[PATCH v5 09/23] powerpc/book3s64/kuap: Use Key 3 for kernel mapping with hash translation

[Sandipan Das]

On 27/08/20 9:39 am, Aneesh Kumar K.V wrote:
> This patch updates kernel hash page table entries to use storage key 3
> for its mapping. This implies all kernel access will now use key 3 to
> control READ/WRITE. The patch also prevents the allocation of key 3 from
> userspace and UAMOR value is updated such that userspace cannot modify key 3.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>
> ---
>  .../powerpc/include/asm/book3s/64/hash-pkey.h | 24 ++++++++++++++-----
>  arch/powerpc/include/asm/book3s/64/hash.h     |  2 +-
>  arch/powerpc/include/asm/book3s/64/mmu-hash.h |  1 +
>  arch/powerpc/include/asm/mmu_context.h        |  2 +-
>  arch/powerpc/mm/book3s64/hash_4k.c            |  2 +-
>  arch/powerpc/mm/book3s64/hash_64k.c           |  4 ++--
>  arch/powerpc/mm/book3s64/hash_hugepage.c      |  2 +-
>  arch/powerpc/mm/book3s64/hash_hugetlbpage.c   |  2 +-
>  arch/powerpc/mm/book3s64/hash_pgtable.c       |  2 +-
>  arch/powerpc/mm/book3s64/hash_utils.c         | 10 ++++----
>  arch/powerpc/mm/book3s64/pkeys.c              |  4 ++++
>  11 files changed, 37 insertions(+), 18 deletions(-)
> 

Reviewed-by: Sandipan Das <sandipan at linux.ibm.com>