linux-kernel - Re: [PATCH v14 00/11] Support page table check on PowerPC

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Message-ID: <7f40b03a926145e79c060f5a0cfdab829b2a5f1c.camel@linux.ibm.com>
Date: Mon, 12 May 2025 15:04:55 +1000
From: Andrew Donnellan <ajd@...ux.ibm.com>
To: linuxppc-dev@...ts.ozlabs.org, akpm@...ux-foundation.org,
        maddy@...ux.ibm.com
Cc: x86@...nel.org, linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        pasha.tatashin@...een.com, sweettea-kernel@...miny.me,
        christophe.leroy@...roup.eu
Subject: Re: [PATCH v14 00/11] Support page table check on PowerPC

On Fri, 2025-04-11 at 15:43 +1000, Andrew Donnellan wrote:
> Support page table check on all PowerPC platforms. This works by
> serialising assignments, reassignments and clears of page table
> entries at each level in order to ensure that anonymous mappings
> have at most one writable consumer, and likewise that file-backed
> mappings are not simultaneously also anonymous mappings.
> 
> In order to support this infrastructure, a number of stubs must be
> defined for all powerpc platforms. Additionally, separate
> set_pte_at()
> and set_pte_at_unchecked(), to allow for internal, uninstrumented
> mappings.
> 
> (This series was written by Rohan McLure, who has left IBM and is no
> longer
> working on powerpc.)

Anything more we need to get this merged?

Thanks,
-- 
Andrew Donnellan    OzLabs, ADL Canberra
ajd@...ux.ibm.com   IBM Australia Limited