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  1. 24 6月, 2018 1 次提交
    • L
      Merge tag 'trace-v4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace · 81f9c4e4
      由 Linus Torvalds 提交于 
      Pull tracing fixes from Steven Rostedt:
 "This contains a few fixes and a clean up.

   - a bad merge caused an "endif" to go in the wrong place in
     scripts/Makefile.build

   - softirq tracing fix for tracing that corrupts lockdep and causes a
     false splat

   - histogram documentation typo fixes

   - fix a bad memory reference when passing in no filter to the filter
     code

   - simplify code by using the swap macro instead of open coding the
     swap"

* tag 'trace-v4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Fix SKIP_STACK_VALIDATION=1 build due to bad merge with -mrecord-mcount
  tracing: Fix some errors in histogram documentation
  tracing: Use swap macro in update_max_tr
  softirq: Reorder trace_softirqs_on to prevent lockdep splat
  tracing: Check for no filter when processing event filters
      81f9c4e4
  3. 23 6月, 2018 6 次提交
    • L
      Merge tag 'powerpc-4.18-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · 5e220483
      由 Linus Torvalds 提交于 
      Pull powerpc fixes from Michael Ellerman:

 - a fix for hugetlb with 4K pages, broken by our recent changes for
   split PMD PTL.

 - set the correct assembler machine type on e500mc, needed since
   binutils 2.26 introduced two forms for the "wait" instruction.

 - a fix for potential missed TLB flushes with MADV_[FREE|DONTNEED] etc.
   and THP on Power9 Radix.

 - three fixes to try and make our panic handling more robust by hard
   disabling interrupts, and not marking stopped CPUs as offline because
   they haven't been properly offlined.

 - three other minor fixes.

Thanks to: Aneesh Kumar K.V, Michael Jeanson, Nicholas Piggin.

* tag 'powerpc-4.18-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/mm/hash/4k: Free hugetlb page table caches correctly.
  powerpc/64s/radix: Fix radix_kvm_prefetch_workaround paca access of not possible CPU
  powerpc/64s: Fix build failures with CONFIG_NMI_IPI=n
  powerpc/64: hard disable irqs on the panic()ing CPU
  powerpc: smp_send_stop do not offline stopped CPUs
  powerpc/64: hard disable irqs in panic_smp_self_stop
  powerpc/64s: Fix DT CPU features Power9 DD2.1 logic
  powerpc/64s/radix: Fix MADV_[FREE|DONTNEED] TLB flush miss problem with THP
  powerpc/e500mc: Set assembler machine type to e500mc
      5e220483
    • L
      Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux · 7ab366e4
      由 Linus Torvalds 提交于 
      Pull arm64 fixes from Catalin Marinas:

 - clear buffers allocated with FORCE_CONTIGUOUS explicitly until the
   CMA code honours __GFP_ZERO

 - notrace annotation for secondary_start_kernel()

 - use early_param() instead of __setup() for "kpti=" as it is needed
   for the cpufeature callback remapping swapper to non-global mappings

 - ensure writes to swapper are ordered wrt subsequent cache maintenance
   in the kpti non-global remapping code

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: mm: Ensure writes to swapper are ordered wrt subsequent cache maintenance
  arm64: kpti: Use early_param for kpti= command-line option
  arm64: make secondary_start_kernel() notrace
  arm64: dma-mapping: clear buffers allocated with FORCE_CONTIGUOUS flag
      7ab366e4
    • L
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm · 8b88ed3c
      由 Linus Torvalds 提交于 
      Pull KVM fixes from Radim Krčmář:
 "ARM:
   - Lazy FPSIMD switching fixes
   - Really disable compat ioctls on architectures that don't want it
   - Disable compat on arm64 (it was never implemented...)
   - Rely on architectural requirements for GICV on GICv3
   - Detect bad alignments in unmap_stage2_range

  x86:
   - Add nested VM entry checks to avoid broken error recovery path
   - Minor documentation fix"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: fix KVM_CAP_HYPERV_TLBFLUSH paragraph number
  kvm: vmx: Nested VM-entry prereqs for event inj.
  KVM: arm64: Prevent KVM_COMPAT from being selected
  KVM: Enforce error in ioctl for compat tasks when !KVM_COMPAT
  KVM: arm/arm64: add WARN_ON if size is not PAGE_SIZE aligned in unmap_stage2_range
  KVM: arm64: Avoid mistaken attempts to save SVE state for vcpus
  KVM: arm64/sve: Fix SVE trap restoration for non-current tasks
  KVM: arm64: Don't mask softirq with IRQs disabled in vcpu_put()
  arm64: Introduce sysreg_clear_set()
  KVM: arm/arm64: Drop resource size check for GICV window
      8b88ed3c
    • L
      Merge tag 'for-linus-4.18-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip · 4ab59fcf
      由 Linus Torvalds 提交于 
      Pull xen fixes from Juergen Gross:
 "This contains the following fixes/cleanups:

