Ok this is way cool and I liked the way they wrote this up so much I am just going to point you to them
So that load you thought would be fine on a hypervisor just didn’t work out, eh? Maybe it was just too intensive, or maybe your software vendor bumped you off support. Whatever the reason, the need for V2P happens. It’s not the easiest thing in the world, but it can be done. This article is written with Hyper-V Server in mind, but most of its guidance should be applicable regardless of hypervisor.
This is from the Altaro blog http://www.altaro.com/hyper-v/ this is worth book marking.