Comment 1 for bug 1745073

While I understand your concern about eventually making sure that the live-migration is done, guessing whether libvirtd is done for migrating is really difficult. Nova tries to look at how many memory bytes are left to be migrated but sometimes it can be wrong.

There are also a lot of config opts for live-migration that could help you, like trying to enable post-copy.

Leaving that bug as a Wontfix/Wishlist but please provide a blueprint if you really think Nova should be modified and how to do.