linux.git/arch/x86/include/asm, branch v5.6

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2020-03-14T22:45:26+00:00

Pull kvm fixes from Paolo Bonzini:
 "Bugfixes for x86 and s390"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: nVMX: avoid NULL pointer dereference with incorrect EVMCS GPAs
  KVM: x86: Initializing all kvm_lapic_irq fields in ioapic_write_indirect
  KVM: VMX: Condition ENCLS-exiting enabling on CPU support for SGX1
  KVM: s390: Also reset registers in sync regs for initial cpu reset
  KVM: fix Kconfig menu text for -Werror
  KVM: x86: remove stale comment from struct x86_emulate_ctxt
  KVM: x86: clear stale x86_emulate_ctxt->intercept value
  KVM: SVM: Fix the svm vmexit code for WRMSR
  KVM: X86: Fix dereference null cpufreq policy

KVM: x86: remove stale comment from struct x86_emulate_ctxt

2020-03-03T16:38:22+00:00

Commit c44b4c6ab80e ("KVM: emulate: clean up initializations in
init_decode_cache") did some field shuffling and instead of
[opcode_len, _regs) started clearing [has_seg_override, modrm).
The comment about clearing fields altogether is not true anymore.

Fixes: c44b4c6ab80e ("KVM: emulate: clean up initializations in init_decode_cache")
Signed-off-by: Vitaly Kuznetsov 
Signed-off-by: Paolo Bonzini

Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2020-03-02T12:54:54+00:00

Pull x86 fixes from Ingo Molnar:
 "Misc fixes: a pkeys fix for a bug that triggers with weird BIOS
  settings, and two Xen PV fixes: a paravirt interface fix, and
  pagetable dumping fix"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm: Fix dump_pagetables with Xen PV
  x86/ioperm: Add new paravirt function update_io_bitmap()
  x86/pkeys: Manually set X86_FEATURE_OSPKE to preserve existing changes

x86/ioperm: Add new paravirt function update_io_bitmap()

2020-02-29T11:43:09+00:00

Commit 111e7b15cf10f6 ("x86/ioperm: Extend IOPL config to control ioperm()
as well") reworked the iopl syscall to use I/O bitmaps.

Unfortunately this broke Xen PV domains using that syscall as there is
currently no I/O bitmap support in PV domains.

Add I/O bitmap support via a new paravirt function update_io_bitmap which
Xen PV domains can use to update their I/O bitmaps via a hypercall.

Fixes: 111e7b15cf10f6 ("x86/ioperm: Extend IOPL config to control ioperm() as well")
Reported-by: Jan Beulich 
Signed-off-by: Juergen Gross 
Signed-off-by: Thomas Gleixner 
Tested-by: Jan Beulich 
Reviewed-by: Jan Beulich 
Cc:  # 5.5
Link: https://lkml.kernel.org/r/20200218154712.25490-1-jgross@suse.com

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2020-02-24T19:48:17+00:00

Pull kvm fixes from Paolo Bonzini:
 "Bugfixes, including the fix for CVE-2020-2732 and a few issues found
  by 'make W=1'"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: s390: rstify new ioctls in api.rst
  KVM: nVMX: Check IO instruction VM-exit conditions
  KVM: nVMX: Refactor IO bitmap checks into helper function
  KVM: nVMX: Don't emulate instructions in guest mode
  KVM: nVMX: Emulate MTF when performing instruction emulation
  KVM: fix error handling in svm_hardware_setup
  KVM: SVM: Fix potential memory leak in svm_cpu_init()
  KVM: apic: avoid calculating pending eoi from an uninitialized val
  KVM: nVMX: clear PIN_BASED_POSTED_INTR from nested pinbased_ctls only when apicv is globally disabled
  KVM: nVMX: handle nested posted interrupts when apicv is disabled for L1
  kvm: x86: svm: Fix NULL pointer dereference when AVIC not enabled
  KVM: VMX: Add VMX_FEATURE_USR_WAIT_PAUSE
  KVM: nVMX: Hold KVM's srcu lock when syncing vmcs12->shadow
  KVM: x86: don't notify userspace IOAPIC on edge-triggered interrupt EOI
  kvm/emulate: fix a -Werror=cast-function-type
  KVM: x86: fix incorrect comparison in trace event
  KVM: nVMX: Fix some obsolete comments and grammar error
  KVM: x86: fix missing prototypes
  KVM: x86: enable -Werror

KVM: nVMX: Emulate MTF when performing instruction emulation

2020-02-23T08:36:23+00:00

Since commit 5f3d45e7f282 ("kvm/x86: add support for
MONITOR_TRAP_FLAG"), KVM has allowed an L1 guest to use the monitor trap
flag processor-based execution control for its L2 guest. KVM simply
forwards any MTF VM-exits to the L1 guest, which works for normal
instruction execution.

