Commit Graph

125411 Commits

Author SHA1 Message Date
Fan Zhang 80cd876338 KVM: s390: lazy enable RI
Only enable runtime instrumentation if the guest issues an RI related
instruction or if userspace changes the riccb to a valid state.
This makes entry/exit a tiny bit faster.

Initial patch by Christian Borntraeger
Signed-off-by: Fan Zhang <zhangfan@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2016-09-08 13:40:39 +02:00
Janosch Frank c14b88d766 KVM: s390: gaccess: simplify translation exception handling
The payload data for protection exceptions is a superset of the
payload of other translation exceptions. Let's set the additional
flags and use a fall through to minimize code duplication.

Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2016-09-08 09:07:53 +02:00
David Hildenbrand b1ffffbd0f KVM: s390: guestdbg: separate defines for per code
Let's avoid working with the PER_EVENT* defines, used for control register
manipulation, when checking the u8 PER code. Introduce separate defines
based on the existing defines.

Reviewed-by: Eric Farman <farman@linux.vnet.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2016-09-08 09:07:52 +02:00
David Hildenbrand 8953fb08ab KVM: s390: write external damage code on machine checks
Let's also write the external damage code already provided by
struct kvm_s390_mchk_info.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2016-09-08 09:07:52 +02:00
David Hildenbrand ff5dc1492a KVM: s390: fix delivery of vector regs during machine checks
Vector registers are only to be stored if the facility is available
and if the guest has set up the machine check extended save area.

If anything goes wrong while writing the vector registers, the vector
registers are to be marked as invalid. Please note that we are allowed
to write the registers although they are marked as invalid.

Machine checks and "store status" SIGP orders are two different concepts,
let's correctly separate these. As the SIGP part is completely handled in
user space, we can drop it.

This patch is based on a patch from Cornelia Huck.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2016-09-08 09:07:52 +02:00
David Hildenbrand 0319dae677 KVM: s390: split store status and machine check handling
Store status writes the prefix which is not to be done by a machine check.
Also, the psw is stored and later on overwritten by the failing-storage
address, which looks strange at first sight.

Store status and machine check handling look similar, but they are actually
two different things.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2016-09-08 09:07:51 +02:00
David Hildenbrand d6404ded30 KVM: s390: factor out actual delivery of machine checks
Let's factor this out to prepare for bigger changes. Reorder to calls to
match the logical order given in the PoP.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2016-09-08 09:07:51 +02:00
Helge Deller 3eb53b20d7 parisc: Fix order of EREFUSED define in errno.h
When building gccgo in userspace, errno.h gets parsed and the go include file
sysinfo.go is generated.

Since EREFUSED is defined to the same value as ECONNREFUSED, and ECONNREFUSED
is defined later on in errno.h, this leads to go complaining that EREFUSED
isn't defined yet.

Fix this trivial problem by moving the define of EREFUSED down after
ECONNREFUSED in errno.h (and clean up the indenting while touching this line).

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org
2016-08-20 13:33:53 +02:00
Helge Deller ae141830b1 parisc: Fix automatic selection of cr16 clocksource
Commit 54b6680090 (parisc: Add native high-resolution sched_clock()
implementation) added support to use the CPU-internal cr16 counters as reliable
clocksource with the help of HAVE_UNSTABLE_SCHED_CLOCK.

Sadly the commit missed to remove the hack which prevented cr16 to become the
default clocksource even on SMP systems.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # 4.7+
2016-08-20 13:33:51 +02:00
Linus Torvalds d8298d268a DeviceTree fixes for 4.8:
- Couple of DT node ref counting fixes
 
 - Fix __unflatten_device_tree for PPC PCI hotplug case
 
 - Rework marking irq controllers as OF_POPULATED in cases where real
 driver is used.
 
 - Disable of_platform_default_populate_init on PPC. The change in
 initcall order causes problems which need to be sorted out later.
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Merge tag 'devicetree-fixes-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux

Pull DeviceTree fixes from Rob Herring:

 - a couple of DT node ref counting fixes

 - fix __unflatten_device_tree for PPC PCI hotplug case

 - rework marking irq controllers as OF_POPULATED in cases where real
   driver is used.

 - disable of_platform_default_populate_init on PPC.  The change in
   initcall order causes problems which need to be sorted out later.

* tag 'devicetree-fixes-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  of: fix reference counting in of_graph_get_endpoint_by_regs
  of/platform: disable the of_platform_default_populate_init() for all the ppc boards
  ARM: imx6: mark GPC node as not populated after irq init to probe pm domain driver
  of/irq: Mark interrupt controllers as populated before initialisation
  drivers/of: Validate device node in __unflatten_device_tree()
  of: Delete an unnecessary check before the function call "of_node_put"
2016-08-18 19:31:08 -07:00
Linus Torvalds 3408fef744 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
 "An initrd microcode loading fix, and an SMP bootup topology setup fix
  to resolve crashes on SGI/UV systems if the BIOS is configured in a
  certain way"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/smp: Fix __max_logical_packages value setup
  x86/microcode/AMD: Fix initrd loading with CONFIG_RANDOMIZE_MEMORY=y
2016-08-18 15:09:41 -07:00
Linus Torvalds f28535c100 arm64 fixes:
- Avoid a literal load with the MMU off on the CPU resume path
   (potential inconsistency between cache and RAM)
 
 - Build error with CONFIG_ACPI=n fixed
 
 - Compiler warning in the arch/arm64/mm/dump.c code fixed
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Catalin Marinas:

 - Avoid a literal load with the MMU off on the CPU resume path
   (potential inconsistency between cache and RAM)

 - Build error with CONFIG_ACPI=n fixed

 - Compiler warning in the arch/arm64/mm/dump.c code fixed

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: Fix shift warning in arch/arm64/mm/dump.c
  arm64: kernel: avoid literal load of virtual address with MMU off
  arm64: Fix NUMA build error when !CONFIG_ACPI
2016-08-18 11:17:13 -07:00
Linus Torvalds 114e3bae37 Merge branch 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm
Pull ARM fixes from Russell King:
 "Only three fixes this time:

   - Emil found an overflow problem with the memory layout sanity check.

