KVM: x86/pmu: Restrict advanced features based on module enable_pmu

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Once vPMU is disabled, the KVM would not expose features like:
PEBS (via clear kvm_pmu_cap.pebs_ept), legacy LBR and ARCH_LBR,
CPUID 0xA leaf, PDCM bit and MSR_IA32_PERF_CAPABILITIES, plus
PT_MODE_HOST_GUEST mode.

What this group of features has in common is that their use
relies on the underlying PMU counter and the host perf_event as a
back-end resource requester or sharing part of the irq delivery path.

Signed-off-by: Like Xu <likexu@tencent.com>
Message-Id: <20220601031925.59693-2-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Like Xu 2022-06-01 11:19:24 +08:00 • committed by Paolo Bonzini

parent b9181c8ef3

commit 6ef25aa0a9

3 changed files with 12 additions and 3 deletions

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6

arch/x86/kvm/pmu.h

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4

arch/x86/kvm/vmx/capabilities.h

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5

arch/x86/kvm/vmx/vmx.c

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