_unmap_rmapp);
@ -1713,7 +1843,7 @@ static void kvm_mmu_free_page(struct kvm_mmu_page *sp)
static unsigned kvm_page_table_hashfn(gfn_t gfn)
{
return gfn & ((1 << KVM_MMU_HASH_SHIFT) - 1);
return hash_64(gfn, KVM_MMU_HASH_SHIFT);
}
static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu,
@ -1904,17 +2034,17 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
* since it has been deleted from active_mmu_pages but still can be found
* at hast list.
*
* for_each_gfn_valid_sp() has skipped that kind of pages.
* for_each_valid_sp() has skipped that kind of pages.
*/
#define for_each_gfn_valid_sp(_kvm, _sp, _gfn) \
#define for_each_valid_sp(_kvm, _sp, _gfn) \
hlist_for_each_entry(_sp, \
&(_kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(_gfn)], hash_link) \
if ((_sp)->gfn != (_gfn) || is_obsolete_sp((_kvm), (_sp)) \
|| (_sp)->role.invalid) {} else
if (is_obsolete_sp((_kvm), (_sp)) || (_sp)->role.invalid) { \
} else
#define for_each_gfn_indirect_valid_sp(_kvm, _sp, _gfn) \
for_each_gfn_valid_sp(_kvm, _sp, _gfn) \
if ((_sp)->role.direct) {} else
for_each_valid_sp(_kvm, _sp, _gfn) \
if ((_sp)->gfn != (_gfn) || (_sp)->role.direct) {} else
/* @sp->gfn should be write-protected at the call site */
static bool __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
@ -2116,6 +2246,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp;
bool need_sync = false;
bool flush = false;
int collisions = 0;
LIST_HEAD(invalid_list);
role = vcpu->arch.mmu.base_role;
@ -2130,7 +2261,12 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1;
role.quadrant = quadrant;
}
for_each_gfn_valid_sp(vcpu->kvm, sp, gfn) {
for_each_valid_sp(vcpu->kvm, sp, gfn) {
if (sp->gfn != gfn) {
collisions++;
continue;
}
if (!need_sync && sp->unsync)
need_sync = true;
@ -2153,7 +2289,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
__clear_sp_write_flooding_count(sp);
trace_kvm_mmu_get_page(sp, false);
return sp;
goto out;
}
++vcpu->kvm->stat.mmu_cache_miss;
@ -2183,6 +2319,9 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
trace_kvm_mmu_get_page(sp, true);
kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
out:
if (collisions > vcpu->kvm->stat.max_mmu_page_hash_collisions)
vcpu->kvm->stat.max_mmu_page_hash_collisions = collisions;
return sp;
}
@ -2583,6 +2722,9 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
spte |= shadow_dirty_mask;
}
if (speculative)
spte = mark_spte_for_access_track(spte);
set_pte:
if (mmu_spte_update(sptep, spte))
kvm_flush_remote_tlbs(vcpu->kvm);
@ -2636,7 +2778,7 @@ static bool mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, unsigned pte_access,
pgprintk("%s: setting spte %llx\n", __func__, *sptep);
pgprintk("instantiating %s PTE (%s) at %llx (%llx) addr %p\n",
is_large_pte(*sptep)? "2MB" : "4kB",
*sptep & PT_PRESENT_MASK ?"RW":"R", gfn,
*sptep & PT_WRITABLE_MASK ? "RW" : "R", gfn,
*sptep, sptep);
if (!was_rmapped && is_large_pte(*sptep))
++vcpu->kvm->stat.lpages;
@ -2869,32 +3011,42 @@ static bool page_fault_can_be_fast(u32 error_code)
if (unlikely(error_code & PFERR_RSVD_MASK))
return false;
/*
* #PF can be fast only if the shadow page table is present and it
* is caused by write-protect, that means we just need change the
* W bit of the spte which can be done out of mmu-lock.
*/
if (!(error_code & PFERR_PRESENT_MASK) ||
!(error_code & PFERR_WRITE_MASK))
/* See if the page fault is due to an NX violation */
if (unlikely(((error_code & (PFERR_FETCH_MASK | PFERR_PRESENT_MASK))
== (PFERR_FETCH_MASK | PFERR_PRESENT_MASK))))
return false;
return true;
/*
* #PF can be fast if:
* 1. The shadow page table entry is not present, which could mean that
* the fault is potentially caused by access tracking (if enabled).
* 2. The shadow page table entry is present and the fault
* is caused by write-protect, that means we just need change the W
* bit of the spte which can be done out of mmu-lock.
*
* However, if access tracking is disabled we know that a non-present
* page must be a genuine page fault where we have to create a new SPTE.
* So, if access tracking is disabled, we return true only for write
* accesses to a present page.
*/
return shadow_acc_track_mask != 0 ||
((error_code & (PFERR_WRITE_MASK | PFERR_PRESENT_MASK))
== (PFERR_WRITE_MASK | PFERR_PRESENT_MASK));
}
/*
* Returns true if the SPTE was fixed successfully. Otherwise,
* someone else modified the SPTE from its original value.
*/
static bool
fast_pf_fix_direct_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
u64 *sptep, u64 spte)
u64 *sptep, u64 old_spte, u64 new_spte)
{
gfn_t gfn;
WARN_ON(!sp->role.direct);
/*
* The gfn of direct spte is stable since it is calculated
* by sp->gfn.
*/
gfn = kvm_mmu_page_get_gfn(sp, sptep - sp->spt);
/*
* Theoretically we could also set dirty bit (and flush TLB) here in
* order to eliminate unnecessary PML logging. See comments in
@ -2907,12 +3059,33 @@ fast_pf_fix_direct_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
*
* Compare with set_spte where instead shadow_dirty_mask is set.
*/
if (cmpxchg64(sptep, spte, spte | PT_WRITABLE_MASK) == spte)
if (cmpxchg64(sptep, old_spte, new_spte) != old_spte)
return false;
if (is_writable_pte(new_spte) && !is_writable_pte(old_spte)) {
/*
* The gfn of direct spte is stable since it is
* calculated by sp->gfn.
*/
gfn = kvm_mmu_page_get_gfn(sp, sptep - sp->spt);
kvm_vcpu_mark_page_dirty(vcpu, gfn);
}
return true;
}
static bool is_access_allowed(u32 fault_err_code, u64 spte)
{
if (fault_err_code & PFERR_FETCH_MASK)
return is_executable_pte(spte);
if (fault_err_code & PFERR_WRITE_MASK)
return is_writable_pte(spte);
/* Fault was on Read access */
return spte & PT_PRESENT_MASK;
}
/*
* Return value:
* - true: let the vcpu to access on the same address again.
@ -2923,8 +3096,9 @@ static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, int level,
{
struct kvm_shadow_walk_iterator iterator;
struct kvm_mmu_page *sp;
bool ret = false;
bool fault_handled = false;
u64 spte = 0ull;
uint retry_count = 0;
if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
return false;
@ -2933,66 +3107,93 @@ static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, int level,
return false;
walk_shadow_page_lockless_begin(vcpu);
for_each_shadow_entry_lockless(vcpu, gva, iterator, spte)
if (!is_shadow_present_pte(spte) || iterator.level < level)
do {
u64 new_spte;
for_each_shadow_entry_lockless(vcpu, gva, iterator, spte)
if (!is_shadow_present_pte(spte) ||
iterator.level < level)
break;
sp = page_header(__pa(iterator.sptep));
if (!is_last_spte(spte, sp->role.level))
break;
/*
* If the mapping has been changed, let the vcpu fault on the
* same address again.
*/
if (!is_shadow_present_pte(spte)) {
ret = true;
goto exit;
}
/*
* Check whether the memory access that caused the fault would
* still cause it if it were to be performed right now. If not,
* then this is a spurious fault caused by TLB lazily flushed,
* or some other CPU has already fixed the PTE after the
* current CPU took the fault.
*
* Need not check the access of upper level table entries since
* they are always ACC_ALL.
*/
if (is_access_allowed(error_code, spte)) {
fault_handled = true;
break;
}
sp = page_header(__pa(iterator.sptep));
if (!is_last_spte(spte, sp->role.level))
goto exit;
new_spte = spte;
/*
* Check if it is a spurious fault caused by TLB lazily flushed.
*
* Need not check the access of upper level table entries since
* they are always ACC_ALL.
*/
if (is_writable_pte(spte)) {
ret = true;
goto exit;
}
if (is_access_track_spte(spte))
new_spte = restore_acc_track_spte(new_spte);
/*
* Currently, to simplify the code, only the spte write-protected
* by dirty-log can be fast fixed.
*/
if (!spte_is_locklessly_modifiable(spte))
goto exit;
/*
* Currently, to simplify the code, write-protection can
* be removed in the fast path only if the SPTE was
* write-protected for dirty-logging or access tracking.
*/
if ((error_code & PFERR_WRITE_MASK) &&
spte_can_locklessly_be_made_writable(spte))
{
new_spte |= PT_WRITABLE_MASK;
/*
* Do not fix write-permission on the large spte since we only dirty
* the first page into the dirty-bitmap in fast_pf_fix_direct_spte()
* that means other pages are missed if its slot is dirty-logged.
*
* Instead, we let the slow page fault path create a normal spte to
* fix the access.
*
* See the comments in kvm_arch_commit_memory_region().
*/
if (sp->role.level > PT_PAGE_TABLE_LEVEL)
goto exit;
/*
* Do not fix write-permission on the large spte. Since
* we only dirty the first page into the dirty-bitmap in
* fast_pf_fix_direct_spte(), other pages are missed
* if its slot has dirty logging enabled.
*
* Instead, we let the slow page fault path create a
* normal spte to fix the access.
*
* See the comments in kvm_arch_commit_memory_region().
*/
if (sp->role.level > PT_PAGE_TABLE_LEVEL)
break;
}
/* Verify that the fault can be handled in the fast path */
if (new_spte == spte ||
!is_access_allowed(error_code, new_spte))
break;
/*
* Currently, fast page fault only works for direct mapping
* since the gfn is not stable for indirect shadow page. See
* Documentation/virtual/kvm/locking.txt to get more detail.
*/
fault_handled = fast_pf_fix_direct_spte(vcpu, sp,
iterator.sptep, spte,
new_spte);
if (fault_handled)
break;
if (++retry_count > 4) {
printk_once(KERN_WARNING
"kvm: Fast #PF retrying more than 4 times.\n");
break;
}
} while (true);
/*
* Currently, fast page fault only works for direct mapping since
* the gfn is not stable for indirect shadow page.
* See Documentation/virtual/kvm/locking.txt to get more detail.
*/
ret = fast_pf_fix_direct_spte(vcpu, sp, iterator.sptep, spte);
exit:
trace_fast_page_fault(vcpu, gva, error_code, iterator.sptep,
spte, ret);
spte, fault_handled);
walk_shadow_page_lockless_end(vcpu);
return ret;
return fault_handled;
}
static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn,
@ -5063,6 +5264,8 @@ static void mmu_destroy_caches(void)
int kvm_mmu_module_init(void)
{
kvm_mmu_clear_all_pte_masks();
pte_list_desc_cache = kmem_cache_create("pte_list_desc",
sizeof(struct pte_list_desc),
0, 0, NULL);

