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| author |  Like Xu <likexu@tencent.com>
| 2022-09-23 00:13:54 +0000 |
|---|---|---|
| committer |  Paolo Bonzini <pbonzini@redhat.com>
| 2022-11-09 12:31:36 -0500 |
| commit | 68fb4757e8678894530ee0b15c29a3567207b970 (patch) | |
| tree | 711ba4357bd7d0f1fa7266f7ca36ca1820a3205e /arch/x86/kvm/pmu.h | |
| parent | KVM: x86/pmu: Clear "reprogram" bit if counter is disabled or disallowed (diff) | |
| download | linux-68fb4757e8678894530ee0b15c29a3567207b970.tar.gz linux-68fb4757e8678894530ee0b15c29a3567207b970.tar.bz2 linux-68fb4757e8678894530ee0b15c29a3567207b970.zip | |
KVM: x86/pmu: Defer reprogram_counter() to kvm_pmu_handle_event()
Batch reprogramming PMU counters by setting KVM_REQ_PMU and thus
deferring reprogramming kvm_pmu_handle_event() to avoid reprogramming
a counter multiple times during a single VM-Exit.
Deferring programming will also allow KVM to fix a bug where immediately
reprogramming a counter can result in sleeping (taking a mutex) while
interrupts are disabled in the VM-Exit fastpath.
Introduce kvm_pmu_request_counter_reprogam() to make it obvious that
KVM is _requesting_ a reprogram and not actually doing the reprogram.
Opportunistically refine related comments to avoid misunderstandings.
Signed-off-by: Like Xu <likexu@tencent.com>
Link: https://lore.kernel.org/r/20220831085328.45489-5-likexu@tencent.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220923001355.3741194-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/pmu.h')
| -rw-r--r-- | arch/x86/kvm/pmu.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h index 5cc5721f260b..85ff3c0588ba 100644 --- a/arch/x86/kvm/pmu.h +++ b/arch/x86/kvm/pmu.h @@ -183,7 +183,11 @@ static inline void kvm_init_pmu_capability(void) KVM_PMC_MAX_FIXED); } -void reprogram_counter(struct kvm_pmc *pmc); +static inline void kvm_pmu_request_counter_reprogam(struct kvm_pmc *pmc) +{ + set_bit(pmc->idx, pmc_to_pmu(pmc)->reprogram_pmi); + kvm_make_request(KVM_REQ_PMU, pmc->vcpu); +} void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu); void kvm_pmu_handle_event(struct kvm_vcpu *vcpu); |