Re: [PATCHv13 4/9] x86/boot/compressed: Handle unaccepted memory

[Borislav Petkov]

On Fri, Jun 02, 2023 at 06:17:13PM +0200, Ard Biesheuvel wrote:
> 'EFI code' is ambiguous here.
> 
> Most of the decompressor code is constructed in a way that permits
> - booting 'native EFI' via the EFI stub
> - booting 'pseudo-EFI' where GRUB or another Linux/x86 specific
> bootloader populates boot_params with all the EFI specific information
> (system table, memory map, etc)
> 
> This distinction has been abstracted away here, and so we might be
> dealing with the second case, and booting from a GRUB that does not
> understand accepted memory, but simply copied the EFI memory map
> (including unaccepted regions) as it normally does. (Note that the
> second case also covers kexec boot, so we do need to support it)

Right, I was hoping there to be some glue which sanity-checks
boot_params.efi_info instead relying on users to do so and thus have
a bunch of duplicated code.

So, yes, right after populating the boot_params pointer...

-- 
Regards/Gruss,
    Boris.

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