linux-kernel - Re: [PATCH] x86: prevent unconditional writes to DebugCtl MSR

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Message-ID: <20080310171409.GA24133@elte.hu>
Date:	Mon, 10 Mar 2008 18:14:09 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jan Beulich <jbeulich@...ell.com>
Cc:	tglx@...utronix.de, hpa@...or.com, markus.t.metzger@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: prevent unconditional writes to DebugCtl MSR


* Jan Beulich <jbeulich@...ell.com> wrote:

> Otherwise, enabling (or better, subsequent disabling) of single 
> stepping would cause a kernel oops on CPUs not having this MSR.
> 
> The patch could have been added a conditional to the MSR write in 
> user_disable_single_step(), but centralizing the updates seems safer 
> and (looking forward) better manageable.

thanks Jan, applied.

	Ingo
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