From: "Luck, Tony" <tony.luck@intel.com>
To: Borislav Petkov <bp@alien8.de>,
        Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
CC: Naoya Horiguchi <nao.horiguchi@gmail.com>, Vivek Goyal <vgoyal@redhat.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Junichi Nomura <j-nomura@ce.jp.nec.com>,
        Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Subject: RE: [PATCH 1/2] x86: mce: kdump: use under_crashdumping to turn off
 MCE in all CPUs together
Thread-Topic: [PATCH 1/2] x86: mce: kdump: use under_crashdumping to turn
 off MCE in all CPUs together
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Date: Tue, 24 Feb 2015 18:20:16 +0000
Message-ID: <3908561D78D1C84285E8C5FCA982C28F329EB977@ORSMSX114.amr.corp.intel.com>
References: <1424682719-16493-1-git-send-email-n-horiguchi@ah.jp.nec.com>
 <20150223092739.GA22757@pd.tnic> <54EB24BE.5050006@gmail.com>
 <20150223135842.GA22753@pd.tnic> <54EB4A17.6020800@gmail.com>
 <20150223170653.GA16699@pd.tnic>
 <20150224081517.GB2918@hori1.linux.bs1.fc.nec.co.jp>
 <20150224095616.GB3420@pd.tnic>
In-Reply-To: <20150224095616.GB3420@pd.tnic>
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> I'd even venture a guess and say that clearing CR4.MCE should be enough
> but I *think* that doesn't prevent errors from being logged. Just to be
> extra sure, you should clear MCG_CTL bits too. It all depends on what
> exactly you want to do.

I'm not sure - the broadcast MCE will still arrive at that cpu - and with CR4.MCE==0, it will shutdown.
Not sure if that just affects that logical thread, or if it pulls a signal line to take down the whole machine.

-Tony
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