Re: [PATCH 0/3] Move memory acceptance x86 arch code into EFI stub

[Borislav Petkov]

+ Rick and linux-coco

On Mon, Sep 14, 2026 at 08:37:46PM +0200, Ard Biesheuvel wrote:
> This is a follow-up to [0].
> 
> Move arch_accept_memory(), which is only called by the EFI stub and
> never by the decompressor on a non-EFI boot, into the EFI stub, and
> avoid relying directly on decompressor APIs such as error().
> 
> Instead, call tdx_panic() on a failure to accept memory in a TDX guest.
> 
> This makes the decompressor's implementation of panic() obsolete, and
> allows it to be removed. This is a prerequisite for dropping the
> implementation of snprintf() from the EFI stub entirely, which is what
> the series containing [0] implements.
> 
> [0] http://lore.kernel.org/r/20260909115530.1924665-13-ardb+git@xxxxxxxxxx
> 
> Cc: Kiryl Shutsemau (Meta) <kas@xxxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxxxx>
> 
> Ard Biesheuvel (3):
>   x86/tdx: Share tdx_panic() with the EFI stub
>   x86/boot: Move unaccepted memory handling out of the decompressor
>   x86/boot: Drop unused implementation of panic()
> 
>  arch/x86/boot/compressed/error.c        | 19 ---------
>  arch/x86/boot/compressed/error.h        |  1 -
>  arch/x86/boot/compressed/mem.c          | 42 --------------------
>  arch/x86/boot/compressed/sev.h          |  2 -
>  arch/x86/coco/tdx/tdx-shared.c          | 35 ++++++++++++++++
>  arch/x86/coco/tdx/tdx.c                 | 35 ----------------
>  arch/x86/include/asm/sev.h              |  2 +
>  arch/x86/include/asm/shared/tdx.h       |  1 +
>  drivers/firmware/efi/libstub/x86-stub.c | 40 +++++++++++++++++++
>  9 files changed, 78 insertions(+), 99 deletions(-)
> 
> 
> base-commit: cee9395acd8043be0644b25c34bfa86623f2b935
> -- 
> 2.47.3
> 

-- 
Regards/Gruss,
    Boris.

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