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-\chapter{Glossary of Terms}
-
-\begin{description}
-
-\item[Atropos] One of the CPU schedulers provided by Xen.  Atropos
-  provides domains with absolute shares of the CPU, with timeliness
-  guarantees and a mechanism for sharing out `slack time'.
-
-\item[BVT] The BVT scheduler is used to give proportional fair shares
-  of the CPU to domains.
-
-\item[Exokernel] A minimal piece of privileged code, similar to a {\bf
-    microkernel} but providing a more `hardware-like' interface to the
-  tasks it manages.  This is similar to a paravirtualising VMM like
-  {\bf Xen} but was designed as a new operating system structure,
-  rather than specifically to run multiple conventional OSs.
-
-\item[Domain] A domain is the execution context that contains a
-  running {\bf virtual machine}.  The relationship between virtual
-  machines and domains on Xen is similar to that between programs and
-  processes in an operating system: a virtual machine is a persistent
-  entity that resides on disk (somewhat like a program).  When it is
-  loaded for execution, it runs in a domain.  Each domain has a {\bf
-    domain ID}.
-
-\item[Domain 0] The first domain to be started on a Xen machine.
-  Domain 0 is responsible for managing the system.
-
-\item[Domain ID] A unique identifier for a {\bf domain}, analogous to
-  a process ID in an operating system.
-
-\item[Full virtualisation] An approach to virtualisation which
-  requires no modifications to the hosted operating system, providing
-  the illusion of a complete system of real hardware devices.
-
-\item[Hypervisor] An alternative term for {\bf VMM}, used because it
-  means `beyond supervisor', since it is responsible for managing
-  multiple `supervisor' kernels.
-
-\item[Live migration] A technique for moving a running virtual machine
-  to another physical host, without stopping it or the services
-  running on it.
-
-\item[Microkernel] A small base of code running at the highest
-  hardware privilege level.  A microkernel is responsible for sharing
-  CPU and memory (and sometimes other devices) between less privileged
-  tasks running on the system.  This is similar to a VMM, particularly
-  a {\bf paravirtualising} VMM but typically addressing a different
-  problem space and providing different kind of interface.
-
-\item[NetBSD/Xen] A port of NetBSD to the Xen architecture.
-
-\item[Paravirtualisation] An approach to virtualisation which requires
-  modifications to the operating system in order to run in a virtual
-  machine.  Xen uses paravirtualisation but preserves binary
-  compatibility for user space applications.
-
-\item[Shadow pagetables] A technique for hiding the layout of machine
-  memory from a virtual machine's operating system.  Used in some {\bf
-  VMMs} to provide the illusion of contiguous physical memory, in
-  Xen this is used during {\bf live migration}.
-
-\item[Virtual Block Device] Persistant storage available to a virtual
-  machine, providing the abstraction of an actual block storage device.
-  {\bf VBD}s may be actual block devices, filesystem images, or
-  remote/network storage.
-
-\item[Virtual Machine] The environment in which a hosted operating
-  system runs, providing the abstraction of a dedicated machine.  A
-  virtual machine may be identical to the underlying hardware (as in
-  {\bf full virtualisation}, or it may differ, as in {\bf
-  paravirtualisation}).
-
-\item[VMM] Virtual Machine Monitor - the software that allows multiple
-  virtual machines to be multiplexed on a single physical machine.
-
-\item[Xen] Xen is a paravirtualising virtual machine monitor,
-  developed primarily by the Systems Research Group at the University
-  of Cambridge Computer Laboratory.
-
-\item[XenLinux] Official name for the port of the Linux kernel that
-  runs on Xen.
-
-\end{description}