提交 d77f873f 编写于 作者: D David S. Miller
...@@ -1035,7 +1035,12 @@ int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len) ...@@ -1035,7 +1035,12 @@ int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len)
/* This actually signals the guest, using eventfd. */ /* This actually signals the guest, using eventfd. */
void vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq) void vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq)
{ {
__u16 flags = 0; __u16 flags;
/* Flush out used index updates. This is paired
* with the barrier that the Guest executes when enabling
* interrupts. */
smp_mb();
if (get_user(flags, &vq->avail->flags)) { if (get_user(flags, &vq->avail->flags)) {
vq_err(vq, "Failed to get flags"); vq_err(vq, "Failed to get flags");
return; return;
......
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