57
arch/x86/kvm/svm.c
View File

@ -971,8 +971,8 @@ static void svm_disable_lbrv(struct vcpu_svm *svm)
* a particular vCPU.
*/
#define SVM_VM_DATA_HASH_BITS 8
DECLARE_HASHTABLE(svm_vm_data_hash, SVM_VM_DATA_HASH_BITS);
static spinlock_t svm_vm_data_hash_lock;
static DEFINE_HASHTABLE(svm_vm_data_hash, SVM_VM_DATA_HASH_BITS);
static DEFINE_SPINLOCK(svm_vm_data_hash_lock);
/* Note:
* This function is called from IOMMU driver to notify
@ -1077,8 +1077,6 @@ static __init int svm_hardware_setup(void)
} else {
pr_info("AVIC enabled\n");
hash_init(svm_vm_data_hash);
spin_lock_init(&svm_vm_data_hash_lock);
amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
}
}
@ -1159,7 +1157,6 @@ static void init_vmcb(struct vcpu_svm *svm)
struct vmcb_control_area *control = &svm->vmcb->control;
struct vmcb_save_area *save = &svm->vmcb->save;
svm->vcpu.fpu_active = 1;
svm->vcpu.arch.hflags = 0;
set_cr_intercept(svm, INTERCEPT_CR0_READ);
@ -1901,15 +1898,12 @@ static void update_cr0_intercept(struct vcpu_svm *svm)
ulong gcr0 = svm->vcpu.arch.cr0;
u64 *hcr0 = &svm->vmcb->save.cr0;
if (!svm->vcpu.fpu_active)
*hcr0 |= SVM_CR0_SELECTIVE_MASK;
else
*hcr0 = (*hcr0 & ~SVM_CR0_SELECTIVE_MASK)
| (gcr0 & SVM_CR0_SELECTIVE_MASK);
*hcr0 = (*hcr0 & ~SVM_CR0_SELECTIVE_MASK)
| (gcr0 & SVM_CR0_SELECTIVE_MASK);
mark_dirty(svm->vmcb, VMCB_CR);
if (gcr0 == *hcr0 && svm->vcpu.fpu_active) {
if (gcr0 == *hcr0) {
clr_cr_intercept(svm, INTERCEPT_CR0_READ);
clr_cr_intercept(svm, INTERCEPT_CR0_WRITE);
} else {
@ -1940,8 +1934,6 @@ static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
if (!npt_enabled)
cr0 |= X86_CR0_PG | X86_CR0_WP;
if (!vcpu->fpu_active)
cr0 |= X86_CR0_TS;
/*
* re-enable caching here because the QEMU bios
* does not do it - this results in some delay at
@ -2160,22 +2152,6 @@ static int ac_interception(struct vcpu_svm *svm)
return 1;
}
static void svm_fpu_activate(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
clr_exception_intercept(svm, NM_VECTOR);
svm->vcpu.fpu_active = 1;
update_cr0_intercept(svm);
}
static int nm_interception(struct vcpu_svm *svm)
{
svm_fpu_activate(&svm->vcpu);
return 1;
}
static bool is_erratum_383(void)
{
int err, i;
@ -2573,9 +2549,6 @@ static int nested_svm_exit_special(struct vcpu_svm *svm)
if (!npt_enabled && svm->apf_reason == 0)
return NESTED_EXIT_HOST;
break;
case SVM_EXIT_EXCP_BASE + NM_VECTOR:
nm_interception(svm);
break;
default:
break;
}
@ -4020,7 +3993,6 @@ static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
[SVM_EXIT_EXCP_BASE + BP_VECTOR] = bp_interception,
[SVM_EXIT_EXCP_BASE + UD_VECTOR] = ud_interception,
[SVM_EXIT_EXCP_BASE + PF_VECTOR] = pf_interception,
[SVM_EXIT_EXCP_BASE + NM_VECTOR] = nm_interception,
[SVM_EXIT_EXCP_BASE + MC_VECTOR] = mc_interception,
[SVM_EXIT_EXCP_BASE + AC_VECTOR] = ac_interception,
[SVM_EXIT_INTR] = intr_interception,
@ -4182,6 +4154,8 @@ static int handle_exit(struct kvm_vcpu *vcpu)
trace_kvm_exit(exit_code, vcpu, KVM_ISA_SVM);
vcpu->arch.gpa_available = (exit_code == SVM_EXIT_NPF);
if (!is_cr_intercept(svm, INTERCEPT_CR0_WRITE))
vcpu->arch.cr0 = svm->vmcb->save.cr0;
if (npt_enabled)
@ -4357,11 +4331,6 @@ static void svm_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
return;
}
static void svm_sync_pir_to_irr(struct kvm_vcpu *vcpu)
{
return;
}
static void svm_deliver_avic_intr(struct kvm_vcpu *vcpu, int vec)
{
kvm_lapic_set_irr(vec, vcpu->arch.apic);
@ -5077,14 +5046,6 @@ static bool svm_has_wbinvd_exit(void)
return true;
}
static void svm_fpu_deactivate(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
set_exception_intercept(svm, NM_VECTOR);
update_cr0_intercept(svm);
}
#define PRE_EX(exit) { .exit_code = (exit), \
.stage = X86_ICPT_PRE_EXCEPT, }
#define POST_EX(exit) { .exit_code = (exit), \
@ -5345,9 +5306,6 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.get_pkru = svm_get_pkru,
.fpu_activate = svm_fpu_activate,
.fpu_deactivate = svm_fpu_deactivate,
.tlb_flush = svm_flush_tlb,
.run = svm_vcpu_run,
@ -5371,7 +5329,6 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.get_enable_apicv = svm_get_enable_apicv,
.refresh_apicv_exec_ctrl = svm_refresh_apicv_exec_ctrl,
.load_eoi_exitmap = svm_load_eoi_exitmap,
.sync_pir_to_irr = svm_sync_pir_to_irr,
.hwapic_irr_update = svm_hwapic_irr_update,
.hwapic_isr_update = svm_hwapic_isr_update,
.apicv_post_state_restore = avic_post_state_restore,

