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

To: "Kay, Allen M" <allen.m.kay@xxxxxxxxx>
Subject: Re: [Xen-devel] Problem: Pattern with vertical colored lines on the dom0 screen
From: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
Date: Thu, 30 Sep 2010 09:58:25 +0200
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, "Han, Weidong" <weidong.han@xxxxxxxxx>, Pasi, Jean Guyader <jean.guyader@xxxxxxxxx>
Delivery-date: Thu, 30 Sep 2010 00:59:18 -0700
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Hi Allen,

Am 30.09.2010 schrieb Kay, Allen M:
> Attached patch fixes dom0 graphics problem on Levnovo T410 when VT-d is 
> enabled.  The patch is derived from a similar quirk in Linux kernel by David 
> Woodhouse and Adam Jackson.  It checks for VT enabling bit in IGD GGC 
> register.  If VT is not enabled correctly in the IGD, Xen does not enable 
> VT-d translation for IGD VT-d engine.  In case where iommu boot parameter is 
> set to force, Xen calls panic().

This worked for my Fujitsu S760 too!

> Signed-off-by: Allen Kay allen.m.kay@xxxxxxxxx
> -----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.
> > 
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