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| author |  Sean Christopherson <seanjc@google.com>
| 2023-11-09 18:28:54 -0800 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com>
| 2024-02-01 09:35:48 -0800 |
| commit | f19063b1ca058b3971d6883b5ec45955b7f53f9c (patch) | |
| tree | c9735124a691431474aec14d1a00aaa74a22e68a /arch/x86/kvm/vmx/nested.c | |
| parent | KVM: x86/pmu: Process only enabled PMCs when emulating events in software (diff) | |
| download | linux-f19063b1ca058b3971d6883b5ec45955b7f53f9c.tar.gz linux-f19063b1ca058b3971d6883b5ec45955b7f53f9c.tar.bz2 linux-f19063b1ca058b3971d6883b5ec45955b7f53f9c.zip | |
KVM: x86/pmu: Snapshot event selectors that KVM emulates in software
Snapshot the event selectors for the events that KVM emulates in software,
which is currently instructions retired and branch instructions retired.
The event selectors a tied to the underlying CPU, i.e. are constant for a
given platform even though perf doesn't manage the mappings as such.
Getting the event selectors from perf isn't exactly cheap, especially if
mitigations are enabled, as at least one indirect call is involved.
Snapshot the values in KVM instead of optimizing perf as working with the
raw event selectors will be required if KVM ever wants to emulate events
that aren't part of perf's uABI, i.e. that don't have an "enum perf_hw_id"
entry.
Link: https://lore.kernel.org/r/20231110022857.1273836-8-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/vmx/nested.c')
| -rw-r--r-- | arch/x86/kvm/vmx/nested.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index 6329a306856b..994e014f8a50 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -3606,7 +3606,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) return 1; } - kvm_pmu_trigger_event(vcpu, PERF_COUNT_HW_BRANCH_INSTRUCTIONS); + kvm_pmu_trigger_event(vcpu, kvm_pmu_eventsel.BRANCH_INSTRUCTIONS_RETIRED); if (CC(evmptrld_status == EVMPTRLD_VMFAIL)) return nested_vmx_failInvalid(vcpu); |