1025
arch/x86/kvm/vmx.c
View File

File diff suppressed because it is too large Load Diff

274
arch/x86/kvm/x86.c
View File

@ -180,6 +180,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
{ "irq_injections", VCPU_STAT(irq_injections) },
{ "nmi_injections", VCPU_STAT(nmi_injections) },
{ "req_event", VCPU_STAT(req_event) },
{ "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
{ "mmu_pte_write", VM_STAT(mmu_pte_write) },
{ "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
@ -190,6 +191,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "mmu_unsync", VM_STAT(mmu_unsync) },
{ "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
{ "largepages", VM_STAT(lpages) },
{ "max_mmu_page_hash_collisions",
VM_STAT(max_mmu_page_hash_collisions) },
{ NULL }
};
@ -1139,6 +1142,7 @@ struct pvclock_gtod_data {
u64 boot_ns;
u64 nsec_base;
u64 wall_time_sec;
};
static struct pvclock_gtod_data pvclock_gtod_data;
@ -1162,6 +1166,8 @@ static void update_pvclock_gtod(struct timekeeper *tk)
vdata->boot_ns = boot_ns;
vdata->nsec_base = tk->tkr_mono.xtime_nsec;
vdata->wall_time_sec = tk->xtime_sec;
write_seqcount_end(&vdata->seq);
}
#endif
@ -1623,6 +1629,28 @@ static int do_monotonic_boot(s64 *t, u64 *cycle_now)
return mode;
}
static int do_realtime(struct timespec *ts, u64 *cycle_now)
{
struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
unsigned long seq;
int mode;
u64 ns;
do {
seq = read_seqcount_begin(&gtod->seq);
mode = gtod->clock.vclock_mode;
ts->tv_sec = gtod->wall_time_sec;
ns = gtod->nsec_base;
ns += vgettsc(cycle_now);
ns >>= gtod->clock.shift;
} while (unlikely(read_seqcount_retry(&gtod->seq, seq)));
ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
ts->tv_nsec = ns;
return mode;
}
/* returns true if host is using tsc clocksource */
static bool kvm_get_time_and_clockread(s64 *kernel_ns, u64 *cycle_now)
{
@ -1632,6 +1660,17 @@ static bool kvm_get_time_and_clockread(s64 *kernel_ns, u64 *cycle_now)
return do_monotonic_boot(kernel_ns, cycle_now) == VCLOCK_TSC;
}
/* returns true if host is using tsc clocksource */
static bool kvm_get_walltime_and_clockread(struct timespec *ts,
u64 *cycle_now)
{
/* checked again under seqlock below */
if (pvclock_gtod_data.clock.vclock_mode != VCLOCK_TSC)
return false;
return do_realtime(ts, cycle_now) == VCLOCK_TSC;
}
#endif
/*
@ -1772,7 +1811,7 @@ static void kvm_setup_pvclock_page(struct kvm_vcpu *v)
struct kvm_vcpu_arch *vcpu = &v->arch;
struct pvclock_vcpu_time_info guest_hv_clock;
if (unlikely(kvm_read_guest_cached(v->kvm, &vcpu->pv_time,
if (unlikely(kvm_vcpu_read_guest_cached(v, &vcpu->pv_time,
&guest_hv_clock, sizeof(guest_hv_clock))))
return;
@ -1793,9 +1832,9 @@ static void kvm_setup_pvclock_page(struct kvm_vcpu *v)
BUILD_BUG_ON(offsetof(struct pvclock_vcpu_time_info, version) != 0);
vcpu->hv_clock.version = guest_hv_clock.version + 1;
kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
&vcpu->hv_clock,
sizeof(vcpu->hv_clock.version));
kvm_vcpu_write_guest_cached(v, &vcpu->pv_time,
&vcpu->hv_clock,
sizeof(vcpu->hv_clock.version));
smp_wmb();
@ -1809,16 +1848,16 @@ static void kvm_setup_pvclock_page(struct kvm_vcpu *v)
trace_kvm_pvclock_update(v->vcpu_id, &vcpu->hv_clock);
kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
&vcpu->hv_clock,
sizeof(vcpu->hv_clock));
kvm_vcpu_write_guest_cached(v, &vcpu->pv_time,
&vcpu->hv_clock,
sizeof(vcpu->hv_clock));
smp_wmb();
vcpu->hv_clock.version++;
kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
&vcpu->hv_clock,
sizeof(vcpu->hv_clock.version));
kvm_vcpu_write_guest_cached(v, &vcpu->pv_time,
&vcpu->hv_clock,
sizeof(vcpu->hv_clock.version));
}
static int kvm_guest_time_update(struct kvm_vcpu *v)
@ -2051,7 +2090,7 @@ static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
return 0;
}
if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa,
if (kvm_vcpu_gfn_to_hva_cache_init(vcpu, &vcpu->arch.apf.data, gpa,
sizeof(u32)))
return 1;
@ -2070,7 +2109,7 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
return;
if (unlikely(kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
if (unlikely(kvm_vcpu_read_guest_cached(vcpu, &vcpu->arch.st.stime,
&vcpu->arch.st.steal, sizeof(struct kvm_steal_time))))
return;
@ -2081,7 +2120,7 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
vcpu->arch.st.steal.version += 1;
kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
kvm_vcpu_write_guest_cached(vcpu, &vcpu->arch.st.stime,
&vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
smp_wmb();
@ -2090,14 +2129,14 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
vcpu->arch.st.last_steal;
vcpu->arch.st.last_steal = current->sched_info.run_delay;
kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
kvm_vcpu_write_guest_cached(vcpu, &vcpu->arch.st.stime,
&vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
smp_wmb();
vcpu->arch.st.steal.version += 1;
kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
kvm_vcpu_write_guest_cached(vcpu, &vcpu->arch.st.stime,
&vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
}
@ -2202,7 +2241,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if (!(data & 1))
break;
if (kvm_gfn_to_hva_cache_init(vcpu->kvm,
if (kvm_vcpu_gfn_to_hva_cache_init(vcpu,
&vcpu->arch.pv_time, data & ~1ULL,
sizeof(struct pvclock_vcpu_time_info)))
vcpu->arch.pv_time_enabled = false;
@ -2223,7 +2262,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if (data & KVM_STEAL_RESERVED_MASK)
return 1;
if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime,
if (kvm_vcpu_gfn_to_hva_cache_init(vcpu, &vcpu->arch.st.stime,
data & KVM_STEAL_VALID_BITS,
sizeof(struct kvm_steal_time)))
return 1;
@ -2633,6 +2672,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_DISABLE_QUIRKS:
case KVM_CAP_SET_BOOT_CPU_ID:
case KVM_CAP_SPLIT_IRQCHIP:
case KVM_CAP_IMMEDIATE_EXIT:
#ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
case KVM_CAP_ASSIGN_DEV_IRQ:
case KVM_CAP_PCI_2_3:
@ -2836,7 +2876,7 @@ static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu)
vcpu->arch.st.steal.preempted = 1;
kvm_write_guest_offset_cached(vcpu->kvm, &vcpu->arch.st.stime,
kvm_vcpu_write_guest_offset_cached(vcpu, &vcpu->arch.st.stime,
&vcpu->arch.st.steal.preempted,
offsetof(struct kvm_steal_time, preempted),
sizeof(vcpu->arch.st.steal.preempted));
@ -2870,7 +2910,7 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
struct kvm_lapic_state *s)
{
if (vcpu->arch.apicv_active)
if (kvm_x86_ops->sync_pir_to_irr && vcpu->arch.apicv_active)
kvm_x86_ops->sync_pir_to_irr(vcpu);
return kvm_apic_get_state(vcpu, s);
@ -3897,7 +3937,7 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
goto split_irqchip_unlock;
/* Pairs with irqchip_in_kernel. */
smp_wmb();
kvm->arch.irqchip_split = true;
kvm->arch.irqchip_mode = KVM_IRQCHIP_SPLIT;
kvm->arch.nr_reserved_ioapic_pins = cap->args[0];
r = 0;
split_irqchip_unlock:
@ -3960,40 +4000,41 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
break;
case KVM_CREATE_IRQCHIP: {
struct kvm_pic *vpic;
mutex_lock(&kvm->lock);
r = -EEXIST;
if (kvm->arch.vpic)
if (irqchip_in_kernel(kvm))
goto create_irqchip_unlock;
r = -EINVAL;
if (kvm->created_vcpus)
goto create_irqchip_unlock;
r = -ENOMEM;
vpic = kvm_create_pic(kvm);
if (vpic) {
r = kvm_ioapic_init(kvm);
if (r) {
mutex_lock(&kvm->slots_lock);
kvm_destroy_pic(vpic);
mutex_unlock(&kvm->slots_lock);
goto create_irqchip_unlock;
}
} else
r = kvm_pic_init(kvm);
if (r)
goto create_irqchip_unlock;
r = kvm_ioapic_init(kvm);
if (r) {
mutex_lock(&kvm->slots_lock);
kvm_pic_destroy(kvm);
mutex_unlock(&kvm->slots_lock);
goto create_irqchip_unlock;
}
r = kvm_setup_default_irq_routing(kvm);
if (r) {
mutex_lock(&kvm->slots_lock);
mutex_lock(&kvm->irq_lock);
kvm_ioapic_destroy(kvm);
kvm_destroy_pic(vpic);
kvm_pic_destroy(kvm);
mutex_unlock(&kvm->irq_lock);
mutex_unlock(&kvm->slots_lock);
goto create_irqchip_unlock;
}
/* Write kvm->irq_routing before kvm->arch.vpic. */
/* Write kvm->irq_routing before enabling irqchip_in_kernel. */
smp_wmb();
kvm->arch.vpic = vpic;
kvm->arch.irqchip_mode = KVM_IRQCHIP_KERNEL;
create_irqchip_unlock:
mutex_unlock(&kvm->lock);
