include/qemu/userfaultfd.h

   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 */