1 files changed, 10 insertions, 1 deletions

diff --git a/include/uapi/linux/userfaultfd.h b/include/uapi/linux/userfaultfd.h
index c8953c84fdcc..79a85e5bd388 100644
--- a/include/uapi/linux/userfaultfd.h
+++ b/include/uapi/linux/userfaultfd.h
@@ -18,7 +18,8 @@
  * means the userland is reading).
  */
 #define UFFD_API ((__u64)0xAA)
-#define UFFD_API_FEATURES (UFFD_FEATURE_EVENT_FORK)
+#define UFFD_API_FEATURES (UFFD_FEATURE_EVENT_FORK |        \
+                           UFFD_FEATURE_EVENT_REMAP)
 #define UFFD_API_IOCTLS                         \
         ((__u64)1 << _UFFDIO_REGISTER |         \
          (__u64)1 << _UFFDIO_UNREGISTER |       \
@@ -77,6 +78,12 @@ struct uffd_msg {
                 } fork;
 
                 struct {
+                        __u64   from;
+                        __u64   to;
+                        __u64   len;
+                } remap;
+
+                struct {
                         /* unused reserved fields */
                         __u64   reserved1;
                         __u64   reserved2;
@@ -90,6 +97,7 @@ struct uffd_msg {
  */
 #define UFFD_EVENT_PAGEFAULT    0x12
 #define UFFD_EVENT_FORK         0x13
+#define UFFD_EVENT_REMAP        0x14
 
 /* flags for UFFD_EVENT_PAGEFAULT */
 #define UFFD_PAGEFAULT_FLAG_WRITE       (1<<0)  /* If this was a write fault */
@@ -110,6 +118,7 @@ struct uffdio_api {
          */
 #define UFFD_FEATURE_PAGEFAULT_FLAG_WP          (1<<0)
 #define UFFD_FEATURE_EVENT_FORK                 (1<<1)
+#define UFFD_FEATURE_EVENT_REMAP                (1<<2)
         __u64 features;
 
         __u64 ioctls;