6.6-stable review patch. If anyone has any objections, please let me know.
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From: Oliver Upton oliver.upton@linux.dev
commit e89c928bedd77d181edc2df01cb6672184775140 upstream.
Programming PMU events in the host that count during guest execution is a feature supported by perf, e.g.
perf stat -e cpu_cycles:G ./lkvm run
While this works for VHE, the guest/host event bitmaps are not carried through to the hypervisor in the nVHE configuration. Make kvm_pmu_update_vcpu_events() conditional on whether or not _hardware_ supports PMUv3 rather than if the vCPU as vPMU enabled.
Cc: stable@vger.kernel.org Fixes: 84d751a019a9 ("KVM: arm64: Pass pmu events to hyp via vcpu") Reviewed-by: Marc Zyngier maz@kernel.org Link: https://lore.kernel.org/r/20240305184840.636212-3-oliver.upton@linux.dev Signed-off-by: Oliver Upton oliver.upton@linux.dev Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/kvm/arm_pmu.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/kvm/arm_pmu.h +++ b/include/kvm/arm_pmu.h @@ -86,7 +86,7 @@ void kvm_vcpu_pmu_resync_el0(void); */ #define kvm_pmu_update_vcpu_events(vcpu) \ do { \ - if (!has_vhe() && kvm_vcpu_has_pmu(vcpu)) \ + if (!has_vhe() && kvm_arm_support_pmu_v3()) \ vcpu->arch.pmu.events = *kvm_get_pmu_events(); \ } while (0)