From fd306d1dbc36d10f744306e92366d73273c82c8f Mon Sep 17 00:00:00 2001
From: Min Xu <min.m.xu@intel.com>
Date: Wed, 8 Dec 2021 20:54:26 +0800
Subject: MdeModulePkg: Add PcdTdxSharedBitMask

RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429

Guest Physical Address (GPA) space in Td guest is divided into private
and shared sub-spaces, determined by the SHARED bit of GPA. This PCD
holds the shared bit mask. Its default value is 0 and it will be set
in PlatformPei driver if it is of Td guest.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
---
 OvmfPkg/OvmfPkgIa32.dsc | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'OvmfPkg/OvmfPkgIa32.dsc')

diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
index 8f02dca638..01a26c234a 100644
--- a/OvmfPkg/OvmfPkgIa32.dsc
+++ b/OvmfPkg/OvmfPkgIa32.dsc
@@ -618,6 +618,9 @@
   # Set memory encryption mask
   gEfiMdeModulePkgTokenSpaceGuid.PcdPteMemoryEncryptionAddressOrMask|0x0
 
+  # Set Tdx shared bit mask
+  gEfiMdeModulePkgTokenSpaceGuid.PcdTdxSharedBitMask|0x0
+
   # Set SEV-ES defaults
   gEfiMdeModulePkgTokenSpaceGuid.PcdGhcbBase|0
   gEfiMdeModulePkgTokenSpaceGuid.PcdGhcbSize|0
-- 
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