linux-kernel - Re: [PATCH 0/8] KVM: minor APIC fixes and cleanups

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Message-ID: <54CBA21D.6050506@redhat.com>
Date:	Fri, 30 Jan 2015 16:24:13 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>
CC:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Nadav Amit <namit@...technion.ac.il>,
	Gleb Natapov <gleb@...nel.org>
Subject: Re: [PATCH 0/8] KVM: minor APIC fixes and cleanups



On 30/01/2015 16:20, Radim Krčmář wrote:
>> > +	/* XXX: A superset of x2APIC broadcasts is fine in practice as long as
>> > +	 * we don't support APIC ID > 0xfeffffff.
>> > +	 */
>> > 
>> > It's ugly. :)
> Yeah, there is: don't deliver x2APIC broadcasts to xAPIC.
> (I'm not even sure if it is correct ...)
> 
> Without that delivery, we could do something like
>   if (irq->dest_id == (x2apic_ipi ? X2APIC_BROADCAST : APIC_BROADCAST))

Nadav, do you know what real hardware does?

Paolo
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