   - the removal of a BUG_ON() which wasn't necessary and which could
     trigger now due to a recent change

   - a correction of a long standing bug happening very rarely in Xen
     dom0 when a hypercall buffer from user land was not accessible by
     the hypervisor for very short periods of time due to e.g. page
     migration or compaction

   - usage of EXPORT_SYMBOL_GPL() instead of EXPORT_SYMBOL() in a
     Xen-related driver (no breakage possible as using those symbols
     without others already exported via EXPORT-SYMBOL_GPL() wouldn't
     make any sense)

   - a simplification for Xen PVH or Xen ARM guests

   - some additional error handling for callers of xenbus_printf()"

* tag 'for-linus-4.18-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen: Remove unnecessary BUG_ON from __unbind_from_irq()
  xen: add new hypercall buffer mapping device
  xen/scsiback: add error handling for xenbus_printf
  scsi: xen-scsifront: add error handling for xenbus_printf
  xen/grant-table: Export gnttab_{alloc|free}_pages as GPL
  xen: add error handling for xenbus_printf
  xen: share start flags between PV and PVH
      4ab59fcf
    • W
      arm64: mm: Ensure writes to swapper are ordered wrt subsequent cache maintenance · 71c8fc0c
      由 Will Deacon 提交于 
      When rewriting swapper using nG mappings, we must performance cache
maintenance around each page table access in order to avoid coherency
problems with the host's cacheable alias under KVM. To ensure correct
ordering of the maintenance with respect to Device memory accesses made
with the Stage-1 MMU disabled, DMBs need to be added between the
maintenance and the corresponding memory access.

This patch adds a missing DMB between writing a new page table entry and
performing a clean+invalidate on the same line.

Fixes: f992b4df ("arm64: kpti: Add ->enable callback to remap swapper using nG mappings")
Cc: <stable@vger.kernel.org> # 4.16.x-
Acked-by: NMark Rutland <mark.rutland@arm.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
      71c8fc0c
    • W
      arm64: kpti: Use early_param for kpti= command-line option · b5b7dd64
      由 Will Deacon 提交于 
      We inspect __kpti_forced early on as part of the cpufeature enable
callback which remaps the swapper page table using non-global entries.

Ensure that __kpti_forced has been updated to reflect the kpti=
command-line option before we start using it.

Fixes: ea1e3de8 ("arm64: entry: Add fake CPU feature for unmapping the kernel at EL0")
Cc: <stable@vger.kernel.org> # 4.16.x-
Reported-by: NWei Xu <xuwei5@hisilicon.com>
Tested-by: NSudeep Holla <sudeep.holla@arm.com>
Tested-by: NWei Xu <xuwei5@hisilicon.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
      b5b7dd64
  5. 22 6月, 2018 21 次提交
  7. 21 6月, 2018 12 次提交
    • R
      Merge branches 'acpi-soc' and 'acpi-processor' · e50f182c
      由 Rafael J. Wysocki 提交于 
      These are a stable-candidate suspend/resume fix of the ACPI driver for
Intel SoCs (LPSS) and an inline stub fix for the ACPI processor driver.

* acpi-soc:
  ACPI / LPSS: Avoid PM quirks on suspend and resume from S3

* acpi-processor:
  ACPI / processor: Finish making acpi_processor_ppc_has_changed() void
      e50f182c
    • R
      Merge branch 'pm-tools' · b51e0013
      由 Rafael J. Wysocki 提交于 
      These are turbostat utility updates for 4.18-rc2 including two fixes
for recent regressions and some minor extensions.

* pm-tools:
  tools/power turbostat: version 18.06.20
  tools/power turbostat: add the missing command line switches
  tools/power turbostat: add single character tokens to help
  tools/power turbostat: alphabetize the help output
  tools/power turbostat: fix segfault on 'no node' machines
  tools/power turbostat: add optional APIC X2APIC columns
  tools/power turbostat: decode cpuid.1.HT
  tools/power turbostat: fix show/hide issues resulting from mis-merge
      b51e0013
    • R
      Merge branches 'pm-core' and 'pm-opp' · 7553a72b
      由 Rafael J. Wysocki 提交于 
      These are a PM core fix and an OPP framework fix for 4.18-rc2,
both "stable" material.

* pm-core:
  PM / core: Fix supplier device runtime PM usage counter imbalance

* pm-opp:
  PM / OPP: Update voltage in case freq == old_freq
      7553a72b
    • J
      KVM: arm/arm64: add WARN_ON if size is not PAGE_SIZE aligned in unmap_stage2_range · 47a91b72
      由 Jia He 提交于 
      There is a panic in armv8a server(QDF2400) under memory pressure tests
(start 20 guests and run memhog in the host).

