linux-kernel - [PATCH 0/5] riscv: Use READ_ONCE()/WRITE

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Date:   Mon,  2 Oct 2023 17:10:26 +0200
From:   Alexandre Ghiti <alexghiti@...osinc.com>
To:     Ryan Roberts <ryan.roberts@....com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        kasan-dev@...glegroups.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-efi@...r.kernel.org,
        linux-mm@...ck.org
Cc:     Alexandre Ghiti <alexghiti@...osinc.com>
Subject: [PATCH 0/5] riscv: Use READ_ONCE()/WRITE_ONCE() for pte accesses

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.roberts@arm.com/

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