linux-kernel - RE: [PATCH v2] x86/mce: work around an erratum on fast string copy instructions.

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Message-ID: <dca14efd34294fe1b58d21a230fe6f11@intel.com>
Date:   Fri, 18 Feb 2022 17:58:42 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Borislav Petkov <bp@...en8.de>, Jue Wang <juew@...gle.com>
CC:     "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "patches@...ts.linux.dev" <patches@...ts.linux.dev>
Subject: RE: [PATCH v2] x86/mce: work around an erratum on fast string copy
 instructions.

> Also, Tony, I think the clearing of MCG_STATUS should happen last.

Yes. There's a race if another #MC comes in after MCIP is cleared, but before we get
off the machine check stack. Should make that window as small as possible.

-Tony