linux-kernel - Re: [PATCH] ACPI, APEI, Add APEI

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Message-ID: <20110613145012.GA1924@redhat.com>
Date:	Mon, 13 Jun 2011 10:50:12 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>,
	Tony Luck <tony.luck@...el.com>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH] ACPI, APEI, Add APEI _OSC support

On Wed, May 25, 2011 at 02:05:38PM +0800, Huang Ying wrote:
> In APEI firmware first mode, hardware error is reported by hardware to
> firmware firstly, then firmware reports the error to Linux in a GHES
> error record via POLL/SCI/IRQ/NMI etc.
> 
> This may result in some issues if OS has no full APEI support.  So
> some firmware implementation will work in a back-compatible mode by
> default.  Where firmware will only notify OS in old-fashion, without
> GHES record.  For example, for a fatal hardware error, only NMI is
> signaled, no GHES record.
> 
> To gain full APEI power on these machines, a special APEI _OSC needs
> to be evaluated to tell firmware that Linux has full APEI support.
> This patch add the APEI _OSC support.

Using an Intel box I have over at RedHat, I was able to use this patch to
get error injection (EINJ) to provide me a GHES record.  Prior to this 
patch I would just get unknown NMIs.

Talking with Matthew Garret, I guess it seems that uuids like this are
typical for ACPI.

I can't speak for all the ACPI parts, but the patch looks simple and
corret from my perspective.

Reviewed-and-Tested-by: Don Zickus <dzickus@...hat.com>
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