[PATCH v4 11/23] migration: push Error **errp into loadvm_postcopy_handle_listen()

[Arun Menon <armenon@redhat.com>]

This is an incremental step in converting vmstate loading
code to report error via Error objects instead of directly
printing it to console/monitor.
It is ensured that loadvm_postcopy_handle_listen() must report an error
in errp, in case of failure.

Signed-off-by: Arun Menon <armenon@redhat.com>
---
 migration/savevm.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/migration/savevm.c b/migration/savevm.c
index 24ec721587564fa0432882d86bd5f71161f0aee9..3ed399267af7ebc9746d81920ec58277485206dc 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2173,15 +2173,16 @@ static void *postcopy_ram_listen_thread(void *opaque)
 }
 
 /* After this message we must be able to immediately receive postcopy data */
-static int loadvm_postcopy_handle_listen(MigrationIncomingState *mis)
+static int loadvm_postcopy_handle_listen(MigrationIncomingState *mis,
+                                         Error **errp)
 {
     PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_LISTENING);
-    Error *local_err = NULL;
 
     trace_loadvm_postcopy_handle_listen("enter");
 
     if (ps != POSTCOPY_INCOMING_ADVISE && ps != POSTCOPY_INCOMING_DISCARD) {
-        error_report("CMD_POSTCOPY_LISTEN in wrong postcopy state (%d)", ps);
+        error_setg(errp, "CMD_POSTCOPY_LISTEN in wrong postcopy "
+                   "state (%d)", ps);
         return -1;
     }
     if (ps == POSTCOPY_INCOMING_ADVISE) {
@@ -2204,14 +2205,14 @@ static int loadvm_postcopy_handle_listen(MigrationIncomingState *mis)
     if (migrate_postcopy_ram()) {
         if (postcopy_ram_incoming_setup(mis)) {
             postcopy_ram_incoming_cleanup(mis);
+            error_setg(errp, "Failed to setup incoming postcopy RAM blocks");
             return -1;
         }
     }
 
     trace_loadvm_postcopy_handle_listen("after uffd");
 
-    if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_LISTEN, &local_err)) {
-        error_report_err(local_err);
+    if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_LISTEN, errp)) {
         return -1;
     }
 
@@ -2621,12 +2622,7 @@ static int loadvm_process_command(QEMUFile *f, Error **errp)
         return loadvm_postcopy_handle_advise(mis, len, errp);
 
     case MIG_CMD_POSTCOPY_LISTEN:
-        ret = loadvm_postcopy_handle_listen(mis);
-        if (ret < 0) {
-            error_setg(errp, "Failed to load device state command: %d", ret);
-            return -1;
-        }
-        return ret;
+        return loadvm_postcopy_handle_listen(mis, errp);
 
     case MIG_CMD_POSTCOPY_RUN:
         ret = loadvm_postcopy_handle_run(mis);

-- 
2.50.0