3 * Copyright (c) 2011, Microsoft Corporation.
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.
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
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.
19 * Haiyang Zhang <haiyangz@microsoft.com>
20 * Hank Janssen <hjanssen@microsoft.com>
21 * K. Y. Srinivasan <kys@microsoft.com>
28 #include <linux/scatterlist.h>
29 #include <linux/list.h>
30 #include <linux/timer.h>
31 #include <linux/workqueue.h>
32 #include <linux/completion.h>
33 #include <linux/device.h>
36 #include <asm/hyperv.h>
39 unsigned char data[16];
42 #define MAX_PAGE_BUFFER_COUNT 16
43 #define MAX_MULTIPAGE_BUFFER_COUNT 32 /* 128K */
47 /* Single-page buffer */
48 struct hv_page_buffer {
54 /* Multiple-page buffer */
55 struct hv_multipage_buffer {
56 /* Length and Offset determines the # of pfns in the array */
59 u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT];
62 /* 0x18 includes the proprietary packet header */
63 #define MAX_PAGE_BUFFER_PACKET (0x18 + \
64 (sizeof(struct hv_page_buffer) * \
65 MAX_PAGE_BUFFER_COUNT))
66 #define MAX_MULTIPAGE_BUFFER_PACKET (0x18 + \
67 sizeof(struct hv_multipage_buffer))
72 struct hv_ring_buffer {
73 /* Offset in bytes from the start of ring data below */
76 /* Offset in bytes from the start of ring data below */
81 /* Pad it to PAGE_SIZE so that data starts on page boundary */
85 * The interrupt_mask field is used only for channels but since our
86 * vmbus connection also uses this data structure and its data starts
87 * here, we commented out this field.
91 * Ring data starts here + RingDataStartOffset
92 * !!! DO NOT place any fields below this !!!
97 struct hv_ring_buffer_info {
98 struct hv_ring_buffer *ring_buffer;
99 u32 ring_size; /* Include the shared header */
100 spinlock_t ring_lock;
102 u32 ring_datasize; /* < ring_size */
103 u32 ring_data_startoffset;
106 struct hv_ring_buffer_debug_info {
107 u32 current_interrupt_mask;
108 u32 current_read_index;
109 u32 current_write_index;
110 u32 bytes_avail_toread;
111 u32 bytes_avail_towrite;
115 * We use the same version numbering for all Hyper-V modules.
117 * Definition of versioning is as follows;
119 * Major Number Changes for these scenarios;
120 * 1. When a new version of Windows Hyper-V
122 * 2. A Major change has occurred in the
124 * (For example the merge for the first time
125 * into the kernel) Every time the Major Number
126 * changes, the Revision number is reset to 0.
127 * Minor Number Changes when new functionality is added
128 * to the Linux IC's that is not a bug fix.
130 * 3.1 - Added completed hv_utils driver. Shutdown/Heartbeat/Timesync
132 #define HV_DRV_VERSION "3.1"
136 * A revision number of vmbus that is used for ensuring both ends on a
137 * partition are using compatible versions.
139 #define VMBUS_REVISION_NUMBER 13
141 /* Make maximum size of pipe payload of 16K */
142 #define MAX_PIPE_DATA_PAYLOAD (sizeof(u8) * 16384)
144 /* Define PipeMode values. */
145 #define VMBUS_PIPE_TYPE_BYTE 0x00000000
146 #define VMBUS_PIPE_TYPE_MESSAGE 0x00000004
148 /* The size of the user defined data buffer for non-pipe offers. */
149 #define MAX_USER_DEFINED_BYTES 120
151 /* The size of the user defined data buffer for pipe offers. */
152 #define MAX_PIPE_USER_DEFINED_BYTES 116
155 * At the center of the Channel Management library is the Channel Offer. This
156 * struct contains the fundamental information about an offer.
