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

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Date:	Thu, 27 Nov 2008 12:59:29 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	lguest@...abs.org, jeremy@...source.com,
	LKML <linux-kernel@...r.kernel.org>,
	Mike Travis <travis@....com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Alexander van Heukelum <heukelum@...lshack.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Lguest] [PATCH RFC/RFB] x86_64,	i386: interrupt dispatch changes

Andi Kleen wrote:
>> Nice.  Can actually go to zero, by pointing the IDT at (unmapped_area + 
>> vector), and deducing the vector in the page fault handler from cr2.
>>     
>
> That would be still one byte, otherwise you wouldn't get a unique index.
>   

One virtual byte; zero physical bytes.  unmapped_area above need not be 
mapped.

-- 
error compiling committee.c: too many arguments to function

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