"Linux cannot be said to suffer from a shortage of
virtualization solutions. What is harder to come by, however, is a
paravirtualization system which is amenable to relatively easy
understanding. A relatively recent entrant into the field, however,
changes that situation significantly. With just 6,000 lines
(including the user-space code), Rusty Russell's hypervisor
implementation, lguest (also known as the 'Rustyvisor'), provides a
full, if spartan paravirtualization mechanism for Linux..."