1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 *
4 * Copyright (c) 2011, Microsoft Corporation.
5 *
6 * Authors:
7 * Haiyang Zhang <haiyangz@microsoft.com>
8 * Hank Janssen <hjanssen@microsoft.com>
9 * K. Y. Srinivasan <kys@microsoft.com>
10 */
11
12 #ifndef _HYPERV_H
13 #define _HYPERV_H
14
15 #include <uapi/linux/hyperv.h>
16
17 #include <linux/mm.h>
18 #include <linux/types.h>
19 #include <linux/scatterlist.h>
20 #include <linux/list.h>
21 #include <linux/timer.h>
22 #include <linux/completion.h>
23 #include <linux/device.h>
24 #include <linux/device-id/hv_vmbus.h>
25 #include <linux/interrupt.h>
26 #include <linux/reciprocal_div.h>
27 #include <hyperv/hvhdk.h>
28
29 #define MAX_PAGE_BUFFER_COUNT 32
30 #define MAX_MULTIPAGE_BUFFER_COUNT 32 /* 128K */
31
32 #pragma pack(push, 1)
33
34 /*
35 * Types for GPADL, decides is how GPADL header is created.
36 *
37 * It doesn't make much difference between BUFFER and RING if PAGE_SIZE is the
38 * same as HV_HYP_PAGE_SIZE.
39 *
40 * If PAGE_SIZE is bigger than HV_HYP_PAGE_SIZE, the headers of ring buffers
41 * will be of PAGE_SIZE, however, only the first HV_HYP_PAGE will be put
42 * into gpadl, therefore the number for HV_HYP_PAGE and the indexes of each
43 * HV_HYP_PAGE will be different between different types of GPADL, for example
44 * if PAGE_SIZE is 64K:
45 *
46 * BUFFER:
47 *
48 * gva: |-- 64k --|-- 64k --| ... |
49 * gpa: | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k |
50 * index: 0 1 2 15 16 17 18 .. 31 32 ...
51 * | | ... | | | ... | ...
52 * v V V V V V
53 * gpadl: | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k | ... |
54 * index: 0 1 2 ... 15 16 17 18 .. 31 32 ...
55 *
56 * RING:
57 *
58 * | header | data | header | data |
59 * gva: |-- 64k --|-- 64k --| ... |-- 64k --|-- 64k --| ... |
60 * gpa: | 4k | .. | 4k | 4k | ... | 4k | ... | 4k | .. | 4k | .. | ... |
61 * index: 0 1 16 17 18 31 ... n n+1 n+16 ... 2n
62 * | / / / | / /
63 * | / / / | / /
64 * | / / ... / ... | / ... /
65 * | / / / | / /
66 * | / / / | / /
67 * V V V V V V v
68 * gpadl: | 4k | 4k | ... | ... | 4k | 4k | ... |
69 * index: 0 1 2 ... 16 ... n-15 n-14 n-13 ... 2n-30
70 */
71 enum hv_gpadl_type {
72 HV_GPADL_BUFFER,
73 HV_GPADL_RING,
74 HV_GPADL_BUFFER_DECRYPTED
75 };
76
77 /* Single-page buffer */
78 struct hv_page_buffer {
79 u32 len;
80 u32 offset;
81 u64 pfn;
82 };
83
84 /* Multiple-page buffer */
85 struct hv_multipage_buffer {
86 /* Length and Offset determines the # of pfns in the array */
87 u32 len;
88 u32 offset;
89 u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT];
90 };
91
92 /*
93 * Multiple-page buffer array; the pfn array is variable size:
94 * The number of entries in the PFN array is determined by
95 * "len" and "offset".
96 */
97 struct hv_mpb_array {
98 /* Length and Offset determines the # of pfns in the array */
99 u32 len;
100 u32 offset;
101 u64 pfn_array[];
102 };
103
104 /* 0x18 includes the proprietary packet header */
105 #define MAX_PAGE_BUFFER_PACKET (0x18 + \
106 (sizeof(struct hv_page_buffer) * \
107 MAX_PAGE_BUFFER_COUNT))
108 #define MAX_MULTIPAGE_BUFFER_PACKET (0x18 + \
109 sizeof(struct hv_multipage_buffer))
110
111
112 #pragma pack(pop)
113
114 struct hv_ring_buffer {
115 /* Offset in bytes from the start of ring data below */
116 u32 write_index;
117
118 /* Offset in bytes from the start of ring data below */
119 u32 read_index;
120
121 u32 interrupt_mask;
122
123 /*
124 * WS2012/Win8 and later versions of Hyper-V implement interrupt
125 * driven flow management. The feature bit feat_pending_send_sz
126 * is set by the host on the host->guest ring buffer, and by the
127 * guest on the guest->host ring buffer.
