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

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] Problem: Pattern with vertical colored lines on the dom0 screen
From: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
Date: Thu, 23 Sep 2010 13:53:34 +0200
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Jan Beulich <JBeulich@xxxxxxxxxx>
Delivery-date: Thu, 23 Sep 2010 05:51:41 -0700
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Hi Konrad,

first thanks for trying to help, but it seems I didn't explain the problem not
clear enough.

Am 22.09.2010 schrieb Konrad Rzeszutek Wilk:

> I don't know much about the SLES11 kernel, but I know that I fixed a lot of 
> issues with the PVOPS kernel. It might be that some of those fixes didn't 
> make it
> in the SLES11 kernel.
> The details are on http://wiki.xensource.com/xenwiki/XenPVOPSDRM
> but you have an i915 and there weren't much of changes in the area.
> The big one for the PVOPS was that you had to have CONFIG_DMAR enabled
> so that the code for programming the GART would use the PCI API.

I will have a look on this to understand the behavior ;-)

> My recommendation is to check the .config to see if CONFIG_DMAR
> was enabled for your kernel. After that, take a whirl with the
> PVOPS kernel: http://wiki.xensource.com/xenwiki/XenParavirtOps
> Lastly, did a baremetal kernel work on this machine with X? That is
> a kernel without the Xen hypervisor running alongside?

Yes the SLES11 SP1 linux kernel with X11 works flawless.

In my original mail I wrote at the end:

> With staring at the console I could see that the switch to the screen pattern 
> is
> around the following messages (but no guarantee):
> (XEN) [VT-D]iommu.c:1332: d0:PCI: map bdf = ff:0.0
> (XEN) [VT-D]iommu.c:1332: d0:PCI: map bdf = ff:0.1
> (XEN) [VT-D]iommu.c:1332: d0:PCI: map bdf = ff:2.0
> (XEN) [VT-D]iommu.c:1332: d0:PCI: map bdf = ff:2.1
> (XEN) [VT-D]iommu.c:1332: d0:PCI: map bdf = ff:2.2
> (XEN) [VT-D]iommu.c:1332: d0:PCI: map bdf = ff:2.3

What I wanted to say is, I don't need a linux kernel to reproduce the problem!
With the argument vga=mode-0x314 on the Xen command line the screen gets
patterned while booting only the hypervisor.
As I have the test machine back again I will try to isolate the excat location
in the hypervisor where this effect gets triggered.


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