From: Arjan van de Ven <arjan@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
Jason Baron <jbaron@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>, Andi Kleen <ak@suse.de>,
linux-kernel@vger.kernel.org
Subject: Re: Immediate values
Date: Fri, 25 Sep 2009 08:51:19 +0200 [thread overview]
Message-ID: <20090925085119.2b77ea04@infradead.org> (raw)
In-Reply-To: <20090924193422.GB2533@elte.hu>
On Thu, 24 Sep 2009 21:34:22 +0200
Ingo Molnar <mingo@elte.hu> wrote:
>
> * H. Peter Anvin <hpa@zytor.com> wrote:
>
> > I would like to get an official ACK or NAK for this patching
> > technique from inside Intel, and preferrably from AMD as well. If
> > it does work as described it would provide a very clean way to do
> > one-shot alternative functions, which probably would be higher
> > value than immediate data values.
>
> Sounds tempting. Things like the CONFIG_SECURITY hookery could use it?
>
> But ... since it's patched under stopmachine, is there any reason why
> this wouldnt work?
>
stopmachine is fine.
more aggressive tricks are rather dicey.
(cross modifying code that's being executed in ring 0 is ... not
something CPU designers had in mind)
--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
next prev parent reply other threads:[~2009-09-25 6:51 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-24 12:31 Immediate values Mathieu Desnoyers
2009-09-24 12:34 ` Ingo Molnar
2009-09-24 14:02 ` Jason Baron
2009-09-24 14:10 ` H. Peter Anvin
2009-09-24 14:16 ` Mathieu Desnoyers
2009-09-24 19:16 ` Ingo Molnar
2009-09-24 19:34 ` Ingo Molnar
2009-09-25 6:51 ` Arjan van de Ven [this message]
2009-09-25 7:35 ` Mathieu Desnoyers
2009-09-25 8:25 ` Arjan van de Ven
2009-09-25 10:02 ` Alan Cox
2009-09-25 10:14 ` Arjan van de Ven
2009-09-25 16:19 ` H. Peter Anvin
2009-09-25 16:45 ` Arjan van de Ven
2009-09-25 17:05 ` H. Peter Anvin
2009-09-25 10:18 ` Richard J Moore
2009-09-25 11:12 ` Masami Hiramatsu
2009-09-24 14:16 ` H. Peter Anvin
2009-09-24 15:39 ` Jason Baron
2009-09-24 16:52 ` H. Peter Anvin
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