We use virsh attach-device to hot-plug vhost-user nic with the following xml:
<interface type='vhostuser'>
<mac address='52:54:01:3b:83:a5'/>
<source type='unix' path='/var/run/vhost-user/port1' mode='client'/>
<target dev='port1'/>
<model type='virtio'/>
<driver queues='4'/>
</interface>
We can successfully hot plug more than one vhost-user nics with
the same unix path ('/var/run/vhost-user/port1') which is a chardev backend.
However, only one nic attached can work, because the unix path can only pair
with
one front-end of nic. So should we do something to forbid this operation?
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