linux/include/linux/hyperv.h
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   1/*
   2 *
   3 * Copyright (c) 2011, Microsoft Corporation.
   4 *
   5 * This program is free software; you can redistribute it and/or modify it
   6 * under the terms and conditions of the GNU General Public License,
   7 * version 2, as published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope it will be useful, but WITHOUT
  10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 * more details.
  13 *
  14 * You should have received a copy of the GNU General Public License along with
  15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16 * Place - Suite 330, Boston, MA 02111-1307 USA.
  17 *
  18 * Authors:
  19 *   Haiyang Zhang <haiyangz@microsoft.com>
  20 *   Hank Janssen  <hjanssen@microsoft.com>
  21 *   K. Y. Srinivasan <kys@microsoft.com>
  22 *
  23 */
  24
  25#ifndef _HYPERV_H
  26#define _HYPERV_H
  27
  28#include <linux/types.h>
  29
  30/*
  31 * An implementation of HyperV key value pair (KVP) functionality for Linux.
  32 *
  33 *
  34 * Copyright (C) 2010, Novell, Inc.
  35 * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
  36 *
  37 */
  38
  39/*
  40 * Maximum value size - used for both key names and value data, and includes
  41 * any applicable NULL terminators.
  42 *
  43 * Note:  This limit is somewhat arbitrary, but falls easily within what is
  44 * supported for all native guests (back to Win 2000) and what is reasonable
  45 * for the IC KVP exchange functionality.  Note that Windows Me/98/95 are
  46 * limited to 255 character key names.
  47 *
  48 * MSDN recommends not storing data values larger than 2048 bytes in the
  49 * registry.
  50 *
  51 * Note:  This value is used in defining the KVP exchange message - this value
  52 * cannot be modified without affecting the message size and compatibility.
  53 */
  54
  55/*
  56 * bytes, including any null terminators
  57 */
  58#define HV_KVP_EXCHANGE_MAX_VALUE_SIZE          (2048)
  59
  60
  61/*
  62 * Maximum key size - the registry limit for the length of an entry name
  63 * is 256 characters, including the null terminator
  64 */
  65
  66#define HV_KVP_EXCHANGE_MAX_KEY_SIZE            (512)
  67
  68/*
  69 * In Linux, we implement the KVP functionality in two components:
  70 * 1) The kernel component which is packaged as part of the hv_utils driver
  71 * is responsible for communicating with the host and responsible for
  72 * implementing the host/guest protocol. 2) A user level daemon that is
  73 * responsible for data gathering.
  74 *
  75 * Host/Guest Protocol: The host iterates over an index and expects the guest
  76 * to assign a key name to the index and also return the value corresponding to
  77 * the key. The host will have atmost one KVP transaction outstanding at any
  78 * given point in time. The host side iteration stops when the guest returns
  79 * an error. Microsoft has specified the following mapping of key names to
  80 * host specified index:
  81 *
  82 *      Index           Key Name
  83 *      0               FullyQualifiedDomainName
  84 *      1               IntegrationServicesVersion
  85 *      2               NetworkAddressIPv4
  86 *      3               NetworkAddressIPv6
  87 *      4               OSBuildNumber
  88 *      5               OSName
  89 *      6               OSMajorVersion
  90 *      7               OSMinorVersion
  91 *      8               OSVersion
  92 *      9               ProcessorArchitecture
  93 *
  94 * The Windows host expects the Key Name and Key Value to be encoded in utf16.
  95 *
  96 * Guest Kernel/KVP Daemon Protocol: As noted earlier, we implement all of the
  97 * data gathering functionality in a user mode daemon. The user level daemon
  98 * is also responsible for binding the key name to the index as well. The
  99 * kernel and user-level daemon communicate using a connector channel.
 100 *
 101 * The user mode component first registers with the
 102 * the kernel component. Subsequently, the kernel component requests, data
 103 * for the specified keys. In response to this message the user mode component
 104 * fills in the value corresponding to the specified key. We overload the
 105 * sequence field in the cn_msg header to define our KVP message types.
 106 *
 107 *
 108 * The kernel component simply acts as a conduit for communication between the
 109 * Windows host and the user-level daemon. The kernel component passes up the
 110 * index received from the Host to the user-level daemon. If the index is
 111 * valid (supported), the corresponding key as well as its
 112 * value (both are strings) is returned. If the index is invalid
 113 * (not supported), a NULL key string is returned.
 114 */
 115
 116
 117/*
 118 * Registry value types.
 119 */
 120
 121#define REG_SZ 1
 122#define REG_U32 4
 123#define REG_U64 8
 124
 125/*
 126 * As we look at expanding the KVP functionality to include
 127 * IP injection functionality, we need to maintain binary
 128 * compatibility with older daemons.
 129 *
 130 * The KVP opcodes are defined by the host and it was unfortunate
 131 * that I chose to treat the registration operation as part of the
 132 * KVP operations defined by the host.
 133 * Here is the level of compatibility
 134 * (between the user level daemon and the kernel KVP driver) that we
 135 * will implement:
 136 *
 137 * An older daemon will always be supported on a newer driver.
 138 * A given user level daemon will require a minimal version of the
 139 * kernel driver.
 140 * If we cannot handle the version differences, we will fail gracefully
 141 * (this can happen when we have a user level daemon that is more
 142 * advanced than the KVP driver.
 143 *
 144 * We will use values used in this handshake for determining if we have
 145 * workable user level daemon and the kernel driver. We begin by taking the
 146 * registration opcode out of the KVP opcode namespace. We will however,
 147 * maintain compatibility with the existing user-level daemon code.
 148 */
 149
 150/*
 151 * Daemon code not supporting IP injection (legacy daemon).
 152 */
 153
 154#define KVP_OP_REGISTER 4
 155
 156/*
 157 * Daemon code supporting IP injection.
 158 * The KVP opcode field is used to communicate the
 159 * registration information; so define a namespace that
 160 * will be distinct from the host defined KVP opcode.
