Re: Use gMmst from MmServiceTableLib in MmSaveStateLib

["duntan" <dun.tan@intel.com>]

AbduL,

For the part ' preserve the SAVE_STATE pointed by gSmst(Instead of gMmst)', do you mean the following code in RestoreSmmConfigurationInS3()?
gSmst->CpuSaveState          = gSmmCpuPrivate->SmmCoreEntryContext.CpuSaveState;

Acctually when PiSmmCpuDxeSmm uses MmServicesTableLib, the gSmst is the same as gMmst. You can check the lib constructor MmServicesTableLibConstructor() and SmmServicesTableLibConstructor. In the two constructor functions, they both locate the same global pointer by gEfiSmmBase2ProtocolGuid/ gEfiMmBaseProtocolGuid(same GUID)  and assign the value to gSmst or gMmst. In this case the only difference of gMmst and gSmst is the naming. So I think  PiSmmCpuDxeSmm can still consume the MmSaveStateLib even MmSaveStateLib use gMmst.

Thanks,
Dun
-----Original Message-----
From: Attar, AbdulLateef (Abdul Lateef) <AbdulLateef.Attar@amd.com> 
Sent: Tuesday, July 11, 2023 5:06 PM
To: Ni, Ray <ray.ni@intel.com>; Tan, Dun <dun.tan@intel.com>; devel@edk2.groups.io; Chang, Abner <Abner.Chang@amd.com>
Subject: RE: Use gMmst from MmServiceTableLib in MmSaveStateLib

[AMD Official Use Only - General]

Hi Ray,
        I think Michael raised the similar concerned during the patch review.
Its intentionally kept it as gSmst because of the below reason.

2. AmdMmSaveStateLib and IntelMmSaveStateLib depend on SmmServicesTableLib. Can they depend on MmServicesTableLib instead?
[Attar, AbdulLateef (Abdul Lateef)] MmSaveStateLib is mainly used by PiSmmCpuDxeSmm driver which still uses Smm convention and preserve the SAVE_STATE pointed by gSmst(Instead of gMmst).
Hence I don't think we can move to MmServicesTableLib.


Thanks
AbduL

-----Original Message-----
From: Ni, Ray <ray.ni@intel.com>
Sent: Tuesday, July 11, 2023 1:40 PM
To: Tan, Dun <dun.tan@intel.com>; devel@edk2.groups.io; Attar, AbdulLateef (Abdul Lateef) <AbdulLateef.Attar@amd.com>; Chang, Abner <Abner.Chang@amd.com>
Subject: RE: Use gMmst from MmServiceTableLib in MmSaveStateLib

Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.


Abdul,
Can you please send a patch to fix MmSaveStateLib to use gMmst (instead of gSmst)?

Using gSmst forbids the lib instance be linked by standalone MM modules.