128 *
129 * The meaning of the feature bit is a bit complex in that it has
130 * semantics that apply to both ring buffers. If the guest sets
131 * the feature bit in the guest->host ring buffer, the guest is
132 * telling the host that:
133 * 1) It will set the pending_send_sz field in the guest->host ring
134 * buffer when it is waiting for space to become available, and
135 * 2) It will read the pending_send_sz field in the host->guest
136 * ring buffer and interrupt the host when it frees enough space
137 *
138 * Similarly, if the host sets the feature bit in the host->guest
139 * ring buffer, the host is telling the guest that:
140 * 1) It will set the pending_send_sz field in the host->guest ring
141 * buffer when it is waiting for space to become available, and
142 * 2) It will read the pending_send_sz field in the guest->host
143 * ring buffer and interrupt the guest when it frees enough space
144 *
145 * If either the guest or host does not set the feature bit that it
146 * owns, that guest or host must do polling if it encounters a full
147 * ring buffer, and not signal the other end with an interrupt.
148 */
149 u32 pending_send_sz;
150 u32 reserved1[12];
151 union {
152 struct {
153 u32 feat_pending_send_sz:1;
154 };
155 u32 value;
156 } feature_bits;
157
158 /* Pad it to PAGE_SIZE so that data starts on page boundary */
159 u8 reserved2[PAGE_SIZE - 68];
160
161 /*
162 * Ring data starts here + RingDataStartOffset
163 * !!! DO NOT place any fields below this !!!
164 */
165 u8 buffer[];
166 } __packed;
167
168
169 /*
170 * If the requested ring buffer size is at least 8 times the size of the
171 * header, steal space from the ring buffer for the header. Otherwise, add
172 * space for the header so that is doesn't take too much of the ring buffer
173 * space.
174 *
175 * The factor of 8 is somewhat arbitrary. The goal is to prevent adding a
176 * relatively small header (4 Kbytes on x86) to a large-ish power-of-2 ring
177 * buffer size (such as 128 Kbytes) and so end up making a nearly twice as
178 * large allocation that will be almost half wasted. As a contrasting example,
179 * on ARM64 with 64 Kbyte page size, we don't want to take 64 Kbytes for the
180 * header from a 128 Kbyte allocation, leaving only 64 Kbytes for the ring.
181 * In this latter case, we must add 64 Kbytes for the header and not worry
182 * about what's wasted.
183 */
184 #define VMBUS_HEADER_ADJ(payload_sz) \
185 ((payload_sz) >= 8 * sizeof(struct hv_ring_buffer) ? \
186 0 : sizeof(struct hv_ring_buffer))
187
188 /* Calculate the proper size of a ringbuffer, it must be page-aligned */
189 #define VMBUS_RING_SIZE(payload_sz) PAGE_ALIGN(VMBUS_HEADER_ADJ(payload_sz) + \
190 (payload_sz))
191
192 struct hv_ring_buffer_info {
193 struct hv_ring_buffer *ring_buffer;
194 u32 ring_size; /* Include the shared header */
195 struct reciprocal_value ring_size_div10_reciprocal;
196 spinlock_t ring_lock;
197
198 u32 ring_datasize; /* < ring_size */
199 u32 priv_read_index;
200 /*
201 * The ring buffer mutex lock. This lock prevents the ring buffer from
202 * being freed while the ring buffer is being accessed.
