Re: [PATCH v2 3/4] KVM: ioapic: extract body of kvm_ioapic_set_irq

From: Paolo Bonzini
Date: Sun Mar 23 2014 - 04:45:15 EST

Il 21/03/2014 19:58, Radim KrÄmÃÅ ha scritto:
> + /*
> + * Return 0 for coalesced interrupts; for edge-triggered interrupts,
> + * this only happens if a previous edge has not been delivered due
> + * do masking. For level interrupts, the remote_irr field tells
(^ to)
> + * us if the interrupt is waiting for an EOI.

How do we know we haven't delivered an edge-triggered interrupt when
ioapic_service() always clears this IRR bit?

We know we have at least delivered it to the local APIC(s). If it is masked in the ioredirtbl, ioapic_service doesn't clear the IRR.

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