> > The one bit that is odd is the cpa->pfn field - for unmapped pages > > that's totally uninteresting and I'm wondering whether setting it to 0 > > wouldn't be better. > > > > Does the CPU _ever_ look look at the PFN if the page is > > !_PAGE_PRESENT, for example speculatively? If yes then what is the > > recommended value for the pfn - zero perhaps? > > > > This is L1TF, right? Isn't all ones the recommended value? > > I would love to see EFI start treating its mm just like any other mm at some > point, though. That is, it should not modify any mappings in the kernel range, > and it could use the regular mm modification APIs for the user range. But maybe > this is a pipe dream. Sounds good to me. I have some more fixes for EFI code and as soon as they are done, I will start looking into this. Regards, Sai
