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
