Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761644AbZDCQ4U (ORCPT ); Fri, 3 Apr 2009 12:56:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757889AbZDCQ4E (ORCPT ); Fri, 3 Apr 2009 12:56:04 -0400 Received: from mx2.redhat.com ([66.187.237.31]:49234 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754625AbZDCQ4C (ORCPT ); Fri, 3 Apr 2009 12:56:02 -0400 Message-ID: <49D63F70.7040308@redhat.com> Date: Fri, 03 Apr 2009 12:55:12 -0400 From: Masami Hiramatsu User-Agent: Thunderbird 2.0.0.21 (X11/20090320) MIME-Version: 1.0 To: Ingo Molnar , Jim Keniston CC: Avi Kivity , "H. Peter Anvin" , Frederic Weisbecker , Steven Rostedt , Ananth N Mavinakayanahalli , Andrew Morton , Andi Kleen , kvm@vger.kernel.org, systemtap-ml , LKML , Vegard Nossum Subject: Re: [PATCH -tip 0/6 V4] tracing: kprobe-based event tracer References: <49D4F4B5.9040107@redhat.com> <20090403112639.GC31399@elte.hu> <49D5F80B.7000305@redhat.com> <49D61B56.9020408@redhat.com> <20090403142325.GA14932@elte.hu> In-Reply-To: <20090403142325.GA14932@elte.hu> X-Enigmail-Version: 0.95.7 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1460 Lines: 42 Ingo Molnar wrote: > * Masami Hiramatsu wrote: > >> Hmm, I'd like to know actually kvm aims to emulate all kinds of >> instructions. 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. >> >> https://www.redhat.com/archives/utrace-devel/2009-March/msg00031.html > > btw., i'd suggest we put a build time check for this into the kernel > version as well. For example to decode the vmlinux via objdump, run > it through your decoder as well and compare the results. Put under a > CONFIG_DEBUG_X86_DECODER_TEST kind of (deault-off) build-time > self-test. > > This would ensure that the kernel we are running is fully supported > by the decoder - even as GCC/GAS starts using new instructions, etc. > > How does this sound to you? Thanks! That is a good idea. Jim, would you think you can port your script into kernel tree? Thank you, -- Masami Hiramatsu Software Engineer Hitachi Computer Products (America) Inc. Software Solutions Division e-mail: mhiramat@redhat.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/