linux-kernel - Re: [PATCH, v2] x86-64: fix CFI annotations for NMI nesting code

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Date:	Fri, 24 Feb 2012 11:47:03 -0500
From:	Steven Rostedt <srostedt@...hat.com>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH, v2] x86-64: fix CFI annotations for NMI nesting code

On Fri, 2012-02-24 at 14:54 +0000, Jan Beulich wrote:
> The saving and restoring of %rdx wasn't annotated at all, and the
> jumping over sections where state gets partly restored wasn't handled
> either.
> 
> Further, by folding the pushing of the previous frame in repeat_nmi
> into that which so far was immediately preceding restart_nmi (after
> moving the restore of %rdx ahead of that, since it doesn't get used
> anymore when pushing prior frames), annotations of the replicated
> frame creations can be made consistent too.
> 
> v2: Fully fold repeat_nmi into the normal code flow (adding a single
>     redundant instruction to the "normal" code path), thus retaining
>     the special protection of all instructions between repeat_nmi and
>     end_repeat_nmi.

Thanks, I'll start testing it.

> 
> Signed-off-by: Jan Beulich <jbeulich@...e.com>
> Cc: Steven Rostedt <srostedt@...hat.com>

FYI, please send to my rostedt@...dmis.org account. My RH account is a
second class citizen that I use to read RH status updates and such. I
don't conduct upstream work from it and I may ignore it for long periods
of time.

I author code with it just to give credit to the company that pays me,
but my SOB is always the goodmis.org account.

Thanks,

-- Steve


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