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[melanie witt <1900006@xxxxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1900006

Title:
  Asking for different vGPU types is racey

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) ussuri series:
  New
Status in OpenStack Compute (nova) victoria series:
  Fix Released

Bug description:
  When testing on Victoria virtual GPUs, I wanted to have different
  types :

  [devices]
  enabled_vgpu_types = nvidia-320,nvidia-321

  [vgpu_nvidia-320]
  device_addresses = 0000:04:02.1,0000:04:02.2

  [vgpu_nvidia-321]
  device_addresses = 0000:04:02.3

  
  Unfortunately, I saw that only the first type was used.
  When restarting the nova-compute service, we got the log :
  WARNING nova.virt.libvirt.driver [None req-a23d9cb4-6554-499c-9fcf-d7f9706535ef None None] The vGPU type 'nvidia-320' was listed in '[devices] enabled_vgpu_types' but no corresponding '[vgpu_nvidia-320]' group or '[vgpu_nvidia-320] device_addresses' option was defined. Only the first type 'nvidia-320' will be used.

  
  It's due to the fact that we call _get_supported_vgpu_types() first when creating the libvirt implementation [1] while we only register the new CONF options by init_host() [2] which is called after.

  
  [1] https://github.com/openstack/nova/blob/90777d790d7c268f50851ac3e5b4e02617f5ae1c/nova/virt/libvirt/driver.py#L418

  [2]
  https://github.com/openstack/nova/blob/90777d7/nova/compute/manager.py#L1405

  A simple fix would just be to make sure we have dynamic options within
  _get_supported_vgpu_types()

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