I updated both test hosts to latest raring, then added the ppa, upgraded, and confirmed with dpkg all "qemu-" packages on both hosts are "1.4.0+dfsg-1expubuntu5~ppa1". I then started my test VM, tried to migrate (shared storage) and still have the same problem.

Sending host libvirtd.log:

2013-04-03 12:25:10.562+0000: 1665: error : qemuMigrationUpdateJobStatus:1219 : operation failed: migration job: unexpectedly failed
2013-04-03 12:26:06.786+0000: 1654: error : qemuMonitorIO:602 : internal error End of file from monitor
2013-04-03 12:26:07.338+0000: 1654: warning : virAuditSend:135 : Failed to send audit message virt=kvm op=stop reason=shutdown vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c vm-pid=-1: Operation not permitted


Receiving host libvirtd.log:

2013-04-03 12:25:10.143+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c vm-ctx=libvirt-977b8f97-4db2-c54d-c269-13c448d11b8c img-ctx=libvirt-977b8f97-4db2-c54d-c269-13c448d11b8c model=apparmor: Operation not permitted
2013-04-03 12:25:10.143+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c vm-ctx=106:106 img-ctx=106:106 model=dac: Operation not permitted
2013-04-03 12:25:10.143+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=cgroup reason=deny vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c cgroup="/sys/fs/cgroup/devices/libvirt/qemu/ubuntu1/" class=all: Operation not permitted
2013-04-03 12:25:10.144+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=cgroup reason=allow vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c cgroup="/sys/fs/cgroup/devices/libvirt/qemu/ubuntu1/" class=major category=pty maj=88 acl=rw: Operation not permitted
2013-04-03 12:25:10.144+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=cgroup reason=allow vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c cgroup="/sys/fs/cgroup/devices/libvirt/qemu/ubuntu1/" class=path path=/dev/null rdev=01:03 acl=rw: Operation not permitted
2013-04-03 12:25:10.144+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=cgroup reason=allow vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c cgroup="/sys/fs/cgroup/devices/libvirt/qemu/ubuntu1/" class=path path=/dev/full rdev=01:07 acl=rw: Operation not permitted
2013-04-03 12:25:10.144+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=cgroup reason=allow vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c cgroup="/sys/fs/cgroup/devices/libvirt/qemu/ubuntu1/" class=path path=/dev/zero rdev=01:05 acl=rw: Operation not permitted
2013-04-03 12:25:10.144+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=cgroup reason=allow vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c cgroup="/sys/fs/cgroup/devices/libvirt/qemu/ubuntu1/" class=path path=/dev/random rdev=01:08 acl=rw: Operation not permitted
2013-04-03 12:25:10.144+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=cgroup reason=allow vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c cgroup="/sys/fs/cgroup/devices/libvirt/qemu/ubuntu1/" class=path path=/dev/urandom rdev=01:09 acl=rw: Operation not permitted
2013-04-03 12:25:10.144+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=cgroup reason=allow vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c cgroup="/sys/fs/cgroup/devices/libvirt/qemu/ubuntu1/" class=path path=/dev/ptmx rdev=05:02 acl=rw: Operation not permitted
2013-04-03 12:25:10.144+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=cgroup reason=allow vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c cgroup="/sys/fs/cgroup/devices/libvirt/qemu/ubuntu1/" class=path path=/dev/kvm rdev=0A:E8 acl=rw: Operation not permitted
2013-04-03 12:25:10.144+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=cgroup reason=allow vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c cgroup="/sys/fs/cgroup/devices/libvirt/qemu/ubuntu1/" class=path path=/dev/kqemu rdev=? acl=rw: Operation not permitted
2013-04-03 12:25:10.144+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=cgroup reason=allow vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c cgroup="/sys/fs/cgroup/devices/libvirt/qemu/ubuntu1/" class=path path=/dev/rtc rdev=FE:00 acl=rw: Operation not permitted
2013-04-03 12:25:10.144+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=cgroup reason=allow vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c cgroup="/sys/fs/cgroup/devices/libvirt/qemu/ubuntu1/" class=path path=/dev/hpet rdev=0A:E4 acl=rw: Operation not permitted
2013-04-03 12:25:10.170+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=net reason=open vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c net=52:54:00:5B:73:08 path="/dev/net/tun" rdev=0A:C8: Operation not permitted
2013-04-03 12:25:10.170+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=net reason=open vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c net=52:54:00:5B:73:08 path="/dev/vhost-net" rdev=0A:EE: Operation not permitted
2013-04-03 12:25:10.380+0000: 2768: warning : qemuDomainObjEnterMonitorInternal:1004 : This thread seems to be the async job owner; entering monitor without asking for a nested job is dangerous
2013-04-03 12:25:10.381+0000: 2768: warning : qemuDomainObjEnterMonitorInternal:1004 : This thread seems to be the async job owner; entering monitor without asking for a nested job is dangerous
2013-04-03 12:25:10.382+0000: 2768: warning : qemuDomainObjEnterMonitorInternal:1004 : This thread seems to be the async job owner; entering monitor without asking for a nested job is dangerous
2013-04-03 12:25:10.422+0000: 2768: warning : virCgroupMoveTask:887 : no vm cgroup in controller 3
2013-04-03 12:25:10.422+0000: 2768: warning : virCgroupMoveTask:887 : no vm cgroup in controller 4
2013-04-03 12:25:10.422+0000: 2768: warning : virCgroupMoveTask:887 : no vm cgroup in controller 6
2013-04-03 12:25:10.422+0000: 2768: warning : qemuDomainObjEnterMonitorInternal:1004 : This thread seems to be the async job owner; entering monitor without asking for a nested job is dangerous
2013-04-03 12:25:10.425+0000: 2768: warning : qemuDomainObjEnterMonitorInternal:1004 : This thread seems to be the async job owner; entering monitor without asking for a nested job is dangerous
2013-04-03 12:25:10.425+0000: 2768: warning : qemuDomainObjEnterMonitorInternal:1004 : This thread seems to be the async job owner; entering monitor without asking for a nested job is dangerous
2013-04-03 12:25:10.426+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=disk reason=start vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c old-disk="?" new-disk="/kvm/images/ubuntu1.img": Operation not permitted
2013-04-03 12:25:10.426+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=net reason=start vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c old-net=? new-net=52:54:00:5B:73:08: Operation not permitted
2013-04-03 12:25:10.426+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=mem reason=start vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c old-mem=0 new-mem=1048576: Operation not permitted
2013-04-03 12:25:10.426+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm resrc=vcpu reason=start vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c old-vcpu=0 new-vcpu=1: Operation not permitted
2013-04-03 12:25:10.426+0000: 2768: warning : virAuditSend:135 : Failed to send audit message virt=kvm op=start reason=migrated vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c vm-pid=3248: Operation not permitted
2013-04-03 12:25:10.542+0000: 2767: error : qemuMonitorIO:602 : internal error End of file from monitor
2013-04-03 12:25:10.834+0000: 2767: warning : virAuditSend:135 : Failed to send audit message virt=kvm op=stop reason=failed vm="ubuntu1" uuid=977b8f97-4db2-c54d-c269-13c448d11b8c vm-pid=-1: Operation not permitted