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

[Paolo Bonzini]

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.

Paolo
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