This is a follow-up to this article . New patches could be downloaded at www.davidgis.fr/download/xen-4.2_rev25240_gfx-passthrough-patchs.tar.bz2.

Due to changeset 25525, don't forget to add this parameter to your configuration file

pci_msitranslate = 1
Else when booting your domU you may have critical issues. This setting hasn't been taken into account in my patches.