linux-kernel - Re: [PATCH 1/3] x86/MCE, EDAC/mce_amd: Add support for new MCA

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Message-ID: <Yr2CpuL+JHWblJMD@zn.tnic>
Date:   Thu, 30 Jun 2022 13:01:58 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Yazen Ghannam <yazen.ghannam@....com>
Cc:     linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        tony.luck@...el.com, x86@...nel.org,
        Smita.KoralahalliChannabasappa@....com
Subject: Re: [PATCH 1/3] x86/MCE, EDAC/mce_amd: Add support for new
 MCA_SYND{1,2} registers

On Mon, Apr 18, 2022 at 05:44:38PM +0000, Yazen Ghannam wrote:
> Future Scalable MCA systems will include two new registers: MCA_SYND1
> and MCA_SYND2.
> 
> These registers will include supplemental error information in addition
> to the existing MCA_SYND register. The data within the registers is
> considered valid if MCA_STATUS[SyndV] is set.
> 
> Add fields for these registers in struct mce. Save and print these
> registers wherever MCA_STATUS[SyndV]/MCA_SYND is currently used.

That's all fine and good but what kind of supplemental error information
are we talking about here? Example?

And how is that error info going to be used in luserspace?

I don't want to increase struct mce record size by 16 bytes and those
end up unused.

Can the information from MCA_SYND{,1,2} be synthesized into a smaller
quantity an then fed to userspace?

Thx.

-- 
Regards/Gruss,
    Boris.

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