16f52b16cSGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 21038628dSAndrea Arcangeli /* 31038628dSAndrea Arcangeli * include/linux/userfaultfd.h 41038628dSAndrea Arcangeli * 51038628dSAndrea Arcangeli * Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org> 61038628dSAndrea Arcangeli * Copyright (C) 2015 Red Hat, Inc. 71038628dSAndrea Arcangeli * 81038628dSAndrea Arcangeli */ 91038628dSAndrea Arcangeli 101038628dSAndrea Arcangeli #ifndef _LINUX_USERFAULTFD_H 111038628dSAndrea Arcangeli #define _LINUX_USERFAULTFD_H 121038628dSAndrea Arcangeli 131038628dSAndrea Arcangeli #include <linux/types.h> 141038628dSAndrea Arcangeli 152d5de004SAxel Rasmussen /* ioctls for /dev/userfaultfd */ 162d5de004SAxel Rasmussen #define USERFAULTFD_IOC 0xAA 172d5de004SAxel Rasmussen #define USERFAULTFD_IOC_NEW _IO(USERFAULTFD_IOC, 0x00) 182d5de004SAxel Rasmussen 19e067eba5SAndrea Arcangeli /* 20e067eba5SAndrea Arcangeli * If the UFFDIO_API is upgraded someday, the UFFDIO_UNREGISTER and 21e067eba5SAndrea Arcangeli * UFFDIO_WAKE ioctls should be defined as _IOW and not as _IOR. In 22e067eba5SAndrea Arcangeli * userfaultfd.h we assumed the kernel was reading (instead _IOC_READ 23e067eba5SAndrea Arcangeli * means the userland is reading). 24e067eba5SAndrea Arcangeli */ 251038628dSAndrea Arcangeli #define UFFD_API ((__u64)0xAA) 267677f7fdSAxel Rasmussen #define UFFD_API_REGISTER_MODES (UFFDIO_REGISTER_MODE_MISSING | \ 277677f7fdSAxel Rasmussen UFFDIO_REGISTER_MODE_WP | \ 287677f7fdSAxel Rasmussen UFFDIO_REGISTER_MODE_MINOR) 29e06f1e1dSShaohua Li #define UFFD_API_FEATURES (UFFD_FEATURE_PAGEFAULT_FLAG_WP | \ 30e06f1e1dSShaohua Li UFFD_FEATURE_EVENT_FORK | \ 3105ce7724SPavel Emelyanov UFFD_FEATURE_EVENT_REMAP | \ 32d811914dSMike Rapoport UFFD_FEATURE_EVENT_REMOVE | \ 33897ab3e0SMike Rapoport UFFD_FEATURE_EVENT_UNMAP | \ 3447dd9245SAndrea Arcangeli UFFD_FEATURE_MISSING_HUGETLBFS | \ 352d6d6f5aSPrakash Sangappa UFFD_FEATURE_MISSING_SHMEM | \ 369d4ac934SAlexey Perevalov UFFD_FEATURE_SIGBUS | \ 377677f7fdSAxel Rasmussen UFFD_FEATURE_THREAD_ID | \ 38964ab004SAxel Rasmussen UFFD_FEATURE_MINOR_HUGETLBFS | \ 39824ddc60SNadav Amit UFFD_FEATURE_MINOR_SHMEM | \ 40b1f9e876SPeter Xu UFFD_FEATURE_EXACT_ADDRESS | \ 412bad466cSPeter Xu UFFD_FEATURE_WP_HUGETLBFS_SHMEM | \ 422bad466cSPeter Xu UFFD_FEATURE_WP_UNPOPULATED) 431038628dSAndrea Arcangeli #define UFFD_API_IOCTLS \ 441038628dSAndrea Arcangeli ((__u64)1 << _UFFDIO_REGISTER | \ 451038628dSAndrea Arcangeli (__u64)1 << _UFFDIO_UNREGISTER | \ 461038628dSAndrea Arcangeli (__u64)1 << _UFFDIO_API) 471038628dSAndrea Arcangeli #define UFFD_API_RANGE_IOCTLS \ 481f1c6f07SAndrea Arcangeli ((__u64)1 << _UFFDIO_WAKE | \ 491f1c6f07SAndrea Arcangeli (__u64)1 << _UFFDIO_COPY | \ 50e06f1e1dSShaohua Li (__u64)1 << _UFFDIO_ZEROPAGE | \ 51f6191471SAxel Rasmussen (__u64)1 << _UFFDIO_WRITEPROTECT | \ 52f6191471SAxel Rasmussen (__u64)1 << _UFFDIO_CONTINUE) 53cac67329SMike Rapoport #define UFFD_API_RANGE_IOCTLS_BASIC \ 54cab350afSMike Kravetz ((__u64)1 << _UFFDIO_WAKE | \ 55f6191471SAxel Rasmussen (__u64)1 << _UFFDIO_COPY | \ 56b1f9e876SPeter Xu (__u64)1 << _UFFDIO_CONTINUE | \ 57b1f9e876SPeter Xu (__u64)1 << _UFFDIO_WRITEPROTECT) 581038628dSAndrea Arcangeli 591038628dSAndrea Arcangeli /* 601038628dSAndrea Arcangeli * Valid ioctl command number range with this API is from 0x00 to 611038628dSAndrea Arcangeli * 0x3F. UFFDIO_API is the fixed number, everything else can be 621038628dSAndrea Arcangeli * changed by implementing a different UFFD_API. If sticking to the 631038628dSAndrea Arcangeli * same UFFD_API more ioctl can be added and userland will be aware of 641038628dSAndrea Arcangeli * which ioctl the running kernel implements through the ioctl command 651038628dSAndrea Arcangeli * bitmask written by the UFFDIO_API. 661038628dSAndrea Arcangeli */ 671038628dSAndrea Arcangeli #define _UFFDIO_REGISTER (0x00) 681038628dSAndrea Arcangeli #define _UFFDIO_UNREGISTER (0x01) 691038628dSAndrea Arcangeli #define _UFFDIO_WAKE (0x02) 701f1c6f07SAndrea Arcangeli #define _UFFDIO_COPY (0x03) 711f1c6f07SAndrea Arcangeli #define _UFFDIO_ZEROPAGE (0x04) 7263b2d417SAndrea Arcangeli #define _UFFDIO_WRITEPROTECT (0x06) 73f6191471SAxel Rasmussen #define _UFFDIO_CONTINUE (0x07) 741038628dSAndrea Arcangeli #define _UFFDIO_API (0x3F) 751038628dSAndrea Arcangeli 761038628dSAndrea Arcangeli /* userfaultfd ioctl ids */ 771038628dSAndrea Arcangeli #define UFFDIO 0xAA 781038628dSAndrea Arcangeli #define UFFDIO_API _IOWR(UFFDIO, _UFFDIO_API, \ 791038628dSAndrea Arcangeli struct uffdio_api) 801038628dSAndrea Arcangeli #define UFFDIO_REGISTER _IOWR(UFFDIO, _UFFDIO_REGISTER, \ 811038628dSAndrea Arcangeli struct uffdio_register) 821038628dSAndrea Arcangeli #define UFFDIO_UNREGISTER _IOR(UFFDIO, _UFFDIO_UNREGISTER, \ 831038628dSAndrea Arcangeli struct uffdio_range) 841038628dSAndrea Arcangeli #define UFFDIO_WAKE _IOR(UFFDIO, _UFFDIO_WAKE, \ 851038628dSAndrea Arcangeli struct uffdio_range) 861f1c6f07SAndrea Arcangeli #define UFFDIO_COPY _IOWR(UFFDIO, _UFFDIO_COPY, \ 871f1c6f07SAndrea Arcangeli struct uffdio_copy) 881f1c6f07SAndrea Arcangeli #define UFFDIO_ZEROPAGE _IOWR(UFFDIO, _UFFDIO_ZEROPAGE, \ 891f1c6f07SAndrea Arcangeli struct uffdio_zeropage) 9063b2d417SAndrea Arcangeli #define UFFDIO_WRITEPROTECT _IOWR(UFFDIO, _UFFDIO_WRITEPROTECT, \ 9163b2d417SAndrea Arcangeli struct uffdio_writeprotect) 92808e9df4SGleb Fotengauer-Malinovskiy #define UFFDIO_CONTINUE _IOWR(UFFDIO, _UFFDIO_CONTINUE, \ 93f6191471SAxel Rasmussen struct uffdio_continue) 941038628dSAndrea Arcangeli 95a9b85f94SAndrea Arcangeli /* read() structure */ 96a9b85f94SAndrea Arcangeli struct uffd_msg { 97a9b85f94SAndrea Arcangeli __u8 event; 98a9b85f94SAndrea Arcangeli 99a9b85f94SAndrea Arcangeli __u8 reserved1; 100a9b85f94SAndrea Arcangeli __u16 reserved2; 101a9b85f94SAndrea Arcangeli __u32 reserved3; 102a9b85f94SAndrea Arcangeli 103a9b85f94SAndrea Arcangeli union { 104a9b85f94SAndrea Arcangeli struct { 105a9b85f94SAndrea Arcangeli __u64 flags; 106a9b85f94SAndrea Arcangeli __u64 address; 107a36985d3SAndrea Arcangeli union { 1089d4ac934SAlexey Perevalov __u32 ptid; 109a36985d3SAndrea Arcangeli } feat; 110a9b85f94SAndrea Arcangeli } pagefault; 111a9b85f94SAndrea Arcangeli 112a9b85f94SAndrea Arcangeli struct { 113893e26e6SPavel Emelyanov __u32 ufd; 114893e26e6SPavel Emelyanov } fork; 115893e26e6SPavel Emelyanov 116893e26e6SPavel Emelyanov struct { 11772f87654SPavel Emelyanov __u64 from; 11872f87654SPavel Emelyanov __u64 to; 11972f87654SPavel Emelyanov __u64 len; 12072f87654SPavel Emelyanov } remap; 12172f87654SPavel Emelyanov 12272f87654SPavel Emelyanov struct { 12305ce7724SPavel Emelyanov __u64 start; 12405ce7724SPavel Emelyanov __u64 end; 125d811914dSMike Rapoport } remove; 12605ce7724SPavel Emelyanov 12705ce7724SPavel Emelyanov struct { 128a9b85f94SAndrea Arcangeli /* unused reserved fields */ 129a9b85f94SAndrea Arcangeli __u64 reserved1; 130a9b85f94SAndrea Arcangeli __u64 reserved2; 131a9b85f94SAndrea Arcangeli __u64 reserved3; 132a9b85f94SAndrea Arcangeli } reserved; 133a9b85f94SAndrea Arcangeli } arg; 134a9b85f94SAndrea Arcangeli } __packed; 1351038628dSAndrea Arcangeli 1363f602d27SPavel Emelyanov /* 137a9b85f94SAndrea Arcangeli * Start at 0x12 and not at 0 to be more strict against bugs. 1383f602d27SPavel Emelyanov */ 139a9b85f94SAndrea Arcangeli #define UFFD_EVENT_PAGEFAULT 0x12 140a9b85f94SAndrea Arcangeli #define UFFD_EVENT_FORK 0x13 14172f87654SPavel Emelyanov #define UFFD_EVENT_REMAP 0x14 142d811914dSMike Rapoport #define UFFD_EVENT_REMOVE 0x15 143897ab3e0SMike Rapoport #define UFFD_EVENT_UNMAP 0x16 144a9b85f94SAndrea Arcangeli 145a9b85f94SAndrea Arcangeli /* flags for UFFD_EVENT_PAGEFAULT */ 146a9b85f94SAndrea Arcangeli #define UFFD_PAGEFAULT_FLAG_WRITE (1<<0) /* If this was a write fault */ 147a9b85f94SAndrea Arcangeli #define UFFD_PAGEFAULT_FLAG_WP (1<<1) /* If reason is VM_UFFD_WP */ 1487677f7fdSAxel Rasmussen #define UFFD_PAGEFAULT_FLAG_MINOR (1<<2) /* If reason is VM_UFFD_MINOR */ 1493f602d27SPavel Emelyanov 1501038628dSAndrea Arcangeli struct uffdio_api { 151a9b85f94SAndrea Arcangeli /* userland asks for an API number and the features to enable */ 1521038628dSAndrea Arcangeli __u64 api; 153a9b85f94SAndrea Arcangeli /* 154a9b85f94SAndrea Arcangeli * Kernel answers below with the all available features for 155a9b85f94SAndrea Arcangeli * the API, this notifies userland of which events and/or 156a9b85f94SAndrea Arcangeli * which flags for each event are enabled in the current 157a9b85f94SAndrea Arcangeli * kernel. 