break;
@ -4029,7 +4070,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
}
r = -ENXIO;
if (!irqchip_in_kernel(kvm) || irqchip_split(kvm))
if (!irqchip_kernel(kvm))
goto get_irqchip_out;
r = kvm_vm_ioctl_get_irqchip(kvm, chip);
if (r)
@ -4053,7 +4094,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
}
r = -ENXIO;
if (!irqchip_in_kernel(kvm) || irqchip_split(kvm))
if (!irqchip_kernel(kvm))
goto set_irqchip_out;
r = kvm_vm_ioctl_set_irqchip(kvm, chip);
if (r)
@ -4462,6 +4503,21 @@ out:
}
EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);
static int vcpu_is_mmio_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
gpa_t gpa, bool write)
{
/* For APIC access vmexit */
if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
return 1;
if (vcpu_match_mmio_gpa(vcpu, gpa)) {
trace_vcpu_match_mmio(gva, gpa, write, true);
return 1;
}
return 0;
}
static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
gpa_t *gpa, struct x86_exception *exception,
bool write)
@ -4488,16 +4544,7 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
if (*gpa == UNMAPPED_GVA)
return -1;
/* For APIC access vmexit */
if ((*gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
return 1;
if (vcpu_match_mmio_gpa(vcpu, *gpa)) {
trace_vcpu_match_mmio(gva, *gpa, write, true);
return 1;
}
return 0;
return vcpu_is_mmio_gpa(vcpu, gva, *gpa, write);
}
int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
@ -4594,6 +4641,22 @@ static int emulator_read_write_onepage(unsigned long addr, void *val,
int handled, ret;
bool write = ops->write;
struct kvm_mmio_fragment *frag;
struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
/*
* If the exit was due to a NPF we may already have a GPA.
* If the GPA is present, use it to avoid the GVA to GPA table walk.
* Note, this cannot be used on string operations since string
* operation using rep will only have the initial GPA from the NPF
* occurred.
*/
if (vcpu->arch.gpa_available &&
emulator_can_use_gpa(ctxt) &&
vcpu_is_mmio_gpa(vcpu, addr, exception->address, write) &&
(addr & ~PAGE_MASK) == (exception->address & ~PAGE_MASK)) {
gpa = exception->address;
goto mmio;
}
ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write);
@ -5610,6 +5673,9 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu,
}
restart:
/* Save the faulting GPA (cr2) in the address field */
ctxt->exception.address = cr2;
r = x86_emulate_insn(ctxt);
if (r == EMULATION_INTERCEPTED)
@ -5924,9 +5990,6 @@ static void kvm_set_mmio_spte_mask(void)
/* Mask the reserved physical address bits. */
mask = rsvd_bits(maxphyaddr, 51);
/* Bit 62 is always reserved for 32bit host. */
mask |= 0x3ull << 62;
/* Set the present bit. */
mask |= 1ull;
@ -6025,7 +6088,7 @@ int kvm_arch_init(void *opaque)
kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
PT_DIRTY_MASK, PT64_NX_MASK, 0,
PT_PRESENT_MASK);
PT_PRESENT_MASK, 0);
kvm_timer_init();
perf_register_guest_info_callbacks(&kvm_guest_cbs);
@ -6087,6 +6150,35 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_emulate_halt);
#ifdef CONFIG_X86_64
static int kvm_pv_clock_pairing(struct kvm_vcpu *vcpu, gpa_t paddr,
unsigned long clock_type)
{
struct kvm_clock_pairing clock_pairing;
struct timespec ts;
u64 cycle;
int ret;
if (clock_type != KVM_CLOCK_PAIRING_WALLCLOCK)
return -KVM_EOPNOTSUPP;
if (kvm_get_walltime_and_clockread(&ts, &cycle) == false)
return -KVM_EOPNOTSUPP;
clock_pairing.sec = ts.tv_sec;
clock_pairing.nsec = ts.tv_nsec;
clock_pairing.tsc = kvm_read_l1_tsc(vcpu, cycle);
clock_pairing.flags = 0;
ret = 0;
if (kvm_write_guest(vcpu->kvm, paddr, &clock_pairing,
sizeof(struct kvm_clock_pairing)))
ret = -KVM_EFAULT;
return ret;
}
#endif
/*
* kvm_pv_kick_cpu_op: Kick a vcpu.
*
@ -6151,6 +6243,11 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
kvm_pv_kick_cpu_op(vcpu->kvm, a0, a1);
ret = 0;
break;
#ifdef CONFIG_X86_64
case KVM_HC_CLOCK_PAIRING:
ret = kvm_pv_clock_pairing(vcpu, a0, a1);
break;
#endif
default:
ret = -KVM_ENOSYS;
break;
@ -6564,7 +6661,7 @@ static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
if (irqchip_split(vcpu->kvm))
kvm_scan_ioapic_routes(vcpu, vcpu->arch.ioapic_handled_vectors);
else {
if (vcpu->arch.apicv_active)
if (kvm_x86_ops->sync_pir_to_irr && vcpu->arch.apicv_active)
kvm_x86_ops->sync_pir_to_irr(vcpu);
kvm_ioapic_scan_entry(vcpu, vcpu->arch.ioapic_handled_vectors);
}
@ -6655,10 +6752,6 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
r = 0;
goto out;
}
if (kvm_check_request(KVM_REQ_DEACTIVATE_FPU, vcpu)) {
vcpu->fpu_active = 0;
kvm_x86_ops->fpu_deactivate(vcpu);
}
if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) {
/* Page is swapped out. Do synthetic halt */
vcpu->arch.apf.halted = true;
@ -6718,21 +6811,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
kvm_hv_process_stimers(vcpu);
}
/*
* KVM_REQ_EVENT is not set when posted interrupts are set by
* VT-d hardware, so we have to update RVI unconditionally.
*/
if (kvm_lapic_enabled(vcpu)) {
/*
* Update architecture specific hints for APIC
* virtual interrupt delivery.
*/
if (vcpu->arch.apicv_active)
kvm_x86_ops->hwapic_irr_update(vcpu,
kvm_lapic_find_highest_irr(vcpu));
}
if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
++vcpu->stat.req_event;
kvm_apic_accept_events(vcpu);
if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
r = 1;
@ -6773,22 +6853,40 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
preempt_disable();
kvm_x86_ops->prepare_guest_switch(vcpu);
if (vcpu->fpu_active)
kvm_load_guest_fpu(vcpu);
kvm_load_guest_fpu(vcpu);
/*
* Disable IRQs before setting IN_GUEST_MODE. Posted interrupt
* IPI are then delayed after guest entry, which ensures that they
* result in virtual interrupt delivery.
*/
local_irq_disable();
vcpu->mode = IN_GUEST_MODE;
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
/*
* We should set ->mode before check ->requests,
* Please see the comment in kvm_make_all_cpus_request.
* This also orders the write to mode from any reads
* to the page tables done while the VCPU is running.
* Please see the comment in kvm_flush_remote_tlbs.
* 1) We should set ->mode before checking ->requests. Please see
* the comment in kvm_make_all_cpus_request.
*
* 2) For APICv, we should set ->mode before checking PIR.ON. This
* pairs with the memory barrier implicit in pi_test_and_set_on
* (see vmx_deliver_posted_interrupt).
*
* 3) This also orders the write to mode from any reads to the page
* tables done while the VCPU is running. Please see the comment
* in kvm_flush_remote_tlbs.
*/
smp_mb__after_srcu_read_unlock();
local_irq_disable();
/*
* This handles the case where a posted interrupt was
* notified with kvm_vcpu_kick.
*/
if (kvm_lapic_enabled(vcpu)) {
if (kvm_x86_ops->sync_pir_to_irr && vcpu->arch.apicv_active)
kvm_x86_ops->sync_pir_to_irr(vcpu);
}
if (vcpu->mode == EXITING_GUEST_MODE || vcpu->requests
|| need_resched() || signal_pending(current)) {
@ -6927,6 +7025,9 @@ static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu)
static inline bool kvm_vcpu_running(struct kvm_vcpu *vcpu)
{
if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events)
kvm_x86_ops->check_nested_events(vcpu, false);
return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
!vcpu->arch.apf.halted);
}
@ -7098,7 +7199,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
} else
WARN_ON(vcpu->arch.pio.count || vcpu->mmio_needed);
r = vcpu_run(vcpu);
if (kvm_run->immediate_exit)
r = -EINTR;
else
r = vcpu_run(vcpu);
out:
post_kvm_run_save(vcpu);
@ -8293,9 +8397,6 @@ static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu)
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events)
kvm_x86_ops->check_nested_events(vcpu, false);
return kvm_vcpu_running(vcpu) || kvm_vcpu_has_events(vcpu);
}
@ -8432,9 +8533,8 @@ static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
static int apf_put_user(struct kvm_vcpu *vcpu, u32 val)
{
return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val,
sizeof(val));
return kvm_vcpu_write_guest_cached(vcpu, &vcpu->arch.apf.data, &val,
sizeof(val));
}
void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,

