Have ixgbe 3.178.3.
Somehow, libvirt cant set MAC & VLAN to correct VF channel.
Example : trying to set AC to VF 0: checked and "ip link show <pf> shown, the setting was in channel VF 21.
I bet this is some ordering issue like, but can't point exact quilty.
Everything works fine with igb v4.3.
3.8.0-19-generic
-niilo-