From: Ni, Ray <ray.ni@intel.com>
Sent: Tuesday, April 30, 2024 2:01 PM
To: Wu, Jiaxin <jiaxin.wu@intel.com>; devel@edk2.groups.io
Cc: Zeng, Star <star.zeng@intel.com>; Gerd Hoffmann <kraxel@redhat.com>; Kumar, Rahul R <rahul.r.kumar@intel.com>; Dong, Guo <guo.dong@intel.com>; Rhodes, Sean <sean@starlabs.systems>; Lu, James <james.lu@intel.com>; Guo, Gua <gua.guo@intel.com>; Ard Biesheuvel <ardb+tianocore@kernel.org>; Yao, Jiewen <jiewen.yao@intel.com>; Abdul Lateef Attar <AbdulLateef.Attar@amd.com>; Abner Chang <abner.chang@amd.com>; Tom Lendacky <thomas.lendacky@amd.com>
Subject: Re: [PATCH v4 00/14] Add SmmRelocationLib

Thanks,

Ray

PR: https://github.com/tianocore/edk2/pull/5546

Intel plans to separate the smbase relocation logic from
PiSmmCpuDxeSmm driver, and the related behavior will be
moved to the new interface defined by the SmmRelocationLib
class.

The SmmRelocationLib class provides the SmmRelocationInit()
interface for platform to do the smbase relocation, which
shall provide below 2 functionalities:
1. Relocate smbases for each processor.
2. Create the gSmmBaseHobGuid HOB.

With SmmRelocationLib, PiSmmCpuDxeSmm driver (which runs at
a later phase) can be simplfied as below for SMM init:
1. Consume the gSmmBaseHobGuid HOB for the relocated smbases
for each Processor.
2. Execute the early SMM Init.

Cc: Ray Ni <ray.ni@intel.com>
Cc: Zeng Star <star.zeng@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Guo Dong <guo.dong@intel.com>
Cc: Sean Rhodes <sean@starlabs.systems>
Cc: James Lu <james.lu@intel.com>
Cc: Gua Guo <gua.guo@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Abdul Lateef Attar <AbdulLateef.Attar@amd.com>
Cc: Abner Chang <abner.chang@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>

Jiaxin Wu (14):
  UefiCpuPkg: Add SmmRelocationLib class
  UefiCpuPkg/SmmRelocationLib: Add SmmRelocationLib library instance
  UefiCpuPkg/SmmRelocationLib: Rename global variables
  UefiCpuPkg/SmmRelocationLib: Avoid unnecessary memory allocation
  UefiCpuPkg/SmmRelocationLib: Remove unnecessary global variable
  UefiCpuPkg/SmmRelocationLib: Remove unnecessary CpuIndex
  UefiCpuPkg/SmmRelocationLib: Add library instance for AMD
  OvmfPkg/SmmRelocationLib: Add library instance for OVMF
  OvmfPkg/PlatformInitLib: Create gEfiSmmSmramMemoryGuid
  OvmfPkg: Refine SmmAccess implementation
  OvmfPkg/SmmCpuFeaturesLib: Check Smbase Relocation is done or not
  OvmfPkg/PlatformPei: Relocate SmBases in PEI phase
  UefiPayloadPkg/UefiPayloadPkg.dsc: Include SmmRelocationLib
  UefiCpuPkg/PiSmmCpuDxeSmm: Remove SmBases relocation logic

