RE: [Xen-devel] NVidia driver status

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Jacob Gorm Hansen
> Sent: 30 January 2007 15:33
> To: xen-devel
> Subject: [Xen-devel] NVidia driver status
> 
> hi,
> 
> being dissapointed a bit by ATI's support for Xen, I just purchased a
> top-of-the-line Dell box with an expensive NVidia graphics card, as
> rumour said they would work better than the ATI ones. 
> Unfortunately, the
> NVidia installer detects that I am running Xen, and then refused to
> compile the kernel module, saying that Xen is not supported. 
> Does anyone
> know of a way around this check, or have fresh experiences getting Xen
> and NVidia to play together?

Now, there may be calls to say that I'm biased here, but I'm really not
working with the ATI-side of AMD anyways, so: 

The reason it refuses to compile the kernel module is probably more to
do with the fact that the guys at nVidia KNOWS that it's not going to
work anyways. If that's the case, it's not really much point in
bypassing the check itself. 

It's quite common for (graphics) driver code to make "nasty" stuff with
memory addresses, use DMA for all sorts of weird and wonderfull things,
and in general do things that aren't "xen-friendly". Most other drivers,
for example, won't put a memory address inside a DMA buffer, that refers
to a different area of memory that may not even be a DMA buffer in
itself. 

Just as an idea for "tricking": have you run strace on the installer to
see how it figures out that you're on a Xen kernel? Is it using some
xm-tool, the kernel name (-xen) or some other method. You may be able to
bypass it once you know how it works... ;-)

--
Mats
> 
> Thanks,
> Jacob
> 
> 
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