 161 */
 162
 163#define KVP_OP_REGISTER1 100
 164
 165enum hv_kvp_exchg_op {
 166        KVP_OP_GET = 0,
 167        KVP_OP_SET,
 168        KVP_OP_DELETE,
 169        KVP_OP_ENUMERATE,
 170        KVP_OP_GET_IP_INFO,
 171        KVP_OP_SET_IP_INFO,
 172        KVP_OP_COUNT /* Number of operations, must be last. */
 173};
 174
 175enum hv_kvp_exchg_pool {
 176        KVP_POOL_EXTERNAL = 0,
 177        KVP_POOL_GUEST,
 178        KVP_POOL_AUTO,
 179        KVP_POOL_AUTO_EXTERNAL,
 180        KVP_POOL_AUTO_INTERNAL,
 181        KVP_POOL_COUNT /* Number of pools, must be last. */
 182};
 183
 184/*
 185 * Some Hyper-V status codes.
 186 */
 187
 188#define HV_S_OK                         0x00000000
 189#define HV_E_FAIL                       0x80004005
 190#define HV_S_CONT                       0x80070103
 191#define HV_ERROR_NOT_SUPPORTED          0x80070032
 192#define HV_ERROR_MACHINE_LOCKED         0x800704F7
 193#define HV_ERROR_DEVICE_NOT_CONNECTED   0x8007048F
 194#define HV_INVALIDARG                   0x80070057
 195#define HV_GUID_NOTFOUND                0x80041002
 196
 197#define ADDR_FAMILY_NONE        0x00
 198#define ADDR_FAMILY_IPV4        0x01
 199#define ADDR_FAMILY_IPV6        0x02
 200
 201#define MAX_ADAPTER_ID_SIZE     128
 202#define MAX_IP_ADDR_SIZE        1024
 203#define MAX_GATEWAY_SIZE        512
 204
 205
 206struct hv_kvp_ipaddr_value {
 207        __u16   adapter_id[MAX_ADAPTER_ID_SIZE];
 208        __u8    addr_family;
 209        __u8    dhcp_enabled;
 210        __u16   ip_addr[MAX_IP_ADDR_SIZE];
 211        __u16   sub_net[MAX_IP_ADDR_SIZE];
 212        __u16   gate_way[MAX_GATEWAY_SIZE];
 213        __u16   dns_addr[MAX_IP_ADDR_SIZE];
 214} __attribute__((packed));
 215
 216
 217struct hv_kvp_hdr {
 218        __u8 operation;
 219        __u8 pool;
 220        __u16 pad;
 221} __attribute__((packed));
 222
 223struct hv_kvp_exchg_msg_value {
 224        __u32 value_type;
 225        __u32 key_size;
 226        __u32 value_size;
 227        __u8 key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 228        union {
 229                __u8 value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
 230                __u32 value_u32;
 231                __u64 value_u64;
 232        };
 233} __attribute__((packed));
 234
 235struct hv_kvp_msg_enumerate {
 236        __u32 index;
 237        struct hv_kvp_exchg_msg_value data;
 238} __attribute__((packed));
 239
 240struct hv_kvp_msg_get {
 241        struct hv_kvp_exchg_msg_value data;
 242};
 243
 244struct hv_kvp_msg_set {
 245        struct hv_kvp_exchg_msg_value data;
 246};
 247
 248struct hv_kvp_msg_delete {
 249        __u32 key_size;
 250        __u8 key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 251};
 252
 253struct hv_kvp_register {
 254        __u8 version[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
 255};
 256
 257struct hv_kvp_msg {
 258        union {
 259                struct hv_kvp_hdr       kvp_hdr;
 260                int error;
 261        };
 262        union {
 263                struct hv_kvp_msg_get           kvp_get;
 264                struct hv_kvp_msg_set           kvp_set;
 265                struct hv_kvp_msg_delete        kvp_delete;
 266                struct hv_kvp_msg_enumerate     kvp_enum_data;
 267                struct hv_kvp_ipaddr_value      kvp_ip_val;
 268                struct hv_kvp_register          kvp_register;
 269        } body;
 270} __attribute__((packed));
 271
 272struct hv_kvp_ip_msg {
 273        __u8 operation;
 274        __u8 pool;
 275        struct hv_kvp_ipaddr_value      kvp_ip_val;
 276} __attribute__((packed));
 277
 278#ifdef __KERNEL__
 279#include <linux/scatterlist.h>
 280#include <linux/list.h>
 281#include <linux/uuid.h>
 282#include <linux/timer.h>
 283#include <linux/workqueue.h>
 284#include <linux/completion.h>
 285#include <linux/device.h>
 286#include <linux/mod_devicetable.h>
 287
 288
 289#define MAX_PAGE_BUFFER_COUNT                           19
 290#define MAX_MULTIPAGE_BUFFER_COUNT                      32 /* 128K */
 291
 292#pragma pack(push, 1)
 293
 294/* Single-page buffer */
 295struct hv_page_buffer {
 296        u32 len;
 297        u32 offset;
 298        u64 pfn;
 299};
 300
 301/* Multiple-page buffer */
 302struct hv_multipage_buffer {
 303        /* Length and Offset determines the # of pfns in the array */
 304        u32 len;
 305        u32 offset;
 306        u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT];
 307};
 308
 309/* 0x18 includes the proprietary packet header */
 310#define MAX_PAGE_BUFFER_PACKET          (0x18 +                 \
 311                                        (sizeof(struct hv_page_buffer) * \
 312                                         MAX_PAGE_BUFFER_COUNT))
 313#define MAX_MULTIPAGE_BUFFER_PACKET     (0x18 +                 \
 314                                         sizeof(struct hv_multipage_buffer))
 315
 316
 317#pragma pack(pop)
 318
 319struct hv_ring_buffer {
 320        /* Offset in bytes from the start of ring data below */
 321        u32 write_index;
 322
 323        /* Offset in bytes from the start of ring data below */
 324        u32 read_index;
 325
 326        u32 interrupt_mask;
 327
 328        /*
 329         * Win8 uses some of the reserved bits to implement
 330         * interrupt driven flow management. On the send side
 331         * we can request that the receiver interrupt the sender
 332         * when the ring transitions from being full to being able
 333         * to handle a message of size "pending_send_sz".
