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From: Andy Lutomirski <luto@amacapital.net>
Date: Fri, 11 Dec 2015 14:38:13 -0800
Message-ID: <CALCETrUK1raRagO=JxCRpy0_eKfS56gce737fVe9rtJqNwH+_A@mail.gmail.com>
Subject: Re: [PATCHV2 3/3] x86, ras: Add mcsafe_memcpy() function to recover
 from machine checks
To: "Luck, Tony" <tony.luck@intel.com>
Cc: "Williams, Dan J" <dan.j.williams@intel.com>,
        Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Lutomirski <luto@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        linux-nvdimm <linux-nvdimm@ml01.01.org>, X86 ML <x86@kernel.org>
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On Fri, Dec 11, 2015 at 2:35 PM, Luck, Tony <tony.luck@intel.com> 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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