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Date:	Sun, 21 Apr 2013 15:35:41 -0700
From:	"H. Peter Anvin" <>
To:	Borislav Petkov <>
CC:	Andi Kleen <>,,, Andi Kleen <>
Subject: Re: [PATCH] x86: Fix AMD K6 indirect call check v2

On 04/21/2013 10:44 AM, Borislav Petkov wrote:
> But I have hard time understanding what that test with the 10^6 loop
> iterations is supposed to achieve. And what makes sure that the RDTSCs
> don't get reordered? Or maybe K6 wasn't reordering that aggressively...
> Erratum says "unpredictable system behavior" but it seems it wasn't that
> unpredictable after all - otherwise the fix would've been "HLT" right
> then and there. :)

Looks like it is just trying to sense the bug... but then it doesn't
actually do anything about it.  At least it should taint the kernel.


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