[PATCH v8 0/7] Support page table check

[Michael Ellerman]

Rohan McLure <rmclure at linux.ibm.com> writes:
> Anyone got time to review this one?

I was planning to pick it up, but it's going to conflict badly with the
set_ptes() series:

  https://lore.kernel.org/all/20230315051444.3229621-1-willy@infradead.org/

I thought that series was likely to go in soon, but I see it's still not
in linux-next.

Hopefully there'll be a v5 of that series soon and we can try and work
out the conflicts. I might need to create a topic branch, or have this
series go via -mm.

cheers


>> 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
>>