Re: [Xen-devel] Problem: Pattern with vertical colored lines on the dom0 screen

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Sep 27, 2010 at 02:06:26PM +0200, Dietmar Hahn wrote:
> Hi Jean,
> 
> many thanks for this hint! This saved me a lot of time searching through
> the specs.
> 
> Am 24.09.2010 schrieb Jean Guyader:
> > The problem we saw with that the bit 10 of the GCC (offset 0x52 on the
> > PCH config space)
> > wasn't set after the bios. This bit probably enable the shadow GTT
> > (created with the GTT + vt-d).
> 
> Yes, the same problem here!
> I found the following patch, maybe something similar would help here too?
> https://patchwork.kernel.org/patch/132771

There looks to be another in the upstream kernels:

check_tylersburg_isoch
> 
> So I have to hit the bios development :-(

Well, we should probably provide a quirk check in the Xen code.

Copying the Intel folks to see if they any ideas on adding this in the Intel 
VT-d
code paths. Or they might have already a patch ready for this?
> 
> > The vertical stripes means GTT fault.
> > 
> > Jean
> 
> Many thanks!
> Dietmar.
> 
> -- 
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> 
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