From: Christoffer Dall <[email protected]> When not using an in-kernel VGIC, but instead emulating an interrupt controller in userspace, we should report the PMU overflow status to that userspace interrupt controller using the KVM_CAP_ARM_USER_IRQ feature.
Signed-off-by: Christoffer Dall <[email protected]> --- arch/arm/kvm/arm.c | 9 ++++++--- include/kvm/arm_pmu.h | 7 +++++++ virt/kvm/arm/pmu.c | 42 ++++++++++++++++++++++++++++++++++++++---- 3 files changed, 51 insertions(+), 7 deletions(-) diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 505f928..92f38f6 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -628,11 +628,13 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) /* * If we have a singal pending, or need to notify a userspace - * irqchip about timer level changes, then we exit (and update - * the timer level state in kvm_timer_update_run below). + * irqchip about timer or PMU level changes, then we exit (and + * update the timer level state in kvm_timer_update_run + * below). */ if (signal_pending(current) || - kvm_timer_should_notify_user(vcpu)) { + kvm_timer_should_notify_user(vcpu) || + kvm_pmu_should_notify_user(vcpu)) { ret = -EINTR; run->exit_reason = KVM_EXIT_INTR; } @@ -706,6 +708,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) /* Tell userspace about in-kernel device output levels */ kvm_timer_update_run(vcpu); + kvm_pmu_update_run(vcpu); if (vcpu->sigset_active) sigprocmask(SIG_SETMASK, &sigsaved, NULL); diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h index 92e7e97..1ab4633 100644 --- a/include/kvm/arm_pmu.h +++ b/include/kvm/arm_pmu.h @@ -50,6 +50,8 @@ void kvm_pmu_enable_counter(struct kvm_vcpu *vcpu, u64 val); void kvm_pmu_overflow_set(struct kvm_vcpu *vcpu, u64 val); void kvm_pmu_flush_hwstate(struct kvm_vcpu *vcpu); void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu); +bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu); +void kvm_pmu_update_run(struct kvm_vcpu *vcpu); void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val); void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val); void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data, @@ -85,6 +87,11 @@ static inline void kvm_pmu_enable_counter(struct kvm_vcpu *vcpu, u64 val) {} static inline void kvm_pmu_overflow_set(struct kvm_vcpu *vcpu, u64 val) {} static inline void kvm_pmu_flush_hwstate(struct kvm_vcpu *vcpu) {} static inline void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu) {} +static inline bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu) +{ + return false; +} +static inline void kvm_pmu_update_run(struct kvm_vcpu *vcpu) {} static inline void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val) {} static inline void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val) {} static inline void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c index 69ccce3..51218be 100644 --- a/virt/kvm/arm/pmu.c +++ b/virt/kvm/arm/pmu.c @@ -230,13 +230,47 @@ static void kvm_pmu_update_state(struct kvm_vcpu *vcpu) return; overflow = !!kvm_pmu_overflow_status(vcpu); - if (pmu->irq_level != overflow) { - pmu->irq_level = overflow; - kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id, - pmu->irq_num, overflow); + if (pmu->irq_level == overflow) + return; + + pmu->irq_level = overflow; + + if (likely(irqchip_in_kernel(vcpu->kvm))) { + int ret; + ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id, + pmu->irq_num, overflow); + WARN_ON(ret); } } +bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu) +{ + struct kvm_pmu *pmu = &vcpu->arch.pmu; + struct kvm_sync_regs *sregs = &vcpu->run->s.regs; + bool run_level = sregs->device_irq_level & KVM_ARM_DEV_PMU; + + if (likely(irqchip_in_kernel(vcpu->kvm))) + return false; + + return pmu->irq_level != run_level; +} + +/* + * Reflect the PMU overflow interrupt output level into the kvm_run structure + */ +void kvm_pmu_update_run(struct kvm_vcpu *vcpu) +{ + struct kvm_sync_regs *regs = &vcpu->run->s.regs; + + if (likely(irqchip_in_kernel(vcpu->kvm))) + return; + + /* Populate the timer bitmap for user space */ + regs->device_irq_level &= ~KVM_ARM_DEV_PMU; + if (vcpu->arch.pmu.irq_level) + regs->device_irq_level |= KVM_ARM_DEV_PMU; +} + /** * kvm_pmu_flush_hwstate - flush pmu state to cpu * @vcpu: The vcpu pointer -- 2.9.0 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