158 struct vmbus_channel_offer {
159 struct hv_guid if_type;
160 struct hv_guid if_instance;
161 u64 int_latency; /* in 100ns units */
163 u32 server_ctx_size; /* in bytes */
165 u16 mmio_megabytes; /* in bytes * 1024 * 1024 */
168 /* Non-pipes: The user has MAX_USER_DEFINED_BYTES bytes. */
170 unsigned char user_def[MAX_USER_DEFINED_BYTES];
175 * The following sructure is an integrated pipe protocol, which
176 * is implemented on top of standard user-defined data. Pipe
177 * clients have MAX_PIPE_USER_DEFINED_BYTES left for their own
182 unsigned char user_def[MAX_PIPE_USER_DEFINED_BYTES];
189 #define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE 1
190 #define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES 2
191 #define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS 4
192 #define VMBUS_CHANNEL_NAMED_PIPE_MODE 0x10
193 #define VMBUS_CHANNEL_LOOPBACK_OFFER 0x100
194 #define VMBUS_CHANNEL_PARENT_OFFER 0x200
195 #define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION 0x400
197 struct vmpacket_descriptor {
205 struct vmpacket_header {
206 u32 prev_pkt_start_offset;
207 struct vmpacket_descriptor descriptor;
210 struct vmtransfer_page_range {
215 struct vmtransfer_page_packet_header {
216 struct vmpacket_descriptor d;
218 bool sender_owns_set;
221 struct vmtransfer_page_range ranges[1];
224 struct vmgpadl_packet_header {
225 struct vmpacket_descriptor d;
230 struct vmadd_remove_transfer_page_set {
231 struct vmpacket_descriptor d;
238 * This structure defines a range in guest physical space that can be made to
239 * look virtually contiguous.
248 * This is the format for an Establish Gpadl packet, which contains a handle by
249 * which this GPADL will be known and a set of GPA ranges associated with it.
250 * This can be converted to a MDL by the guest OS. If there are multiple GPA
251 * ranges, then the resulting MDL will be "chained," representing multiple VA
254 struct vmestablish_gpadl {
255 struct vmpacket_descriptor d;
258 struct gpa_range range[1];
262 * This is the format for a Teardown Gpadl packet, which indicates that the
263 * GPADL handle in the Establish Gpadl packet will never be referenced again.
265 struct vmteardown_gpadl {
266 struct vmpacket_descriptor d;
268 u32 reserved; /* for alignment to a 8-byte boundary */
272 * This is the format for a GPA-Direct packet, which contains a set of GPA
273 * ranges, in addition to commands and/or data.
275 struct vmdata_gpa_direct {
276 struct vmpacket_descriptor d;
279 struct gpa_range range[1];
282 /* This is the format for a Additional Data Packet. */
283 struct vmadditional_data {
284 struct vmpacket_descriptor d;
288 unsigned char data[1];
291 union vmpacket_largest_possible_header {
292 struct vmpacket_descriptor simple_hdr;
293 struct vmtransfer_page_packet_header xfer_page_hdr;
294 struct vmgpadl_packet_header gpadl_hdr;
295 struct vmadd_remove_transfer_page_set add_rm_xfer_page_hdr;
296 struct vmestablish_gpadl establish_gpadl_hdr;
297 struct vmteardown_gpadl teardown_gpadl_hdr;
298 struct vmdata_gpa_direct data_gpa_direct_hdr;
301 #define VMPACKET_DATA_START_ADDRESS(__packet) \
302 (void *)(((unsigned char *)__packet) + \
303 ((struct vmpacket_descriptor)__packet)->offset8 * 8)
