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

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Date:	Thu, 27 Nov 2008 12:13:43 +0200
From:	Avi Kivity <avi@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	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>,
	Andi Kleen <andi@...stfloor.org>, 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

H. Peter Anvin wrote:
>
>> I suspect we could get it down to three bytes, by sharing the last 
>> byte of the four-byte call sequence with the first byte of the next:
>>
>>  66 e8 ff 66 e8 fc 66 e8 f9 66 e8 f6 ...
>>
>> Every three bytes a new stub begins; it's a four-byte call to offset 
>> 0x6703 relative to the beginning of the first stub.
>>
>> Can anyone better 24 bits/stub?
>
> On the entirely silly level...
>
> CC xx

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.

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

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