12
drivers/ptp/Kconfig
View File

@ -90,4 +90,16 @@ config PTP_1588_CLOCK_PCH
To compile this driver as a module, choose M here: the module
will be called ptp_pch.
config PTP_1588_CLOCK_KVM
tristate "KVM virtual PTP clock"
depends on PTP_1588_CLOCK
depends on KVM_GUEST && X86
default y
help
This driver adds support for using kvm infrastructure as a PTP
clock. This clock is only useful if you are using KVM guests.
To compile this driver as a module, choose M here: the module
will be called ptp_kvm.
endmenu

1
drivers/ptp/Makefile
View File

@ -6,3 +6,4 @@ ptp-y := ptp_clock.o ptp_chardev.o ptp_sysfs.o
obj-$(CONFIG_PTP_1588_CLOCK) += ptp.o
obj-$(CONFIG_PTP_1588_CLOCK_IXP46X) += ptp_ixp46x.o
obj-$(CONFIG_PTP_1588_CLOCK_PCH) += ptp_pch.o
obj-$(CONFIG_PTP_1588_CLOCK_KVM) += ptp_kvm.o

207
drivers/ptp/ptp_kvm.c Normal file
View File

@ -0,0 +1,207 @@
/*
* Virtual PTP 1588 clock for use with KVM guests
*
* Copyright (C) 2017 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <uapi/linux/kvm_para.h>
#include <asm/kvm_para.h>
#include <asm/pvclock.h>
#include <asm/kvmclock.h>
#include <uapi/asm/kvm_para.h>
#include <linux/ptp_clock_kernel.h>
struct kvm_ptp_clock {
struct ptp_clock *ptp_clock;
struct ptp_clock_info caps;
};
DEFINE_SPINLOCK(kvm_ptp_lock);
static struct pvclock_vsyscall_time_info *hv_clock;
static struct kvm_clock_pairing clock_pair;
static phys_addr_t clock_pair_gpa;
static int ptp_kvm_get_time_fn(ktime_t *device_time,
struct system_counterval_t *system_counter,
void *ctx)
{
unsigned long ret;
struct timespec64 tspec;
unsigned version;
int cpu;
struct pvclock_vcpu_time_info *src;
spin_lock(&kvm_ptp_lock);
preempt_disable_notrace();
cpu = smp_processor_id();
src = &hv_clock[cpu].pvti;
do {
/*
* We are using a TSC value read in the hosts
* kvm_hc_clock_pairing handling.
* So any changes to tsc_to_system_mul
* and tsc_shift or any other pvclock
* data invalidate that measurement.
*/
version = pvclock_read_begin(src);
ret = kvm_hypercall2(KVM_HC_CLOCK_PAIRING,
clock_pair_gpa,
KVM_CLOCK_PAIRING_WALLCLOCK);
if (ret != 0) {
pr_err_ratelimited("clock pairing hypercall ret %lu\n", ret);
spin_unlock(&kvm_ptp_lock);
preempt_enable_notrace();
return -EOPNOTSUPP;
}
tspec.tv_sec = clock_pair.sec;
tspec.tv_nsec = clock_pair.nsec;
ret = __pvclock_read_cycles(src, clock_pair.tsc);
} while (pvclock_read_retry(src, version));
preempt_enable_notrace();
system_counter->cycles = ret;
system_counter->cs = &kvm_clock;
*device_time = timespec64_to_ktime(tspec);
spin_unlock(&kvm_ptp_lock);
return 0;
}
static int ptp_kvm_getcrosststamp(struct ptp_clock_info *ptp,
struct system_device_crosststamp *xtstamp)
{
return get_device_system_crosststamp(ptp_kvm_get_time_fn, NULL,
NULL, xtstamp);
}
/*
* PTP clock operations
*/
static int ptp_kvm_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
{
return -EOPNOTSUPP;
}
static int ptp_kvm_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
return -EOPNOTSUPP;
}
static int ptp_kvm_settime(struct ptp_clock_info *ptp,
const struct timespec64 *ts)
{
return -EOPNOTSUPP;
}
static int ptp_kvm_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
{
unsigned long ret;
struct timespec64 tspec;
spin_lock(&kvm_ptp_lock);
ret = kvm_hypercall2(KVM_HC_CLOCK_PAIRING,
clock_pair_gpa,
KVM_CLOCK_PAIRING_WALLCLOCK);
if (ret != 0) {
pr_err_ratelimited("clock offset hypercall ret %lu\n", ret);
spin_unlock(&kvm_ptp_lock);
return -EOPNOTSUPP;
}
tspec.tv_sec = clock_pair.sec;
tspec.tv_nsec = clock_pair.nsec;
spin_unlock(&kvm_ptp_lock);
memcpy(ts, &tspec, sizeof(struct timespec64));
return 0;
}
static int ptp_kvm_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq, int on)
{
return -EOPNOTSUPP;
}
static struct ptp_clock_info ptp_kvm_caps = {
.owner = THIS_MODULE,
.name = "KVM virtual PTP",
.max_adj = 0,
.n_ext_ts = 0,
.n_pins = 0,
.pps = 0,
.adjfreq = ptp_kvm_adjfreq,
.adjtime = ptp_kvm_adjtime,
.gettime64 = ptp_kvm_gettime,
.settime64 = ptp_kvm_settime,
.enable = ptp_kvm_enable,
.getcrosststamp = ptp_kvm_getcrosststamp,
};
/* module operations */
static struct kvm_ptp_clock kvm_ptp_clock;
static void __exit ptp_kvm_exit(void)
{
ptp_clock_unregister(kvm_ptp_clock.ptp_clock);
}
static int __init ptp_kvm_init(void)
{
long ret;
clock_pair_gpa = slow_virt_to_phys(&clock_pair);
hv_clock = pvclock_pvti_cpu0_va();
if (!hv_clock)
return -ENODEV;
ret = kvm_hypercall2(KVM_HC_CLOCK_PAIRING, clock_pair_gpa,
KVM_CLOCK_PAIRING_WALLCLOCK);
if (ret == -KVM_ENOSYS || ret == -KVM_EOPNOTSUPP)
return -ENODEV;
kvm_ptp_clock.caps = ptp_kvm_caps;
kvm_ptp_clock.ptp_clock = ptp_clock_register(&kvm_ptp_clock.caps, NULL);
if (IS_ERR(kvm_ptp_clock.ptp_clock))
return PTR_ERR(kvm_ptp_clock.ptp_clock);
return 0;
}
module_init(ptp_kvm_init);
module_exit(ptp_kvm_exit);
MODULE_AUTHOR("Marcelo Tosatti <mtosatti@redhat.com>");
MODULE_DESCRIPTION("PTP clock using KVMCLOCK");
MODULE_LICENSE("GPL");

39
include/kvm/arm_arch_timer.h
View File

@ -23,20 +23,24 @@
#include <linux/hrtimer.h>
#include <linux/workqueue.h>
struct arch_timer_kvm {
struct arch_timer_context {
/* Registers: control register, timer value */
u32 cnt_ctl;
u64 cnt_cval;
/* Timer IRQ */
struct kvm_irq_level irq;
/* Active IRQ state caching */
bool active_cleared_last;
/* Virtual offset */
u64 cntvoff;
};
struct arch_timer_cpu {
/* Registers: control register, timer value */
u32 cntv_ctl; /* Saved/restored */
u64 cntv_cval; /* Saved/restored */
/*
* Anything that is not used directly from assembly code goes
* here.
*/
struct arch_timer_context vtimer;
struct arch_timer_context ptimer;
/* Background timer used when the guest is not running */
struct hrtimer timer;
@ -47,21 +51,15 @@ struct arch_timer_cpu {
/* Background timer active */
bool armed;
/* Timer IRQ */
struct kvm_irq_level irq;
/* Active IRQ state caching */
bool active_cleared_last;
/* Is the timer enabled */
bool enabled;
};
int kvm_timer_hyp_init(void);
int kvm_timer_enable(struct kvm_vcpu *vcpu);
void kvm_timer_init(struct kvm *kvm);
int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
const struct kvm_irq_level *irq);
const struct kvm_irq_level *virt_irq,
const struct kvm_irq_level *phys_irq);
void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu);
void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);
@ -70,11 +68,16 @@ void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
bool kvm_timer_should_fire(struct kvm_vcpu *vcpu);
bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx);
void kvm_timer_schedule(struct kvm_vcpu *vcpu);
void kvm_timer_unschedule(struct kvm_vcpu *vcpu);
u64 kvm_phys_timer_read(void);
void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);
void kvm_timer_init_vhe(void);
#define vcpu_vtimer(v) (&(v)->arch.timer_cpu.vtimer)
#define vcpu_ptimer(v) (&(v)->arch.timer_cpu.ptimer)
#endif

18
include/kvm/arm_vgic.h
View File

@ -71,6 +71,8 @@ struct vgic_global {
/* GIC system register CPU interface */
struct static_key_false gicv3_cpuif;
u32 ich_vtr_el2;
};
extern struct vgic_global kvm_vgic_global_state;
@ -101,9 +103,10 @@ struct vgic_irq {
*/
u32 intid; /* Guest visible INTID */
bool pending;
bool line_level; /* Level only */
bool soft_pending; /* Level only */
bool pending_latch; /* The pending latch state used to calculate
* the pending state for both level
* and edge triggered IRQs. */
bool active; /* not used for LPIs */
bool enabled;
bool hw; /* Tied to HW IRQ */
@ -165,6 +168,8 @@ struct vgic_its {
struct list_head collection_list;
};
struct vgic_state_iter;
struct vgic_dist {
bool in_kernel;
bool ready;
@ -212,6 +217,9 @@ struct vgic_dist {
spinlock_t lpi_list_lock;
struct list_head lpi_list_head;
int lpi_list_count;
/* used by vgic-debug */
struct vgic_state_iter *iter;
};
struct vgic_v2_cpu_if {
@ -269,6 +277,12 @@ struct vgic_cpu {
u64 pendbaser;
bool lpis_enabled;
/* Cache guest priority bits */
u32 num_pri_bits;
/* Cache guest interrupt ID bits */
u32 num_id_bits;
};
extern struct static_key_false vgic_v2_cpuif_trap;

45
include/linux/irqchip/arm-gic-v3.h
View File

@ -349,8 +349,30 @@
/*
* CPU interface registers
*/
#define ICC_CTLR_EL1_EOImode_drop_dir (0U << 1)
#define ICC_CTLR_EL1_EOImode_drop (1U << 1)
#define ICC_CTLR_EL1_EOImode_SHIFT (1)
#define ICC_CTLR_EL1_EOImode_drop_dir (0U << ICC_CTLR_EL1_EOImode_SHIFT)
#define ICC_CTLR_EL1_EOImode_drop (1U << ICC_CTLR_EL1_EOImode_SHIFT)
#define ICC_CTLR_EL1_EOImode_MASK (1 << ICC_CTLR_EL1_EOImode_SHIFT)
#define ICC_CTLR_EL1_CBPR_SHIFT 0
#define ICC_CTLR_EL1_CBPR_MASK (1 << ICC_CTLR_EL1_CBPR_SHIFT)
#define ICC_CTLR_EL1_PRI_BITS_SHIFT 8
#define ICC_CTLR_EL1_PRI_BITS_MASK (0x7 << ICC_CTLR_EL1_PRI_BITS_SHIFT)
#define ICC_CTLR_EL1_ID_BITS_SHIFT 11
#define ICC_CTLR_EL1_ID_BITS_MASK (0x7 << ICC_CTLR_EL1_ID_BITS_SHIFT)
#define ICC_CTLR_EL1_SEIS_SHIFT 14
#define ICC_CTLR_EL1_SEIS_MASK (0x1 << ICC_CTLR_EL1_SEIS_SHIFT)
#define ICC_CTLR_EL1_A3V_SHIFT 15
#define ICC_CTLR_EL1_A3V_MASK (0x1 << ICC_CTLR_EL1_A3V_SHIFT)
#define ICC_PMR_EL1_SHIFT 0
#define ICC_PMR_EL1_MASK (0xff << ICC_PMR_EL1_SHIFT)
#define ICC_BPR0_EL1_SHIFT 0
#define ICC_BPR0_EL1_MASK (0x7 << ICC_BPR0_EL1_SHIFT)
#define ICC_BPR1_EL1_SHIFT 0
#define ICC_BPR1_EL1_MASK (0x7 << ICC_BPR1_EL1_SHIFT)
#define ICC_IGRPEN0_EL1_SHIFT 0
#define ICC_IGRPEN0_EL1_MASK (1 << ICC_IGRPEN0_EL1_SHIFT)
#define ICC_IGRPEN1_EL1_SHIFT 0
#define ICC_IGRPEN1_EL1_MASK (1 << ICC_IGRPEN1_EL1_SHIFT)
#define ICC_SRE_EL1_SRE (1U << 0)
/*
@ -379,14 +401,29 @@
#define ICH_HCR_EN (1 << 0)
#define ICH_HCR_UIE (1 << 1)
#define ICH_VMCR_CTLR_SHIFT 0
#define ICH_VMCR_CTLR_MASK (0x21f << ICH_VMCR_CTLR_SHIFT)
#define ICH_VMCR_CBPR_SHIFT 4
#define ICH_VMCR_CBPR_MASK (1 << ICH_VMCR_CBPR_SHIFT)
#define ICH_VMCR_EOIM_SHIFT 9
#define ICH_VMCR_EOIM_MASK (1 << ICH_VMCR_EOIM_SHIFT)
#define ICH_VMCR_BPR1_SHIFT 18
#define ICH_VMCR_BPR1_MASK (7 << ICH_VMCR_BPR1_SHIFT)
#define ICH_VMCR_BPR0_SHIFT 21
#define ICH_VMCR_BPR0_MASK (7 << ICH_VMCR_BPR0_SHIFT)
#define ICH_VMCR_PMR_SHIFT 24
#define ICH_VMCR_PMR_MASK (0xffUL << ICH_VMCR_PMR_SHIFT)
#define ICH_VMCR_ENG0_SHIFT 0
#define ICH_VMCR_ENG0_MASK (1 << ICH_VMCR_ENG0_SHIFT)
#define ICH_VMCR_ENG1_SHIFT 1
#define ICH_VMCR_ENG1_MASK (1 << ICH_VMCR_ENG1_SHIFT)
#define ICH_VTR_PRI_BITS_SHIFT 29
#define ICH_VTR_PRI_BITS_MASK (7 << ICH_VTR_PRI_BITS_SHIFT)
#define ICH_VTR_ID_BITS_SHIFT 23
#define ICH_VTR_ID_BITS_MASK (7 << ICH_VTR_ID_BITS_SHIFT)
#define ICH_VTR_SEIS_SHIFT 22
#define ICH_VTR_SEIS_MASK (1 << ICH_VTR_SEIS_SHIFT)
#define ICH_VTR_A3V_SHIFT 21
#define ICH_VTR_A3V_MASK (1 << ICH_VTR_A3V_SHIFT)
#define ICC_IAR1_EL1_SPURIOUS 0x3ff

