Commit b834226b authored by Michael S. Tsirkin's avatar Michael S. Tsirkin

vhost: optimize interrupt enable/disable

As we now only update used ring after enabling
the backend, we can write flags with __put_user:
as that's done on data path, it matters.
Signed-off-by: default avatarMichael S. Tsirkin <>
parent 75fd9edc
......@@ -998,7 +998,7 @@ int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log,
static int vhost_update_used_flags(struct vhost_virtqueue *vq)
void __user *used;
if (put_user(vq->used_flags, &vq->used->flags) < 0)
if (__put_user(vq->used_flags, &vq->used->flags) < 0)
return -EFAULT;
if (unlikely(vq->log_used)) {
/* Make sure the flag is seen before log. */
......@@ -1016,7 +1016,7 @@ static int vhost_update_used_flags(struct vhost_virtqueue *vq)
static int vhost_update_avail_event(struct vhost_virtqueue *vq, u16 avail_event)
if (put_user(vq->avail_idx, vhost_avail_event(vq)))
if (__put_user(vq->avail_idx, vhost_avail_event(vq)))
return -EFAULT;
if (unlikely(vq->log_used)) {
void __user *used;
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