linux-kernel - Re: [PATCH v3 01/19] efi/libstub: Add generic support for parsing mem

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Date: Thu, 1 Feb 2024 08:23:41 -0800
From: Kevin Loughlin <kevinloughlin@...gle.com>
To: Borislav Petkov <bp@...en8.de>
Cc: Ard Biesheuvel <ardb+git@...gle.com>, linux-kernel@...r.kernel.org, 
	Ard Biesheuvel <ardb@...nel.org>, Tom Lendacky <thomas.lendacky@....com>, 
	Dionna Glaze <dionnaglaze@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Ingo Molnar <mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>, 
	Andy Lutomirski <luto@...nel.org>, Arnd Bergmann <arnd@...db.de>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
	Kees Cook <keescook@...omium.org>, Brian Gerst <brgerst@...il.com>, linux-arch@...r.kernel.org, 
	llvm@...ts.linux.dev, Conrad Grobler <grobler@...gle.com>, 
	Andri Saar <andrisaar@...gle.com>, Sidharth Telang <sidtelang@...gle.com>
Subject: Re: [PATCH v3 01/19] efi/libstub: Add generic support for parsing mem_encrypt=

On Tue, Jan 30, 2024 at 11:32 PM Borislav Petkov <bp@...en8.de> wrote:
>
> On Mon, Jan 29, 2024 at 07:05:04PM +0100, Ard Biesheuvel wrote:
> > From: Ard Biesheuvel <ardb@...nel.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