I wrote two changes [1] for passing down target allocations to virt drivers given we need to use them for closing some bugfix [2]
Given the Nova contributor policy is saying that the public API is not related to virt drivers, we won't support virt drivers that won't accept this new argument.
If you're a contributor that works on any out-of-tree Nova virt driver, please make sure that you modify your own two above methods.
Thanks,
-Sylvain