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diff --git a/sys/dev/virtio/virtqueue.c b/sys/dev/virtio/virtqueue.c
--- a/sys/dev/virtio/virtqueue.c
+++ b/sys/dev/virtio/virtqueue.c
@@ -565,6 +565,9 @@
/* Ensure updated avail->idx is visible to host. */
bus_dmamap_sync(vq->vq_ring_dmat, vq->vq_ring_mapp,
BUS_DMASYNC_PREWRITE);
+#if defined(__i386__) || defined(__amd64__)
+ mb();
+#endif
if (vq_ring_must_notify_host(vq))
vq_ring_notify_host(vq);
@@ -960,6 +963,9 @@
bus_dmamap_sync(vq->vq_ring_dmat, vq->vq_ring_mapp,
BUS_DMASYNC_PREWRITE);
+#if defined(__i386__) || defined(__amd64__)
+ mb();
+#endif
/*
* Enough items may have already been consumed to meet our threshold

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