Re: [Qemu-devel] [PATCH V7 23/24] apci: fix PXB behaviour if used with unsupported BIOS

[Marcel Apfelbaum]

On 06/01/2015 03:17 PM, Michael S. Tsirkin wrote:
> On Mon, Jun 01, 2015 at 01:40:19PM +0200, Gerd Hoffmann wrote:
> > On Mo, 2015-06-01 at 12:44 +0300, Marcel Apfelbaum wrote:
> > > On 05/31/2015 09:12 PM, Michael S. Tsirkin wrote:
> > > > On Mon, May 25, 2015 at 06:34:01PM +0300, Marcel Apfelbaum wrote:
> > > > > PXB does not work with unsupported bioses, but should
> > > > > not interfere with normal OS operation.
> > > > > We don't ship them anymore, but it's reasonable
> > > > > to keep the work-around until we update the bios in qemu.
> > > >
> > > > We already did, did we not?
> > > Yes, we did, but Gerd preferred to keep this patch around.
> > > Adding him to thread.
> >
> > seabios bundled with qemu isn't the only possible firmware.
> >
> > We have ovmf, coreboot, qboot.
>
> ovmf is especially interesting. Marcel, did you look at what
> happens with pxb and ovmf?
No, I talked to Laszlo about it, he said ovmf is not there yet.
OVMF will not query the extra buses, so the devices on the extra bus will not 
be visible.
Adding him to the thread.

Thanks,
Marcel

> > You might boot with old seabios for
> > whatever reasons (say bisecting down something).
>
> But then you won't have pxb, will you?
>
> > IMO qemu should deal
> > with pxe not being initialized by the firmware in a sensible way, for
> > robustness reasons.
> >
> > cheers,
> >    Gerd