   - Ard Biesheuvel noticed that late-allocated page tables (for EFI)
     weren't being properly constructed.

   - Guenter Roeck reported a problem found on qemu caused by the recent
     addr_limit changes"

* 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: fix address limit restoration for undefined instructions
  ARM: 8591/1: mm: use fully constructed struct pages for EFI pgd allocations
  ARM: 8590/1: sanity_check_meminfo(): avoid overflow on vmalloc_limit
2016-08-18 11:13:20 -07:00
Linus Torvalds 395c434292 Power management updates for v4.8-rc3
- Fix a hibernate core regression resulting from uncovering a
    latent bug in its implementation of memory bitmaps by a recent
    commit (James Morse).
 
  - Use __pa() to compute a physical address in the x86-64 code
    finalizing resume from hibernation (Rafael Wysocki).
 
  - Update power management documentation related to system sleep
    states to remove outdated information from it and to add a
    description of a recently introduced hibernation debug feature
    to it (Rafael Wysocki).
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Merge tag 'pm-4.8-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "More hibernation-related material: one fix for a recent regression in
  the core, one small cleanup of the x86-64 resume code and a
  documentation update.

  Specifics:

   - Fix a hibernate core regression resulting from uncovering a latent
     bug in its implementation of memory bitmaps by a recent commit
     (James Morse).

   - Use __pa() to compute a physical address in the x86-64 code
     finalizing resume from hibernation (Rafael Wysocki).

   - Update power management documentation related to system sleep
     states to remove outdated information from it and to add a
     description of a recently introduced hibernation debug feature to
     it (Rafael Wysocki)"

* tag 'pm-4.8-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM / hibernate: Fix rtree_next_node() to avoid walking off list ends
  x86/power/64: Use __pa() for physical address computation
  PM / sleep: Update some system sleep documentation
2016-08-18 11:09:43 -07:00
Catalin Marinas a93a4d6232 arm64: Fix shift warning in arch/arm64/mm/dump.c
When building with 48-bit VAs and 16K page configuration, it's possible
to get the following warning when building the arm64 page table dumping
code:

arch/arm64/mm/dump.c: In function ‘walk_pud’:
arch/arm64/mm/dump.c:274:102: warning: right shift count >= width of type [-Wshift-count-overflow]

This is because pud_offset(pgd, 0) performs a shift to the right by 36
while the value 0 has the type 'int' by default, therefore 32-bit.

This patch modifies all the p*_offset() uses in arch/arm64/mm/dump.c to
use 0UL for the address argument.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-08-18 12:38:11 +01:00
Jiri Olsa 7b0501b1e7 x86/smp: Fix __max_logical_packages value setup
Frank reported kernel panic when he disabled several cores in BIOS
via following option:

  Core Disable Bitmap(Hex)   [0]

with number 0xFFE, which leaves 16 CPUs in system (out of 48).

The kernel panic below goes along with following messages:

 smpboot: Max logical packages: 2^M
 smpboot: APIC(0) Converting physical 0 to logical package 0^M
 smpboot: APIC(20) Converting physical 1 to logical package 1^M
 smpboot: APIC(40) Package 2 exceeds logical package map^M
 smpboot: CPU 8 APICId 40 disabled^M
 smpboot: APIC(60) Package 3 exceeds logical package map^M
 smpboot: CPU 12 APICId 60 disabled^M
 ...
 general protection fault: 0000 [#1] SMP^M
 Modules linked in:^M
 CPU: 15 PID: 1 Comm: swapper/0 Not tainted 4.7.0-rc5+ #1^M
 Hardware name: SGI UV300/UV300, BIOS SGI UV 300 series BIOS 05/25/2016^M
 task: ffff8801673e0000 ti: ffff8801673ac000 task.ti: ffff8801673ac000^M
 RIP: 0010:[<ffffffff81014d54>]  [<ffffffff81014d54>] uncore_change_context+0xd4/0x180^M
 ...
  [<ffffffff810158ac>] uncore_event_init_cpu+0x6c/0x70^M
  [<ffffffff81d8c91c>] intel_uncore_init+0x1c2/0x2dd^M
  [<ffffffff81d8c75a>] ? uncore_cpu_setup+0x17/0x17^M
  [<ffffffff81002190>] do_one_initcall+0x50/0x190^M
  [<ffffffff810ab193>] ? parse_args+0x293/0x480^M
  [<ffffffff81d87365>] kernel_init_freeable+0x1a5/0x249^M
  [<ffffffff81d86a35>] ? set_debug_rodata+0x12/0x12^M
  [<ffffffff816dc19e>] kernel_init+0xe/0x110^M
  [<ffffffff816e93bf>] ret_from_fork+0x1f/0x40^M
  [<ffffffff816dc190>] ? rest_init+0x80/0x80^M

The reason for the panic is wrong value of __max_logical_packages,
which lets logical_package_map uninitialized and the uncore code
relying on this map being properly initialized (maybe we should
add some safety checks there as well).

The __max_logical_packages is computed as:

  DIV_ROUND_UP(total_cpus, ncpus);
  - ncpus being number of cores

With above BIOS setup we get total_cpus == 16 which set
__max_logical_packages to 2 (ncpus is 12).

Once topology_update_package_map processes CPU with logical
pkg over 2 we display above messages and fail to initialize
the physical_to_logical_pkg map, which makes the uncore code
crash.

The fix is to remove logical_package_map bitmap completely
and keep and update the logical_packages number instead.

After we enumerate all the present CPUs, we check if the
enumerated logical packages count is within its computed
maximum from BIOS data.

If it's not the case, we set this maximum to the new enumerated
value and freeze any new addition of logical packages.

The freeze is because lot of init code like uncore/rapl/cqm
depends on having maximum logical package value set to allocate
their data, so we can't change it later on.

