[PATCH v2] OvmfPkg: set a default value for the WorkAreaHeader PCD

["Corvin Köhne" <c.koehne@beckhoff.com>]

SEC checks in IsSevGuest if the PCD defined WorkAreaHeader size matches the size of the WorkAreaHeader struct definition. Set a default value for the PCD to avoid unnecessary DSC/FDF file changes in all OVMF DSC/FDF files.

Signed-off-by: Corvin Köhne <c.koehne@beckhoff.com>
---
 OvmfPkg/Include/WorkArea.h     | 4 ++++
 OvmfPkg/OvmfPkg.dec            | 7 ++++++-
 OvmfPkg/OvmfPkgDefines.fdf.inc | 6 ------
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/OvmfPkg/Include/WorkArea.h b/OvmfPkg/Include/WorkArea.h
index c16030e3ac..0f9b442e43 100644
--- a/OvmfPkg/Include/WorkArea.h
+++ b/OvmfPkg/Include/WorkArea.h
@@ -25,6 +25,10 @@ typedef enum {
 // to the structure need to be kept in sync with the
 // PcdOvmfConfidentialComputingWorkAreaHeader.
 //
+// PcdOvmfConfidentialComputingWorkAreaHeader ==
+//   sizeof (CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER)
+//
+// PcdOvmfConfidentialComputingWorkAreaHeader defined in OvmfPkg/OvmfPkg.dec
 typedef struct _CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER {
   UINT8                   GuestType;
   UINT8                   Reserved1[3];
diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
index 75d47e0e00..3ed3811320 100644
--- a/OvmfPkg/OvmfPkg.dec
+++ b/OvmfPkg/OvmfPkg.dec
@@ -339,7 +339,12 @@
   # The size of this header is used early boot, and is provided through
   # a fixed PCD. It need to be kept in sync with any changes to the
   # header definition.
-  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfConfidentialComputingWorkAreaHeader|0|UINT32|0x51
+  #
+  # PcdOvmfConfidentialComputingWorkAreaHeader ==
+  #   sizeof (CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER)
+  #
+  # CONFIDENTIAL_COMPUTING_WORK_AREA_HEADER defined in OvmfPkg/Include/WorkArea.h
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfConfidentialComputingWorkAreaHeader|4|UINT32|0x51


 [PcdsDynamic, PcdsDynamicEx]
diff --git a/OvmfPkg/OvmfPkgDefines.fdf.inc b/OvmfPkg/OvmfPkgDefines.fdf.inc
index 3b5e452539..35fd454b97 100644
--- a/OvmfPkg/OvmfPkgDefines.fdf.inc
+++ b/OvmfPkg/OvmfPkgDefines.fdf.inc
@@ -82,12 +82,6 @@ SET gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwWorkingSize = $(BLOCK_SIZ
 SET gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashNvStorageFtwSpareBase = gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashNvStorageFtwWorkingBase + gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwWorkingSize
 SET gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareSize = $(VARS_SPARE_SIZE)

-# The OVMF WorkArea contains a fixed size header followed by the actual data.
-# The size of header is accessed through a fixed PCD in the reset vector code.
-# The value need to be kept in sync with the any changes to the Confidential
-# Computing Work Area header defined in the Include/WorkArea.h
-SET gUefiOvmfPkgTokenSpaceGuid.PcdOvmfConfidentialComputingWorkAreaHeader  = 4
-
 !if $(SMM_REQUIRE) == TRUE
 SET gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase64 = gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashNvStorageVariableBase
 SET gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwWorkingBase = gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashNvStorageFtwWorkingBase
--
2.11.0

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