linux-kernel - Re: mmiotrace bug: recursive probe hit

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Message-ID: <84144f020804050040r6fd8b9a8h6d344b4ea53cb3e5@mail.gmail.com>
Date:	Sat, 5 Apr 2008 10:40:18 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Avi Kivity" <avi@...ranet.com>
Cc:	"Pekka Paalanen" <pq@....fi>, linux-kernel@...r.kernel.org,
	"Ingo Molnar" <mingo@...e.hu>,
	"Christoph Hellwig" <hch@...radead.org>,
	"Arjan van de Ven" <arjan@...radead.org>,
	"Pavel Roskin" <proski@....org>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>, vegard.nossum@...il.com
Subject: Re: mmiotrace bug: recursive probe hit

On Sat, Apr 5, 2008 at 10:36 AM, Avi Kivity <avi@...ranet.com> wrote:
> It should not be too difficult to modify x86_emulate.c to do everything
> through a function vector.  However there is a simpler (for you) solution:
> run the driver-to-be-reverse-engineered in a kvm guest, and modify kvm
> userspace to log accesses to mmio regions.  This requires the not-yet-merged
> pci passthrough support.  You can reverse engineer Windows drivers with this
> as well.
>
>  This won't work for kmemcheck smp though.

For kmemcheck, I'd prefer the per-CPU page tables suggested by Ingo.
I'm having hard time understanding why that's a "ugly hack" compared
to using kvm for this...
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