tests: Add postcopy tls migration test

We just added TLS tests for precopy but not postcopy.  Add the
corresponding test for vanilla postcopy.

Rename the vanilla postcopy to "postcopy/plain" because all postcopy tests
will only use unix sockets as channel.

Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20220707185525.27692-1-peterx@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  dgilbert: Manual merge

tests/qtest/migration-test.c

@@ -573,6 +573,9 @@ typedef struct {
 
     /* Optional: set number of migration passes to wait for */
     unsigned int iterations;
+
+    /* Postcopy specific fields */
+    void *postcopy_data;
 } MigrateCommon;
 
 static int test_migrate_start(QTestState **from, QTestState **to,
@@ -1061,15 +1064,19 @@ test_migrate_tls_x509_finish(QTestState *from,
 
 static int migrate_postcopy_prepare(QTestState **from_ptr,
                                     QTestState **to_ptr,
-                                    MigrateStart *args)
+                                    MigrateCommon *args)
 {
     g_autofree char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
     QTestState *from, *to;
 
-    if (test_migrate_start(&from, &to, uri, args)) {
+    if (test_migrate_start(&from, &to, uri, &args->start)) {
         return -1;
     }
 
+    if (args->start_hook) {
+        args->postcopy_data = args->start_hook(from, to);
+    }
+
     migrate_set_capability(from, "postcopy-ram", true);
     migrate_set_capability(to, "postcopy-ram", true);
     migrate_set_capability(to, "postcopy-blocktime", true);
@@ -1089,7 +1096,8 @@ static int migrate_postcopy_prepare(QTestState **from_ptr,
     return 0;
 }
 
-static void migrate_postcopy_complete(QTestState *from, QTestState *to)
+static void migrate_postcopy_complete(QTestState *from, QTestState *to,
+                                      MigrateCommon *args)
 {
     wait_for_migration_complete(from);
 
@@ -1100,25 +1108,50 @@ static void migrate_postcopy_complete(QTestState *from, QTestState *to)
         read_blocktime(to);
     }
 
+    if (args->finish_hook) {
+        args->finish_hook(from, to, args->postcopy_data);
+        args->postcopy_data = NULL;
+    }
+
     test_migrate_end(from, to, true);
 }
 
+static void test_postcopy_common(MigrateCommon *args)
+{
+    QTestState *from, *to;
+
+    if (migrate_postcopy_prepare(&from, &to, args)) {
+        return;
+    }
+    migrate_postcopy_start(from, to);
+    migrate_postcopy_complete(from, to, args);
+}
+
 static void test_postcopy(void)
 {
-    MigrateStart args = {};
+    MigrateCommon args = { };
-    QTestState *from, *to;
 
-    if (migrate_postcopy_prepare(&from, &to, &args)) {
+    test_postcopy_common(&args);
-        return;
-    }
-    migrate_postcopy_start(from, to);
-    migrate_postcopy_complete(from, to);
 }
 
+#ifdef CONFIG_GNUTLS
+static void test_postcopy_tls_psk(void)
+{
+    MigrateCommon args = {
+        .start_hook = test_migrate_tls_psk_start_match,
+        .finish_hook = test_migrate_tls_psk_finish,
+    };
+
+    test_postcopy_common(&args);
+}
+#endif
+
 static void test_postcopy_recovery(void)
 {
-    MigrateStart args = {
+    MigrateCommon args = {
-        .hide_stderr = true,
+        .start = {
+            .hide_stderr = true,
+        },
     };
     QTestState *from, *to;
     g_autofree char *uri = NULL;
@@ -1174,7 +1207,7 @@ static void test_postcopy_recovery(void)
     /* Restore the postcopy bandwidth to unlimited */
     migrate_set_parameter_int(from, "max-postcopy-bandwidth", 0);
 
-    migrate_postcopy_complete(from, to);
+    migrate_postcopy_complete(from, to, &args);
 }
 
 static void test_baddest(void)
@@ -2378,12 +2411,20 @@ int main(int argc, char **argv)
 
     qtest_add_func("/migration/postcopy/unix", test_postcopy);
     qtest_add_func("/migration/postcopy/recovery", test_postcopy_recovery);
+    qtest_add_func("/migration/postcopy/plain", test_postcopy);
+
     qtest_add_func("/migration/bad_dest", test_baddest);
     qtest_add_func("/migration/precopy/unix/plain", test_precopy_unix_plain);
     qtest_add_func("/migration/precopy/unix/xbzrle", test_precopy_unix_xbzrle);
 #ifdef CONFIG_GNUTLS
     qtest_add_func("/migration/precopy/unix/tls/psk",
                    test_precopy_unix_tls_psk);
+    /*
+     * NOTE: psk test is enough for postcopy, as other types of TLS
+     * channels are tested under precopy.  Here what we want to test is the
+     * general postcopy path that has TLS channel enabled.
+     */
+    qtest_add_func("/migration/postcopy/tls/psk", test_postcopy_tls_psk);
 #ifdef CONFIG_TASN1
     qtest_add_func("/migration/precopy/unix/tls/x509/default-host",
                    test_precopy_unix_tls_x509_default_host);