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VM (operating system) - Wikipedia
A given VM mainframe typically runs hundreds or thousands of virtual machine instances. VM-CP began life as CP-370, a reimplementation of CP-67, itself a reimplementation of CP-40. Running within each virtual machine is another, "guest" operating system. This might be:

Mainframe operating system: z/VM - IBM
As a control program, z/Virtual Machine (z/VM®) is a hypervisor because it runs other operating systems in the virtual machines it creates. Any of the IBM® mainframe operating systems such as z/OS®, Linux® for zSeries®, z/VSE™, and z/TPF can be run as guest systems in their own virtual machines, and z/VM can run any combination of guest systems.

z/VM Operating System Virtualization Technology Platform | IBM
IBM® z/VM® is a highly secure and scalable virtualization technology for cloud infrastructure and for running critical applications on IBM Z® and LinuxONE™ servers. The IBM z/VM Continuous Delivery model enables clients to exploit new and innovative z/VM capabilities at their own pace.

VMware and the mainframe - CNET
Culture VMware and the mainframe. Why the path to reliable and efficient server virtualization will lead to the IBM zSeries mainframe.

Turn a PC into a mainframe with VMware GSX Server
Turn a PC into a mainframe with VMware GSX Server. By Thomas Shinder MCSE in Data Centers on December 27, 2001, 12:00 AM PST Few companies have the ready cash to spend on a mainframe. ...

Mainframe virtualization: Old friends are often best
Mainframe virtualization z/VM delivers compute efficiency. From its inception, "virtual" computing has had two distinct meanings. At the hardware level, virtual memory or virtual disk allows systems to deliver the speed of a faster, higher level of storage and the capacity of a lower level of storage.

Five questions on Linux and z/VM OS for mainframes
Generally speaking, how do you see Linux developing or evolving for mainframe platforms into 2012? James Vincent: I believe that Linux on the mainframe will continue to take advantage of the advancements in the OS and enhance it with mainframe-specific features and tools. There have been some beneficial enhancements made in Linux that mimic features other mainframe OS’s have provided, such ...

Server Virtualization on IBM Z
What is server virtualization? Server virtualization is the optimization of an IT infrastructure by creating a virtual instance of an operating system on a virtual platform reducing the need for more physical servers. Virtualization on IBM Z® and IBM LinuxONE™ allows you to inherit the unique advantages of IBM z/Architecture®:

VSE (operating system) - Wikipedia
z/VSE (Virtual Storage Extended) is an operating system for IBM mainframe computers, the latest one in the DOS/360 lineage, which originated in 1965. Announced Feb. 1, 2005 by IBM as successor to VSA/ESA 2.7, then-new z/VSE was named to reflect the new "System z" branding for IBM's mainframe product line.

Introduction to the New Mainframe: z/VM Basics
Introduction to the New Mainframe: z/VM Basics Lydia Parziale Edi Lopes Alves Eli M. Dow Klaus Egeler Jason J. Herne Clive Jordan Eravimangalath P. Naveen Manoj S Pattabhiraman Kyle Smith Understand introductory z/VM concepts Learn basic system administration tasks to manage your system Study z/VM performance,

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