Virtual machine and method for controlling the same

Details Virtual machine and method for controlling the same Virtual machine and method for controlling the same

1994-10-25

1996-06-25

Lane, Jack A.

395413, G06F 1208

Patent

active

055308201

ABSTRACT:
A level-2 virtual machine is constructed under the control of a level-1 operating system (OS) operating on a real machine (level-1), and a level-3 virtual machine is constructed under the control of another operating system (OS) operating on the level-2 virtual machine. A level-3 virtual address generated in the level-3 virtual machine is translated to a level-2 virtual address, which is further translated to a level-1 virtual address. A third predetermined main storage address is added to the level-1 virtual address to generate a level-1 absolute address. The translated address is checked as to whether it is within a predetermined area on the main storage.

REFERENCES:
patent: 4253145 (1981-02-01), Goldberg
patent: 4456959 (1984-06-01), Bullion, III et al.
patent: 4792895 (1988-12-01), Tallman
patent: 4816991 (1989-03-01), Watanabe et al.
"System/370 Extended Architecture: Facilities for Virtual Machines", IBM J. Res. Develop., vol. 27, No. 6, Nov. 1983.

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