The Xen Hypervisor

Xen is the open source hypervisor technology, which has been creating great interest in the last few years. It was originally developed by a group led by Ian Pratt in the Computer Labs at the University of Cambridge, and was then spun off as a company called XenSource, which was acquired by Citrix in 2007.

Xen's mode of operation is different from the virtualization tools discussed so far in this chapter. The basic model that all the virtualization tools discussed so far share (bochs, QEMU, the lower-end versions of VMware, and VirtualBox) is something like that shown in Figure 28-13. This is also the mental image most people have of how all virtualization works.

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