the clouds will be a daisy chain.

Still bouncing back and forth between the various things that need doing.  I think migration is the current lowest-hanging fruit, so I'm going to address that.

The only things I really want to clear up there, other than the usual rewriting, are the (relatively new) -c option to xm save, and the hooks Xen provides to migrate external devices.  One of those is trivial; the other is quite hard.

But hey, I'm having fun, I think.