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-rw-r--r--tests/qtest/migration-helpers.c26
-rw-r--r--tests/qtest/migration-helpers.h2
2 files changed, 28 insertions, 0 deletions
diff --git a/tests/qtest/migration-helpers.c b/tests/qtest/migration-helpers.c
index 0c185db450..13449c1fe1 100644
--- a/tests/qtest/migration-helpers.c
+++ b/tests/qtest/migration-helpers.c
@@ -240,3 +240,29 @@ void wait_for_migration_fail(QTestState *from, bool allow_active)
     g_assert(qdict_get_bool(rsp_return, "running"));
     qobject_unref(rsp_return);
 }
+
+char *find_common_machine_version(const char *mtype, const char *var1,
+                                  const char *var2)
+{
+    g_autofree char *type1 = qtest_resolve_machine_alias(var1, mtype);
+    g_autofree char *type2 = qtest_resolve_machine_alias(var2, mtype);
+
+    g_assert(type1 && type2);
+
+    if (g_str_equal(type1, type2)) {
+        /* either can be used */
+        return g_strdup(type1);
+    }
+
+    if (qtest_has_machine_with_env(var2, type1)) {
+        return g_strdup(type1);
+    }
+
+    if (qtest_has_machine_with_env(var1, type2)) {
+        return g_strdup(type2);
+    }
+
+    g_test_message("No common machine version for machine type '%s' between "
+                   "binaries %s and %s", mtype, getenv(var1), getenv(var2));
+    g_assert_not_reached();
+}
diff --git a/tests/qtest/migration-helpers.h b/tests/qtest/migration-helpers.h
index 4f51d0f8bc..d1c2351d33 100644
--- a/tests/qtest/migration-helpers.h
+++ b/tests/qtest/migration-helpers.h
@@ -43,4 +43,6 @@ void wait_for_migration_complete(QTestState *who);
 
 void wait_for_migration_fail(QTestState *from, bool allow_active);
 
+char *find_common_machine_version(const char *mtype, const char *var1,
+                                  const char *var2);
 #endif /* MIGRATION_HELPERS_H */