[PATCH 09/17] migration/multifd: Use the new TLS upgrade API for multifd channels

[Avihai Horon <avihaih@nvidia.com>]

Use the new TLS upgrade API for multifd channels and remove the old TLS
code.

Note that p->c is now set only after a successful TLS connection, so
need to call object_unref() on QIOChannelTLS in case of error in
multifd_tls_outgoing_handshake() (previously it was done in
multifd_save_cleanup()).

Signed-off-by: Avihai Horon <avihaih@nvidia.com>
---
 migration/multifd.c    | 66 ++++++++++--------------------------------
 migration/trace-events |  3 --
 2 files changed, 16 insertions(+), 53 deletions(-)

diff --git a/migration/multifd.c b/migration/multifd.c
index f0c216f4f9..f4d8cd0023 100644
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -794,22 +794,17 @@ static bool multifd_channel_connect(MultiFDSendParams *p,
                                     QIOChannel *ioc,
                                     Error **errp);
 
-static void multifd_tls_outgoing_handshake(QIOTask *task,
-                                           gpointer opaque)
+static void multifd_tls_outgoing_handshake(QIOChannel *ioc, gpointer opaque,
+                                           Error *err)
 {
     MultiFDSendParams *p = opaque;
-    QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task));
-    Error *err = NULL;
 
-    if (!qio_task_propagate_error(task, &err)) {
-        trace_multifd_tls_outgoing_handshake_complete(ioc);
+    if (!err) {
         if (multifd_channel_connect(p, ioc, &err)) {
             return;
         }
     }
 
-    trace_multifd_tls_outgoing_handshake_error(ioc, error_get_pretty(err));
-
     migrate_set_error(migrate_get_current(), err);
     /*
      * Error happen, mark multifd_send_thread status as 'quit' although it
@@ -820,59 +815,30 @@ static void multifd_tls_outgoing_handshake(QIOTask *task,
     qemu_sem_post(&p->sem_sync);
     qemu_sem_post(&p->create_sem);
     error_free(err);
-}
-
-static void *multifd_tls_handshake_thread(void *opaque)
-{
-    MultiFDSendParams *p = opaque;
-    QIOChannelTLS *tioc = QIO_CHANNEL_TLS(p->c);
-
-    qio_channel_tls_handshake(tioc,
-                              multifd_tls_outgoing_handshake,
-                              p,
-                              NULL,
-                              NULL);
-    return NULL;
-}
-
-static bool multifd_tls_channel_connect(MultiFDSendParams *p,
-                                        QIOChannel *ioc,
-                                        Error **errp)
-{
-    MigrationState *s = migrate_get_current();
-    const char *hostname = s->hostname;
-    QIOChannelTLS *tioc;
-
-    tioc = migration_tls_client_create(ioc, hostname, errp);
-    if (!tioc) {
-        return false;
-    }
-
     object_unref(OBJECT(ioc));
-    trace_multifd_tls_outgoing_handshake_start(ioc, tioc, hostname);
-    qio_channel_set_name(QIO_CHANNEL(tioc), "multifd-tls-outgoing");
-    p->c = QIO_CHANNEL(tioc);
-    qemu_thread_create(&p->thread, "multifd-tls-handshake-worker",
-                       multifd_tls_handshake_thread, p,
-                       QEMU_THREAD_JOINABLE);
-    return true;
 }
 
 static bool multifd_channel_connect(MultiFDSendParams *p,
                                     QIOChannel *ioc,
                                     Error **errp)
 {
-    trace_multifd_set_outgoing_channel(
-        ioc, object_get_typename(OBJECT(ioc)),
-        migrate_get_current()->hostname);
+    MigrationState *s = migrate_get_current();
+
+    trace_multifd_set_outgoing_channel(ioc, object_get_typename(OBJECT(ioc)),
+                                       s->hostname);
 
     if (migrate_channel_requires_tls_upgrade(ioc)) {
         /*
-         * tls_channel_connect will call back to this
-         * function after the TLS handshake,
-         * so we mustn't call multifd_send_thread until then
+         * multifd_tls_outgoing_handshake will call back to this function after
+         * the TLS handshake, so we mustn't call multifd_send_thread until then.
          */
-        return multifd_tls_channel_connect(p, ioc, errp);
+        if (migration_tls_channel_connect(ioc, p->name, s->hostname,
+                                          multifd_tls_outgoing_handshake, p,
+                                          true, errp)) {
+            object_unref(OBJECT(ioc));
+            return true;
+        }
+        return false;
     }
 
     qio_channel_set_delay(ioc, false);
diff --git a/migration/trace-events b/migration/trace-events
index 80c3c20faa..2c328326e8 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -144,9 +144,6 @@ multifd_send_sync_main_wait(uint8_t id) "channel %u"
 multifd_send_terminate_threads(bool error) "error %d"
 multifd_send_thread_end(uint8_t id, uint64_t packets, uint64_t normal_pages) "channel %u packets %" PRIu64 " normal pages %"  PRIu64
 multifd_send_thread_start(uint8_t id) "%u"
-multifd_tls_outgoing_handshake_start(void *ioc, void *tioc, const char *hostname) "ioc=%p tioc=%p hostname=%s"
-multifd_tls_outgoing_handshake_error(void *ioc, const char *err) "ioc=%p err=%s"
-multifd_tls_outgoing_handshake_complete(void *ioc) "ioc=%p"
 multifd_set_outgoing_channel(void *ioc, const char *ioctype, const char *hostname)  "ioc=%p ioctype=%s hostname=%s"
 
 # migration.c
-- 
2.26.3