qmp: generalize watchdog-set-action to -no-reboot/-no-shutdown

Add a QMP command to allow for the behaviors specified by the
-no-reboot and -no-shutdown command line option to be set at runtime.
The new command is named set-action and takes optional arguments, named
after an event, that provide a corresponding action to take.

Example:

-> { "execute": "set-action",
     "arguments": {
	"reboot": "none",
	"shutdown": "poweroff",
	"watchdog": "debug" } }
<- { "return": {} }

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Message-Id: <1607705564-26264-4-git-send-email-alejandro.j.jimenez@oracle.com>
[Split the series differently, with -action based on the QMP command. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

qapi/run-state.json

@@ -325,6 +325,34 @@
   'data': [ 'reset', 'shutdown', 'poweroff', 'pause', 'debug', 'none',
             'inject-nmi' ] }
 
+##
+# @RebootAction:
+#
+# Possible QEMU actions upon guest reboot
+#
+# @none: Reset the VM
+#
+# @shutdown: Shutdown the VM and exit
+#
+# Since: 6.0
+##
+{ 'enum': 'RebootAction',
+  'data': [ 'none', 'shutdown' ] }
+
+##
+# @ShutdownAction:
+#
+# Possible QEMU actions upon guest shutdown
+#
+# @poweroff: Shutdown the VM and exit
+#
+# @pause: pause the VM#
+#
+# Since: 6.0
+##
+{ 'enum': 'ShutdownAction',
+  'data': [ 'poweroff', 'pause' ] }
+
 ##
 # @watchdog-set-action:
 #
@@ -334,6 +362,36 @@
 ##
 { 'command': 'watchdog-set-action', 'data' : {'action': 'WatchdogAction'} }
 
+##
+# @set-action:
+#
+# Set the actions that will be taken by the emulator in response to guest
+# events.
+#
+# @reboot: @RebootAction action taken on guest reboot.
+#
+# @shutdown: @ShutdownAction action taken on guest shutdown.
+#
+# @watchdog: @WatchdogAction action taken when watchdog timer expires .
+#
+# Returns: Nothing on success.
+#
+# Since: 6.0
+#
+# Example:
+#
+# -> { "execute": "set-action",
+#      "arguments": { "reboot": "shutdown",
+#                     "shutdown" : "pause",
+#                     "watchdog": "inject-nmi" } }
+# <- { "return": {} }
+##
+{ 'command': 'set-action',
+  'data': { '*reboot': 'RebootAction',
+            '*shutdown': 'ShutdownAction',
+            '*watchdog': 'WatchdogAction' },
+  'allow-preconfig': true }
+
 ##
 # @GUEST_PANICKED:
 #