From: Pasha Tatashin <pasha.tatashin@soleen.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrew Donnellan <ajd@linux.ibm.com>,
linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
x86@kernel.org, linux-riscv@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, sweettea-kernel@dorminy.me,
nicholas@linux.ibm.com, christophe.leroy@csgroup.eu,
alexghiti@rivosinc.com
Subject: Re: [PATCH v17 00/12] Support page table check on PowerPC
Date: Fri, 12 Dec 2025 12:35:27 +0900 [thread overview]
Message-ID: <CA+CK2bDDZi0TR9fhAuKpxz+XJU6-rOS_iM-akU=oTb5wVoVxMQ@mail.gmail.com> (raw)
In-Reply-To: <20250925161726.2b34890070e6d8dcf8ad3ba9@linux-foundation.org>
On Fri, Sep 26, 2025 at 8:17 AM Andrew Morton <akpm@linux-foundation.org> wrote:
>
> On Fri, 26 Sep 2025 08:42:35 +1000 Andrew Donnellan <ajd@linux.ibm.com> wrote:
>
> > On Tue, 2025-09-09 at 19:13 +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 helpers or stubs must be
> > > defined or updated for all powerpc platforms. Additionally, we separate
> > > set_pte_at() and set_pte_at_unchecked(), to allow for internal, uninstrumented
> > > mappings.
> > >
> > > On some PowerPC platforms, implementing {pte,pmd,pud}_user_accessible_page()
> > > requires the address. We revert previous changes that removed the address
> > > parameter from various interfaces, and add it to some other interfaces,
> > > in order to allow this.
> > >
> > > Note that on 32 bit systems with CONFIG_KFENCE=y, you need [0] to avoid
> > > possible failures in init code (this is a code patching/static keys issue,
> > > which was discovered by a user testing this series but isn't a bug in page
> > > table check).
> > >
> > > (This series was initially written by Rohan McLure, who has left IBM and
> > > is no longer working on powerpc.)
> >
> > Is this likely to make it in in time for 6.18, or should I respin it post merge
> > window?
>
> The latter, please.
Andrew Donnelan, looks like the merge window missed again, could you
please re-send this series so we could get it into 6.20?
Thank you,
Pasha
next prev parent reply other threads:[~2025-12-12 3:36 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-09 9:13 Andrew Donnellan
2025-09-09 9:13 ` [PATCH v17 01/12] arm64/mm: Add addr parameter to __set_ptes_anysz() Andrew Donnellan
2025-09-09 9:13 ` [PATCH v17 02/12] arm64/mm: Add addr parameter to __ptep_get_and_clear_anysz() Andrew Donnellan
2025-09-09 9:13 ` [PATCH v17 03/12] mm/page_table_check: Reinstate address parameter in [__]page_table_check_pud[s]_set() Andrew Donnellan
2025-09-09 9:13 ` [PATCH v17 04/12] mm/page_table_check: Reinstate address parameter in [__]page_table_check_pmd[s]_set() Andrew Donnellan
2025-09-09 9:13 ` [PATCH v17 05/12] mm/page_table_check: Provide addr parameter to page_table_check_ptes_set() Andrew Donnellan
2025-09-09 9:13 ` [PATCH v17 06/12] mm/page_table_check: Reinstate address parameter in [__]page_table_check_pud_clear() Andrew Donnellan
2025-09-09 9:13 ` [PATCH v17 07/12] mm/page_table_check: Reinstate address parameter in [__]page_table_check_pmd_clear() Andrew Donnellan
2025-09-09 9:13 ` [PATCH v17 08/12] mm/page_table_check: Reinstate address parameter in [__]page_table_check_pte_clear() Andrew Donnellan
2025-09-09 9:13 ` [PATCH v17 09/12] mm: Provide address parameter to p{te,md,ud}_user_accessible_page() Andrew Donnellan
2025-09-09 9:13 ` [PATCH v17 10/12] powerpc: mm: Implement *_user_accessible_page() for ptes Andrew Donnellan
2025-09-09 9:13 ` [PATCH v17 11/12] powerpc: mm: Use set_pte_at_unchecked() for internal usages Andrew Donnellan
2025-09-09 9:13 ` [PATCH v17 12/12] powerpc: mm: Support page table check Andrew Donnellan
2025-09-25 22:42 ` [PATCH v17 00/12] Support page table check on PowerPC Andrew Donnellan
2025-09-25 23:17 ` Andrew Morton
2025-12-12 3:35 ` Pasha Tatashin [this message]
2025-12-12 3:37 ` Andrew Donnellan
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