VM/ESA and z/VM

Any �privileged� instructions are intercepted and
simulated on behalf of the guests. (Think kernel vs.
user space, but at an instruction level.)

Generally, VM �owns� the hardware unless special
steps are taken to dedicate something to a guest.

VM allows dynamic creation and destruction of virtual
resources, such as disks (DASD), CTC connections,
storage, I/O paths, etc.

VM will allow you to control how much CPU,
virtual storage, disk space etc., that a given guest
will receive, as well as its priority.

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Copyright 2001 by Mark Post