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Current File : /usr/include/linux/userfaultfd.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 *  include/linux/userfaultfd.h
 *
 *  Copyright (C) 2007  Davide Libenzi <[email protected]>
 *  Copyright (C) 2015  Red Hat, Inc.
 *
 */

#ifndef _LINUX_USERFAULTFD_H
#define _LINUX_USERFAULTFD_H

#include <linux/types.h>

/*
 * If the UFFDIO_API is upgraded someday, the UFFDIO_UNREGISTER and
 * UFFDIO_WAKE ioctls should be defined as _IOW and not as _IOR.  In
 * userfaultfd.h we assumed the kernel was reading (instead _IOC_READ
 * means the userland is reading).
 */
#define UFFD_API ((__u64)0xAA)
#define UFFD_API_FEATURES (UFFD_FEATURE_PAGEFAULT_FLAG_WP |	\
			   UFFD_FEATURE_EVENT_FORK |		\
			   UFFD_FEATURE_EVENT_REMAP |		\
			   UFFD_FEATURE_EVENT_REMOVE |	\
			   UFFD_FEATURE_EVENT_UNMAP |		\
			   UFFD_FEATURE_MISSING_HUGETLBFS |	\
			   UFFD_FEATURE_MISSING_SHMEM |		\
			   UFFD_FEATURE_SIGBUS |		\
			   UFFD_FEATURE_THREAD_ID)
#define UFFD_API_IOCTLS				\
	((__u64)1 << _UFFDIO_REGISTER |		\
	 (__u64)1 << _UFFDIO_UNREGISTER |	\
	 (__u64)1 << _UFFDIO_API)
#define UFFD_API_RANGE_IOCTLS			\
	((__u64)1 << _UFFDIO_WAKE |		\
	 (__u64)1 << _UFFDIO_COPY |		\
	 (__u64)1 << _UFFDIO_ZEROPAGE |		\
	 (__u64)1 << _UFFDIO_WRITEPROTECT)
#define UFFD_API_RANGE_IOCTLS_BASIC		\
	((__u64)1 << _UFFDIO_WAKE |		\
	 (__u64)1 << _UFFDIO_COPY)

/*
 * Valid ioctl command number range with this API is from 0x00 to
 * 0x3F.  UFFDIO_API is the fixed number, everything else can be
 * changed by implementing a different UFFD_API. If sticking to the
 * same UFFD_API more ioctl can be added and userland will be aware of
 * which ioctl the running kernel implements through the ioctl command
 * bitmask written by the UFFDIO_API.
 */
#define _UFFDIO_REGISTER		(0x00)
#define _UFFDIO_UNREGISTER		(0x01)
#define _UFFDIO_WAKE			(0x02)
#define _UFFDIO_COPY			(0x03)
#define _UFFDIO_ZEROPAGE		(0x04)
#define _UFFDIO_WRITEPROTECT		(0x06)
#define _UFFDIO_API			(0x3F)

/* userfaultfd ioctl ids */
#define UFFDIO 0xAA
#define UFFDIO_API		_IOWR(UFFDIO, _UFFDIO_API,	\
				      struct uffdio_api)
#define UFFDIO_REGISTER		_IOWR(UFFDIO, _UFFDIO_REGISTER, \
				      struct uffdio_register)
#define UFFDIO_UNREGISTER	_IOR(UFFDIO, _UFFDIO_UNREGISTER,	\
				     struct uffdio_range)
#define UFFDIO_WAKE		_IOR(UFFDIO, _UFFDIO_WAKE,	\
				     struct uffdio_range)
#define UFFDIO_COPY		_IOWR(UFFDIO, _UFFDIO_COPY,	\
				      struct uffdio_copy)
#define UFFDIO_ZEROPAGE		_IOWR(UFFDIO, _UFFDIO_ZEROPAGE,	\
				      struct uffdio_zeropage)
#define UFFDIO_WRITEPROTECT	_IOWR(UFFDIO, _UFFDIO_WRITEPROTECT, \
				      struct uffdio_writeprotect)

/* read() structure */
struct uffd_msg {
	__u8	event;

	__u8	reserved1;
	__u16	reserved2;
	__u32	reserved3;

	union {
		struct {
			__u64	flags;
			__u64	address;
			union {
				__u32 ptid;
			} feat;
		} pagefault;

		struct {
			__u32	ufd;
		} fork;

		struct {
			__u64	from;
			__u64	to;
			__u64	len;
		} remap;

		struct {
			__u64	start;
			__u64	end;
		} remove;

		struct {
			/* unused reserved fields */
			__u64	reserved1;
			__u64	reserved2;
			__u64	reserved3;
		} reserved;
	} arg;
} __attribute__((packed));

/*
 * Start at 0x12 and not at 0 to be more strict against bugs.
 */
#define UFFD_EVENT_PAGEFAULT	0x12
#define UFFD_EVENT_FORK		0x13
#define UFFD_EVENT_REMAP	0x14
#define UFFD_EVENT_REMOVE	0x15
#define UFFD_EVENT_UNMAP	0x16

