From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751429Ab2JSFnh (ORCPT ); Fri, 19 Oct 2012 01:43:37 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:15521 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751014Ab2JSFng (ORCPT ); Fri, 19 Oct 2012 01:43:36 -0400 X-IronPort-AV: E=Sophos;i="4.80,611,1344182400"; d="scan'208";a="6028295" Message-ID: <5080E813.7030302@cn.fujitsu.com> Date: Fri, 19 Oct 2012 13:41:39 +0800 From: Zhang Yanfei User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.9) Gecko/20100921 Fedora/3.1.4-1.fc14 Thunderbird/3.1.4 MIME-Version: 1.0 To: x86@kernel.org, kexec@lists.infradead.org, Avi Kivity , mtosatti@redhat.com CC: linux-kernel@vger.kernel.org, "kvm@vger.kernel.org" Subject: [PATCH v2 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 2012/10/19 13:42:32, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/19 13:42:32, Serialize complete at 2012/10/19 13:42:32 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 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 v1 to v2: 1. remove the sysctl and clear VMCSs unconditionally. zhangyanfei (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 | 27 +++++++++++++++++++++++++++ arch/x86/kvm/vmx.c | 9 +++++++++ 3 files changed, 38 insertions(+), 0 deletions(-)