158a9b85f94SAndrea Arcangeli * 159a9b85f94SAndrea Arcangeli * Note: UFFD_EVENT_PAGEFAULT and UFFD_PAGEFAULT_FLAG_WRITE 160a9b85f94SAndrea Arcangeli * are to be considered implicitly always enabled in all kernels as 161a9b85f94SAndrea Arcangeli * long as the uffdio_api.api requested matches UFFD_API. 162163e11bcSAndrea Arcangeli * 163163e11bcSAndrea Arcangeli * UFFD_FEATURE_MISSING_HUGETLBFS means an UFFDIO_REGISTER 164163e11bcSAndrea Arcangeli * with UFFDIO_REGISTER_MODE_MISSING mode will succeed on 165163e11bcSAndrea Arcangeli * hugetlbfs virtual memory ranges. Adding or not adding 166163e11bcSAndrea Arcangeli * UFFD_FEATURE_MISSING_HUGETLBFS to uffdio_api.features has 167163e11bcSAndrea Arcangeli * no real functional effect after UFFDIO_API returns, but 168163e11bcSAndrea Arcangeli * it's only useful for an initial feature set probe at 169163e11bcSAndrea Arcangeli * UFFDIO_API time. There are two ways to use it: 170163e11bcSAndrea Arcangeli * 171163e11bcSAndrea Arcangeli * 1) by adding UFFD_FEATURE_MISSING_HUGETLBFS to the 172163e11bcSAndrea Arcangeli * uffdio_api.features before calling UFFDIO_API, an error 173163e11bcSAndrea Arcangeli * will be returned by UFFDIO_API on a kernel without 174163e11bcSAndrea Arcangeli * hugetlbfs missing support 175163e11bcSAndrea Arcangeli * 176163e11bcSAndrea Arcangeli * 2) the UFFD_FEATURE_MISSING_HUGETLBFS can not be added in 177163e11bcSAndrea Arcangeli * uffdio_api.features and instead it will be set by the 178163e11bcSAndrea Arcangeli * kernel in the uffdio_api.features if the kernel supports 179163e11bcSAndrea Arcangeli * it, so userland can later check if the feature flag is 180163e11bcSAndrea Arcangeli * present in uffdio_api.features after UFFDIO_API 181163e11bcSAndrea Arcangeli * succeeded. 18247dd9245SAndrea Arcangeli * 18347dd9245SAndrea Arcangeli * UFFD_FEATURE_MISSING_SHMEM works the same as 18447dd9245SAndrea Arcangeli * UFFD_FEATURE_MISSING_HUGETLBFS, but it applies to shmem 18547dd9245SAndrea Arcangeli * (i.e. tmpfs and other shmem based APIs). 1862d6d6f5aSPrakash Sangappa * 1872d6d6f5aSPrakash Sangappa * UFFD_FEATURE_SIGBUS feature means no page-fault 1882d6d6f5aSPrakash Sangappa * (UFFD_EVENT_PAGEFAULT) event will be delivered, instead 1892d6d6f5aSPrakash Sangappa * a SIGBUS signal will be sent to the faulting process. 