203 */
204 struct mutex ring_buffer_mutex;
205
206 /* Buffer that holds a copy of an incoming host packet */
207 void *pkt_buffer;
208 u32 pkt_buffer_size;
209 };
210
211
hv_get_bytes_to_read(const struct hv_ring_buffer_info * rbi)212 static inline u32 hv_get_bytes_to_read(const struct hv_ring_buffer_info *rbi)
213 {
214 u32 read_loc, write_loc, dsize, read;
215
216 dsize = rbi->ring_datasize;
217 read_loc = rbi->ring_buffer->read_index;
218 write_loc = READ_ONCE(rbi->ring_buffer->write_index);
219
220 read = write_loc >= read_loc ? (write_loc - read_loc) :
221 (dsize - read_loc) + write_loc;
222
223 return read;
224 }
225
hv_get_bytes_to_write(const struct hv_ring_buffer_info * rbi)226 static inline u32 hv_get_bytes_to_write(const struct hv_ring_buffer_info *rbi)
227 {
228 u32 read_loc, write_loc, dsize, write;
229
230 dsize = rbi->ring_datasize;
231 read_loc = READ_ONCE(rbi->ring_buffer->read_index);
232 write_loc = rbi->ring_buffer->write_index;
233
234 write = write_loc >= read_loc ? dsize - (write_loc - read_loc) :
235 read_loc - write_loc;
236 return write;
237 }
238
hv_get_avail_to_write_percent(const struct hv_ring_buffer_info * rbi)239 static inline u32 hv_get_avail_to_write_percent(
240 const struct hv_ring_buffer_info *rbi)
241 {
242 u32 avail_write = hv_get_bytes_to_write(rbi);
243
244 return reciprocal_divide(
245 (avail_write << 3) + (avail_write << 1),
246 rbi->ring_size_div10_reciprocal);
247 }
248
249 /*
250 * VMBUS version is 32 bit entity broken up into
251 * two 16 bit quantities: major_number. minor_number.
252 *
253 * 0 . 13 (Windows Server 2008)
254 * 1 . 1 (Windows 7, WS2008 R2)
255 * 2 . 4 (Windows 8, WS2012)
256 * 3 . 0 (Windows 8.1, WS2012 R2)
257 * 4 . 0 (Windows 10)
258 * 4 . 1 (Windows 10 RS3)
259 * 5 . 0 (Newer Windows 10)
260 * 5 . 1 (Windows 10 RS4)
261 * 5 . 2 (Windows Server 2019, RS5)
262 * 5 . 3 (Windows Server 2022)
263 *
264 * The WS2008, WIN7, WIN8, and WIN8_1 versions are listed here for
265 * completeness but are no longer supported in the Linux kernel.
266 */
267
268 #define VMBUS_MAKE_VERSION(MAJ, MIN) ((((u32)MAJ) << 16) | (MIN))
269 #define VERSION_WS2008 VMBUS_MAKE_VERSION(0, 13)
270 #define VERSION_WIN7 VMBUS_MAKE_VERSION(1, 1)
271 #define VERSION_WIN8 VMBUS_MAKE_VERSION(2, 4)
272 #define VERSION_WIN8_1 VMBUS_MAKE_VERSION(3, 0)
273 #define VERSION_WIN10 VMBUS_MAKE_VERSION(4, 0)
274 #define VERSION_WIN10_V4_1 VMBUS_MAKE_VERSION(4, 1)
275 #define VERSION_WIN10_V5 VMBUS_MAKE_VERSION(5, 0)
276 #define VERSION_WIN10_V5_1 VMBUS_MAKE_VERSION(5, 1)
277 #define VERSION_WIN10_V5_2 VMBUS_MAKE_VERSION(5, 2)
278 #define VERSION_WIN10_V5_3 VMBUS_MAKE_VERSION(5, 3)
279 #define VERSION_WIN10_V6_0 VMBUS_MAKE_VERSION(6, 0)
280
281 /* Make maximum size of pipe payload of 16K */
282 #define MAX_PIPE_DATA_PAYLOAD (sizeof(u8) * 16384)
283
284 /* Define PipeMode values. */
285 #define VMBUS_PIPE_TYPE_BYTE 0x00000000
286 #define VMBUS_PIPE_TYPE_MESSAGE 0x00000004
287
288 /* The size of the user defined data buffer for non-pipe offers. */
289 #define MAX_USER_DEFINED_BYTES 120
290
291 /* The size of the user defined data buffer for pipe offers. */
292 #define MAX_PIPE_USER_DEFINED_BYTES 116
293
294 /*
295 * At the center of the Channel Management library is the Channel Offer. This
296 * struct contains the fundamental information about an offer.
