[PATCH V2 07/14] OvmfPkg: Add PCD and DEFINEs for Lazy Accept page.

["Min Xu" <min.m.xu@intel.com>]

From: Min M Xu <min.m.xu@intel.com>

RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3937

Lazy accept page can be controlled in build time like below:
  -D LAZY_ACCEPT_PARTIAL_MEM=512

The unit is MB. If it is 0 then it means Lazy-accept is turned off.

Lazy-accept is turned off by default in OvmfPkgX64.
Lazy-accept is turned on with 512MB by default in IntelTdxX64.

Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
---
 OvmfPkg/IntelTdx/IntelTdxX64.dsc | 8 ++++++++
 OvmfPkg/OvmfPkg.dec              | 4 ++++
 OvmfPkg/OvmfPkgX64.dsc           | 9 +++++++++
 3 files changed, 21 insertions(+)

diff --git a/OvmfPkg/IntelTdx/IntelTdxX64.dsc b/OvmfPkg/IntelTdx/IntelTdxX64.dsc
index 71b1cf8e7090..7ab2dc6fffe4 100644
--- a/OvmfPkg/IntelTdx/IntelTdxX64.dsc
+++ b/OvmfPkg/IntelTdx/IntelTdxX64.dsc
@@ -62,6 +62,11 @@
   #
   DEFINE UP_CPU_DXE_GUID  = 6490f1c5-ebcc-4665-8892-0075b9bb49b7
 
+  #
+  # Define the size of lazy accepted memory. The unit is MB.
+  #
+  DEFINE LAZY_ACCEPT_PARTIAL_MEM = 512
+
 [BuildOptions]
   GCC:RELEASE_*_*_CC_FLAGS             = -DMDEPKG_NDEBUG
   INTEL:RELEASE_*_*_CC_FLAGS           = /D MDEPKG_NDEBUG
@@ -453,6 +458,9 @@
   # Point to the MdeModulePkg/Application/UiApp/UiApp.inf
   gEfiMdeModulePkgTokenSpaceGuid.PcdBootManagerMenuFile|{ 0x21, 0xaa, 0x2c, 0x46, 0x14, 0x76, 0x03, 0x45, 0x83, 0x6e, 0x8a, 0xb6, 0xf4, 0x66, 0x23, 0x31 }
 
+  # The partial memory size in Lazy accept
+  gUefiOvmfPkgTokenSpaceGuid.PcdLazyAcceptPartialMemorySize|$(LAZY_ACCEPT_PARTIAL_MEM)
+
 ################################################################################
 #
 # Pcd Dynamic Section - list of all EDK II PCD Entries defined by this Platform
diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
index 5af76a540529..49fc20831ad0 100644
--- a/OvmfPkg/OvmfPkg.dec
+++ b/OvmfPkg/OvmfPkg.dec
@@ -399,6 +399,10 @@
   ## The Tdx accept page size. 0x1000(4k),0x200000(2M)
   gUefiOvmfPkgTokenSpaceGuid.PcdTdxAcceptPageSize|0x200000|UINT32|0x65
 
+  ## The partial memory size in Lazy accept. Its unit is MB.
+  ## The default value is 0 which means lazy accept is turned off.
+  gUefiOvmfPkgTokenSpaceGuid.PcdLazyAcceptPartialMemorySize|0|UINT64|0x68
+
 [PcdsDynamic, PcdsDynamicEx]
   gUefiOvmfPkgTokenSpaceGuid.PcdEmuVariableEvent|0|UINT64|2
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashVariablesEnable|FALSE|BOOLEAN|0x10
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index 6e68f60dc90f..026251ae7e69 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -78,6 +78,12 @@
   DEFINE UP_CPU_PEI_GUID  = 280251c4-1d09-4035-9062-839acb5f18c1
   DEFINE UP_CPU_DXE_GUID  = 6490f1c5-ebcc-4665-8892-0075b9bb49b7
 
+  #
+  # Define the size of lazy accepted memory. The unit is MB.
+  # In OvmfPkgX64, the lazy accept page is disabled by default.
+  #
+  DEFINE LAZY_ACCEPT_PARTIAL_MEM = 0
+
 [BuildOptions]
   GCC:RELEASE_*_*_CC_FLAGS             = -DMDEPKG_NDEBUG
   INTEL:RELEASE_*_*_CC_FLAGS           = /D MDEPKG_NDEBUG
@@ -600,6 +606,9 @@
   # Point to the MdeModulePkg/Application/UiApp/UiApp.inf
   gEfiMdeModulePkgTokenSpaceGuid.PcdBootManagerMenuFile|{ 0x21, 0xaa, 0x2c, 0x46, 0x14, 0x76, 0x03, 0x45, 0x83, 0x6e, 0x8a, 0xb6, 0xf4, 0x66, 0x23, 0x31 }
 
+  # The partial memory size in Lazy accept
+  gUefiOvmfPkgTokenSpaceGuid.PcdLazyAcceptPartialMemorySize|$(LAZY_ACCEPT_PARTIAL_MEM)
+
 ################################################################################
 #
 # Pcd Dynamic Section - list of all EDK II PCD Entries defined by this Platform
-- 
2.29.2.windows.2