Turns out, it’s an utter failure. Xen kernel won’t even boot. And the package management system has been timing out really really badly. Though I think that’s just SingNet, not me.
Anyway, the commands used:
pfexec su –
pkg install xvm-gui (This grabs all the dependencies too…)
For some reason, it also removed the grub entry for the original kernel. No clue why it did it, but it left the system in an unbootable state.
So moved to CentOS 5.4. Except that’s a whole other deal.