Virtual computer system having improved input/output...

G - Physics – 06 – F

Patent

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Details

354/230.85

G06F 9/46 (2006.01) G06F 13/10 (2006.01) G06F 13/14 (2006.01) G06F 13/24 (2006.01)

Patent

CA 2009555

A virtual computer system includes a plurality of virtual machines running in a central processing unit with time shared, an input/output unit generating an input/output interrupt request, and a specific instruction generating part for generating a specific instruction indicating a priority to one of the virtual machines which is running. The system further includes a decision part for determining whether the input/output interrupt request addressed to one of the virtual machines has a priority equal to that indicated by the specific instruction and for generating an interrupt accepting signal when the decision result is affirmative. Moreover, the system includes a monitor part for transferring a right to use the central processing unit from the one of the virtual machines which is running to the one of the virtual machines which is addressed by the input/output interrupt request when the interrupt accepting signal from the decision part is supplied to the monitor part.

Un système informatique virtuel se compose d'un ensemble de machines virtuelles se partageant le temps d'opération d'une unité centrale de traitement, d'une unité d'entrée-sortie dont les instructions gèrent le flot d'entrée-sortie et d'une composante gérant spécifiquement l'ordre de priorité accordée à chacune des machines virtuelles exécutant une tâche. Une composante supplémentaire du système vérifie si l'instruction de gestion du flot d'entrée-sortie destinée à l'une des machines virtuelles se situe au même niveau de priorité que la priorité d'accès à l'unité centrale. Si c'est le cas, la gestion du flot d'entrée-sortie a priorité. De plus, si la gestion du flot d'entrée-sortie est dirigée vers l'écran et que celui-ci doit faire appel à l'unité centrale de traitement, la procédure de décision permet de soustraire à une machine virtuelle son contrôle de l'unité centrale et de le passer à l'écran.

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