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hugetlb/userfaultfd: Handle UFFDIO_WRITEPROTECT
This starts from passing cp_flags into hugetlb_change_protection() so hugetlb will be able to handle MM_CP_UFFD_WP[_RESOLVE] requests. huge_pte_clear_uffd_wp() is introduced to handle the case where the UFFDIO_WRITEPROTECT is requested upon migrating huge page entries. Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by: Peter Xu <peterx@redhat.com>
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