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They operate behind the scenes, extending the services available to CMS without adding to the VM-CP control program. Several non-CMS systems run within VM-CP virtual machines, providing services to CMS users such as spooling, interprocess communications, specialized device support, and networking. (They can also run as 'native' operating systems on the bare hardware.) There was also the short-lived IX/370, as well as S/370 and S/390 versions of AIX (AIX/370 and AIX/ESA). In the mainframe environment, these operating systems often run under VM, and are handled like other guest operating systems.
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This technique was used to develop S/370 software before S/370 hardware was available, and it has continued to play a role in new hardware development at IBM. This is how VM development and testing is done (a second-level VM can potentially implement a different virtualization of the hardware). A second level instance of VM can be fully virtualized inside a virtual machine. The VM hypervisor can simulate several types of console terminals for the guest operating system, such as the hardcopy line-mode 3215, the graphical 3270 family, and the integrated console on newer System/390 and System Z machines. Most mainframe operating systems terminate a normal application which tries to usurp the operating system's privileges. The VM hypervisor treats guest operating systems as application programs with exceptional privileges – it prevents them from directly using privileged instructions (those which would let applications take over the whole system or significant parts of it), but simulates privileged instructions on their behalf. the MVS, DOS/VSE, or TSS/370 families) can be loaded and run without modification. IBM originally provided GCS in order to run VTAM without a service OS/VS1 virtual machine and VTAM Communications Network Application (VCNA).
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It performs the system's resource-sharing, including device management, dispatching, virtual storage management, and other traditional operating system tasks.
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VM-CP provides full virtualization of the physical machine – including all I/O and other privileged operations. It runs on the physical hardware, and creates the virtual machine environment. The heart of the VM architecture is the Control Program or hypervisor abbreviated CP, VM-CP and sometimes, ambiguously, VM.