PCI and VGA passthrough on Xen

In 2012 I was testing Xen for PCI and VGA graphics card passthrough. I used Xen 4.1.2 on Gentoo Linux and had partial success with an ATI graphics card. Although the guest OS (Windows XP) was running stable, video output disappeared after rebooting the virtual machine or became stuck from time to time. However, I'm uploading the config file and scripts for reference.

• config was used as the host kernel configuration (Linux 3.5.3 x86_64)
• grub.cfg hid certain PCI devices from the host operating system (dom0 in Xen terms)
• pci.sh was used to unbind PCI devices from the host and assign them to the stub driver
• wxp.txt is the Xen domU configuration for Windows XP
• qemu-wxp2.sh was an unsuccessful approach using qemu and KVM

See also my howto about PCI passthrough on Citrix XenServer