OvmfPkg: Update PlatformInitLib for Tdx guest

[mirror_edk2.git] / OvmfPkg / Library / PlatformInitLib / IntelTdx.c

diff --git a/OvmfPkg/Library/PlatformInitLib/IntelTdx.c b/OvmfPkg/Library/PlatformInitLib/IntelTdx.c
index e9196b7ffaa703a5a4864655734821ff80919ad1..c6d7c8bb6e0e73a4d97910ecd487259558acbf19 100644 (file)
--- a/OvmfPkg/Library/PlatformInitLib/IntelTdx.c
+++ b/OvmfPkg/Library/PlatformInitLib/IntelTdx.c
@@ -512,3 +512,52 @@ TransferTdxHobList (
     Hob.Raw = GET_NEXT_HOB (Hob);\r
   }\r
 }\r
+\r
+/**\r
+  In Tdx guest, the system memory is passed in TdHob by host VMM. So\r
+  the major task of PlatformTdxPublishRamRegions is to walk thru the\r
+  TdHob list and transfer the ResourceDescriptorHob and MemoryAllocationHob\r
+  to the hobs in DXE phase.\r
+\r
+  MemoryAllocationHob should also be created for Mailbox and Ovmf work area.\r
+**/\r
+VOID\r
+EFIAPI\r
+PlatformTdxPublishRamRegions (\r
+  VOID\r
+  )\r
+{\r
+  if (!TdIsEnabled ()) {\r
+    return;\r
+  }\r
+\r
+  TransferTdxHobList ();\r
+\r
+  //\r
+  // The memory region defined by PcdOvmfSecGhcbBackupBase is pre-allocated by\r
+  // host VMM and used as the td mailbox at the beginning of system boot.\r
+  //\r
+  BuildMemoryAllocationHob (\r
+    FixedPcdGet32 (PcdOvmfSecGhcbBackupBase),\r
+    FixedPcdGet32 (PcdOvmfSecGhcbBackupSize),\r
+    EfiACPIMemoryNVS\r
+    );\r
+\r
+  if (FixedPcdGet32 (PcdOvmfWorkAreaSize) != 0) {\r
+    //\r
+    // Reserve the work area.\r
+    //\r
+    // Since this memory range will be used by the Reset Vector on S3\r
+    // resume, it must be reserved as ACPI NVS.\r
+    //\r
+    // If S3 is unsupported, then various drivers might still write to the\r
+    // work area. We ought to prevent DXE from serving allocation requests\r
+    // such that they would overlap the work area.\r
+    //\r
+    BuildMemoryAllocationHob (\r
+      (EFI_PHYSICAL_ADDRESS)(UINTN)FixedPcdGet32 (PcdOvmfWorkAreaBase),\r
+      (UINT64)(UINTN)FixedPcdGet32 (PcdOvmfWorkAreaSize),\r
+      EfiBootServicesData\r
+      );\r
+  }\r
+}\r