[Qemu-devel] [PATCH] watchdog: Allow setting action on the fly

[Michal Privoznik <mprivozn@redhat.com>]

Currently, the only time that users can set watchdog action is at
the start as all we expose is this -watchdog-action command line
argument. This is suboptimal when users want to plug the device
later via monitor. Alternatively, they might want to change the
action for already existing device on the fly.

Inspired by: https://bugzilla.redhat.com/show_bug.cgi?id=1447169

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
---
 hw/watchdog/watchdog.c | 9 +++++++++
 qapi-schema.json       | 9 +++++++++
 2 files changed, 18 insertions(+)

diff --git a/hw/watchdog/watchdog.c b/hw/watchdog/watchdog.c
index 0c5c9cde1c..971f05c61a 100644
--- a/hw/watchdog/watchdog.c
+++ b/hw/watchdog/watchdog.c
@@ -29,6 +29,8 @@
 #include "qapi-event.h"
 #include "hw/nmi.h"
 #include "qemu/help_option.h"
+#include "qmp-commands.h"
+#include "qapi/qmp/qerror.h"
 
 static int watchdog_action = WDT_RESET;
 static QLIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list;
@@ -147,3 +149,10 @@ void watchdog_perform_action(void)
         break;
     }
 }
+
+void qmp_watchdog_set_action(const char *action, Error **errp)
+{
+    if (select_watchdog_action(action) == -1) {
+        error_setg(errp, QERR_INVALID_PARAMETER, action);
+    }
+}
diff --git a/qapi-schema.json b/qapi-schema.json
index 802ea53d00..be81ffc0bb 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -6539,3 +6539,12 @@
 # Since 2.9
 ##
 { 'command': 'query-vm-generation-id', 'returns': 'GuidInfo' }
+
+##
+# @watchdog-set-action:
+#
+# Set watchdog action
+#
+# Since 2.11
+##
+{ 'command': 'watchdog-set-action', 'data' : {'action': 'str'} }
-- 
2.13.5