diff options
| -rw-r--r-- | arch/arm/kvm/arm.c | 3 | ||||
| -rw-r--r-- | virt/kvm/arm/arch_timer.c | 53 |
2 files changed, 42 insertions, 14 deletions
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 0ecd6cf362fc..21c493a9e5c9 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -300,7 +300,8 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) { - return kvm_timer_should_fire(vcpu_vtimer(vcpu)); + return kvm_timer_should_fire(vcpu_vtimer(vcpu)) || + kvm_timer_should_fire(vcpu_ptimer(vcpu)); } void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c index 7f9a66419991..0ea745290871 100644 --- a/virt/kvm/arm/arch_timer.c +++ b/virt/kvm/arm/arch_timer.c @@ -118,6 +118,35 @@ static u64 kvm_timer_compute_delta(struct arch_timer_context *timer_ctx) return 0; } +static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx) +{ + return !(timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_IT_MASK) && + (timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_ENABLE); +} + +/* + * Returns the earliest expiration time in ns among guest timers. + * Note that it will return 0 if none of timers can fire. + */ +static u64 kvm_timer_earliest_exp(struct kvm_vcpu *vcpu) +{ + u64 min_virt = ULLONG_MAX, min_phys = ULLONG_MAX; + struct arch_timer_context *vtimer = vcpu_vtimer(vcpu); + struct arch_timer_context *ptimer = vcpu_ptimer(vcpu); + + if (kvm_timer_irq_can_fire(vtimer)) + min_virt = kvm_timer_compute_delta(vtimer); + + if (kvm_timer_irq_can_fire(ptimer)) + min_phys = kvm_timer_compute_delta(ptimer); + + /* If none of timers can fire, then return 0 */ + if ((min_virt == ULLONG_MAX) && (min_phys == ULLONG_MAX)) + return 0; + + return min(min_virt, min_phys); +} + static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt) { struct arch_timer_cpu *timer; @@ -132,7 +161,7 @@ static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt) * PoV (NTP on the host may have forced it to expire * early). If we should have slept longer, restart it. */ - ns = kvm_timer_compute_delta(vcpu_vtimer(vcpu)); + ns = kvm_timer_earliest_exp(vcpu); if (unlikely(ns)) { hrtimer_forward_now(hrt, ns_to_ktime(ns)); return HRTIMER_RESTART; @@ -142,12 +171,6 @@ static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt) return HRTIMER_NORESTART; } -static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx) -{ - return !(timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_IT_MASK) && - (timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_ENABLE); -} - bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx) { u64 cval, now; @@ -215,26 +238,30 @@ void kvm_timer_schedule(struct kvm_vcpu *vcpu) { struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; struct arch_timer_context *vtimer = vcpu_vtimer(vcpu); + struct arch_timer_context *ptimer = vcpu_ptimer(vcpu); BUG_ON(timer_is_armed(timer)); /* - * No need to schedule a background timer if the guest timer has + * No need to schedule a background timer if any guest timer has * already expired, because kvm_vcpu_block will return before putting * the thread to sleep. */ - if (kvm_timer_should_fire(vtimer)) + if (kvm_timer_should_fire(vtimer) || kvm_timer_should_fire(ptimer)) return; /* - * If the timer is not capable of raising interrupts (disabled or + * If both timers are not capable of raising interrupts (disabled or * masked), then there's no more work for us to do. */ - if (!kvm_timer_irq_can_fire(vtimer)) + if (!kvm_timer_irq_can_fire(vtimer) && !kvm_timer_irq_can_fire(ptimer)) return; - /* The timer has not yet expired, schedule a background timer */ - timer_arm(timer, kvm_timer_compute_delta(vtimer)); + /* + * The guest timers have not yet expired, schedule a background timer. + * Set the earliest expiration time among the guest timers. + */ + timer_arm(timer, kvm_timer_earliest_exp(vcpu)); } void kvm_timer_unschedule(struct kvm_vcpu *vcpu) |
