Comment 5 for bug 1785123

I think it would be strongly related. I'm not sure if it's a dupe, but the solution should be considered with both in mind.

The issue in all cases is that nova implicitly asks libvirt to create the NVRAM file on instance startup but doesn't ensure that it is preserved over all the nova operations.

In this case the issue is that it's not preserved over operations which result in the instance being moved from one node to another. In bug #163344 it's not preserved over instance operations on the same node.