Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932300Ab2JaDbz (ORCPT ); Tue, 30 Oct 2012 23:31:55 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:7295 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751944Ab2JaDbx (ORCPT ); Tue, 30 Oct 2012 23:31:53 -0400 X-IronPort-AV: E=Sophos;i="4.80,684,1344182400"; d="scan'208";a="6104029" Message-ID: <50909B55.2070901@cn.fujitsu.com> Date: Wed, 31 Oct 2012 11:30:29 +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 v3 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 2012/10/31 11:31:08, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/31 11:31:08, Serialize complete at 2012/10/31 11:31:08 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=GB2312 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1355 Lines: 31 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 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: make crash_clear_loaded_vmcss valid when loading kvm_intel module arch/x86/include/asm/kexec.h | 2 ++ arch/x86/kernel/crash.c | 25 +++++++++++++++++++++++++ arch/x86/kvm/vmx.c | 9 +++++++++ 3 files changed, 36 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/