---------------------------------begin--------------------------------
[35380.800950] BUG: Bad page state in process qemu-kvm  pfn:dd0b6
[35380.805825] page:ffff7fe003742d80 count:-4871 mapcount:-2126053375
mapping:          (null) index:0x0
[35380.815024] flags: 0x1fffc00000000000()
[35380.818845] raw: 1fffc00000000000 0000000000000000 0000000000000000
ffffecf981470000
[35380.826569] raw: dead000000000100 dead000000000200 ffff8017c001c000
0000000000000000
[35380.805825] page:ffff7fe003742d80 count:-4871 mapcount:-2126053375
mapping:          (null) index:0x0
[35380.815024] flags: 0x1fffc00000000000()
[35380.818845] raw: 1fffc00000000000 0000000000000000 0000000000000000
ffffecf981470000
[35380.826569] raw: dead000000000100 dead000000000200 ffff8017c001c000
0000000000000000
[35380.834294] page dumped because: nonzero _refcount
[...]
--------------------------------end--------------------------------------

The root cause might be what was fixed at [1]. But from the KVM points of
view, it would be better if the issue was caught earlier.

If the size is not PAGE_SIZE aligned, unmap_stage2_range might unmap the
wrong(more or less) page range. Hence it caused the "BUG: Bad page
state"

Let's WARN in that case, so that the issue is obvious.

[1] https://lkml.org/lkml/2018/5/3/1042Reviewed-by: NSuzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: jia.he@hxt-semitech.com
[maz: tidied up commit message]
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
      47a91b72
    • M
      drm/bridge/sii8620: fix display of packed pixel modes in MHL2 · e8b92efa
      由 Maciej Purski 提交于 
      Currently packed pixel modes in MHL2 can't be displayed. The device
automatically recognizes output format, so setting format other than
RGB causes failure. Fix it by writing proper values to registers.

Tested on MHL1 and MHL2 using various vendors' dongles both in
DVI and HDMI mode.
Signed-off-by: NMaciej Purski <m.purski@samsung.com>
Signed-off-by: NAndrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1516706239-9104-1-git-send-email-m.purski@samsung.com
      e8b92efa
    • D
      KVM: arm64: Avoid mistaken attempts to save SVE state for vcpus · 2955bcc8
      由 Dave Martin 提交于 
      Commit e6b673b7 ("KVM: arm64: Optimise FPSIMD handling to reduce
guest/host thrashing") uses fpsimd_save() to save the FPSIMD state
for a vcpu when scheduling the vcpu out.  However, currently
current's value of TIF_SVE is restored before calling fpsimd_save()
which means that fpsimd_save() may erroneously attempt to save SVE
state from the vcpu.  This enables current's vector state to be
polluted with guest data.  current->thread.sve_state may be
unallocated or not large enough, so this can also trigger a NULL
dereference or buffer overrun.

Instead of this, TIF_SVE should be configured properly for the
guest when calling fpsimd_save() with the vcpu context loaded.

This patch ensures this by delaying restoration of current's
TIF_SVE until after the call to fpsimd_save().

Fixes: e6b673b7 ("KVM: arm64: Optimise FPSIMD handling to reduce guest/host thrashing")
Signed-off-by: NDave Martin <Dave.Martin@arm.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
      2955bcc8
    • D
      KVM: arm64/sve: Fix SVE trap restoration for non-current tasks · b3eb56b6
      由 Dave Martin 提交于 
      Commit e6b673b7 ("KVM: arm64: Optimise FPSIMD handling to reduce
guest/host thrashing") attempts to restore the configuration of
userspace SVE trapping via a call to fpsimd_bind_task_to_cpu(), but
the logic for determining when to do this is not correct.

The patch makes the errnoenous assumption that the only task that
may try to enter userspace with the currently loaded FPSIMD/SVE
register content is current.  This may not be the case however:  if
some other user task T is scheduled on the CPU during the execution
of the KVM run loop, and the vcpu does not try to use the registers
in the meantime, then T's state may be left there intact.  If T
happens to be the next task to enter userspace on this CPU then the
hooks for reloading the register state and configuring traps will
be skipped.

(Also, current never has SVE state at this point anyway and should
always have the trap enabled, as a side-effect of the ioctl()
syscall needed to reach the KVM run loop in the first place.)

This patch instead restores the state of the EL0 trap from the
state observed at the most recent vcpu_load(), ensuring that the
trap is set correctly for the loaded context (if any).