 334         *
 335         * Add necessary state for this enhancement.
 336         */
 337        u32 pending_send_sz;
 338
 339        u32 reserved1[12];
 340
 341        union {
 342                struct {
 343                        u32 feat_pending_send_sz:1;
 344                };
 345                u32 value;
 346        } feature_bits;
 347
 348        /* Pad it to PAGE_SIZE so that data starts on page boundary */
 349        u8      reserved2[4028];
 350
 351        /*
 352         * Ring data starts here + RingDataStartOffset
 353         * !!! DO NOT place any fields below this !!!
 354         */
 355        u8 buffer[0];
 356} __packed;
 357
 358struct hv_ring_buffer_info {
 359        struct hv_ring_buffer *ring_buffer;
 360        u32 ring_size;                  /* Include the shared header */
 361        spinlock_t ring_lock;
 362
 363        u32 ring_datasize;              /* < ring_size */
 364        u32 ring_data_startoffset;
 365};
 366
 367struct hv_ring_buffer_debug_info {
 368        u32 current_interrupt_mask;
 369        u32 current_read_index;
 370        u32 current_write_index;
 371        u32 bytes_avail_toread;
 372        u32 bytes_avail_towrite;
 373};
 374
 375
 376/*
 377 *
 378 * hv_get_ringbuffer_availbytes()
 379 *
 380 * Get number of bytes available to read and to write to
 381 * for the specified ring buffer
 382 */
 383static inline void
 384hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
 385                          u32 *read, u32 *write)
 386{
 387        u32 read_loc, write_loc, dsize;
 388
 389        smp_read_barrier_depends();
 390
 391        /* Capture the read/write indices before they changed */
 392        read_loc = rbi->ring_buffer->read_index;
 393        write_loc = rbi->ring_buffer->write_index;
 394        dsize = rbi->ring_datasize;
 395
 396        *write = write_loc >= read_loc ? dsize - (write_loc - read_loc) :
 397                read_loc - write_loc;
 398        *read = dsize - *write;
 399}
 400
 401
 402/*
 403 * We use the same version numbering for all Hyper-V modules.
 404 *
 405 * Definition of versioning is as follows;
 406 *
 407 *      Major Number    Changes for these scenarios;
 408 *                      1.      When a new version of Windows Hyper-V
 409 *                              is released.
 410 *                      2.      A Major change has occurred in the
 411 *                              Linux IC's.
 412 *                      (For example the merge for the first time
 413 *                      into the kernel) Every time the Major Number
 414 *                      changes, the Revision number is reset to 0.
 415 *      Minor Number    Changes when new functionality is added
 416 *                      to the Linux IC's that is not a bug fix.
 417 *
 418 * 3.1 - Added completed hv_utils driver. Shutdown/Heartbeat/Timesync
 419 */
 420#define HV_DRV_VERSION           "3.1"
 421
 422/*
 423 * VMBUS version is 32 bit entity broken up into
 424 * two 16 bit quantities: major_number. minor_number.
 425 *
 426 * 0 . 13 (Windows Server 2008)
 427 * 1 . 1  (Windows 7)
 428 * 2 . 4  (Windows 8)
 429 */
 430
 431#define VERSION_WS2008  ((0 << 16) | (13))
 432#define VERSION_WIN7    ((1 << 16) | (1))
 433#define VERSION_WIN8    ((2 << 16) | (4))
 434
 435#define VERSION_INVAL -1
 436
 437#define VERSION_CURRENT VERSION_WIN8
 438
 439/* Make maximum size of pipe payload of 16K */
 440#define MAX_PIPE_DATA_PAYLOAD           (sizeof(u8) * 16384)
 441
 442/* Define PipeMode values. */
 443#define VMBUS_PIPE_TYPE_BYTE            0x00000000
 444#define VMBUS_PIPE_TYPE_MESSAGE         0x00000004
 445
 446/* The size of the user defined data buffer for non-pipe offers. */
 447#define MAX_USER_DEFINED_BYTES          120
 448
 449/* The size of the user defined data buffer for pipe offers. */
 450#define MAX_PIPE_USER_DEFINED_BYTES     116
 451
 452/*
 453 * At the center of the Channel Management library is the Channel Offer. This
 454 * struct contains the fundamental information about an offer.
 455 */
 456struct vmbus_channel_offer {
 457        uuid_le if_type;
 458        uuid_le if_instance;
 459
 460        /*
 461         * These two fields are not currently used.
 462         */
 463        u64 reserved1;
 464        u64 reserved2;
 465
 466        u16 chn_flags;
 467        u16 mmio_megabytes;             /* in bytes * 1024 * 1024 */
 468
 469        union {
 470                /* Non-pipes: The user has MAX_USER_DEFINED_BYTES bytes. */
 471                struct {
 472                        unsigned char user_def[MAX_USER_DEFINED_BYTES];
 473                } std;
 474
 475                /*
 476                 * Pipes:
 477                 * The following sructure is an integrated pipe protocol, which
 478                 * is implemented on top of standard user-defined data. Pipe
 479                 * clients have MAX_PIPE_USER_DEFINED_BYTES left for their own
 480                 * use.
 481                 */
 482                struct {
 483                        u32  pipe_mode;
 484                        unsigned char user_def[MAX_PIPE_USER_DEFINED_BYTES];
 485                } pipe;
 486        } u;
 487        /*
 488         * The sub_channel_index is defined in win8.
