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KVM: arm64: Fix host-programmed guest events in nVHE 

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: 84d751a019 ("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>
This commit is contained in:
Oliver Upton 2024-03-05 18:48:39 +00:00
parent 4cece76496
commit e89c928bed
1 changed files with 1 additions and 1 deletions
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2
include/kvm/arm_pmu.h
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@ -86,7 +86,7 @@ void kvm_vcpu_pmu_resync_el0(void);
*/ */
#define kvm_pmu_update_vcpu_events(vcpu) \ #define kvm_pmu_update_vcpu_events(vcpu) \
do { \ 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(); \ vcpu->arch.pmu.events = *kvm_get_pmu_events(); \
} while (0) } while (0)