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

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 <mst@redhat.com>
parent 75fd9edc

drivers/vhost/vhost.c

+2 −2
Original line number Diff line number Diff line
@@ -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;