1909d4ac934SAlexey Perevalov * 1919d4ac934SAlexey Perevalov * UFFD_FEATURE_THREAD_ID pid of the page faulted task_struct will 1929d4ac934SAlexey Perevalov * be returned, if feature is not requested 0 will be returned. 1937677f7fdSAxel Rasmussen * 1947677f7fdSAxel Rasmussen * UFFD_FEATURE_MINOR_HUGETLBFS indicates that minor faults 1957677f7fdSAxel Rasmussen * can be intercepted (via REGISTER_MODE_MINOR) for 1967677f7fdSAxel Rasmussen * hugetlbfs-backed pages. 197964ab004SAxel Rasmussen * 198964ab004SAxel Rasmussen * UFFD_FEATURE_MINOR_SHMEM indicates the same support as 199964ab004SAxel Rasmussen * UFFD_FEATURE_MINOR_HUGETLBFS, but for shmem-backed pages instead. 200824ddc60SNadav Amit * 201824ddc60SNadav Amit * UFFD_FEATURE_EXACT_ADDRESS indicates that the exact address of page 202824ddc60SNadav Amit * faults would be provided and the offset within the page would not be 203824ddc60SNadav Amit * masked. 204b1f9e876SPeter Xu * 205b1f9e876SPeter Xu * UFFD_FEATURE_WP_HUGETLBFS_SHMEM indicates that userfaultfd 206b1f9e876SPeter Xu * write-protection mode is supported on both shmem and hugetlbfs. 2072bad466cSPeter Xu * 2082bad466cSPeter Xu * UFFD_FEATURE_WP_UNPOPULATED indicates that userfaultfd 2092bad466cSPeter Xu * write-protection mode will always apply to unpopulated pages 2102bad466cSPeter Xu * (i.e. empty ptes). This will be the default behavior for shmem 2112bad466cSPeter Xu * & hugetlbfs, so this flag only affects anonymous memory behavior 2122bad466cSPeter Xu * when userfault write-protection mode is registered. 213a9b85f94SAndrea Arcangeli */ 214a9b85f94SAndrea Arcangeli #define UFFD_FEATURE_PAGEFAULT_FLAG_WP (1<<0) 215a9b85f94SAndrea Arcangeli #define UFFD_FEATURE_EVENT_FORK (1<<1) 21672f87654SPavel Emelyanov #define UFFD_FEATURE_EVENT_REMAP (1<<2) 217d811914dSMike Rapoport #define UFFD_FEATURE_EVENT_REMOVE (1<<3) 218163e11bcSAndrea Arcangeli #define UFFD_FEATURE_MISSING_HUGETLBFS (1<<4) 21947dd9245SAndrea Arcangeli #define UFFD_FEATURE_MISSING_SHMEM (1<<5) 220897ab3e0SMike Rapoport #define UFFD_FEATURE_EVENT_UNMAP (1<<6) 2212d6d6f5aSPrakash Sangappa #define UFFD_FEATURE_SIGBUS (1<<7) 2229d4ac934SAlexey Perevalov #define UFFD_FEATURE_THREAD_ID (1<<8) 2237677f7fdSAxel Rasmussen #define UFFD_FEATURE_MINOR_HUGETLBFS (1<<9) 224964ab004SAxel Rasmussen #define UFFD_FEATURE_MINOR_SHMEM (1<<10) 225824ddc60SNadav Amit #define UFFD_FEATURE_EXACT_ADDRESS (1<<11) 226b1f9e876SPeter Xu #define UFFD_FEATURE_WP_HUGETLBFS_SHMEM (1<<12) 2272bad466cSPeter Xu #define UFFD_FEATURE_WP_UNPOPULATED (1<<13) 2283f602d27SPavel Emelyanov __u64 features; 229a9b85f94SAndrea Arcangeli 2301038628dSAndrea Arcangeli __u64 ioctls; 2311038628dSAndrea Arcangeli }; 2321038628dSAndrea Arcangeli 2331038628dSAndrea