UefiCpuPkg/CpuMpPei: support stack guard feature

This feature is the same as Stack Guard enabled in driver CpuDxe but
applies to PEI phase. Due to the specialty in PEI module dispatching,
this driver is changed to do the actual initialization in notify
callback of event gEfiPeiMemoryDiscoveredPpiGuid. This can let the
stack guard apply to as most PEI drivers as possible.

To let Stack Guard work, some simple page table management code are
introduced to setup Guard page at base of stack for each processor.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: "Ware, Ryan R" <ryan.r.ware@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>

UefiCpuPkg/CpuMpPei/CpuMpPei.inf

@@ -1,7 +1,7 @@
 ## @file
 #  CPU driver installs CPU PI Multi-processor PPI.
 #
-#  Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
 #  This program and the accompanying materials
 #  are licensed and made available under the terms and conditions of the BSD License
 #  which accompanies this distribution.  The full text of the license may be found at
@@ -31,6 +31,7 @@
   CpuMpPei.h
   CpuMpPei.c
   CpuBist.c
+  CpuPaging.c
 
 [Packages]
   MdePkg/MdePkg.dec
@@ -57,9 +58,17 @@
   ## UNDEFINED # HOB
   gEfiSecPlatformInformation2PpiGuid
   gEfiVectorHandoffInfoPpiGuid                  ## SOMETIMES_CONSUMES
+  gEfiPeiMemoryDiscoveredPpiGuid                ## CONSUMES
+
+[Pcd]
+  gEfiMdeModulePkgTokenSpaceGuid.PcdPteMemoryEncryptionAddressOrMask    ## CONSUMES
+  gEfiMdeModulePkgTokenSpaceGuid.PcdCpuStackGuard                       ## CONSUMES
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuStackSwitchExceptionList              ## SOMETIMES_CONSUMES
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuKnownGoodStackSize                    ## SOMETIMES_CONSUMES
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuApStackSize                           ## SOMETIMES_CONSUMES
 
 [Depex]
-  gEfiPeiMemoryDiscoveredPpiGuid
+  TRUE
 
 [UserExtensions.TianoCore."ExtraFiles"]
   CpuMpPeiExtra.uni