Messages in this thread | | | Date | Wed, 27 Jul 2022 23:34:21 +0000 | Subject | [PATCH 0/3] KVM: x86: Intel PERF_CAPABILITIES fix and cleanups | From | Sean Christopherson <> |
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Fix a bug where KVM doesn't refresh the vPMU after userspace writes PERF_CAPABILITIES, and then leverage that fix to avoiding checking guest_cpuid_has(X86_FEATURE_PDCM) during VM-Enter, which is slow enough that it shows up in perf traces[*].
[*] https://gist.github.com/avagin/f50a6d569440c9ae382281448c187f4e
Sean Christopherson (3): KVM: x86: Refresh PMU after writes to MSR_IA32_PERF_CAPABILITIES KVM: VMX: Use proper type-safe functions for vCPU => LBRs helpers KVM: VMX: Adjust number of LBR records for PERF_CAPABILITIES at refresh
arch/x86/kvm/vmx/pmu_intel.c | 12 +++--------- arch/x86/kvm/vmx/vmx.h | 29 ++++++++++++++++++++--------- arch/x86/kvm/x86.c | 4 ++-- 3 files changed, 25 insertions(+), 20 deletions(-)
base-commit: 1a4d88a361af4f2e91861d632c6a1fe87a9665c2 -- 2.37.1.359.gd136c6c3e2-goog
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