Re: [Xen-users] Nvidia: card fails to work in EITHER dom0 or domU -- any advice?

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Aug 30, 2012 at 03:37:23PM -0700, Brian Johnson wrote:
>    Hi all,
>    I have a Nvidia GeForce GTX 680 that I'd like to use in a Xen
>    configuration.  I don't care if it's used by dom0 or by a linux domU
>    guest, either would be OK for my purposes.  Since getting this card, I've
>    experimented with Linux 3.4.6 and Xen 4.1.2 and determined the following:
>    1. The card works correctly under a linux kernel without Xen running.
>    2. The Nvidia proprietary drivers do not function in a dom0 setting,
>    because PAT is disabled in the dom0 kernel.  The driver detects this and
>    refuses to run.
>

Hmmm.. maybe Konrad (cc) can tell more about the PAT stuff. 

>    3. Using PCI passthrough to a domU linux VM does not work either -- the
>    Nvidia proprietary driver does not recognize the card in the guest.  Not
>    sure why, but I suspect some resource the card uses is not being passed
>    through correctly.  (I can pass an AMD card to a domU without problems.)
>    I know that the Nvidia proprietary driver doesn't officially support Xen,
>    so getting it to work in dom0 might be futile, even if the PAT issue is
>    resolved.  So my main hope is to get passthrough to a guest working
>    correctly.  Any suggestions?  Is Xen 4.2 more likely to work for my use
>    case?
>

You probably need the Nvidia vga passthru patches for Xen. 
Those patches are not yet merged to Xen, so they're out-of-tree.


>    (The nouveau driver is not an option for me because I require OpenGL 3.2+
>    features, and last I checked, it doesn't support the GTX 680 anyway.)
>    Brian

-- Pasi


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