From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mga09.intel.com ([134.134.136.24]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1ckxMm-0000xh-4o for kexec@lists.infradead.org; Mon, 06 Mar 2017 18:28:17 +0000 Date: Mon, 6 Mar 2017 10:27:54 -0800 From: "Luck, Tony" Subject: Re: [PATCH v4] x86/mce: Don't participate in rendezvous process once nmi_shootdown_cpus() was made Message-ID: <20170306182754.GB29163@intel.com> References: <1487857012-9059-1-git-send-email-xlpang@redhat.com> <20170306111654.xmmizzae4assppk3@pd.tnic> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20170306111654.xmmizzae4assppk3@pd.tnic> 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" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Borislav Petkov Cc: Prarit Bhargava , Kiyoshi Ueda , Xunlei Pang , x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Ingo Molnar , Junichi Nomura , Naoya Horiguchi , Dave Young On Mon, Mar 06, 2017 at 12:16:54PM +0100, Borislav Petkov wrote: > On Thu, Feb 23, 2017 at 09:36:52PM +0800, Xunlei Pang wrote: > > We met an issue for kdump: after kdump kernel boots up, > > and there comes a broadcasted mce in first kernel, the > > other cpus remaining in first kernel will enter the old > > mce handler of first kernel, then timeout and panic due > > to MCE synchronization, finally reset the kdump cpus. > > > > This patch lets cpus stay quiet after nmi_shootdown_cpus(), > > so after kdump boots, cpus remaining in 1st kernel should > > not do anything except clearing MCG_STATUS. This is useful > > for kdump to let vmcore dumping perform as hard as it can. > > Ok, I went and rewrote the text to make it more succinct, to the point > and correct spelling and formatting. > > Tony, ACK? Yes. Looks good now. Acked-by: Tony Luck -Tony _______________________________________________ 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 S1754101AbdCFSbL (ORCPT ); Mon, 6 Mar 2017 13:31:11 -0500 Received: from mga07.intel.com ([134.134.136.100]:57625 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752850AbdCFSbD (ORCPT ); Mon, 6 Mar 2017 13:31:03 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.35,254,1484035200"; d="scan'208";a="831573342" Date: Mon, 6 Mar 2017 10:27:54 -0800 From: "Luck, Tony" To: Borislav Petkov Cc: Xunlei Pang , x86@kernel.org, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, Ingo Molnar , Dave Young , Prarit Bhargava , Junichi Nomura , Kiyoshi Ueda , Naoya Horiguchi Subject: Re: [PATCH v4] x86/mce: Don't participate in rendezvous process once nmi_shootdown_cpus() was made Message-ID: <20170306182754.GB29163@intel.com> References: <1487857012-9059-1-git-send-email-xlpang@redhat.com> <20170306111654.xmmizzae4assppk3@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170306111654.xmmizzae4assppk3@pd.tnic> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 06, 2017 at 12:16:54PM +0100, Borislav Petkov wrote: > On Thu, Feb 23, 2017 at 09:36:52PM +0800, Xunlei Pang wrote: > > We met an issue for kdump: after kdump kernel boots up, > > and there comes a broadcasted mce in first kernel, the > > other cpus remaining in first kernel will enter the old > > mce handler of first kernel, then timeout and panic due > > to MCE synchronization, finally reset the kdump cpus. > > > > This patch lets cpus stay quiet after nmi_shootdown_cpus(), > > so after kdump boots, cpus remaining in 1st kernel should > > not do anything except clearing MCG_STATUS. This is useful > > for kdump to let vmcore dumping perform as hard as it can. > > Ok, I went and rewrote the text to make it more succinct, to the point > and correct spelling and formatting. > > Tony, ACK? Yes. Looks good now. Acked-by: Tony Luck -Tony