Interrupt handling in a logically partitioned system by changing the interrupt status values in an array for only one partition at a time.

摘要

Disclosed is a method of interrupt handling in a logically partitioned data processing system. The system has at least two logical partition zones and at least one interrupt handling array, which includes bit values that change in accordance with the change of an interrupt pending status of the data processing system. A change of the interruption pending status is only performed for a logical partition zone having an updated bit value. The interrupt pending status is changed for only one partition at a time. The current interrupt pending status for all the zones may be stored as a vector or array of interrupt states, with one bit per zone. In the cases where a back-to-back writes to the same entry in the array a bypass may be used to bypass the array.