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== History ==
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[[IBM]] developed the concept of [[hypervisor]]s ([[virtual machine]]s in [[IBM CP-40|CP-40]] and [[CP-67]]) and in 1972 provided it for the [[IBM System/370|S/370]] as [[VM (operating system)|Virtual Machine Facility/370]].<ref>{{
cite book |url=http://www.vm.ibm.com/pubs/HCSF8A50.PDF |title=z/VMbuilt on IBM Virtualization Technology General Information Version 4 Release 3.0 |id=GC24-5991-04 |date=2002-04-12 |publisher=[[IBM]]}}</ref> IBM introduced the Start Interpretive Execution (SIE) instruction (designed specifically for the execution of virtual machines) in 1983 as part of [[IBM System/370-XA|370-XA]] architecture on the [[IBM 3081]], as well as VM/XA versions of VM to exploit it.
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