Thanks,
Ray

> -----Original Message-----
> From: Tan, Dun <dun.tan@intel.com>
> Sent: Wednesday, July 5, 2023 4:42 PM
> To: devel@edk2.groups.io; abdattar@amd.com
> Cc: Ni, Ray <ray.ni@intel.com>
> Subject: Use gMmst from MmServiceTableLib in MmSaveStateLib
>
> Hi Abdul,
>
> In the new MmSaveStateLib created in this patch set, gSmst from 
> SmmServiceTableLib is used. This causes that only DXE_SMM_DRIVER type 
> module can consume this lib but MM_STANDALONE type module cannot.
>
> In current edk2, there are different MmServicesTableLib and
> SmmServicesTableLib:
> StadaloneMmServicesTableLib(MmServicesTableLib|MM_STANDALONE):
> initialize gMmst in standalone SMM env.
>                   MmServicesTableLib(MmServicesTableLib|DXE_SMM_DRIVER):
> initialize gMmst in legacy SMM env.
> SmmServicesTableLib(SmmServicesTableLib|DXE_SMM_DRIVER): initialize 
> gSmst in legacy SMM env.
>
> If MmSaveStateLib uses gMmst from MmServiceTableLib instead of gSmst, 
> then MmSaveStateLib can be consumed by both DXE_SMM_DRIVER and 
> MM_STANDALONE module.
> Could you pls send patch to fix this?
>
> Thanks,
> Dun
>
> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Abdul 
> Lateef Attar via groups.io
> Sent: Sunday, July 2, 2023 12:14 PM
> To: devel@edk2.groups.io
> Cc: Abdul Lateef Attar <abdattar@amd.com>; Paul Grimes 
> <paul.grimes@amd.com>; Abner Chang <abner.chang@amd.com>; Dong, Eric 
> <eric.dong@intel.com>; Ni, Ray <ray.ni@intel.com>; Kumar, Rahul R 
> <rahul.r.kumar@intel.com>; Gerd Hoffmann <kraxel@redhat.com>; Kinney, 
> Michael D <michael.d.kinney@intel.com>; Gao, Liming 
> <gaoliming@byosoft.com.cn>; Liu, Zhiguang <zhiguang.liu@intel.com>; 
> Ard Biesheuvel <ardb+tianocore@kernel.org>; Yao, Jiewen 
> <jiewen.yao@intel.com>; Justen, Jordan L <jordan.l.justen@intel.com>
> Subject: [edk2-devel] [PATCH v15 0/8] Adds AmdSmmCpuFeaturesLib and 
> MmSaveStateLib
>
> Backward-compatibility changes:
>   This patch series removes the SmmCpuFeaturesReadSaveStateRegister
>   and SmmCpuFeaturesWriteSaveStateRegister interface/function.
>   SmmReadSaveState() and SmmWriteSaveState() now directly invokes 
> MmSaveStateLib
>   routines to save/restore registers.
>
> PR: https://github.com/tianocore/edk2/pull/4597
>
> V15: Delta changes
>   Rebase the branch and fix the merge conflicts.
> V14: Delta changes
>   Added @note to the MmSaveStateLib.h.
>   SaveState(Read/Write) of
> EFI_SMM_SAVE_STATE_REGISTER_PROCESSOR_ID/EFI_MM_SAVE_STATE_REGIS
> TER_PROCESSOR_ID
>   is handled by PiSmmCpuDxeSmm driver.
>   Fixed PatchCheck warnings.
> V13: Delta changes
>   Address review comments from Ray Ni
>   Changed the BASE _NAME of AmdSmmCpuFeaturesLib.
>   Removed EFIAPI from local function.
>   Removed CpuIndex parameter from MmSaveStateGetRegisterLma
>   Modifed MmSaveStateGetRegisterIndex () to accept RegOffset
>     as second parameter.
>   Removed FILE_GUID library instance for intel implemention from 
> UefiCpuPkg.dsc.
> V12:
>   Addressed review comments from Michael.
>   Added LibraryClasses to .inf file.
>   removed duplicate MACRO definations.
>   Moved related MACRO defination to respective file.
> V11: Delta changes
>   Drop the OVMF implementation of MmSaveStateLib
> V10: Delta changes:
>   Addressed review comments from Abner.
> V9: Delta changes:
>   Addressed review comments.
>   Rename to MmSaveStateLib.
>   Also rename SMM_ defines to MM_.
>   Implemented OVMF MmSaveStateLib.
>   Removes SmmCpuFeaturesReadSaveStateRegister and 
> SmmCpuFeaturesWriteSaveStateRegister
>   function interface.
> V8 delta changes:
>    Addressed review comments from Abner,
>    Fix the whitespace error.
>    Seperate the Ovmf changes to another patch
> V7 delta changes:
