Re: [RESEND PATCH v2 0/2] efi/libstub: Ensure instruction cache coherency after kernel relocation

[Ard Biesheuvel]

On Mon, 27 Apr 2026, at 10:47, WANG Rui wrote:
> Changes since [v1]:
>   * Move efi_cache_sync_image() after check_platform_features(), matching arm64.
>   * Add "()" after function name in the subject.
>
> The EFI stub relocates the kernel image by copying it to a new memory
> location using memcpy(). On architectures where the instruction and data
> caches are not automatically coherent, the copied instructions may not be
> visible to the instruction fetch unit without explicit cache maintenance.
>
> This series adds the missing call to efi_cache_sync_image() in the generic
> relocation path, and provides a LoongArch implementation using the ibar
> instruction to ensure instruction fetches observe the updated contents.
>
> [v1]: https://lore.kernel.org/loongarch/20260427034451.717817-1-r@xxxxxx
>
> WANG Rui (2):
>   efi/loongarch: Implement efi_cache_sync_image
>   efi/libstub: Synchronize instruction cache after kernel relocation
>

Queued up in efi/urgent - thanks.


>  drivers/firmware/efi/libstub/loongarch.c | 5 +++++
>  drivers/firmware/efi/libstub/relocate.c  | 1 +
>  2 files changed, 6 insertions(+)
>
> -- 
> 2.54.0