 489         */
 490        u16 sub_channel_index;
 491        u16 reserved3;
 492} __packed;
 493
 494/* Server Flags */
 495#define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE        1
 496#define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES    2
 497#define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS            4
 498#define VMBUS_CHANNEL_NAMED_PIPE_MODE                   0x10
 499#define VMBUS_CHANNEL_LOOPBACK_OFFER                    0x100
 500#define VMBUS_CHANNEL_PARENT_OFFER                      0x200
 501#define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION    0x400
 502
 503struct vmpacket_descriptor {
 504        u16 type;
 505        u16 offset8;
 506        u16 len8;
 507        u16 flags;
 508        u64 trans_id;
 509} __packed;
 510
 511struct vmpacket_header {
 512        u32 prev_pkt_start_offset;
 513        struct vmpacket_descriptor descriptor;
 514} __packed;
 515
 516struct vmtransfer_page_range {
 517        u32 byte_count;
 518        u32 byte_offset;
 519} __packed;
 520
 521struct vmtransfer_page_packet_header {
 522        struct vmpacket_descriptor d;
 523        u16 xfer_pageset_id;
 524        u8  sender_owns_set;
 525        u8 reserved;
 526        u32 range_cnt;
 527        struct vmtransfer_page_range ranges[1];
 528} __packed;
 529
 530struct vmgpadl_packet_header {
 531        struct vmpacket_descriptor d;
 532        u32 gpadl;
 533        u32 reserved;
 534} __packed;
 535
 536struct vmadd_remove_transfer_page_set {
 537        struct vmpacket_descriptor d;
 538        u32 gpadl;
 539        u16 xfer_pageset_id;
 540        u16 reserved;
 541} __packed;
 542
 543/*
 544 * This structure defines a range in guest physical space that can be made to
 545 * look virtually contiguous.
 546 */
 547struct gpa_range {
 548        u32 byte_count;
 549        u32 byte_offset;
 550        u64 pfn_array[0];
 551};
 552
 553/*
 554 * This is the format for an Establish Gpadl packet, which contains a handle by
 555 * which this GPADL will be known and a set of GPA ranges associated with it.
 556 * This can be converted to a MDL by the guest OS.  If there are multiple GPA
 557 * ranges, then the resulting MDL will be "chained," representing multiple VA
 558 * ranges.
 559 */
 560struct vmestablish_gpadl {
 561        struct vmpacket_descriptor d;
 562        u32 gpadl;
 563        u32 range_cnt;
 564        struct gpa_range range[1];
 565} __packed;
 566
 567/*
 568 * This is the format for a Teardown Gpadl packet, which indicates that the
 569 * GPADL handle in the Establish Gpadl packet will never be referenced again.
 570 */
 571struct vmteardown_gpadl {
 572        struct vmpacket_descriptor d;
 573        u32 gpadl;
 574        u32 reserved;   /* for alignment to a 8-byte boundary */
 575} __packed;
 576
 577/*
 578 * This is the format for a GPA-Direct packet, which contains a set of GPA
 579 * ranges, in addition to commands and/or data.
 580 */
 581struct vmdata_gpa_direct {
 582        struct vmpacket_descriptor d;
 583        u32 reserved;
 584        u32 range_cnt;
 585        struct gpa_range range[1];
 586} __packed;
 587
 588/* This is the format for a Additional Data Packet. */
 589struct vmadditional_data {
 590        struct vmpacket_descriptor d;
 591        u64 total_bytes;
 592        u32 offset;
 593        u32 byte_cnt;
 594        unsigned char data[1];
 595} __packed;
 596
 597union vmpacket_largest_possible_header {
 598        struct vmpacket_descriptor simple_hdr;
 599        struct vmtransfer_page_packet_header xfer_page_hdr;
 600        struct vmgpadl_packet_header gpadl_hdr;
 601        struct vmadd_remove_transfer_page_set add_rm_xfer_page_hdr;
 602        struct vmestablish_gpadl establish_gpadl_hdr;
 603        struct vmteardown_gpadl teardown_gpadl_hdr;
 604        struct vmdata_gpa_direct data_gpa_direct_hdr;
 605};
 606
 607#define VMPACKET_DATA_START_ADDRESS(__packet)   \
 608        (void *)(((unsigned char *)__packet) +  \
 609         ((struct vmpacket_descriptor)__packet)->offset8 * 8)
 610
 611#define VMPACKET_DATA_LENGTH(__packet)          \
 612        ((((struct vmpacket_descriptor)__packet)->len8 -        \
 613          ((struct vmpacket_descriptor)__packet)->offset8) * 8)
 614
 615#define VMPACKET_TRANSFER_MODE(__packet)        \
 616        (((struct IMPACT)__packet)->type)
 617
 618enum vmbus_packet_type {
 619        VM_PKT_INVALID                          = 0x0,
 620        VM_PKT_SYNCH                            = 0x1,
 621        VM_PKT_ADD_XFER_PAGESET                 = 0x2,
 622        VM_PKT_RM_XFER_PAGESET                  = 0x3,
 623        VM_PKT_ESTABLISH_GPADL                  = 0x4,
 624        VM_PKT_TEARDOWN_GPADL                   = 0x5,
 625        VM_PKT_DATA_INBAND                      = 0x6,
 626        VM_PKT_DATA_USING_XFER_PAGES            = 0x7,
 627        VM_PKT_DATA_USING_GPADL                 = 0x8,
 628        VM_PKT_DATA_USING_GPA_DIRECT            = 0x9,
 629        VM_PKT_CANCEL_REQUEST                   = 0xa,
 630        VM_PKT_COMP                             = 0xb,
 631        VM_PKT_DATA_USING_ADDITIONAL_PKT        = 0xc,
 632        VM_PKT_ADDITIONAL_DATA                  = 0xd
 633};
 634
 635#define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED     1
 636
 637
 638/* Version 1 messages */
 639enum vmbus_channel_message_type {
 640        CHANNELMSG_INVALID                      =  0,
 641        CHANNELMSG_OFFERCHANNEL         =  1,
 642        CHANNELMSG_RESCIND_CHANNELOFFER =  2,
 643        CHANNELMSG_REQUESTOFFERS                =  3,
 644        CHANNELMSG_ALLOFFERS_DELIVERED  =  4,
 645        CHANNELMSG_OPENCHANNEL          =  5,
 646        CHANNELMSG_OPENCHANNEL_RESULT           =  6,
 647        CHANNELMSG_CLOSECHANNEL         =  7,
 648        CHANNELMSG_GPADL_HEADER         =  8,
 649        CHANNELMSG_GPADL_BODY                   =  9,
 650        CHANNELMSG_GPADL_CREATED                = 10,
 651        CHANNELMSG_GPADL_TEARDOWN               = 11,
 652        CHANNELMSG_GPADL_TORNDOWN               = 12,
 653        CHANNELMSG_RELID_RELEASED               = 13,
 654        CHANNELMSG_INITIATE_CONTACT             = 14,
 655        CHANNELMSG_VERSION_RESPONSE             = 15,
 656        CHANNELMSG_UNLOAD                       = 16,
 657#ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
 658        CHANNELMSG_VIEWRANGE_ADD                = 17,
 659        CHANNELMSG_VIEWRANGE_REMOVE             = 18,
 660#endif
 661        CHANNELMSG_COUNT
 662};
 663
 664struct vmbus_channel_message_header {
 665        enum vmbus_channel_message_type msgtype;
 666        u32 padding;
 667} __packed;
 668
 669/* Query VMBus Version parameters */
 670struct vmbus_channel_query_vmbus_version {
 671        struct vmbus_channel_message_header header;
 672        u32 version;
 673} __packed;
 674
 675/* VMBus Version Supported parameters */
 676struct vmbus_channel_version_supported {
 677        struct vmbus_channel_message_header header;
 678        u8 version_supported;
 679} __packed;
 680
 681/* Offer Channel parameters */
 682struct vmbus_channel_offer_channel {
 683        struct vmbus_channel_message_header header;
 684        struct vmbus_channel_offer offer;
 685        u32 child_relid;
 686        u8 monitorid;
 687        /*
 688         * win7 and beyond splits this field into a bit field.
