[Rocky] [MIPS] Instance failed to spawn: UEFINotSupported

[XiaolinZhao]

Description
===========
When I launched an instance, it failed. I got the error information in nova-compute.log, as below:
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [req-d2d99605-bacd-47d5-b996-0a326849e3d2 2a42757e3a1d46f0a1a7f6644671d0cd a2d1a82b828047a48d65f26831dc461c - default default] [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] Instance failed to spawn: UEFINotSupported: UEFI is not supported
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] Traceback (most recent call last):
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2368, in _build_resources
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] yield resources
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2132, in _build_and_run_instance
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] block_device_info=block_device_info)
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 3076, in spawn
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] mdevs=mdevs)
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 5440, in _get_guest_xml
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] context, mdevs)
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 5213, in _get_guest_config
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] root_device_name)
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4874, in _configure_guest_by_virt_type
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] raise exception.UEFINotSupported()
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c] UEFINotSupported: UEFI is not supported
2020-06-05 09:57:11.800 6569 ERROR nova.compute.manager [instance: 8148a938-dc4a-43c8-9659-20d76ba0ff1c]

Environment
===========
1. openstack version: Rocky
2. nova version: 18.1.0
3. hosts with MIPS architecture, Libvirt + KVM

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/740151

[OpenStack Infra (hudson-openstack)]

Change abandoned by Stephen Finucane (<email address hidden>) on branch: master
Review: https://review.opendev.org/740151
Reason: This has been untouched with a -1 for a number of weeks so I'm going to abandon this to keep our review queue sane. If you're still interested in this work and simply need assistance, please leave a comment here or contact us on IRC and we'll be glad to help :)