On Tue, Dec 17, 2013 at 06:56:06PM +0100, Gerd Hoffmann wrote: > > I merged your patch but split it: q35 is separate and piix > > is separate. Would you like me to drop the q35 part then? > > If you are fine with q35 having only 2G lowmem keep it. It's safe. > > We can sort the mmconfig setup afterwards, then check if (and how) we'll > transition to 3G lowmem. Maybe we simply don't after all, with the > world moving to 64bit it doesn't matter that much whenever memory is > mapped above or below 4g. And for old 32bit guests there is always the > option to stick with piix which continues to offers up to 3.5G lowmem. > > cheers, > Gerd >
Any update here? I'm worried 2G lowmem is a bit too aggressive, PAE still exists. If we want to support old bios, one way would be to add a new register to enable 3g lowmem. Or just ignore the issue with new machine types. -- MST
