Comment 10 for bug 1851545

Reviewed: https://review.opendev.org/c/openstack/nova/+/790711
Committed: https://opendev.org/openstack/nova/commit/bf7254b794f2296cdb701a21abb9e5708c951542
Submitter: "Zuul (22348)"
Branch: stable/wallaby

commit bf7254b794f2296cdb701a21abb9e5708c951542
Author: Artom Lifshitz <email address hidden>
Date: Wed Mar 31 16:57:35 2021 -0400

    Update SRIOV port pci_slot when unshelving

    There are a few things we need to do to make that work:

    * Always set the PCIRequest's requester_id. Previously, this was only
      done for resource requests. The requester_id is the port UUID, so we
      can use that to correlate which port to update with which pci_slot
      (in the case of multiple SRIOV ports per instance).

      This has the side effect of making the fix work only for instances
      created *after* this patch has been applied. It's not ideal, but
      there does not appear to be a better way.

    * Call setup_networks_on_host() within the instance_claim context.
      This means the instance's pci_devices are updated when we call it,
      allowing us to get the pci_slot information from them.

    With the two previous changes in place, we can figure out the port's
    new pci_slot in _update_port_binding_for_instance().

    Closes: bug 1851545
    Change-Id: Icfa8c1d6e84eab758af6223a2870078685584aaa
    (cherry picked from commit 00f1d4757e503bb9807d7a8d7035c061a97db983)