From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933185Ab2K0D17 (ORCPT ); Mon, 26 Nov 2012 22:27:59 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:8709 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S933078Ab2K0D15 (ORCPT ); Mon, 26 Nov 2012 22:27:57 -0500 X-IronPort-AV: E=Sophos;i="4.83,325,1352044800"; d="scan'208";a="6280661" Message-ID: <50B432CA.70804@cn.fujitsu.com> Date: Tue, 27 Nov 2012 11:26:02 +0800 From: Zhang Yanfei 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" , Marcelo Tosatti , Gleb Natapov , "Eric W. Biederman" CC: "kexec@lists.infradead.org" , "kvm@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: [PATCH v9 1/2] x86/kexec: VMCLEAR VMCSs loaded on all cpus if necessary References: <50B43299.9030409@cn.fujitsu.com> In-Reply-To: <50B43299.9030409@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/11/27 11:27:31, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/11/27 11:27:31, Serialize complete at 2012/11/27 11:27:31 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 This patch 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. Signed-off-by: Zhang Yanfei --- arch/x86/include/asm/kexec.h | 2 ++ arch/x86/kernel/crash.c | 25 +++++++++++++++++++++++++ 2 files changed, 27 insertions(+), 0 deletions(-) diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h index 317ff17..28feeba 100644 --- a/arch/x86/include/asm/kexec.h +++ b/arch/x86/include/asm/kexec.h @@ -163,6 +163,8 @@ struct kimage_arch { }; #endif +extern void (*crash_vmclear_loaded_vmcss)(void); + #endif /* __ASSEMBLY__ */ #endif /* _ASM_X86_KEXEC_H */ diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c index 13ad899..4a2a12f 100644 --- a/arch/x86/kernel/crash.c +++ b/arch/x86/kernel/crash.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -29,6 +30,20 @@ #include int in_crash_kexec; + +/* + * This is used to VMCLEAR all VMCSs loaded on the + * processor. And when loading kvm_intel module, the + * callback function pointer will be assigned. + */ +void (*crash_vmclear_loaded_vmcss)(void) = NULL; +EXPORT_SYMBOL_GPL(crash_vmclear_loaded_vmcss); + +static inline void cpu_emergency_vmclear_loaded_vmcss(void) +{ + if (crash_vmclear_loaded_vmcss) + crash_vmclear_loaded_vmcss(); +} #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC) @@ -46,6 +61,11 @@ static void kdump_nmi_callback(int cpu, struct pt_regs *regs) #endif crash_save_cpu(regs, cpu); + /* + * VMCLEAR VMCSs loaded on all cpus if needed. + */ + cpu_emergency_vmclear_loaded_vmcss(); + /* Disable VMX or SVM if needed. * * We need to disable virtualization on all CPUs. @@ -88,6 +108,11 @@ void native_machine_crash_shutdown(struct pt_regs *regs) kdump_nmi_shootdown_cpus(); + /* + * VMCLEAR VMCSs loaded on this cpu if needed. + */ + cpu_emergency_vmclear_loaded_vmcss(); + /* Booting kdump kernel with VMX or SVM enabled won't work, * because (among other limitations) we can't disable paging * with the virt flags. -- 1.7.1