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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 16:17:45 +0200
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Hi,

Yep, I used a free-dos USB stick for that. That brought back memories! ;-)
I tried several kernels, none work fine. And then there is also the netback_uevent issue, which makes me reboot dom0 in order to reboot a domU. Very annoying!
Can you post your kernel version and config?
What chipset/gfx card do you use?

regards,
Helmut

On 04.06.2010 16:09, Tobias Geiger wrote:
Hi,

i never tried passing vga through to a linux domU, sorry.
but with winxp i have no stability problems whatsoever - which may back up
your suggestions that either your xen/kernel combo is unstable or your
hardware is.

did you read out the vgabios for qemu-dm correctly (vgabios-pt.bin) ?

Greetings
tobias

Am Freitag 04 Juni 2010 15:07:55 schrieb Helmut Wieser:
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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