diff options
Diffstat (limited to 'arch/x86/kvm/lapic.c')
| -rw-r--r-- | arch/x86/kvm/lapic.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index ad7fff7ad13c..61ed32cd17c1 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1262,6 +1262,34 @@ static const struct kvm_io_device_ops apic_mmio_ops = { .write = apic_mmio_write, }; +static enum hrtimer_restart apic_timer_fn(struct hrtimer *data) +{ + struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer); + struct kvm_vcpu *vcpu = ktimer->vcpu; + wait_queue_head_t *q = &vcpu->wq; + + /* + * There is a race window between reading and incrementing, but we do + * not care about potentially losing timer events in the !reinject + * case anyway. Note: KVM_REQ_PENDING_TIMER is implicitly checked + * in vcpu_enter_guest. + */ + if (ktimer->reinject || !atomic_read(&ktimer->pending)) { + atomic_inc(&ktimer->pending); + /* FIXME: this code should not know anything about vcpus */ + kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu); + } + + if (waitqueue_active(q)) + wake_up_interruptible(q); + + if (ktimer->t_ops->is_periodic(ktimer)) { + hrtimer_add_expires_ns(&ktimer->timer, ktimer->period); + return HRTIMER_RESTART; + } else + return HRTIMER_NORESTART; +} + int kvm_create_lapic(struct kvm_vcpu *vcpu) { struct kvm_lapic *apic; @@ -1285,7 +1313,7 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu) hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); - apic->lapic_timer.timer.function = kvm_timer_fn; + apic->lapic_timer.timer.function = apic_timer_fn; apic->lapic_timer.t_ops = &lapic_timer_ops; apic->lapic_timer.kvm = vcpu->kvm; apic->lapic_timer.vcpu = vcpu; |