 689         */
 690        u8 monitor_allocated:1;
 691        u8 reserved:7;
 692        /*
 693         * These are new fields added in win7 and later.
 694         * Do not access these fields without checking the
 695         * negotiated protocol.
 696         *
 697         * If "is_dedicated_interrupt" is set, we must not set the
 698         * associated bit in the channel bitmap while sending the
 699         * interrupt to the host.
 700         *
 701         * connection_id is to be used in signaling the host.
 702         */
 703        u16 is_dedicated_interrupt:1;
 704        u16 reserved1:15;
 705        u32 connection_id;
 706} __packed;
 707
 708/* Rescind Offer parameters */
 709struct vmbus_channel_rescind_offer {
 710        struct vmbus_channel_message_header header;
 711        u32 child_relid;
 712} __packed;
 713
 714/*
 715 * Request Offer -- no parameters, SynIC message contains the partition ID
 716 * Set Snoop -- no parameters, SynIC message contains the partition ID
 717 * Clear Snoop -- no parameters, SynIC message contains the partition ID
 718 * All Offers Delivered -- no parameters, SynIC message contains the partition
 719 *                         ID
 720 * Flush Client -- no parameters, SynIC message contains the partition ID
 721 */
 722
 723/* Open Channel parameters */
 724struct vmbus_channel_open_channel {
 725        struct vmbus_channel_message_header header;
 726
 727        /* Identifies the specific VMBus channel that is being opened. */
 728        u32 child_relid;
 729
 730        /* ID making a particular open request at a channel offer unique. */
 731        u32 openid;
 732
 733        /* GPADL for the channel's ring buffer. */
 734        u32 ringbuffer_gpadlhandle;
 735
 736        /*
 737         * Starting with win8, this field will be used to specify
 738         * the target virtual processor on which to deliver the interrupt for
 739         * the host to guest communication.
 740         * Prior to win8, incoming channel interrupts would only
 741         * be delivered on cpu 0. Setting this value to 0 would
 742         * preserve the earlier behavior.
 743         */
 744        u32 target_vp;
 745
 746        /*
 747        * The upstream ring buffer begins at offset zero in the memory
 748        * described by RingBufferGpadlHandle. The downstream ring buffer
 749        * follows it at this offset (in pages).
 750        */
 751        u32 downstream_ringbuffer_pageoffset;
 752
 753        /* User-specific data to be passed along to the server endpoint. */
 754        unsigned char userdata[MAX_USER_DEFINED_BYTES];
 755} __packed;
 756
 757/* Open Channel Result parameters */
 758struct vmbus_channel_open_result {
 759        struct vmbus_channel_message_header header;
 760        u32 child_relid;
 761        u32 openid;
 762        u32 status;
 763} __packed;
 764
 765/* Close channel parameters; */
 766struct vmbus_channel_close_channel {
 767        struct vmbus_channel_message_header header;
 768        u32 child_relid;
 769} __packed;
 770
 771/* Channel Message GPADL */
 772#define GPADL_TYPE_RING_BUFFER          1
 773#define GPADL_TYPE_SERVER_SAVE_AREA     2
 774#define GPADL_TYPE_TRANSACTION          8
 775
 776/*
 777 * The number of PFNs in a GPADL message is defined by the number of
 778 * pages that would be spanned by ByteCount and ByteOffset.  If the
 779 * implied number of PFNs won't fit in this packet, there will be a
 780 * follow-up packet that contains more.
