linux-kernel - Re: [PATCH V4] x86: call smp vmxoff in smp stop

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Message-ID: <20170419080254.c3j5lwztad2fswwr@gmail.com>
Date:   Wed, 19 Apr 2017 10:02:54 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Xishi Qiu <qiuxishi@...wei.com>, Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        wanpeng.li@...mail.com, Andrew Morton <akpm@...ux-foundation.org>,
        hidehiro.kawai.ez@...achi.com, LKML <linux-kernel@...r.kernel.org>,
        Fengtiantian <fengtiantian@...wei.com>,
        Xiexiuqi <xiexiuqi@...wei.com>
Subject: Re: [PATCH V4] x86: call smp vmxoff in smp stop


* Paolo Bonzini <pbonzini@...hat.com> wrote:

> Ingo, can you put this in tip?
> 
> Thanks,
> 
> Paolo
> 
> On 18/01/2017 12:32, Xishi Qiu wrote:
> > From: Tiantian Feng <fengtiantian@...wei.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.

Yes, but the changelog is atrcious:

 - title should describe the purpose, not the implementation

 - CPU is spelled 'CPU' once, then 'cpu' _in the same sentence_!

 - typos

 - spelling

 - the last sentence doesn't even parse ...

Still it's already at V4 and comes with two signoffs and what amounts to a 
maintainer Ack??

Thanks,

	Ingo