linux-kernel - Re: [PATCH v6 1/2] acpi: apei: Rename ghes_severity() to ghes_cper

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Date:   Tue, 22 May 2018 13:49:04 -0500
From:   "Alex G." <mr.nuke.me@...il.com>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Borislav Petkov <bp@...en8.de>, alex_gagniuc@...lteam.com,
        austin_bolen@...l.com, shyam_iyer@...l.com,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Tyler Baicar <tbaicar@...eaurora.org>,
        Will Deacon <will.deacon@....com>,
        James Morse <james.morse@....com>,
        Shiju Jose <shiju.jose@...wei.com>,
        "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>,
        Dongjiu Geng <gengdongjiu@...wei.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 1/2] acpi: apei: Rename ghes_severity() to
 ghes_cper_severity()

On 05/22/2018 01:45 PM, Luck, Tony wrote:
> On Tue, May 22, 2018 at 01:19:34PM -0500, Alex G. wrote:
>> Firmware started passing "fatal" GHES headers with the explicit intent of
>> crashing an OS. At the same time, we've learnt how to handle these errors in
>> a number of cases. With DPC (coming soon to firmware-first) the error is
>> contained, and a non-issue.
> 
> Perhaps DPC is the change that you need to emphasize as to
> why things are different now, so we can change the default
> Linux behavior.
> 
> With the h/w guaranteeing that corrupt data is contained, we
> should be safe to disregard BIOS indications of "fatal" problems
> that could be anything and might show up in unknown ways some
> time later if we keep running.

Sure. DPC is much harder to contest as a reason. However, the AER path
benefits as well from this change in behavior. I'm certain there are
other classes of errors that benefit as well from the change, though I
haven't had the time or the inclination to look for them.

Alex