305 #define VMPACKET_DATA_LENGTH(__packet) \
306 ((((struct vmpacket_descriptor)__packet)->len8 - \
307 ((struct vmpacket_descriptor)__packet)->offset8) * 8)
309 #define VMPACKET_TRANSFER_MODE(__packet) \
310 (((struct IMPACT)__packet)->type)
312 enum vmbus_packet_type {
313 VM_PKT_INVALID = 0x0,
315 VM_PKT_ADD_XFER_PAGESET = 0x2,
316 VM_PKT_RM_XFER_PAGESET = 0x3,
317 VM_PKT_ESTABLISH_GPADL = 0x4,
318 VM_PKT_TEARDOWN_GPADL = 0x5,
319 VM_PKT_DATA_INBAND = 0x6,
320 VM_PKT_DATA_USING_XFER_PAGES = 0x7,
321 VM_PKT_DATA_USING_GPADL = 0x8,
322 VM_PKT_DATA_USING_GPA_DIRECT = 0x9,
323 VM_PKT_CANCEL_REQUEST = 0xa,
325 VM_PKT_DATA_USING_ADDITIONAL_PKT = 0xc,
326 VM_PKT_ADDITIONAL_DATA = 0xd
329 #define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED 1
332 /* Version 1 messages */
333 enum vmbus_channel_message_type {
334 CHANNELMSG_INVALID = 0,
335 CHANNELMSG_OFFERCHANNEL = 1,
336 CHANNELMSG_RESCIND_CHANNELOFFER = 2,
337 CHANNELMSG_REQUESTOFFERS = 3,
338 CHANNELMSG_ALLOFFERS_DELIVERED = 4,
339 CHANNELMSG_OPENCHANNEL = 5,
340 CHANNELMSG_OPENCHANNEL_RESULT = 6,
341 CHANNELMSG_CLOSECHANNEL = 7,
342 CHANNELMSG_GPADL_HEADER = 8,
343 CHANNELMSG_GPADL_BODY = 9,
344 CHANNELMSG_GPADL_CREATED = 10,
345 CHANNELMSG_GPADL_TEARDOWN = 11,
346 CHANNELMSG_GPADL_TORNDOWN = 12,
347 CHANNELMSG_RELID_RELEASED = 13,
348 CHANNELMSG_INITIATE_CONTACT = 14,
349 CHANNELMSG_VERSION_RESPONSE = 15,
350 CHANNELMSG_UNLOAD = 16,
351 #ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
352 CHANNELMSG_VIEWRANGE_ADD = 17,
353 CHANNELMSG_VIEWRANGE_REMOVE = 18,
358 struct vmbus_channel_message_header {
359 enum vmbus_channel_message_type msgtype;
363 /* Query VMBus Version parameters */
364 struct vmbus_channel_query_vmbus_version {
365 struct vmbus_channel_message_header header;
369 /* VMBus Version Supported parameters */
370 struct vmbus_channel_version_supported {
371 struct vmbus_channel_message_header header;
372 bool version_supported;
375 /* Offer Channel parameters */
376 struct vmbus_channel_offer_channel {
377 struct vmbus_channel_message_header header;
378 struct vmbus_channel_offer offer;
381 bool monitor_allocated;
384 /* Rescind Offer parameters */
385 struct vmbus_channel_rescind_offer {
386 struct vmbus_channel_message_header header;
391 * Request Offer -- no parameters, SynIC message contains the partition ID
392 * Set Snoop -- no parameters, SynIC message contains the partition ID
393 * Clear Snoop -- no parameters, SynIC message contains the partition ID
394 * All Offers Delivered -- no parameters, SynIC message contains the partition
396 * Flush Client -- no parameters, SynIC message contains the partition ID
399 /* Open Channel parameters */
400 struct vmbus_channel_open_channel {
401 struct vmbus_channel_message_header header;
403 /* Identifies the specific VMBus channel that is being opened. */
406 /* ID making a particular open request at a channel offer unique. */
409 /* GPADL for the channel's ring buffer. */
410 u32 ringbuffer_gpadlhandle;
412 /* GPADL for the channel's server context save area. */
413 u32 server_contextarea_gpadlhandle;
416 * The upstream ring buffer begins at offset zero in the memory
417 * described by RingBufferGpadlHandle. The downstream ring buffer
418 * follows it at this offset (in pages).
