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| author |   Shannon Zhao <shannon.zhao@linaro.org> | 2015-10-28 12:10:30 +0800 |
|---|---|---|
| committer |   Marc Zyngier <marc.zyngier@arm.com> | 2016-02-29 18:34:21 +0000 |
| commit | 76993739cd6f5b42e881fe3332b9f8eb98cd6907 (patch) | |
| tree | c2a3e47cacfff585748d69b685c6c8a2e5a390e4 /virt | |
| parent | arm64: KVM: Add access handler for PMSWINC register (diff) | |
| download | linux-dev-76993739cd6f5b42e881fe3332b9f8eb98cd6907.tar.xz linux-dev-76993739cd6f5b42e881fe3332b9f8eb98cd6907.zip | |
arm64: KVM: Add helper to handle PMCR register bits
According to ARMv8 spec, when writing 1 to PMCR.E, all counters are
enabled by PMCNTENSET, while writing 0 to PMCR.E, all counters are
disabled. When writing 1 to PMCR.P, reset all event counters, not
including PMCCNTR, to zero. When writing 1 to PMCR.C, reset PMCCNTR to
zero.
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/pmu.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c index 9fc775ef03ec..cda869c609dd 100644 --- a/virt/kvm/arm/pmu.c +++ b/virt/kvm/arm/pmu.c @@ -210,6 +210,40 @@ void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val) } } +/** + * kvm_pmu_handle_pmcr - handle PMCR register + * @vcpu: The vcpu pointer + * @val: the value guest writes to PMCR register + */ +void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val) +{ + struct kvm_pmu *pmu = &vcpu->arch.pmu; + struct kvm_pmc *pmc; + u64 mask; + int i; + + mask = kvm_pmu_valid_counter_mask(vcpu); + if (val & ARMV8_PMU_PMCR_E) { + kvm_pmu_enable_counter(vcpu, + vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & mask); + } else { + kvm_pmu_disable_counter(vcpu, mask); + } + + if (val & ARMV8_PMU_PMCR_C) + kvm_pmu_set_counter_value(vcpu, ARMV8_PMU_CYCLE_IDX, 0); + + if (val & ARMV8_PMU_PMCR_P) { + for (i = 0; i < ARMV8_PMU_CYCLE_IDX; i++) + kvm_pmu_set_counter_value(vcpu, i, 0); + } + + if (val & ARMV8_PMU_PMCR_LC) { + pmc = &pmu->pmc[ARMV8_PMU_CYCLE_IDX]; + pmc->bitmask = 0xffffffffffffffffUL; + } +} + static bool kvm_pmu_counter_is_enabled(struct kvm_vcpu *vcpu, u64 select_idx) { return (vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E) && |