Hi, > I see. I'll figure out the details and add a comment to this end. > > But that's for the 32 bit window - I don't see it playing > with mtrrs for the 64 bit ranges. > So I'm guessing alignment isn't needed there, right?
mtrr's are a 32bit thing anyway IIRC. I still would place the 64bit window aligned. Given that 36 physical address lines (-> 64G address space) used to be quite common until recently I think reserving 16G from 64G downwards would be a good pick. For guests with *lots* of memory we could move the hole to be just below 1T and maybe also make it larger. cheers, Gerd
