Importance

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Abstract

A virtual computer system including 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.

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First Claim