KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled

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On Intel platforms, the software can use the IA32_MISC_ENABLE[7] bit to
detect whether the processor supports performance monitoring facility.

It depends on the PMU is enabled for the guest, and a software write
operation to this available bit will be ignored. The proposal to ignore
the toggle in KVM is the way to go and that behavior matches bare metal.

Signed-off-by: Like Xu <likexu@tencent.com>
Message-Id: <20220411101946.20262-5-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Like Xu 2022-04-11 18:19:33 +08:00 • committed by Paolo Bonzini

parent 39a4d77954

commit bef6ecca46

2 changed files with 14 additions and 2 deletions

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arch/x86/kvm/vmx/pmu_intel.c

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15

arch/x86/kvm/x86.c

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