Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932807Ab2KNJar (ORCPT ); Wed, 14 Nov 2012 04:30:47 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:24153 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1754446Ab2KNJap (ORCPT ); Wed, 14 Nov 2012 04:30:45 -0500 X-IronPort-AV: E=Sophos;i="4.83,249,1352044800"; d="scan'208";a="6195895" Message-ID: <50A3645F.60302@cn.fujitsu.com> Date: Wed, 14 Nov 2012 17:29:03 +0800 From: zhangyanfei User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.8) Gecko/20121012 Thunderbird/10.0.8 MIME-Version: 1.0 To: "x86@kernel.org" , "kexec@lists.infradead.org" , Avi Kivity , Marcelo Tosatti CC: "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" Subject: [PATCH v4 0/2] x86: clear vmcss on all cpus when doing kdump if necessary X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/11/14 17:30:38, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/11/14 17:30:39, Serialize complete at 2012/11/14 17:30:39 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1517 Lines: 37 Currently, kdump just makes all the logical processors leave VMX operation by executing VMXOFF instruction, so any VMCSs active on the logical processors may be corrupted. But, sometimes, we need the VMCSs to debug guest images contained in the host vmcore. To prevent the corruption, we should VMCLEAR the VMCSs before executing the VMXOFF instruction. The patch set provides a way to VMCLEAR vmcss related to guests on all cpus before executing the VMXOFF when doing kdump. This is used to ensure the VMCSs in the vmcore updated and non-corrupted. Changelog from v3 to v4: 1. add a new percpu variable vmclear_skipped to skip vmclear in kdump in some conditions. Changelog from v2 to v3: 1. remove unnecessary conditions in function cpu_emergency_clear_loaded_vmcss as Marcelo suggested. Changelog from v1 to v2: 1. remove the sysctl and clear VMCSs unconditionally. Zhang Yanfei (2): x86/kexec: VMCLEAR vmcss on all cpus if necessary KVM: set/unset crash_clear_loaded_vmcss and vmclear_skipped in kvm_intel module arch/x86/include/asm/kexec.h | 3 +++ arch/x86/kernel/crash.c | 32 ++++++++++++++++++++++++++++++++ arch/x86/kvm/vmx.c | 32 ++++++++++++++++++++++++++++++++ 3 files changed, 67 insertions(+), 0 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/