[Qemu-devel] [PATCH v10 01/10] userfault: update kernel header for UFFD_FEATURE_*

[Alexey Perevalov]

This commit adds modification for UFFD_FEATURE_SIGBUS and
UFFD_FEATURE_THREAD_ID.

Signed-off-by: Alexey Perevalov <address@hidden>
---
 linux-headers/linux/userfaultfd.h | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/linux-headers/linux/userfaultfd.h 
b/linux-headers/linux/userfaultfd.h
index 9701772..b43cf0d 100644
--- a/linux-headers/linux/userfaultfd.h
+++ b/linux-headers/linux/userfaultfd.h
@@ -23,7 +23,9 @@
                           UFFD_FEATURE_EVENT_REMOVE |  \
                           UFFD_FEATURE_EVENT_UNMAP |           \
                           UFFD_FEATURE_MISSING_HUGETLBFS |     \
-                          UFFD_FEATURE_MISSING_SHMEM)
+                          UFFD_FEATURE_MISSING_SHMEM |         \
+                          UFFD_FEATURE_SIGBUS |                \
+                          UFFD_FEATURE_THREAD_ID)
 #define UFFD_API_IOCTLS                                \
        ((__u64)1 << _UFFDIO_REGISTER |         \
         (__u64)1 << _UFFDIO_UNREGISTER |       \
@@ -78,6 +80,9 @@ struct uffd_msg {
                struct {
                        __u64   flags;
                        __u64   address;
+                       union {
+                               __u32 ptid;
+                       } feat;
                } pagefault;
 
                struct {
@@ -153,6 +158,13 @@ struct uffdio_api {
         * UFFD_FEATURE_MISSING_SHMEM works the same as
         * UFFD_FEATURE_MISSING_HUGETLBFS, but it applies to shmem
         * (i.e. tmpfs and other shmem based APIs).
+        *
+        * UFFD_FEATURE_SIGBUS feature means no page-fault
+        * (UFFD_EVENT_PAGEFAULT) event will be delivered, instead
+        * a SIGBUS signal will be sent to the faulting process.
+        *
+        * UFFD_FEATURE_THREAD_ID pid of the page faulted task_struct will
+        * be returned, if feature is not requested 0 will be returned.
         */
 #define UFFD_FEATURE_PAGEFAULT_FLAG_WP         (1<<0)
 #define UFFD_FEATURE_EVENT_FORK                        (1<<1)
@@ -161,6 +173,8 @@ struct uffdio_api {
 #define UFFD_FEATURE_MISSING_HUGETLBFS         (1<<4)
 #define UFFD_FEATURE_MISSING_SHMEM             (1<<5)
 #define UFFD_FEATURE_EVENT_UNMAP               (1<<6)
+#define UFFD_FEATURE_SIGBUS                    (1<<7)
+#define UFFD_FEATURE_THREAD_ID                 (1<<8)
        __u64 features;
 
        __u64 ioctls;
-- 
1.9.1