[PATCH 3/3] arm64: mm: Add feature override support for LVA and E0PD

[Will Deacon]

On Tue, Nov 15, 2022 at 03:38:24PM +0100, Ard Biesheuvel wrote:
> Add support for overriding the VARange and E0PD fields of the MMFR2 CPU
> ID register. This permits the associated features to be overridden early
> enough for the boot code that creates the kernel mapping to take it into
> account.
> 
> Signed-off-by: Ard Biesheuvel <ardb at kernel.org>
> ---
>  arch/arm64/include/asm/assembler.h    | 17 ++++++++++-------
>  arch/arm64/include/asm/cpufeature.h   |  1 +
>  arch/arm64/kernel/cpufeature.c        |  6 +++++-
>  arch/arm64/kernel/image-vars.h        |  1 +
>  arch/arm64/kernel/pi/idreg-override.c |  8 +++++++-
>  arch/arm64/kernel/pi/map_kernel.c     |  4 ++++
>  6 files changed, 28 insertions(+), 9 deletions(-)

What's the rationale for overriding E0PD? It seems unrelated to the rest of
the series.

Will