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KVM: x86/pmu: Check mediated PMU counter enablement before event filters

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If the guest disables the counter (by clearing
ARCH_PERFMON_EVENTSEL_ENABLE), KVM still performs the PMU filter lookup,
even though it doesn't end up changing eventsel_hw.  Check if the
counter is enabled by the guest before doing the potentially expensive
PMU filter lookup.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Yosry Ahmed <yosry@kernel.org>
Link: https://patch.msgid.link/20260527234711.4175166-9-yosry@kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Yosry Ahmed 2026-05-27 23:47:02 +00:00 committed by Sean Christopherson
parent e48810e06f
commit 232eadc311
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/pmu.c
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@ -532,7 +532,7 @@ static bool pmc_is_event_allowed(struct kvm_pmc *pmc)
static void kvm_mediated_pmu_refresh_event_filter(struct kvm_pmc *pmc)
{
bool allowed = pmc_is_event_allowed(pmc);
bool allowed = pmc_is_locally_enabled(pmc) && pmc_is_event_allowed(pmc);
struct kvm_pmu *pmu = pmc_to_pmu(pmc);
if (pmc_is_gp(pmc)) {