X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=arch%2Fx86%2Fkvm%2Fi8254.c;h=e665d1c623ca04f45444daf5324e6c6d6477612d;hb=cc6e462cd54e64858ea25816df87d033229efe56;hp=c0f7872a9124873ac9c01937bd4400ca2f3fe47b;hpb=622395a9e63bf87a16faecf555ed02375cbae5b7;p=safe%2Fjmp%2Flinux-2.6

diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index c0f7872..e665d1c 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -200,13 +200,14 @@ static int __pit_timer_fn(struct kvm_kpit_state *ps)
 
 	if (!atomic_inc_and_test(&pt->pending))
 		set_bit(KVM_REQ_PENDING_TIMER, &vcpu0->requests);
-	if (vcpu0 && waitqueue_active(&vcpu0->wq)) {
-		vcpu0->arch.mp_state = KVM_MP_STATE_RUNNABLE;
+
+	if (vcpu0 && waitqueue_active(&vcpu0->wq))
 		wake_up_interruptible(&vcpu0->wq);
-	}
 
-	pt->timer.expires = ktime_add_ns(pt->timer.expires, pt->period);
-	pt->scheduled = ktime_to_ns(pt->timer.expires);
+	hrtimer_add_expires_ns(&pt->timer, pt->period);
+	pt->scheduled = hrtimer_get_expires_ns(&pt->timer);
+	if (pt->period)
+		ps->channels[0].count_load_time = hrtimer_get_expires(&pt->timer);
 
 	return (pt->period == 0 ? 0 : 1);
 }
@@ -215,12 +216,22 @@ int pit_has_pending_timer(struct kvm_vcpu *vcpu)
 {
 	struct kvm_pit *pit = vcpu->kvm->arch.vpit;
 
-	if (pit && vcpu->vcpu_id == 0 && pit->pit_state.inject_pending)
+	if (pit && vcpu->vcpu_id == 0 && pit->pit_state.irq_ack)
 		return atomic_read(&pit->pit_state.pit_timer.pending);
-
 	return 0;
 }
 
+static void kvm_pit_ack_irq(struct kvm_irq_ack_notifier *kian)
+{
+	struct kvm_kpit_state *ps = container_of(kian, struct kvm_kpit_state,
+						 irq_ack_notifier);
+	spin_lock(&ps->inject_lock);
+	if (atomic_dec_return(&ps->pit_timer.pending) < 0)
+		atomic_inc(&ps->pit_timer.pending);
+	ps->irq_ack = 1;
+	spin_unlock(&ps->inject_lock);
+}
+
 static enum hrtimer_restart pit_timer_fn(struct hrtimer *data)
 {
 	struct kvm_kpit_state *ps;
@@ -246,7 +257,7 @@ void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu)
 
 	timer = &pit->pit_state.pit_timer.timer;
 	if (hrtimer_cancel(timer))
-		hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
+		hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
 }
 
 static void destroy_pit_timer(struct kvm_kpit_timer *pt)
@@ -255,8 +266,9 @@ static void destroy_pit_timer(struct kvm_kpit_timer *pt)
 	hrtimer_cancel(&pt->timer);
 }
 
-static void create_pit_timer(struct kvm_kpit_timer *pt, u32 val, int is_period)
+static void create_pit_timer(struct kvm_kpit_state *ps, u32 val, int is_period)
 {
+	struct kvm_kpit_timer *pt = &ps->pit_timer;
 	s64 interval;
 
 	interval = muldiv64(val, NSEC_PER_SEC, KVM_PIT_FREQ);
@@ -268,6 +280,7 @@ static void create_pit_timer(struct kvm_kpit_timer *pt, u32 val, int is_period)
 	pt->period = (is_period == 0) ? 0 : interval;
 	pt->timer.function = pit_timer_fn;
 	atomic_set(&pt->pending, 0);
+	ps->irq_ack = 1;
 
 	hrtimer_start(&pt->timer, ktime_add_ns(ktime_get(), interval),
 		      HRTIMER_MODE_ABS);
@@ -302,11 +315,11 @@ static void pit_load_count(struct kvm *kvm, int channel, u32 val)
 	case 1:
         /* FIXME: enhance mode 4 precision */
 	case 4:
-		create_pit_timer(&ps->pit_timer, val, 0);
+		create_pit_timer(ps, val, 0);
 		break;
 	case 2:
 	case 3:
-		create_pit_timer(&ps->pit_timer, val, 1);
+		create_pit_timer(ps, val, 1);
 		break;
 	default:
 		destroy_pit_timer(&ps->pit_timer);
@@ -520,7 +533,7 @@ void kvm_pit_reset(struct kvm_pit *pit)
 	mutex_unlock(&pit->pit_state.lock);
 
 	atomic_set(&pit->pit_state.pit_timer.pending, 0);
-	pit->pit_state.inject_pending = 1;
+	pit->pit_state.irq_ack = 1;
 }
 
 struct kvm_pit *kvm_create_pit(struct kvm *kvm)
@@ -532,8 +545,17 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm)
 	if (!pit)
 		return NULL;
 