 781 */
 782struct vmbus_channel_gpadl_header {
 783        struct vmbus_channel_message_header header;
 784        u32 child_relid;
 785        u32 gpadl;
 786        u16 range_buflen;
 787        u16 rangecount;
 788        struct gpa_range range[0];
 789} __packed;
 790
 791/* This is the followup packet that contains more PFNs. */
 792struct vmbus_channel_gpadl_body {
 793        struct vmbus_channel_message_header header;
 794        u32 msgnumber;
 795        u32 gpadl;
 796        u64 pfn[0];
 797} __packed;
 798
 799struct vmbus_channel_gpadl_created {
 800        struct vmbus_channel_message_header header;
 801        u32 child_relid;
 802        u32 gpadl;
 803        u32 creation_status;
 804} __packed;
 805
 806struct vmbus_channel_gpadl_teardown {
 807        struct vmbus_channel_message_header header;
 808        u32 child_relid;
 809        u32 gpadl;
 810} __packed;
 811
 812struct vmbus_channel_gpadl_torndown {
 813        struct vmbus_channel_message_header header;
 814        u32 gpadl;
 815} __packed;
 816
 817#ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
 818struct vmbus_channel_view_range_add {
 819        struct vmbus_channel_message_header header;
 820        PHYSICAL_ADDRESS viewrange_base;
 821        u64 viewrange_length;
 822        u32 child_relid;
 823} __packed;
 824
 825struct vmbus_channel_view_range_remove {
 826        struct vmbus_channel_message_header header;
 827        PHYSICAL_ADDRESS viewrange_base;
 828        u32 child_relid;
 829} __packed;
 830#endif
 831
 832struct vmbus_channel_relid_released {
 833        struct vmbus_channel_message_header header;
 834        u32 child_relid;
 835} __packed;
 836
 837struct vmbus_channel_initiate_contact {
 838        struct vmbus_channel_message_header header;
 839        u32 vmbus_version_requested;
 840        u32 padding2;
 841        u64 interrupt_page;
 842        u64 monitor_page1;
 843        u64 monitor_page2;
 844} __packed;
 845
 846struct vmbus_channel_version_response {
 847        struct vmbus_channel_message_header header;
 848        u8 version_supported;
 849} __packed;
 850
 851enum vmbus_channel_state {
 852        CHANNEL_OFFER_STATE,
 853        CHANNEL_OPENING_STATE,
 854        CHANNEL_OPEN_STATE,
 855};
 856
 857struct vmbus_channel_debug_info {
 858        u32 relid;
 859        enum vmbus_channel_state state;
 860        uuid_le interfacetype;
 861        uuid_le interface_instance;
 862        u32 monitorid;
 863        u32 servermonitor_pending;
 864        u32 servermonitor_latency;
 865        u32 servermonitor_connectionid;
 866        u32 clientmonitor_pending;
 867        u32 clientmonitor_latency;
 868        u32 clientmonitor_connectionid;
 869
 870        struct hv_ring_buffer_debug_info inbound;
 871        struct hv_ring_buffer_debug_info outbound;
 872};
 873
 874/*
 875 * Represents each channel msg on the vmbus connection This is a
 876 * variable-size data structure depending on the msg type itself
 877 */
 878struct vmbus_channel_msginfo {
 879        /* Bookkeeping stuff */
 880        struct list_head msglistentry;
 881
 882        /* So far, this is only used to handle gpadl body message */
 883        struct list_head submsglist;
 884
 885        /* Synchronize the request/response if needed */
 886        struct completion  waitevent;
 887        union {
 888                struct vmbus_channel_version_supported version_supported;
 889                struct vmbus_channel_open_result open_result;
 890                struct vmbus_channel_gpadl_torndown gpadl_torndown;
 891                struct vmbus_channel_gpadl_created gpadl_created;
 892                struct vmbus_channel_version_response version_response;
 893        } response;
 894
 895        u32 msgsize;
 896        /*
 897         * The channel message that goes out on the "wire".
 898         * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
 899         */
 900        unsigned char msg[0];
 901};
 902
 903struct vmbus_close_msg {
 904        struct vmbus_channel_msginfo info;
 905        struct vmbus_channel_close_channel msg;
 906};
 907
 908/* Define connection identifier type. */
 909union hv_connection_id {
 910        u32 asu32;
 911        struct {
 912                u32 id:24;
 913                u32 reserved:8;
 914        } u;
 915};
 916
 917/* Definition of the hv_signal_event hypercall input structure. */
 918struct hv_input_signal_event {
 919        union hv_connection_id connectionid;
 920        u16 flag_number;
 921        u16 rsvdz;
 922};
 923
 924struct hv_input_signal_event_buffer {
 925        u64 align8;
 926        struct hv_input_signal_event event;
 927};
 928
 929struct vmbus_channel {
 930        struct list_head listentry;
 931
 932        struct hv_device *device_obj;
 933
 934        struct work_struct work;
 935
 936        enum vmbus_channel_state state;
 937
 938        struct vmbus_channel_offer_channel offermsg;
 939        /*
 940         * These are based on the OfferMsg.MonitorId.
 941         * Save it here for easy access.
 942         */
 943        u8 monitor_grp;
 944        u8 monitor_bit;
 945
 946        u32 ringbuffer_gpadlhandle;
 947
 948        /* Allocated memory for ring buffer */
 949        void *ringbuffer_pages;
 950        u32 ringbuffer_pagecount;
 951        struct hv_ring_buffer_info outbound;    /* send to parent */
 952        struct hv_ring_buffer_info inbound;     /* receive from parent */
 953        spinlock_t inbound_lock;
 954        struct workqueue_struct *controlwq;
 955
 956        struct vmbus_close_msg close_msg;
 957
 958        /* Channel callback are invoked in this workqueue context */
 959        /* HANDLE dataWorkQueue; */
 960
 961        void (*onchannel_callback)(void *context);
 962        void *channel_callback_context;
 963
 964        /*
 965         * A channel can be marked for efficient (batched)
 966         * reading:
 967         * If batched_reading is set to "true", we read until the
 968         * channel is empty and hold off interrupts from the host
 969         * during the entire read process.
 970         * If batched_reading is set to "false", the client is not
 971         * going to perform batched reading.
 972         *
 973         * By default we will enable batched reading; specific
 974         * drivers that don't want this behavior can turn it off.
 975         */
 976
 977        bool batched_reading;
 978
 979        bool is_dedicated_interrupt;
 980        struct hv_input_signal_event_buffer sig_buf;
 981        struct hv_input_signal_event *sig_event;
 982
 983        /*
 984         * Starting with win8, this field will be used to specify
 985         * the target virtual processor on which to deliver the interrupt for
 986         * the host to guest communication.
 987         * Prior to win8, incoming channel interrupts would only
 988         * be delivered on cpu 0. Setting this value to 0 would
 989         * preserve the earlier behavior.
