diff --git a/MdePkg/Include/Guid/Cper.h b/MdePkg/Include/Guid/Cper.h
index 0cacd30f01..948f586427 100644
--- a/MdePkg/Include/Guid/Cper.h
+++ b/MdePkg/Include/Guid/Cper.h
@@ -95,6 +95,18 @@ typedef struct {
   { \
     0x667DD791, 0xC6B3, 0x4c27, { 0x8A, 0x6B, 0x0F, 0x8E, 0x72, 0x2D, 0xEB, 0x41 } \
   }
+#define EFI_EVENT_NOTIFICATION_TYPE_DMAR_SEA \
+  { \
+    0x9A78788A, 0xBBE8, 0x11E4, { 0x80, 0x9E, 0x67, 0x61, 0x1E, 0x5D, 0x46, 0xB0 } \
+  }
+#define EFI_EVENT_NOTIFICATION_TYPE_DMAR_SEI \
+  { \
+    0x5C284C81, 0xB0AE, 0x4E87, { 0xA3, 0x22, 0xB0, 0x4C, 0x85, 0x62, 0x43, 0x23 } \
+  }
+#define EFI_EVENT_NOTIFICATION_TYPE_DMAR_PEI \
+  { \
+    0x09A9D5AC, 0x5204, 0x4214, { 0x96, 0xE5, 0x94, 0x99, 0x2E, 0x75, 0x2B, 0xCD } \
+  }
 ///@}
 
 ///
@@ -1207,6 +1219,9 @@ extern EFI_GUID gEfiEventNotificationTypeInitGuid;
 extern EFI_GUID gEfiEventNotificationTypeNmiGuid;
 extern EFI_GUID gEfiEventNotificationTypeBootGuid;
 extern EFI_GUID gEfiEventNotificationTypeDmarGuid;
+extern EFI_GUID gEfiEventNotificationTypeSeaGuid;
+extern EFI_GUID gEfiEventNotificationTypeSeiGuid;
+extern EFI_GUID gEfiEventNotificationTypePeiGuid;
 
 extern EFI_GUID gEfiProcessorGenericErrorSectionGuid;
 extern EFI_GUID gEfiProcessorSpecificErrorSectionGuid;
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 4bc86b05a5..c2f6b7953b 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -436,6 +436,15 @@
   ## Include/Guid/Cper.h
   gEfiEventNotificationTypeDmarGuid  = { 0x667DD791, 0xC6B3, 0x4c27, { 0x8A, 0x6B, 0x0F, 0x8E, 0x72, 0x2D, 0xEB, 0x41 }}
 
+  ## Include/Guid/Cper.h
+  gEfiEventNotificationTypeSeaGuid   = { 0x9A78788A, 0xBBE8, 0x11E4, { 0x80, 0x9E, 0x67, 0x61, 0x1E, 0x5D, 0x46, 0xB0 }}
+
+  ## Include/Guid/Cper.h
+  gEfiEventNotificationTypeSeiGuid   = { 0x5C284C81, 0xB0AE, 0x4E87, { 0xA3, 0x22, 0xB0, 0x4C, 0x85, 0x62, 0x43, 0x23 }}
+
+  ## Include/Guid/Cper.h
+  gEfiEventNotificationTypePeiGuid   = { 0x09A9D5AC, 0x5204, 0x4214, { 0x96, 0xE5, 0x94, 0x99, 0x2E, 0x75, 0x2B, 0xCD }}
+
   ## Include/Guid/Cper.h
   gEfiProcessorGenericErrorSectionGuid  = { 0x9876ccad, 0x47b4, 0x4bdb, { 0xb6, 0x5e, 0x16, 0xf1, 0x93, 0xc4, 0xf3, 0xdb }}