297 */
298 struct vmbus_channel_offer {
299 guid_t if_type;
300 guid_t if_instance;
301
302 /*
303 * These two fields are not currently used.
304 */
305 u64 reserved1;
306 u64 reserved2;
307
308 u16 chn_flags;
309 u16 mmio_megabytes; /* in bytes * 1024 * 1024 */
310
311 union {
312 /* Non-pipes: The user has MAX_USER_DEFINED_BYTES bytes. */
313 struct {
314 unsigned char user_def[MAX_USER_DEFINED_BYTES];
315 } std;
316
317 /*
318 * Pipes:
319 * The following structure is an integrated pipe protocol, which
320 * is implemented on top of standard user-defined data. Pipe
321 * clients have MAX_PIPE_USER_DEFINED_BYTES left for their own
322 * use.
323 */
324 struct {
325 u32 pipe_mode;
326 unsigned char user_def[MAX_PIPE_USER_DEFINED_BYTES];
327 } pipe;
328 } u;
329 /*
330 * The sub_channel_index is defined in Win8: a value of zero means a
331 * primary channel and a value of non-zero means a sub-channel.
332 *
333 * Before Win8, the field is reserved, meaning it's always zero.
334 */
335 u16 sub_channel_index;
336 u16 reserved3;
337 } __packed;
338
339 /* Server Flags */
340 #define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE 0x0001
341 /*
342 * This flag indicates that the channel is offered by the paravisor, and must
343 * use encrypted memory for the channel ring buffer.
344 */
345 #define VMBUS_CHANNEL_CONFIDENTIAL_RING_BUFFER 0x0002
346 /*
347 * This flag indicates that the channel is offered by the paravisor, and must
348 * use encrypted memory for GPA direct packets and additional GPADLs.
349 */
350 #define VMBUS_CHANNEL_CONFIDENTIAL_EXTERNAL_MEMORY 0x0004
351 #define VMBUS_CHANNEL_NAMED_PIPE_MODE 0x0010
352 #define VMBUS_CHANNEL_LOOPBACK_OFFER 0x0100
353 #define VMBUS_CHANNEL_PARENT_OFFER 0x0200
354 #define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION 0x0400
355 #define VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER 0x2000
356
357 struct vmpacket_descriptor {
358 u16 type;
359 u16 offset8;
360 u16 len8;
361 u16 flags;
362 u64 trans_id;
363 } __packed;
364
365 struct vmpacket_header {
366 u32 prev_pkt_start_offset;
367 struct vmpacket_descriptor descriptor;
368 } __packed;
369
370 struct vmtransfer_page_range {
371 u32 byte_count;
372 u32 byte_offset;
373 } __packed;
374
375 struct vmtransfer_page_packet_header {
376 struct vmpacket_descriptor d;
377 u16 xfer_pageset_id;
378 u8 sender_owns_set;
379 u8 reserved;
380 u32 range_cnt;
381 struct vmtransfer_page_range ranges[];
382 } __packed;
383
384 /*
385 * This structure defines a range in guest physical space that can be made to
386 * look virtually contiguous.
387 */
388 struct gpa_range {
389 u32 byte_count;
390 u32 byte_offset;
391 u64 pfn_array[];
392 };
393
394 /*
395 * This is the format for a GPA-Direct packet, which contains a set of GPA
396 * ranges, in addition to commands and/or data.
