On Mon, Feb 01, 2021 at 05:51:09PM -0800, David Rientjes wrote: > - Handling lazy validation of guest memory through the core mm layer, > most likely involving a bit in struct page flags to track their status I'd like to not use a new bit. I think it can be adequately expressed as PageReserved, augmented with another bit (say, PG_uptodate) to indicate why it's reserved.