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[Kevin Zhao <kevin.zhao@xxxxxxxxxx>]

Public bug reported:

Background:
We'd like to setup Nova and Devstack Upstream CI. Should support launch vm via Qemu virt_type. But host-passthrough mode(default in Aarch64) doesn't work on Qemu. So we can just use "custom" and specify CPU-model.

But actually Aarch64 don't return available cpu models list from Libvirt
side. Ref:https://libvirt.org/html/libvirt-libvirt-
host.html#virConnectGetCPUModelNames

So we should use the specified ones from config file. And add default
ones to it on Aarch64.

Nova-cpu.conf:
[libvirt]
live_migration_uri = qemu+ssh://stack@%s/system
cpu_mode = custom
virt_type = qemu
cpu_model = cortex-a57


WARNING nova.virt.libvirt.driver [-] The libvirt driver is not tested on qemu/aarch64 by the OpenStack project and thus its quality can not be ensured. For more information, see: https://docs.openstack.org/nova/latest/user/support-matrix.html
WARNING nova.virt.libvirt.driver [-] Running Nova with a libvirt version less than 5.0.0 is deprecated. The required minimum version of libvirt will be raised to 5.0.0 in the next release.
WARNING nova.virt.libvirt.driver [-] Running Nova with a QEMU version less than 4.0.0 is deprecated. The required minimum version of QEMU will be raised to 4.0.0 in the next release.
ERROR oslo_service.service [-] Error starting thread.: nova.exception.InvalidCPUInfo: Configured CPU model: cortex-a57 is not correct, or your host CPU arch does not suuport this model. Please correct your config and try again.
ERROR oslo_service.service Traceback (most recent call last):
ERROR oslo_service.service   File "/usr/local/lib/python3.6/dist-packages/oslo_service/service.py", line 810, in run_service
ERROR oslo_service.service     service.start()
ERROR oslo_service.service   File "/opt/stack/nova/nova/service.py", line 158, in start
ERROR oslo_service.service     self.manager.init_host()
ERROR oslo_service.service   File "/opt/stack/nova/nova/compute/manager.py", line 1394, in init_host
ERROR oslo_service.service     self.driver.init_host(host=self.host)
ERROR oslo_service.service   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 715, in init_host
ERROR oslo_service.service     self._check_cpu_compatibility()
ERROR oslo_service.service   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 747, in _check_cpu_compatibility
ERROR oslo_service.service     raise exception.InvalidCPUInfo(msg)
ERROR oslo_service.service nova.exception.InvalidCPUInfo: Configured CPU model: cortex-a57 is not correct, or your host CPU arch does not suuport this model. Please correct your config and try again.
ERROR oslo_service.service

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1864588

Title:
  Cpu model is not correct on Aarch64/Qemu/Custom mode

Status in OpenStack Compute (nova):
  New

Bug description:
  Background:
  We'd like to setup Nova and Devstack Upstream CI. Should support launch vm via Qemu virt_type. But host-passthrough mode(default in Aarch64) doesn't work on Qemu. So we can just use "custom" and specify CPU-model.

  But actually Aarch64 don't return available cpu models list from
  Libvirt side. Ref:https://libvirt.org/html/libvirt-libvirt-
  host.html#virConnectGetCPUModelNames

  So we should use the specified ones from config file. And add default
  ones to it on Aarch64.

  Nova-cpu.conf:
  [libvirt]
  live_migration_uri = qemu+ssh://stack@%s/system
  cpu_mode = custom
  virt_type = qemu
  cpu_model = cortex-a57


  WARNING nova.virt.libvirt.driver [-] The libvirt driver is not tested on qemu/aarch64 by the OpenStack project and thus its quality can not be ensured. For more information, see: https://docs.openstack.org/nova/latest/user/support-matrix.html
  WARNING nova.virt.libvirt.driver [-] Running Nova with a libvirt version less than 5.0.0 is deprecated. The required minimum version of libvirt will be raised to 5.0.0 in the next release.
  WARNING nova.virt.libvirt.driver [-] Running Nova with a QEMU version less than 4.0.0 is deprecated. The required minimum version of QEMU will be raised to 4.0.0 in the next release.
  ERROR oslo_service.service [-] Error starting thread.: nova.exception.InvalidCPUInfo: Configured CPU model: cortex-a57 is not correct, or your host CPU arch does not suuport this model. Please correct your config and try again.
  ERROR oslo_service.service Traceback (most recent call last):
  ERROR oslo_service.service   File "/usr/local/lib/python3.6/dist-packages/oslo_service/service.py", line 810, in run_service
  ERROR oslo_service.service     service.start()
  ERROR oslo_service.service   File "/opt/stack/nova/nova/service.py", line 158, in start
  ERROR oslo_service.service     self.manager.init_host()
  ERROR oslo_service.service   File "/opt/stack/nova/nova/compute/manager.py", line 1394, in init_host
  ERROR oslo_service.service     self.driver.init_host(host=self.host)
  ERROR oslo_service.service   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 715, in init_host
  ERROR oslo_service.service     self._check_cpu_compatibility()
  ERROR oslo_service.service   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 747, in _check_cpu_compatibility
  ERROR oslo_service.service     raise exception.InvalidCPUInfo(msg)
  ERROR oslo_service.service nova.exception.InvalidCPUInfo: Configured CPU model: cortex-a57 is not correct, or your host CPU arch does not suuport this model. Please correct your config and try again.
  ERROR oslo_service.service

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