diff --git a/UefiCpuPkg/UefiCpuPkg.uni b/UefiCpuPkg/UefiCpuPkg.uni
index a7e279c5cb..bfd696f48c 100644
--- a/UefiCpuPkg/UefiCpuPkg.uni
+++ b/UefiCpuPkg/UefiCpuPkg.uni
@@ -195,6 +195,22 @@
 
 #string STR_gUefiCpuPkgTokenSpaceGuid_PcdIsPowerOnReset_HELP  #language en-US "Indicates if the current boot is a power-on reset."
 
+#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuSmmRestrictedMemoryAccess_PROMPT  #language en-US "Access to non-SMRAM memory is restricted to reserved, runtime and ACPI NVS type after SmmReadyToLock."
+
+#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuSmmRestrictedMemoryAccess_HELP  #language en-US "Indicate access to non-SMRAM memory is restricted to reserved, runtime and ACPI NVS type after SmmReadyToLock.<BR><BR>\n"
+                                                                                            "MMIO access is always allowed regardless of the value of this PCD.<BR>\n"
+                                                                                            "Loose of such restriction is only required by RAS components in X64 platforms.<BR>\n"
+                                                                                            "The PCD value is considered as constantly TRUE in IA32 platforms.<BR>\n"
+                                                                                            "When the PCD value is TRUE, page table is initialized to cover all memory spaces<BR>\n"
+                                                                                            "and the memory occupied by page table is protected by page table itself as read-only.<BR>\n"
+                                                                                            "In X64 build, it cannot be enabled at the same time with SMM profile feature (PcdCpuSmmProfileEnable).<BR>\n"
+                                                                                            "In X64 build, it could not be enabled also at the same time with heap guard feature for SMM<BR>\n"
+                                                                                            "(PcdHeapGuardPropertyMask in MdeModulePkg).<BR>\n"
+                                                                                            "In IA32 build, page table memory is not marked as read-only when either SMM profile feature (PcdCpuSmmProfileEnable)<BR>\n"
+                                                                                            "or heap guard feature for SMM (PcdHeapGuardPropertyMask in MdeModulePkg) is enabled.<BR>\n"
+                                                                                            "TRUE  - Access to non-SMRAM memory is restricted to reserved, runtime and ACPI NVS type after SmmReadyToLock.<BR>\n"
+                                                                                            "FALSE - Access to any type of non-SMRAM memory after SmmReadyToLock is allowed.<BR>"
+
 #string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuFeaturesCapability_PROMPT  #language en-US "Processor feature capabilities."
 
 #string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuFeaturesCapability_HELP  #language en-US "Indicates processor feature capabilities, each bit corresponding to a specific feature."