Re: [PATCH v2] hw: arm: Support direct boot for Linux/arm64 EFI zboot images

[Peter Maydell]

On Fri, 3 Mar 2023 at 16:01, Ard Biesheuvel <ardb@kernel.org> wrote:
>
> Fedora 39 will ship its arm64 kernels in the new generic EFI zboot
> format, using gzip compression for the payload.
>
> For doing EFI boot in QEMU, this is completely transparent, as the
> firmware or bootloader will take care of this. However, for direct
> kernel boot without firmware, we will lose the ability to boot such
> distro kernels unless we deal with the new format directly.
>
> EFI zboot images contain metadata in the header regarding the placement
> of the compressed payload inside the image, and the type of compression
> used. This means we can wire up the existing gzip support without too
> much hassle, by parsing the header and grabbing the payload from inside
> the loaded zboot image.
>
> Cc: Peter Maydell <peter.maydell@linaro.org>
> Cc: Alex Bennée <alex.bennee@linaro.org>
> Cc: Richard Henderson <richard.henderson@linaro.org>
> Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> ---



Applied to target-arm.next, thanks.

-- PMM