Windows XP Home Guest on Ubuntu KVM

I needed to do some semi-dangerous testing on Windows XP, but I really didn't feel like buying another copy at "we want you to upgrade to Vista" prices (especially since I own several compulsory copies). I need to keep my netbook clean and eventually I'd even like to swap it to Linux (once I figure out what to do about the gyro disk driver thing). So I installed a VM using virt-install under KVM on my laptop. It installed lightning fast and runs faster than on my netbook even.

However, initially I had a mouse offset that was intensely annoying. The trick was changing the /etc/libvirt/qemu/winxphomevm.xml file near the bottom to read like this:

    <input type='tablet' bus='usb'/>
    <input type='mouse' bus='ps2'/>