mm/userfaultfd: fix uffd-wp handling for THP migration entries
Looks like what we fixed for hugetlb in commit 44f86392 ("mm/hugetlb: fix uffd-wp handling for migration entries in hugetlb_change_protection()") similarly applies to THP. Setting/clearing uffd-wp on THP migration entries is not implemented properly. Further, while removing migration PMDs considers the uffd-wp bit, inserting migration PMDs does not consider the uffd-wp bit. We have to set/clear independently of the migration entry type in change_huge_pmd() and properly copy the uffd-wp bit in set_pmd_migration_entry(). Verified using a simple reproducer that triggers migration of a THP, that the set_pmd_migration_entry() no longer loses the uffd-wp bit. Link: https://lkml.kernel.org/r/20230405160236.587705-2-david@redhat.com Fixes: f45ec5ff ("userfaultfd: wp: support swap and page migration") Signed-off-by:David Hildenbrand <david@redhat.com> Reviewed-by:
Peter Xu <peterx@redhat.com> Cc: <stable@vger.kernel.org> Cc: Muhammad Usama Anjum <usama.anjum@collabora.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org>
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