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KVM: arm64: nv: Reprogram PMU events affected by nested transition

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Start reprogramming PMU events at nested boundaries now that everything
is in place to handle the EL2 event filter. Only repaint events where
the filter differs between EL1 and EL2 as a slight optimization.

PMU now 'works' for nested VMs, albeit slow.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241025182559.3364829-1-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton
2024-10-25 18:25:59 +00:00
parent 8a34979030
commit ae323e0358
3 changed files with 36 additions and 0 deletions
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4
arch/arm64/kvm/emulate-nested.c
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@@ -2450,6 +2450,8 @@ void kvm_emulate_nested_eret(struct kvm_vcpu *vcpu)
kvm_arch_vcpu_load(vcpu, smp_processor_id());
preempt_enable();
kvm_pmu_nested_transition(vcpu);
}
static void kvm_inject_el2_exception(struct kvm_vcpu *vcpu, u64 esr_el2,
@@ -2532,6 +2534,8 @@ static int kvm_inject_nested(struct kvm_vcpu *vcpu, u64 esr_el2,
kvm_arch_vcpu_load(vcpu, smp_processor_id());
preempt_enable();
kvm_pmu_nested_transition(vcpu);
return 1;
}