420 u32 downstream_ringbuffer_pageoffset;
422 /* User-specific data to be passed along to the server endpoint. */
423 unsigned char userdata[MAX_USER_DEFINED_BYTES];
426 /* Open Channel Result parameters */
427 struct vmbus_channel_open_result {
428 struct vmbus_channel_message_header header;
434 /* Close channel parameters; */
435 struct vmbus_channel_close_channel {
436 struct vmbus_channel_message_header header;
440 /* Channel Message GPADL */
441 #define GPADL_TYPE_RING_BUFFER 1
442 #define GPADL_TYPE_SERVER_SAVE_AREA 2
443 #define GPADL_TYPE_TRANSACTION 8
446 * The number of PFNs in a GPADL message is defined by the number of
447 * pages that would be spanned by ByteCount and ByteOffset. If the
448 * implied number of PFNs won't fit in this packet, there will be a
449 * follow-up packet that contains more.
451 struct vmbus_channel_gpadl_header {
452 struct vmbus_channel_message_header header;
457 struct gpa_range range[0];
460 /* This is the followup packet that contains more PFNs. */
461 struct vmbus_channel_gpadl_body {
462 struct vmbus_channel_message_header header;
468 struct vmbus_channel_gpadl_created {
469 struct vmbus_channel_message_header header;
475 struct vmbus_channel_gpadl_teardown {
476 struct vmbus_channel_message_header header;
481 struct vmbus_channel_gpadl_torndown {
482 struct vmbus_channel_message_header header;
486 #ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
487 struct vmbus_channel_view_range_add {
488 struct vmbus_channel_message_header header;
489 PHYSICAL_ADDRESS viewrange_base;
490 u64 viewrange_length;
494 struct vmbus_channel_view_range_remove {
495 struct vmbus_channel_message_header header;
496 PHYSICAL_ADDRESS viewrange_base;
501 struct vmbus_channel_relid_released {
502 struct vmbus_channel_message_header header;
506 struct vmbus_channel_initiate_contact {
507 struct vmbus_channel_message_header header;
508 u32 vmbus_version_requested;
515 struct vmbus_channel_version_response {
516 struct vmbus_channel_message_header header;
517 bool version_supported;
520 enum vmbus_channel_state {
522 CHANNEL_OPENING_STATE,
526 struct vmbus_channel {
527 struct list_head listentry;
529 struct hv_device *device_obj;
531 struct timer_list poll_timer; /* SA-111 workaround */
532 struct work_struct work;
534 enum vmbus_channel_state state;
536 * For util channels, stash the
537 * the service index for easy access.
541 struct vmbus_channel_offer_channel offermsg;
543 * These are based on the OfferMsg.MonitorId.
544 * Save it here for easy access.
549 u32 ringbuffer_gpadlhandle;
551 /* Allocated memory for ring buffer */
552 void *ringbuffer_pages;
553 u32 ringbuffer_pagecount;
554 struct hv_ring_buffer_info outbound; /* send to parent */
555 struct hv_ring_buffer_info inbound; /* receive from parent */
556 spinlock_t inbound_lock;
557 struct workqueue_struct *controlwq;
559 /* Channel callback are invoked in this workqueue context */
560 /* HANDLE dataWorkQueue; */
562 void (*onchannel_callback)(void *context);
563 void *channel_callback_context;
566 struct vmbus_channel_debug_info {
568 enum vmbus_channel_state state;
569 struct hv_guid interfacetype;
570 struct hv_guid interface_instance;
572 u32 servermonitor_pending;
573 u32 servermonitor_latency;
574 u32 servermonitor_connectionid;
575 u32 clientmonitor_pending;
576 u32 clientmonitor_latency;
577 u32 clientmonitor_connectionid;
579 struct hv_ring_buffer_debug_info inbound;
580 struct hv_ring_buffer_debug_info outbound;
584 * Represents each channel msg on the vmbus connection This is a
585 * variable-size data structure depending on the msg type itself
587 struct vmbus_channel_msginfo {
588 /* Bookkeeping stuff */
589 struct list_head msglistentry;
591 /* So far, this is only used to handle gpadl body message */
592 struct list_head submsglist;
594 /* Synchronize the request/response if needed */
595 struct completion waitevent;
597 struct vmbus_channel_version_supported version_supported;
598 struct vmbus_channel_open_result open_result;
599 struct vmbus_channel_gpadl_torndown gpadl_torndown;
600 struct vmbus_channel_gpadl_created gpadl_created;
601 struct vmbus_channel_version_response version_response;
606 * The channel message that goes out on the "wire".
