diff options
| -rw-r--r-- | arch/arm/kvm/arm.c | 2 | ||||
| -rw-r--r-- | include/kvm/arm_arch_timer.h | 2 | ||||
| -rw-r--r-- | virt/kvm/arm/arch_timer.c | 45 |
3 files changed, 39 insertions, 10 deletions
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 9a5f057a97a3..e98370cd9969 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -266,7 +266,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) { - return 0; + return kvm_timer_should_fire(vcpu); } int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) diff --git a/include/kvm/arm_arch_timer.h b/include/kvm/arm_arch_timer.h index a74e4c2bf188..e5966758c093 100644 --- a/include/kvm/arm_arch_timer.h +++ b/include/kvm/arm_arch_timer.h @@ -67,4 +67,6 @@ void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu); u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid); int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value); +bool kvm_timer_should_fire(struct kvm_vcpu *vcpu); + #endif diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c index 6e54f3542126..98c95f2fcba4 100644 --- a/virt/kvm/arm/arch_timer.c +++ b/virt/kvm/arm/arch_timer.c @@ -85,13 +85,22 @@ static irqreturn_t kvm_arch_timer_handler(int irq, void *dev_id) return IRQ_HANDLED; } +/* + * Work function for handling the backup timer that we schedule when a vcpu is + * no longer running, but had a timer programmed to fire in the future. + */ static void kvm_timer_inject_irq_work(struct work_struct *work) { struct kvm_vcpu *vcpu; vcpu = container_of(work, struct kvm_vcpu, arch.timer_cpu.expired); vcpu->arch.timer_cpu.armed = false; - kvm_timer_inject_irq(vcpu); + + /* + * If the vcpu is blocked we want to wake it up so that it will see + * the timer has expired when entering the guest. + */ + kvm_vcpu_kick(vcpu); } static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt) @@ -102,6 +111,21 @@ static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt) return HRTIMER_NORESTART; } +bool kvm_timer_should_fire(struct kvm_vcpu *vcpu) +{ + struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; + cycle_t cval, now; + + if ((timer->cntv_ctl & ARCH_TIMER_CTRL_IT_MASK) || + !(timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE)) + return false; + + cval = timer->cntv_cval; + now = kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff; + + return cval <= now; +} + /** * kvm_timer_flush_hwstate - prepare to move the virt timer to the cpu * @vcpu: The vcpu pointer @@ -119,6 +143,13 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu) * populate the CPU timer again. */ timer_disarm(timer); + + /* + * If the timer expired while we were not scheduled, now is the time + * to inject it. + */ + if (kvm_timer_should_fire(vcpu)) + kvm_timer_inject_irq(vcpu); } /** @@ -134,16 +165,9 @@ void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu) cycle_t cval, now; u64 ns; - if ((timer->cntv_ctl & ARCH_TIMER_CTRL_IT_MASK) || - !(timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE)) - return; - - cval = timer->cntv_cval; - now = kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff; - BUG_ON(timer_is_armed(timer)); - if (cval <= now) { + if (kvm_timer_should_fire(vcpu)) { /* * Timer has already expired while we were not * looking. Inject the interrupt and carry on. @@ -152,6 +176,9 @@ void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu) return; } + cval = timer->cntv_cval; + now = kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff; + ns = cyclecounter_cyc2ns(timecounter->cc, cval - now, timecounter->mask, &timecounter->frac); timer_arm(timer, ns); |