Paravirtualization: Xen's Approach
Finally, somewhere between the two, there's paravirtualization, which relies on the operating system being modified to work in concert with a sort of "super operating system," which we call the hypervisor. This is the approach Xen uses.
How Paravirtualization Works
Xen works by introducing a very small, very compact and focused piece of software that runs directly on the hardware and provides services to the virtualized operating systems.[11]
Xen's approach to virtualization does away with most of the split between host OS and guest OS. Full virtualization and OS-level virtualization have a clear distinction—the host OS is the one that runs with full privileges. With Xen, only the hypervisor has full privileges, ...
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