 990         */
 991        u32 target_vp;
 992};
 993
 994static inline void set_channel_read_state(struct vmbus_channel *c, bool state)
 995{
 996        c->batched_reading = state;
 997}
 998
 999void vmbus_onmessage(void *context);
1000
1001int vmbus_request_offers(void);
1002
1003/* The format must be the same as struct vmdata_gpa_direct */
1004struct vmbus_channel_packet_page_buffer {
1005        u16 type;
1006        u16 dataoffset8;
1007        u16 length8;
1008        u16 flags;
1009        u64 transactionid;
1010        u32 reserved;
1011        u32 rangecount;
1012        struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT];
1013} __packed;
1014
1015/* The format must be the same as struct vmdata_gpa_direct */
1016struct vmbus_channel_packet_multipage_buffer {
1017        u16 type;
1018        u16 dataoffset8;
1019        u16 length8;
1020        u16 flags;
1021        u64 transactionid;
1022        u32 reserved;
1023        u32 rangecount;         /* Always 1 in this case */
1024        struct hv_multipage_buffer range;
1025} __packed;
1026
1027
1028extern int vmbus_open(struct vmbus_channel *channel,
1029                            u32 send_ringbuffersize,
1030                            u32 recv_ringbuffersize,
1031                            void *userdata,
1032                            u32 userdatalen,
1033                            void(*onchannel_callback)(void *context),
1034                            void *context);
1035
1036extern void vmbus_close(struct vmbus_channel *channel);
1037
1038extern int vmbus_sendpacket(struct vmbus_channel *channel,
1039                                  const void *buffer,
1040                                  u32 bufferLen,
1041                                  u64 requestid,
1042                                  enum vmbus_packet_type type,
1043                                  u32 flags);
1044
1045extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
1046                                            struct hv_page_buffer pagebuffers[],
1047                                            u32 pagecount,
1048                                            void *buffer,
1049                                            u32 bufferlen,
1050                                            u64 requestid);
1051
1052extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
1053                                        struct hv_multipage_buffer *mpb,
1054                                        void *buffer,
1055                                        u32 bufferlen,
1056                                        u64 requestid);
1057
1058extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
1059                                      void *kbuffer,
1060                                      u32 size,
1061                                      u32 *gpadl_handle);
1062
1063extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
1064                                     u32 gpadl_handle);
1065
1066extern int vmbus_recvpacket(struct vmbus_channel *channel,
1067                                  void *buffer,
1068                                  u32 bufferlen,
1069                                  u32 *buffer_actual_len,
1070                                  u64 *requestid);
1071
1072extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
1073                                     void *buffer,
1074                                     u32 bufferlen,
1075                                     u32 *buffer_actual_len,
1076                                     u64 *requestid);
1077
1078
1079extern void vmbus_get_debug_info(struct vmbus_channel *channel,
1080                                     struct vmbus_channel_debug_info *debug);
1081
1082extern void vmbus_ontimer(unsigned long data);
1083
1084struct hv_dev_port_info {
1085        u32 int_mask;
1086        u32 read_idx;
1087        u32 write_idx;
1088        u32 bytes_avail_toread;
1089        u32 bytes_avail_towrite;
1090};
1091
1092/* Base driver object */
1093struct hv_driver {
1094        const char *name;
1095
1096        /* the device type supported by this driver */
1097        uuid_le dev_type;
1098        const struct hv_vmbus_device_id *id_table;
1099
1100        struct device_driver driver;
1101
1102        int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *);
1103        int (*remove)(struct hv_device *);
1104        void (*shutdown)(struct hv_device *);
1105
1106};
1107
1108/* Base device object */
1109struct hv_device {
1110        /* the device type id of this device */
1111        uuid_le dev_type;
1112
1113        /* the device instance id of this device */
1114        uuid_le dev_instance;
1115
1116        struct device device;
1117
1118        struct vmbus_channel *channel;
1119};
1120
1121
1122static inline struct hv_device *device_to_hv_device(struct device *d)
1123{
1124        return container_of(d, struct hv_device, device);
1125}
1126
1127static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d)
1128{
1129        return container_of(d, struct hv_driver, driver);
1130}
1131
1132static inline void hv_set_drvdata(struct hv_device *dev, void *data)
1133{
1134        dev_set_drvdata(&dev->device, data);
1135}
1136
1137static inline void *hv_get_drvdata(struct hv_device *dev)
1138{
1139        return dev_get_drvdata(&dev->device);
1140}
1141
1142/* Vmbus interface */
1143#define vmbus_driver_register(driver)   \
1144        __vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
1145int __must_check __vmbus_driver_register(struct hv_driver *hv_driver,
1146                                         struct module *owner,
1147                                         const char *mod_name);
1148void vmbus_driver_unregister(struct hv_driver *hv_driver);
1149
1150/**
1151 * VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device
1152 *
1153 * This macro is used to create a struct hv_vmbus_device_id that matches a
1154 * specific device.
1155 */
1156#define VMBUS_DEVICE(g0, g1, g2, g3, g4, g5, g6, g7,    \
1157                     g8, g9, ga, gb, gc, gd, ge, gf)    \
1158        .guid = { g0, g1, g2, g3, g4, g5, g6, g7,       \
1159                  g8, g9, ga, gb, gc, gd, ge, gf },
1160
1161/*
1162 * GUID definitions of various offer types - services offered to the guest.
