Re: Xen 4.0.0 first release candidate / graphics passthru

[Jean Guyader <jean.guyader@gmail.com>]

2010/1/21 Pasi Kärkkäinen <pasik@iki.fi>:
> On Thu, Jan 21, 2010 at 09:09:35AM +0000, Jean Guyader wrote:
>> 2010/1/21 Pasi Kärkkäinen <pasik@iki.fi>:
>> > On Tue, Jan 12, 2010 at 10:05:12AM +0000, Keir Fraser wrote:
>> >> On 12/01/2010 09:32, "Pasi Kärkkäinen" <pasik@iki.fi> 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?
>

Yes, I think that was because of that, and I'm not sure about the
intel IGD but I think that was causing some issue.
The code could have a cleanup and use sysfs to get the rombios, if I
works with the intel graphic card I think we should do that.

Jean