This series tries to disable huge pmd unshare of hugetlbfs backed memory for uffd-wp. Although uffd-wp of hugetlbfs is still during rfc stage, the idea of this series may be needed for multiple tasks (Axel's uffd minor fault series, and Mike's soft dirty series), so I picked it out from the larger series.
References works: Uffd shmem+hugetlbfs rfc: https://lore.kernel.org/lkml/20210115170907.24498-1-pet...@redhat.com/ Uffd minor mode for hugetlbfs: https://lore.kernel.org/lkml/20210212215403.3457686-1-axelrasmus...@google.com/ Soft dirty for hugetlbfs: https://lore.kernel.org/lkml/20210211000322.159437-1-mike.krav...@oracle.com/ Please review, thanks. Peter Xu (4): hugetlb: Pass vma into huge_pte_alloc() and huge_pmd_share() hugetlb/userfaultfd: Forbid huge pmd sharing when uffd enabled mm/hugetlb: Move flush_hugetlb_tlb_range() into hugetlb.h hugetlb/userfaultfd: Unshare all pmds for hugetlbfs when register wp arch/arm64/mm/hugetlbpage.c | 7 ++--- arch/ia64/mm/hugetlbpage.c | 3 +- arch/mips/mm/hugetlbpage.c | 4 +-- arch/parisc/mm/hugetlbpage.c | 2 +- arch/powerpc/mm/hugetlbpage.c | 3 +- arch/s390/mm/hugetlbpage.c | 2 +- arch/sh/mm/hugetlbpage.c | 2 +- arch/sparc/mm/hugetlbpage.c | 1 + fs/userfaultfd.c | 57 +++++++++++++++++++++++++++++++++++ include/linux/hugetlb.h | 15 +++++++-- include/linux/userfaultfd_k.h | 9 ++++++ mm/hugetlb.c | 43 +++++++++++++------------- mm/userfaultfd.c | 2 +- 13 files changed, 115 insertions(+), 35 deletions(-) -- 2.26.2