607 * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
609 unsigned char msg[0];
613 void free_channel(struct vmbus_channel *channel);
615 void vmbus_onmessage(void *context);
617 int vmbus_request_offers(void);
619 /* The format must be the same as struct vmdata_gpa_direct */
620 struct vmbus_channel_packet_page_buffer {
628 struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT];
631 /* The format must be the same as struct vmdata_gpa_direct */
632 struct vmbus_channel_packet_multipage_buffer {
639 u32 rangecount; /* Always 1 in this case */
640 struct hv_multipage_buffer range;
644 extern int vmbus_open(struct vmbus_channel *channel,
645 u32 send_ringbuffersize,
646 u32 recv_ringbuffersize,
649 void(*onchannel_callback)(void *context),
652 extern void vmbus_close(struct vmbus_channel *channel);
654 extern int vmbus_sendpacket(struct vmbus_channel *channel,
658 enum vmbus_packet_type type,
661 extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
662 struct hv_page_buffer pagebuffers[],
668 extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
669 struct hv_multipage_buffer *mpb,
674 extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
679 extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
682 extern int vmbus_recvpacket(struct vmbus_channel *channel,
685 u32 *buffer_actual_len,
688 extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
691 u32 *buffer_actual_len,
694 extern void vmbus_onchannel_event(struct vmbus_channel *channel);
696 extern void vmbus_get_debug_info(struct vmbus_channel *channel,
697 struct vmbus_channel_debug_info *debug);
699 extern void vmbus_ontimer(unsigned long data);
702 #define LOWORD(dw) ((unsigned short)(dw))
703 #define HIWORD(dw) ((unsigned short)(((unsigned int) (dw) >> 16) & 0xFFFF))
707 #define STORVSC 0x0002
708 #define NETVSC 0x0004
709 #define INPUTVSC 0x0008
710 #define BLKVSC 0x0010
711 #define VMBUS_DRV 0x0100
712 #define STORVSC_DRV 0x0200
713 #define NETVSC_DRV 0x0400
714 #define INPUTVSC_DRV 0x0800
715 #define BLKVSC_DRV 0x1000
717 #define ALL_MODULES (VMBUS |\
730 #define WARNING_LVL 4
733 #define DEBUG_LVL_ENTEREXIT 8
734 #define DEBUG_RING_LVL 9
736 extern unsigned int vmbus_loglevel;
738 #define DPRINT(mod, lvl, fmt, args...) do {\
739 if ((mod & (HIWORD(vmbus_loglevel))) && \
740 (lvl <= LOWORD(vmbus_loglevel))) \
741 printk(KERN_DEBUG #mod": %s() " fmt "\n", __func__, ## args);\
744 #define DPRINT_DBG(mod, fmt, args...) do {\
745 if ((mod & (HIWORD(vmbus_loglevel))) && \
746 (DEBUG_LVL <= LOWORD(vmbus_loglevel))) \
747 printk(KERN_DEBUG #mod": %s() " fmt "\n", __func__, ## args);\
750 #define DPRINT_INFO(mod, fmt, args...) do {\
751 if ((mod & (HIWORD(vmbus_loglevel))) && \
752 (INFO_LVL <= LOWORD(vmbus_loglevel))) \
753 printk(KERN_INFO #mod": " fmt "\n", ## args);\
756 #define DPRINT_WARN(mod, fmt, args...) do {\
757 if ((mod & (HIWORD(vmbus_loglevel))) && \
758 (WARNING_LVL <= LOWORD(vmbus_loglevel))) \
759 printk(KERN_WARNING #mod": WARNING! " fmt "\n", ## args);\
762 #define DPRINT_ERR(mod, fmt, args...) do {\
