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From: Andrew Morton <akpm@linux-foundation.org>
To: Andrew Donnellan <ajd@linux.ibm.com>
Cc: 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, pasha.tatashin@soleen.com,
	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: Thu, 25 Sep 2025 16:17:26 -0700	[thread overview]
Message-ID: <20250925161726.2b34890070e6d8dcf8ad3ba9@linux-foundation.org> (raw)
In-Reply-To: <336c0402c59363956d0c4eefc1b8a059e1fcc8e4.camel@linux.ibm.com>

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.

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  reply	other threads:[~2025-09-25 23:17 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-09  9:13 [PATCH v17 00/12] Support page table check on PowerPC 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 [this message]
2025-12-12  3:35     ` Pasha Tatashin
2025-12-12  3:37       ` Andrew Donnellan

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