diff options
Diffstat (limited to 'arch/arm64/kvm/pmu-emul.c')
| -rw-r--r-- | arch/arm64/kvm/pmu-emul.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index ac36c438b8c1..28f938f145ac 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -265,6 +265,24 @@ void kvm_pmu_vcpu_destroy(struct kvm_vcpu *vcpu) irq_work_sync(&vcpu->arch.pmu.overflow_work); } +bool kvm_pmu_counter_is_hyp(struct kvm_vcpu *vcpu, unsigned int idx) +{ + unsigned int hpmn; + + if (!vcpu_has_nv(vcpu) || idx == ARMV8_PMU_CYCLE_IDX) + return false; + + /* + * Programming HPMN=0 is CONSTRAINED UNPREDICTABLE if FEAT_HPMN0 isn't + * implemented. Since KVM's ability to emulate HPMN=0 does not directly + * depend on hardware (all PMU registers are trapped), make the + * implementation choice that all counters are included in the second + * range reserved for EL2/EL3. + */ + hpmn = SYS_FIELD_GET(MDCR_EL2, HPMN, __vcpu_sys_reg(vcpu, MDCR_EL2)); + return idx >= hpmn; +} + u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu) { u64 val = FIELD_GET(ARMV8_PMU_PMCR_N, kvm_vcpu_read_pmcr(vcpu)); |