KVM: vmx/pmu: Add PMU_CAP_LBR_FMT check when guest LBR is enabled

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Usespace could set the bits [0, 5] of the IA32_PERF_CAPABILITIES
MSR which tells about the record format stored in the LBR records.

The LBR will be enabled on the guest if host perf supports LBR
(checked via x86_perf_get_lbr()) and the vcpu model is compatible
with the host one.

Signed-off-by: Like Xu <like.xu@linux.intel.com>
Message-Id: <20210201051039.255478-4-like.xu@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

This commit is contained in:

Like Xu 2021-02-01 13:10:31 +08:00 • committed by Paolo Bonzini

parent 9c9520ce88

commit c646236344

4 changed files with 25 additions and 2 deletions

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7

arch/x86/kvm/vmx/capabilities.h

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arch/x86/kvm/vmx/pmu_intel.c

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arch/x86/kvm/vmx/vmx.c

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1

arch/x86/kvm/vmx/vmx.h

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