migration/multifd: Remove sync processing on postcopy

Multifd never worked with postcopy, at least yet so far.

Remove the sync processing there, because it's confusing, and they should
never appear.  Now if RAM_SAVE_FLAG_MULTIFD_FLUSH is observed, we fail hard
instead of trying to invoke multifd code.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20241206224755.1108686-6-peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>

diff --git a/migration/ram.c b/migration/ram.c
index ef683d11f044b4f655c3227ad4b2ccf64ed36333..9eeb77665b8c2bbe5a5b1a6b0cbae823da6acf32 100644 (file)
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -3772,15 +3772,7 @@ int ram_load_postcopy(QEMUFile *f, int channel)
                                          TARGET_PAGE_SIZE);
             }
             break;
-        case RAM_SAVE_FLAG_MULTIFD_FLUSH:
-            multifd_recv_sync_main();
-            break;
         case RAM_SAVE_FLAG_EOS:
-            /* normal exit */
-            if (migrate_multifd() &&
-                migrate_multifd_flush_after_each_section()) {
-                multifd_recv_sync_main();
-            }
             break;
         default:
             error_report("Unknown combination of migration flags: 0x%x"