[PATCH v3 0/3] KVM: x86: Intel LBR related perf cleanups.

[Sean Christopherson]

WAS: Bug fixes and cleanups related to KVM's handling of PERF_CAPABILITIES.

Fix a bug where KVM incorrectly advertises PMU_CAP_LBR_FMT to userspace if
perf has disabled LBRs, e.g. because probing one or more LBR MSRs during
setup hit a #GP.

The non-KVM patches remove unnecessary stubs and unreachable error paths,
which allows for a cleaner fix for said bug.

v3:
 - Drop patches for bug #1 (already merged).
 - Drop misguided "clean up the capability check" patch. [Like]

v2:
 - https://lore.kernel.org/all/20220803192658.860033-1-seanjc@xxxxxxxxxx
 - Add patches to fix bug #2. [Like]
 - Add a patch to clean up the capability check.
 - Tweak the changelog for the PMU refresh bug fix to call out that
   KVM should disallow changing feature MSRs after KVM_RUN. [Like]

v1: https://lore.kernel.org/all/20220727233424.2968356-1-seanjc@xxxxxxxxxx

Sean Christopherson (3):
  perf/x86/core: Remove unnecessary stubs provided for KVM-only helpers
  perf/x86/core: Drop the unnecessary return value from
    x86_perf_get_lbr()
  KVM: VMX: Advertise PMU LBRs if and only if perf supports LBRs

 arch/x86/events/intel/lbr.c       |  6 +---
 arch/x86/include/asm/perf_event.h | 55 ++++++++-----------------------
 arch/x86/kvm/vmx/capabilities.h   |  5 ++-
 3 files changed, 19 insertions(+), 47 deletions(-)


base-commit: 372d07084593dc7a399bf9bee815711b1fb1bcf2
-- 
2.37.2.672.g94769d06f0-goog