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[Uggla <2103636@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

A bug occurs when a user requests a live migration with a flavor-based
request that includes NUMA constraints (e.g., CPU affinity). The
migration process hits the _test_pci() method, which incorrectly
enforces a restriction allowing only port-based requests, causing the
migration to fail unnecessarily.

Expected Behavior:

Live migration should succeed for flavor-based requests with NUMA
constraints, as these are now supported.

Actual Behavior:

Live migration fails due to the _test_pci() method, which wrongly
rejects flavor-based requests under the assumption that only port-based
requests are valid.

Steps to Reproduce:

    Create an instance with a flavor-based request that includes NUMA constraints (e.g., CPU affinity).
    Initiate a live migration.
    Observe that the migration fails at the _test_pci() method due to an unnecessary restriction.

Root Cause:

    The _test_pci() check is redundant as a similar verification is already performed earlier in the migration process.
    The check incorrectly assumes that only port-based requests should pass, while flavor-based requests should also be allowed.

Proposed Fix:

    Remove the _test_pci() method, as it is no longer necessary.
    Ensure that functional tests cover mixed-mode scenarios (port-based + flavor-based requests) to prevent regressions.

** Affects: nova
     Importance: High
     Assignee: Uggla (rene-ribaud)
         Status: Confirmed

** Changed in: nova
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/2103636

Title:
  Live Migration Fails for Flavor-Based Requests with NUMA Constraints
  Due to Redundant PCI Check

Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  A bug occurs when a user requests a live migration with a flavor-based
  request that includes NUMA constraints (e.g., CPU affinity). The
  migration process hits the _test_pci() method, which incorrectly
  enforces a restriction allowing only port-based requests, causing the
  migration to fail unnecessarily.

  Expected Behavior:

  Live migration should succeed for flavor-based requests with NUMA
  constraints, as these are now supported.

  Actual Behavior:

  Live migration fails due to the _test_pci() method, which wrongly
  rejects flavor-based requests under the assumption that only port-
  based requests are valid.

  Steps to Reproduce:

      Create an instance with a flavor-based request that includes NUMA constraints (e.g., CPU affinity).
      Initiate a live migration.
      Observe that the migration fails at the _test_pci() method due to an unnecessary restriction.

  Root Cause:

      The _test_pci() check is redundant as a similar verification is already performed earlier in the migration process.
      The check incorrectly assumes that only port-based requests should pass, while flavor-based requests should also be allowed.

  Proposed Fix:

      Remove the _test_pci() method, as it is no longer necessary.
      Ensure that functional tests cover mixed-mode scenarios (port-based + flavor-based requests) to prevent regressions.

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