From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lb0-f176.google.com (mail-lb0-f176.google.com [209.85.217.176]) by kanga.kvack.org (Postfix) with ESMTP id 552676B0003 for ; Mon, 21 Dec 2015 13:19:12 -0500 (EST) Received: by mail-lb0-f176.google.com with SMTP id bc4so19562290lbc.2 for ; Mon, 21 Dec 2015 10:19:12 -0800 (PST) Received: from mail.skyhub.de (mail.skyhub.de. [2a01:4f8:120:8448::d00d]) by mx.google.com with ESMTP id n5si9389878lfi.20.2015.12.21.10.19.10 for ; Mon, 21 Dec 2015 10:19:10 -0800 (PST) Date: Mon, 21 Dec 2015 19:18:54 +0100 From: Borislav Petkov Subject: Re: [PATCHV3 1/3] x86, ras: Add new infrastructure for machine check fixup tables Message-ID: <20151221181854.GF21582@pd.tnic> References: <2e91c18f23be90b33c2cbfff6cce6b6f50592a96.1450283985.git.tony.luck@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <2e91c18f23be90b33c2cbfff6cce6b6f50592a96.1450283985.git.tony.luck@intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Tony Luck Cc: Ingo Molnar , Andrew Morton , Andy Lutomirski , Dan Williams , Elliott@pd.tnic, Robert , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-nvdimm@ml01.01.org, x86@kernel.org On Tue, Dec 15, 2015 at 05:29:30PM -0800, Tony Luck wrote: > Copy the existing page fault fixup mechanisms to create a new table > to be used when fixing machine checks. Note: > 1) At this time we only provide a macro to annotate assembly code > 2) We assume all fixups will in code builtin to the kernel. > 3) Only for x86_64 > 4) New code under CONFIG_MCE_KERNEL_RECOVERY (default 'n') > > Signed-off-by: Tony Luck > --- > arch/x86/Kconfig | 10 ++++++++++ > arch/x86/include/asm/asm.h | 10 ++++++++-- > arch/x86/include/asm/mce.h | 14 ++++++++++++++ > arch/x86/kernel/cpu/mcheck/mce.c | 16 ++++++++++++++++ > arch/x86/kernel/vmlinux.lds.S | 6 +++++- > arch/x86/mm/extable.c | 19 +++++++++++++++++++ > include/asm-generic/vmlinux.lds.h | 12 +++++++----- > 7 files changed, 79 insertions(+), 8 deletions(-) > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 96d058a87100..42d26b4d1ec4 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -1001,6 +1001,16 @@ config X86_MCE_INJECT > If you don't know what a machine check is and you don't do kernel > QA it is safe to say n. > > +config MCE_KERNEL_RECOVERY > + bool "Recovery from machine checks in special kernel memory copy functions" > + default n > + depends on X86_MCE && X86_64 Still no dependency on CONFIG_LIBNVDIMM. > + ---help--- > + This option provides a new memory copy function mcsafe_memcpy() > + that is annotated to allow the machine check handler to return > + to an alternate code path to return an error to the caller instead > + of crashing the system. Say yes if you have a driver that uses this. > + -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. -- 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