18
include/linux/kvm_host.h
View File

@ -45,7 +45,6 @@
* include/linux/kvm_h.
*/
#define KVM_MEMSLOT_INVALID (1UL << 16)
#define KVM_MEMSLOT_INCOHERENT (1UL << 17)
/* Two fragments for cross MMIO pages. */
#define KVM_MAX_MMIO_FRAGMENTS 2
@ -222,7 +221,6 @@ struct kvm_vcpu {
struct mutex mutex;
struct kvm_run *run;
int fpu_active;
int guest_fpu_loaded, guest_xcr0_loaded;
struct swait_queue_head wq;
struct pid *pid;
@ -642,18 +640,18 @@ int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
unsigned long len);
int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
void *data, unsigned long len);
int kvm_vcpu_read_guest_cached(struct kvm_vcpu *vcpu, struct gfn_to_hva_cache *ghc,
void *data, unsigned long len);
int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
int offset, int len);
int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
unsigned long len);
int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
void *data, unsigned long len);
int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
void *data, int offset, unsigned long len);
int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
gpa_t gpa, unsigned long len);
int kvm_vcpu_write_guest_cached(struct kvm_vcpu *v, struct gfn_to_hva_cache *ghc,
void *data, unsigned long len);
int kvm_vcpu_write_guest_offset_cached(struct kvm_vcpu *v, struct gfn_to_hva_cache *ghc,
void *data, int offset, unsigned long len);
int kvm_vcpu_gfn_to_hva_cache_init(struct kvm_vcpu *v, struct gfn_to_hva_cache *ghc,
gpa_t gpa, unsigned long len);
int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);

15
include/uapi/linux/kvm.h
View File

@ -218,7 +218,8 @@ struct kvm_hyperv_exit {
struct kvm_run {
/* in */
__u8 request_interrupt_window;
__u8 padding1[7];
__u8 immediate_exit;
__u8 padding1[6];
/* out */
__u32 exit_reason;
@ -685,6 +686,13 @@ struct kvm_ppc_smmu_info {
struct kvm_ppc_one_seg_page_size sps[KVM_PPC_PAGE_SIZES_MAX_SZ];
};
/* for KVM_PPC_RESIZE_HPT_{PREPARE,COMMIT} */
struct kvm_ppc_resize_hpt {
__u64 flags;
__u32 shift;
__u32 pad;
};
#define KVMIO 0xAE
/* machine type bits, to be used as argument to KVM_CREATE_VM */
@ -871,8 +879,10 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_S390_USER_INSTR0 130
#define KVM_CAP_MSI_DEVID 131
#define KVM_CAP_PPC_HTM 132
#define KVM_CAP_SPAPR_RESIZE_HPT 133
#define KVM_CAP_PPC_MMU_RADIX 134
#define KVM_CAP_PPC_MMU_HASH_V3 135
#define KVM_CAP_IMMEDIATE_EXIT 136
#ifdef KVM_CAP_IRQ_ROUTING
@ -1189,6 +1199,9 @@ struct kvm_s390_ucas_mapping {
#define KVM_ARM_SET_DEVICE_ADDR _IOW(KVMIO, 0xab, struct kvm_arm_device_addr)
/* Available with KVM_CAP_PPC_RTAS */
#define KVM_PPC_RTAS_DEFINE_TOKEN _IOW(KVMIO, 0xac, struct kvm_rtas_token_args)
/* Available with KVM_CAP_SPAPR_RESIZE_HPT */
#define KVM_PPC_RESIZE_HPT_PREPARE _IOR(KVMIO, 0xad, struct kvm_ppc_resize_hpt)
#define KVM_PPC_RESIZE_HPT_COMMIT _IOR(KVMIO, 0xae, struct kvm_ppc_resize_hpt)
/* Available with KVM_CAP_PPC_RADIX_MMU or KVM_CAP_PPC_HASH_MMU_V3 */
#define KVM_PPC_CONFIGURE_V3_MMU _IOW(KVMIO, 0xaf, struct kvm_ppc_mmuv3_cfg)
/* Available with KVM_CAP_PPC_RADIX_MMU */

2
include/uapi/linux/kvm_para.h
View File

@ -14,6 +14,7 @@
#define KVM_EFAULT EFAULT
#define KVM_E2BIG E2BIG
#define KVM_EPERM EPERM
#define KVM_EOPNOTSUPP 95
#define KVM_HC_VAPIC_POLL_IRQ 1
#define KVM_HC_MMU_OP 2
@ -23,6 +24,7 @@
#define KVM_HC_MIPS_GET_CLOCK_FREQ 6
#define KVM_HC_MIPS_EXIT_VM 7
#define KVM_HC_MIPS_CONSOLE_OUTPUT 8
#define KVM_HC_CLOCK_PAIRING 9
/*
* hypercalls use architecture specific

