Comment 1 for bug 1779270

The real failure is here:

http://logs.openstack.org/34/575734/8/gate/nova-live-migration/cb90e1d/logs/subnode-2/screen-n-cpu.txt.gz?level=TRACE#_Jun_25_19_47_21_967953

Jun 25 19:47:21.967953 ubuntu-xenial-ovh-gra1-0000332530 nova-compute[4672]: ERROR nova.virt.libvirt.driver [None req-2cf5b040-9ab2-4d6d-b4a6-7d929372305e service nova] [instance: 607cb757-f381-44b4-aff9-5cafe6d2cdfe] Live Migration failure: internal error: qemu unexpectedly closed the monitor: 2018-06-25T19:47:17.020552Z qemu-system-x86_64: warning: TCG doesn't support requested feature: CPUID.01H:ECX.vmx [bit 5]
Jun 25 19:47:21.968244 ubuntu-xenial-ovh-gra1-0000332530 nova-compute[4672]: 2018-06-25T19:47:21.867441Z qemu-system-x86_64: VQ 0 size 0x80 Guest index 0x11e inconsistent with Host index 0x11f: delta 0xffff
Jun 25 19:47:21.968547 ubuntu-xenial-ovh-gra1-0000332530 nova-compute[4672]: 2018-06-25T19:47:21.867473Z qemu-system-x86_64: Failed to load virtio-blk:virtio
Jun 25 19:47:21.968763 ubuntu-xenial-ovh-gra1-0000332530 nova-compute[4672]: 2018-06-25T19:47:21.867482Z qemu-system-x86_64: error while loading state for instance 0x0 of device '0000:00:03.0/virtio-blk'
Jun 25 19:47:21.968969 ubuntu-xenial-ovh-gra1-0000332530 nova-compute[4672]: 2018-06-25T19:47:21.867569Z qemu-system-x86_64: load of migration failed: Operation not permitted: libvirtError: internal error: qemu unexpectedly closed the monitor: 2018-06-25T19:47:17.020552Z qemu-system-x86_64: warning: TCG doesn't support requested feature: CPUID.01H:ECX.vmx [bit 5]
Jun 25 19:47:22.491645 ubuntu-xenial-ovh-gra1-0000332530 nova-compute[4672]: ERROR nova.virt.libvirt.driver [None req-2cf5b040-9ab2-4d6d-b4a6-7d929372305e service nova] [instance: 607cb757-f381-44b4-aff9-5cafe6d2cdfe] Migration operation has aborted

Which is a known issue so this is a duplicate bug.