Prarit Bhargava tested the patch and confirms that it solves
the problem:

  From dmidecode:
          Core Count: 24
          Core Enabled: 24
          Thread Count: 48

Orig kernel boot log:

 [    0.464981] smpboot: Max logical packages: 19
 [    0.469861] smpboot: APIC(0) Converting physical 0 to logical package 0
 [    0.477261] smpboot: APIC(40) Converting physical 1 to logical package 1
 [    0.484760] smpboot: APIC(80) Converting physical 2 to logical package 2
 [    0.492258] smpboot: APIC(c0) Converting physical 3 to logical package 3

1.  nr_cpus=8, should stop enumerating in package 0:

 [    0.533664] smpboot: APIC(0) Converting physical 0 to logical package 0
 [    0.539596] smpboot: Max logical packages: 19

2.  max_cpus=8, should still enumerate all packages:

 [    0.526494] smpboot: APIC(0) Converting physical 0 to logical package 0
 [    0.532428] smpboot: APIC(40) Converting physical 1 to logical package 1
 [    0.538456] smpboot: APIC(80) Converting physical 2 to logical package 2
 [    0.544486] smpboot: APIC(c0) Converting physical 3 to logical package 3
 [    0.550524] smpboot: Max logical packages: 19

3.  nr_cpus=49 ( 2 socket + 1 core on 3rd socket), should stop enumerating in
    package 2:

 [    0.521378] smpboot: APIC(0) Converting physical 0 to logical package 0
 [    0.527314] smpboot: APIC(40) Converting physical 1 to logical package 1
 [    0.533345] smpboot: APIC(80) Converting physical 2 to logical package 2
 [    0.539368] smpboot: Max logical packages: 19

4.  maxcpus=49, should still enumerate all packages:

 [    0.525591] smpboot: APIC(0) Converting physical 0 to logical package 0
 [    0.531525] smpboot: APIC(40) Converting physical 1 to logical package 1
 [    0.537547] smpboot: APIC(80) Converting physical 2 to logical package 2
 [    0.543579] smpboot: APIC(c0) Converting physical 3 to logical package 3
 [    0.549624] smpboot: Max logical packages: 19

5.  kdump (nr_cpus=1) works as well.

Reported-by: Frank Ramsay <framsay@redhat.com>
Tested-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: Prarit Bhargava <prarit@redhat.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160815101700.GA30090@krava
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-08-18 10:14:48 +02:00
Borislav Petkov 88b2f63402 x86/microcode/AMD: Fix initrd loading with CONFIG_RANDOMIZE_MEMORY=y
Similar to:

  efaad554b4 ("x86/microcode/intel: Fix initrd loading with CONFIG_RANDOMIZE_MEMORY=y")

... fix microcode loading from the initrd on AMD by adding the
randomization offset to the microcode patch container within the initrd.

Reported-and-tested-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-tip-commits@vger.kernel.org
Link: http://lkml.kernel.org/r/20160817113314.GA19221@nazgul.tnic
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-08-18 10:06:49 +02:00
Rafael J. Wysocki 6c16f42a4e Merge branch 'pm-sleep'
* pm-sleep:
  PM / hibernate: Fix rtree_next_node() to avoid walking off list ends
  x86/power/64: Use __pa() for physical address computation
  PM / sleep: Update some system sleep documentation
2016-08-18 03:27:08 +02:00
Ard Biesheuvel bc9f3d7788 arm64: kernel: avoid literal load of virtual address with MMU off
Literal loads of virtual addresses are subject to runtime relocation when
CONFIG_RELOCATABLE=y, and given that the relocation routines run with the
MMU and caches enabled, literal loads of relocated values performed with
the MMU off are not guaranteed to return the latest value unless the
memory covering the literal is cleaned to the PoC explicitly.

So defer the literal load until after the MMU has been enabled, just like
we do for primary_switch() and secondary_switch() in head.S.

Fixes: 1e48ef7fcc ("arm64: add support for building vmlinux as a relocatable PIE binary")
Cc: <stable@vger.kernel.org> # 4.6+
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-08-17 17:37:37 +01:00
Catalin Marinas bfe6c8a89e arm64: Fix NUMA build error when !CONFIG_ACPI
Since asm/acpi.h is only included by linux/acpi.h when CONFIG_ACPI is
enabled, disabling the latter leads to the following build error on
arm64:

arch/arm64/mm/numa.c: In function ‘arm64_numa_init’:
arch/arm64/mm/numa.c:395:24: error: ‘arm64_acpi_numa_init’ undeclared (first use in this function)
   if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))

This patch include the asm/acpi.h explicitly in arch/arm64/mm/numa.c for
the arm64_acpi_numa_init() definition.

Fixes: d8b47fca8c ("arm64, ACPI, NUMA: NUMA support based on SRAT and SLIT")
Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-08-17 17:16:58 +01:00
Linus Torvalds 45b6ae761e Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 fixes from Martin Schwidefsky:
 "A couple of bug fixes, minor cleanup and a change to the default
  config"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/dasd: fix failing CUIR assignment under LPAR
  s390/pageattr: handle numpages parameter correctly
  s390/dasd: fix hanging device after clear subchannel
  s390/qdio: avoid reschedule of outbound tasklet once killed
  s390/qdio: remove checks for ccw device internal state
  s390/qdio: fix double return code evaluation
  s390/qdio: get rid of spin_lock_irqsave usage
  s390/cio: remove subchannel_id from ccw_device_private
  s390/qdio: obtain subchannel_id via ccw_device_get_schid()
  s390/cio: stop using subchannel_id from ccw_device_private
  s390/config: make the vector optimized crc function builtin
  s390/lib: fix memcmp and strstr
  s390/crc32-vx: Fix checksum calculation for small sizes
  s390: clarify compressed image code path
2016-08-16 15:50:22 -07:00
Rafael J. Wysocki 5d87f493dd x86/power/64: Use __pa() for physical address computation
The value of temp_level4_pgt is the physical address of the
top-level page directory, so use __pa() to compute it.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
2016-08-16 00:39:37 +02:00
Linus Torvalds 4ef870e373 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu
Pull m68knommu fix from Greg Ungerer:
 "This contains only a single fix for a register corruption problem on
  certain types of m68k flat format binaries"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu:
  m68knommu: fix user a5 register being overwritten
2016-08-14 18:54:37 -07:00
Linus Torvalds 118253a593 h8300 and unicore32 architecture fixes
Two patches to fix h8300 and unicore32 builds.
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Merge tag 'fixes-for-linus-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull h8300 and unicore32 architecture fixes from Guenter Roeck:
 "Two patches to fix h8300 and unicore32 builds.

