linux-kernel - Re: [RFC 5/6] x86, NMI, Add support to notify hardware error with unknown NMI

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Message-ID: <20100913193655.GF26290@redhat.com>
Date:	Mon, 13 Sep 2010 15:36:55 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Huang Ying <ying.huang@...el.com>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 5/6] x86, NMI, Add support to notify hardware error with
 unknown NMI

On Mon, Sep 13, 2010 at 08:36:54PM +0200, Andi Kleen wrote:
> 
> > > 
> > > But if it's generic if not on the screen it should
> > > be at least in the error serialization data and logged after boot.
> > 
> > I guess I don't know what that is, 'error serialization data'.  Is
> > there somewhere I can read more about it?
> 
> That's already supported in MCE -- saving the error record to NVRAM
> and logging it after reboot. NMI should probably do the same.
> It's much nicer than getting it from a console.

Hmm, that assumes these boxes have NVRAM.  I am not sure if many of the
boxes I see with problems have NVRAM on them.

> 
> > > 
> > > At least on PCI-E it may be enough to simply dump all recent AER
> > > data.
> > 
> > This assumes AER is supported on the bridge?  Which for newer chips is
> > probably true, but I wasn't sure about older ones.
> 
> Today's servers should usually have AER at least.
> 
> For old systems you only can get the few bits in PCI space.
> 
> > How would I dump AER data from within the kernel?
> 
> Would need a buffer that is dumped for past events and 
> reading the registers for not yet reported. Right now some
> infrastructure is needed.

Oh ok.

Cheers,
Don
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