Hello Weidong,
Hmm I guess I have missed something, are all other (IGD etc.) VGA passthrough
patches allready merged in 4.0.0-rc1 ?
And should it work then with both 2.6.31.6-pvops and 2.6.18.8-xen dom0 ?
--
Sander
Thursday, January 21, 2010, 11:24:29 AM, you wrote:
> Pasi Kärkkäinen wrote:
>> On Thu, Jan 21, 2010 at 05:52:15PM +0800, Weidong Han wrote:
>>
>>> Jean Guyader wrote:
>>>
>>>> 2010/1/21 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?
>>>>>
>>>>>
>>>>>
>>>> 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
>>>>
>>>>
>>> vbios copied from 0xC0000 doesn't work for some graphics cards, e.g.
>>> Nvidia GS 8400, due to the vbios code is modified after initialization.
>>> So it needs to load it from file. yes, it's not practical, Intel IGD
>>> cards don't have this issue in our tests. One possible good solution is
>>> to load vbios from expansion ROM of graphics cards, but we found
>>> expansion ROM address are invalid for some graphics cards, even using
>>> Linux upstream. It needs to look into Linux code.
>>>
>>>
>>
>> So at this point should be add two things:
>>
>> 1) option in guest cfgfile telling from which card to copy the vbios from
>>
> I think adding an option in guest config file to indicate primary or
> secondary gfx assignment can cover this.
>> 2) option to load the vbios from a file specified in guest cfgfile
>>
> I don't prefer this. It involves much manual work for users. It's better
> to find a general solution which is also easy to use.
> Regards,
> Weidong
>> How does that sound like?
>>
>> -- Pasi
>>
>>
--
Best regards,
Sander mailto:linux@xxxxxxxxxxxxxx
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