diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
index aa4ab4c847fd..165730656934 100644
--- a/drivers/vdpa/mlx5/core/mr.c
+++ b/drivers/vdpa/mlx5/core/mr.c
@@ -166,9 +166,12 @@ again:
 			klm->bcount = cpu_to_be32(klm_bcount(dmr->end - dmr->start));
 			preve = dmr->end;
 		} else {
+			u64 bcount = min_t(u64, dmr->start - preve, MAX_KLM_SIZE);
+
 			klm->key = cpu_to_be32(mvdev->res.null_mkey);
-			klm->bcount = cpu_to_be32(klm_bcount(dmr->start - preve));
-			preve = dmr->start;
+			klm->bcount = cpu_to_be32(klm_bcount(bcount));
+			preve += bcount;
+
 			goto again;
 		}
 	}