OvmfPkg: Refine SmmAccess implementation

This patch refines the SmmAccess implementation:
1. SmramMap will be retrieved from the
gEfiSmmSmramMemoryGuid instead of original from
the TSEG Memory Base register.
2. Remove the gEfiAcpiVariableGuid creation, thus
the DESCRIPTOR_INDEX definition can be also cleaned.
3. The gEfiAcpiVariableGuid HOB is moved to the
OvmfPkg/Library/PlatformInitLib/PlatformInitLib.inf.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Ray Ni <ray.ni@intel.com>
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/OvmfPkg/SmmAccess/SmmAccessPei.inf b/OvmfPkg/SmmAccess/SmmAccessPei.inf
index 1698c4ce6c..1e7cedf290 100644
--- a/OvmfPkg/SmmAccess/SmmAccessPei.inf
+++ b/OvmfPkg/SmmAccess/SmmAccessPei.inf
@@ -2,11 +2,10 @@
 # A PEIM with the following responsibilities:

 #

 # - provide SMRAM access by producing PEI_SMM_ACCESS_PPI,

-# - verify & configure the Q35 TSEG in the entry point,

-# - set aside the SMM_S3_RESUME_STATE object at the bottom of TSEG, and expose

-#   it via the gEfiAcpiVariableGuid GUIDed HOB.

+# - verify & configure the Q35 TSEG in the entry point.

 #

 # Copyright (C) 2013, 2015, Red Hat, Inc.

+# Copyright (c) 2024 Intel Corporation.

 #

 # SPDX-License-Identifier: BSD-2-Clause-Patent

 #

@@ -36,9 +35,6 @@
   MdePkg/MdePkg.dec

   OvmfPkg/OvmfPkg.dec

 

-[Guids]

-  gEfiAcpiVariableGuid

-

 [LibraryClasses]

   BaseLib

   BaseMemoryLib

@@ -57,6 +53,9 @@
   gUefiOvmfPkgTokenSpaceGuid.PcdQ35SmramAtDefaultSmbase

   gUefiOvmfPkgTokenSpaceGuid.PcdQ35TsegMbytes

 

+[Guids]

+  gEfiSmmSmramMemoryGuid             # ALWAYS_CONSUMED

+

 [Ppis]

   gPeiSmmAccessPpiGuid           ## PRODUCES