397 */
398 struct vmdata_gpa_direct {
399 struct vmpacket_descriptor d;
400 u32 reserved;
401 u32 range_cnt;
402 struct gpa_range range[1];
403 } __packed;
404
405 #define VMPACKET_DATA_START_ADDRESS(__packet) \
406 (void *)(((unsigned char *)__packet) + \
407 ((struct vmpacket_descriptor)__packet)->offset8 * 8)
408
409 #define VMPACKET_DATA_LENGTH(__packet) \
410 ((((struct vmpacket_descriptor)__packet)->len8 - \
411 ((struct vmpacket_descriptor)__packet)->offset8) * 8)
412
413 #define VMPACKET_TRANSFER_MODE(__packet) \
414 (((struct IMPACT)__packet)->type)
415
416 enum vmbus_packet_type {
417 VM_PKT_INVALID = 0x0,
418 VM_PKT_SYNCH = 0x1,
419 VM_PKT_ADD_XFER_PAGESET = 0x2,
420 VM_PKT_RM_XFER_PAGESET = 0x3,
421 VM_PKT_ESTABLISH_GPADL = 0x4,
422 VM_PKT_TEARDOWN_GPADL = 0x5,
423 VM_PKT_DATA_INBAND = 0x6,
424 VM_PKT_DATA_USING_XFER_PAGES = 0x7,
425 VM_PKT_DATA_USING_GPADL = 0x8,
426 VM_PKT_DATA_USING_GPA_DIRECT = 0x9,
427 VM_PKT_CANCEL_REQUEST = 0xa,
428 VM_PKT_COMP = 0xb,
429 VM_PKT_DATA_USING_ADDITIONAL_PKT = 0xc,
430 VM_PKT_ADDITIONAL_DATA = 0xd
431 };
432
433 #define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED 1
434
435
436 /* Version 1 messages */
437 enum vmbus_channel_message_type {
438 CHANNELMSG_INVALID = 0,
439 CHANNELMSG_OFFERCHANNEL = 1,
440 CHANNELMSG_RESCIND_CHANNELOFFER = 2,
441 CHANNELMSG_REQUESTOFFERS = 3,
442 CHANNELMSG_ALLOFFERS_DELIVERED = 4,
443 CHANNELMSG_OPENCHANNEL = 5,
444 CHANNELMSG_OPENCHANNEL_RESULT = 6,
445 CHANNELMSG_CLOSECHANNEL = 7,
446 CHANNELMSG_GPADL_HEADER = 8,
447 CHANNELMSG_GPADL_BODY = 9,
448 CHANNELMSG_GPADL_CREATED = 10,
449 CHANNELMSG_GPADL_TEARDOWN = 11,
450 CHANNELMSG_GPADL_TORNDOWN = 12,
451 CHANNELMSG_RELID_RELEASED = 13,
452 CHANNELMSG_INITIATE_CONTACT = 14,
453 CHANNELMSG_VERSION_RESPONSE = 15,
454 CHANNELMSG_UNLOAD = 16,
455 CHANNELMSG_UNLOAD_RESPONSE = 17,
456 CHANNELMSG_18 = 18,
457 CHANNELMSG_19 = 19,
458 CHANNELMSG_20 = 20,
459 CHANNELMSG_TL_CONNECT_REQUEST = 21,
460 CHANNELMSG_MODIFYCHANNEL = 22,
461 CHANNELMSG_TL_CONNECT_RESULT = 23,
462 CHANNELMSG_MODIFYCHANNEL_RESPONSE = 24,
463 CHANNELMSG_COUNT
464 };
465
466 /* Hyper-V supports about 2048 channels, and the RELIDs start with 1. */
467 #define INVALID_RELID U32_MAX
468
469 struct vmbus_channel_message_header {
470 enum vmbus_channel_message_type msgtype;
471 u32 padding;
472 } __packed;
473
474 /* Query VMBus Version parameters */
475 struct vmbus_channel_query_vmbus_version {
476 struct vmbus_channel_message_header header;
477 u32 version;
478 } __packed;
479
480 /* VMBus Version Supported parameters */
481 struct vmbus_channel_version_supported {
482 struct vmbus_channel_message_header header;
483 u8 version_supported;
484 } __packed;
485
486 /* Offer Channel parameters */
487 struct vmbus_channel_offer_channel {
488 struct vmbus_channel_message_header header;
489 struct vmbus_channel_offer offer;
490 u32 child_relid;
491 u8 monitorid;
492 /*
493 * win7 and beyond splits this field into a bit field.
494 */
495 u8 monitor_allocated:1;
496 u8 reserved:7;
497 /*
498 * These are new fields added in win7 and later.
499 * Do not access these fields without checking the
500 * negotiated protocol.
501 *
502 * If "is_dedicated_interrupt" is set, we must not set the
503 * associated bit in the channel bitmap while sending the
504 * interrupt to the host.
505 *
506 * connection_id is to be used in signaling the host.
