Channel address control system in a virtual machine system

Details Channel address control system in a virtual machine system Channel address control system in a virtual machine system

G - Physics

06

F

354/230.6

G06F 9/28 (2006.01) G06F 9/38 (2006.01) G06F 9/46 (2006.01) G06F 12/08 (2006.01) G06F 13/00 (2006.01) G06F 15/00 (2006.01)

Patent

CA 1123109

ABSTRACT OF THE DISCLOSURE The present invention discloses a virtual machine system having a virtual storage function, wherein registers are provided for holding the heading and trailing addresses of the continuous area on the main storage assigned respectively for each of the plural operating systems. When access is performed to the main storage from the channel or sub-channel, one of the registers is selected. The heading address of the register selected is added to the main storage address sent from the channel or sub-channel. The added main storage address is compared with the trailing address in the selected register and, if the former is smaller than the latter, the over head for supporting the virtual storage is reduced by making access to the main storage in accordance with the added main storage address.

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