This bug has been copied from bug #866388 and has been proposed to be backported to 6.3 z-stream (EUS).
Moving to POST: http://post-office.corp.redhat.com/archives/rhvirt-patches/2012-November/msg00079.html
verified on libvirt-0.9.10-21.el6_3.6
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2012-1484.html