507 */
508 u16 is_dedicated_interrupt:1;
509 u16 reserved1:15;
510 u32 connection_id;
511 } __packed;
512
513 /* Rescind Offer parameters */
514 struct vmbus_channel_rescind_offer {
515 struct vmbus_channel_message_header header;
516 u32 child_relid;
517 } __packed;
518
519 /*
520 * Request Offer -- no parameters, SynIC message contains the partition ID
521 * Set Snoop -- no parameters, SynIC message contains the partition ID
522 * Clear Snoop -- no parameters, SynIC message contains the partition ID
523 * All Offers Delivered -- no parameters, SynIC message contains the partition
524 * ID
525 * Flush Client -- no parameters, SynIC message contains the partition ID
526 */
527
528 /* Open Channel parameters */
529 struct vmbus_channel_open_channel {
530 struct vmbus_channel_message_header header;
531
532 /* Identifies the specific VMBus channel that is being opened. */
533 u32 child_relid;
534
535 /* ID making a particular open request at a channel offer unique. */
536 u32 openid;
537
538 /* GPADL for the channel's ring buffer. */
539 u32 ringbuffer_gpadlhandle;
540
541 /*
542 * Starting with win8, this field will be used to specify
543 * the target virtual processor on which to deliver the interrupt for
544 * the host to guest communication.
545 * Prior to win8, incoming channel interrupts would only
546 * be delivered on cpu 0. Setting this value to 0 would
547 * preserve the earlier behavior.
548 */
549 u32 target_vp;
550
551 /*
552 * The upstream ring buffer begins at offset zero in the memory
553 * described by RingBufferGpadlHandle. The downstream ring buffer
554 * follows it at this offset (in pages).
555 */
556 u32 downstream_ringbuffer_pageoffset;
557
558 /* User-specific data to be passed along to the server endpoint. */
559 unsigned char userdata[MAX_USER_DEFINED_BYTES];
560 } __packed;
561
562 /* Open Channel Result parameters */
563 struct vmbus_channel_open_result {
564 struct vmbus_channel_message_header header;
565 u32 child_relid;
566 u32 openid;
567 u32 status;
568 } __packed;
569
570 /* Modify Channel Result parameters */
571 struct vmbus_channel_modifychannel_response {
572 struct vmbus_channel_message_header header;
573 u32 child_relid;
574 u32 status;
575 } __packed;
576
577 /* Close channel parameters; */
578 struct vmbus_channel_close_channel {
579 struct vmbus_channel_message_header header;
580 u32 child_relid;
581 } __packed;
582
583 /* Channel Message GPADL */
584 #define GPADL_TYPE_RING_BUFFER 1
585 #define GPADL_TYPE_SERVER_SAVE_AREA 2
586 #define GPADL_TYPE_TRANSACTION 8
587
588 /*
589 * The number of PFNs in a GPADL message is defined by the number of
590 * pages that would be spanned by ByteCount and ByteOffset. If the
591 * implied number of PFNs won't fit in this packet, there will be a
592 * follow-up packet that contains more.
593 */
594 struct vmbus_channel_gpadl_header {
595 struct vmbus_channel_message_header header;
596 u32 child_relid;
597 u32 gpadl;
598 u16 range_buflen;
599 u16 rangecount;
600 struct gpa_range range[];
601 } __packed;
602
603 /* This is the followup packet that contains more PFNs. */
604 struct vmbus_channel_gpadl_body {
605 struct vmbus_channel_message_header header;
606 u32 msgnumber;
607 u32 gpadl;
608 u64 pfn[];
609 } __packed;
610
611 struct vmbus_channel_gpadl_created {
612 struct vmbus_channel_message_header header;
613 u32 child_relid;
614 u32 gpadl;
615 u32 creation_status;
616 } __packed;
617
618 struct vmbus_channel_gpadl_teardown {
619 struct vmbus_channel_message_header header;
620 u32 child_relid;
