tests/qtest: Unify the test for the xenfv and xenpv machines

We have the same check in three places. Let's unify it in a central
place instead.

Message-Id: <20200622104339.21000-1-thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/qtest/device-introspect-test.c

@@ -287,11 +287,6 @@ static void add_machine_test_case(const char *mname)
 {
     char *path, *args;
 
-    /* Ignore blacklisted machines */
-    if (!memcmp("xenfv", mname, 5) || g_str_equal("xenpv", mname)) {
-        return;
-    }
-
     path = g_strdup_printf("device/introspect/concrete/defaults/%s", mname);
     args = g_strdup_printf("-M %s", mname);
     qtest_add_data_func(path, args, test_device_intro_concrete);

tests/qtest/libqtest.c

@@ -1232,6 +1232,10 @@ void qtest_cb_for_every_machine(void (*cb)(const char *machine),
         qstr = qobject_to(QString, qobj);
         g_assert(qstr);
         mname = qstring_get_str(qstr);
+        /* Ignore machines that cannot be used for qtests */
+        if (!memcmp("xenfv", mname, 5) || g_str_equal("xenpv", mname)) {
+            continue;
+        }
         if (!skip_old_versioned || !qtest_is_old_versioned_machine(mname)) {
             cb(mname);
         }

tests/qtest/qom-test.c

@@ -81,11 +81,6 @@ static void add_machine_test_case(const char *mname)
 {
     char *path;
 
-    /* Ignore blacklisted machines that have known problems */
-    if (!memcmp("xenfv", mname, 5) || g_str_equal("xenpv", mname)) {
-        return;
-    }
-
     path = g_strdup_printf("qom/%s", mname);
     qtest_add_data_func(path, g_strdup(mname), test_machine);
     g_free(path);

tests/qtest/test-hmp.c

@@ -143,11 +143,6 @@ static void add_machine_test_case(const char *mname)
 {
     char *path;
 
-    /* Ignore blacklisted machines that have known problems */
-    if (!memcmp("xenfv", mname, 5) || g_str_equal("xenpv", mname)) {
-        return;
-    }
-
     path = g_strdup_printf("hmp/%s", mname);
     qtest_add_data_func(path, g_strdup(mname), test_machine);
     g_free(path);