linux-kernel - Re: [PATCH] x86/mce: Add Skylake quirk for patrol scrub reported errors

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Message-ID: <20210324150004.GG5010@zn.tnic>
Date:   Wed, 24 Mar 2021 16:00:04 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Tony Luck <tony.luck@...el.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Youquan Song <youquan.song@...el.com>
Subject: Re: [PATCH] x86/mce: Add Skylake quirk for patrol scrub reported
 errors

On Mon, Mar 22, 2021 at 03:37:10PM -0700, Tony Luck wrote:
> From: Youquan Song <youquan.song@...el.com>
> 
> Skylake has a mode where the system administrator can use a BIOS setup
> option to request that the memory controller report uncorrected errors
> found by the patrol scrubber as corrected.  This results in them being
> signalled using CMCI, which is less disruptive than a machine check.
> 
> Add a quirk to detect that a "corrected" error is actually a downgraded
> uncorrected error with model specific checks for the "MSCOD" signature in
> MCi_STATUS and that the error was reported from a memory controller bank.
> 
> Adjust the severity to MCE_AO_SEVERITY so that Linux will try to take
> the affected page offline.
> 
> [Tony: Wordsmith commit comment]
> 
> Signed-off-by: Youquan Song <youquan.song@...el.com>
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> 
> ---
> Repost ... looks like this got lost somewhere.

Yeah, into

fd258dc4442c ("x86/mce: Add Skylake quirk for patrol scrub reported errors")

:-)

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette