From: Shaohua Li <s...@fb.com>
Now it's safe to enable write protection in userfaultfd API
Cc: Andrea Arcangeli <aarca...@redhat.com>
Cc: Pavel Emelyanov <xe...@parallels.com>
Cc: Rik van Riel <r...@redhat.com>
Cc: Kirill A. Shutemov <kir...@shutemov.name>
Cc: Mel Gorman <mgor...@suse.de>
Cc: Hugh Dickins <hu...@google.com>
Cc: Johannes Weiner <han...@cmpxchg.org>
Signed-off-by: Shaohua Li <s...@fb.com>
Signed-off-by: Andrea Arcangeli <aarca...@redhat.com>
Reviewed-by: Jerome Glisse <jgli...@redhat.com>
Signed-off-by: Peter Xu <pet...@redhat.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
