From: Sean Christopherson <seanjc@google.com>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, Like Xu <like.xu.linux@gmail.com>
Subject: [PATCH v3 0/3] KVM: x86: Intel LBR related perf cleanups.
Date: Wed, 31 Aug 2022 00:00:48 +0000 [thread overview]
Message-ID: <20220831000051.4015031-1-seanjc@google.com> (raw)
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@google.com
- 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@google.com
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
next reply other threads:[~2022-08-31 0:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-31 0:00 Sean Christopherson [this message]
2022-08-31 0:00 ` [PATCH v3 1/3] perf/x86/core: Remove unnecessary stubs provided for KVM-only helpers Sean Christopherson
2022-08-31 0:00 ` [PATCH v3 2/3] perf/x86/core: Drop the unnecessary return value from x86_perf_get_lbr() Sean Christopherson
2022-08-31 0:00 ` [PATCH v3 3/3] KVM: VMX: Advertise PMU LBRs if and only if perf supports LBRs Sean Christopherson
2022-08-31 9:49 ` kernel test robot
2022-08-31 11:12 ` kernel test robot
2022-08-31 19:54 ` Sean Christopherson
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