migration: Create migrate_rdma()

Helper to say if we are doing a migration over rdma.

Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Li Zhijian <lizhijian@fujitsu.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231011203527.9061-2-quintela@redhat.com>

migration/options.c

@@ -378,6 +378,13 @@ bool migrate_postcopy(void)
     return migrate_postcopy_ram() || migrate_dirty_bitmaps();
 }
 
+bool migrate_rdma(void)
+{
+    MigrationState *s = migrate_get_current();
+
+    return s->rdma_migration;
+}
+
 bool migrate_tls(void)
 {
     MigrationState *s = migrate_get_current();