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

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Subject: Re: [Xen-devel] VGA passthrough nVidia NVS 295
From: Helmut Wieser <helmut.wieser@xxxxxxxx>
Date: Fri, 04 Jun 2010 15:07:55 +0200
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Hi Tobias,

Yes, I get the exact same error. Googling didn't reveal much. I don't get this error in Windows XP though, but I do get other issues. None are concise, so I think my Xen / Kernel version combo is unstable, or my hardware is. I'm running on a Intel 5520 chipset with dual E5620 Xeon and a Nvidia Quadro NVS 295, G98.

Were you more successful in passing through to a Linux domU?

The chipsets and CPUs are well supported, only the graphics card didn't show up anywhere.

regards,
Helmut


On 03.06.2010 15:47, Tobias Geiger wrote:
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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