From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752272AbdADKNr (ORCPT ); Wed, 4 Jan 2017 05:13:47 -0500 Received: from szxga01-in.huawei.com ([58.251.152.64]:19365 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751759AbdADKNL (ORCPT ); Wed, 4 Jan 2017 05:13:11 -0500 Message-ID: <586CCA5A.8050607@huawei.com> Date: Wed, 4 Jan 2017 18:11:38 +0800 From: Xishi Qiu User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , the arch/x86 maintainers , , Andrew Morton , , CC: LKML , Fengtiantian , Xiexiuqi Subject: [RFC PATCH] x86: call smp vmxoff in smp stop Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.177.25.179] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020206.586CCA69.03BB,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: ae99a89724080242af5fd3beac17e11f Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: f00186668 We need to disable VMX on all CPUs before stop cpu when OS panic, otherwisewe risk hanging up the machine, because the CPU ignore INIT signals when VMX is enabled. In kernel mainline this issue existence. Signed-off-by: f00186668 --- arch/x86/kernel/smp.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c index 68f8cc2..6b64c6b 100644 --- a/arch/x86/kernel/smp.c +++ b/arch/x86/kernel/smp.c @@ -162,6 +162,7 @@ static int smp_stop_nmi_callback(unsigned int val, struct pt_regs *regs) if (raw_smp_processor_id() == atomic_read(&stopping_cpu)) return NMI_HANDLED; + cpu_emergency_vmxoff(); stop_this_cpu(NULL); return NMI_HANDLED; @@ -174,6 +175,7 @@ static int smp_stop_nmi_callback(unsigned int val, struct pt_regs *regs) asmlinkage __visible void smp_reboot_interrupt(void) { ipi_entering_ack_irq(); + cpu_emergency_vmxoff(); stop_this_cpu(NULL); irq_exit(); } -- 1.8.3.1