userfaultfd.h (e1fe27a208d565bb4f52127e7d9f4fea911e0d94) userfaultfd.h (d4083f50e021f52addd02c9f83465937f8486556)
1/*
2 * include/linux/userfaultfd.h
3 *
4 * Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org>
5 * Copyright (C) 2015 Red Hat, Inc.
6 *
7 */
8

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18 * means the userland is reading).
19 */
20#define UFFD_API ((__u64)0xAA)
21#define UFFD_API_FEATURES (UFFD_FEATURE_EVENT_FORK | \
22 UFFD_FEATURE_EVENT_REMAP | \
23 UFFD_FEATURE_EVENT_REMOVE | \
24 UFFD_FEATURE_EVENT_UNMAP | \
25 UFFD_FEATURE_MISSING_HUGETLBFS | \
1/*
2 * include/linux/userfaultfd.h
3 *
4 * Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org>
5 * Copyright (C) 2015 Red Hat, Inc.
6 *
7 */
8

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18 * means the userland is reading).
19 */
20#define UFFD_API ((__u64)0xAA)
21#define UFFD_API_FEATURES (UFFD_FEATURE_EVENT_FORK | \
22 UFFD_FEATURE_EVENT_REMAP | \
23 UFFD_FEATURE_EVENT_REMOVE | \
24 UFFD_FEATURE_EVENT_UNMAP | \
25 UFFD_FEATURE_MISSING_HUGETLBFS | \
26 UFFD_FEATURE_MISSING_SHMEM)
26 UFFD_FEATURE_MISSING_SHMEM | \
27 UFFD_FEATURE_SIGBUS | \
28 UFFD_FEATURE_THREAD_ID)
27#define UFFD_API_IOCTLS \
28 ((__u64)1 << _UFFDIO_REGISTER | \
29 (__u64)1 << _UFFDIO_UNREGISTER | \
30 (__u64)1 << _UFFDIO_API)
31#define UFFD_API_RANGE_IOCTLS \
32 ((__u64)1 << _UFFDIO_WAKE | \
33 (__u64)1 << _UFFDIO_COPY | \
34 (__u64)1 << _UFFDIO_ZEROPAGE)

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73 __u8 reserved1;
74 __u16 reserved2;
75 __u32 reserved3;
76
77 union {
78 struct {
79 __u64 flags;
80 __u64 address;
29#define UFFD_API_IOCTLS \
30 ((__u64)1 << _UFFDIO_REGISTER | \
31 (__u64)1 << _UFFDIO_UNREGISTER | \
32 (__u64)1 << _UFFDIO_API)
33#define UFFD_API_RANGE_IOCTLS \
34 ((__u64)1 << _UFFDIO_WAKE | \
35 (__u64)1 << _UFFDIO_COPY | \
36 (__u64)1 << _UFFDIO_ZEROPAGE)

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75 __u8 reserved1;
76 __u16 reserved2;
77 __u32 reserved3;
78
79 union {
80 struct {
81 __u64 flags;
82 __u64 address;
83 union {
84 __u32 ptid;
85 } feat;
81 } pagefault;
82
83 struct {
84 __u32 ufd;
85 } fork;
86
87 struct {
88 __u64 from;

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148 * kernel in the uffdio_api.features if the kernel supports
149 * it, so userland can later check if the feature flag is
150 * present in uffdio_api.features after UFFDIO_API
151 * succeeded.
152 *
153 * UFFD_FEATURE_MISSING_SHMEM works the same as
154 * UFFD_FEATURE_MISSING_HUGETLBFS, but it applies to shmem
155 * (i.e. tmpfs and other shmem based APIs).
86 } pagefault;
87
88 struct {
89 __u32 ufd;
90 } fork;
91
92 struct {
93 __u64 from;

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153 * kernel in the uffdio_api.features if the kernel supports
154 * it, so userland can later check if the feature flag is
155 * present in uffdio_api.features after UFFDIO_API
156 * succeeded.
157 *
158 * UFFD_FEATURE_MISSING_SHMEM works the same as
159 * UFFD_FEATURE_MISSING_HUGETLBFS, but it applies to shmem
160 * (i.e. tmpfs and other shmem based APIs).
161 *
162 * UFFD_FEATURE_SIGBUS feature means no page-fault
163 * (UFFD_EVENT_PAGEFAULT) event will be delivered, instead
164 * a SIGBUS signal will be sent to the faulting process.
165 *
166 * UFFD_FEATURE_THREAD_ID pid of the page faulted task_struct will
167 * be returned, if feature is not requested 0 will be returned.
156 */
157#define UFFD_FEATURE_PAGEFAULT_FLAG_WP (1<<0)
158#define UFFD_FEATURE_EVENT_FORK (1<<1)
159#define UFFD_FEATURE_EVENT_REMAP (1<<2)
160#define UFFD_FEATURE_EVENT_REMOVE (1<<3)
161#define UFFD_FEATURE_MISSING_HUGETLBFS (1<<4)
162#define UFFD_FEATURE_MISSING_SHMEM (1<<5)
163#define UFFD_FEATURE_EVENT_UNMAP (1<<6)
168 */
169#define UFFD_FEATURE_PAGEFAULT_FLAG_WP (1<<0)
170#define UFFD_FEATURE_EVENT_FORK (1<<1)
171#define UFFD_FEATURE_EVENT_REMAP (1<<2)
172#define UFFD_FEATURE_EVENT_REMOVE (1<<3)
173#define UFFD_FEATURE_MISSING_HUGETLBFS (1<<4)
174#define UFFD_FEATURE_MISSING_SHMEM (1<<5)
175#define UFFD_FEATURE_EVENT_UNMAP (1<<6)
176#define UFFD_FEATURE_SIGBUS (1<<7)
177#define UFFD_FEATURE_THREAD_ID (1<<8)
164 __u64 features;
165
166 __u64 ioctls;
167};
168
169struct uffdio_range {
170 __u64 start;
171 __u64 len;

--- 48 unchanged lines hidden --- 		178 __u64 features;
179
180 __u64 ioctls;
181};
182
183struct uffdio_range {
184 __u64 start;
185 __u64 len;

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