Re: [PATCH v2 1/2] x86: only modify setup_data if the boot protocol indicates safety

[Gerd Hoffmann]

On Tue, Sep 06, 2022 at 12:36:56PM +0200, Jason A. Donenfeld wrote:
> It's only safe to modify the setup_data pointer on newer kernels where
> the EFI stub loader will ignore it. So condition setting that offset on
> the newer boot protocol version. While we're at it, gate this on SEV too.
> This depends on the kernel commit linked below going upstream.
> 
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Cc: Laurent Vivier <laurent@vivier.eu>
> Cc: Michael S. Tsirkin <mst@redhat.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Peter Maydell <peter.maydell@linaro.org>
> Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
> Cc: Richard Henderson <richard.henderson@linaro.org>
> Cc: Ard Biesheuvel <ardb@kernel.org>
> Link: 
> https://lore.kernel.org/linux-efi/20220904165321.1140894-1-Jason@zx2c4.com/
> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Acked-by: Gerd Hoffmann <kraxel@redhat.com>

take care,
  Gerd