Re: [Xen-devel] VGA passthrough nVidia NVS 295

[Tobias Geiger <tobias.geiger@xxxxxxxxx>]

Hi Helmut,

i had the same experience with my setup regarding windows7.
The good news is, there are no such problems with winxp.

Disabling the "Timeout Detection and Recovery (TDR)" Feature in the win7 
registry doesn't help for my nvlddmkm.sys BSOD, but if i interpret the 
countless google hits regarding  "nvlddmkm.sys 0x00000116" (the Error-Code 
that always appears in the win7 BSOD - is yours also always the same?), it's 
hard to come to a solution: 
Some say its a driver-issue, memory timings, powersupply unit... OTOH it may 
be that Windows 7 is using a feature winxp doesnt, and which doesn't get 
passed through correctly.


Greetings
Tobias

Am Mittwoch 02 Juni 2010 13:04:10 schrieb Helmut Wieser:
> I want to try to get VGA passthrough working in a Windows 7 x64 domU.
> I'm running debian squeeze/testing/unstable with Jeremy's 2.6.32.x kernel.
> The best I got to work is the device showing up under Windows 7, with
> all resources and whatnot.
> 
> I've applied the vga-loadbios patch and vBAR-pBAR patch to xen, and the
> vBAR-pBAR patch to qemu-dm.
> 
> This behaviour isn't stable though. Sometimes I can log on and then domU
> crashes with a BSoD (nvlddmkm.sys). Sometimes I can log on and actually
> do something. But certain operations, like changing display options or
> checking device manager details cause a BSoD.
> 
> The NVS 295 is based on a G98, which isn't to dissimilar from Eming's
> GeForce 8400GS. He only states he used 2.6.30-rc3 with some upstream
> patches, but not more.
> 
> Has anyone succeeded in passing thru an nVidia graphics card to a
> Windows 7 x64 guest?
> Should I try Windows XP, would that make a difference?
> 
> regards,
> Helmut
> 
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> 

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