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libqos/qgraph: add qos_node_create_driver_named()

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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>
This commit is contained in:
Christian Schoenebeck 2021-01-27 00:00:34 +01:00 • committed by Paolo Bonzini
parent 027b524d6a
commit f6a2c6eee7
3 changed files with 68 additions and 3 deletions
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1
tests/qtest/libqos/qgraph_internal.h
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@ -56,6 +56,7 @@ struct QOSGraphNode {
bool available; /* set by QEMU via QMP, used during graph walk */
bool visited; /* used during graph walk */
char *name; /* used to identify the node */
char *qemu_name; /* optional: see qos_node_create_driver_named() */
char *command_line; /* used to start QEMU at test execution */
union {
struct {