This bug has been copied from bug #866999 and has been proposed to be backported to 6.3 z-stream (EUS).
Sent for review: http://post-office.corp.redhat.com/archives/rhvirt-patches/2012-October/msg01258.html
Verified on libvirt-0.9.10-21.el6_3.6.x86_64 (rhel6.3). The VM's xml given by "virsh capabilities" now contains the cpu topology: <capabilities> <host> <uuid>067f8a8b-5ab3-413c-aa37-945854bf102e</uuid> <cpu> <arch>x86_64</arch> <topology sockets='1' cores='1' threads='1'/> </cpu> <power_management> <suspend_disk/> </power_management> <migration_features> <live/> <uri_transports> <uri_transport>tcp</uri_transport> </uri_transports> </migration_features> <topology> <cells num='1'> <cell id='0'> <cpus num='1'> <cpu id='0'/> </cpus> </cell> </cells> </topology> <secmodel> <model>selinux</model> <doi>0</doi> </secmodel> </host> </capabilities>
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