Re: [PATCH v3 01/19] efi/libstub: Add generic support for parsing mem_encrypt=

Kevin Loughlin
2024-02-01T16:23:53Z

On Tue, Jan 30, 2024 at 11:32 PM Borislav Petkov <bp@alien8.de> wrote:
>
> On Mon, Jan 29, 2024 at 07:05:04PM +0100, Ard Biesheuvel wrote:
> > From: Ard Biesheuvel <ardb@kernel.org>
> >
> > Parse the mem_encrypt= command line parameter from the EFI stub if
> > CONFIG_ARCH_HAS_MEM_ENCRYPT=y, so that it can be passed to the early
> > boot code by the arch code in the stub.
>
> I guess all systems which do memory encryption are EFI systems anyway so
> we should not worry about the old ones...

There is at least one non-EFI firmware supporting memory encryption:
Oak stage0 firmware [0]. However, I think Ard's patch seems simple
enough to adopt in non-EFI firmware(s) if needed. I merely wanted to
point out the existence of non-EFI memory encryption systems for
potential future cases (ex: reviewing more complex patches at the
firmware interface).

[0] https://github.com/project-oak/oak/tree/main/stage0_bin