Index: sys/dev/virtio/virtqueue.h
===================================================================
--- sys/dev/virtio/virtqueue.h
+++ sys/dev/virtio/virtqueue.h
@@ -92,7 +92,9 @@
 int	 virtqueue_size(struct virtqueue *vq);
 int	 virtqueue_nfree(struct virtqueue *vq);
 int	 virtqueue_nused(struct virtqueue *vq);
-void	 virtqueue_notify(struct virtqueue *vq);
+bool 	 vq_ring_must_notify_host(struct virtqueue *vq);
+bool 	 vq_ring_notify_host(struct virtqueue *vq);
+bool	 virtqueue_notify(struct virtqueue *vq);
 void	 virtqueue_dump(struct virtqueue *vq);
 
 int	 virtqueue_enqueue(struct virtqueue *vq, void *cookie,
Index: sys/dev/virtio/virtqueue.c
===================================================================
--- sys/dev/virtio/virtqueue.c
+++ sys/dev/virtio/virtqueue.c
@@ -134,8 +134,6 @@
 static void	vq_ring_enqueue_indirect(struct virtqueue *, void *,
 		    struct sglist *, int, int);
 static int	vq_ring_enable_interrupt(struct virtqueue *, uint16_t);
-static int	vq_ring_must_notify_host(struct virtqueue *);
-static void	vq_ring_notify_host(struct virtqueue *);
 static void	vq_ring_free_chain(struct virtqueue *, uint16_t);
 
 SDT_PROVIDER_DEFINE(virtqueue);
@@ -434,7 +432,7 @@
 	return (vq->vq_free_cnt == 0);
 }
 
-void
+bool
 virtqueue_notify(struct virtqueue *vq)
 {
 
@@ -444,6 +442,8 @@
 	if (vq_ring_must_notify_host(vq))
 		vq_ring_notify_host(vq);
 	vq->vq_queued_cnt = 0;
+	/* Unlike the Linux API, we currently never report failure. */
+	return true;
 }
 
 int
@@ -820,7 +820,7 @@
 	return (0);
 }
 
-static int
+bool
 vq_ring_must_notify_host(struct virtqueue *vq)
 {
 	uint16_t new_idx, prev_idx, event_idx, flags;
@@ -837,12 +837,13 @@
 	return ((flags & vq_gtoh16(vq, VRING_USED_F_NO_NOTIFY)) == 0);
 }
 
-static void
+bool
 vq_ring_notify_host(struct virtqueue *vq)
 {
-
+	/* TODO: return success/failure */
 	VIRTIO_BUS_NOTIFY_VQ(vq->vq_dev, vq->vq_queue_index,
 	    vq->vq_notify_offset);
+	return true;
 }
 
 static void