diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
index 2879fc518a32..c3be3742f347 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -148,7 +148,6 @@ struct tdx_vp {
 	struct page **tdcx_pages;
 };
 
-
 static inline u64 mk_keyed_paddr(u16 hkid, struct page *page)
 {
 	u64 ret;
@@ -158,10 +157,16 @@ static inline u64 mk_keyed_paddr(u16 hkid, struct page *page)
 	ret |= (u64)hkid << boot_cpu_data.x86_phys_bits;
 
 	return ret;
+}
 
+static inline int pg_level_to_tdx_sept_level(enum pg_level level)
+{
+        WARN_ON_ONCE(level == PG_LEVEL_NONE);
+        return level - 1;
 }
 
 u64 tdh_mng_addcx(struct tdx_td *td, struct page *tdcs_page);
+u64 tdh_mem_sept_add(struct tdx_td *td, u64 gpa, int level, struct page *page, u64 *ext_err1, u64 *ext_err2);
 u64 tdh_vp_addcx(struct tdx_vp *vp, struct page *tdcx_page);
 u64 tdh_mng_key_config(struct tdx_td *td);
 u64 tdh_mng_create(struct tdx_td *td, u16 hkid);
diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index 3a272e9ff2ca..506a75fbac0b 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -1529,6 +1529,25 @@ u64 tdh_mng_addcx(struct tdx_td *td, struct page *tdcs_page)
 }
 EXPORT_SYMBOL_GPL(tdh_mng_addcx);
 
+u64 tdh_mem_sept_add(struct tdx_td *td, u64 gpa, int level, struct page *page, u64 *ext_err1, u64 *ext_err2)
+{
+	struct tdx_module_args args = {
+		.rcx = gpa | level,
+		.rdx = tdx_tdr_pa(td),
+		.r8 = page_to_phys(page),
+	};
+	u64 ret;
+
+	tdx_clflush_page(page);
+	ret = seamcall_ret(TDH_MEM_SEPT_ADD, &args);
+
+	*ext_err1 = args.rcx;
+	*ext_err2 = args.rdx;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(tdh_mem_sept_add);
+
 u64 tdh_vp_addcx(struct tdx_vp *vp, struct page *tdcx_page)
 {
 	struct tdx_module_args args = {
diff --git a/arch/x86/virt/vmx/tdx/tdx.h b/arch/x86/virt/vmx/tdx/tdx.h
index da384387d4eb..f3e37df4c63a 100644
--- a/arch/x86/virt/vmx/tdx/tdx.h
+++ b/arch/x86/virt/vmx/tdx/tdx.h
@@ -15,6 +15,7 @@
  * TDX module SEAMCALL leaf functions
  */
 #define TDH_MNG_ADDCX			1
+#define TDH_MEM_SEPT_ADD		3
 #define TDH_VP_ADDCX			4
 #define TDH_MNG_KEY_CONFIG		8
 #define TDH_MNG_CREATE			9