linux-kernel - Re: [PATCH -tip 0/6 V4] tracing: kprobe-based event tracer

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Message-ID: <49D61D85.7030609@redhat.com>
Date:	Fri, 03 Apr 2009 17:30:29 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
CC:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Jim Keniston <jkenisto@...ibm.com>, kvm@...r.kernel.org,
	systemtap-ml <systemtap@...rces.redhat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Vegard Nossum <vegard.nossum@...il.com>
Subject: Re: [PATCH -tip 0/6 V4] tracing: kprobe-based event tracer

Masami Hiramatsu wrote:
> Hmm, I'd like to know actually kvm aims to emulate all kinds of
> instructions. 

We're less interested in fpu/sse.  The interesting instructions are 
those used for page table management, mmio, and real mode execution.

> If so, I might find some bugs in x86_emulate.c.
> However, I don't know all bugs. To find all of them, we have to
> port x86_emulate.c to user-space, decode binaries with it, and
> compare its output with another decoder, as Jim had done with insn.c.
>
>   

That would be very useful.


-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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