...
These can be added to your images through the OpenStack web interface as Custom items of via the command line with openstack image set --property <property> <image-name-or-uuid> . You can add multiple items at by adding the --property flag multiple times
UEFI Boot Mode
UEFI Boot mode is faster to boot and should be reduce the likelihood of a GPU being disconnected from the VM it is attached to
Check if your image supports UEFI boot mode. The easiest way to tell is to boot the image and run df
...