Directed interrupt virtualization with blocking indicator

A computer system for providing an interrupt signal to a guest operating system executed using one or more processors of a plurality of processors of a computer system assigned for usage by the guest operating system, the computer system configured to perform a method, said method comprising:

• receiving, by a bus attachment device from a bus connected module of a plurality of bus connected modules operationally coupled to the plurality of processors via the bus attachment device, an interrupt signal with an interrupt target ID, the interrupt target ID identifying one processor of the plurality of processors assigned for usage by the guest operating system as a target processor to handle the interrupt signal;
• retrieving, by the bus attachment device, a first copy of an interrupt table entry assigned to the interrupt target ID from an interrupt table, the first copy of the interrupt table entry comprising an interrupt blocking indicator indicating whether the target processor identified by the interrupt target ID is currently blocked from receiving interrupt signals;
• checking, by the bus attachment device, using the interrupt blocking indicator whether the target processor is blocked from receiving interrupt signals;
• translating, by the bus attachment device based on the target processor being unblocked, the interrupt target ID to a logical processor ID, and forwarding the interrupt signal to the target processor to handle, the forwarding using the logical processor ID resulting from the translating to address the target processor directly;
• and
• blocking, by the bus attachment device based on the target processor being blocked, the interrupt signal from being forwarded to the target processor for handling.

A computer-implemented method of providing an interrupt signal to a guest operating system executed using one or more processors of a plurality of processors of a computer system assigned for usage by the guest operating system, the computer-implemented method comprising:

• receiving, by a bus attachment device from a bus connected module of a plurality of bus connected modules operationally coupled to the plurality of processors via the bus attachment device, an interrupt signal with an interrupt target ID, the interrupt target ID identifying one processor of the plurality of processors assigned for usage by the guest operating system as a target processor to handle the interrupt signal;
• retrieving, by the bus attachment device, a first copy of an interrupt table entry assigned to the interrupt target ID from an interrupt table, the first copy of the interrupt table entry comprising an interrupt blocking indicator indicating whether the target processor identified by the interrupt target ID is currently blocked from receiving interrupt signals;
• checking, by the bus attachment device, using the interrupt blocking indicator whether the target processor is blocked from receiving interrupt signals;
• translating, by the bus attachment device based on the target processor being unblocked, the interrupt target ID to a logical processor ID, and forwarding the interrupt signal to the target processor to handle, the forwarding using the logical processor ID resulting from the translating to address the target processor directly;
• and
• blocking, by the bus attachment device based on the target processor being blocked, the interrupt signal from being forwarded to the target processor for handling.