>    Adds SmmSmramSaveStateLib for Intel processor.
>    Integrate SmmSmramSaveStateLib library.
> V6 delta changes:
>    Addressed review comments for Ray NI.
>    removed unnecessary EFIAPI.
> V5 delta changes:
>    rebase to master branch.
>    updated Reviewed-by
> V4 delta changes:
>   rebase to master branch.
>   added reviewed-by.
> V3 delta changes:
>   Addressed review comments from Abner chang.
>   Re-arranged patch order.
>
> Cc: Paul Grimes <paul.grimes@amd.com>
> Cc: Abner Chang <abner.chang@amd.com>
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Rahul Kumar <rahul1.kumar@intel.com>
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Cc: Michael D Kinney <michael.d.kinney@intel.com>
> Cc: Liming Gao <gaoliming@byosoft.com.cn>
> Cc: Zhiguang Liu <zhiguang.liu@intel.com>
> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> Cc: Jordan Justen <jordan.l.justen@intel.com>
> Cc: Abdul Lateef Attar <abdattar@amd.com>
>
> Abdul Lateef Attar (8):
>   MdePkg: Adds AMD SMRAM save state map
>   UefiCpuPkg: Adds MmSaveStateLib library class
>   UefiCpuPkg: Implements MmSaveStateLib library instance
>   UefiCpuPkg/SmmCpuFeaturesLib: Restructure arch-dependent code
>   UefiCpuPkg: Implements SmmCpuFeaturesLib for AMD Family
>   UefiCpuPkg: Implements MmSaveStateLib for Intel
>   UefiCpuPkg: Removes SmmCpuFeaturesReadSaveStateRegister
>   OvmfPkg: Uses MmSaveStateLib library
>
>  UefiCpuPkg/UefiCpuPkg.dec                     |   4 +
>  OvmfPkg/OvmfPkgIa32.dsc                       |   1 +
>  OvmfPkg/OvmfPkgIa32X64.dsc                    |   3 +
>  OvmfPkg/OvmfPkgX64.dsc                        |   1 +
>  UefiCpuPkg/UefiCpuPkg.dsc                     |  12 +
>  .../MmSaveStateLib/AmdMmSaveStateLib.inf      |  34 +
>  .../MmSaveStateLib/IntelMmSaveStateLib.inf    |  34 +
>  .../AmdSmmCpuFeaturesLib.inf                  |  38 +
>  UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf  |   2 +
>  .../Include/Register/Amd/SmramSaveStateMap.h  | 194 +++++
>  UefiCpuPkg/Include/Library/MmSaveStateLib.h   |  74 ++
>  .../Include/Library/SmmCpuFeaturesLib.h       |  52 --
>  .../Library/MmSaveStateLib/MmSaveState.h      |  94 +++
>  UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h    |  56 +-
>  .../SmmCpuFeaturesLib/SmmCpuFeaturesLib.c     | 767 ------------------
>  .../Library/MmSaveStateLib/AmdMmSaveState.c   | 309 +++++++
>  .../Library/MmSaveStateLib/IntelMmSaveState.c | 410 ++++++++++
>  .../MmSaveStateLib/MmSaveStateCommon.c        | 132 +++
>  .../SmmCpuFeaturesLib/AmdSmmCpuFeaturesLib.c  | 387 +++++++++
>  .../IntelSmmCpuFeaturesLib.c                  |  70 ++
>  .../SmmCpuFeaturesLibCommon.c                 | 128 ---
>  UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c    |  11 +-
>  UefiCpuPkg/PiSmmCpuDxeSmm/SmramSaveState.c    | 500 +-----------
>  MdePkg/MdePkg.ci.yaml                         |   4 +-
>  24 files changed, 1809 insertions(+), 1508 deletions(-)  create mode
> 100644 UefiCpuPkg/Library/MmSaveStateLib/AmdMmSaveStateLib.inf
>  create mode 100644
> UefiCpuPkg/Library/MmSaveStateLib/IntelMmSaveStateLib.inf
>  create mode 100644
> UefiCpuPkg/Library/SmmCpuFeaturesLib/AmdSmmCpuFeaturesLib.inf
>  create mode 100644 MdePkg/Include/Register/Amd/SmramSaveStateMap.h
>  create mode 100644 UefiCpuPkg/Include/Library/MmSaveStateLib.h
>  create mode 100644 UefiCpuPkg/Library/MmSaveStateLib/MmSaveState.h
>  create mode 100644 UefiCpuPkg/Library/MmSaveStateLib/AmdMmSaveState.c
>  create mode 100644
> UefiCpuPkg/Library/MmSaveStateLib/IntelMmSaveState.c
>  create mode 100644
> UefiCpuPkg/Library/MmSaveStateLib/MmSaveStateCommon.c
>  create mode 100644
> UefiCpuPkg/Library/SmmCpuFeaturesLib/AmdSmmCpuFeaturesLib.c
>
> --
> 2.25.1
>
>
>
> 
>