linux-kernel - Re: [RFC PATCH] x86 NMI-safe INT3 and Page Fault (v2)

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Message-ID: <20080418004800.GA7758@Krystal>
Date:	Thu, 17 Apr 2008 20:48:00 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	akpm@...l.org, "H. Peter Anvin" <hpa@...or.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Zachary Amsden <zach@...are.com>
Subject: Re: [RFC PATCH] x86 NMI-safe INT3 and Page Fault (v2)

* Jeremy Fitzhardinge (jeremy@...p.org) wrote:
> Ingo Molnar wrote:
>> * Ingo Molnar <mingo@...e.hu> wrote:
>>
>>   
>>> thanks Mathieu, i've picked this up into x86.git for more testing.
>>>     
>>
>> ... but had to drop it due to missing PARAVIRT support which broke the 
>> build. I guess on paravirt we could just initially define 
>> INTERRUPT_RETURN_NMI_SAFE to iret, etc.?
>
> I have not yet implemented Xen's support for paravirtual NMI, so there's no 
> scope for breaking anything from my perspective.  When I get around to NMI, 
> I'll work around whatever's there.  I don't know if lguest or VMI has any 
> guest NMI support.
>
>    J
>

I wonder if we could simply paravirtualize the popf instruction, which
seems to be the only one requiring to run in ring 0.

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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