 OvmfPkg/AmdSev/AmdSevX64.dsc                       |   1 +
 OvmfPkg/CloudHv/CloudHvX64.dsc                     |   1 +
 OvmfPkg/Library/PlatformInitLib/MemDetect.c        | 135 +++--
 .../Library/PlatformInitLib/PlatformInitLib.inf    |   6 +-
 .../Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.c  |  33 +-
 .../Library/SmmRelocationLib}/Ia32/Semaphore.c     |  13 +-
 .../Library/SmmRelocationLib}/Ia32/SmmInit.nasm    |  83 +++-
 .../SmmRelocationLib/InternalSmmRelocationLib.h    | 127 +++++
 .../Library/SmmRelocationLib/SmmRelocationLib.c    | 549 +++++++++++++++++++++
 .../Library/SmmRelocationLib/SmmRelocationLib.inf  |  60 +++
 .../SmmRelocationLib/SmramSaveStateConfig.c        | 100 ++++
 .../Library/SmmRelocationLib}/X64/Semaphore.c      |  13 +-
 .../Library/SmmRelocationLib}/X64/SmmInit.nasm     |  85 +++-
 OvmfPkg/Microvm/MicrovmX64.dsc                     |   1 +
 OvmfPkg/OvmfPkgIa32.dsc                            |   1 +
 OvmfPkg/OvmfPkgIa32X64.dsc                         |   1 +
 OvmfPkg/OvmfPkgX64.dsc                             |   1 +
 OvmfPkg/PlatformPei/Platform.c                     |   3 +
 OvmfPkg/PlatformPei/Platform.h                     |   5 +
 OvmfPkg/PlatformPei/PlatformPei.inf                |   5 +-
 OvmfPkg/PlatformPei/SmmRelocation.c                |  80 +++
 OvmfPkg/SmmAccess/SmmAccess2Dxe.c                  |   4 +-
 OvmfPkg/SmmAccess/SmmAccess2Dxe.inf                |   5 +
 OvmfPkg/SmmAccess/SmmAccessPei.c                   | 116 ++---
 OvmfPkg/SmmAccess/SmmAccessPei.inf                 |  11 +-
 OvmfPkg/SmmAccess/SmramInternal.c                  |  72 +--
 OvmfPkg/SmmAccess/SmramInternal.h                  |  19 +-
 UefiCpuPkg/Include/Library/SmmRelocationLib.h      |  42 ++
 .../SmmRelocationLib/AmdSmmRelocationLib.inf       |  60 +++
 .../SmmRelocationLib/AmdSmramSaveStateConfig.c     | 125 +++++
 .../SmmRelocationLib}/Ia32/Semaphore.c             |  13 +-
 .../SmmRelocationLib}/Ia32/SmmInit.nasm            |  83 +++-
 .../SmmRelocationLib/InternalSmmRelocationLib.h    | 127 +++++
 .../Library/SmmRelocationLib/SmmRelocationLib.c    | 549 +++++++++++++++++++++
 .../Library/SmmRelocationLib/SmmRelocationLib.inf  |  61 +++
 .../SmmRelocationLib/SmramSaveStateConfig.c        | 136 +++++
 .../SmmRelocationLib}/X64/Semaphore.c              |  13 +-
 .../SmmRelocationLib}/X64/SmmInit.nasm             |  85 +++-
 UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c                  |  21 +-
 UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c              |  10 +-
 UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c         | 334 ++-----------
 UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h         | 103 +---
 UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf       |   4 -
 UefiCpuPkg/PiSmmCpuDxeSmm/SmmMpPerf.h              |   2 +-
 UefiCpuPkg/PiSmmCpuDxeSmm/SmramSaveState.c         |  69 ---
 UefiCpuPkg/UefiCpuPkg.dec                          |   3 +
 UefiCpuPkg/UefiCpuPkg.dsc                          |   2 +
 UefiPayloadPkg/UefiPayloadPkg.dsc                  |   2 +
 48 files changed, 2578 insertions(+), 796 deletions(-)
 copy {UefiCpuPkg/PiSmmCpuDxeSmm => OvmfPkg/Library/SmmRelocationLib}/Ia32/Semaphore.c (71%)
 copy {UefiCpuPkg/PiSmmCpuDxeSmm => OvmfPkg/Library/SmmRelocationLib}/Ia32/SmmInit.nasm (47%)
 create mode 100644 OvmfPkg/Library/SmmRelocationLib/InternalSmmRelocationLib.h
 create mode 100644 OvmfPkg/Library/SmmRelocationLib/SmmRelocationLib.c
 create mode 100644 OvmfPkg/Library/SmmRelocationLib/SmmRelocationLib.inf
 create mode 100644 OvmfPkg/Library/SmmRelocationLib/SmramSaveStateConfig.c
 copy {UefiCpuPkg/PiSmmCpuDxeSmm => OvmfPkg/Library/SmmRelocationLib}/X64/Semaphore.c (78%)
 copy {UefiCpuPkg/PiSmmCpuDxeSmm => OvmfPkg/Library/SmmRelocationLib}/X64/SmmInit.nasm (59%)
 create mode 100644 OvmfPkg/PlatformPei/SmmRelocation.c
 create mode 100644 UefiCpuPkg/Include/Library/SmmRelocationLib.h
 create mode 100644 UefiCpuPkg/Library/SmmRelocationLib/AmdSmmRelocationLib.inf
 create mode 100644 UefiCpuPkg/Library/SmmRelocationLib/AmdSmramSaveStateConfig.c
 rename UefiCpuPkg/{PiSmmCpuDxeSmm => Library/SmmRelocationLib}/Ia32/Semaphore.c (71%)
 rename UefiCpuPkg/{PiSmmCpuDxeSmm => Library/SmmRelocationLib}/Ia32/SmmInit.nasm (47%)
 create mode 100644 UefiCpuPkg/Library/SmmRelocationLib/InternalSmmRelocationLib.h
 create mode 100644 UefiCpuPkg/Library/SmmRelocationLib/SmmRelocationLib.c
 create mode 100644 UefiCpuPkg/Library/SmmRelocationLib/SmmRelocationLib.inf
 create mode 100644 UefiCpuPkg/Library/SmmRelocationLib/SmramSaveStateConfig.c
 rename UefiCpuPkg/{PiSmmCpuDxeSmm => Library/SmmRelocationLib}/X64/Semaphore.c (78%)
 rename UefiCpuPkg/{PiSmmCpuDxeSmm => Library/SmmRelocationLib}/X64/SmmInit.nasm (59%)

--
2.16.2.windows.1