multifd: Make multifd_load_setup() get an Error parameter

We need to change the full chain to pass the Error parameter.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

migration/migration.c

@@ -518,13 +518,23 @@ fail:
     exit(EXIT_FAILURE);
 }
 
-static void migration_incoming_setup(QEMUFile *f)
+/**
+ * @migration_incoming_setup: Setup incoming migration
+ *
+ * Returns 0 for no error or 1 for error
+ *
+ * @f: file for main migration channel
+ * @errp: where to put errors
+ */
+static int migration_incoming_setup(QEMUFile *f, Error **errp)
 {
     MigrationIncomingState *mis = migration_incoming_get_current();
+    Error *local_err = NULL;
 
-    if (multifd_load_setup() != 0) {
+    if (multifd_load_setup(&local_err) != 0) {
         /* We haven't been able to create multifd threads
            nothing better to do */
+        error_report_err(local_err);
         exit(EXIT_FAILURE);
     }
 
@@ -532,6 +542,7 @@ static void migration_incoming_setup(QEMUFile *f)
         mis->from_src_file = f;
     }
     qemu_file_set_blocking(f, false);
+    return 0;
 }
 
 void migration_incoming_process(void)
@@ -572,19 +583,27 @@ static bool postcopy_try_recover(QEMUFile *f)
     return false;
 }
 
-void migration_fd_process_incoming(QEMUFile *f)
+void migration_fd_process_incoming(QEMUFile *f, Error **errp)
 {
+    Error *local_err = NULL;
+
     if (postcopy_try_recover(f)) {
         return;
     }
 
-    migration_incoming_setup(f);
+    if (migration_incoming_setup(f, &local_err)) {
+        if (local_err) {
+            error_propagate(errp, local_err);
+        }
+        return;
+    }
     migration_incoming_process();
 }
 
 void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp)
 {
     MigrationIncomingState *mis = migration_incoming_get_current();
+    Error *local_err = NULL;
     bool start_migration;
 
     if (!mis->from_src_file) {
@@ -596,7 +615,12 @@ void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp)
             return;
         }
 
-        migration_incoming_setup(f);
+        if (migration_incoming_setup(f, &local_err)) {
+            if (local_err) {
+                error_propagate(errp, local_err);
+            }
+            return;
+        }
 
         /*
          * Common migration only needs one channel, so we can start
@@ -604,7 +628,6 @@ void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp)
          */
         start_migration = !migrate_use_multifd();
     } else {
-        Error *local_err = NULL;
         /* Multiple connections */
         assert(migrate_use_multifd());
         start_migration = multifd_recv_new_channel(ioc, &local_err);

migration/migration.h

@@ -265,7 +265,7 @@ struct MigrationState
 
 void migrate_set_state(int *state, int old_state, int new_state);
 
-void migration_fd_process_incoming(QEMUFile *f);
+void migration_fd_process_incoming(QEMUFile *f, Error **errp);
 void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp);
 void migration_incoming_process(void);
 

migration/ram.c

@@ -1474,7 +1474,7 @@ static void *multifd_recv_thread(void *opaque)
     return NULL;
 }
 
-int multifd_load_setup(void)
+int multifd_load_setup(Error **errp)
 {
     int thread_count;
     uint32_t page_count = MULTIFD_PACKET_SIZE / qemu_target_page_size();

migration/ram.h

@@ -43,7 +43,7 @@ uint64_t ram_bytes_total(void);
 
 int multifd_save_setup(Error **errp);
 void multifd_save_cleanup(void);
-int multifd_load_setup(void);
+int multifd_load_setup(Error **errp);
 int multifd_load_cleanup(Error **errp);
 bool multifd_recv_all_channels_created(void);
 bool multifd_recv_new_channel(QIOChannel *ioc, Error **errp);

migration/rdma.c

@@ -4004,7 +4004,7 @@ static void rdma_accept_incoming_migration(void *opaque)
     }
 
     rdma->migration_started_on_destination = 1;
-    migration_fd_process_incoming(f);
+    migration_fd_process_incoming(f, errp);
 }
 
 void rdma_start_incoming_migration(const char *host_port, Error **errp)