/*
 * Linux UFFD-WP support
 *
 * Copyright Virtuozzo GmbH, 2020
 *
 * Authors:
 *  Andrey Gruzdev   <andrey.gruzdev@virtuozzo.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or
 * later.  See the COPYING file in the top-level directory.
 */

#ifndef USERFAULTFD_H
#define USERFAULTFD_H

#ifdef CONFIG_LINUX

#include "exec/hwaddr.h"
#include <linux/userfaultfd.h>

/**
 * uffd_open(): Open an userfaultfd handle for current context.
 *
 * @flags: The flags we want to pass in when creating the handle.
 *
 * Returns: the uffd handle if >=0, or <0 if error happens.
 */
int uffd_open(int flags);
int uffd_query_features(uint64_t *features);
int uffd_create_fd(uint64_t features, bool non_blocking);
void uffd_close_fd(int uffd_fd);
int uffd_register_memory(int uffd_fd, void *addr, uint64_t length,
        uint64_t mode, uint64_t *ioctls);
int uffd_unregister_memory(int uffd_fd, void *addr, uint64_t length);
int uffd_change_protection(int uffd_fd, void *addr, uint64_t length,
        bool wp, bool dont_wake);
int uffd_copy_page(int uffd_fd, void *dst_addr, void *src_addr,
        uint64_t length, bool dont_wake);
int uffd_zero_page(int uffd_fd, void *addr, uint64_t length, bool dont_wake);
int uffd_wakeup(int uffd_fd, void *addr, uint64_t length);
int uffd_read_events(int uffd_fd, struct uffd_msg *msgs, int count);
bool uffd_poll_events(int uffd_fd, int tmo);

#endif /* CONFIG_LINUX */

#endif /* USERFAULTFD_H */