[PATCH 2/6] tests/qtest: Add qtest_probe_accel() method

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Introduce the qtest_probe_accel() method which allows
to query at runtime if a QEMU instance has an accelerator
built-in.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 tests/qtest/libqos/libqtest.h |  9 +++++++++
 tests/qtest/libqtest.c        | 24 ++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/tests/qtest/libqos/libqtest.h b/tests/qtest/libqos/libqtest.h
index a68dcd79d44..ebedb82ec98 100644
--- a/tests/qtest/libqos/libqtest.h
+++ b/tests/qtest/libqos/libqtest.h
@@ -763,6 +763,15 @@ void qmp_expect_error_and_unref(QDict *rsp, const char *class);
  */
 bool qtest_probe_child(QTestState *s);
 
+/**
+ * qtest_probe_accel:
+ * @s: QTestState instance to operate on.
+ * @name: Accelerator name to check for.
+ *
+ * Returns: true if the accelerator is built in.
+ */
+bool qtest_probe_accel(QTestState *s, const char *name);
+
 /**
  * qtest_set_expected_status:
  * @s: QTestState instance to operate on.
diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
index 71e359efcd3..57e7e55b9cc 100644
--- a/tests/qtest/libqtest.c
+++ b/tests/qtest/libqtest.c
@@ -872,6 +872,30 @@ void qtest_qmp_eventwait(QTestState *s, const char *event)
     qobject_unref(response);
 }
 
+bool qtest_probe_accel(QTestState *s, const char *name)
+{
+    bool has_accel = false;
+    QDict *response;
+    QList *accels;
+    QListEntry *accel;
+
+    response = qtest_qmp(s, "{'execute': 'query-accels'}");
+    accels = qdict_get_qlist(response, "return");
+
+    QLIST_FOREACH_ENTRY(accels, accel) {
+        QDict *accel_dict = qobject_to(QDict, qlist_entry_obj(accel));
+        const char *accel_name = qdict_get_str(accel_dict, "name");
+
+        if (!strcmp(name, accel_name)) {
+            has_accel = true;
+            break;
+        }
+    }
+    qobject_unref(response);
+
+    return has_accel;
+}
+
 char *qtest_vhmp(QTestState *s, const char *fmt, va_list ap)
 {
     char *cmd;
-- 
2.26.2