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| author | Paolo Bonzini <pbonzini@redhat.com> | 2022-09-01 19:21:27 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-09-01 19:21:27 -0400 |
| commit | 29250ba51bc1cbe8a87e923f76978b87c3247a8c (patch) | |
| tree | b6afc83e580ae3b746aa530434f56bb6fb80cc8b /mm/userfaultfd.c | |
| parent | 35906d23cf036857738d49b0d9388376145dc017 (diff) | |
| parent | ca922fecda6caa5162409406dc3b663062d75089 (diff) | |
Merge tag 'kvm-s390-master-6.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD
PCI interpretation compile fixes
Diffstat (limited to 'mm/userfaultfd.c')
| -rw-r--r-- | mm/userfaultfd.c | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index 07d3befc80e4..7327b2573f7c 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -703,14 +703,29 @@ ssize_t mcopy_continue(struct mm_struct *dst_mm, unsigned long start, mmap_changing, 0); } +void uffd_wp_range(struct mm_struct *dst_mm, struct vm_area_struct *dst_vma, + unsigned long start, unsigned long len, bool enable_wp) +{ + struct mmu_gather tlb; + pgprot_t newprot; + + if (enable_wp) + newprot = vm_get_page_prot(dst_vma->vm_flags & ~(VM_WRITE)); + else + newprot = vm_get_page_prot(dst_vma->vm_flags); + + tlb_gather_mmu(&tlb, dst_mm); + change_protection(&tlb, dst_vma, start, start + len, newprot, + enable_wp ? MM_CP_UFFD_WP : MM_CP_UFFD_WP_RESOLVE); + tlb_finish_mmu(&tlb); +} + int mwriteprotect_range(struct mm_struct *dst_mm, unsigned long start, unsigned long len, bool enable_wp, atomic_t *mmap_changing) { struct vm_area_struct *dst_vma; unsigned long page_mask; - struct mmu_gather tlb; - pgprot_t newprot; int err; /* @@ -750,15 +765,7 @@ int mwriteprotect_range(struct mm_struct *dst_mm, unsigned long start, goto out_unlock; } - if (enable_wp) - newprot = vm_get_page_prot(dst_vma->vm_flags & ~(VM_WRITE)); - else - newprot = vm_get_page_prot(dst_vma->vm_flags); - - tlb_gather_mmu(&tlb, dst_mm); - change_protection(&tlb, dst_vma, start, start + len, newprot, - enable_wp ? MM_CP_UFFD_WP : MM_CP_UFFD_WP_RESOLVE); - tlb_finish_mmu(&tlb); + uffd_wp_range(dst_mm, dst_vma, start, len, enable_wp); err = 0; out_unlock: |