Technically
These are already a known problem. I do love the refinements though. When you have the leakage of energy (information actually since the two are equivalent) from one system to another (VM to VM in this case), you have a potential vector for collection of that energy. It's that simple. Now doing this on systems with multiple processes (not just two which is the trivial case) sharing the same system is interesting. Nice bit of work here and methinks worthy.
Theoretically, since the universe is supposedly a closed system (I have serious doubts about that), you can perform this anywhere on anything but we're thankfully far from that level of sophistication.