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>

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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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arch/x86/kvm/pmu.c

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