[Xen-devel] Re: [Xen-users] Re: Successful PCIe Graphics VT-d Passthrough to Win32 DomU, Q35 chipset

[Alexia Benington <alexbenington@xxxxxxxxx>]

Hi,

I've tried going through Xen-unstable (as of Changeset 19400), and I
believe that the necessary code to make VGA passthrough work correctly
has not been incorporated into Xen-unstable yet.

The closest that I ever got was that DomU can detect the VGA card. I
had to disable the Cirrus or Std VGA bios loaded by hvmloader. But
DomU still can't make use of the card properly. For Windows, it shows
Error Code 10 in Device Manager. I was also expecting video output on
the monitor connected to the passed through card. However, that wasn't
the case.

-Alex

On Sun, Mar 1, 2009 at 11:49 PM, Christian Tramnitz <chris.ace@xxxxxxx> wrote:
> Hello Peter,
>
> is this still working for you with current Xen-unstable or did one of the
> recent changesets break things in your setup?
>
> I'm trying to achieve the same (on a VT-d enabled X58 board), but can't get
> the Windows domU recognize the (ATI) video card, although it works fine with
> a PCIe NIC and the on-board SAS controller...
>
> Did you have to use any additional patches to get rid of the cirrus card and
> map the VGA BIOS?
>
> Which PCI device model are you using (virtual bus, passthrough, ...)?
>
>
> Best regards,
>   Christian
>
> Peter J. van der Maas schrieb:
>>
>> I am happy to announce that I have successfully (and finally!) been able
>> to pass a PCIe graphics card via VT-d to a Windows XP HVM DomU.
>>
>>
>> About time!
>>
>>
>> Config:
>>
>> -Intel Q6600 Core 2 Quad-Core, G0 stepping (I think)
>>
>> -Intel DQ35JO Motherboard, Q35 Chipset, BIOS v.991 (1/9/09), VT and VT-d
>> enabled
>>
>> -nVidia 9500GT (for VT-d passthrough - DomU)
>>
>> -nVidia GeForce2 MX200 (Dom0 console)
>>
>> -Xen (build: xen-unstable, recent as of ~ 1/25/09 1:00AM-EST)
>>
>> -Dom0: Linux-2.6.18.8-xen (via xen-unstable.hg)
>>
>> -DomU: Windows XP (pro, sp3, 32-bit)
>>
>>
>> Once the VT-d bugs were recently corrected (thank you, xen-devel!),
>> everything went fairly smoothly.  Still very buggy yet (its xen-unstable!),
>> but overall it works.
>>
>>
>> Make sure support for the PCI-backend is compiled into the kernel (not
>> just a module) and that you have your pciback.hide options in grub
>> (late-binding may work, but I haven’t tried).
>>
>>
>> Good luck!
>>
>>
>>
>> -Peter van der Maas
>
>
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