By David E. Williams, Juan Garcia and Simon Crosby (Auth.)

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Additional resources for Virtualization with Xen™. Xen: Enterprise, ™ Xen: Server, ™ and Xen: Express ™

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Handles non-virtualizable instructions by using trapand-emulate in hardware versus software; selectively employs accelerations techniques for memory and I10 operations; supports x64 (64-bit x86 extensions) targeted operating systems; has the highest CPU, memory, and I10 performance of all types of x86 virtual machines. Requires CPU architecture that supports hardwareassisted acceleration; still requires some OS modif ication for paravirtualized guests, although less than pure paravirtualization.

Unfortunately, this design approach proved to be too costly and proprietary for mainstream acceptance. The most common CPU architecture used in modern computers is the IA-32, or x86-compatible, architecture. Beginning with the 80286 chipset, the x86 family provided two main methods of addressing memory: real mode and protected mode. In the 80386 chipset and later, a third mode was introduced called virtual 8086 mode, or VM86, that allowed for the execution of programs written for real mode but circumvented the real-mode rules without having to raise them into protected mode.

While there are many different implementations of a VMM for x86, they can be summarized into four distinct categories. 4 provides additional information about each category for server virtualization. 4 Types of Server Virtualization Type of Virtualization Description Full virtualization A virtualization technique that provides complete simulation of the underlying hardware. The result is a system in which all software capable of execution on the raw hardware can be run in the virtual machine. Full virtualization has the widest range of support of guest operating systems.

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