monitor: add object-del (QMP) and object_del (HMP) command

These two commands invoke the "unparent" method of Object.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

6 files changed, 77 insertions, 0 deletions

diff --git a/hmp-commands.hx b/hmp-commands.hx
index 929550d66b..4d5e2b5142 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1243,6 +1243,20 @@ STEXI
 Remove host network device.
 ETEXI
 
+    {
+        .name       = "object_del",
+        .args_type  = "id:s",
+        .params     = "id",
+        .help       = "destroy QOM object",
+        .mhandler.cmd = hmp_object_del,
+    },
+
+STEXI
+@item object_del
+@findex object_del
+Destroy QOM object.
+ETEXI
+
 #ifdef CONFIG_SLIRP
     {
         .name       = "hostfwd_add",
diff --git a/hmp.c b/hmp.c
index c513f9b685..fe05c6b860 100644
--- a/hmp.c
+++ b/hmp.c
@@ -1574,3 +1574,12 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
 
     hmp_handle_error(mon, &err);
 }
+
+void hmp_object_del(Monitor *mon, const QDict *qdict)
+{
+    const char *id = qdict_get_str(qdict, "id");
+    Error *err = NULL;
+
+    qmp_object_del(id, &err);
+    hmp_handle_error(mon, &err);
+}
diff --git a/hmp.h b/hmp.h
index f92fc8922d..7a11f68a3b 100644
--- a/hmp.h
+++ b/hmp.h
@@ -90,5 +90,6 @@ void hmp_chardev_add(Monitor *mon, const QDict *qdict);
 void hmp_chardev_remove(Monitor *mon, const QDict *qdict);
 void hmp_qemu_io(Monitor *mon, const QDict *qdict);
 void hmp_cpu_add(Monitor *mon, const QDict *qdict);
+void hmp_object_del(Monitor *mon, const QDict *qdict);
 
 #endif
diff --git a/qapi-schema.json b/qapi-schema.json
index c3c939c8c3..af3a83bf0b 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -2759,6 +2759,20 @@
 { 'command': 'netdev_del', 'data': {'id': 'str'} }
 
 ##
+# @object-del:
+#
+# Remove a QOM object.
+#
+# @id: the name of the QOM object to remove
+#
+# Returns: Nothing on success
+#          Error if @id is not a valid id for a QOM object
+#
+# Since: 2.0
+##
+{ 'command': 'object-del', 'data': {'id': 'str'} }
+
+##
 # @NetdevNoneOptions
 #
 # Use it alone to have zero network devices.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index fba15cdc3b..71422cd99c 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -879,6 +879,31 @@ Example:
 EQMP
 
     {
+        .name       = "object-del",
+        .args_type  = "id:s",
+        .mhandler.cmd_new = qmp_marshal_input_object_del,
+    },
+
+SQMP
+object-del
+----------
+
+Remove QOM object.
+
+Arguments:
+
+- "id": the object's ID (json-string)
+
+Example:
+
+-> { "execute": "object-del", "arguments": { "id": "rng1" } }
+<- { "return": {} }
+
+
+EQMP
+
+
+    {
         .name       = "block_resize",
         .args_type  = "device:B,size:o",
         .mhandler.cmd_new = qmp_marshal_input_block_resize,
diff --git a/qmp.c b/qmp.c
index 1d7a04d7a0..73aab5876c 100644
--- a/qmp.c
+++ b/qmp.c
@@ -529,3 +529,17 @@ void qmp_add_client(const char *protocol, const char *fdname,
     error_setg(errp, "protocol '%s' is invalid", protocol);
     close(fd);
 }
+
+void qmp_object_del(const char *id, Error **errp)
+{
+    Object *container;
+    Object *obj;
+
+    container = container_get(object_get_root(), "/objects");
+    obj = object_resolve_path_component(container, id);
+    if (!obj) {
+        error_setg(errp, "object id not found");
+        return;
+    }
+    object_unparent(obj);
+}