Comment 15 for bug 1658070

The original poster's version of Nova was 13.1.2, which is Mitaka. Therefore all the --force stuff and microversions discussion is irrelevant (since microversion 2.29 was added in Newton).

So, the bug here is the migrate routine is not accounting for a change in PCI address on the destination host and is effectively attempting to launch the workload on the destination host with the source host's PCI addresses, which clearly will not work unless, by luck, the destination host has the exact same PCI addresses and those addresses are available.

The solution is to backport the patch that Matt referred to above that fixes this issue in Newton and beyond:

 https://bugs.launchpad.net/nova/+bug/1512880

Marking this as a duplicate of 1512880.