lkml.org 
[lkml]   [2009]   [Apr]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH -tip 0/6 V4] tracing: kprobe-based event tracer
Ingo Molnar wrote:
> * Masami Hiramatsu <mhiramat@redhat.com> 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



\
 
 \ /
  Last update: 2009-04-03 18:59    [W:0.054 / U:4.824 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site