Re: [PATCH] x86: Fix AMD K6 indirect call check v2

[H. Peter Anvin]

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.

	-hpa


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/