Running Xen->Ubuntu 12.04 has the undesired side effect of stopping
VirtualBox from working, which means side by side debugging is a pain,
as I need to reboot, and swsusp stops working on my main machine.
So, now I have Ubuntu 12.04 running inside VirtualBox, and inside
that, I am now creating a Xen guest running Ubuntu 12.04 (yes,
thats 12.04 inside 12.04 inside 12.04). Its kind of mind
boggling but hopefully I can try and debug the dtrace issues.