libqos/qgraph: add qos_node_create_driver_named()

So far the qos subsystem of the qtest framework had the limitation
that only one instance of the same official QEMU (QMP) driver name
could be created for qtests. That's because a) the created qos
node names must always be unique, b) the node name must match the
official QEMU driver name being instantiated and c) all nodes are
in a global space shared by all tests.

This patch removes this limitation by introducing a new function
qos_node_create_driver_named() which allows test case authors to
specify a node name being different from the actual associated
QEMU driver name. It fills the new 'qemu_name' field of
QOSGraphNode for that purpose.

Adjust build_driver_cmd_line() and qos_graph_node_set_availability()
to correctly deal with either accessing node name vs. node's
qemu_name correctly.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Message-Id: <3be962ff38f3396f8040deaa5ffdab525c4e0b16.1611704181.git.qemu_oss@crudebyte.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/qtest/libqos/qgraph.h b/tests/qtest/libqos/qgraph.h
index 5f63d352ca..f472949f68 100644
--- a/tests/qtest/libqos/qgraph.h
+++ b/tests/qtest/libqos/qgraph.h
@@ -453,6 +453,22 @@ void qos_node_create_machine_args(const char *name,
 void qos_node_create_driver(const char *name, QOSCreateDriverFunc function);
 
 /**
+ * Behaves as qos_node_create_driver() with the extension of allowing to
+ * specify a different node name vs. associated QEMU device name.
+ *
+ * Use this function instead of qos_node_create_driver() if you need to create
+ * several instances of the same QEMU device. You are free to choose a custom
+ * node name, however the chosen node name must always be unique.
+ *
+ * @param name: custom, unique name of the node to be created
+ * @param qemu_name: actual (official) QEMU driver name the node shall be
+ *                   associated with
+ * @param function: driver constructor
+ */
+void qos_node_create_driver_named(const char *name, const char *qemu_name,
+                                  QOSCreateDriverFunc function);
+
+/**
  * qos_node_contains(): creates one or more edges of type QEDGE_CONTAINS
  * and adds them to the edge list mapped to @container in the
  * edge hash table.