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.si...@amd.com>
Cc: Erdem Aktas <erdemak...@google.com>
Cc: James Bottomley <j...@linux.ibm.com>
Cc: Jiewen Yao <jiewen....@intel.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
SEV-Tested-by: Tom Lendacky <thomas.lenda...@amd.com>
TDX-Tested-by: Min Xu <min.m...@intel.com>
Signed-off-by: Min Xu <min.m...@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
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