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KVM: x86/pmu: Allow Host-Only/Guest-Only bits with nSVM and mediated PMU

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Now that KVM correctly handles Host-Only and Guest-Only bits in the
event selector MSRs, allow the guest to set them if the vCPU advertises
SVM and uses the mediated PMU.

Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Yosry Ahmed <yosry@kernel.org>
Link: https://patch.msgid.link/20260527234711.4175166-14-yosry@kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Jim Mattson 2026-05-27 23:47:07 +00:00 committed by Sean Christopherson
parent a02a25a652
commit f4805dcf2d
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/svm/pmu.c
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@ -213,7 +213,11 @@ static void amd_pmu_refresh(struct kvm_vcpu *vcpu)
}
pmu->counter_bitmask[KVM_PMC_GP] = BIT_ULL(48) - 1;
pmu->reserved_bits = 0xfffffff000280000ull;
if (guest_cpu_cap_has(vcpu, X86_FEATURE_SVM) && kvm_vcpu_has_mediated_pmu(vcpu))
pmu->reserved_bits &= ~AMD64_EVENTSEL_HOST_GUEST_MASK;
pmu->raw_event_mask = AMD64_RAW_EVENT_MASK;
/* not applicable to AMD; but clean them to prevent any fall out */
pmu->counter_bitmask[KVM_PMC_FIXED] = 0;