Re: [PATCHV2 3/3] x86, ras: Add mcsafe_memcpy() function to recover from machine checks

[Andy Lutomirski]

On Fri, Dec 11, 2015 at 2:35 PM, Luck, Tony <tony.luck@xxxxxxxxx> wrote:
>> Also, are there really PCOMMIT-capable CPUs that still forcibly
>> broadcast MCE?  If, so, that's unfortunate.
>
> PCOMMIT and LMCE arrive together ... though BIOS is in the decision
> path to enable LMCE, so it is possible that some systems could still
> broadcast if the BIOS writer decides to not allow local.

I really wish Intel would stop doing that.

>
> But a machine check safe copy_from_user() would be useful
> current generation cpus that broadcast all the time.

Fair enough.

--Andy
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