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[李亚冲 <2097729@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

There are two places where pci_requests are recorded:
nova_api.request_specs and nova.intance_extras.

In cold migrate actions, when it started,  the dest host will refresh
ResourceTracker. However, in the move_claim function of the
ResourceTracker, flavor.pci_affinity_policy will not be used, This will
ultimately result in the numa_policy in the pci_requests of
'nova.instance_extras' being reset to legacy

```python 
# get pci_affinity_policy in flaovr 
pci_affinity_policy = new_instance_type.get('extra_specs', {}).get('hw:pci_numa_affinity_policy')

LOG.info("lyc _move_claim pci_affinity_policy:%s", pci_affinity_policy)

# Pass pci_affinity_policy as a parameter to the function
new_pci_requests = pci_request.get_pci_requests_from_flavor(new_instance_type, affinity_policy=pci_affinity_policy)

```

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: cold-migration numa pci

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https://bugs.launchpad.net/bugs/2097729

Title:
  Pci_requests numa_policy lost due to cold migration

Status in OpenStack Compute (nova):
  New

Bug description:
  There are two places where pci_requests are recorded:
  nova_api.request_specs and nova.intance_extras.

  In cold migrate actions, when it started,  the dest host will refresh
  ResourceTracker. However, in the move_claim function of the
  ResourceTracker, flavor.pci_affinity_policy will not be used, This
  will ultimately result in the numa_policy in the pci_requests of
  'nova.instance_extras' being reset to legacy

  ```python 
  # get pci_affinity_policy in flaovr 
  pci_affinity_policy = new_instance_type.get('extra_specs', {}).get('hw:pci_numa_affinity_policy')

  LOG.info("lyc _move_claim pci_affinity_policy:%s",
  pci_affinity_policy)

  # Pass pci_affinity_policy as a parameter to the function
  new_pci_requests = pci_request.get_pci_requests_from_flavor(new_instance_type, affinity_policy=pci_affinity_policy)

  ```

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