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-rw-r--r--migration/migration-hmp-cmds.c5
-rw-r--r--migration/migration.c5
2 files changed, 10 insertions, 0 deletions
diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c
index 83176f5bae..dfe98da355 100644
--- a/migration/migration-hmp-cmds.c
+++ b/migration/migration-hmp-cmds.c
@@ -750,6 +750,11 @@ void hmp_migrate(Monitor *mon, const QDict *qdict)
                     " use blockdev-mirror with NBD instead");
     }
 
+    if (blk) {
+        warn_report("option '-b' is deprecated;"
+                    " use blockdev-mirror with NBD instead");
+    }
+
     qmp_migrate(uri, !!blk, blk, !!inc, inc,
                 false, false, true, resume, &err);
     if (hmp_handle_error(mon, err)) {
diff --git a/migration/migration.c b/migration/migration.c
index 06a706ad90..cb2d7161b5 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1625,6 +1625,11 @@ static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc,
                     " use blockdev-mirror with NBD instead");
     }
 
+    if (blk) {
+        warn_report("parameter 'blk' is deprecated;"
+                    " use blockdev-mirror with NBD instead");
+    }
+
     if (resume) {
         if (s->state != MIGRATION_STATUS_POSTCOPY_PAUSED) {
             error_setg(errp, "Cannot resume if there is no "