add feature: 4-level-ept

Author: Josen-B

Cargo.toml

@@ -6,6 +6,7 @@ edition = "2024"
 [features]
 default = ["vmx"]
 vmx = []
+4-level-ept = ["arm_vcpu/4-level-ept"]   # TODO: Realize 4-level-ept on x86_64 and riscv64.
 
 [dependencies]
 log = "0.4"