linux-kernel - Re: [PATCH 1/2] Revert "x86/mce/AMD: Collect error info even if valid bits are not set"

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Message-ID: <20180326193052.GJ25548@pd.tnic>
Date:   Mon, 26 Mar 2018 21:30:52 +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
Subject: Re: [PATCH 1/2] Revert "x86/mce/AMD: Collect error info even if
 valid bits are not set"

On Mon, Mar 26, 2018 at 02:15:25PM -0500, Yazen Ghannam wrote:
> From: Yazen Ghannam <yazen.ghannam@....com>
> 
> This reverts commit 4b1e84276a6172980c5bf39aa091ba13e90d6dad.
> 
> Software uses the valid bits to decide if the values can be used for
> further processing or other actions. So setting the valid bits will have
> software act on values that it shouldn't be acting on.
> 
> The recommendation to save all the register values does not mean that
> the values are always valid.

So what does that

"Error handlers should save the values in MCA_ADDR, MCA_MISC0,
and MCA_SYND even if MCA_STATUS[AddrV], MCA_STATUS[MiscV], and
MCA_STATUS[SyndV] are zero."

*actually* mean then?

It is still in the PPR.

-- 
Regards/Gruss,
    Boris.

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