diff --git a/include/migration/colo.h b/include/migration/colo.h
index 2496a968cc..8f94054a10 100644
--- a/include/migration/colo.h
+++ b/include/migration/colo.h
@@ -25,8 +25,6 @@ void migrate_start_colo_process(MigrationState *s);
 bool migration_in_colo_state(void);
 
 /* loadvm */
-int migration_incoming_enable_colo(Error **errp);
-void migration_incoming_disable_colo(void);
 bool migration_incoming_in_colo_state(void);
 
 COLOMode get_colo_mode(void);
diff --git a/migration/migration.c b/migration/migration.c
index e56756dd04..f10abf91e2 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -604,31 +604,6 @@ int migrate_send_rp_req_pages(MigrationIncomingState *mis,
     return migrate_send_rp_message_req_pages(mis, rb, start);
 }
 
-static bool migration_colo_enabled;
-void migration_incoming_disable_colo(void)
-{
-    ram_block_discard_disable(false);
-    migration_colo_enabled = false;
-}
-
-int migration_incoming_enable_colo(Error **errp)
-{
-#ifndef CONFIG_REPLICATION
-    error_setg(errp, "ENABLE_COLO command come in migration stream, but the "
-               "replication module is not built in");
-    return -ENOTSUP;
-#endif
-
-    if (!migrate_colo()) {
-        error_setg(errp, "ENABLE_COLO command come in migration stream"
-                   ", but x-colo capability is not set");
-        return -EINVAL;
-    }
-
-    migration_colo_enabled = true;
-    return 0;
-}
-
 void migrate_add_address(SocketAddress *address)
 {
     MigrationIncomingState *mis = migration_incoming_get_current();
@@ -735,7 +710,6 @@ static void process_incoming_migration_bh(void *opaque)
             runstate_set(RUN_STATE_PAUSED);
         }
     } else if (migrate_colo()) {
-        migration_incoming_disable_colo();
         vm_start();
     } else {
         runstate_set(global_state_get_runstate());
@@ -3542,11 +3516,6 @@ static void *migration_thread(void *opaque)
         qemu_savevm_send_postcopy_advise(s->to_dst_file);
     }
 
-    if (migrate_colo()) {
-        /* Notify migration destination that we enable COLO */
-        qemu_savevm_send_colo_enable(s->to_dst_file);
-    }
-
     if (migrate_auto_converge()) {
         /* Start RAMBlock dirty bitmap sync timer */
         cpu_throttle_dirty_sync_timer(true);
diff --git a/migration/savevm.c b/migration/savevm.c
index b88851cdb7..197c89e0e6 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -90,7 +90,7 @@ enum qemu_vm_cmd {
                                       were previously sent during
                                       precopy but are dirty. */
     MIG_CMD_PACKAGED,          /* Send a wrapped stream within this stream */
-    MIG_CMD_ENABLE_COLO,       /* Enable COLO */
+    MIG_CMD_DEPRECATED_0,      /* Prior to 10.2, used as MIG_CMD_ENABLE_COLO */
     MIG_CMD_POSTCOPY_RESUME,   /* resume postcopy on dest */
     MIG_CMD_RECV_BITMAP,       /* Request for recved bitmap on dst */
     MIG_CMD_SWITCHOVER_START,  /* Switchover start notification */
@@ -1103,12 +1103,6 @@ static void qemu_savevm_command_send(QEMUFile *f,
     qemu_fflush(f);
 }
 
-void qemu_savevm_send_colo_enable(QEMUFile *f)
-{
-    trace_savevm_send_colo_enable();
-    qemu_savevm_command_send(f, MIG_CMD_ENABLE_COLO, 0, NULL);
-}
-
 void qemu_savevm_send_ping(QEMUFile *f, uint32_t value)
 {
     uint32_t buf;
@@ -2423,13 +2417,6 @@ static int loadvm_handle_recv_bitmap(MigrationIncomingState *mis,
     return 0;
 }
 
-static int loadvm_process_enable_colo(MigrationIncomingState *mis,
-                                      Error **errp)
-{
-    ERRP_GUARD();
-    return migration_incoming_enable_colo(errp);
-}
-
 static int loadvm_postcopy_handle_switchover_start(Error **errp)
 {
     SaveStateEntry *se;
@@ -2513,7 +2500,7 @@ static int loadvm_process_command(QEMUFile *f, Error **errp)
                 return ret;
             }
         }
-        break;
+        return 0;
 
     case MIG_CMD_PING:
         tmp32 = qemu_get_be32(f);
@@ -2524,7 +2511,7 @@ static int loadvm_process_command(QEMUFile *f, Error **errp)
             return -1;
         }
         migrate_send_rp_pong(mis, tmp32);
-        break;
+        return 0;
 
     case MIG_CMD_PACKAGED:
         return loadvm_handle_cmd_packaged(mis, errp);
@@ -2548,14 +2535,12 @@ static int loadvm_process_command(QEMUFile *f, Error **errp)
     case MIG_CMD_RECV_BITMAP:
         return loadvm_handle_recv_bitmap(mis, len, errp);
 
-    case MIG_CMD_ENABLE_COLO:
-        return loadvm_process_enable_colo(mis, errp);
-
     case MIG_CMD_SWITCHOVER_START:
         return loadvm_postcopy_handle_switchover_start(errp);
     }
 
-    return 0;
+    error_setg(errp, "MIG_CMD 0x%x deprecated (len 0x%x)", cmd, len);
+    return -EINVAL;
 }
 
 /*
diff --git a/migration/savevm.h b/migration/savevm.h
index 2ba0881f3b..b3d1e8a13c 100644
--- a/migration/savevm.h
+++ b/migration/savevm.h
@@ -65,7 +65,6 @@ void qemu_savevm_send_postcopy_ram_discard(QEMUFile *f, const char *name,
                                            uint16_t len,
                                            uint64_t *start_list,
                                            uint64_t *length_list);
-void qemu_savevm_send_colo_enable(QEMUFile *f);
 int qemu_save_device_state(QEMUFile *f, Error **errp);
 int qemu_loadvm_state(QEMUFile *f, Error **errp);
 void qemu_loadvm_state_cleanup(MigrationIncomingState *mis);
diff --git a/migration/trace-events b/migration/trace-events
index 90629f828f..60e5087e38 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -37,7 +37,6 @@ savevm_send_ping(uint32_t val) "0x%x"
 savevm_send_postcopy_listen(void) ""
 savevm_send_postcopy_run(void) ""
 savevm_send_postcopy_resume(void) ""
-savevm_send_colo_enable(void) ""
 savevm_send_recv_bitmap(char *name) "%s"
 savevm_send_switchover_start(void) ""
 savevm_state_setup(void) ""