linux-kernel - Re: [RFC] x86/mce: Add workaround for SKX/CLX/CPX spurious machine checks

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Message-ID: <CAPcxDJ7nriZEJHF6dMPR7tQ+dGuueyRjw1NC+4CbjxiAT_S+ZA@mail.gmail.com>
Date:   Tue, 8 Feb 2022 07:04:26 -0800
From:   Jue Wang <juew@...gle.com>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Borislav Petkov <bp@...en8.de>, "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: [RFC] x86/mce: Add workaround for SKX/CLX/CPX spurious machine checks

Thanks for the feedback, Tony and Borislav.

I will send out an updated patch.

Thanks,
-Jue

On Mon, Feb 7, 2022 at 1:51 PM Luck, Tony <tony.luck@...el.com> wrote:
>
> >> The erratum has made its way through to the public specification
> >> update yet :-(
> >
> > You mean "has not"?
>
> Curse my pathetic typing skills ... "has NOT made its way" is where we are today.
> I don't know when that status will change.
>
> > In any case, I guess you could say something like:
> >
> >       pr_err_once("Erratum #XXX detected, disabling fast string copy instructions.\n");
> >
> > or so and people can search with the erratum number later where the doc
> > will explain it in more detail.
>
> When the errata (plural, there are separate lists for SKX and CLX) go public
> we could update this message with the names.
We've found this message in combination with logging about the
faulting process info
in do_machine_check helpful when analyzing the originating context of the MCEs.
>
> -Tony