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Throughout this book, we've described the standard Xen virtualization technique, paravirtualization. Paravirtualization is a wonderful thing—as we've already outlined, it allows excellent performance and strong isolation, two goals that are difficult to achieve simultaneously. (See Chapter 1 for more on this topic.)

However, paravirtualization requires a modified operating system. Although porting an OS to Xen is relatively painless, by the standards of such things, it's not a trivial task, and it has the obvious limitation of being impossible with closed source operating systems. (While the Xen team did ...

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