Interrupt forwarding

Intel® Moderncode for Parallel Architectures

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Interrupt forwarding

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Can the external interrupts received by a cpu's APIC from IOAPIC be forwarded to another cpu ?

The chapter on APIC under IPI section in the intel manual mentions that "To allow a processor to forward an interrupt ... to another processor for servicing" ?

Does this mean that forwarding is possible in software (through OS) or APIC can be configured to do the forwarding by itself ?

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