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>

1 files changed, 41 insertions, 0 deletions

diff --git a/softmmu/runstate-action.c b/softmmu/runstate-action.c
new file mode 100644
index 0000000000..44de01adaf
--- /dev/null
+++ b/softmmu/runstate-action.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2020 Oracle and/or its affiliates.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "sysemu/runstate-action.h"
+#include "sysemu/watchdog.h"
+#include "qemu/config-file.h"
+#include "qapi/error.h"
+#include "qemu/option_int.h"
+
+RebootAction reboot_action = REBOOT_ACTION_NONE;
+ShutdownAction shutdown_action = SHUTDOWN_ACTION_POWEROFF;
+
+/*
+ * Receives actions to be applied for specific guest events
+ * and sets the internal state as requested.
+ */
+void qmp_set_action(bool has_reboot, RebootAction reboot,
+                    bool has_shutdown, ShutdownAction shutdown,
+                    bool has_panic, PanicAction panic,
+                    bool has_watchdog, WatchdogAction watchdog,
+                    Error **errp)
+{
+    if (has_reboot) {
+        reboot_action = reboot;
+    }
+
+    if (has_watchdog) {
+        qmp_watchdog_set_action(watchdog, errp);
+    }
+
+    /* Process shutdown last, in case the panic action needs to be altered */
+    if (has_shutdown) {
+        shutdown_action = shutdown;
+    }
+}