chardev: add hmp hotplug commands

Add chardev-add and chardev-remove commands to the human monitor.
chardev-add accepts the same syntax as -chardev, chardev-remove
expects a chardev id.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hmp-commands.hx

@@ -1482,6 +1482,38 @@ Password is invalidated at the given time.  @var{nsec} are the seconds
 passed since 1970, i.e. unix epoch.
 
 @end table
+ETEXI
+
+    {
+        .name       = "chardev-add",
+        .args_type  = "args:s",
+        .params     = "args",
+        .help       = "add chardev",
+        .mhandler.cmd = hmp_chardev_add,
+    },
+
+STEXI
+@item chardev_add args
+@findex chardev_add
+
+chardev_add accepts the same parameters as the -chardev command line switch.
+
+ETEXI
+
+    {
+        .name       = "chardev-remove",
+        .args_type  = "id:s",
+        .params     = "id",
+        .help       = "remove chardev",
+        .mhandler.cmd = hmp_chardev_remove,
+    },
+
+STEXI
+@item chardev_remove id
+@findex chardev_remove
+
+Removes the chardev @var{id}.
+
 ETEXI
 
     {

hmp.c

@@ -1336,3 +1336,26 @@ void hmp_nbd_server_stop(Monitor *mon, const QDict *qdict)
     qmp_nbd_server_stop(&errp);
     hmp_handle_error(mon, &errp);
 }
+
+void hmp_chardev_add(Monitor *mon, const QDict *qdict)
+{
+    const char *args = qdict_get_str(qdict, "args");
+    Error *err = NULL;
+    QemuOpts *opts;
+
+    opts = qemu_opts_parse(qemu_find_opts("chardev"), args, 1);
+    if (opts == NULL) {
+        error_setg(&err, "Parsing chardev args failed\n");
+    } else {
+        qemu_chr_new_from_opts(opts, NULL, &err);
+    }
+    hmp_handle_error(mon, &err);
+}
+
+void hmp_chardev_remove(Monitor *mon, const QDict *qdict)
+{
+    Error *local_err = NULL;
+
+    qmp_chardev_remove(qdict_get_str(qdict, "id"), &local_err);
+    hmp_handle_error(mon, &local_err);
+}

hmp.h

@@ -80,5 +80,7 @@ void hmp_screen_dump(Monitor *mon, const QDict *qdict);
 void hmp_nbd_server_start(Monitor *mon, const QDict *qdict);
 void hmp_nbd_server_add(Monitor *mon, const QDict *qdict);
 void hmp_nbd_server_stop(Monitor *mon, const QDict *qdict);
+void hmp_chardev_add(Monitor *mon, const QDict *qdict);
+void hmp_chardev_remove(Monitor *mon, const QDict *qdict);
 
 #endif