The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 27, 2017
Filed:
Nov. 03, 2015
International Business Machines Corporation, Armonk, NY (US);
Andre L. Albot, Austin, TX (US);
Vishal C. Aslot, Austin, TX (US);
Bruce Mealey, Austin, TX (US);
Nicholas Stilwell, Austin, TX (US);
INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US);
Abstract
Embodiments disclose techniques for emulating memory mapped I/O (MMIO) for coherent accelerators in an error state. In one embodiment, once an operating system determines that a processor is unable to access a coherent accelerator via a MMIO operation, the operating system deletes one or more page table entries associated with MMIO of one or more hardware contexts of the coherent accelerator. After deleting the page table entries, the operating system can detect a page fault associated with execution of a process by the processor. Upon determining that the page fault was caused by the process attempting to access one of the deleted page table entries while executing a MMIO operation, the operating system emulates the execution of the MMIO operation for the faulting process, giving the process the illusion that its requested MMIO operation was successful.