  unicore32 builds have been broken since v4.6.  The fix has been
  available in -next since March of this year.

  h8300 builds have been broken since the last commit window.  The fix
  has been available in -next since June of this year"

* tag 'fixes-for-linus-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  h8300: Add missing include file to asm/io.h
  unicore32: mm: Add missing parameter to arch_vma_access_permitted
2016-08-13 19:39:38 -07:00
Linus Torvalds 120c54751b arm64 fixes:
- Support for nr_cpus= command line argument (maxcpus was previously
   changed to allow secondary CPUs to be hot-plugged)
 
 - ARM PMU interrupt handling fix
 
 - Fix potential TLB conflict in the hibernate code
 
 - Improved handling of EL1 instruction aborts (better error reporting)
 
 - Removal of useless jprobes code for stack saving/restoring
 
 - defconfig updates
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Catalin Marinas:

 - support for nr_cpus= command line argument (maxcpus was previously
   changed to allow secondary CPUs to be hot-plugged)

 - ARM PMU interrupt handling fix

 - fix potential TLB conflict in the hibernate code

 - improved handling of EL1 instruction aborts (better error reporting)

 - removal of useless jprobes code for stack saving/restoring

 - defconfig updates

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: defconfig: enable CONFIG_LOCALVERSION_AUTO
  arm64: defconfig: add options for virtualization and containers
  arm64: hibernate: handle allocation failures
  arm64: hibernate: avoid potential TLB conflict
  arm64: Handle el1 synchronous instruction aborts cleanly
  arm64: Remove stack duplicating code from jprobes
  drivers/perf: arm-pmu: Fix handling of SPI lacking "interrupt-affinity" property
  drivers/perf: arm-pmu: convert arm_pmu_mutex to spinlock
  arm64: Support hard limit of cpu count by nr_cpus
2016-08-13 19:29:46 -07:00
Linus Torvalds 329f415291 KVM locks kvm_device list to prevent corruption on device creation.
PPC splits debugfs initialization from creation of the xics device to
 unlock the newly taken kvm lock earlier.
 
 s390 prevents userspace from triggering two WARN_ON_ONCE.
 
 MIPS fixes several issues in the management of TLB faults (Cc: stable).
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull KVM fixes from Radim Krčmář:
 "KVM:
   - lock kvm_device list to prevent corruption on device creation.

  PPC:
   - split debugfs initialization from creation of the xics device to
     unlock the newly taken kvm lock earlier.

  s390:
   - prevent userspace from triggering two WARN_ON_ONCE.

  MIPS:
   - fix several issues in the management of TLB faults (Cc: stable)"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  MIPS: KVM: Propagate kseg0/mapped tlb fault errors
  MIPS: KVM: Fix gfn range check in kseg0 tlb faults
  MIPS: KVM: Add missing gfn range check
  MIPS: KVM: Fix mapped fault broken commpage handling
  KVM: Protect device ops->create and list_add with kvm->lock
  KVM: PPC: Move xics_debugfs_init out of create
  KVM: s390: reset KVM_REQ_MMU_RELOAD if mapping the prefix failed
  KVM: s390: set the prefix initially properly
2016-08-13 10:11:14 -07:00
Guenter Roeck 2b05980d89 h8300: Add missing include file to asm/io.h
h8300 builds fail with

arch/h8300/include/asm/io.h:9:15: error: unknown type name ‘u8’
arch/h8300/include/asm/io.h:15:15: error: unknown type name ‘u16’
arch/h8300/include/asm/io.h:21:15: error: unknown type name ‘u32’

and many related errors.

Fixes: 23c82d41bdf4 ("kexec-allow-architectures-to-override-boot-mapping-fix")
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2016-08-13 08:53:56 -07:00
Guenter Roeck 783011b130 unicore32: mm: Add missing parameter to arch_vma_access_permitted
unicore32 fails to compile with the following errors.

mm/memory.c: In function ‘__handle_mm_fault’:
mm/memory.c:3381: error:
	too many arguments to function ‘arch_vma_access_permitted’
mm/gup.c: In function ‘check_vma_flags’:
mm/gup.c:456: error:
	too many arguments to function ‘arch_vma_access_permitted’
mm/gup.c: In function ‘vma_permits_fault’:
mm/gup.c:640: error:
	too many arguments to function ‘arch_vma_access_permitted’

Fixes: d61172b4b6 ("mm/core, x86/mm/pkeys: Differentiate instruction fetches")
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
2016-08-13 08:53:18 -07:00
Linus Torvalds 9710cb6624 Power management fixes for v4.8-rc2
- Fix the x86 identity mapping creation helpers to avoid the
    assumption that the base address of the mapping will always be
    aligned at the PGD level, as it may be aligned at the PUD level
    if address space randomization is enabled (Rafael Wysocki).
 
  - Fix the hibernation core to avoid executing tracing functions
    before restoring the processor state completely during resume
    (Thomas Garnier).
 
  - Fix a recently introduced regression in the powernv cpufreq
    driver that causes it to crash due to an out-of-bounds array
    access (Akshay Adiga).
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Merge tag 'pm-4.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "Two hibernation fixes allowing it to work with the recently added
  randomization of the kernel identity mapping base on x86-64 and one
  cpufreq driver regression fix.

  Specifics:

   - Fix the x86 identity mapping creation helpers to avoid the
     assumption that the base address of the mapping will always be
     aligned at the PGD level, as it may be aligned at the PUD level if
     address space randomization is enabled (Rafael Wysocki).

   - Fix the hibernation core to avoid executing tracing functions
     before restoring the processor state completely during resume
     (Thomas Garnier).

