From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f173.google.com (mail-ob0-f173.google.com [209.85.214.173]) by kanga.kvack.org (Postfix) with ESMTP id CB8A16B0253 for ; Fri, 11 Dec 2015 17:38:33 -0500 (EST) Received: by obc18 with SMTP id 18so93097490obc.2 for ; Fri, 11 Dec 2015 14:38:33 -0800 (PST) Received: from mail-oi0-x236.google.com (mail-oi0-x236.google.com. [2607:f8b0:4003:c06::236]) by mx.google.com with ESMTPS id u132si2774013oif.139.2015.12.11.14.38.33 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 11 Dec 2015 14:38:33 -0800 (PST) Received: by oiww189 with SMTP id w189so70700695oiw.3 for ; Fri, 11 Dec 2015 14:38:33 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <3908561D78D1C84285E8C5FCA982C28F39F82F97@ORSMSX114.amr.corp.intel.com> References: <23b2515da9d06b198044ad83ca0a15ba38c24e6e.1449861203.git.tony.luck@intel.com> <3908561D78D1C84285E8C5FCA982C28F39F82D87@ORSMSX114.amr.corp.intel.com> <3908561D78D1C84285E8C5FCA982C28F39F82EEF@ORSMSX114.amr.corp.intel.com> <3908561D78D1C84285E8C5FCA982C28F39F82F97@ORSMSX114.amr.corp.intel.com> From: Andy Lutomirski Date: Fri, 11 Dec 2015 14:38:13 -0800 Message-ID: Subject: Re: [PATCHV2 3/3] x86, ras: Add mcsafe_memcpy() function to recover from machine checks Content-Type: text/plain; charset=UTF-8 Sender: owner-linux-mm@kvack.org List-ID: To: "Luck, Tony" Cc: "Williams, Dan J" , Ingo Molnar , Borislav Petkov , Andrew Morton , Andy Lutomirski , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , linux-nvdimm , X86 ML On Fri, Dec 11, 2015 at 2:35 PM, Luck, Tony 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org