Re: [edk2-platforms][PATCH v1 1/1] IntelSiliconPkg/PeiSmmAccessLib: Remove S3 requirement

["Ni, Ray" <ray.ni@intel.com>]

Michael,
Allowing the gPeiSmmAccessPpiGuid PPI installation in normal boot will further allow gEfiPeiSmmCommunicationPpiGuid
installation in normal path, while without your change neither of the PPIs is installed in normal boot.

+ Jiewen for potential security concern.

Thanks,
Ray

> -----Original Message-----
> From: Chaganty, Rangasai V <rangasai.v.chaganty@intel.com>
> Sent: Tuesday, August 10, 2021 6:46 AM
> To: mikuback@linux.microsoft.com; devel@edk2.groups.io
> Cc: Ni, Ray <ray.ni@intel.com>
> Subject: RE: [edk2-platforms][PATCH v1 1/1] IntelSiliconPkg/PeiSmmAccessLib: Remove S3 requirement
> 
> Reviewed-by: Sai Chaganty <rangasai.v.chaganty@intel.com>
> 
> -----Original Message-----
> From: mikuback@linux.microsoft.com <mikuback@linux.microsoft.com>
> Sent: Monday, August 09, 2021 6:40 AM
> To: devel@edk2.groups.io
> Cc: Ni, Ray <ray.ni@intel.com>; Chaganty, Rangasai V <rangasai.v.chaganty@intel.com>
> Subject: [edk2-platforms][PATCH v1 1/1] IntelSiliconPkg/PeiSmmAccessLib: Remove S3 requirement
> 
> From: Michael Kubacki <michael.kubacki@microsoft.com>
> 
> REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3539
> 
> PeiInstallSmmAccessPpi() currently requires the boot mode be set to S3 to actually install gEfiPeiMmAccessPpiGuid.
> 
> This change removes this requirement in the function implementation for two reasons:
> 
> 1. Practical use cases exist to require this PPI in cases other than
>    the boot mode being set to BOOT_ON_S3_RESUME.
> 
> 2. It is poor API design to implicitly bury this requirement within
>    a function whose responsibility is to install the PPI. The caller
>    can easily place arbitrary constraints around whether to call
>    based on conditions such as the boot mode being
>    BOOT_ON_S3_RESUME.
> 
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
> Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
> ---
>  Silicon/Intel/IntelSiliconPkg/Feature/SmmAccess/Library/PeiSmmAccessLib/PeiSmmAccessLib.c | 12 ------------
>  1 file changed, 12 deletions(-)
> 
> diff --git a/Silicon/Intel/IntelSiliconPkg/Feature/SmmAccess/Library/PeiSmmAccessLib/PeiSmmAccessLib.c
> b/Silicon/Intel/IntelSiliconPkg/Feature/SmmAccess/Library/PeiSmmAccessLib/PeiSmmAccessLib.c
> index d9bf4fba983e..4df0d695fdaf 100644
> --- a/Silicon/Intel/IntelSiliconPkg/Feature/SmmAccess/Library/PeiSmmAccessLib/PeiSmmAccessLib.c
> +++ b/Silicon/Intel/IntelSiliconPkg/Feature/SmmAccess/Library/PeiSmmAcce
> +++ ssLib/PeiSmmAccessLib.c
> @@ -252,19 +252,7 @@ PeiInstallSmmAccessPpi (
>    EFI_SMRAM_HOB_DESCRIPTOR_BLOCK  *DescriptorBlock;
>    SMM_ACCESS_PRIVATE_DATA         *SmmAccessPrivate;
>    VOID                            *HobList;
> -  EFI_BOOT_MODE                   BootMode;
> 
> -  Status = PeiServicesGetBootMode (&BootMode);
> -  if (EFI_ERROR (Status)) {
> -    //
> -    // If not in S3 boot path. do nothing
> -    //
> -    return EFI_SUCCESS;
> -  }
> -
> -  if (BootMode != BOOT_ON_S3_RESUME) {
> -    return EFI_SUCCESS;
> -  }
>    //
>    // Initialize private data
>    //
> --
> 2.28.0.windows.1