diff options
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/virtio.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/hw/virtio.c b/hw/virtio.c index 314abf8a18..bb994c9b51 100644 --- a/hw/virtio.c +++ b/hw/virtio.c @@ -700,6 +700,8 @@ static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq) { uint16_t old, new; bool v; + /* We need to expose used array entries before checking used event. */ + smp_mb(); /* Always notify when queue is empty (when feature acknowledge) */ if (((vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) && !vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx)) { |