Arcangeli struct uffdio_range { 2341038628dSAndrea Arcangeli __u64 start; 2351038628dSAndrea Arcangeli __u64 len; 2361038628dSAndrea Arcangeli }; 2371038628dSAndrea Arcangeli 2381038628dSAndrea Arcangeli struct uffdio_register { 2391038628dSAndrea Arcangeli struct uffdio_range range; 2401038628dSAndrea Arcangeli #define UFFDIO_REGISTER_MODE_MISSING ((__u64)1<<0) 2411038628dSAndrea Arcangeli #define UFFDIO_REGISTER_MODE_WP ((__u64)1<<1) 2427677f7fdSAxel Rasmussen #define UFFDIO_REGISTER_MODE_MINOR ((__u64)1<<2) 2431038628dSAndrea Arcangeli __u64 mode; 2441038628dSAndrea Arcangeli 2451038628dSAndrea Arcangeli /* 2461038628dSAndrea Arcangeli * kernel answers which ioctl commands are available for the 2471038628dSAndrea Arcangeli * range, keep at the end as the last 8 bytes aren't read. 2481038628dSAndrea Arcangeli */ 2491038628dSAndrea Arcangeli __u64 ioctls; 2501038628dSAndrea Arcangeli }; 2511038628dSAndrea Arcangeli 2521f1c6f07SAndrea Arcangeli struct uffdio_copy { 2531f1c6f07SAndrea Arcangeli __u64 dst; 2541f1c6f07SAndrea Arcangeli __u64 src; 2551f1c6f07SAndrea Arcangeli __u64 len; 2561f1c6f07SAndrea Arcangeli #define UFFDIO_COPY_MODE_DONTWAKE ((__u64)1<<0) 25772981e0eSAndrea Arcangeli /* 25872981e0eSAndrea Arcangeli * UFFDIO_COPY_MODE_WP will map the page write protected on 25972981e0eSAndrea Arcangeli * the fly. UFFDIO_COPY_MODE_WP is available only if the 26072981e0eSAndrea Arcangeli * write protected ioctl is implemented for the range 26172981e0eSAndrea Arcangeli * according to the uffdio_register.ioctls. 26272981e0eSAndrea Arcangeli */ 26372981e0eSAndrea Arcangeli #define UFFDIO_COPY_MODE_WP ((__u64)1<<1) 2641f1c6f07SAndrea Arcangeli __u64 mode; 2651f1c6f07SAndrea Arcangeli 2661f1c6f07SAndrea Arcangeli /* 2671f1c6f07SAndrea Arcangeli * "copy" is written by the ioctl and must be at the end: the 2681f1c6f07SAndrea Arcangeli * copy_from_user will not read the last 8 bytes. 2691f1c6f07SAndrea Arcangeli */ 2701f1c6f07SAndrea Arcangeli __s64 copy; 2711f1c6f07SAndrea Arcangeli }; 2721f1c6f07SAndrea Arcangeli 2731f1c6f07SAndrea Arcangeli struct uffdio_zeropage { 2741f1c6f07SAndrea Arcangeli struct uffdio_range range; 2751f1c6f07SAndrea Arcangeli #define UFFDIO_ZEROPAGE_MODE_DONTWAKE ((__u64)1<<0) 2761f1c6f07SAndrea Arcangeli __u64 mode; 2771f1c6f07SAndrea Arcangeli 2781f1c6f07SAndrea Arcangeli /* 2791f1c6f07SAndrea Arcangeli * "zeropage" is written by the ioctl and must be at the end: 2801f1c6f07SAndrea Arcangeli * the copy_from_user will not read the last 8 bytes. 