[Xen-users] Success: VT-d on ASUS P6T

[Felix Kuperjans <felix@xxxxxxxxxxxxxxxxxx>]

Hi,

I've successfully used VT-d on an ASUS P6T mainboard which is known to have 
really buggy RMRR tables.

I tested passtrough with:
- the onboard (fake-)raid-controller (no problems)
- a pci card (no problems)
- VGA cards (worked only partly - I'll investigate that)

I wrote a little patch to the code parsing the RMRR tables and enabled the 
following command line options:
iommu=passtrough iommu_inclusive_mapping=1

As an attachment, I created a full patch which enables those command line 
options by default and can be directly applied to XEN 4.0.0.
However, this patch is *not* intended to be merged to the unstable versions and 
I'll discuss an appropriate patch on xen-devel.

This patch is only for those people who want to use VT-d on an ASUS P6T right 
now with the latest stable version of XEN.
It does not need those command line options to be explicitly specified because 
they are set by default so you can't forget anything.

It also introduces a no-passtrough option, so that you can test booting without 
the iommu=passtrough option, but none of my kernels ever booted successfully 
this way.
If you find any kernel / configuration that does boot with this patch applied 
and iommu=no-passtrough specified, please post it here.

Regards,
Felix

Attachment: xen-asus-p6t-vtd-hack.patch
Description: Text document

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