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KVM: x86/pmu: Ignore pmu->global_ctrl check if vPMU doesn't support global_ctrl

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[ Upstream commit 98defd2e17 ]

MSR_CORE_PERF_GLOBAL_CTRL is introduced as part of Architecture PMU V2,
as indicated by Intel SDM 19.2.2 and the intel_is_valid_msr() function.

So in the absence of global_ctrl support, all PMCs are enabled as AMD does.

Signed-off-by: Like Xu <likexu@tencent.com>
Message-Id: <20220509102204.62389-1-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Like Xu 2022-05-09 18:22:02 +08:00 • committed by Greg Kroah-Hartman
commit b788508a09
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/vmx/pmu_intel.c
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@ -104,6 +104,9 @@ static bool intel_pmc_is_enabled(struct kvm_pmc *pmc)
{
struct kvm_pmu *pmu = pmc_to_pmu(pmc);
if (pmu->version < 2)
return true;
return test_bit(pmc->idx, (unsigned long *)&pmu->global_ctrl);
}