diff --git a/src/libos/src/exception/cpuid.rs b/src/libos/src/exception/cpuid.rs
index c258e34f..17718092 100644
--- a/src/libos/src/exception/cpuid.rs
+++ b/src/libos/src/exception/cpuid.rs
@@ -6,9 +6,7 @@ use std::rsgx_cpuidex;
 
 pub const CPUID_OPCODE: u16 = 0xA20F;
 const CPUID_MIN_BASIC_LEAF: u32 = 0;
-const CPUID_MAX_BASIC_LEAF: u32 = 0x1F;
 const CPUID_MIN_EXTEND_LEAF: u32 = 0x8000_0000;
-const CPUID_MAX_EXTEND_LEAF: u32 = 0x8000_0008;
 const CPUID_MAX_SUBLEAF: u32 = u32::max_value();
 
 #[repr(C)]
@@ -146,23 +144,11 @@ impl CpuIdCache {
 impl CpuId {
     pub fn new() -> CpuId {
         let max_basic_leaf = match rsgx_cpuidex(CPUID_MIN_BASIC_LEAF as i32, 0) {
-            Ok(sgx_cpuinfo) => {
-                if is_valid_cpuid_basic_leaf(sgx_cpuinfo[0] as u32) {
-                    sgx_cpuinfo[0] as u32
-                } else {
-                    panic!("invalid basic cpuid_level")
-                }
-            }
+            Ok(sgx_cpuinfo) => sgx_cpuinfo[0] as u32,
             _ => panic!("failed to call sgx_cpuidex"),
         };
         let max_extend_leaf = match rsgx_cpuidex(CPUID_MIN_EXTEND_LEAF as i32, 0) {
-            Ok(sgx_cpuinfo) => {
-                if is_valid_cpuid_extend_leaf(sgx_cpuinfo[0] as u32) {
-                    sgx_cpuinfo[0] as u32
-                } else {
-                    panic!("invalid extend cpuid_xlevel")
-                }
-            }
+            Ok(sgx_cpuinfo) => sgx_cpuinfo[0] as u32,
             _ => panic!("failed to call sgx_cpuidex"),
         };
         let cpuid = CpuId {
@@ -227,14 +213,6 @@ lazy_static! {
     static ref CPUID: CpuId = CpuId::new();
 }
 
-fn is_valid_cpuid_basic_leaf(leaf: u32) -> bool {
-    (CPUID_MIN_BASIC_LEAF..=CPUID_MAX_BASIC_LEAF).contains(&leaf)
-}
-
-fn is_valid_cpuid_extend_leaf(leaf: u32) -> bool {
-    (CPUID_MIN_EXTEND_LEAF..=CPUID_MAX_EXTEND_LEAF).contains(&leaf)
-}
-
 fn is_cpuid_leaf_has_subleaves(leaf: u32) -> bool {
     const CPUID_LEAF_WITH_SUBLEAF: [u32; 11] =
         [0x4, 0x7, 0xB, 0xD, 0xF, 0x10, 0x12, 0x14, 0x17, 0x18, 0x1F];