Comment 5 for bug 1597789

FWIW, I tested this successfully with a Devstack setup:

# =================================
# OpenStack version infos
# =================================
[12:18:24 stack@qemu-src ~/devstack ] $ ./tools/info.sh
os|distro=trusty
os|vendor=Ubuntu
os|release=14.04
git|cinder|master[c9900ad]
git|devstack|master[148d0e6]
git|glance|master[9d407fe]
git|horizon|master[cf0a206]
git|keystone|master[29b7102]
git|neutron|master[7311e56]
git|nova|master[5820172]
git|requirements|master[789dd5c]
[...]

# ====================================
# Hypervisor version infos
# ====================================
[12:19:33 stack@qemu-src ~/devstack ] $ sudo virsh -c qemu:///system version
Compiled against library: libvirt 1.3.3
Using library: libvirt 1.3.3
Using API: QEMU 1.3.3
Running hypervisor: QEMU 2.7.0

# =================================
# Devstack patches
# =================================
http://paste.openstack.org/show/584815/

# ==================================
# Build environment
# ==================================
https://github.com/markuszoeller/openstack/tree/master/scripts/vagrant/libvirt-qemu-source-U1404-VB