Directed interrupt for multilevel virtualization

US11138139B2 · kind B2 · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Bernd Nerz · Eppelheim, DE
• Marco Kraemer · Sindelfingen, DE
• Christoph Raisch · Gerlingen, DE
• Donald W. Schmidt · Stone Ridge, US
• Peter D. Driever · Poughkeepsie, US

Key dates

• Filing date: Feb 13, 2020
• Grant date: Oct 5, 2021
• Expiry date: Feb 13, 2040

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F9/542
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An interrupt signal is provided to a first guest operating system. A bus attachment device receives an interrupt signal from a bus connected module with an interrupt target ID identifying a processor assigned for use by the guest operating system as a target processor for handling the interrupt signal. The bus attachment device checks whether the target processor is scheduled for usage by the guest operating system. If the target processor is not scheduled for usage, the bus attachment device forwards the interrupt signal using broadcasting and updates a forwarding vector entry stored in a memory section assigned to a second guest operating system hosting the first guest operating system. The update is used for indicating to the first operating system that there is a first interrupt signal addressed to the interrupt target ID to be handled.