linux-kernel - Re: [PATCH v5 0/7] powerpc: Implement masked user access

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Message-ID: <176835971837.41689.5793831185458832406.b4-ty@linux.ibm.com>
Date: Wed, 14 Jan 2026 08:34:09 +0530
From: Madhavan Srinivasan <maddy@...ux.ibm.com>
To: Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
        "Christophe Leroy (CS GROUP)" <chleroy@...nel.org>
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v5 0/7] powerpc: Implement masked user access

On Wed, 24 Dec 2025 12:20:48 +0100, Christophe Leroy (CS GROUP) wrote:
> This is a rebase on top of v6.19-rc2
> 
> Masked user access avoids the address/size verification by access_ok().
> Allthough its main purpose is to skip the speculation in the
> verification of user address and size hence avoid the need of spec
> mitigation, it also has the advantage to reduce the amount of
> instructions needed so it also benefits to platforms that don't
> need speculation mitigation, especially when the size of the copy is
> not know at build time.
> 
> [...]

Applied to powerpc/next.

[1/7] powerpc/uaccess: Move barrier_nospec() out of allow_read_{from/write}_user()
      https://git.kernel.org/powerpc/c/5fbc09eb0b4f4b1a4b33abebacbeee0d29f195e9
[2/7] powerpc/uaccess: Remove unused size and from parameters from allow_access_user()
      https://git.kernel.org/powerpc/c/e3efbfbfaaaa739072b2756cfb76cd3de6d91c0f
[3/7] powerpc/uaccess: Remove {allow/prevent}_{read/write/read_write}_{from/to/}_user()
      https://git.kernel.org/powerpc/c/5458989a0e48c2bd51a7d37a04ff6ae489fe5458
[4/7] powerpc/uaccess: Refactor user_{read/write/}_access_begin()
      https://git.kernel.org/powerpc/c/704f4300315396af94e26ec0127ff0cd3fd309bf
[5/7] powerpc/32s: Fix segments setup when TASK_SIZE is not a multiple of 256M
      https://git.kernel.org/powerpc/c/fb7903771c107b0358584a359b8545060e23c530
[6/7] powerpc/32: Automatically adapt TASK_SIZE based on constraints
      https://git.kernel.org/powerpc/c/370d841929c3b863b7409047e8c84eabc4d0960f
[7/7] powerpc/uaccess: Implement masked user access
      https://git.kernel.org/powerpc/c/861574d51bbd7a06dbf07f658a9a8def012c2f74

cheers