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[Balazs Gibizer <1881557@xxxxxxxxxxxxxxxxxx>]

Which nova version you used where cold migrate worked for the same host?
By looking at the code I think since Liberty the libvirt driver
explicitly state it does not support cold migration to the same host
[1]. Also I'm not sure what would be the reason to migrate an instance
to the same host with libvirt. (In VMware where a single compute host
manages multiple hypervisors it could make sense).

In the other hand resize to same host supported with libvirt driver and
works for me in a fresh devstack.

I'm marking this bug Invalid cold migrate to the same host is not
supported by libvirt driver. Please set it back to New if you disagree.

[1] https://review.opendev.org/#/c/118604/20/nova/virt/libvirt/driver.py

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

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https://bugs.launchpad.net/bugs/1881557

Title:
  Can not resize to same host for libvirt driver

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Description
  ===========
  As before, the instance can be resized or cold-migrated to same host for libvirt driver
  if CONF.allow_resize_to_same_host was set to true.
  When use latest source, got error "UnableToMigrateToSelf: Unable to migrate instance".

  Steps to reproduce
  ==================
  * Configure CONF.allow_resize_to_same_host to true
  * Create one instance
  * Cold-migrate the instance

  Expected result
  ===============
  The instance can be cold-migrated on same host

  Actual result
  =============
  Got error "UnableToMigrateToSelf: Unable to migrate instance"

  Environment
  ===========
  $ git log
  commit f571151e79dbd87a76ae3222a9f5b507d85648b1
  Merge: 3233392 236f1b2
  Author: Zuul <zuul@xxxxxxxxxxxxxxxxxx>
  Date:   Sat May 30 06:55:18 2020 +0000

      Merge "zuul: Make devstack-plugin-ceph-tempest-py3 a voting check
  job again"

  libvirt + KVM

  Logs & Configs
  ==============
  [DEFAULT]
  allow_resize_to_same_host = true

  nova-compute
  2020-06-01 06:53:24.367 28545 ERROR nova.compute.manager [instance: 982f9273-eb50-443a-8bbc-fa728ceac8e4] UnableToMigrateToSelf: Unable to migrate instance (982f9273-eb50-443a-8bbc-fa728ceac8e4) to current host (compute04).

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