From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from one.firstfloor.org ([213.235.205.2]) by canuck.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1RDmYw-0000hV-Uh for kexec@lists.infradead.org; Wed, 12 Oct 2011 00:20:47 +0000 Date: Wed, 12 Oct 2011 02:20:32 +0200 From: Andi Kleen Subject: Re: [Patch 1/4][kernel][slimdump] Add new elf-note of type NT_NOCOREDUMP to capture slimdump Message-ID: <20111012002032.GF14482@one.firstfloor.org> References: <20111003070735.GJ2223@in.ibm.com> <20111003073203.GA22694@in.ibm.com> <20111004140437.GA28306@redhat.com> <20111005071844.GB2235@in.ibm.com> <20111005152537.GB30146@redhat.com> <20111007161218.GA2297@in.ibm.com> <20111010070725.GB11577@liondog.tnic> <20111011184434.GB32316@in.ibm.com> Mime-Version: 1.0 Content-Disposition: inline In-Reply-To: <20111011184434.GB32316@in.ibm.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org To: "K.Prasad" Cc: oomichi@mxs.nes.nec.co.jp, Nick Bowler , "Luck, Tony" , Valdis.Kletnieks@vt.edu, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, tachibana@mxm.nes.nec.co.jp, Andi Kleen , Borislav Petkov , "Eric W. Biederman" , anderson@redhat.com, Vivek Goyal , crash-utility@redhat.com > So, in any case we may not be able to disable machine-check exceptions > (MCEs) only within the context of kexec'ed kernel. Let me know if I've > missed something here. You can disable signalling in the main machine check register, then you won't get any machine check interrupts. No need to mess with any CPU specific banks. See the old mce tree that kernel.org ate for a patch that just did that during the kcore copy. -Andi _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751558Ab1JLAUj (ORCPT ); Tue, 11 Oct 2011 20:20:39 -0400 Received: from one.firstfloor.org ([213.235.205.2]:49768 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750959Ab1JLAUi (ORCPT ); Tue, 11 Oct 2011 20:20:38 -0400 Date: Wed, 12 Oct 2011 02:20:32 +0200 From: Andi Kleen To: "K.Prasad" Cc: Borislav Petkov , Vivek Goyal , linux-kernel@vger.kernel.org, crash-utility@redhat.com, kexec@lists.infradead.org, Andi Kleen , "Luck, Tony" , "Eric W. Biederman" , anderson@redhat.com, tachibana@mxm.nes.nec.co.jp, oomichi@mxs.nes.nec.co.jp, Valdis.Kletnieks@vt.edu, Nick Bowler Subject: Re: [Patch 1/4][kernel][slimdump] Add new elf-note of type NT_NOCOREDUMP to capture slimdump Message-ID: <20111012002032.GF14482@one.firstfloor.org> References: <20111003070735.GJ2223@in.ibm.com> <20111003073203.GA22694@in.ibm.com> <20111004140437.GA28306@redhat.com> <20111005071844.GB2235@in.ibm.com> <20111005152537.GB30146@redhat.com> <20111007161218.GA2297@in.ibm.com> <20111010070725.GB11577@liondog.tnic> <20111011184434.GB32316@in.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20111011184434.GB32316@in.ibm.com> User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > So, in any case we may not be able to disable machine-check exceptions > (MCEs) only within the context of kexec'ed kernel. Let me know if I've > missed something here. You can disable signalling in the main machine check register, then you won't get any machine check interrupts. No need to mess with any CPU specific banks. See the old mce tree that kernel.org ate for a patch that just did that during the kcore copy. -Andi