Re: [Xen-devel] Xen 4.0.0 first release candidate / graphics passthru

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Jan 21, 2010 at 09:09:35AM +0000, Jean Guyader wrote:
> 2010/1/21 Pasi Kärkkäinen <pasik@xxxxxx>:
> > On Tue, Jan 12, 2010 at 10:05:12AM +0000, Keir Fraser wrote:
> >> On 12/01/2010 09:32, "Pasi Kärkkäinen" <pasik@xxxxxx> wrote:
> >>
> >> >>> Does 4.0 include gpu passthru features? If not are there any updated
> >> >>> patches to try gpu passthru with 4.x?
> >> >>
> >> >> There is support (c/s 20144).
> >> >>
> >> >
> >> > Btw is it possible now to specify a file to load the VGA bios from?
> >> > earlier it was required to hardcode it into some header file or so.
> >>
> >> I think it is hardcoded that qemu will take a copy of the host system's 
> >> BIOS
> >> (i.e., for the primary host VGA). Other options would be easy to implement
> >> I'm sure, if someone's interested.
> >>
> >
> > I was just looking at same older mails, and it seems for example Teo En Ming
> > and others who got Xen VGA passthrough working had to copy the 
> > vgabios-pt.bin
> > to tools/firmware/vgabios/ before building Xen.
> >
> > That's not very practical..
> >
> 
> Right now the code copy the bios from 0xC0000. So if you want to pass through
> a secondary display adapter with the vga bios you are not copying the right 
> one,
> that why this hack was for.
> Surely the code could be modified to add an option to copy the bios of
> the right card.
> 

Ok, thanks for the info.

Do I remember correctly that there was a problem with copying the BIOS from 
some cards, 
or on some setups? And that's why the patch to load it from a file was made? 

-- Pasi


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