/* flags for UFFD_EVENT_PAGEFAULT */
#define UFFD_PAGEFAULT_FLAG_WRITE	(1<<0)	/* If this was a write fault */
#define UFFD_PAGEFAULT_FLAG_WP		(1<<1)	/* If reason is VM_UFFD_WP */

struct uffdio_api {
	/* userland asks for an API number and the features to enable */
	__u64 api;
	/*
	 * Kernel answers below with the all available features for
	 * the API, this notifies userland of which events and/or
	 * which flags for each event are enabled in the current
	 * kernel.
	 *
	 * Note: UFFD_EVENT_PAGEFAULT and UFFD_PAGEFAULT_FLAG_WRITE
	 * are to be considered implicitly always enabled in all kernels as
	 * long as the uffdio_api.api requested matches UFFD_API.
	 *
	 * UFFD_FEATURE_MISSING_HUGETLBFS means an UFFDIO_REGISTER
	 * with UFFDIO_REGISTER_MODE_MISSING mode will succeed on
	 * hugetlbfs virtual memory ranges. Adding or not adding
	 * UFFD_FEATURE_MISSING_HUGETLBFS to uffdio_api.features has
	 * no real functional effect after UFFDIO_API returns, but
	 * it's only useful for an initial feature set probe at
	 * UFFDIO_API time. There are two ways to use it:
	 *
	 * 1) by adding UFFD_FEATURE_MISSING_HUGETLBFS to the
	 *    uffdio_api.features before calling UFFDIO_API, an error
	 *    will be returned by UFFDIO_API on a kernel without
	 *    hugetlbfs missing support
	 *
	 * 2) the UFFD_FEATURE_MISSING_HUGETLBFS can not be added in
	 *    uffdio_api.features and instead it will be set by the
	 *    kernel in the uffdio_api.features if the kernel supports
	 *    it, so userland can later check if the feature flag is
	 *    present in uffdio_api.features after UFFDIO_API
	 *    succeeded.
	 *
	 * UFFD_FEATURE_MISSING_SHMEM works the same as
	 * UFFD_FEATURE_MISSING_HUGETLBFS, but it applies to shmem
	 * (i.e. tmpfs and other shmem based APIs).
	 *
	 * UFFD_FEATURE_SIGBUS feature means no page-fault
	 * (UFFD_EVENT_PAGEFAULT) event will be delivered, instead
	 * a SIGBUS signal will be sent to the faulting process.
	 *
	 * UFFD_FEATURE_THREAD_ID pid of the page faulted task_struct will
	 * be returned, if feature is not requested 0 will be returned.
	 */
#define UFFD_FEATURE_PAGEFAULT_FLAG_WP		(1<<0)
#define UFFD_FEATURE_EVENT_FORK			(1<<1)
#define UFFD_FEATURE_EVENT_REMAP		(1<<2)
#define UFFD_FEATURE_EVENT_REMOVE		(1<<3)
#define UFFD_FEATURE_MISSING_HUGETLBFS		(1<<4)
#define UFFD_FEATURE_MISSING_SHMEM		(1<<5)
#define UFFD_FEATURE_EVENT_UNMAP		(1<<6)
#define UFFD_FEATURE_SIGBUS			(1<<7)
#define UFFD_FEATURE_THREAD_ID			(1<<8)
	__u64 features;

	__u64 ioctls;
};

struct uffdio_range {
	__u64 start;
	__u64 len;
};

struct uffdio_register {
	struct uffdio_range range;
#define UFFDIO_REGISTER_MODE_MISSING	((__u64)1<<0)
#define UFFDIO_REGISTER_MODE_WP		((__u64)1<<1)
	__u64 mode;

	/*
	 * kernel answers which ioctl commands are available for the
	 * range, keep at the end as the last 8 bytes aren't read.
	 */
	__u64 ioctls;
};

struct uffdio_copy {
	__u64 dst;
	__u64 src;
	__u64 len;
#define UFFDIO_COPY_MODE_DONTWAKE		((__u64)1<<0)
	/*
	 * UFFDIO_COPY_MODE_WP will map the page write protected on
	 * the fly.  UFFDIO_COPY_MODE_WP is available only if the
	 * write protected ioctl is implemented for the range
	 * according to the uffdio_register.ioctls.
	 */
#define UFFDIO_COPY_MODE_WP			((__u64)1<<1)
	__u64 mode;

	/*
	 * "copy" is written by the ioctl and must be at the end: the
	 * copy_from_user will not read the last 8 bytes.
	 */
	__s64 copy;
};

struct uffdio_zeropage {
	struct uffdio_range range;
#define UFFDIO_ZEROPAGE_MODE_DONTWAKE		((__u64)1<<0)
	__u64 mode;

	/*
	 * "zeropage" is written by the ioctl and must be at the end:
	 * the copy_from_user will not read the last 8 bytes.
	 */
	__s64 zeropage;
};

struct uffdio_writeprotect {
	struct uffdio_range range;
/*
 * UFFDIO_WRITEPROTECT_MODE_WP: set the flag to write protect a range,
 * unset the flag to undo protection of a range which was previously
 * write protected.
 *
 * UFFDIO_WRITEPROTECT_MODE_DONTWAKE: set the flag to avoid waking up
 * any wait thread after the operation succeeds.
 *
 * NOTE: Write protecting a region (WP=1) is unrelated to page faults,
 * therefore DONTWAKE flag is meaningless with WP=1.  Removing write
 * protection (WP=0) in response to a page fault wakes the faulting
 * task unless DONTWAKE is set.
 */
#define UFFDIO_WRITEPROTECT_MODE_WP		((__u64)1<<0)
#define UFFDIO_WRITEPROTECT_MODE_DONTWAKE	((__u64)1<<1)
	__u64 mode;
};

#endif /* _LINUX_USERFAULTFD_H */

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