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| author | Shannon Zhao <shannon.zhao@linaro.org> | 2015-09-08 15:49:39 +0800 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2016-02-29 18:34:20 +0000 |
| commit | 7a0adc7064b88609e2917446af8789fac1d4fdd1 (patch) | |
| tree | c534e2ffac1a2977b3d5be4e2fe07c1ddc145fe4 /virt | |
| parent | 76d883c4e6401b98ea26d40c437ff62719a517ad (diff) | |
| download | linux-7a0adc7064b88609e2917446af8789fac1d4fdd1.tar.bz2 | |
arm64: KVM: Add access handler for PMSWINC register
Add access handler which emulates writing and reading PMSWINC
register and add support for creating software increment event.
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Andrew Jones <drjones@redhat.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 023286101fef..9fc775ef03ec 100644 --- a/virt/kvm/arm/pmu.c +++ b/virt/kvm/arm/pmu.c @@ -180,6 +180,36 @@ void kvm_pmu_overflow_set(struct kvm_vcpu *vcpu, u64 val) kvm_vcpu_kick(vcpu); } +/** + * kvm_pmu_software_increment - do software increment + * @vcpu: The vcpu pointer + * @val: the value guest writes to PMSWINC register + */ +void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val) +{ + int i; + u64 type, enable, reg; + + if (val == 0) + return; + + enable = vcpu_sys_reg(vcpu, PMCNTENSET_EL0); + for (i = 0; i < ARMV8_PMU_CYCLE_IDX; i++) { + if (!(val & BIT(i))) + continue; + type = vcpu_sys_reg(vcpu, PMEVTYPER0_EL0 + i) + & ARMV8_PMU_EVTYPE_EVENT; + if ((type == ARMV8_PMU_EVTYPE_EVENT_SW_INCR) + && (enable & BIT(i))) { + reg = vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) + 1; + reg = lower_32_bits(reg); + vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) = reg; + if (!reg) + kvm_pmu_overflow_set(vcpu, BIT(i)); + } + } +} + 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) && @@ -208,6 +238,10 @@ void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data, kvm_pmu_stop_counter(vcpu, pmc); eventsel = data & ARMV8_PMU_EVTYPE_EVENT; + /* Software increment event does't need to be backed by a perf event */ + if (eventsel == ARMV8_PMU_EVTYPE_EVENT_SW_INCR) + return; + memset(&attr, 0, sizeof(struct perf_event_attr)); attr.type = PERF_TYPE_RAW; attr.size = sizeof(attr); |