Heya, If this Libvirt bug[1] is blocking you from getting Nova Compute service start, there's a yet-to-be reviewed patch upstream libvirt[2], I made a scratch build w/ that fix here(*only for testing*, official build will be made once the fix is in the upstream libvirt maintenance branches): http://koji.fedoraproject.org/koji/taskinfo?taskID=6462663 I tested it on my IceHouse, Fedora-20 setup and the said bug is fixed, for me. Once you apply the RPMs, restart libvirtd and Compute service: $ systemctl restart libvirtd $ systemctl restart openstack-nova-compute Ensure Compute service cam up sanely: $ systemctl status openstack-nova-compute [1] https://bugzilla.redhat.com/show_bug.cgi?id=1049391 -- openstack-nova-compute service fails with - libvirtError: internal error: CPU feature `avx' specified more than once [2] https://www.redhat.com/archives/libvir-list/2014-January/msg01313.html -- /kashyap