Comment 1 for bug 1733522

For [1], this function had been merged in ocata. The ovs version and qemu version met the requirement if you want to use the vhost_user_client mode. Because this socket will be managed by qemu, it will still exist when the ovs crashes or restart.

Also I think a better approach is to use a separate directory for the vhost_user socket by configure the agent.conf

Please show/verify the configure of vm xml and ovs port.

[1] https://bugs.launchpad.net/neutron/+bug/1604924