diff --git a/Cargo.toml b/Cargo.toml
index ef81e59..22edc44 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "axvcpu"
 authors = ["aarkegz <aarkegz@gmail.com>"]
-version = "0.2.0"
+version = "0.2.1"
 edition = "2024"
 categories = ["virtualization", "no-std"]
 description = "Virtual CPU abstraction for ArceOS hypervisor"
@@ -13,5 +13,5 @@ license = "Apache-2.0"
 axerrno = "0.1.0"
 memory_addr = "0.4"
 percpu = "0.2.0"
-axaddrspace = "0.1"
+axaddrspace = "0.1.4"
 axvisor_api = "0.1"
diff --git a/src/percpu.rs b/src/percpu.rs
index b0e9ffb..cddb5f1 100644
--- a/src/percpu.rs
+++ b/src/percpu.rs
@@ -30,6 +30,10 @@ pub trait AxArchPerCpu: Sized {
     fn hardware_enable(&mut self) -> AxResult;
     /// Disable hardware virtualization on the current CPU.
     fn hardware_disable(&mut self) -> AxResult;
+    /// Return max guest page table levels used by the architecture.
+    fn max_guest_page_table_levels(&self) -> usize {
+        4
+    }
 }
 
 /// Host per-CPU states to run the guest.