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[Bug 1854126] Re: s390x: failed to live migrate VM

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Reviewed:  https://review.opendev.org/696228
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=011cce6adb30c50737b45ec02e161fd71ab5b3e3
Submitter: Zuul
Branch:    master

commit 011cce6adb30c50737b45ec02e161fd71ab5b3e3
Author: jichenjc <jichenjc@xxxxxxxxxx>
Date:   Wed Dec 4 03:34:23 2019 +0000

    libvirt: avoid cpu check at s390x arch
    
    nova compute will call check_can_live_migrate_destination when doing
    live migration and it will compare cpu model, however, following info
    indicated that cpu compare is not supported at s390x arch.
    
    URI qemu:///system does not support full set of host capabilities: this
    function is not supported by the connection driver:
    cannot compute baseline CPU of s390x architecture
    
    https://www.libvirt.org/news.html has the info
    v5.9.0 has Improvements part indicated the compare was added at 5.9
    
    so the workaround is to avoid the check and let the migration proceed.
    
    Change-Id: I253f4f305ecf8b5331212be87caef41f2ebb747e
    Closes-Bug: 1854126


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1854126

Title:
  s390x: failed to live migrate VM

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  see following logs when doing live migration on s390s platform with
  KVM

  openstack server migrate --live kvm02 --block-migration d28caa4a-215b-
  44c8-bed0-e0e7faca07e5


  
  ogs:

  2019-10-10 12:03:25.710 19003 ERROR nova.virt.libvirt.driver [req-
  83d11ac0-3414-489e-8ad2-bfd0078e059f 44cdcb0bbe9e40fc91c043533d4dcbac
  4067c50d412549c29b2deb58ec400ea1 - default default] CPU doesn't have
  compatibility.

  XML error: Missing CPU model name

  Refer to http://libvirt.org/html/libvirt-libvirt-host.html#virCPUCompareResult: libvirtError: XML error: Missing CPU model name
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server [req-83d11ac0-3414-489e-8ad2-bfd0078e059f 44cdcb0bbe9e40fc91c043533d4dcbac 4067c50d412549c29b2deb58ec400ea1 - default default] Exception during message handling: MigrationPreCheckError: 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
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 166, in _process_incoming
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server res = self.dispatcher.dispatch(message)
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 265, in dispatch
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server return self.do_dispatch(endpoint, method, ctxt, args)
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 194, in do_dispatch
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server result = func(ctxt, **new_args)
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/nova/exception_wrapper.py", line 79, in wrapped
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server function_name, call_dict, binary, tb)
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in exit
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server self.force_reraise()
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server six.reraise(self.type, self.value, self.tb)
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/nova/exception_wrapper.py", line 69, in wrapped
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server return f(self, context, *args, **kw)
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/nova/compute/utils.py", line 1418, in decorated_function
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server return function(self, context, *args, **kwargs)
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 215, in decorated_function
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server kwargs['instance'], e, sys.exc_info())
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in exit
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server self.force_reraise()
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server six.reraise(self.type, self.value, self.tb)
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 203, in decorated_function
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server return function(self, context, *args, **kwargs)
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 6262, in check_can_live_migrate_destination
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server block_migration, disk_over_commit)
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 7205, in check_can_live_migrate_destination
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server self._compare_cpu(None, source_cpu_info, instance)
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 7452, in _compare_cpu
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server reason=m % {'ret': e, 'u': u})
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server MigrationPreCheckError: Migration pre-check error: CPU doesn't have compatibility.
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server XML error: Missing CPU model name
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server Refer to http://libvirt.org/html/libvirt-libvirt-host.html#virCPUCompareResult
  2019-10-10 12:03:25.748 19003 ERROR oslo_messaging.rpc.server

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