[edk2-devel] managing memory attributes in PEI

[Ard Biesheuvel]

On Tue, 23 May 2023 at 16:49, Kinney, Michael D
<michael.d.kinney at intel.com> wrote:
>
> Ard,
>
> I would prefer to keep the IA32 PEI support for OVMF.
>

Sure. But does that imply that all enhancements regarding memory
protections should be introduced there as well?

If so, could you help figure out whether or not running IA32 PEI in
32-bit compatible long mode with 4 level page tables would be
feasible? That would greatly reduce the complexity, given that PEI and
DXE will be able to share page tables, and will only need one version
of the page table logic.

> Ray had proposed an idea to introduce a library class to help
> with the DXEIPL complexity.  Perhaps that can be combines with
> this effort.
>

Indeed. But the problem remains that creating a set of page tables
that are incompatible with the present execution mode is highly
specific to IA32 PEI + X64 DXE, and this impacts the code for all
other architectures.


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