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Message-Id: <20250905103651.489197-1-zhangchunyan@iscas.ac.cn>
Date: Fri, 5 Sep 2025 18:36:46 +0800
From: Chunyan Zhang <zhangchunyan@...as.ac.cn>
To: linux-riscv@...ts.infradead.org,
linux-mm@...ck.org,
linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Alexandre Ghiti <alex@...ti.fr>,
Andrew Morton <akpm@...ux-foundation.org>,
Deepak Gupta <debug@...osinc.com>,
Ved Shanbhogue <ved@...osinc.com>,
Peter Xu <peterx@...hat.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
Arnd Bergmann <arnd@...db.de>,
Jan Kara <jack@...e.cz>,
Axel Rasmussen <axelrasmussen@...gle.com>,
Wei Xu <weixugc@...gle.com>,
David Hildenbrand <david@...hat.com>,
Chunyan Zhang <zhang.lyra@...il.com>
Subject: [PATCH v9 0/5] riscv: mm: Add soft-dirty and uffd-wp support
This patchset adds support for Svrsw60t59b [1] extension which is ratified now,
also soft dirty and userfaultfd write protect tracking for RISC-V.
This patchset has been tested with kselftest mm suite in which soft-dirty,
madv_populate, test_unmerge_uffd_wp, and uffd-unit-tests run and pass,
and no regressions are observed in any of the other tests.
This patchset applies on top of v6.17-rc4.
V9:
- Add pte_soft_dirty/uffd_wp_available() API to allow dynamically checking
if the PTE bit is available for the platform on which the kernel is running.
V8: (https://lore.kernel.org/all/20250619065232.1786470-1-zhangchunyan@iscas.ac.cn/)
- Rebase on v6.16-rc1;
- Add dependencies to MMU && 64BIT for RISCV_ISA_SVRSW60T59B;
- Use 'Svrsw60t59b' instead of 'SVRSW60T59B' in Kconfig help paragraph;
- Add Alex's Reviewed-by tag in patch 1.
V7: (https://lore.kernel.org/all/20250409095320.224100-1-zhangchunyan@iscas.ac.cn/)
- Add Svrsw60t59b [1] extension support;
- Have soft-dirty and uffd-wp depending on the Svrsw60t59b extension to
avoid crashes for the hardware which don't have this extension.
V6:
- Changes to use bits 59-60 which are supported by extension Svrsw60t59b
for soft dirty and userfaultfd write protect tracking.
V5:
- Fixed typos and corrected some words in Kconfig and commit message;
- Removed pte_wrprotect() from pte_swp_mkuffd_wp(), this is a copy-paste
error;
- Added Alex's Reviewed-by tag in patch 2.
V4:
- Added bit(4) descriptions into "Format of swap PTE".
V3:
- Fixed the issue reported by kernel test irobot <lkp@...el.com>.
V1 -> V2:
- Add uffd-wp supported;
- Make soft-dirty uffd-wp and devmap mutually exclusive which all use
the same PTE bit;
- Add test results of CRIU in the cover-letter.
[1] https://github.com/riscv-non-isa/riscv-iommu/pull/543
Chunyan Zhang (5):
mm: softdirty: Add pte_soft_dirty_available()
mm: uffd_wp: Add pte_uffd_wp_available()
riscv: Add RISC-V Svrsw60t59b extension support
riscv: mm: Add soft-dirty page tracking support
riscv: mm: Add uffd write-protect support
arch/riscv/Kconfig | 16 +++
arch/riscv/include/asm/hwcap.h | 1 +
arch/riscv/include/asm/pgtable-bits.h | 37 +++++++
arch/riscv/include/asm/pgtable.h | 140 +++++++++++++++++++++++++-
arch/riscv/kernel/cpufeature.c | 1 +
fs/proc/task_mmu.c | 12 ++-
fs/userfaultfd.c | 25 +++--
include/asm-generic/pgtable_uffd.h | 12 +++
include/linux/mm_inline.h | 6 +-
include/linux/pgtable.h | 10 ++
include/linux/userfaultfd_k.h | 44 +++++---
mm/debug_vm_pgtable.c | 9 +-
mm/huge_memory.c | 13 +--
mm/internal.h | 2 +-
mm/memory.c | 6 +-
mm/mremap.c | 13 +--
mm/userfaultfd.c | 12 +--
17 files changed, 302 insertions(+), 57 deletions(-)
--
2.34.1
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