Fixes: e6b673b7 ("KVM: arm64: Optimise FPSIMD handling to reduce guest/host thrashing")
Signed-off-by: NDave Martin <Dave.Martin@arm.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
      b3eb56b6
    • D
      KVM: arm64: Don't mask softirq with IRQs disabled in vcpu_put() · b045e4d0
      由 Dave Martin 提交于 
      Commit e6b673b7 ("KVM: arm64: Optimise FPSIMD handling to reduce
guest/host thrashing") introduces a specific helper
kvm_arch_vcpu_put_fp() for saving the vcpu FPSIMD state during
vcpu_put().

This function uses local_bh_disable()/_enable() to protect the
FPSIMD context manipulation from interruption by softirqs.

This approach is not correct, because vcpu_put() can be invoked
either from the KVM host vcpu thread (when exiting the vcpu run
loop), or via a preempt notifier.  In the former case, only
preemption is disabled.  In the latter case, the function is called
from inside __schedule(), which means that IRQs are disabled.

Use of local_bh_disable()/_enable() with IRQs disabled is considerd
an error, resulting in lockdep splats while running VMs if lockdep
is enabled.

This patch disables IRQs instead of attempting to disable softirqs,
avoiding the problem of calling local_bh_enable() with IRQs
disabled in the __schedule() path.  This creates an additional
interrupt blackout during vcpu run loop exit, but this is the rare
case and the blackout latency is still less than that of
__schedule().

Fixes: e6b673b7 ("KVM: arm64: Optimise FPSIMD handling to reduce guest/host thrashing")
Reported-by: NAndre Przywara <andre.przywara@arm.com>
Signed-off-by: NDave Martin <Dave.Martin@arm.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
      b045e4d0
    • M
      arm64: Introduce sysreg_clear_set() · 6ebdf4db
      由 Mark Rutland 提交于 
      Currently we have a couple of helpers to manipulate bits in particular
sysregs:

 * config_sctlr_el1(u32 clear, u32 set)

 * change_cpacr(u64 val, u64 mask)

The parameters of these differ in naming convention, order, and size,
which is unfortunate. They also differ slightly in behaviour, as
change_cpacr() skips the sysreg write if the bits are unchanged, which
is a useful optimization when sysreg writes are expensive.

Before we gain yet another sysreg manipulation function, let's
unify these with a common helper, providing a consistent order for
clear/set operands, and the write skipping behaviour from
change_cpacr(). Code will be migrated to the new helper in subsequent
patches.
Signed-off-by: NMark Rutland <mark.rutland@arm.com>
Reviewed-by: NDave Martin <dave.martin@arm.com>
Acked-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
      6ebdf4db
    • A
      KVM: arm/arm64: Drop resource size check for GICV window · ba56bc3a
      由 Ard Biesheuvel 提交于 
      When booting a 64 KB pages kernel on a ACPI GICv3 system that
implements support for v2 emulation, the following warning is
produced

  GICV size 0x2000 not a multiple of page size 0x10000

and support for v2 emulation is disabled, preventing GICv2 VMs
from being able to run on such hosts.

The reason is that vgic_v3_probe() performs a sanity check on the
size of the window (it should be a multiple of the page size),
while the ACPI MADT parsing code hardcodes the size of the window
to 8 KB. This makes sense, considering that ACPI does not bother
to describe the size in the first place, under the assumption that
platforms implementing ACPI will follow the architecture and not
put anything else in the same 64 KB window.

So let's just drop the sanity check altogether, and assume that
the window is at least 64 KB in size.

Fixes: 90977732 ("KVM: arm/arm64: vgic-new: vgic_init: implement kvm_vgic_hyp_init")
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
      ba56bc3a
    • D
      Merge branch 'drm-fixes-4.18' of git://people.freedesktop.org/~agd5f/linux into drm-fixes · ae0c7306
      由 Dave Airlie 提交于 
      Bunch of amdgpu fixes mostly all going to stable.
Signed-off-by: NDave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180620190021.2775-1-alexander.deucher@amd.com
      ae0c7306
    • R
      Merge branch 'turbostat' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux · 3af20c95
      由 Rafael J. Wysocki 提交于 
      Pull turbostat utility changes for 4.18-rc2 from Len Brown.

"This includes two regression fixes, plus a couple more random, but
 worthy, patches."

* 'turbostat' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux:
  tools/power turbostat: version 18.06.20
  tools/power turbostat: add the missing command line switches
  tools/power turbostat: add single character tokens to help
  tools/power turbostat: alphabetize the help output
  tools/power turbostat: fix segfault on 'no node' machines
  tools/power turbostat: add optional APIC X2APIC columns
  tools/power turbostat: decode cpuid.1.HT
  tools/power turbostat: fix show/hide issues resulting from mis-merge
      3af20c95