linux-kernel - Re: [PATCH v2 3/4] KVM: ioapic: extract body of kvm_ioapic_set

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Message-ID: <532E9EEF.2080906@redhat.com>
Date:	Sun, 23 Mar 2014 09:44:31 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>
CC:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, gleb@...nel.org,
	mtosatti@...hat.com, alex.williamson@...hat.com,
	jan.kiszka@...mens.com
Subject: Re: [PATCH v2 3/4] KVM: ioapic: extract body of kvm_ioapic_set_irq

Il 21/03/2014 19:58, Radim Krčmář 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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