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http://www.xensource.com/xen/about.html

What is Xen?
============

Xen is a Virtual Machine Monitor (VMM) originally developed by the
Systems Research Group of the University of Cambridge Computer
Laboratory, as part of the UK-EPSRC funded XenoServers project.  Xen
is freely-distributable Open Source software, released under the GNU
GPL. Since its initial public release, Xen has grown a large
development community, spearheaded by XenSource Inc, a company created
by the original Xen development team to build enterprise products
around Xen.

The 3.0 release offers excellent performance, hardware support and
enterprise-grade features such as x86_32-PAE, x86_64, SMP guests and
live relocation of VMs. This install tree contains source for a Linux
2.6 guest; ports to Linux 2.4, NetBSD, FreeBSD and Solaris will follow
later (and are already available for previous Xen releases).


What is Xen on ARM?
===================
Secure Xen on ARM is an ARM port of the x86 version of Xen-3.0.2-2 plus
security features in Xen. It allows the simultaneous execution 
of multiple operating systems and their legacy application software stacks 
on a single ARM core-based system-on-chip. Each guest OS instance runs 
in their own OS partition called "domain" and the OS partitions are 
securely isolated from each other.

The original Xen solution comes with many user-land utilities. We have ported 
most core component such as xend, xenstore, xm and xenconsole.

Notes: The current version of Secure Xen on ARM only supports "static partitioning"
of system memory, which means that the number of guest domains and the amount 
of memory allocated to the guest domains is fixed at compile time. You have to 
configure system memory partitioning properly before building Secure Xen on ARM.
The shadow page table and the writable page table are not included in this release 
but we are working on them so hopefully they will be enabled in our next release.
