From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: A query on frame buffers
Date: Fri, 7 Jan 2011 11:58:13 -0500
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To: Michel =?iso-8859-1?Q?D=E4nzer?= <michel@daenzer.net>
Cc: Prasad Joshi <prasadjoshi124@gmail.com>, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org
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> > The errors
> > 
> > [    3.778476] [drm:r100_ring_test] *ERROR* radeon: ring test failed
> > (sracth(0x15E4)=0xCAFEDEAD)
> > [    3.781010] [drm:r100_cp_init] *ERROR* radeon: cp isn't working (-22).
> > [    3.782542] radeon 0000:00:04.0: failled initializing CP (-22).
> > [    3.784006] radeon 0000:00:04.0: Disabling GPU acceleration
> > 
> > Seem to be disabling GPU functionality. For now, I am interested in
> > Graphics functionality of the ATI card and not GPGPU functionality.
> > 
> > I will appreciate if you can help me with some information on solving
> > this problem. Let me know if I should be asking this question on
> > another forum. Please keep me in CC.
> 
> Looks like dri-devel material, added to CC.
> 
> As a first guess, maybe the system memory pages accessed by the GPU GART
> aren't the same ones intended for this by the VM.

I actually have patches for that (sorry for the late reply).

Try:
git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git devel/ttm.pci-api.v3

But I am not sure if they would make any difference here. You said
you are using KVM-QEMU - you must also be using an IOMMU? Does the IOMMU
give you any errors?