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

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Message-ID: <CALCETrUK1raRagO=JxCRpy0_eKfS56gce737fVe9rtJqNwH+_A@mail.gmail.com>
Date:	Fri, 11 Dec 2015 14:38:13 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	"Williams, Dan J" <dan.j.williams@...el.com>,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linux-nvdimm <linux-nvdimm@...1.01.org>, X86 ML <x86@...nel.org>
Subject: Re: [PATCHV2 3/3] x86, ras: Add mcsafe_memcpy() function to recover
 from machine checks

On Fri, Dec 11, 2015 at 2:35 PM, Luck, Tony <tony.luck@...el.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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