tests/qtest/migration: Add multifd_tcp_plain test using list of chann…

…els instead of uri

Add a positive test to check multifd live migration but this time
using list of channels (restricted to 1) as the starting point
instead of simple uri string.

Signed-off-by: Het Gala <het.gala@nutanix.com>
Suggested-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240312202634.63349-8-het.gala@nutanix.com
Signed-off-by: Peter Xu <peterx@redhat.com>

tests/qtest/migration-test.c

@@ -655,6 +655,13 @@ typedef struct {
      */
     const char *connect_uri;
 
+    /*
+     * Optional: JSON-formatted list of src QEMU URIs. If a port is
+     * defined as '0' in any QDict key a value of '0' will be
+     * automatically converted to the correct destination port.
+     */
+    const char *connect_channels;
+
     /* Optional: callback to run at start to set migration parameters */
     TestMigrateStartHook start_hook;
     /* Optional: callback to run at finish to cleanup */
@@ -1721,7 +1728,7 @@ static void test_precopy_common(MigrateCommon *args)
         goto finish;
     }
 
-    migrate_qmp(from, to, args->connect_uri, NULL, "{}");
+    migrate_qmp(from, to, args->connect_uri, args->connect_channels, "{}");
 
     if (args->result != MIG_TEST_SUCCEED) {
         bool allow_active = args->result == MIG_TEST_FAIL;
@@ -2721,7 +2728,7 @@ test_migrate_precopy_tcp_multifd_zstd_start(QTestState *from,
 }
 #endif /* CONFIG_ZSTD */
 
-static void test_multifd_tcp_none(void)
+static void test_multifd_tcp_uri_none(void)
 {
     MigrateCommon args = {
         .listen_uri = "defer",
@@ -2766,6 +2773,21 @@ static void test_multifd_tcp_no_zero_page(void)
     test_precopy_common(&args);
 }
 
+static void test_multifd_tcp_channels_none(void)
+{
+    MigrateCommon args = {
+        .listen_uri = "defer",
+        .start_hook = test_migrate_precopy_tcp_multifd_start,
+        .live = true,
+        .connect_channels = "[ { 'channel-type': 'main',"
+                            "    'addr': { 'transport': 'socket',"
+                            "              'type': 'inet',"
+                            "              'host': '127.0.0.1',"
+                            "              'port': '0' } } ]",
+    };
+    test_precopy_common(&args);
+}
+
 static void test_multifd_tcp_zlib(void)
 {
     MigrateCommon args = {
@@ -3669,8 +3691,10 @@ int main(int argc, char **argv)
                                test_migrate_dirty_limit);
         }
     }
-    migration_test_add("/migration/multifd/tcp/plain/none",
-                       test_multifd_tcp_none);
+    migration_test_add("/migration/multifd/tcp/uri/plain/none",
+                       test_multifd_tcp_uri_none);
+    migration_test_add("/migration/multifd/tcp/channels/plain/none",
+                       test_multifd_tcp_channels_none);
     migration_test_add("/migration/multifd/tcp/plain/zero-page/legacy",
                        test_multifd_tcp_zero_page_legacy);
     migration_test_add("/migration/multifd/tcp/plain/zero-page/none",