DETERMINATION OF ONE OR MORE PARTITIONABLE ENDPOINTS AFFECTED BY AN I/O MESSAGE

摘要

A data processing system includes a processor core, a system memory (116) including a first data structure (500) including a plurality of entries (502) mapping requester identifiers (IDs) (410) to partitionable endpoint (PE) numbers, and an input/output (I/O) subsystem including a plurality of PEs each having an associated PE number, where each of the plurality of PEs including one or more requesters each having a respective requester ID. An I/O host bridge (120), responsive to receiving an I/O message including a requester ID and an address, determines a PE number by reference to a first entry from the first data structure, and responsive to determining the PE number, accesses a second entry of a second data structure (510) utilizing the PE number as an index and validates the address by reference to the accessed entry in the second data structure. The I/O host bridge, responsive to successful validation, provides a service indicated by the I/O message.