   - Fix a recently introduced regression in the powernv cpufreq driver
     that causes it to crash due to an out-of-bounds array access
     (Akshay Adiga)"

* tag 'pm-4.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM / hibernate: Restore processor state before using per-CPU variables
  x86/power/64: Always create temporary identity mapping correctly
  cpufreq: powernv: Fix crash in gpstate_timer_handler()
2016-08-12 16:23:58 -07:00
Linus Torvalds 01ea443982 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
 "This is bigger than usual - the reason is partly a pent-up stream of
  fixes after the merge window and partly accidental.  The fixes are:

   - five patches to fix a boot failure on Andy Lutomirsky's laptop
   - four SGI UV platform fixes
   - KASAN fix
   - warning fix
   - documentation update
   - swap entry definition fix
   - pkeys fix
   - irq stats fix"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/apic/x2apic, smp/hotplug: Don't use before alloc in x2apic_cluster_probe()
  x86/efi: Allocate a trampoline if needed in efi_free_boot_services()
  x86/boot: Rework reserve_real_mode() to allow multiple tries
  x86/boot: Defer setup_real_mode() to early_initcall time
  x86/boot: Synchronize trampoline_cr4_features and mmu_cr4_features directly
  x86/boot: Run reserve_bios_regions() after we initialize the memory map
  x86/irq: Do not substract irq_tlb_count from irq_call_count
  x86/mm: Fix swap entry comment and macro
  x86/mm/kaslr: Fix -Wformat-security warning
  x86/mm/pkeys: Fix compact mode by removing protection keys' XSAVE buffer manipulation
  x86/build: Reduce the W=1 warnings noise when compiling x86 syscall tables
  x86/platform/UV: Fix kernel panic running RHEL kdump kernel on UV systems
  x86/platform/UV: Fix problem with UV4 BIOS providing incorrect PXM values
  x86/platform/UV: Fix bug with iounmap() of the UV4 EFI System Table causing a crash
  x86/platform/UV: Fix problem with UV4 Socket IDs not being contiguous
  x86/entry: Clarify the RF saving/restoring situation with SYSCALL/SYSRET
  x86/mm: Disable preemption during CR3 read+write
  x86/mm/KASLR: Increase BRK pages for KASLR memory randomization
  x86/mm/KASLR: Fix physical memory calculation on KASLR memory randomization
  x86, kasan, ftrace: Put APIC interrupt handlers into .irqentry.text
2016-08-12 14:31:10 -07:00
Linus Torvalds 3bc6d8c155 Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fixes from Ingo Molnar:
 "Misc fixes: a /dev/rtc regression fix, two APIC timer period
  calibration fixes, an ARM clocksource driver fix and a NOHZ
  power use regression fix"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/hpet: Fix /dev/rtc breakage caused by RTC cleanup
  x86/timers/apic: Inform TSC deadline clockevent device about recalibration
  x86/timers/apic: Fix imprecise timer interrupts by eliminating TSC clockevents frequency roundoff error
  timers: Fix get_next_timer_interrupt() computation
  clocksource/arm_arch_timer: Force per-CPU interrupt to be level-triggered
2016-08-12 13:55:06 -07:00
Rafael J. Wysocki 0aeeb3e73f Merge branches 'pm-sleep' and 'pm-cpufreq'
* pm-sleep:
  PM / hibernate: Restore processor state before using per-CPU variables
  x86/power/64: Always create temporary identity mapping correctly

* pm-cpufreq:
  cpufreq: powernv: Fix crash in gpstate_timer_handler()
2016-08-12 22:53:58 +02:00
Linus Torvalds ad83242a8f Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Ingo Molnar:
 "Mostly tooling fixes, plus two uncore-PMU fixes, an uprobes fix, a
  perf-cgroups fix and an AUX events fix"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel/uncore: Add enable_box for client MSR uncore
  perf/x86/intel/uncore: Fix uncore num_counters
  uprobes/x86: Fix RIP-relative handling of EVEX-encoded instructions
  perf/core: Set cgroup in CPU contexts for new cgroup events
  perf/core: Fix sideband list-iteration vs. event ordering NULL pointer deference crash
  perf probe ppc64le: Fix probe location when using DWARF
  perf probe: Add function to post process kernel trace events
  tools: Sync cpufeatures headers with the kernel
  toops: Sync tools/include/uapi/linux/bpf.h with the kernel
  tools: Sync cpufeatures.h and vmx.h with the kernel
  perf probe: Support signedness casting
  perf stat: Avoid skew when reading events
  perf probe: Fix module name matching
  perf probe: Adjust map->reloc offset when finding kernel symbol from map
  perf hists: Trim libtraceevent trace_seq buffers
  perf script: Add 'bpf-output' field to usage message
2016-08-12 13:21:18 -07:00
Linus Torvalds 0e1117b257 Merge branch 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull EFI fixes from Ingo Molnar:
 "A fix for EFI capsules and an SGI UV platform fix"

* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi/capsule: Allocate whole capsule into virtual memory
  x86/platform/uv: Skip UV runtime services mapping in the efi_runtime_disabled case
2016-08-12 12:39:02 -07:00
Linus Torvalds 8766dc68d1 powerpc fixes for 4.8 #3
- powerpc/vdso: Fix build rules to rebuild vdsos correctly from Nicholas Piggin
  - powerpc/ptrace: Fix coredump since ptrace TM changes from Cyril Bur
  - powerpc/32: Fix csum_partial_copy_generic() from Christophe Leroy
  - cxl: Set psl_fir_cntl to production environment value from Frederic Barrat
  - powerpc/eeh: Switch to conventional PCI address output in EEH log from Guilherme G. Piccoli
  - cxl: Use fixed width predefined types in data structure. from Philippe Bergheaud
  - powerpc/vdso: Add missing include file from Guenter Roeck
  - powerpc: Fix unused function warning 'lmb_to_memblock' from Alastair D'Silva
  - powerpc/powernv/ioda: Fix TCE invalidate to work in real mode again from Alexey Kardashevskiy
  - powerpc/cell: Add missing error code in spufs_mkgang() from Dan Carpenter
  - crypto: crc32c-vpmsum - Convert to CPU feature based module autoloading from Anton Blanchard
  - powerpc/pasemi: Fix coherent_dma_mask for dma engine from Darren Stevens
 