1163 */
1164
1165/*
1166 * Network GUID
1167 * {f8615163-df3e-46c5-913f-f2d2f965ed0e}
1168 */
1169#define HV_NIC_GUID \
1170        .guid = { \
1171                        0x63, 0x51, 0x61, 0xf8, 0x3e, 0xdf, 0xc5, 0x46, \
1172                        0x91, 0x3f, 0xf2, 0xd2, 0xf9, 0x65, 0xed, 0x0e \
1173                }
1174
1175/*
1176 * IDE GUID
1177 * {32412632-86cb-44a2-9b5c-50d1417354f5}
1178 */
1179#define HV_IDE_GUID \
1180        .guid = { \
1181                        0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, \
1182                        0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5 \
1183                }
1184
1185/*
1186 * SCSI GUID
1187 * {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f}
1188 */
1189#define HV_SCSI_GUID \
1190        .guid = { \
1191                        0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, \
1192                        0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f \
1193                }
1194
1195/*
1196 * Shutdown GUID
1197 * {0e0b6031-5213-4934-818b-38d90ced39db}
1198 */
1199#define HV_SHUTDOWN_GUID \
1200        .guid = { \
1201                        0x31, 0x60, 0x0b, 0x0e, 0x13, 0x52, 0x34, 0x49, \
1202                        0x81, 0x8b, 0x38, 0xd9, 0x0c, 0xed, 0x39, 0xdb \
1203                }
1204
1205/*
1206 * Time Synch GUID
1207 * {9527E630-D0AE-497b-ADCE-E80AB0175CAF}
1208 */
1209#define HV_TS_GUID \
1210        .guid = { \
1211                        0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49, \
1212                        0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf \
1213                }
1214
1215/*
1216 * Heartbeat GUID
1217 * {57164f39-9115-4e78-ab55-382f3bd5422d}
1218 */
1219#define HV_HEART_BEAT_GUID \
1220        .guid = { \
1221                        0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e, \
1222                        0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d \
1223                }
1224
1225/*
1226 * KVP GUID
1227 * {a9a0f4e7-5a45-4d96-b827-8a841e8c03e6}
1228 */
1229#define HV_KVP_GUID \
1230        .guid = { \
1231                        0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d, \
1232                        0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3,  0xe6 \
1233                }
1234
1235/*
1236 * Dynamic memory GUID
1237 * {525074dc-8985-46e2-8057-a307dc18a502}
1238 */
1239#define HV_DM_GUID \
1240        .guid = { \
1241                        0xdc, 0x74, 0x50, 0X52, 0x85, 0x89, 0xe2, 0x46, \
1242                        0x80, 0x57, 0xa3, 0x07, 0xdc, 0x18, 0xa5, 0x02 \
1243                }
1244
1245/*
1246 * Mouse GUID
1247 * {cfa8b69e-5b4a-4cc0-b98b-8ba1a1f3f95a}
1248 */
1249#define HV_MOUSE_GUID \
1250        .guid = { \
1251                        0x9e, 0xb6, 0xa8, 0xcf, 0x4a, 0x5b, 0xc0, 0x4c, \
1252                        0xb9, 0x8b, 0x8b, 0xa1, 0xa1, 0xf3, 0xf9, 0x5a \
1253                }
1254
1255/*
1256 * Common header for Hyper-V ICs
1257 */
1258
1259#define ICMSGTYPE_NEGOTIATE             0
1260#define ICMSGTYPE_HEARTBEAT             1
1261#define ICMSGTYPE_KVPEXCHANGE           2
1262#define ICMSGTYPE_SHUTDOWN              3
1263#define ICMSGTYPE_TIMESYNC              4
1264#define ICMSGTYPE_VSS                   5
1265
1266#define ICMSGHDRFLAG_TRANSACTION        1
1267#define ICMSGHDRFLAG_REQUEST            2
1268#define ICMSGHDRFLAG_RESPONSE           4
1269
1270
1271/*
1272 * While we want to handle util services as regular devices,
1273 * there is only one instance of each of these services; so
1274 * we statically allocate the service specific state.
1275 */
1276
1277struct hv_util_service {
1278        u8 *recv_buffer;
1279        void (*util_cb)(void *);
1280        int (*util_init)(struct hv_util_service *);
1281        void (*util_deinit)(void);
1282};
1283
1284struct vmbuspipe_hdr {
1285        u32 flags;
1286        u32 msgsize;
1287} __packed;
1288
1289struct ic_version {
1290        u16 major;
1291        u16 minor;
1292} __packed;
1293
1294struct icmsg_hdr {
1295        struct ic_version icverframe;
1296        u16 icmsgtype;
1297        struct ic_version icvermsg;
1298        u16 icmsgsize;
1299        u32 status;
1300        u8 ictransaction_id;
1301        u8 icflags;
1302        u8 reserved[2];
1303} __packed;
1304
1305struct icmsg_negotiate {
1306        u16 icframe_vercnt;
1307        u16 icmsg_vercnt;
1308        u32 reserved;
1309        struct ic_version icversion_data[1]; /* any size array */
1310} __packed;
1311
1312struct shutdown_msg_data {
1313        u32 reason_code;
1314        u32 timeout_seconds;
1315        u32 flags;
1316        u8  display_message[2048];
1317} __packed;
1318
1319struct heartbeat_msg_data {
1320        u64 seq_num;
1321        u32 reserved[8];
1322} __packed;
1323
1324/* Time Sync IC defs */
1325#define ICTIMESYNCFLAG_PROBE    0
1326#define ICTIMESYNCFLAG_SYNC     1
1327#define ICTIMESYNCFLAG_SAMPLE   2
1328
1329#ifdef __x86_64__
1330#define WLTIMEDELTA     116444736000000000L     /* in 100ns unit */
1331#else
1332#define WLTIMEDELTA     116444736000000000LL
1333#endif
1334
1335struct ictimesync_data {
1336        u64 parenttime;
1337        u64 childtime;
1338        u64 roundtriptime;
1339        u8 flags;
1340} __packed;
1341
1342struct hyperv_service_callback {
1343        u8 msg_type;
1344        char *log_msg;
1345        uuid_le data;
1346        struct vmbus_channel *channel;
1347        void (*callback) (void *context);
1348};
1349
1350#define MAX_SRV_VER     0x7ffffff
1351extern void vmbus_prep_negotiate_resp(struct icmsg_hdr *,
1352                                        struct icmsg_negotiate *, u8 *, int,
1353                                        int);
1354
1355int hv_kvp_init(struct hv_util_service *);
1356void hv_kvp_deinit(void);
1357void hv_kvp_onchannelcallback(void *);
1358
1359/*
1360 * Negotiated version with the Host.
1361 */
1362
1363extern __u32 vmbus_proto_version;
1364
1365#endif /* __KERNEL__ */
1366#endif /* _HYPERV_H */
1367
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