+	mutex_lock(&kvm->lock);
+	pit->irq_source_id = kvm_request_irq_source_id(kvm);
+	mutex_unlock(&kvm->lock);
+	if (pit->irq_source_id < 0) {
+		kfree(pit);
+		return NULL;
+	}
+
 	mutex_init(&pit->pit_state.lock);
 	mutex_lock(&pit->pit_state.lock);
+	spin_lock_init(&pit->pit_state.inject_lock);
 
 	/* Initialize PIO device */
 	pit->dev.read = pit_ioport_read;
@@ -555,6 +577,9 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm)
 	pit_state->pit = pit;
 	hrtimer_init(&pit_state->pit_timer.timer,
 		     CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+	pit_state->irq_ack_notifier.gsi = 0;
+	pit_state->irq_ack_notifier.irq_acked = kvm_pit_ack_irq;
+	kvm_register_irq_ack_notifier(kvm, &pit_state->irq_ack_notifier);
 	mutex_unlock(&pit->pit_state.lock);
 
 	kvm_pit_reset(pit);
@@ -570,6 +595,7 @@ void kvm_free_pit(struct kvm *kvm)
 		mutex_lock(&kvm->arch.vpit->pit_state.lock);
 		timer = &kvm->arch.vpit->pit_state.pit_timer.timer;
 		hrtimer_cancel(timer);
+		kvm_free_irq_source_id(kvm, kvm->arch.vpit->irq_source_id);
 		mutex_unlock(&kvm->arch.vpit->pit_state.lock);
 		kfree(kvm->arch.vpit);
 	}
@@ -577,12 +603,29 @@ void kvm_free_pit(struct kvm *kvm)
 
 static void __inject_pit_timer_intr(struct kvm *kvm)
 {
+	struct kvm_vcpu *vcpu;
+	int i;
+
 	mutex_lock(&kvm->lock);
-	kvm_ioapic_set_irq(kvm->arch.vioapic, 0, 1);
-	kvm_ioapic_set_irq(kvm->arch.vioapic, 0, 0);
-	kvm_pic_set_irq(pic_irqchip(kvm), 0, 1);
-	kvm_pic_set_irq(pic_irqchip(kvm), 0, 0);
+	kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 1);
+	kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 0);
 	mutex_unlock(&kvm->lock);
+
+	/*
+	 * Provides NMI watchdog support via Virtual Wire mode.
+	 * The route is: PIT -> PIC -> LVT0 in NMI mode.
+	 *
+	 * Note: Our Virtual Wire implementation is simplified, only
+	 * propagating PIT interrupts to all VCPUs when they have set
+	 * LVT0 to NMI delivery. Other PIC interrupts are just sent to
+	 * VCPU0, and only if its LVT0 is in EXTINT mode.
+	 */
+	if (kvm->arch.vapics_in_nmi_mode > 0)
+		for (i = 0; i < KVM_MAX_VCPUS; ++i) {
+			vcpu = kvm->vcpus[i];
+			if (vcpu)
+				kvm_apic_nmi_wd_deliver(vcpu);
+		}
 }
 
 void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu)
@@ -592,37 +635,19 @@ void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu)
 	struct kvm_kpit_state *ps;
 
 	if (vcpu && pit) {
+		int inject = 0;
 		ps = &pit->pit_state;
 
-		/* Try to inject pending interrupts when:
-		 * 1. Pending exists
-		 * 2. Last interrupt was accepted or waited for too long time*/
-		if (atomic_read(&ps->pit_timer.pending) &&
-		    (ps->inject_pending ||
-		    (jiffies - ps->last_injected_time
-				>= KVM_MAX_PIT_INTR_INTERVAL))) {
-			ps->inject_pending = 0;
-			__inject_pit_timer_intr(kvm);
-			ps->last_injected_time = jiffies;
-		}
-	}
-}
-
-void kvm_pit_timer_intr_post(struct kvm_vcpu *vcpu, int vec)
-{
-	struct kvm_arch *arch = &vcpu->kvm->arch;
-	struct kvm_kpit_state *ps;
-
-	if (vcpu && arch->vpit) {
-		ps = &arch->vpit->pit_state;
-		if (atomic_read(&ps->pit_timer.pending) &&
-		(((arch->vpic->pics[0].imr & 1) == 0 &&
-		  arch->vpic->pics[0].irq_base == vec) ||
-		  (arch->vioapic->redirtbl[0].fields.vector == vec &&
-		  arch->vioapic->redirtbl[0].fields.mask != 1))) {
-			ps->inject_pending = 1;
-			atomic_dec(&ps->pit_timer.pending);
-			ps->channels[0].count_load_time = ktime_get();
+		/* Try to inject pending interrupts when
+		 * last one has been acked.
+		 */
+		spin_lock(&ps->inject_lock);
+		if (atomic_read(&ps->pit_timer.pending) && ps->irq_ack) {
+			ps->irq_ack = 0;
+			inject = 1;
 		}
+		spin_unlock(&ps->inject_lock);
+		if (inject)
+			__inject_pit_timer_intr(kvm);
 	}
 }