Comment 7 for bug 1804502

@inbar stoberg
i was not disqualifying it as invalid because i did not like the proposed change.
i marked it as invalid as in place rebuild for instance with a numa toplogy has never
been supported so this is a new feature not a bug.

the numa topogy filter works by delegating to the nova.virt.hardware.py to calculate
a new cpu and memory assiginment for an instance on a given host. if the hardware module
is able to calualted an assignemnt give the constratits of the image and flaovr then
the filter reports the host passes.

the hardware module does not have the concept of a rebuild so it always calulates the assignment
as if it was a new instance. to make the filter work in an inplace rebuild case woudl require
the hardware module to be extended to be able to revalidate the exstitng assignment in the resouce track.

@david hill
ack it is but it is something that has never been supported so its not a bug.
that said your could work but i have left a review pointing out that you are checking the wrong
image properties. if you generalise your approch to check all image properties that start with
hw_numa and hw_cpu + hw_mem_page_size it might be workable.