[PATCH v8 0/7] Support page table check

[Rohan McLure]

Support the page table check sanitiser on all PowerPC platforms. This
sanitiser works by serialising assignments, reassignments and clears of
page table entries at each level in order to ensure that anonymous
mappings have at most one writable consumer, and likewise that
file-backed mappings are not simultaneously also anonymous mappings.

In order to support this infrastructure, a number of stubs must be
defined for all powerpc platforms. Additionally, seperate set_pte_at
and set_pte, to allow for internal, uninstrumented mappings.

v8:
 * Fix linux/page_table_check.h include in asm/pgtable.h breaking
   32-bit.

v7:
 * Remove use of extern in set_pte prototypes
 * Clean up pmdp_collapse_flush macro
 * Replace set_pte_at with static inline function
 * Fix commit message for patch 7
Link: https://lore.kernel.org/linuxppc-dev/20230215020155.1969194-1-rmclure@linux.ibm.com/

v6:
 * Support huge pages and p{m,u}d accounting.
 * Remove instrumentation from set_pte from kernel internal pages.
 * 64s: Implement pmdp_collapse_flush in terms of __pmdp_collapse_flush
   as access to the mm_struct * is required.
Link: https://lore.kernel.org/linuxppc-dev/20230214015939.1853438-1-rmclure@linux.ibm.com/

v5:
Link: https://lore.kernel.org/linuxppc-dev/20221118002146.25979-1-rmclure@linux.ibm.com/

Rohan McLure (7):
  powerpc: mm: Separate set_pte, set_pte_at for internal, external use
  powerpc/64s: mm: Introduce __pmdp_collapse_flush with mm_struct
    argument
  powerpc: mm: Replace p{u,m,4}d_is_leaf with p{u,m,4}_leaf
  powerpc: mm: Implement p{m,u,4}d_leaf on all platforms
  powerpc: mm: Add common pud_pfn stub for all platforms
  powerpc: mm: Add p{te,md,ud}_user_accessible_page helpers
  powerpc: mm: Support page table check

 arch/powerpc/Kconfig                         |  1 +
 arch/powerpc/include/asm/book3s/32/pgtable.h | 17 +++-
 arch/powerpc/include/asm/book3s/64/pgtable.h | 85 +++++++++++++-------
 arch/powerpc/include/asm/book3s/pgtable.h    |  3 +-
 arch/powerpc/include/asm/nohash/32/pgtable.h | 12 ++-
 arch/powerpc/include/asm/nohash/64/pgtable.h | 24 +++++-
 arch/powerpc/include/asm/nohash/pgtable.h    |  9 ++-
 arch/powerpc/include/asm/pgtable.h           | 60 +++++++++-----
 arch/powerpc/kvm/book3s_64_mmu_radix.c       | 12 +--
 arch/powerpc/mm/book3s64/hash_pgtable.c      |  2 +-
 arch/powerpc/mm/book3s64/pgtable.c           | 16 ++--
 arch/powerpc/mm/book3s64/radix_pgtable.c     | 24 +++---
 arch/powerpc/mm/nohash/book3e_pgtable.c      |  2 +-
 arch/powerpc/mm/pgtable.c                    |  9 +--
 arch/powerpc/mm/pgtable_32.c                 |  2 +-
 arch/powerpc/mm/pgtable_64.c                 |  6 +-
 arch/powerpc/xmon/xmon.c                     |  6 +-
 17 files changed, 197 insertions(+), 93 deletions(-)

-- 
2.37.2