include/uapi/linux/hyperv.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/hyperv.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/hyperv.h
Extension
.h
Size
11191 bytes
Lines
412
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct hv_vss_hdr {
	__u8 operation;
	__u8 reserved[7];
} __attribute__((packed));


/*
 * Flag values for the hv_vss_check_feature. Linux supports only
 * one value.
 */
#define VSS_HBU_NO_AUTO_RECOVERY	0x00000005

struct hv_vss_check_feature {
	__u32 flags;
} __attribute__((packed));

struct hv_vss_check_dm_info {
	__u32 flags;
} __attribute__((packed));

/*
 * struct hv_vss_msg encodes the fields that the Linux VSS
 * driver accesses. However, FREEZE messages from Hyper-V contain
 * additional LUN information that Linux doesn't use and are not
 * represented in struct hv_vss_msg. A received FREEZE message may
 * be as large as 6,260 bytes, so the driver must allocate at least
 * that much space, not sizeof(struct hv_vss_msg). Other messages
 * such as AUTO_RECOVER may be as large as 12,500 bytes. However,
 * because the Linux VSS driver responds that it doesn't support
 * auto-recovery, it should not receive such messages.
 */
struct hv_vss_msg {
	union {
		struct hv_vss_hdr vss_hdr;
		int error;
	};
	union {
		struct hv_vss_check_feature vss_cf;
		struct hv_vss_check_dm_info dm_info;
	};
} __attribute__((packed));

/*
 * Implementation of a host to guest copy facility.
 */

#define FCOPY_VERSION_0 0
#define FCOPY_VERSION_1 1
#define FCOPY_CURRENT_VERSION FCOPY_VERSION_1
#define W_MAX_PATH 260

enum hv_fcopy_op {
	START_FILE_COPY = 0,
	WRITE_TO_FILE,
	COMPLETE_FCOPY,
	CANCEL_FCOPY,
};

struct hv_fcopy_hdr {
	__u32 operation;
	__u8 service_id0[16]; /* currently unused */
	__u8 service_id1[16]; /* currently unused */
} __attribute__((packed));

#define OVER_WRITE	0x1
#define CREATE_PATH	0x2

struct hv_start_fcopy {
	struct hv_fcopy_hdr hdr;
	__u16 file_name[W_MAX_PATH];
	__u16 path_name[W_MAX_PATH];
	__u32 copy_flags;
	__u64 file_size;
} __attribute__((packed));

/*
 * The file is chunked into fragments.
 */
#define DATA_FRAGMENT	(6 * 1024)

struct hv_do_fcopy {
	struct hv_fcopy_hdr hdr;
	__u32   pad;
	__u64	offset;
	__u32	size;
	__u8	data[DATA_FRAGMENT];
} __attribute__((packed));

/*
 * An implementation of HyperV key value pair (KVP) functionality for Linux.

Annotation

Implementation Notes