Hi all,

Recent change in tripleo [1] configure nova rx_queue_size tx_queue_size config 
by default.
It seem that this config option breaks booting vm with SR-IOV. See [2]
The issues is because of this code [3] which configure virtio queue size if the 
in the interface xml the driver is vhost or None.
In case of SR-IOV the driver is also None and that why we get the error.
A quick fix will be adding driver=vfio to [4]
I just wonder if there are other interface in the libvirt xml which this can 
have the same issue.

[1] - 
[2] - http://paste.openstack.org/show/728666/
[3] -  https://review.openstack.org/#/c/595592/
[4] - 
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