| From: |
| Alexandre Ghiti <alexghiti-AT-rivosinc.com> |
| To: |
| Ryan Roberts <ryan.roberts-AT-arm.com>, Alexander Potapenko <glider-AT-google.com>, Marco Elver <elver-AT-google.com>, Dmitry Vyukov <dvyukov-AT-google.com>, Paul Walmsley <paul.walmsley-AT-sifive.com>, Palmer Dabbelt <palmer-AT-dabbelt.com>, Albert Ou <aou-AT-eecs.berkeley.edu>, Anup Patel <anup-AT-brainfault.org>, Atish Patra <atishp-AT-atishpatra.org>, Ard Biesheuvel <ardb-AT-kernel.org>, Andrey Ryabinin <ryabinin.a.a-AT-gmail.com>, Andrey Konovalov <andreyknvl-AT-gmail.com>, Vincenzo Frascino <vincenzo.frascino-AT-arm.com>, kasan-dev-AT-googlegroups.com, linux-riscv-AT-lists.infradead.org, linux-kernel-AT-vger.kernel.org, kvm-AT-vger.kernel.org, kvm-riscv-AT-lists.infradead.org, linux-efi-AT-vger.kernel.org, linux-mm-AT-kvack.org |
| Subject: |
| [PATCH 0/5] riscv: Use READ_ONCE()/WRITE_ONCE() for pte accesses |
| Date: |
| Mon, 02 Oct 2023 17:10:26 +0200 |
| Message-ID: |
| <20231002151031.110551-1-alexghiti@rivosinc.com> |
| Cc: |
| Alexandre Ghiti <alexghiti-AT-rivosinc.com> |
| Archive-link: |
| Article |
This series is a follow-up for riscv of a recent series from Ryan [1] which
converts all direct dereferences of pte_t into a ptet_get() access.
The goal here for riscv is to use READ_ONCE()/WRITE_ONCE() for all page
table entries accesses to avoid any compiler transformation when the
hardware can concurrently modify the page tables entries (A/D bits for
example).
I went a bit further and added pud/p4d/pgd_get() helpers as such concurrent
modifications can happen too at those levels.
[1] https://lore.kernel.org/all/20230612151545.3317766-1-ryan...
Alexandre Ghiti (5):
riscv: Use WRITE_ONCE() when setting page table entries
mm: Introduce pudp/p4dp/pgdp_get() functions
riscv: mm: Only compile pgtable.c if MMU
riscv: Suffix all page table entry pointers with 'p'
riscv: Use accessors to page table entries instead of direct
dereference
arch/riscv/include/asm/kfence.h | 6 +-
arch/riscv/include/asm/kvm_host.h | 2 +-
arch/riscv/include/asm/pgalloc.h | 86 ++++++++++----------
arch/riscv/include/asm/pgtable-64.h | 26 +++---
arch/riscv/include/asm/pgtable.h | 33 ++------
arch/riscv/kernel/efi.c | 2 +-
arch/riscv/kvm/mmu.c | 44 +++++-----
arch/riscv/mm/Makefile | 3 +-
arch/riscv/mm/fault.c | 38 ++++-----
arch/riscv/mm/hugetlbpage.c | 80 +++++++++----------
arch/riscv/mm/init.c | 30 +++----
arch/riscv/mm/kasan_init.c | 119 ++++++++++++++--------------
arch/riscv/mm/pageattr.c | 74 +++++++++--------
arch/riscv/mm/pgtable.c | 71 +++++++++++------
include/linux/pgtable.h | 21 +++++
15 files changed, 334 insertions(+), 301 deletions(-)
--
2.39.2
