linux-kernel - Re: [PATCH v13 00/11] Support page table check on PowerPC

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Message-ID: <006ac081cf0e130426bcf0ef777bed346f6df002.camel@linux.ibm.com>
Date: Thu, 13 Mar 2025 13:54:39 +1100
From: Andrew Donnellan <ajd@...ux.ibm.com>
To: linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
        pasha.tatashin@...een.com, akpm@...ux-foundation.org,
        maddy@...ux.ibm.com
Cc: x86@...nel.org, linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        sweettea-kernel@...miny.me
Subject: Re: [PATCH v13 00/11] Support page table check on PowerPC

On Wed, 2025-02-12 at 03:13 +1100, 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, seperate
> set_pte_at()
> and set_pte_at_unchecked(), to allow for internal, uninstrumented
> mappings.

Talking to Maddy about this off-list - given that this series touches
on generic code and several architectures, would it be best to take it
through the mm tree rather than powerpc?

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