Re: [Qemu-devel] [RFC] icount: warp in the main_loop.

[Frederic Konrad <fred.konrad@greensocs.com>]

On 01/07/2014 18:13, fred.konrad@greensocs.com wrote:
> From: KONRAD Frederic <fred.konrad@greensocs.com>
>
> This fixes a bug where QEMU stall in icount mode.
>
> It happens when a simple timer callback is created on VIRTUAL CLOCK modding
> itself regularly.
>
> The actual warping mechanism is called once and then the time didn't grow
> anymore.
>
> Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
> ---
>   main-loop.c | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/main-loop.c b/main-loop.c
> index 8a85493..ef889b0 100644
> --- a/main-loop.c
> +++ b/main-loop.c
> @@ -489,6 +489,12 @@ int main_loop_wait(int nonblocking)
>   
>       qemu_clock_run_all_timers();
>   
> +    /*
> +     * In icount mode, sometimes the VCPU is blocked and an event is needed to
> +     * continue.
> +     * Just warp to make the time grows and have a chance to run the CPU.
> +     */
> +    qemu_clock_warp(QEMU_CLOCK_VIRTUAL);
>       return ret;
>   }
>   
Paolo,
You mentioned some icount patches (I can't find where) can you point me 
to them?
Did you already had this bug?

Thanks,
Fred