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    SubjectRe: [PATCH v3 22/28] userfaultfd: wp: enabled write protection in userfaultfd API
    On Wed, Mar 20, 2019 at 10:06:36AM +0800, Peter Xu wrote:
    > From: Shaohua Li <shli@fb.com>
    >
    > Now it's safe to enable write protection in userfaultfd API
    >
    > Cc: Andrea Arcangeli <aarcange@redhat.com>
    > Cc: Pavel Emelyanov <xemul@parallels.com>
    > Cc: Rik van Riel <riel@redhat.com>
    > Cc: Kirill A. Shutemov <kirill@shutemov.name>
    > Cc: Mel Gorman <mgorman@suse.de>
    > Cc: Hugh Dickins <hughd@google.com>
    > Cc: Johannes Weiner <hannes@cmpxchg.org>
    > Signed-off-by: Shaohua Li <shli@fb.com>
    > Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
    > Reviewed-by: Jerome Glisse <jglisse@redhat.com>
    > Signed-off-by: Peter Xu <peterx@redhat.com>

    Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>

    > ---
    > include/uapi/linux/userfaultfd.h | 6 ++++--
    > 1 file changed, 4 insertions(+), 2 deletions(-)
    >
    > diff --git a/include/uapi/linux/userfaultfd.h b/include/uapi/linux/userfaultfd.h
    > index 95c4a160e5f8..e7e98bde221f 100644
    > --- a/include/uapi/linux/userfaultfd.h
    > +++ b/include/uapi/linux/userfaultfd.h
    > @@ -19,7 +19,8 @@
    > * means the userland is reading).
    > */
    > #define UFFD_API ((__u64)0xAA)
    > -#define UFFD_API_FEATURES (UFFD_FEATURE_EVENT_FORK | \
    > +#define UFFD_API_FEATURES (UFFD_FEATURE_PAGEFAULT_FLAG_WP | \
    > + UFFD_FEATURE_EVENT_FORK | \
    > UFFD_FEATURE_EVENT_REMAP | \
    > UFFD_FEATURE_EVENT_REMOVE | \
    > UFFD_FEATURE_EVENT_UNMAP | \
    > @@ -34,7 +35,8 @@
    > #define UFFD_API_RANGE_IOCTLS \
    > ((__u64)1 << _UFFDIO_WAKE | \
    > (__u64)1 << _UFFDIO_COPY | \
    > - (__u64)1 << _UFFDIO_ZEROPAGE)
    > + (__u64)1 << _UFFDIO_ZEROPAGE | \
    > + (__u64)1 << _UFFDIO_WRITEPROTECT)
    > #define UFFD_API_RANGE_IOCTLS_BASIC \
    > ((__u64)1 << _UFFDIO_WAKE | \
    > (__u64)1 << _UFFDIO_COPY)
    > --
    > 2.17.1
    >

    --
    Sincerely yours,
    Mike.

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