1 /* 2 * Linux UFFD-WP support 3 * 4 * Copyright Virtuozzo GmbH, 2020 5 * 6 * Authors: 7 * Andrey Gruzdev <andrey.gruzdev@virtuozzo.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or 10 * later. See the COPYING file in the top-level directory. 11 */ 12 13 #ifndef USERFAULTFD_H 14 #define USERFAULTFD_H 15 16 #ifdef CONFIG_LINUX 17 18 #include "exec/hwaddr.h" 19 #include <linux/userfaultfd.h> 20 21 /** 22 * uffd_open(): Open an userfaultfd handle for current context. 23 * 24 * @flags: The flags we want to pass in when creating the handle. 25 * 26 * Returns: the uffd handle if >=0, or <0 if error happens. 27 */ 28 int uffd_open(int flags); 29 int uffd_query_features(uint64_t *features); 30 int uffd_create_fd(uint64_t features, bool non_blocking); 31 void uffd_close_fd(int uffd_fd); 32 int uffd_register_memory(int uffd_fd, void *addr, uint64_t length, 33 uint64_t mode, uint64_t *ioctls); 34 int uffd_unregister_memory(int uffd_fd, void *addr, uint64_t length); 35 int uffd_change_protection(int uffd_fd, void *addr, uint64_t length, 36 bool wp, bool dont_wake); 37 int uffd_copy_page(int uffd_fd, void *dst_addr, void *src_addr, 38 uint64_t length, bool dont_wake); 39 int uffd_zero_page(int uffd_fd, void *addr, uint64_t length, bool dont_wake); 40 int uffd_wakeup(int uffd_fd, void *addr, uint64_t length); 41 int uffd_read_events(int uffd_fd, struct uffd_msg *msgs, int count); 42 bool uffd_poll_events(int uffd_fd, int tmo); 43 44 #endif /* CONFIG_LINUX */ 45 46 #endif /* USERFAULTFD_H */ 47