On 06/17/20 08:40, Gerd Hoffmann wrote: > Hi, > >> What if then we have OVMF relying in the physbits *iff* >> "-host-phys-bits" is used > > How can the guest know?
Exactly! > Adding "you can trust physbits" bits somewhere (as suggested by Eduardo) > would work for sure, but would depend on a qemu update. > > Maybe a "don't trust physbits in case it is 40" heuristic works well > enough in practice. ... for how many years? ;) No heuristics please. (I absolutely prefer X-PciMmio64Mb to guesswork. With X-PciMmio64Mb, users at least know they have to be careful. I know they don't like that, they just want a promise "it will work forever", but it's not randomly called "experimental", we're not there just yet.) Thank you, Laszlo >> Now, regarding the problem "to trust or not" in the guests' physbits, >> I think it's an orthogonal discussion to some extent. > > It isn't. OVMF can't ignore the problem, you risk to break guests if > you do. > > take care, > Gerd >
