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KVM: arm64: Let kvm_vcpu_read_pmcr() return an EL-dependent value for PMCR_EL0.N

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When EL2 is present, PMCR_EL0.N is the effective value of MDCR_EL2.HPMN
when accessed from EL1 or EL0.

Make sure we honor this requirement.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier
2025-04-11 12:02:20 +01:00
parent efff9dd2fe
commit 600f6fa5c9
1 changed files with 5 additions and 1 deletions
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6
arch/arm64/kvm/pmu-emul.c
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@@ -1300,8 +1300,12 @@ u8 kvm_arm_pmu_get_pmuver_limit(void)
u64 kvm_vcpu_read_pmcr(struct kvm_vcpu *vcpu)
{
u64 pmcr = __vcpu_sys_reg(vcpu, PMCR_EL0);
u64 n = vcpu->kvm->arch.nr_pmu_counters;
return u64_replace_bits(pmcr, vcpu->kvm->arch.nr_pmu_counters, ARMV8_PMU_PMCR_N);
if (vcpu_has_nv(vcpu) && !vcpu_is_el2(vcpu))
n = FIELD_GET(MDCR_EL2_HPMN, __vcpu_sys_reg(vcpu, MDCR_EL2));
return u64_replace_bits(pmcr, n, ARMV8_PMU_PMCR_N);
}
void kvm_pmu_nested_transition(struct kvm_vcpu *vcpu)