 Benjamin Herrenschmidt:
  - powerpc/32: Fix crash during static key init
  - powerpc: Update obsolete comment in setup_32.c about early_init()
  - powerpc: Print the kernel load address at the end of prom_init()
  - powerpc/pnv/pci: Fix incorrect PE reservation attempt on some 64-bit BARs
  - powerpc/xics: Properly set Edge/Level type and enable resend
 
 Mahesh Salgaonkar:
  - powerpc/book3s: Fix MCE console messages for unrecoverable MCE.
  - powerpc/powernv: Fix MCE handler to avoid trashing CR0/CR1 registers.
  - powerpc/powernv: Move IDLE_STATE_ENTER_SEQ macro to cpuidle.h
  - powerpc/powernv: Load correct TOC pointer while waking up from winkle.
 
 Andrew Donnellan:
  - cxl: Fix sparse warnings
  - cxl: Fix NULL dereference in cxl_context_init() on PowerVM guests
 
 Michael Ellerman:
  - selftests/powerpc: Specify we expect to build with std=gnu99
  - powerpc/Makefile: Use cflags-y/aflags-y for setting endian options
  - powerpc/pci: Fix endian bug in fixed PHB numbering
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Merge tag 'powerpc-4.8-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "Some powerpc fixes for 4.8:

  Misc:
   - powerpc/vdso: Fix build rules to rebuild vdsos correctly from Nicholas Piggin
   - powerpc/ptrace: Fix coredump since ptrace TM changes from Cyril Bur
   - powerpc/32: Fix csum_partial_copy_generic() from Christophe Leroy
   - cxl: Set psl_fir_cntl to production environment value from Frederic Barrat
   - powerpc/eeh: Switch to conventional PCI address output in EEH log from Guilherme G. Piccoli
   - cxl: Use fixed width predefined types in data structure. from Philippe Bergheaud
   - powerpc/vdso: Add missing include file from Guenter Roeck
   - powerpc: Fix unused function warning 'lmb_to_memblock' from Alastair D'Silva
   - powerpc/powernv/ioda: Fix TCE invalidate to work in real mode again from Alexey Kardashevskiy
   - powerpc/cell: Add missing error code in spufs_mkgang() from Dan Carpenter
   - crypto: crc32c-vpmsum - Convert to CPU feature based module autoloading from Anton Blanchard
   - powerpc/pasemi: Fix coherent_dma_mask for dma engine from Darren Stevens

  Benjamin Herrenschmidt:
   - powerpc/32: Fix crash during static key init
   - powerpc: Update obsolete comment in setup_32.c about early_init()
   - powerpc: Print the kernel load address at the end of prom_init()
   - powerpc/pnv/pci: Fix incorrect PE reservation attempt on some 64-bit BARs
   - powerpc/xics: Properly set Edge/Level type and enable resend

  Mahesh Salgaonkar:
   - powerpc/book3s: Fix MCE console messages for unrecoverable MCE.
   - powerpc/powernv: Fix MCE handler to avoid trashing CR0/CR1 registers.
   - powerpc/powernv: Move IDLE_STATE_ENTER_SEQ macro to cpuidle.h
   - powerpc/powernv: Load correct TOC pointer while waking up from winkle.

  Andrew Donnellan:
   - cxl: Fix sparse warnings
   - cxl: Fix NULL dereference in cxl_context_init() on PowerVM guests

  Michael Ellerman:
   - selftests/powerpc: Specify we expect to build with std=gnu99
   - powerpc/Makefile: Use cflags-y/aflags-y for setting endian options
   - powerpc/pci: Fix endian bug in fixed PHB numbering"

* tag 'powerpc-4.8-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (26 commits)
  selftests/powerpc: Specify we expect to build with std=gnu99
  powerpc/vdso: Fix build rules to rebuild vdsos correctly
  powerpc/Makefile: Use cflags-y/aflags-y for setting endian options
  powerpc/32: Fix crash during static key init
  powerpc: Update obsolete comment in setup_32.c about early_init()
  powerpc: Print the kernel load address at the end of prom_init()
  powerpc/ptrace: Fix coredump since ptrace TM changes
  powerpc/32: Fix csum_partial_copy_generic()
  cxl: Set psl_fir_cntl to production environment value
  powerpc/pnv/pci: Fix incorrect PE reservation attempt on some 64-bit BARs
  powerpc/book3s: Fix MCE console messages for unrecoverable MCE.
  powerpc/pci: Fix endian bug in fixed PHB numbering
  powerpc/eeh: Switch to conventional PCI address output in EEH log
  cxl: Fix sparse warnings
  cxl: Fix NULL dereference in cxl_context_init() on PowerVM guests
  cxl: Use fixed width predefined types in data structure.
  powerpc/vdso: Add missing include file
  powerpc: Fix unused function warning 'lmb_to_memblock'
  powerpc/powernv: Fix MCE handler to avoid trashing CR0/CR1 registers.
  powerpc/powernv: Move IDLE_STATE_ENTER_SEQ macro to cpuidle.h
  ...
2016-08-12 12:09:44 -07:00
Masahiro Yamada 53fb45d3df arm64: defconfig: enable CONFIG_LOCALVERSION_AUTO
When CONFIG_LOCALVERSION_AUTO is disabled, the version string is
just a tag name (or with a '+' appended if HEAD is not a tagged
commit).

During the development (and especially when git-bisecting), longer
version string would be helpful to identify the commit we are running.

This is a default y option, so drop the unset to enable it.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-08-12 19:08:48 +01:00
Riku Voipio 2323439fd0 arm64: defconfig: add options for virtualization and containers
Enable options commonly needed by popular virtualization
and container applications. Use modules when possible to
avoid too much overhead for users not interested.

