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Version 3.0 of Xen removes some major limitations.
Up until the recent release of Xen 3.0, a major obstacle to the adoption of Xen in some environments was the software’s lack of support for unmodified operating systems. Xen’s original approach of paravirtualization, modifying an operating system to facilitate virtualization, yielded great performance, but failed to host operating systems for which source code is unavailable.
Fortunately, with the launch of new x86 CPUs that provide hardware support for virtualization-- Intel’s VT extensions and AMD’s SVM both provide on-chip support for creating virtualized processor contexts-- unmodified operating systems can now be hosted on Xen.
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