MattKC: How I set up Windows XP GPU passthrough with libvirt/QEMU/KVM

Thought this'd be interesting for those here, a tutorial for installing/running a Windows XP virtual machine with GPU passthrough. The tutorial needs a little rewrite, and I might consider doing that rewrite myself, but I was able to get things to run fine.

Only warning I'd give is that some GPUs might not work OOTB with the virtual audio chipset. This happened to me when I was trying to use a virtual AC97 chipset - I had to move my GPU to a different virtual slot in the virtual machine to get it to work.