[PATCH -next v6 0/6]mm: page_table_check: add support on arm64 and riscv

From: Tong Tiangen
Date: Tue Apr 26 2022 - 03:52:14 EST

Page table check performs extra verifications at the time when new
pages become accessible from the userspace by getting their page
table entries (PTEs PMDs etc.) added into the table. It is supported
on X86[1].

This patchset made some simple changes and make it easier to support
new architecture, then we support this feature on ARM64 and RISCV.


v5 -> v6:
According to Anshuman's suggestion, optimized partial implementation and
commit message:
1. Remove redundant IS_ENABLED() in ptep_clear().
2. Remove redundant __HAVE_ARCH_PTEP_CLEAR usage in pgtable.h.
3. Remove redundant __ptep_get_and_clear() on arm64 and riscv.

v4 -> v5:
According to Anshuman's suggestion, using PxD_SIZE instead of
PxD_PAGE_SIZE in mm/page_table_check.c and it is checked by Pasha.

v3 -> v4:
Adapt to next-20220414

v2 -> v3:
Modify ptep_clear() in include/linux/pgtable.h, using IS_ENABLED according
to the suggestions of Pasha.

v1 -> v2:
1. Fix arm64's pte/pmd/pud_user_accessible_page() according to the
suggestions of Catalin.
2. Also fix riscv's pte_pmd_pud_user_accessible_page().

Kefeng Wang (2):
mm: page_table_check: move pxx_user_accessible_page into x86

Tong Tiangen (4):
mm: page_table_check: using PxD_SIZE instead of PxD_PAGE_SIZE
mm: page_table_check: add hooks to public helpers
mm: remove __HAVE_ARCH_PTEP_CLEAR in pgtable.h

arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/pgtable.h | 59 +++++++++++++++++++++++---
arch/riscv/Kconfig | 1 +
arch/riscv/include/asm/pgtable.h | 71 +++++++++++++++++++++++++++++---
arch/x86/include/asm/pgtable.h | 27 +++++++-----
include/linux/pgtable.h | 21 ++++++----
mm/page_table_check.c | 25 ++---------
7 files changed, 155 insertions(+), 50 deletions(-)