On Thu, Apr 07, 2016 at 06:40:13PM -0700, Andy Lutomirski wrote:
> Ingo, etc: we should probably apply one of those patches with a
> -stable tag (to mitigate the otherwise potentially unpleasant
> performance regression in here), but I don't really care which one.
> Andi's has a name for the bug th
On Thu, Apr 7, 2016 at 5:31 PM, Andy Lutomirski wrote:
> From: Borislav Petkov
>
> Erratum 88 affects old AMD K8s, where a SWAPGS fails to cause an input
> dependency on GS. Therefore, we need to MFENCE before it.
>
> But that MFENCE is expensive and unnecessary on the remaining x86 CPUs
> out th
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