Re: [Xen-devel] Nvidia, Xen, and Vt-d

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Sep 14, 2009 at 05:31:59PM -0400, Michael J Coss wrote:
> Tim Moore wrote:
> >Hi Michael,
> >
> >I have found that the lspci output changes once you have successfully 
> >loaded a driver against it.
> >
> >In both cases, when used by pci-stub/pciback in DomU or starting X on Dom0 
> >will make the NV card appear differently in the lspci output. 
> >I would try and use the 2.6.18 kernel with the shipped "nv" X driver - I 
> >have found this combination to be the most compatible. In the xen-unstable 
> >tree, run "make linux-2.6-xen0-build" (from memory).
> >
> >So far I have only had success with passing through the Primary display 
> >adapter, I can`t get my secondary to work.. (I dont think it`s anything to 
> >do with the models of card, more that the secondary passthru doesnt work..)
> >
> >My Pri = GTX260 (512mb+sharedmem=864mb)
> >Sec: 9500 GT (512mb)
> >
> >The main complication and issue that needs to be overcome is the support 
> >for FLR. Without this PCIe capability, the GPU cannot be reset after the 
> >DomU has initialised it. I have to perform a hard-reset of Dom0 for GPU 
> >Passthrough to work a second time.
> >
> >Tim
> >  
> Just as a follow up to this.  I decided before I go back to 2.6.18, to 
> try the open source "nv" driver instead of the proprietary ones.  It 
> started up the Xserver just fine, although performance for glxgears 
> dropped through the floor.  <100 fps on a GTX 295 with an i7 3.3Ghz 
> processor ouch.  Thanks for all the suggestions.
> 

I think 'nv' driver doesn't have any 3D acceleration.

The opensource 'nouveau' driver has (some) 3D acceleration for some
cards..

> I'm going to try working with Nvidia to see if I can get them to help 
> identify the problem, but I don't expect to get very far with that.  
> Clearly, there is a problem with how they are accessing the card.
> 

Did you google for Xen-patches for the binary/proprietary nvidia driver? 

Some people got it to work with some extra patches for the kernel
module..

-- Pasi


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