[PATCH] OvmfPkg: Set PciLib for TdxDxe driver

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

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3904

TdxDxe driver is introduced for Intel TDX feature. Unfortunately, this
driver also breaks boot process in SEV-ES guest. The root cause is in
the PciLib which is imported by TdxDxe driver.

In a SEV-ES guest the AmdSevDxe driver performs a
MemEncryptSevClearMmioPageEncMask() call against the
PcdPciExpressBaseAddress range to mark it shared/unencrypted. However,
the TdxDxe driver is loaded before the AmdSevDxe driver, and the PciLib
in TdxDxe is DxePciLibI440FxQ35 which will access the
PcdPciExpressBaseAddress range. Since the range has not been marked
shared/unencrypted, the #VC handler terminates the guest for trying to
do MMIO to an encrypted region.

To fix the issue TdxDxe driver set the PciLib to BasePciLibCf8.inf as
AmdSevDxe driver does.

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>
SEV-Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
TDX-Tested-by: Min Xu <min.m.xu@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
---
 OvmfPkg/IntelTdx/IntelTdxX64.dsc | 5 ++++-
 OvmfPkg/OvmfPkgX64.dsc           | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/OvmfPkg/IntelTdx/IntelTdxX64.dsc b/OvmfPkg/IntelTdx/IntelTdxX64.dsc
index 245155d41b..f58f14a1d8 100644
--- a/OvmfPkg/IntelTdx/IntelTdxX64.dsc
+++ b/OvmfPkg/IntelTdx/IntelTdxX64.dsc
@@ -704,7 +704,10 @@
   OvmfPkg/PlatformDxe/Platform.inf
   OvmfPkg/IoMmuDxe/IoMmuDxe.inf
 
-  OvmfPkg/TdxDxe/TdxDxe.inf
+  OvmfPkg/TdxDxe/TdxDxe.inf {
+    <LibraryClasses>
+    PciLib|MdePkg/Library/BasePciLibCf8/BasePciLibCf8.inf
+  }
 
   #
   # Variable driver stack (non-SMM)
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index fb2899f8a1..68e7d051d0 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -967,7 +967,10 @@
   }
   OvmfPkg/IoMmuDxe/IoMmuDxe.inf
 
-  OvmfPkg/TdxDxe/TdxDxe.inf
+  OvmfPkg/TdxDxe/TdxDxe.inf {
+    <LibraryClasses>
+    PciLib|MdePkg/Library/BasePciLibCf8/BasePciLibCf8.inf
+  }
 
 !if $(SMM_REQUIRE) == TRUE
   OvmfPkg/SmmAccess/SmmAccess2Dxe.inf
-- 
2.29.2.windows.2