tests: Add migration switchover ack capability test

Add migration switchover ack capability test. The test runs without
devices that support this capability, but is still useful to make sure
it didn't break anything.

Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Tested-by: YangHang Liu <yanghliu@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>

tests/qtest/migration-test.c

@@ -1693,6 +1693,33 @@ static void test_precopy_tcp_plain(void)
     test_precopy_common(&args);
 }
 
+static void *test_migrate_switchover_ack_start(QTestState *from, QTestState *to)
+{
+
+    migrate_set_capability(from, "return-path", true);
+    migrate_set_capability(to, "return-path", true);
+
+    migrate_set_capability(from, "switchover-ack", true);
+    migrate_set_capability(to, "switchover-ack", true);
+
+    return NULL;
+}
+
+static void test_precopy_tcp_switchover_ack(void)
+{
+    MigrateCommon args = {
+        .listen_uri = "tcp:127.0.0.1:0",
+        .start_hook = test_migrate_switchover_ack_start,
+        /*
+         * Source VM must be running in order to consider the switchover ACK
+         * when deciding to do switchover or not.
+         */
+        .live = true,
+    };
+
+    test_precopy_common(&args);
+}
+
 #ifdef CONFIG_GNUTLS
 static void test_precopy_tcp_tls_psk_match(void)
 {
@@ -2737,6 +2764,10 @@ int main(int argc, char **argv)
 #endif /* CONFIG_GNUTLS */
 
     qtest_add_func("/migration/precopy/tcp/plain", test_precopy_tcp_plain);
+
+    qtest_add_func("/migration/precopy/tcp/plain/switchover-ack",
+                   test_precopy_tcp_switchover_ack);
+
 #ifdef CONFIG_GNUTLS
     qtest_add_func("/migration/precopy/tcp/tls/psk/match",
                    test_precopy_tcp_tls_psk_match);