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