A HIGHLY SCALABLE ACCELERATOR

Embodiments of apparatuses, methods, and systems for highly scalable accelerators are described. In an embodiment, an apparatus includes a plurality of storage locations to store work descriptors to specify work to be performed and a plurality of engines to process the work descriptors. A work descriptor is to include a process address space identifier, PASID, to identify a client, a privilege, an address of a completion record, and an interrupt handle to specify an interrupt table entry to be used to generate a completion interrupt. The apparatus is to validate whether the PASID in the work descriptor matches a PASID in the interrupt table entry.