On Wed, Dec 11, 2019 at 01:55:35PM -0500, Wainer dos Santos Moschetta wrote:
> The QEMUMachine VM has a monitor setup on which an QMP
> connection is always attempted on _post_launch() (executed
> by launch()). In case the QEMU process immediatly exits
> then the qmp.accept() (used to establish the connection) stalls
> until it reaches timeout and consequently an exception raises.
> 
> That behavior is undesirable when, for instance, it needs to
> gather information from the QEMU binary ($ qemu -cpu list) or a
> test which launches the VM expecting its failure.
> 
> This patch adds the set_qmp_monitor() method to QEMUMachine that
> allows turn off the creation of the monitor machinery on VM launch.
> 
> Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
> Reviewed-by: Cleber Rosa <crosa@redhat.com>
> ---
>  python/qemu/machine.py | 66 +++++++++++++++++++++++++++---------------
>  1 file changed, 43 insertions(+), 23 deletions(-)
> 
> diff --git a/python/qemu/machine.py b/python/qemu/machine.py
> index a4631d6934..7d4d621a42 100644
> --- a/python/qemu/machine.py
> +++ b/python/qemu/machine.py
> @@ -104,6 +104,7 @@ class QEMUMachine(object):
>          self._events = []
>          self._iolog = None
>          self._socket_scm_helper = socket_scm_helper
> +        self._qmp_set = True   # Enable QMP monitor by default.
>          self._qmp = None
>          self._qemu_full_args = None
>          self._test_dir = test_dir
> @@ -228,15 +229,16 @@ class QEMUMachine(object):
>                  self._iolog = iolog.read()
>  
>      def _base_args(self):
> -        if isinstance(self._monitor_address, tuple):
> -            moncdev = "socket,id=mon,host=%s,port=%s" % (
> +        args = ['-display', 'none', '-vga', 'none']
> +        if self._qmp_set:
> +            if isinstance(self._monitor_address, tuple):
> +                moncdev = "socket,id=mon,host=%s,port=%s" % (
>                  self._monitor_address[0],
>                  self._monitor_address[1])

One thing I missed in my review on v1 was this now became badly
indented.  No worries, it's a minor issue that I can fix on my side
when queueing this patch.

- Cleber.