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

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Date:   Fri, 18 Feb 2022 22:38:10 +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.

> do we really need that printk in there?

I think we do. That CPU is now running in degraded mode (fast strings disabled) ... sysadmins will want to know that.

> If so, we can sandwich around it with nstrumentation_begin() and _end()...

I guess so ... this stuff is all Greek to me.

-Tony