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

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Date:   Fri, 18 Jun 2021 13:51:36 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: 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