[edk2-devel] [edk2-platforms][PATCH v1 1/1] IntelSiliconPkg/PeiSmmAccessLib: Remove S3 requirement
Ni, Ray
ray.ni at intel.com
Thu Aug 12 05:20:02 UTC 2021
Michael,
I need Jiewen's input on why MmAccess and MmCommunication PPIs were not installed in normal boot path. Without understanding the reason, I don't have confidence to approve the change.
Sai,
Do you see other impacts to Intel platforms with this behavior change?
Thanks,
Ray
-----Original Message-----
From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Michael Kubacki
Sent: Tuesday, August 10, 2021 11:36 PM
To: devel at edk2.groups.io; Ni, Ray <ray.ni at intel.com>; Chaganty, Rangasai V <rangasai.v.chaganty at intel.com>
Cc: Yao, Jiewen <jiewen.yao at intel.com>
Subject: Re: [edk2-devel] [edk2-platforms][PATCH v1 1/1] IntelSiliconPkg/PeiSmmAccessLib: Remove S3 requirement
Installation is a platform decision. The buried dependency on boot mode in this particular function is just a roadblock platforms have to work around. The role of this API is to install the PPI.
Thanks,
Michael
On 8/9/2021 9:47 PM, Ni, Ray wrote:
> 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 at intel.com>
>> Sent: Tuesday, August 10, 2021 6:46 AM
>> To: mikuback at linux.microsoft.com; devel at edk2.groups.io
>> Cc: Ni, Ray <ray.ni at intel.com>
>> Subject: RE: [edk2-platforms][PATCH v1 1/1]
>> IntelSiliconPkg/PeiSmmAccessLib: Remove S3 requirement
>>
>> Reviewed-by: Sai Chaganty <rangasai.v.chaganty at intel.com>
>>
>> -----Original Message-----
>> From: mikuback at linux.microsoft.com <mikuback at linux.microsoft.com>
>> Sent: Monday, August 09, 2021 6:40 AM
>> To: devel at edk2.groups.io
>> Cc: Ni, Ray <ray.ni at intel.com>; Chaganty, Rangasai V
>> <rangasai.v.chaganty at intel.com>
>> Subject: [edk2-platforms][PATCH v1 1/1]
>> IntelSiliconPkg/PeiSmmAccessLib: Remove S3 requirement
>>
>> From: Michael Kubacki <michael.kubacki at 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 at intel.com>
>> Cc: Rangasai V Chaganty <rangasai.v.chaganty at intel.com>
>> Signed-off-by: Michael Kubacki <michael.kubacki at 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/PeiSmmAcces
>> sLib/PeiSmmAccessLib.c
>> b/Silicon/Intel/IntelSiliconPkg/Feature/SmmAccess/Library/PeiSmmAcces
>> sLib/PeiSmmAccessLib.c index d9bf4fba983e..4df0d695fdaf 100644
>> ---
>> a/Silicon/Intel/IntelSiliconPkg/Feature/SmmAccess/Library/PeiSmmAcces
>> sLib/PeiSmmAccessLib.c
>> +++ b/Silicon/Intel/IntelSiliconPkg/Feature/SmmAccess/Library/PeiSmmA
>> +++ cce
>> +++ 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
>
>
>
>
>
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