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| author | Yosry Ahmed <yosry@kernel.org> | 2026-05-27 23:47:01 +0000 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2026-05-27 18:45:49 -0700 |
| commit | e48810e06f45251a56bc007485854112e6cfc430 (patch) | |
| tree | 980e8600c660a9c7dfd10fbb2cb2a4227e546081 | |
| parent | 103cd7deda589c47f10cdf0f65cae21dbca35b9c (diff) | |
| download | linux-next-history-e48810e06f45251a56bc007485854112e6cfc430.tar.gz | |
KVM: x86/pmu: Do a single atomic OR when reprogramming counters
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>
| -rw-r--r-- | arch/x86/kvm/pmu.h | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h index f8286067722b0..0e99022168a85 100644 --- a/arch/x86/kvm/pmu.h +++ b/arch/x86/kvm/pmu.h @@ -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)); } |