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Re: [Xen-devel] Desktop Environment/GUI Cannot Start After I Have Installed Xen 4.1.3-rc1-pre and Linux Kernel 3.3.0-rc7


We are developing a pvops kernel based off of the Ubuntu 12.04 3.2.x
kernel, with some merges from Konrad's development trees, along with
some other patches.

My full config is attached.

We are running on a wide variety of hardware - both nVidia (as long as
you use nouveau) - and Intel.

We have CONFIG_INTEL_IOMMU set to "y"
(this used to be DMAR)

The guys at Intel recommended this be turned on, when we were seeing
very similar crashes.

Without rehashing our entire email train - the executive summary is:
The major problem is related to CONFIG_DMAR_TABLE, which if not set
i915 driver uses virt_to_phys for address translation which is not Xen
aware. You can have a check whether it’s the same case in your


 there’s some renaming happened recently from CONFIG_DMAR to
CONFIG_INTEL_IOMMU, which you can also check with your earlier

Hope this is helpful

Ben Guthro
Virtual Computer, Inc.

On Thu, Mar 15, 2012 at 4:54 AM, Stefan Bader
<stefan.bader@xxxxxxxxxxxxx> wrote:
> On 15.03.2012 09:29, Konrad Rzeszutek Wilk wrote:
>> On Thu, Mar 15, 2012 at 2:07 AM, Teo En Ming (Zhang Enming)
>> <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
>>> Hi,
>>> I have solved the problem. Xen 4.1.x is incompatible with the onboard
>>> graphics of Intel DQ45CB motherboard. I have switched the graphics adapter
>>> to NVIDIA 8400 GS PCI Express x16 and the combination of Xen 4.1.3-rc1-pre,
>>> kernel 3.3.0-rc7, and NVIDIA 8400 GS works well (Xen 4.1.x is compatible
>>> with NVIDIA 8400 GS graphics).
>> <sigh> No. The reason it is not working is b/c you have this in your config:
>> # CONFIG_INTEL_IOMMU is not set
>> If you unset that (so CONFIG_INTEL_IOMMU=y) it will work.
>> Stefan, can this option be set in the Ubuntu kernels?
> Hi Konrad,
> this is actually different in the current (for 12.04) kernel configurations:
> The reason it is not on by default is that some machines showed issues
> https://bugs.launchpad.net/ubuntu/+source/debian-installer/+bug/907377
> Btw, this is talking about a 3.3.0-rc7 kernel, which is either taken from the
> mainline builds or even self-compiled. 11.10 came with 3.0 and even 12.04 is 
> 3.2
> only.
> -Stefan
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxx
> http://lists.xen.org/xen-devel

Attachment: config.virtualcomputer.amd64
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