[edk2-devel] [PATCH V2 26/28] OvmfPkg/QemuFwCfgLib: Support Tdx in QemuFwCfgDxe

[Min Xu]

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

In the previous QemuFwCfgDxe only SEV is supported. This commit
introduce TDX support in QemuFwCfgDxe.

Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org>
Cc: Jordan Justen <jordan.l.jus...@intel.com>
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>
Signed-off-by: Min Xu <min.m...@intel.com>
---
 OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.c      | 9 +++++----
 OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxeLib.inf | 1 +
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.c 
b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.c
index 0182c9235cac..7a60b3e82863 100644
--- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.c
+++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.c
@@ -19,6 +19,7 @@
 #include <Library/DebugLib.h>
 #include <Library/QemuFwCfgLib.h>
 #include <Library/UefiBootServicesTableLib.h>
+#include <Library/MemEncryptTdxLib.h>
 #include <Library/MemEncryptSevLib.h>
 
 #include "QemuFwCfgLibInternal.h"
@@ -85,7 +86,7 @@ QemuFwCfgInitialize (
     DEBUG ((DEBUG_INFO, "QemuFwCfg interface (DMA) is supported.\n"));
   }
 
-  if (mQemuFwCfgDmaSupported && MemEncryptSevIsEnabled ()) {
+  if (mQemuFwCfgDmaSupported && (MemEncryptSevIsEnabled () || 
(MemEncryptTdxIsEnabled ()))) {
     EFI_STATUS   Status;
 
     //
@@ -96,7 +97,7 @@ QemuFwCfgInitialize (
                     (VOID **)&mIoMmuProtocol);
     if (EFI_ERROR (Status)) {
       DEBUG ((DEBUG_ERROR,
-        "QemuFwCfgSevDma %a:%a Failed to locate IOMMU protocol.\n",
+        "QemuFwCfgDma %a:%a Failed to locate IOMMU protocol.\n",
         gEfiCallerBaseName, __FUNCTION__));
       ASSERT (FALSE);
       CpuDeadLoop ();
@@ -371,10 +372,10 @@ InternalQemuFwCfgDmaBytes (
   DataBuffer = Buffer;
 
   //
-  // When SEV is enabled, map Buffer to DMA address before issuing the DMA
+  // When SEV or TDX is enabled, map Buffer to DMA address before issuing the 
DMA
   // request
   //
-  if (MemEncryptSevIsEnabled ()) {
+  if (MemEncryptSevIsEnabled() || MemEncryptTdxIsEnabled ()) {
     VOID                  *AccessBuffer;
     EFI_PHYSICAL_ADDRESS  DataBufferAddress;
 
diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxeLib.inf 
b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxeLib.inf
index 48899ff1236a..ce3eaa5ed8b4 100644
--- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxeLib.inf
+++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxeLib.inf
@@ -43,6 +43,7 @@
   IoLib
   MemoryAllocationLib
   MemEncryptSevLib
+  MemEncryptTdxLib
 
 [Protocols]
   gEdkiiIoMmuProtocolGuid                         ## SOMETIMES_CONSUMES
-- 
2.29.2.windows.2



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