linux-kernel - Re: [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes

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Message-ID: <4910AB3F.3010205@goop.org>
Date:	Tue, 04 Nov 2008 12:06:23 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Alexander van Heukelum <heukelum@...tmail.fm>,
	Andi Kleen <andi@...stfloor.org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Alexander van Heukelum <heukelum@...lshack.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>, lguest@...abs.org,
	jeremy@...source.com, Steven Rostedt <srostedt@...hat.com>,
	Mike Travis <travis@....com>
Subject: Re: [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes

H. Peter Anvin wrote:
> - we can no longer redirect a stub away from common code by
>   changing the branch in that slot.  We have to instead modify
>   the IDT.  This means "dedicated" interrupts don't get the
>   vector number at all, which is probably fine -- to be honest,
>   I'm not sure if they do at the moment either.
>   

They do, and the various patches to multiplex things like IPIs across 
multiple vectors rely on it.

    J
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