From: Shannon Zhao <[email protected]> When calling perf_event_create_kernel_counter to create perf_event, assign a overflow handler. Then when perf event overflows, if vcpu doesn't run, call irq_work_queue to wake up vcpu. Otherwise call kvm_vgic_inject_irq to inject the interrupt.
Signed-off-by: Shannon Zhao <[email protected]> --- arch/arm/kvm/arm.c | 2 ++ include/kvm/arm_pmu.h | 2 ++ virt/kvm/arm/pmu.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 56 insertions(+), 1 deletion(-) diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 4e82625..41eb063 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -551,6 +551,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) preempt_enable(); kvm_timer_sync_hwstate(vcpu); kvm_vgic_sync_hwstate(vcpu); + kvm_pmu_sync_hwstate(vcpu); continue; } @@ -595,6 +596,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) kvm_timer_sync_hwstate(vcpu); kvm_vgic_sync_hwstate(vcpu); + kvm_pmu_sync_hwstate(vcpu); ret = handle_exit(vcpu, run, ret); } diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h index 6985809..5bcf27b 100644 --- a/include/kvm/arm_pmu.h +++ b/include/kvm/arm_pmu.h @@ -45,6 +45,7 @@ struct kvm_pmu { }; #ifdef CONFIG_KVM_ARM_PMU +void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu); void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu); void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu, unsigned long select_idx, unsigned long val); @@ -59,6 +60,7 @@ void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, unsigned long data, unsigned long select_idx); void kvm_pmu_init(struct kvm_vcpu *vcpu); #else +void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu) {} static inline void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu) {} void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu, unsigned long select_idx, unsigned long val) {} diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c index e655426..f957b85 100644 --- a/virt/kvm/arm/pmu.c +++ b/virt/kvm/arm/pmu.c @@ -20,6 +20,7 @@ #include <linux/kvm_host.h> #include <linux/perf_event.h> #include <kvm/arm_pmu.h> +#include <kvm/arm_vgic.h> /* PMU HW events mapping. */ static struct kvm_pmu_hw_event_map { @@ -81,6 +82,23 @@ static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, } /** + * kvm_pmu_sync_hwstate - sync pmu state for cpu + * @vcpu: The vcpu pointer + * + * Inject virtual PMU IRQ if IRQ is pending for this cpu. + */ +void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu) +{ + struct kvm_pmu *pmu = &vcpu->arch.pmu; + + if (pmu->irq_pending) { + kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id, pmu->irq_num, 1); + pmu->irq_pending = 0; + return; + } +} + +/** * kvm_pmu_vcpu_reset - reset pmu state for cpu * @vcpu: The vcpu pointer * @@ -96,6 +114,37 @@ void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu) pmu->irq_pending = false; } +static void kvm_pum_trigger_pmi(struct irq_work *irq_work) +{ + struct kvm_pmu *pmu = container_of(irq_work, struct kvm_pmu, irq_work); + struct kvm_vcpu *vcpu = container_of(pmu, struct kvm_vcpu, arch.pmu); + + kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id, pmu->irq_num, 1); +} + +/** + * When perf event overflows, if vcpu doesn't run, call irq_work_queue to wake + * up vcpu. Otherwise call kvm_vgic_inject_irq to inject the interrupt. + */ +static void kvm_pmu_perf_overflow(struct perf_event *perf_event, + struct perf_sample_data *data, + struct pt_regs *regs) +{ + struct kvm_pmc *pmc = perf_event->overflow_handler_context; + struct kvm_vcpu *vcpu = pmc->vcpu; + struct kvm_pmu *pmu = &vcpu->arch.pmu; + + if (pmc->interrupt == true) { + __set_bit(pmc->idx, (unsigned long *)&pmu->overflow_status); + pmu->irq_pending = 1; + if (vcpu->mode != IN_GUEST_MODE) + irq_work_queue(&pmu->irq_work); + else + kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id, + pmu->irq_num, 1); + } +} + /** * kvm_pmu_set_counter_value - set PMU counter value * @vcpu: The vcpu pointer @@ -322,7 +371,8 @@ void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, unsigned long data, attr.config = config; attr.sample_period = (-pmc->counter) & (((u64)1 << 32) - 1); - event = perf_event_create_kernel_counter(&attr, -1, current, NULL, pmc); + event = perf_event_create_kernel_counter(&attr, -1, current, + kvm_pmu_perf_overflow, pmc); if (IS_ERR(event)) { kvm_err("kvm: pmu event creation failed %ld\n", PTR_ERR(event)); @@ -351,4 +401,5 @@ void kvm_pmu_init(struct kvm_vcpu *vcpu) } pmu->irq_num = -1; + init_irq_work(&pmu->irq_work, kvm_pum_trigger_pmi); } -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
