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[melanie witt <1756118@xxxxxxxxxxxxxxxxxx>]

Marking it as High because it's a regression in Queens.

** Changed in: nova
   Importance: Undecided => High

** Changed in: nova
       Status: New => Triaged

** Also affects: nova/queens
   Importance: Undecided
       Status: New

** Changed in: nova/queens
   Importance: Undecided => High

** Changed in: nova/queens
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1756118

Title:
  No live migration on aarch64

Status in OpenStack Compute (nova):
  Triaged
Status in OpenStack Compute (nova) queens series:
  Triaged

Bug description:
  On AArch64 we use cpu_mode='host-passthrought' which should allow us
  to do live migration between compute nodes running same cpus.

  But it does not:

  -----------------------------------------------------------------------------estuary@ref-compute-2:~$ openstack server migrate --live ref-compute-1 --wait 38da6986-2f76-486d-877b-438560d7aa05
  Migration pre-check error: CPU doesn't have compatibility.

  XML error: Missing CPU model name

  Refer to http://libvirt.org/html/libvirt-libvirt-host.html#virCPUCompareResult (HTTP 400) (Request-ID: req-cea6f860-e78b-469b-9527-a703114b372b)
  -----------------------------------------------------------------------------

  virsh itself is able to live migrate between two XGene1 nodes:

  -----------------------------------------------------------------------------
  root@cb-r1-m1-c1n1:/var/log/libvirt# virsh migrate --copy-storage-all --live debian-cloud-image qemu+ssh://root@10.101.3.103/system tcp://10.101.3.103

  2018-03-15 15:15:23.217+0000: initiating migration
  2018-03-15 15:15:25.740+0000: shutting down, reason=migrated
  2018-03-15T15:15:25.741113Z qemu-system-aarch64: terminating on signal 15 from pid 573 (/usr/sbin/libvirtd)

  root@debian:/var/lib/libvirt/images# virsh list --all
   Id    Name                           State
  ----------------------------------------------------
   9     debian-cloud-image             running
  -----------------------------------------------------------------------------

  Will dig more to find out what, where and why is wrong.

  More info: https://bugzilla.redhat.com/show_bug.cgi?id=1430987

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