[PATCH v2 5/6] migration: Modified 'migrate-incoming' QAPI and HMP side changes on the destination interface.

[Het Gala]

'migrate-incoming' QAPI design have been modified into well-defined
MigrateChannel struct to prevent multiple encoding of uri strings on
the destination side.'uri' parameter is kept for backward compatibility.

Suggested-by: Daniel P. Berrange <berra...@redhat.com>
Suggested-by: Manish Mishra <manish.mis...@nutanix.com>
Suggested-by: Aravind Retnakaran <aravind.retnaka...@nutanix.com>
Signed-off-by: Het Gala <het.g...@nutanix.com>
---
 migration/migration-hmp-cmds.c |  8 +++++++-
 migration/migration.c          |  3 ++-
 qapi/migration.json            | 22 ++++++++++++++++++++--
 softmmu/vl.c                   |  2 +-
 4 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c
index a9f65ded7a..ae3c5ea5b2 100644
--- a/migration/migration-hmp-cmds.c
+++ b/migration/migration-hmp-cmds.c
@@ -500,8 +500,14 @@ void hmp_migrate_incoming(Monitor *mon, const QDict *qdict)
     Error *err = NULL;
     const char *uri = qdict_get_str(qdict, "uri");
 
-    qmp_migrate_incoming(uri, &err);
+    MigrateChannel *channel = g_new0(MigrateChannel, 1);
+    if (!migrate_channel_from_qdict(&channel, qdict, &err)) {
+        error_setg(&err, "error in retrieving channel from qdict");
+        return;
+    }
 
+    qmp_migrate_incoming(uri, channel, &err);
+    qapi_free_MigrateChannel(channel);
     hmp_handle_error(mon, err);
 }
 
diff --git a/migration/migration.c b/migration/migration.c
index accbf72a18..e22ce2dd15 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -2314,7 +2314,8 @@ void migrate_del_blocker(Error *reason)
     migration_blockers = g_slist_remove(migration_blockers, reason);
 }
 
-void qmp_migrate_incoming(const char *uri, Error **errp)
+void qmp_migrate_incoming(const char *uri, MigrateChannel *channel,
+                          Error **errp)
 {
     Error *local_err = NULL;
     static bool once = true;
diff --git a/qapi/migration.json b/qapi/migration.json
index 79acfcfe4e..3a88912f4d 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -1623,7 +1623,11 @@
 # with -incoming defer
 #
 # @uri: The Uniform Resource Identifier identifying the source or
-#       address to listen on
+#       the address to listen on
+#
+# @channel: Struct containing migration channel type, along with
+#           all the details of the destination interface required
+#           for the address to listen on for migration stream.
 #
 # Returns: nothing on success
 #
@@ -1640,14 +1644,28 @@
 #
 # 3. The uri format is the same as for -incoming
 #
+# 4. The 'uri' and 'channel' arguments are mutually exclusive but, atleast
+#    one of the two arguments should be present.
+#
 # Example:
 #
 # -> { "execute": "migrate-incoming",
 #      "arguments": { "uri": "tcp::4446" } }
 # <- { "return": {} }
 #
+# -> { "execute": "migrate-incoming",
+#      "arguments": {
+#          "channel": { "channeltype": "main",
+#                        "addr": { "transport": "socket",
+#                                  "socket-type": { "type": "inet",
+#                                                   "host": "10.12.34.9",
+#                                                   "port": "1050" } } } } }
+# <- { "return": {} }
+#
 ##
-{ 'command': 'migrate-incoming', 'data': {'uri': 'str' } }
+{ 'command': 'migrate-incoming',
+             'data': {'*uri': 'str',
+                      '*channel': 'MigrateChannel'} }
 
 ##
 # @xen-save-devices-state:
diff --git a/softmmu/vl.c b/softmmu/vl.c
index 9177d95d4e..16b8bdcf9b 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -2617,7 +2617,7 @@ void qmp_x_exit_preconfig(Error **errp)
     if (incoming) {
         Error *local_err = NULL;
         if (strcmp(incoming, "defer") != 0) {
-            qmp_migrate_incoming(incoming, &local_err);
+            qmp_migrate_incoming(incoming, NULL, &local_err);
             if (local_err) {
                 error_reportf_err(local_err, "-incoming %s: ", incoming);
                 exit(1);
-- 
2.22.3