201
virt/kvm/arm/arch_timer.c
View File

@ -37,10 +37,10 @@ static u32 host_vtimer_irq_flags;
void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu)
{
vcpu->arch.timer_cpu.active_cleared_last = false;
vcpu_vtimer(vcpu)->active_cleared_last = false;
}
static u64 kvm_phys_timer_read(void)
u64 kvm_phys_timer_read(void)
{
return timecounter->cc->read(timecounter->cc);
}
@ -98,12 +98,12 @@ static void kvm_timer_inject_irq_work(struct work_struct *work)
kvm_vcpu_kick(vcpu);
}
static u64 kvm_timer_compute_delta(struct kvm_vcpu *vcpu)
static u64 kvm_timer_compute_delta(struct arch_timer_context *timer_ctx)
{
u64 cval, now;
cval = vcpu->arch.timer_cpu.cntv_cval;
now = kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff;
cval = timer_ctx->cnt_cval;
now = kvm_phys_timer_read() - timer_ctx->cntvoff;
if (now < cval) {
u64 ns;
@ -118,6 +118,35 @@ static u64 kvm_timer_compute_delta(struct kvm_vcpu *vcpu)
return 0;
}
static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx)
{
return !(timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_IT_MASK) &&
(timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_ENABLE);
}
/*
* Returns the earliest expiration time in ns among guest timers.
* Note that it will return 0 if none of timers can fire.
*/
static u64 kvm_timer_earliest_exp(struct kvm_vcpu *vcpu)
{
u64 min_virt = ULLONG_MAX, min_phys = ULLONG_MAX;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
if (kvm_timer_irq_can_fire(vtimer))
min_virt = kvm_timer_compute_delta(vtimer);
if (kvm_timer_irq_can_fire(ptimer))
min_phys = kvm_timer_compute_delta(ptimer);
/* If none of timers can fire, then return 0 */
if ((min_virt == ULLONG_MAX) && (min_phys == ULLONG_MAX))
return 0;
return min(min_virt, min_phys);
}
static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt)
{
struct arch_timer_cpu *timer;
@ -132,7 +161,7 @@ static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt)
* PoV (NTP on the host may have forced it to expire
* early). If we should have slept longer, restart it.
*/
ns = kvm_timer_compute_delta(vcpu);
ns = kvm_timer_earliest_exp(vcpu);
if (unlikely(ns)) {
hrtimer_forward_now(hrt, ns_to_ktime(ns));
return HRTIMER_RESTART;
@ -142,42 +171,33 @@ static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt)
return HRTIMER_NORESTART;
}
static bool kvm_timer_irq_can_fire(struct kvm_vcpu *vcpu)
bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
return !(timer->cntv_ctl & ARCH_TIMER_CTRL_IT_MASK) &&
(timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE);
}
bool kvm_timer_should_fire(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
u64 cval, now;
if (!kvm_timer_irq_can_fire(vcpu))
if (!kvm_timer_irq_can_fire(timer_ctx))
return false;
cval = timer->cntv_cval;
now = kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff;
cval = timer_ctx->cnt_cval;
now = kvm_phys_timer_read() - timer_ctx->cntvoff;
return cval <= now;
}
static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level)
static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level,
struct arch_timer_context *timer_ctx)
{
int ret;
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
BUG_ON(!vgic_initialized(vcpu->kvm));
timer->active_cleared_last = false;
timer->irq.level = new_level;
trace_kvm_timer_update_irq(vcpu->vcpu_id, timer->irq.irq,
timer->irq.level);
ret = kvm_vgic_inject_mapped_irq(vcpu->kvm, vcpu->vcpu_id,
timer->irq.irq,
timer->irq.level);
timer_ctx->active_cleared_last = false;
timer_ctx->irq.level = new_level;
trace_kvm_timer_update_irq(vcpu->vcpu_id, timer_ctx->irq.irq,
timer_ctx->irq.level);
ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id, timer_ctx->irq.irq,
timer_ctx->irq.level);
WARN_ON(ret);
}
@ -188,22 +208,43 @@ static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level)
static int kvm_timer_update_state(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
/*
* If userspace modified the timer registers via SET_ONE_REG before
* the vgic was initialized, we mustn't set the timer->irq.level value
* the vgic was initialized, we mustn't set the vtimer->irq.level value
* because the guest would never see the interrupt. Instead wait
* until we call this function from kvm_timer_flush_hwstate.
*/
if (!vgic_initialized(vcpu->kvm) || !timer->enabled)
return -ENODEV;
if (kvm_timer_should_fire(vcpu) != timer->irq.level)
kvm_timer_update_irq(vcpu, !timer->irq.level);
if (kvm_timer_should_fire(vtimer) != vtimer->irq.level)
kvm_timer_update_irq(vcpu, !vtimer->irq.level, vtimer);
if (kvm_timer_should_fire(ptimer) != ptimer->irq.level)
kvm_timer_update_irq(vcpu, !ptimer->irq.level, ptimer);
return 0;
}
/* Schedule the background timer for the emulated timer. */
static void kvm_timer_emulate(struct kvm_vcpu *vcpu,
struct arch_timer_context *timer_ctx)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
if (kvm_timer_should_fire(timer_ctx))
return;
if (!kvm_timer_irq_can_fire(timer_ctx))
return;
/* The timer has not yet expired, schedule a background timer */
timer_arm(timer, kvm_timer_compute_delta(timer_ctx));
}
/*
* Schedule the background timer before calling kvm_vcpu_block, so that this
* thread is removed from its waitqueue and made runnable when there's a timer
@ -212,26 +253,31 @@ static int kvm_timer_update_state(struct kvm_vcpu *vcpu)
void kvm_timer_schedule(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
BUG_ON(timer_is_armed(timer));
/*
* No need to schedule a background timer if the guest timer has
* No need to schedule a background timer if any guest timer has
* already expired, because kvm_vcpu_block will return before putting
* the thread to sleep.
*/
if (kvm_timer_should_fire(vcpu))
if (kvm_timer_should_fire(vtimer) || kvm_timer_should_fire(ptimer))
return;
/*
* If the timer is not capable of raising interrupts (disabled or
* If both timers are not capable of raising interrupts (disabled or
* masked), then there's no more work for us to do.
*/
if (!kvm_timer_irq_can_fire(vcpu))
if (!kvm_timer_irq_can_fire(vtimer) && !kvm_timer_irq_can_fire(ptimer))
return;
/* The timer has not yet expired, schedule a background timer */
timer_arm(timer, kvm_timer_compute_delta(vcpu));
/*
* The guest timers have not yet expired, schedule a background timer.
* Set the earliest expiration time among the guest timers.
*/
timer_arm(timer, kvm_timer_earliest_exp(vcpu));
}
void kvm_timer_unschedule(struct kvm_vcpu *vcpu)
@ -249,13 +295,16 @@ void kvm_timer_unschedule(struct kvm_vcpu *vcpu)
*/
void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
bool phys_active;
int ret;
if (kvm_timer_update_state(vcpu))
return;
/* Set the background timer for the physical timer emulation. */
kvm_timer_emulate(vcpu, vcpu_ptimer(vcpu));
/*
* If we enter the guest with the virtual input level to the VGIC
* asserted, then we have already told the VGIC what we need to, and
@ -273,8 +322,8 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
* to ensure that hardware interrupts from the timer triggers a guest
* exit.
*/
phys_active = timer->irq.level ||
kvm_vgic_map_is_active(vcpu, timer->irq.irq);
phys_active = vtimer->irq.level ||
kvm_vgic_map_is_active(vcpu, vtimer->irq.irq);
/*
* We want to avoid hitting the (re)distributor as much as
@ -296,7 +345,7 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
* - cached value is "active clear"
* - value to be programmed is "active clear"
*/
if (timer->active_cleared_last && !phys_active)
if (vtimer->active_cleared_last && !phys_active)
return;
ret = irq_set_irqchip_state(host_vtimer_irq,
@ -304,7 +353,7 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
phys_active);
WARN_ON(ret);
timer->active_cleared_last = !phys_active;
vtimer->active_cleared_last = !phys_active;
}
/**
@ -318,7 +367,11 @@ void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
BUG_ON(timer_is_armed(timer));
/*
* This is to cancel the background timer for the physical timer
* emulation if it is set.
*/
timer_disarm(timer);
/*
* The guest could have modified the timer registers or the timer
@ -328,9 +381,11 @@ void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu)
}
int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
const struct kvm_irq_level *irq)
const struct kvm_irq_level *virt_irq,
const struct kvm_irq_level *phys_irq)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
/*
* The vcpu timer irq number cannot be determined in
@ -338,7 +393,8 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
* kvm_vcpu_set_target(). To handle this, we determine
* vcpu timer irq number when the vcpu is reset.
*/
timer->irq.irq = irq->irq;
vtimer->irq.irq = virt_irq->irq;
ptimer->irq.irq = phys_irq->irq;
/*
* The bits in CNTV_CTL are architecturally reset to UNKNOWN for ARMv8
@ -346,16 +402,40 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
* resets the timer to be disabled and unmasked and is compliant with
* the ARMv7 architecture.
*/
timer->cntv_ctl = 0;
vtimer->cnt_ctl = 0;
ptimer->cnt_ctl = 0;
kvm_timer_update_state(vcpu);
return 0;
}
/* Make the updates of cntvoff for all vtimer contexts atomic */
static void update_vtimer_cntvoff(struct kvm_vcpu *vcpu, u64 cntvoff)
{
int i;
struct kvm *kvm = vcpu->kvm;
struct kvm_vcpu *tmp;
mutex_lock(&kvm->lock);
kvm_for_each_vcpu(i, tmp, kvm)
vcpu_vtimer(tmp)->cntvoff = cntvoff;
/*
* When called from the vcpu create path, the CPU being created is not
* included in the loop above, so we just set it here as well.
*/
vcpu_vtimer(vcpu)->cntvoff = cntvoff;
mutex_unlock(&kvm->lock);
}
void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
/* Synchronize cntvoff across all vtimers of a VM. */
update_vtimer_cntvoff(vcpu, kvm_phys_timer_read());
vcpu_ptimer(vcpu)->cntvoff = 0;
INIT_WORK(&timer->expired, kvm_timer_inject_irq_work);
hrtimer_init(&timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
timer->timer.function = kvm_timer_expire;
@ -368,17 +448,17 @@ static void kvm_timer_init_interrupt(void *info)
int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
switch (regid) {
case KVM_REG_ARM_TIMER_CTL:
timer->cntv_ctl = value;
vtimer->cnt_ctl = value;
break;
case KVM_REG_ARM_TIMER_CNT:
vcpu->kvm->arch.timer.cntvoff = kvm_phys_timer_read() - value;
update_vtimer_cntvoff(vcpu, kvm_phys_timer_read() - value);
break;
case KVM_REG_ARM_TIMER_CVAL:
timer->cntv_cval = value;
vtimer->cnt_cval = value;
break;
default:
return -1;
@ -390,15 +470,15 @@ int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
u64 kvm_arm_timer_get_reg(struct kvm_vcpu *vcpu, u64 regid)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
switch (regid) {
case KVM_REG_ARM_TIMER_CTL:
return timer->cntv_ctl;
return vtimer->cnt_ctl;
case KVM_REG_ARM_TIMER_CNT:
return kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff;
return kvm_phys_timer_read() - vtimer->cntvoff;
case KVM_REG_ARM_TIMER_CVAL:
return timer->cntv_cval;
return vtimer->cnt_cval;
}
return (u64)-1;
}
@ -462,14 +542,16 @@ int kvm_timer_hyp_init(void)
void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
timer_disarm(timer);
kvm_vgic_unmap_phys_irq(vcpu, timer->irq.irq);
kvm_vgic_unmap_phys_irq(vcpu, vtimer->irq.irq);
}
int kvm_timer_enable(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct irq_desc *desc;
struct irq_data *data;
int phys_irq;
@ -497,7 +579,7 @@ int kvm_timer_enable(struct kvm_vcpu *vcpu)
* Tell the VGIC that the virtual interrupt is tied to a
* physical interrupt. We do that once per VCPU.
*/
ret = kvm_vgic_map_phys_irq(vcpu, timer->irq.irq, phys_irq);
ret = kvm_vgic_map_phys_irq(vcpu, vtimer->irq.irq, phys_irq);
if (ret)
return ret;
@ -506,11 +588,6 @@ int kvm_timer_enable(struct kvm_vcpu *vcpu)
return 0;
}
void kvm_timer_init(struct kvm *kvm)
{
kvm->arch.timer.cntvoff = kvm_phys_timer_read();
}
/*
* On VHE system, we only need to configure trap on physical timer and counter
* accesses in EL0 and EL1 once, not for every world switch.