621 u32 gpadl;
622 } __packed;
623
624 struct vmbus_channel_gpadl_torndown {
625 struct vmbus_channel_message_header header;
626 u32 gpadl;
627 } __packed;
628
629 struct vmbus_channel_relid_released {
630 struct vmbus_channel_message_header header;
631 u32 child_relid;
632 } __packed;
633
634 /*
635 * Used by the paravisor only, means that the encrypted ring buffers and
636 * the encrypted external memory are supported
637 */
638 #define VMBUS_FEATURE_FLAG_CONFIDENTIAL_CHANNELS 0x10
639
640 struct vmbus_channel_initiate_contact {
641 struct vmbus_channel_message_header header;
642 u32 vmbus_version_requested;
643 u32 target_vcpu; /* The VCPU the host should respond to */
644 union {
645 u64 interrupt_page;
646 struct {
647 u8 msg_sint;
648 u8 msg_vtl;
649 u8 reserved[2];
650 u32 feature_flags; /* VMBus version 6.0 */
651 };
652 };
653 u64 monitor_page1;
654 u64 monitor_page2;
655 } __packed;
656
657 /* Hyper-V socket: guest's connect()-ing to host */
658 struct vmbus_channel_tl_connect_request {
659 struct vmbus_channel_message_header header;
660 guid_t guest_endpoint_id;
661 guid_t host_service_id;
662 } __packed;
663
664 /* Modify Channel parameters, cf. vmbus_send_modifychannel() */
665 struct vmbus_channel_modifychannel {
666 struct vmbus_channel_message_header header;
667 u32 child_relid;
668 u32 target_vp;
669 } __packed;
670
671 struct vmbus_channel_version_response {
672 struct vmbus_channel_message_header header;
673 u8 version_supported;
674
675 u8 connection_state;
676 u16 padding;
677
678 /*
679 * On new hosts that support VMBus protocol 5.0, we must use
680 * VMBUS_MESSAGE_CONNECTION_ID_4 for the Initiate Contact Message,
681 * and for subsequent messages, we must use the Message Connection ID
682 * field in the host-returned Version Response Message.
683 *
684 * On old hosts, we should always use VMBUS_MESSAGE_CONNECTION_ID (1).
685 */
686 u32 msg_conn_id;
687 } __packed;
688
689 enum vmbus_channel_state {
690 CHANNEL_OFFER_STATE,
691 CHANNEL_OPENING_STATE,
692 CHANNEL_OPEN_STATE,
693 CHANNEL_OPENED_STATE,
694 };
695
696 /*
697 * Represents each channel msg on the vmbus connection This is a
698 * variable-size data structure depending on the msg type itself
699 */
700 struct vmbus_channel_msginfo {
701 /* Bookkeeping stuff */
702 struct list_head msglistentry;
703
704 /* So far, this is only used to handle gpadl body message */
705 struct list_head submsglist;
706
707 /* Synchronize the request/response if needed */
708 struct completion waitevent;
709 struct vmbus_channel *waiting_channel;
710 union {
711 struct vmbus_channel_version_supported version_supported;
712 struct vmbus_channel_open_result open_result;
713 struct vmbus_channel_gpadl_torndown gpadl_torndown;
714 struct vmbus_channel_gpadl_created gpadl_created;
715 struct vmbus_channel_version_response version_response;
716 struct vmbus_channel_modifychannel_response modify_response;
717 } response;
718
719 u32 msgsize;
720 /*
721 * The channel message that goes out on the "wire".
722 * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
723 */
724 unsigned char msg[];
725 };
726
727 enum vmbus_device_type {
728 HV_IDE = 0,
729 HV_SCSI,
730 HV_FC,
731 HV_NIC,
732 HV_ND,
733 HV_PCIE,
734 HV_FB,
735 HV_KBD,
736 HV_MOUSE,
737 HV_KVP,
738 HV_TS,
739 HV_HB,
740 HV_SHUTDOWN,
741 HV_FCOPY,
742 HV_BACKUP,
743 HV_DM,
744 HV_UNKNOWN,
745 };
746
747 /*
748 * Provides request ids for VMBus. Encapsulates guest memory
749 * addresses and stores the next available slot in req_arr
750 * to generate new ids in constant time.
