mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-14 16:46:51 +07:00
9ff42d10c3
As include/uapi/linux/userfaultfd.h is a user visible header file, it should not include kernel-exclusive header files. So trying to build the userfaultfd test program from the selftests directory fails, since it contains a reference to linux/compiler.h. As it turns out, that header is not really needed there, so we can simply remove it to fix that issue. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
168 lines
4.3 KiB
C
168 lines
4.3 KiB
C
/*
|
|
* include/linux/userfaultfd.h
|
|
*
|
|
* Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org>
|
|
* Copyright (C) 2015 Red Hat, Inc.
|
|
*
|
|
*/
|
|
|
|
#ifndef _LINUX_USERFAULTFD_H
|
|
#define _LINUX_USERFAULTFD_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
#define UFFD_API ((__u64)0xAA)
|
|
/*
|
|
* After implementing the respective features it will become:
|
|
* #define UFFD_API_FEATURES (UFFD_FEATURE_PAGEFAULT_FLAG_WP | \
|
|
* UFFD_FEATURE_EVENT_FORK)
|
|
*/
|
|
#define UFFD_API_FEATURES (0)
|
|
#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)
|
|
|
|
/*
|
|
* 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_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)
|
|
|
|
/* read() structure */
|
|
struct uffd_msg {
|
|
__u8 event;
|
|
|
|
__u8 reserved1;
|
|
__u16 reserved2;
|
|
__u32 reserved3;
|
|
|
|
union {
|
|
struct {
|
|
__u64 flags;
|
|
__u64 address;
|
|
} pagefault;
|
|
|
|
struct {
|
|
/* unused reserved fields */
|
|
__u64 reserved1;
|
|
__u64 reserved2;
|
|
__u64 reserved3;
|
|
} reserved;
|
|
} arg;
|
|
} __packed;
|
|
|
|
/*
|
|
* Start at 0x12 and not at 0 to be more strict against bugs.
|
|
*/
|
|
#define UFFD_EVENT_PAGEFAULT 0x12
|
|
#if 0 /* not available yet */
|
|
#define UFFD_EVENT_FORK 0x13
|
|
#endif
|
|
|
|
/* 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.
|
|
*/
|
|
#if 0 /* not available yet */
|
|
#define UFFD_FEATURE_PAGEFAULT_FLAG_WP (1<<0)
|
|
#define UFFD_FEATURE_EVENT_FORK (1<<1)
|
|
#endif
|
|
__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;
|
|
/*
|
|
* There will be a wrprotection flag later that allows to map
|
|
* pages wrprotected on the fly. And such a flag will be
|
|
* available if the wrprotection ioctl are implemented for the
|
|
* range according to the uffdio_register.ioctls.
|
|
*/
|
|
#define UFFDIO_COPY_MODE_DONTWAKE ((__u64)1<<0)
|
|
__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;
|
|
};
|
|
|
|
#endif /* _LINUX_USERFAULTFD_H */
|