13
virt/kvm/arm/hyp/timer-sr.c
View File

@ -25,11 +25,12 @@
void __hyp_text __timer_save_state(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
u64 val;
if (timer->enabled) {
timer->cntv_ctl = read_sysreg_el0(cntv_ctl);
timer->cntv_cval = read_sysreg_el0(cntv_cval);
vtimer->cnt_ctl = read_sysreg_el0(cntv_ctl);
vtimer->cnt_cval = read_sysreg_el0(cntv_cval);
}
/* Disable the virtual timer */
@ -52,8 +53,8 @@ void __hyp_text __timer_save_state(struct kvm_vcpu *vcpu)
void __hyp_text __timer_restore_state(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = kern_hyp_va(vcpu->kvm);
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
u64 val;
/* Those bits are already configured at boot on VHE-system */
@ -69,9 +70,9 @@ void __hyp_text __timer_restore_state(struct kvm_vcpu *vcpu)
}
if (timer->enabled) {
write_sysreg(kvm->arch.timer.cntvoff, cntvoff_el2);
write_sysreg_el0(timer->cntv_cval, cntv_cval);
write_sysreg(vtimer->cntvoff, cntvoff_el2);
write_sysreg_el0(vtimer->cnt_cval, cntv_cval);
isb();
write_sysreg_el0(timer->cntv_ctl, cntv_ctl);
write_sysreg_el0(vtimer->cnt_ctl, cntv_ctl);
}
}

283
virt/kvm/arm/vgic/vgic-debug.c Normal file
View File

@ -0,0 +1,283 @@
/*
* Copyright (C) 2016 Linaro
* Author: Christoffer Dall <christoffer.dall@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/cpu.h>
#include <linux/debugfs.h>
#include <linux/interrupt.h>
#include <linux/kvm_host.h>
#include <linux/seq_file.h>
#include <kvm/arm_vgic.h>
#include <asm/kvm_mmu.h>
#include "vgic.h"
/*
* Structure to control looping through the entire vgic state. We start at
* zero for each field and move upwards. So, if dist_id is 0 we print the
* distributor info. When dist_id is 1, we have already printed it and move
* on.
*
* When vcpu_id < nr_cpus we print the vcpu info until vcpu_id == nr_cpus and
* so on.
*/
struct vgic_state_iter {
int nr_cpus;
int nr_spis;
int dist_id;
int vcpu_id;
int intid;
};
static void iter_next(struct vgic_state_iter *iter)
{
if (iter->dist_id == 0) {
iter->dist_id++;
return;
}
iter->intid++;
if (iter->intid == VGIC_NR_PRIVATE_IRQS &&
++iter->vcpu_id < iter->nr_cpus)
iter->intid = 0;
}
static void iter_init(struct kvm *kvm, struct vgic_state_iter *iter,
loff_t pos)
{
int nr_cpus = atomic_read(&kvm->online_vcpus);
memset(iter, 0, sizeof(*iter));
iter->nr_cpus = nr_cpus;
iter->nr_spis = kvm->arch.vgic.nr_spis;
/* Fast forward to the right position if needed */
while (pos--)
iter_next(iter);
}
static bool end_of_vgic(struct vgic_state_iter *iter)
{
return iter->dist_id > 0 &&
iter->vcpu_id == iter->nr_cpus &&
(iter->intid - VGIC_NR_PRIVATE_IRQS) == iter->nr_spis;
}
static void *vgic_debug_start(struct seq_file *s, loff_t *pos)
{
struct kvm *kvm = (struct kvm *)s->private;
struct vgic_state_iter *iter;
mutex_lock(&kvm->lock);
iter = kvm->arch.vgic.iter;
if (iter) {
iter = ERR_PTR(-EBUSY);
goto out;
}
iter = kmalloc(sizeof(*iter), GFP_KERNEL);
if (!iter) {
iter = ERR_PTR(-ENOMEM);
goto out;
}
iter_init(kvm, iter, *pos);
kvm->arch.vgic.iter = iter;
if (end_of_vgic(iter))
iter = NULL;
out:
mutex_unlock(&kvm->lock);
return iter;
}
static void *vgic_debug_next(struct seq_file *s, void *v, loff_t *pos)
{
struct kvm *kvm = (struct kvm *)s->private;
struct vgic_state_iter *iter = kvm->arch.vgic.iter;
++*pos;
iter_next(iter);
if (end_of_vgic(iter))
iter = NULL;
return iter;
}
static void vgic_debug_stop(struct seq_file *s, void *v)
{
struct kvm *kvm = (struct kvm *)s->private;
struct vgic_state_iter *iter;
/*
* If the seq file wasn't properly opened, there's nothing to clearn
* up.
*/
if (IS_ERR(v))
return;
mutex_lock(&kvm->lock);
iter = kvm->arch.vgic.iter;
kfree(iter);
kvm->arch.vgic.iter = NULL;
mutex_unlock(&kvm->lock);
}
static void print_dist_state(struct seq_file *s, struct vgic_dist *dist)
{
seq_printf(s, "Distributor\n");
seq_printf(s, "===========\n");
seq_printf(s, "vgic_model:\t%s\n",
(dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) ?
"GICv3" : "GICv2");
seq_printf(s, "nr_spis:\t%d\n", dist->nr_spis);
seq_printf(s, "enabled:\t%d\n", dist->enabled);
seq_printf(s, "\n");
seq_printf(s, "P=pending_latch, L=line_level, A=active\n");
seq_printf(s, "E=enabled, H=hw, C=config (level=1, edge=0)\n");
}
static void print_header(struct seq_file *s, struct vgic_irq *irq,
struct kvm_vcpu *vcpu)
{
int id = 0;
char *hdr = "SPI ";
if (vcpu) {
hdr = "VCPU";
id = vcpu->vcpu_id;
}
seq_printf(s, "\n");
seq_printf(s, "%s%2d TYP ID TGT_ID PLAEHC HWID TARGET SRC PRI VCPU_ID\n", hdr, id);
seq_printf(s, "---------------------------------------------------------------\n");
}
static void print_irq_state(struct seq_file *s, struct vgic_irq *irq,
struct kvm_vcpu *vcpu)
{
char *type;
if (irq->intid < VGIC_NR_SGIS)
type = "SGI";
else if (irq->intid < VGIC_NR_PRIVATE_IRQS)
type = "PPI";
else
type = "SPI";
if (irq->intid ==0 || irq->intid == VGIC_NR_PRIVATE_IRQS)
print_header(s, irq, vcpu);
seq_printf(s, " %s %4d "
" %2d "
"%d%d%d%d%d%d "
"%8d "
"%8x "
" %2x "
"%3d "
" %2d "
"\n",
type, irq->intid,
(irq->target_vcpu) ? irq->target_vcpu->vcpu_id : -1,
irq->pending_latch,
irq->line_level,
irq->active,
irq->enabled,
irq->hw,
irq->config == VGIC_CONFIG_LEVEL,
irq->hwintid,
irq->mpidr,
irq->source,
irq->priority,
(irq->vcpu) ? irq->vcpu->vcpu_id : -1);
}
static int vgic_debug_show(struct seq_file *s, void *v)
{
struct kvm *kvm = (struct kvm *)s->private;
struct vgic_state_iter *iter = (struct vgic_state_iter *)v;
struct vgic_irq *irq;
struct kvm_vcpu *vcpu = NULL;
if (iter->dist_id == 0) {
print_dist_state(s, &kvm->arch.vgic);
return 0;
}
if (!kvm->arch.vgic.initialized)
return 0;
if (iter->vcpu_id < iter->nr_cpus) {
vcpu = kvm_get_vcpu(kvm, iter->vcpu_id);
irq = &vcpu->arch.vgic_cpu.private_irqs[iter->intid];
} else {
irq = &kvm->arch.vgic.spis[iter->intid - VGIC_NR_PRIVATE_IRQS];
}
spin_lock(&irq->irq_lock);
print_irq_state(s, irq, vcpu);
spin_unlock(&irq->irq_lock);
return 0;
}
static struct seq_operations vgic_debug_seq_ops = {
.start = vgic_debug_start,
.next = vgic_debug_next,
.stop = vgic_debug_stop,
.show = vgic_debug_show
};
static int debug_open(struct inode *inode, struct file *file)
{
int ret;
ret = seq_open(file, &vgic_debug_seq_ops);
if (!ret) {
struct seq_file *seq;
/* seq_open will have modified file->private_data */
seq = file->private_data;
seq->private = inode->i_private;
}
return ret;
};
static struct file_operations vgic_debug_fops = {
.owner = THIS_MODULE,
.open = debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release
};
int vgic_debug_init(struct kvm *kvm)
{
if (!kvm->debugfs_dentry)
return -ENOENT;
if (!debugfs_create_file("vgic-state", 0444,
kvm->debugfs_dentry,
kvm,
&vgic_debug_fops))
return -ENOMEM;
return 0;
}
int vgic_debug_destroy(struct kvm *kvm)
{
return 0;
}

4
virt/kvm/arm/vgic/vgic-init.c
View File

@ -259,6 +259,8 @@ int vgic_init(struct kvm *kvm)
if (ret)
goto out;
vgic_debug_init(kvm);
dist->initialized = true;
out:
return ret;
@ -288,6 +290,8 @@ static void __kvm_vgic_destroy(struct kvm *kvm)
struct kvm_vcpu *vcpu;
int i;
vgic_debug_destroy(kvm);
kvm_vgic_dist_destroy(kvm);
kvm_for_each_vcpu(i, vcpu, kvm)

3
virt/kvm/arm/vgic/vgic-irqfd.c
View File

@ -99,6 +99,9 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
if (!vgic_has_its(kvm))
return -ENODEV;
if (!level)
return -1;
return vgic_its_inject_msi(kvm, &msi);
}

6
virt/kvm/arm/vgic/vgic-its.c
View File

@ -350,7 +350,7 @@ static int its_sync_lpi_pending_table(struct kvm_vcpu *vcpu)
irq = vgic_get_irq(vcpu->kvm, NULL, intids[i]);
spin_lock(&irq->irq_lock);
irq->pending = pendmask & (1U << bit_nr);
irq->pending_latch = pendmask & (1U << bit_nr);
vgic_queue_irq_unlock(vcpu->kvm, irq);
vgic_put_irq(vcpu->kvm, irq);
}
@ -465,7 +465,7 @@ static int vgic_its_trigger_msi(struct kvm *kvm, struct vgic_its *its,
return -EBUSY;
spin_lock(&itte->irq->irq_lock);
itte->irq->pending = true;
itte->irq->pending_latch = true;
vgic_queue_irq_unlock(kvm, itte->irq);
return 0;
@ -913,7 +913,7 @@ static int vgic_its_cmd_handle_clear(struct kvm *kvm, struct vgic_its *its,
if (!itte)
return E_ITS_CLEAR_UNMAPPED_INTERRUPT;
itte->irq->pending = false;
itte->irq->pending_latch = false;
return 0;
}

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