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KVM: x86/pmu: Do a single atomic OR when reprogramming counters

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Do a single atomic OR using the atomic overlay of reprogram_pmi bitmask,
instead of one atomic set_bit() call per counter.

Signed-off-by: Yosry Ahmed <yosry@kernel.org>
Link: https://patch.msgid.link/20260527234711.4175166-8-yosry@kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Yosry Ahmed 2026-05-27 23:47:01 +00:00 committed by Sean Christopherson
parent 103cd7deda
commit e48810e06f
1 changed files with 1 additions and 4 deletions
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5
arch/x86/kvm/pmu.h
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@ -213,13 +213,10 @@ static inline void kvm_pmu_request_counter_reprogram(struct kvm_pmc *pmc)
static inline void kvm_pmu_request_counters_reprogram(struct kvm_pmu *pmu,
u64 counters)
{
int bit;
if (!counters)
return;
for_each_set_bit(bit, (unsigned long *)&counters, X86_PMC_IDX_MAX)
set_bit(bit, pmu->reprogram_pmi);
atomic64_or(counters, &pmu->__reprogram_pmi);
kvm_make_request(KVM_REQ_PMU, pmu_to_vcpu(pmu));
}