[PATCH 14/19] python/qemu/machine: Allow to use other serial consoles than default

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

Currently we are limited to use the first serial console available.
Some machines/guest might use another console than the first one as
the 'boot console'.

To be able to use the N console as default, we simply need to connect
all the N - 1 consoles to the null chardev.

Add an index argument, so we can use a specific serial console as
default.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 python/qemu/machine.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/python/qemu/machine.py b/python/qemu/machine.py
index 128a3d1dc2..302b158a18 100644
--- a/python/qemu/machine.py
+++ b/python/qemu/machine.py
@@ -235,6 +235,8 @@ class QEMUMachine(object):
                 '-display', 'none', '-vga', 'none']
         if self._machine is not None:
             args.extend(['-machine', self._machine])
+        for i in range(self._console_id):
+            args.extend(['-serial', 'null'])
         if self._console_set:
             self._console_address = os.path.join(self._temp_dir,
                                                  self._name + "-console.sock")
@@ -495,7 +497,7 @@ class QEMUMachine(object):
         """
         self._machine = machine_type
 
-    def set_console(self, device_type=None):
+    def set_console(self, device_type=None, console_id=0):
         """
         Sets the device type for a console device
 
@@ -519,6 +521,7 @@ class QEMUMachine(object):
         """
         self._console_set = True
         self._console_device_type = device_type
+        self._console_id = console_id
 
     @property
     def console_socket(self):
-- 
2.20.1