Re: ovmf / PCI passthrough impaired due to very limiting PCI64 aperture

[Gerd Hoffmann]

  Hi,

> What if then we have OVMF relying in the physbits *iff*
> "-host-phys-bits" is used

How can the guest know?

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.

> 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