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KVM fixes for v4.14-rc4 

- fix PPC XIVE interrupt delivery
 - fix x86 RCU breakage from asynchronous page faults when built without
   PREEMPT_COUNT
 - fix x86 build with -frecord-gcc-switches
 - fix x86 build without X86_LOCAL_APIC
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull KVM fixes from Radim Krčmář:

 - fix PPC XIVE interrupt delivery

 - fix x86 RCU breakage from asynchronous page faults when built without
   PREEMPT_COUNT

 - fix x86 build with -frecord-gcc-switches

 - fix x86 build without X86_LOCAL_APIC

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: add X86_LOCAL_APIC dependency
  x86/kvm: Move kvm_fastop_exception to .fixup section
  kvm/x86: Avoid async PF preempting the kernel incorrectly
  KVM: PPC: Book3S: Fix server always zero from kvmppc_xive_get_xive()
This commit is contained in:
Linus Torvalds 2017-10-06 11:28:34 -07:00
parent d109d83fc8 e42eef4ba3
commit 8d473320ee
7 changed files with 20 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/powerpc/kvm/book3s_xive.c
View File

@ -622,7 +622,7 @@ int kvmppc_xive_get_xive(struct kvm *kvm, u32 irq, u32 *server,
return -EINVAL;
state = &sb->irq_state[idx];
arch_spin_lock(&sb->lock);
*server = state->guest_server;
*server = state->act_server;
*priority = state->guest_priority;
arch_spin_unlock(&sb->lock);
@ -1331,7 +1331,7 @@ static int xive_get_source(struct kvmppc_xive *xive, long irq, u64 addr)
xive->saved_src_count++;
/* Convert saved state into something compatible with xics */
val = state->guest_server;
val = state->act_server;
prio = state->saved_scan_prio;
if (prio == MASKED) {
@ -1507,7 +1507,6 @@ static int xive_set_source(struct kvmppc_xive *xive, long irq, u64 addr)
/* First convert prio and mark interrupt as untargetted */
act_prio = xive_prio_from_guest(guest_prio);
state->act_priority = MASKED;
state->guest_server = server;
/*
* We need to drop the lock due to the mutex below. Hopefully

1
arch/powerpc/kvm/book3s_xive.h
View File

@ -35,7 +35,6 @@ struct kvmppc_xive_irq_state {
struct xive_irq_data *pt_data; /* XIVE Pass-through associated data */
/* Targetting as set by guest */
u32 guest_server; /* Current guest selected target */
u8 guest_priority; /* Guest set priority */
u8 saved_priority; /* Saved priority when masking */

4
arch/x86/include/asm/kvm_para.h
View File

@ -88,7 +88,7 @@ static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
bool kvm_para_available(void);
unsigned int kvm_arch_para_features(void);
void __init kvm_guest_init(void);
void kvm_async_pf_task_wait(u32 token);
void kvm_async_pf_task_wait(u32 token, int interrupt_kernel);
void kvm_async_pf_task_wake(u32 token);
u32 kvm_read_and_reset_pf_reason(void);
extern void kvm_disable_steal_time(void);
@ -103,7 +103,7 @@ static inline void kvm_spinlock_init(void)
#else /* CONFIG_KVM_GUEST */
#define kvm_guest_init() do {} while (0)
#define kvm_async_pf_task_wait(T) do {} while(0)
#define kvm_async_pf_task_wait(T, I) do {} while(0)
#define kvm_async_pf_task_wake(T) do {} while(0)
static inline bool kvm_para_available(void)

14
arch/x86/kernel/kvm.c
View File

@ -117,7 +117,11 @@ static struct kvm_task_sleep_node *_find_apf_task(struct kvm_task_sleep_head *b,
return NULL;
}
void kvm_async_pf_task_wait(u32 token)
/*
* @interrupt_kernel: Is this called from a routine which interrupts the kernel
* (other than user space)?
*/
void kvm_async_pf_task_wait(u32 token, int interrupt_kernel)
{
u32 key = hash_32(token, KVM_TASK_SLEEP_HASHBITS);
struct kvm_task_sleep_head *b = &async_pf_sleepers[key];
@ -140,8 +144,10 @@ void kvm_async_pf_task_wait(u32 token)
n.token = token;
n.cpu = smp_processor_id();
n.halted = is_idle_task(current) || preempt_count() > 1 ||
rcu_preempt_depth();
n.halted = is_idle_task(current) ||
(IS_ENABLED(CONFIG_PREEMPT_COUNT)
? preempt_count() > 1 || rcu_preempt_depth()
: interrupt_kernel);
init_swait_queue_head(&n.wq);
hlist_add_head(&n.link, &b->list);
raw_spin_unlock(&b->lock);
@ -269,7 +275,7 @@ do_async_page_fault(struct pt_regs *regs, unsigned long error_code)
case KVM_PV_REASON_PAGE_NOT_PRESENT:
/* page is swapped out by the host. */
prev_state = exception_enter();
kvm_async_pf_task_wait((u32)read_cr2());
kvm_async_pf_task_wait((u32)read_cr2(), !user_mode(regs));
exception_exit(prev_state);
break;
case KVM_PV_REASON_PAGE_READY:

1
arch/x86/kvm/Kconfig
View File

@ -23,6 +23,7 @@ config KVM
depends on HIGH_RES_TIMERS
# for TASKSTATS/TASK_DELAY_ACCT:
depends on NET && MULTIUSER
depends on X86_LOCAL_APIC
select PREEMPT_NOTIFIERS
select MMU_NOTIFIER
select ANON_INODES

6
arch/x86/kvm/emulate.c
View File

@ -425,8 +425,10 @@ static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *));
#op " %al \n\t" \
FOP_RET
asm(".global kvm_fastop_exception \n"
"kvm_fastop_exception: xor %esi, %esi; ret");
asm(".pushsection .fixup, \"ax\"\n"
".global kvm_fastop_exception \n"
"kvm_fastop_exception: xor %esi, %esi; ret\n"
".popsection");
FOP_START(setcc)
FOP_SETCC(seto)

2
arch/x86/kvm/mmu.c
View File

@ -3837,7 +3837,7 @@ int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code,
case KVM_PV_REASON_PAGE_NOT_PRESENT:
vcpu->arch.apf.host_apf_reason = 0;
local_irq_disable();
kvm_async_pf_task_wait(fault_address);
kvm_async_pf_task_wait(fault_address, 0);
local_irq_enable();
break;
case KVM_PV_REASON_PAGE_READY: