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

["Kay, Allen M" <allen.m.kay@xxxxxxxxx>]

Thanks Konrad.  I got hold of a T410 and able to duplicate the problem with the 
2.6.36-rc5 kernel.

Currently, I'm encountering a problem with the latest xen/pvops kernel.  I'm 
getting "No root device found ... Boot has failed, sleep forever."

If anyone knows how to fix this (i.e. which config to turn on), please let me 
know.  My base OS is FC13.

Allen

-----Original Message-----
From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx] 
Sent: Monday, September 27, 2010 9:47 AM
To: Dietmar Hahn; Han, Weidong; Kay, Allen M
Cc: Jean Guyader; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Problem: Pattern with vertical colored lines on the 
dom0 screen

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.
> 
> -- 
> Company details: http://ts.fujitsu.com/imprint.html
> 
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