linux-kernel - Re: [Xen-devel] [PATCH 1/2] xen/mce: Add mcelog support for Xen platform

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Message-ID: <20120531185444.GA7557@phenom.dumpdata.com>
Date:	Thu, 31 May 2012 14:54:44 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	"Liu, Jinsong" <jinsong.liu@...el.com>
Cc:	"Luck, Tony" <tony.luck@...el.com>,
	"'xen-devel@...ts.xensource.com'" <xen-devel@...ts.xensource.com>,
	Borislav Petkov <bp@...64.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 1/2] xen/mce: Add mcelog support for Xen
 platform

> >> That's vMCE injection logic.
> > 
> > Are you sure about it? The comments in it speak of piggybacking on
> > the native MCE handling routines. But since that is not used anymore
> > do you need to use a different mechanism?
> 
> What is not used anymore? what's your concern about cvt_gate_to_trap? I really confused here.
> Could you elaborate more?

Well, the mce.c is not involved anymore. So if it we are piggybacking
on the native MCE handling routines - those routines (do_machine_check)
won't deliever the data to your driver anymore? B/c the do_machine_check
is doing mce_log which spools data. But your driver is using a different
system to de-spool the data - and it does not use the mcelog structure
array.

.. snip.
> >> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >> c/s a01ee165a132fadb57659d26246e340d6ac53265
> > 
> > Which I think the tree is based on too.
> 
> So it would not be stuck?

I've no idea what you mean here. Could you elaborate please?
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