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SubjectRE: [PATCH 1/2] x86/efi: Unmap efi boot services code/data regions from efi_pgd
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> > The one bit that is odd is the cpa->pfn field - for unmapped pages
> > that's totally uninteresting and I'm wondering whether setting it to 0
> > wouldn't be better.
> >
> > Does the CPU _ever_ look look at the PFN if the page is
> > !_PAGE_PRESENT, for example speculatively? If yes then what is the
> > recommended value for the pfn - zero perhaps?
> >
>
> This is L1TF, right? Isn't all ones the recommended value?
>
> I would love to see EFI start treating its mm just like any other mm at some
> point, though. That is, it should not modify any mappings in the kernel range,
> and it could use the regular mm modification APIs for the user range. But maybe
> this is a pipe dream.

Sounds good to me. I have some more fixes for EFI code and as soon as they are done,
I will start looking into this.

Regards,
Sai
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