[PATCH v8 0/7] Support page table check

[Rohan McLure]

Anyone got time to review this one?

> On 16 Feb 2023, at 10:11 am, Rohan McLure <rmclure at linux.ibm.com> wrote:
> 
> 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
>