However, when KVM needs to emulate an instruction on the behalf of an L2
guest, the monitor trap flag is not emulated. Add the necessary logic to
kvm_skip_emulated_instruction() to synthesize an MTF VM-exit to L1 upon
instruction emulation for L2.

Fixes: 5f3d45e7f282 ("kvm/x86: add support for MONITOR_TRAP_FLAG")
Signed-off-by: Oliver Upton 
Signed-off-by: Paolo Bonzini

KVM: nVMX: handle nested posted interrupts when apicv is disabled for L1

2020-02-21T17:05:21+00:00

Even when APICv is disabled for L1 it can (and, actually, is) still
available for L2, this means we need to always call
vmx_deliver_nested_posted_interrupt() when attempting an interrupt
delivery.

Suggested-by: Paolo Bonzini 
Signed-off-by: Vitaly Kuznetsov 
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini

KVM: VMX: Add VMX_FEATURE_USR_WAIT_PAUSE

2020-02-21T17:05:19+00:00

Commit 159348784ff0 ("x86/vmx: Introduce VMX_FEATURES_*") missed
bit 26 (enable user wait and pause) of Secondary Processor-based
VM-Execution Controls.

Add VMX_FEATURE_USR_WAIT_PAUSE flag so that it shows up in /proc/cpuinfo,
and use it to define SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE to make them
uniform.

Signed-off-by: Xiaoyao Li 
Reviewed-by: Vitaly Kuznetsov 
Signed-off-by: Paolo Bonzini

kvm/emulate: fix a -Werror=cast-function-type

2020-02-20T17:13:45+00:00

arch/x86/kvm/emulate.c: In function 'x86_emulate_insn':
arch/x86/kvm/emulate.c:5686:22: error: cast between incompatible
function types from 'int (*)(struct x86_emulate_ctxt *)' to 'void
(*)(struct fastop *)' [-Werror=cast-function-type]
    rc = fastop(ctxt, (fastop_t)ctxt->execute);

Fix it by using an unnamed union of a (*execute) function pointer and a
(*fastop) function pointer.

Fixes: 3009afc6e39e ("KVM: x86: Use a typedef for fastop functions")
Suggested-by: Paolo Bonzini 
Signed-off-by: Qian Cai 
Signed-off-by: Paolo Bonzini

x86/cpu/amd: Enable the fixed Instructions Retired counter IRPERF

2020-02-19T19:01:54+00:00

Commit

  aaf248848db50 ("perf/x86/msr: Add AMD IRPERF (Instructions Retired)
		  performance counter")

added support for access to the free-running counter via 'perf -e
msr/irperf/', but when exercised, it always returns a 0 count:

BEFORE:

  $ perf stat -e instructions,msr/irperf/ true

   Performance counter stats for 'true':

             624,833      instructions
                   0      msr/irperf/

Simply set its enable bit - HWCR bit 30 - to make it start counting.

Enablement is restricted to all machines advertising IRPERF capability,
except those susceptible to an erratum that makes the IRPERF return
bad values.

That erratum occurs in Family 17h models 00-1fh [1], but not in F17h
models 20h and above [2].

AFTER (on a family 17h model 31h machine):

  $ perf stat -e instructions,msr/irperf/ true

   Performance counter stats for 'true':

             621,690      instructions
             622,490      msr/irperf/

[1] Revision Guide for AMD Family 17h Models 00h-0Fh Processors
[2] Revision Guide for AMD Family 17h Models 30h-3Fh Processors

The revision guides are available from the bugzilla Link below.

 [ bp: Massage commit message. ]

Fixes: aaf248848db50 ("perf/x86/msr: Add AMD IRPERF (Instructions Retired) performance counter")
Signed-off-by: Kim Phillips 
Signed-off-by: Borislav Petkov 
Cc: Peter Zijlstra 
Cc: stable@vger.kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537
Link: http://lkml.kernel.org/r/20200214201805.13830-1-kim.phillips@amd.com