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

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Message-ID: <20200617184901.GA387@agluck-desk2.amr.corp.intel.com>
Date:   Wed, 17 Jun 2020 11:49:01 -0700
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "Song, Youquan" <youquan.song@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/mce: Add Skylake quirk for patrol scrub reported
 errors

On Wed, Jun 17, 2020 at 09:41:58AM +0200, Borislav Petkov wrote:
> On Tue, Jun 16, 2020 at 10:33:08PM +0000, Luck, Tony wrote:
> > If the BIOS option is left in the default setting, uncorrectable errors found
> > by the patrol scrubber are reported with a machine check. Those MSCOD
> > and MCACOD signatures are the same ... but that's not important because
> > MCi_STATUS.UC==1. So Linux doesn't need to jump through hoops to
> > "upgrade" the severity.
> 
> No, this is not what I meant: I meant when you have the setting enabled
> to downgrade those errors, can they be detected as part of another MCE
> being raised...

Yes one of these downgraded error logs could be sitting in a bank
whe a different machine check fires. But the severity calculation will
ignore it as MCi_STATUS.EN==0

-Tony