[edk2-devel] Question about Smm code / StandaloneMmPkg

[Kun Qin]

Hi Tiger,

Our team has been sending patches to the community to cover Standalone MM driver to support x86 arch recently by believing that Standalone MM is the direction we are moving to in the long term.

From our experience so far, the Standalone MM core infrastructure is arch independent and capable of operations such as dispatching MM drivers and managing memory as is. What really is missing would be the StandaloneMmCpu and an IPL that can install MM foundation for x86 arch. But I am unaware of any public implementation for these 2 components at this moment. As I joined this Standalone MM journey relatively recently, maybe other community members will have more information in that regards.

Generally from our perspective, we are taking Standalone Mm model as an opportunity to provide better isolation between MM and non-MM environment, since this model is providing cleaner boundary inside MM without convoluted access to non-MM (mostly DXE) environment. If x86 SMM core code will ever be added to Standalone MM implemation, I would hope we do not lose advantage on that specific point.

Thanks,
Kun

From: Laszlo Ersek<mailto:lersek at redhat.com>
Sent: Thursday, March 4, 2021 12:55
To: devel at edk2.groups.io<mailto:devel at edk2.groups.io>; tigerliu at zhaoxin.com<mailto:tigerliu at zhaoxin.com>; Kinney, Michael D<mailto:michael.d.kinney at intel.com>; Kun Qin<mailto:kun.q at outlook.com>
Subject: Re: [edk2-devel] Question about Smm code / StandaloneMmPkg

Adding Kun Qin; a comment below:

On 03/04/21 09:34, Tiger Liu(BJ-RD) wrote:
> Dear All:
> I have a few questions about Smm code and StandaloneMmPkg.
>
> Take X86 Arch cpu as example:
> 1. Smm infrastructure code is implemented in MdeModulePkg\Core\PiSmmCore
>    But it's a traditional smm mode, used launched in UEFI DXE Phase.
>
> A_Tour_Beyond_BIOS_Launching_Standalone_SMM_Drivers_in_PEI_using_the_EFI_Developer_Kit_II.pdf
> ----> This doc introduced a standalone smm mode.
>
> PI Spec introduces a MM concept, it's arch independent.
>
> So, I have below questions:
> 1. Will X86 SMM code implementation be migrated to MM concept code base?
> 2. StandaloneMmPkg is a MM reference implementation, is it arch independent?
> 3. The above doc mentioned launching SMM drivers in PEI,  is it also implemented in StandaloneMmPkg?

Please see (also) the following thread:

  [edk2-rfc] [RFC]
  Support Both MM Traditional and Standalone Drivers with One MM Core

  https://edk2.groups.io/g/rfc/message/430

Thanks
Laszlo


>
> Thanks
>
>
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