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Subject: Re: [PATCH V3] x86: call smp vmxoff in smp stop
To: Xishi Qiu <qiuxishi@huawei.com>, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
        the arch/x86 maintainers <x86@kernel.org>, wanpeng.li@hotmail.com,
        Andrew Morton <akpm@linux-foundation.org>,
        hidehiro.kawai.ez@hitachi.com
References: <586CCA5A.8050607@huawei.com> <586DA529.1040803@huawei.com>
 <58798201.2@huawei.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Fengtiantian <fengtiantian@huawei.com>, Xiexiuqi <xiexiuqi@huawei.com>
From: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <9b0db9ff-19aa-5687-dac0-dc2fa2337cc0@redhat.com>
Date: Tue, 17 Jan 2017 16:18:20 +0100
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On 14/01/2017 02:42, Xishi Qiu wrote:
> From: Tiantian Feng <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: Tiantian Feng <fengtiantian@huawei.com>

Xishi,

it's still missing your Signed-off-by.

Paolo

> ---
>  arch/x86/kernel/smp.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c
> index 68f8cc2..b574d55 100644
> --- a/arch/x86/kernel/smp.c
> +++ b/arch/x86/kernel/smp.c
> @@ -33,6 +33,7 @@
>  #include <asm/mce.h>
>  #include <asm/trace/irq_vectors.h>
>  #include <asm/kexec.h>
> +#include <asm/virtext.h>
>  
>  /*
>   *	Some notes on x86 processor bugs affecting SMP operation:
> @@ -162,6 +163,7 @@ 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 +176,7 @@ 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();
>  }
>