- add namespace and cgroup options needed
- add seccomp - optional, but enhances Qemu etc
- bridge, nat, veth, macvtap and multicast for routing
  guests and containers
- btfrs and overlayfs modules for container COW backends
- while near it, make fuse a module instead of built-in.

Generated with make saveconfig and dropping unrelated spurious
change hunks while commiting. bloat-o-meter old-vmlinux vmlinux:

add/remove: 905/390 grow/shrink: 767/229 up/down: 183513/-94861 (88652)
....
Total: Before=10515408, After=10604060, chg +0.84%

Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-08-12 19:08:47 +01:00
Mark Rutland dfbca61af0 arm64: hibernate: handle allocation failures
In create_safe_exec_page(), we create a copy of the hibernate exit text,
along with some page tables to map this via TTBR0. We then install the
new tables in TTBR0.

In swsusp_arch_resume() we call create_safe_exec_page() before trying a
number of operations which may fail (e.g. copying the linear map page
tables). If these fail, we bail out of swsusp_arch_resume() and return
an error code, but leave TTBR0 as-is. Subsequently, the core hibernate
code will call free_basic_memory_bitmaps(), which will free all of the
memory allocations we made, including the page tables installed in
TTBR0.

Thus, we may have TTBR0 pointing at dangling freed memory for some
period of time. If the hibernate attempt was triggered by a user
requesting a hibernate test via the reboot syscall, we may return to
userspace with the clobbered TTBR0 value.

Avoid these issues by reorganising swsusp_arch_resume() such that we
have no failure paths after create_safe_exec_page(). We also add a check
that the zero page allocation succeeded, matching what we have for other
allocations.

Fixes: 82869ac57b ("arm64: kernel: Add support for hibernate/suspend-to-disk")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: James Morse <james.morse@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: <stable@vger.kernel.org> # 4.7+
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-08-12 19:08:33 +01:00
Mark Rutland 0194e760f7 arm64: hibernate: avoid potential TLB conflict
In create_safe_exec_page we install a set of global mappings in TTBR0,
then subsequently invalidate TLBs. While TTBR0 points at the zero page,
and the TLBs should be free of stale global entries, we may have stale
ASID-tagged entries (e.g. from the EFI runtime services mappings) for
the same VAs. Per the ARM ARM these ASID-tagged entries may conflict
with newly-allocated global entries, and we must follow a
Break-Before-Make approach to avoid issues resulting from this.

This patch reworks create_safe_exec_page to invalidate TLBs while the
zero page is still in place, ensuring that there are no potential
conflicts when the new TTBR0 value is installed. As a single CPU is
online while this code executes, we do not need to perform broadcast TLB
maintenance, and can call local_flush_tlb_all(), which also subsumes
some barriers. The remaining assembly is converted to use write_sysreg()
and isb().

Other than this, we safely manipulate TTBRs in the hibernate dance. The
code we install as part of the new TTBR0 mapping (the hibernated
kernel's swsusp_arch_suspend_exit) installs a zero page into TTBR1,
invalidates TLBs, then installs its preferred value. Upon being restored
to the middle of swsusp_arch_suspend, the new image will call
__cpu_suspend_exit, which will call cpu_uninstall_idmap, installing the
zero page in TTBR0 and invalidating all TLB entries.

Fixes: 82869ac57b ("arm64: kernel: Add support for hibernate/suspend-to-disk")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: James Morse <james.morse@arm.com>
Tested-by: James Morse <james.morse@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: <stable@vger.kernel.org> # 4.7+
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-08-12 18:46:29 +01:00
Laura Abbott 9adeb8e72d arm64: Handle el1 synchronous instruction aborts cleanly
Executing from a non-executable area gives an ugly message:

lkdtm: Performing direct entry EXEC_RODATA
lkdtm: attempting ok execution at ffff0000084c0e08
lkdtm: attempting bad execution at ffff000008880700
Bad mode in Synchronous Abort handler detected on CPU2, code 0x8400000e -- IABT (current EL)
CPU: 2 PID: 998 Comm: sh Not tainted 4.7.0-rc2+ #13
Hardware name: linux,dummy-virt (DT)
task: ffff800077e35780 ti: ffff800077970000 task.ti: ffff800077970000
PC is at lkdtm_rodata_do_nothing+0x0/0x8
LR is at execute_location+0x74/0x88

The 'IABT (current EL)' indicates the error but it's a bit cryptic
without knowledge of the ARM ARM. There is also no indication of the
specific address which triggered the fault. The increase in kernel
page permissions makes hitting this case more likely as well.
Handling the case in the vectors gives a much more familiar looking
error message:

lkdtm: Performing direct entry EXEC_RODATA
lkdtm: attempting ok execution at ffff0000084c0840
lkdtm: attempting bad execution at ffff000008880680
Unable to handle kernel paging request at virtual address ffff000008880680
pgd = ffff8000089b2000
[ffff000008880680] *pgd=00000000489b4003, *pud=0000000048904003, *pmd=0000000000000000
Internal error: Oops: 8400000e [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 997 Comm: sh Not tainted 4.7.0-rc1+ #24
Hardware name: linux,dummy-virt (DT)
task: ffff800077f9f080 ti: ffff800008a1c000 task.ti: ffff800008a1c000
PC is at lkdtm_rodata_do_nothing+0x0/0x8
LR is at execute_location+0x74/0x88

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-08-12 17:58:48 +01:00
Radim Krčmář 89a1d43ead KVM: s390: Fixes for 4.8 (via kvm/master)
Here are two fixes found by fuzzing of the ioctl interface.
 Both cases can trigger a WARN_ON_ONCE from user space.
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Merge tag 'kvm-s390-master-4.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux

KVM: s390: Fixes for 4.8 (via kvm/master)

Here are two fixes found by fuzzing of the ioctl interface.
Both cases can trigger a WARN_ON_ONCE from user space.
2016-08-12 12:01:51 +02:00
James Hogan 9b731bcfde MIPS: KVM: Propagate kseg0/mapped tlb fault errors
Propagate errors from kvm_mips_handle_kseg0_tlb_fault() and
kvm_mips_handle_mapped_seg_tlb_fault(), usually triggering an internal
error since they normally indicate the guest accessed bad physical
memory or the commpage in an unexpected way.