2811f1c6f07SAndrea Arcangeli */ 2821f1c6f07SAndrea Arcangeli __s64 zeropage; 2831f1c6f07SAndrea Arcangeli }; 2841f1c6f07SAndrea Arcangeli 28563b2d417SAndrea Arcangeli struct uffdio_writeprotect { 28663b2d417SAndrea Arcangeli struct uffdio_range range; 28763b2d417SAndrea Arcangeli /* 28863b2d417SAndrea Arcangeli * UFFDIO_WRITEPROTECT_MODE_WP: set the flag to write protect a range, 28963b2d417SAndrea Arcangeli * unset the flag to undo protection of a range which was previously 29063b2d417SAndrea Arcangeli * write protected. 29163b2d417SAndrea Arcangeli * 29263b2d417SAndrea Arcangeli * UFFDIO_WRITEPROTECT_MODE_DONTWAKE: set the flag to avoid waking up 29363b2d417SAndrea Arcangeli * any wait thread after the operation succeeds. 29463b2d417SAndrea Arcangeli * 29563b2d417SAndrea Arcangeli * NOTE: Write protecting a region (WP=1) is unrelated to page faults, 29663b2d417SAndrea Arcangeli * therefore DONTWAKE flag is meaningless with WP=1. Removing write 29763b2d417SAndrea Arcangeli * protection (WP=0) in response to a page fault wakes the faulting 29863b2d417SAndrea Arcangeli * task unless DONTWAKE is set. 29963b2d417SAndrea Arcangeli */ 30063b2d417SAndrea Arcangeli #define UFFDIO_WRITEPROTECT_MODE_WP ((__u64)1<<0) 30163b2d417SAndrea Arcangeli #define UFFDIO_WRITEPROTECT_MODE_DONTWAKE ((__u64)1<<1) 30263b2d417SAndrea Arcangeli __u64 mode; 30363b2d417SAndrea Arcangeli }; 30463b2d417SAndrea Arcangeli 305f6191471SAxel Rasmussen struct uffdio_continue { 306f6191471SAxel Rasmussen struct uffdio_range range; 307f6191471SAxel Rasmussen #define UFFDIO_CONTINUE_MODE_DONTWAKE ((__u64)1<<0) 308*02891844SAxel Rasmussen /* 309*02891844SAxel Rasmussen * UFFDIO_CONTINUE_MODE_WP will map the page write protected on 310*02891844SAxel Rasmussen * the fly. UFFDIO_CONTINUE_MODE_WP is available only if the 311*02891844SAxel Rasmussen * write protected ioctl is implemented for the range 312*02891844SAxel Rasmussen * according to the uffdio_register.ioctls. 313*02891844SAxel Rasmussen */ 314*02891844SAxel Rasmussen #define UFFDIO_CONTINUE_MODE_WP ((__u64)1<<1) 315f6191471SAxel Rasmussen __u64 mode; 316f6191471SAxel Rasmussen 317f6191471SAxel Rasmussen /* 318f6191471SAxel Rasmussen * Fields below here are written by the ioctl and must be at the end: 319f6191471SAxel Rasmussen * the copy_from_user will not read past here. 320f6191471SAxel Rasmussen */ 321f6191471SAxel Rasmussen __s64 mapped; 322f6191471SAxel Rasmussen }; 323f6191471SAxel Rasmussen 32437cd0575SLokesh Gidra /* 32537cd0575SLokesh Gidra * Flags for the userfaultfd(2) system call itself. 32637cd0575SLokesh Gidra */ 32737cd0575SLokesh Gidra 32837cd0575SLokesh Gidra /* 32937cd0575SLokesh Gidra * Create a userfaultfd that can handle page faults only in user mode. 33037cd0575SLokesh Gidra */ 33137cd0575SLokesh Gidra #define UFFD_USER_MODE_ONLY 1 33237cd0575SLokesh Gidra 3331038628dSAndrea Arcangeli #endif /* _LINUX_USERFAULTFD_H */ 334