Re: [Qemu-devel] time inside qemu

[Màrius Montón]

Hi,

As I understand, OSes running inside qemu "have" notion of time: (its date and time works, time(1) command works, etc.).
My question is about how qemu manages time. I need to stop and start again this "virtual-time".

I just tried with cpu_disable_ticks() and cpu_enable_ticks(). It seems to work partially: at least now system date and time are out of sync..

Màrius

Paul Brook wrote:

On Friday 29 December 2006 16:22, Màrius Montón wrote:
  

Hi,

For my work on QEMU-SC, I need to stop time inside qemu.
I need it in order to simulate HW modules with SystemC simulator, and
meanwhile stop qemu time.
In this way, applications running on qem should see its time freeze, and
measurements of total time spent by application + specific HW be more
realistic (now, total time is the sum of SW + HW simulation )
    

qemu is not cycle accurate or even deterministic.

Fabrice was working on some code to make it deterministic, but he never posted 
the code.

Paul

  

--

Màrius Montón i Macián   address@hidden   http://cephis.uab.es Hardware Engineer CEPHIS Centre de Prototips i Solucions Hardware-Software Dep. Microelectrònica i Sistemes Electrònics ETSE - Universitat Autònoma de Barcelona (UAB)

Phone: +34 935 813 534 Fax: +34 935 813 033 QC-2090D. ETSE. Campus UAB. 080193 Bellaterra

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