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[Bug 1844211] [NEW] nova compute service failed to start when cpu_model_extra_flags seted

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Public bug reported:

Description
===========

The nova compute service failed to start when use libvirt drive and
cpu_model_extra_flags set.


Steps to reproduce
==================

* set [default]/compute_driver = libvirt.LibvirtDriver
* set [libvirt]/cpu_model_extra_flags = aes
* restart nova compute service


Expected result
===============

Nova compute service start correct.


Actual result
=============

Nova compute service failed to start.


Environment
===========


Logs & Configs
==============

2019-09-17 10:31:59.044 6 ERROR oslo_service.service Traceback (most recent call last):
2019-09-17 10:31:59.044 6 ERROR oslo_service.service   File "/var/lib/kolla/venv/lib/python2.7/site-packages/oslo_service/service.py", line 810, in run_service
2019-09-17 10:31:59.044 6 ERROR oslo_service.service     service.start()
2019-09-17 10:31:59.044 6 ERROR oslo_service.service   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/service.py", line 160, in start
2019-09-17 10:31:59.044 6 ERROR oslo_service.service     self.manager.init_host()
2019-09-17 10:31:59.044 6 ERROR oslo_service.service   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/compute/manager.py", line 1255, in init_host
2019-09-17 10:31:59.044 6 ERROR oslo_service.service     self.driver.init_host(host=self.host)
2019-09-17 10:31:59.044 6 ERROR oslo_service.service   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 742, in init_host
2019-09-17 10:31:59.044 6 ERROR oslo_service.service     self._check_cpu_compatibility()
2019-09-17 10:31:59.044 6 ERROR oslo_service.service   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 798, in _check_cpu_compatibility
2019-09-17 10:31:59.044 6 ERROR oslo_service.service     raise exception.InvalidCPUInfo(msg)
2019-09-17 10:31:59.044 6 ERROR oslo_service.service InvalidCPUInfo: Configured extra flag: aes it not correct, or the host CPU does not support this flag. Please correct the config and try again. Migration pre-check error: CPU doesn't have compatibility.
2019-09-17 10:31:59.044 6 ERROR oslo_service.service
2019-09-17 10:31:59.044 6 ERROR oslo_service.service internal error: Unknown CPU model x86_64
2019-09-17 10:31:59.044 6 ERROR oslo_service.service
2019-09-17 10:31:59.044 6 ERROR oslo_service.service Refer to http://libvirt.org/html/libvirt-libvirt-host.html#virCPUCompareResult
2019-09-17 10:31:59.044 6 ERROR oslo_service.service

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1844211

Title:
  nova compute service failed to start when cpu_model_extra_flags seted

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========

  The nova compute service failed to start when use libvirt drive and
  cpu_model_extra_flags set.

  
  Steps to reproduce
  ==================

  * set [default]/compute_driver = libvirt.LibvirtDriver
  * set [libvirt]/cpu_model_extra_flags = aes
  * restart nova compute service

  
  Expected result
  ===============

  Nova compute service start correct.

  
  Actual result
  =============

  Nova compute service failed to start.

  
  Environment
  ===========

  
  Logs & Configs
  ==============

  2019-09-17 10:31:59.044 6 ERROR oslo_service.service Traceback (most recent call last):
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service   File "/var/lib/kolla/venv/lib/python2.7/site-packages/oslo_service/service.py", line 810, in run_service
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service     service.start()
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/service.py", line 160, in start
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service     self.manager.init_host()
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/compute/manager.py", line 1255, in init_host
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service     self.driver.init_host(host=self.host)
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 742, in init_host
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service     self._check_cpu_compatibility()
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 798, in _check_cpu_compatibility
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service     raise exception.InvalidCPUInfo(msg)
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service InvalidCPUInfo: Configured extra flag: aes it not correct, or the host CPU does not support this flag. Please correct the config and try again. Migration pre-check error: CPU doesn't have compatibility.
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service internal error: Unknown CPU model x86_64
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service Refer to http://libvirt.org/html/libvirt-libvirt-host.html#virCPUCompareResult
  2019-09-17 10:31:59.044 6 ERROR oslo_service.service

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