Re: [Qemu-devel] Memory Traces for System Simulation

[Luis Useche <luis@cs.fiu.edu>]

Nobody? Please somebody help me. I would really appreciate it.

On Wed, Jun 17, 2009 at 05:50:18PM -0400, Luis Useche wrote:
> Hi Guys,
> 
> I have been trying the last two days to find the correct places in the
> qemu code to trace the memory accesses in the running system. The qemu
> code is somewhat confusing and there are plenty of places that look like
> the correct trace point.
> 
> I know that there exist plenty of threads about this matter in the list
> but non of them solve my problem.
> 
> Some people suggested to use Argos (http://www.few.vu.nl/argos/) to get
> this information. There are two problems with this: (1) There is no clear
> documentation on how to do this in Argos (2) The code seems outdated and
> does not compile in systems with gcc>=4.
> 
> There is also a patch for qemu 0.8 but it does not apply anymore.
> http://www.csl.cornell.edu/~vince/projects/qemu-trace/old/.
> 
> At the moment, I am instrumenting several functions in exec.c as my trace
> points:
> 	ldl_phys
> 	ldq_phys
> 	ldup_phys
> 	lduw_phys
> 	stl_phys_notdirty
> 	stq_phys_notdirty
> 	stl_phys
> 	stb_phys
> 	stw_phys
> 	stq_phys
> 
> I would really appreciate any suggestion you have in order to solve my
> problem. If you have any insights in the solutions I explained above I
> would be very thankful.
> 
> Given that many people seems to be having the same problem than I, it
> would be nice to have an actual framework that add this functionality to
> qemu. I can offer myself to do that as long as I have enough help.
> 
> As a parallel question: Does qemu simulate CPU cache? i.e. There is always
> memory access even when this would not happen in a real system due to CPU
> cache?
> 
> Thanks in advance,

-- 
Luis Useche <luis@cs.fiu.edu>
Ph.D. Student
Florida International University