Virtual Machine Monitors

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B. Virtual Machine Monitors Introduction Years ago, IBM sold expensive mainframes to large organizations, and a problem arose: what if the organization wanted to run different oper- ating systems on the Machine at the same time ? Some applications had been developed on one OS, and some on others, and thus the problem. As a solution, IBM introduced yet another level of indirection in the form of a Virtual Machine monitor (VMM) (also called a hypervisor) [G74]. Specifically, the monitor sits between one or more operating systems and the hardware and gives the illusion to each running OS that it con- trols the Machine .

Virtual Machine Monitors B.1 Introduction Years ago, IBM sold expensive mainframes to large organizations, and a problem arose: what if the organization wanted to run different oper-ating systems on the machine at the same time? Some applications had been developed on one OS, and some on others, and thus the problem.

  Virtual, Time, Machine, Monitor, Virtual machine monitors