Input-output control method in a virtual machine system

Details Input-output control method in a virtual machine system Input-output control method in a virtual machine system

1986-07-30

1989-12-12

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 910, G06F 400

Patent

active

048872024

ABSTRACT:
An I/O control system in a virtual machine system has at least one virtual machine (VM) running under control of a virtual machine control program (VMCP) and has a direct I/O execution mode in which an I/O interruption to the I/O device dedicated by the running VM is directly executed without intervention of the VMCP and an indirect I/O execution mode in which the I/O interruption is simulated. The I/O control system comprises identification portion for identifying the I/O device requesting the switching to the direct I/O execution mode, judge portion for judging a mode switching condition and mode selection portion for selecting one of the two modes. If the VM which contemplates the direct execution has not yet dedicated the I/O device requesting the mode switching, it dedicates the I/O device, and if the VM has not yet dedicated an I/O interrupt subclass which controls the I/O interruption of the I/O device, it dedicates the subclass, and the I/O device in the indirect I/O execution mode is switched to the direct I/O execution mode.

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patent: 4533996 (1985-08-01), Hartung et al.
patent: 4571674 (1986-02-01), Hartung
patent: 4674038 (1987-06-01), Brelsford et al.
patent: 4802084 (1989-01-01), Ikegaya et al.
patent: 4814975 (1989-03-01), Hirosawa et al.

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