From: Muhammad Usama Anjum <usama.anjum@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Ryan Roberts <ryan.roberts@arm.com>,
Ard Biesheuvel <ardb@kernel.org>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
Andrey Ryabinin <ryabinin.a.a@gmail.com>,
Alexander Potapenko <glider@google.com>,
Andrey Konovalov <andreyknvl@gmail.com>,
Dmitry Vyukov <dvyukov@google.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R. Howlett" <liam@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org,
kasan-dev@googlegroups.com, linux-mm@kvack.org,
Muhammad Usama Anjum <usama.anjum@arm.com>
Subject: [PATCH v2 0/6] arm64: distinguish HW PTE pointers from SW PTE value pointers
Date: Tue, 22 Sep 2026 18:31:55 +0100 [thread overview]
Message-ID: <20260922-pte0_arm-v2-0-a3f1ddff0a8a@arm.com> (raw)
Hi,
The generic series introduces hw_pte_t for HW PTEs, while SW PTE values
use pte_t. This series enables the distinct type on arm64 so the
compiler can distinguish HW PTE pointers (hw_pte_t *) from SW PTE value
pointers (pte_t *).
The conversion updates HW PTE pointers and accessors, including atomic
updates, fixmap, and early page-table construction, before selecting
ARCH_HAS_HW_PTE_T. Higher-level entry types remain out of scope, and
shared helpers retain explicit casts.
The linked generic series is a prerequisite. Its cover contains the
Coccinelle script used for most pointer conversions; the remaining sites
were converted by hand.
Testing:
Testing was performed with and without the series on both x86_64 and
arm64. KUnit and the MM kselftests produced matching before-and-after
results problems or regressions. Fastpath performance testing was also
completed on arm64. No regression was found.
Link: https://lore.kernel.org/all/20260922-pte0-v3-0-5670b8cb9059@arm.com
Signed-off-by: Muhammad Usama Anjum <usama.anjum@arm.com>
---
Changes in v2:
- Move hw_pte_val() to the generic series and drop an unrelated comment
change from the atomic-access patch.
- Use raw PTE values instead of generic HW/SW conversion helpers.
- Drop a comment and add testing resutls in the cover letter
- Add Reviewed-by tags.
- Link to v1: https://patch.msgid.link/20260914-pte0_arm-v1-0-bb53b663e396@arm.com
To: Catalin Marinas <catalin.marinas@arm.com>
To: Will Deacon <will@kernel.org>
To: Mark Rutland <mark.rutland@arm.com>
To: Ard Biesheuvel <ardb@kernel.org>
To: Ilias Apalodimas <ilias.apalodimas@linaro.org>
To: Andrey Ryabinin <ryabinin.a.a@gmail.com>
To: Alexander Potapenko <glider@google.com>
To: Andrey Konovalov <andreyknvl@gmail.com>
To: Dmitry Vyukov <dvyukov@google.com>
To: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: usama.anjum@arm.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-efi@vger.kernel.org
Cc: kasan-dev@googlegroups.com
---
Muhammad Usama Anjum (6):
arm64: use hw_pte_t for HW PTE pointers
arm64: use hw_pte_val for HW PTE atomics
arm64: use hw_pte_val for HW PTE loads and stores
arm64: use hw_pte_t for fixmap HW PTEs
arm64: use HW PTE accessors in early map_range()
arm64: enable a distinct type for HW PTEs
arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/hugetlb.h | 19 ++++----
arch/arm64/include/asm/pgalloc.h | 2 +-
arch/arm64/include/asm/pgtable.h | 157 ++++++++++++++++++++++++++++++++++------------------------------
arch/arm64/include/asm/vmalloc.h | 2 +-
arch/arm64/kernel/efi.c | 3 +-
arch/arm64/kernel/pi/map_kernel.c | 4 +-
arch/arm64/kernel/pi/map_range.c | 20 +++++----
arch/arm64/kernel/pi/pi.h | 3 +-
arch/arm64/mm/contpte.c | 49 ++++++++++----------
arch/arm64/mm/fault.c | 7 +--
arch/arm64/mm/fixmap.c | 8 ++--
arch/arm64/mm/hugetlbpage.c | 48 ++++++++++----------
arch/arm64/mm/kasan_init.c | 4 +-
arch/arm64/mm/mmu.c | 46 +++++++++++--------
arch/arm64/mm/pageattr.c | 4 +-
arch/arm64/mm/trans_pgd.c | 4 +-
17 files changed, 207 insertions(+), 174 deletions(-)
---
base-commit: ead700ca770c82167af32622cf8b68c9f87c3c7c
change-id: 20260911-pte0_arm-f1b7df7c0b51
prerequisite-message-id: 20260922-pte0-v3-0-5670b8cb9059@arm.com
prerequisite-patch-id: 0114fcc6ab0dbb739b5bb6fc0fe6b1c8f1fa37a1
prerequisite-patch-id: 09fcf65970074620dd3a9cce6850b901beb01db8
prerequisite-patch-id: 9b2fdab97c99effabb85526fa7f141c933b3aa23
prerequisite-patch-id: 1aa309a26d98a1e93a54742705a03567ee93be71
prerequisite-patch-id: ebe32f52c95ad0542982f0b37798d209595e25e1
prerequisite-patch-id: 22950028c3d2060de8acd3fe4a73d755b18215e3
prerequisite-patch-id: a60d249f52d092524176851b2570d7245bb24434
prerequisite-patch-id: 81ebd1378e25d40a1771b53973abcc4defa87535
prerequisite-patch-id: d982f2b00c5eddb2459f69008a73e4f4ae4d8299
Best regards,
--
Usama
next reply other threads:[~2026-09-22 17:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-22 17:31 Muhammad Usama Anjum [this message]
2026-09-22 17:31 ` [PATCH v2 1/6] arm64: use hw_pte_t for HW PTE pointers Muhammad Usama Anjum
2026-09-22 17:31 ` [PATCH v2 2/6] arm64: use hw_pte_val for HW PTE atomics Muhammad Usama Anjum
2026-09-22 17:31 ` [PATCH v2 3/6] arm64: use hw_pte_val for HW PTE loads and stores Muhammad Usama Anjum
2026-09-22 17:31 ` [PATCH v2 4/6] arm64: use hw_pte_t for fixmap HW PTEs Muhammad Usama Anjum
2026-09-22 17:32 ` [PATCH v2 5/6] arm64: use HW PTE accessors in early map_range() Muhammad Usama Anjum
2026-09-22 17:32 ` [PATCH v2 6/6] arm64: enable a distinct type for HW PTEs Muhammad Usama Anjum
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