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

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Message-Id: <20250313154757.79dc20b347a0bee16f4fbd10@linux-foundation.org>
Date: Thu, 13 Mar 2025 15:47:57 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Andrew Donnellan <ajd@...ux.ibm.com>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
 pasha.tatashin@...een.com, maddy@...ux.ibm.com, 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 Thu, 13 Mar 2025 13:54:39 +1100 Andrew Donnellan <ajd@...ux.ibm.com> wrote:

> 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?

Sure, I can do that.

Are the rest of the ppc team OK with these changes?  I'm not seeing
much acking from the usual suspects?