Re: [PATCH v2 00/12] powerpc: Optimise KUAP on book3s/32

On Thu, 3 Jun 2021 08:41:35 +0000 (UTC), Christophe Leroy wrote:

This series is a rework of KUAP on book3s/32.

On book3s32, KUAP is heavier than on other platform because it can't
be opened globaly at once, it must be done for each 256Mb segment.

Instead of opening access to all necessary segments via a heavy logic,
only open access to the segment matching the start of the range.

[...]

Applied to powerpc/next.

[01/12] powerpc/32s: Move setup_{kuep/kuap}() into {kuep/kuap}.c
        https://git.kernel.org/powerpc/c/91ec66719d4c5c0e7b4e32585b01881660d1bc53
[02/12] powerpc/32s: Refactor update of user segment registers
        https://git.kernel.org/powerpc/c/91bb30822a2e1d7900f9f42e9e92647a9015f979
[03/12] powerpc/32s: move CTX_TO_VSID() into mmu-hash.h
        https://git.kernel.org/powerpc/c/7235bb3593781ed022d0714a73c2c0d8eb8a835f
[04/12] powerpc/32s: Convert switch_mmu_context() to C
        https://git.kernel.org/powerpc/c/863771a28e27dc9eaeaa88cea300370d032f0e0f
[05/12] powerpc/32s: Simplify calculation of segment register content
        https://git.kernel.org/powerpc/c/882136fb2f5208a35ddad9205b20e5791edd4782
[06/12] powerpc/32s: Initialise KUAP and KUEP in C
        https://git.kernel.org/powerpc/c/86f46f3432727933be82f64b739712a6edb9d704
[07/12] powerpc/32s: Allow disabling KUEP at boot time
        https://git.kernel.org/powerpc/c/50d2f104cd9572af476579eae9aa1b38de602ec7
[08/12] powerpc/32s: Allow disabling KUAP at boot time
        https://git.kernel.org/powerpc/c/6b4d630068b0c5cdd6d8e599182b131448e0cb06
[09/12] powerpc/32s: Rework Kernel Userspace Access Protection
        https://git.kernel.org/powerpc/c/16132529cee586ee9a058bb33cfbdcb5d884f6b3
[10/12] powerpc/32s: Activate KUAP and KUEP by default
        https://git.kernel.org/powerpc/c/9f5bd8f1471d7498c934c0a686fd0997cf872653
[11/12] powerpc/kuap: Remove KUAP_CURRENT_XXX
        https://git.kernel.org/powerpc/c/d008f8f8a0c3efe4fe1008a797f9497ea5965e27
[12/12] powerpc/kuap: Remove to/from/size parameters of prevent_user_access()
        https://git.kernel.org/powerpc/c/cb2f1fb205cc20695fcaef84baf80d9d3e54c88b

cheers