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authorLike Xu <likexu@tencent.com>2022-09-23 00:13:54 +0000
committerPaolo Bonzini <pbonzini@redhat.com>2022-11-09 12:31:36 -0500
commit68fb4757e8678894530ee0b15c29a3567207b970 (patch)
tree711ba4357bd7d0f1fa7266f7ca36ca1820a3205e /arch/x86/crypto
parentdcbb816a2842e41d3ec22605c6760837d800b20a (diff)
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/crypto')
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