Re: [Qemu-devel] [PATCH] monitor: Check whether TCG is enabled before running the "info jit" code

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Thomas Huth (thuth@redhat.com) wrote:
> The "info jit" command currently aborts on Mac OS X with the message
> "qemu_mutex_lock: Invalid argument" when running with "-M accel=qtest".
> We should only call into the TCG code here if TCG has really been
> enabled and initialized.
> 
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
>  monitor.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/monitor.c b/monitor.c
> index be282ec..3e0979d 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -1086,6 +1086,11 @@ static void hmp_info_registers(Monitor *mon, const QDict *qdict)
>  
>  static void hmp_info_jit(Monitor *mon, const QDict *qdict)
>  {
> +    if (!tcg_enabled()) {
> +        error_report("JIT information is only available with accel=tcg");
> +        return;
> +    }
> +
>      dump_exec_info((FILE *)mon, monitor_fprintf);
>      dump_drift_info((FILE *)mon, monitor_fprintf);
>  }

so tcg_enabled checks tcg_ctx.code_gen_buffer != NULL
code_gen_buffer is set by code_gen_alloc
code_gen_alloc does a qemu_mutex_init of tb_lock
and the previous problem was an uninitialised tb_lock.

So:
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>


Peter: Does this fix the hmp test for you?

Dave

> -- 
> 1.8.3.1
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK