I just hit that bug and I might be wrong but I think the bug is critial since it prevent any precise cloud image to have
an IP address at boot time on OpenStack for example since like you said --libvirt_use_virtio_for_bridges is enabled
by default in precise.
I just hit that bug and I might be wrong but I think the bug is critial since it prevent any precise cloud image to have use_virtio_ for_bridges is enabled
an IP address at boot time on OpenStack for example since like you said --libvirt_
by default in precise.