Fixes: 858dd5d457 ("KVM/MIPS32: MMU/TLB operations for the Guest.")
Fixes: e685c689f3 ("KVM/MIPS32: Privileged instruction/target branch emulation.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Cc: <stable@vger.kernel.org> # 3.10.x-
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2016-08-12 12:01:30 +02:00
James Hogan 0741f52d1b MIPS: KVM: Fix gfn range check in kseg0 tlb faults
Two consecutive gfns are loaded into host TLB, so ensure the range check
isn't off by one if guest_pmap_npages is odd.

Fixes: 858dd5d457 ("KVM/MIPS32: MMU/TLB operations for the Guest.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Cc: <stable@vger.kernel.org> # 3.10.x-
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2016-08-12 12:01:29 +02:00
James Hogan 8985d50382 MIPS: KVM: Add missing gfn range check
kvm_mips_handle_mapped_seg_tlb_fault() calculates the guest frame number
based on the guest TLB EntryLo values, however it is not range checked
to ensure it lies within the guest_pmap. If the physical memory the
guest refers to is out of range then dump the guest TLB and emit an
internal error.

Fixes: 858dd5d457 ("KVM/MIPS32: MMU/TLB operations for the Guest.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Cc: <stable@vger.kernel.org> # 3.10.x-
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2016-08-12 12:01:28 +02:00
James Hogan c604cffa93 MIPS: KVM: Fix mapped fault broken commpage handling
kvm_mips_handle_mapped_seg_tlb_fault() appears to map the guest page at
virtual address 0 to PFN 0 if the guest has created its own mapping
there. The intention is unclear, but it may have been an attempt to
protect the zero page from being mapped to anything but the comm page in
code paths you wouldn't expect from genuine commpage accesses (guest
kernel mode cache instructions on that address, hitting trapping
instructions when executing from that address with a coincidental TLB
eviction during the KVM handling, and guest user mode accesses to that
address).

Fix this to check for mappings exactly at KVM_GUEST_COMMPAGE_ADDR (it
may not be at address 0 since commit 42aa12e74e ("MIPS: KVM: Move
commpage so 0x0 is unmapped")), and set the corresponding EntryLo to be
interpreted as 0 (invalid).

Fixes: 858dd5d457 ("KVM/MIPS32: MMU/TLB operations for the Guest.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Cc: <stable@vger.kernel.org> # 3.10.x-
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2016-08-12 12:01:28 +02:00
Christoffer Dall a28ebea2ad KVM: Protect device ops->create and list_add with kvm->lock
KVM devices were manipulating list data structures without any form of
synchronization, and some implementations of the create operations also
suffered from a lack of synchronization.

Now when we've split the xics create operation into create and init, we
can hold the kvm->lock mutex while calling the create operation and when
manipulating the devices list.

The error path in the generic code gets slightly ugly because we have to
take the mutex again and delete the device from the list, but holding
the mutex during anon_inode_getfd or releasing/locking the mutex in the
common non-error path seemed wrong.

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2016-08-12 12:01:27 +02:00
Christoffer Dall 023e9fddc3 KVM: PPC: Move xics_debugfs_init out of create
As we are about to hold the kvm->lock during the create operation on KVM
devices, we should move the call to xics_debugfs_init into its own
function, since holding a mutex over extended amounts of time might not
be a good idea.

Introduce an init operation on the kvm_device_ops struct which cannot
fail and call this, if configured, after the device has been created.

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2016-08-12 12:01:26 +02:00
Julius Niedworok aca411a4b1 KVM: s390: reset KVM_REQ_MMU_RELOAD if mapping the prefix failed
When triggering KVM_RUN without a user memory region being mapped
(KVM_SET_USER_MEMORY_REGION) a validity intercept occurs. This could
happen, if the user memory region was not mapped initially or if it
was unmapped after the vcpu is initialized. The function
kvm_s390_handle_requests checks for the KVM_REQ_MMU_RELOAD bit. The
check function always clears this bit. If gmap_mprotect_notify
returns an error code, the mapping failed, but the KVM_REQ_MMU_RELOAD
was not set anymore. So the next time kvm_s390_handle_requests is
called, the execution would fall trough the check for
KVM_REQ_MMU_RELOAD. The bit needs to be resetted, if
gmap_mprotect_notify returns an error code. Resetting the bit with
kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu) fixes the bug.

Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Julius Niedworok <jniedwor@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2016-08-12 09:11:08 +02:00
Julius Niedworok 75a4615c95 KVM: s390: set the prefix initially properly
When KVM_RUN is triggered on a VCPU without an initial reset, a
validity intercept occurs.
Setting the prefix will set the KVM_REQ_MMU_RELOAD bit initially,
thus preventing the bug.

Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Julius Niedworok <jniedwor@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2016-08-12 09:10:17 +02:00
Kan Liang 95f3be7984 perf/x86/intel/uncore: Add enable_box for client MSR uncore
There are bug reports about miscounting uncore counters on some
client machines like Sandybridge, Broadwell and Skylake. It is
very likely to be observed on idle systems.

This issue is caused by a hardware issue. PERF_GLOBAL_CTL could be
cleared after Package C7, and nothing will be count.
The related errata (HSD 158) could be found in:

  www.intel.com/content/dam/www/public/us/en/documents/specification-updates/4th-gen-core-family-desktop-specification-update.pdf

This patch tries to work around this issue by re-enabling PERF_GLOBAL_CTL
in ->enable_box(). The workaround does not cover all cases. It helps for new
events after returning from C7. But it cannot prevent C7, it will still
miscount if a counter is already active.

There is no drawback in leaving it enabled, so it does not need
disable_box() here.

Signed-off-by: Kan Liang <kan.liang@intel.com>
Cc: <stable@vger.kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/1470925874-59943-1-git-send-email-kan.liang@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-08-12 08:35:05 +02:00