763 if ((mod & (HIWORD(vmbus_loglevel))) && \
764 (ERROR_LVL <= LOWORD(vmbus_loglevel))) \
765 printk(KERN_ERR #mod": %s() ERROR!! " fmt "\n", \
774 struct hv_dev_port_info {
778 u32 bytes_avail_toread;
779 u32 bytes_avail_towrite;
782 struct hv_device_info {
785 struct hv_guid chn_type;
786 struct hv_guid chn_instance;
789 u32 server_monitor_pending;
790 u32 server_monitor_latency;
791 u32 server_monitor_conn_id;
792 u32 client_monitor_pending;
793 u32 client_monitor_latency;
794 u32 client_monitor_conn_id;
796 struct hv_dev_port_info inbound;
797 struct hv_dev_port_info outbound;
800 /* Base driver object */
804 /* the device type supported by this driver */
805 struct hv_guid dev_type;
807 struct device_driver driver;
809 int (*probe)(struct hv_device *);
810 int (*remove)(struct hv_device *);
811 void (*shutdown)(struct hv_device *);
815 /* Base device object */
817 /* the device type id of this device */
818 struct hv_guid dev_type;
820 /* the device instance id of this device */
821 struct hv_guid dev_instance;
823 struct device device;
825 struct vmbus_channel *channel;
827 /* Device extension; */
832 static inline struct hv_device *device_to_hv_device(struct device *d)
834 return container_of(d, struct hv_device, device);
837 static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d)
839 return container_of(d, struct hv_driver, driver);
843 /* Vmbus interface */
844 int vmbus_child_driver_register(struct device_driver *drv);
845 void vmbus_child_driver_unregister(struct device_driver *drv);
848 * Common header for Hyper-V ICs
851 #define ICMSGTYPE_NEGOTIATE 0
852 #define ICMSGTYPE_HEARTBEAT 1
853 #define ICMSGTYPE_KVPEXCHANGE 2
854 #define ICMSGTYPE_SHUTDOWN 3
855 #define ICMSGTYPE_TIMESYNC 4
856 #define ICMSGTYPE_VSS 5
858 #define ICMSGHDRFLAG_TRANSACTION 1
859 #define ICMSGHDRFLAG_REQUEST 2
860 #define ICMSGHDRFLAG_RESPONSE 4
862 #define HV_S_OK 0x00000000
863 #define HV_E_FAIL 0x80004005
864 #define HV_ERROR_NOT_SUPPORTED 0x80070032
865 #define HV_ERROR_MACHINE_LOCKED 0x800704F7
867 struct vmbuspipe_hdr {
878 struct ic_version icverframe;
880 struct ic_version icvermsg;
888 struct icmsg_negotiate {
892 struct ic_version icversion_data[1]; /* any size array */
895 struct shutdown_msg_data {
899 u8 display_message[2048];
902 struct heartbeat_msg_data {
907 /* Time Sync IC defs */
908 #define ICTIMESYNCFLAG_PROBE 0
909 #define ICTIMESYNCFLAG_SYNC 1
910 #define ICTIMESYNCFLAG_SAMPLE 2
913 #define WLTIMEDELTA 116444736000000000L /* in 100ns unit */
915 #define WLTIMEDELTA 116444736000000000LL
918 struct ictimesync_data {
925 /* Index for each IC struct in array hv_cb_utils[] */
926 #define HV_SHUTDOWN_MSG 0
927 #define HV_TIMESYNC_MSG 1
928 #define HV_HEARTBEAT_MSG 2
931 struct hyperv_service_callback {
934 unsigned char data[16];
935 struct vmbus_channel *channel;
936 void (*callback) (void *context);
939 extern void prep_negotiate_resp(struct icmsg_hdr *,
940 struct icmsg_negotiate *, u8 *);
941 extern void chn_cb_negotiate(void *);
942 extern struct hyperv_service_callback hv_cb_utils[];
944 #endif /* _HYPERV_H */