On 06/25/2011 06:26 AM, Mulyadi Santosa wrote:
On Sat, Jun 25, 2011 at 09:34, felix.matenaar@rwth-aachen
<felix.maten...@rwth-aachen.de> wrote:
Hello,
I am currently implementing some heuristics using a patched qemu
(i386-softmmu). Two of them take some time for each vm memory access. If I
run them both, suddenly qemu segfaults while executing a BBL. Using just one
of them never triggers this problem.
"Two" instances of Qemu running at the same time, you mean?
No. What I do is using gen_helper_ to compile hooks into call/ret/jmp
and memory access. The Heuristics can then hook the events so
calculation is done during the execution of a basic block. I thought
that it could be possible that Qemu sets a timeout for BBL execution to
prevent CPU monopolization by e.g. a long sequence of rep. That would
make sense because my heuristics calculation time falls into the BBL
execution time for Qemu. Does anyone know more about that?
Regards,
Felix
