[PATCH 1/7] vhost_user: Reset vq enable flag in vu_cleanup()

[Laurent Vivier <lvivier@redhat.com>]

vu_cleanup() resets most virtqueue state (started, notification,
file descriptors) but does not reset the enable flag.  After a
QEMU disconnect and reconnect, the stale enable flag causes
vu_set_vring_enable_exec() to hit its early return check
(vq->enable == enable), skipping the threading_start_thread() call
and leaving the worker thread stopped.

Reset vq->enable to false in vu_cleanup() alongside the other
virtqueue state.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
---
 vhost_user.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/vhost_user.c b/vhost_user.c
index 9e382c21f963..8ba3949e4e9d 100644
--- a/vhost_user.c
+++ b/vhost_user.c
@@ -1083,6 +1083,7 @@ void vu_cleanup(struct vu_dev *vdev)
 		struct vu_virtq *vq = &vdev->vq[i];
 
 		vq->started = false;
+		vq->enable = false;
 		vq->notification = true;
 
 		if (vq->call_fd != -1) {
-- 
2.54.0