Message-ID: <4AF9ED78.3000106@zytor.com>
Date: Tue, 10 Nov 2009 14:47:20 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Willy Tarreau <w@1wt.eu>
CC: Ingo Molnar <mingo@elte.hu>, Pavel Machek <pavel@ucw.cz>,
       Avi Kivity <avi@redhat.com>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Matteo Croce <technoboy85@gmail.com>,
       Sven-Haegar Koch <haegar@sdinet.de>, linux-kernel@vger.kernel.org
Subject: Re: i686 quirk for AMD Geode
References: <4AF9B5AB.5010800@zytor.com> <4AF9C3EF.6000705@redhat.com> <4AF9C6AB.8080006@zytor.com> <20091110201602.GA26633@1wt.eu> <20091110205445.GB1407@ucw.cz> <20091110211259.GD26633@1wt.eu> <4AF9D8E2.7050205@zytor.com> <20091110220652.GE26633@1wt.eu> <4AF9E61B.5090407@zytor.com> <20091110222031.GA22911@elte.hu> <20091110224222.GA28648@1wt.eu>
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On 11/10/2009 02:42 PM, Willy Tarreau wrote:
> On Tue, Nov 10, 2009 at 11:20:31PM +0100, Ingo Molnar wrote:
>>
>> * H. Peter Anvin <hpa@zytor.com> wrote:
>>
>>> *THIS* is the kind of complexity that makes me think that having a 
>>> single source for all interpretation done in the kernel is the 
>>> preferred option.
>>
>> Definitely agreed ... The NX code is quite a maze right now, so changes 
>> to it should come generously laced with cleanups.
> 
> BTW, I don't see why we should be impacted by NX. Trying to
> execute from an NX page would return a SEGV, not SIGILL, so
> we should not be bothered, am I wrong ?

Yes.  Consider a page-crossing instruction.

	-hpa
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