[RFC PATCH] x86: call smp vmxoff in smp stop

From	Xishi Qiu <qiuxishi@huawei.com>
Newsgroups	linux.kernel
Subject	[RFC PATCH] x86: call smp vmxoff in smp stop
Date	2017-01-04 11:20 +0100
Message-ID	<sVQPL-3lt-11@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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From: f00186668 <fengtiantian@huawei.com>

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 <fengtiantian@huawei.com>
---
 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

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[RFC PATCH] x86: call smp vmxoff in smp stop Xishi Qiu <qiuxishi@huawei.com> - 2017-01-04 11:20 +0100
  [RFC PATCH V2] x86: call smp vmxoff in smp stop Xishi Qiu <qiuxishi@huawei.com> - 2017-01-05 02:50 +0100
    Re: [RFC PATCH V2] x86: call smp vmxoff in smp stop Paolo Bonzini <pbonzini@redhat.com> - 2017-01-12 15:10 +0100
    [PATCH V3] x86: call smp vmxoff in smp stop Xishi Qiu <qiuxishi@huawei.com> - 2017-01-14 02:50 +0100
  Re: [PATCH] x86: call smp vmxoff in smp stop Xishi Qiu <qiuxishi@huawei.com> - 2017-01-14 02:50 +0100
  [PATCH] x86: call smp vmxoff in smp stop Xishi Qiu <qiuxishi@huawei.com> - 2017-01-14 02:50 +0100
    Re: [PATCH] x86: call smp vmxoff in smp stop kbuild test robot <lkp@intel.com> - 2017-01-15 01:50 +0100

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