751 */
752 struct vmbus_requestor {
753 u64 *req_arr;
754 unsigned long *req_bitmap; /* is a given slot available? */
755 u32 size;
756 u64 next_request_id;
757 spinlock_t req_lock; /* provides atomicity */
758 };
759
760 #define VMBUS_NO_RQSTOR U64_MAX
761 #define VMBUS_RQST_ERROR (U64_MAX - 1)
762 #define VMBUS_RQST_ADDR_ANY U64_MAX
763 /* NetVSC-specific */
764 #define VMBUS_RQST_ID_NO_RESPONSE (U64_MAX - 2)
765 /* StorVSC-specific */
766 #define VMBUS_RQST_INIT (U64_MAX - 2)
767 #define VMBUS_RQST_RESET (U64_MAX - 3)
768
769 struct vmbus_device {
770 /* preferred ring buffer size in KB, 0 means no preferred size for this device */
771 size_t pref_ring_size;
772 u16 dev_type;
773 guid_t guid;
774 bool perf_device;
775 bool allowed_in_isolated;
776 };
777
778 #define VMBUS_DEFAULT_MAX_PKT_SIZE 4096
779
780 struct vmbus_gpadl {
781 u32 gpadl_handle;
782 u32 size;
783 void *buffer;
784 bool decrypted;
785 };
786
787 struct vmbus_channel {
788 struct list_head listentry;
789
790 struct hv_device *device_obj;
791
792 enum vmbus_channel_state state;
793
794 struct vmbus_channel_offer_channel offermsg;
795 /*
796 * These are based on the OfferMsg.MonitorId.
797 * Save it here for easy access.
798 */
799 u8 monitor_grp;
800 u8 monitor_bit;
801
802 bool rescind; /* got rescind msg */
803 bool rescind_ref; /* got rescind msg, got channel reference */
804 struct completion rescind_event;
805
806 struct vmbus_gpadl ringbuffer_gpadlhandle;
807
808 /* Allocated memory for ring buffer */
809 struct page *ringbuffer_page;
810 u32 ringbuffer_pagecount;
811 u32 ringbuffer_send_offset;
812 struct hv_ring_buffer_info outbound; /* send to parent */
813 struct hv_ring_buffer_info inbound; /* receive from parent */
814
815 struct vmbus_channel_close_channel close_msg;
816
817 /* Statistics */
818 u64 interrupts; /* Host to Guest interrupts */
819 u64 sig_events; /* Guest to Host events */
820
821 /*
822 * Guest to host interrupts caused by the outbound ring buffer changing
823 * from empty to not empty.
824 */
825 u64 intr_out_empty;
826
827 /*
828 * Indicates that a full outbound ring buffer was encountered. The flag
829 * is set to true when a full outbound ring buffer is encountered and
830 * set to false when a write to the outbound ring buffer is completed.
831 */
832 bool out_full_flag;
833
834 /* Channel callback's invoked in softirq context */
835 struct tasklet_struct callback_event;
836 void (*onchannel_callback)(void *context);
837 void *channel_callback_context;
838
839 void (*change_target_cpu_callback)(struct vmbus_channel *channel,
840 u32 old, u32 new);
841
842 /*
843 * Synchronize channel scheduling and channel removal; see the inline
844 * comments in vmbus_chan_sched() and vmbus_reset_channel_cb().
845 */
846 spinlock_t sched_lock;
847
848 /*
849 * A channel can be marked for one of three modes of reading:
850 * BATCHED - callback called from taslket and should read
851 * channel until empty. Interrupts from the host
852 * are masked while read is in process (default).
853 * DIRECT - callback called from tasklet (softirq).
854 * ISR - callback called in interrupt context and must
855 * invoke its own deferred processing.
856 * Host interrupts are disabled and must be re-enabled
857 * when ring is empty.
858 */
859 enum hv_callback_mode {
860 HV_CALL_BATCHED,
861 HV_CALL_DIRECT,
862 HV_CALL_ISR
863 } callback_mode;
864
865 bool is_dedicated_interrupt;
866 u64 sig_event;
867
868 /*
869 * Starting with win8, this field will be used to specify the
870 * target CPU on which to deliver the interrupt for the host
871 * to guest communication.
872 *
873 * Prior to win8, incoming channel interrupts would only be
874 * delivered on CPU 0. Setting this value to 0 would preserve
875 * the earlier behavior.
876 */
877 u32 target_cpu;
878 /*
879 * Support for sub-channels. For high performance devices,
880 * it will be useful to have multiple sub-channels to support
881 * a scalable communication infrastructure with the host.
882 * The support for sub-channels is implemented as an extension
883 * to the current infrastructure.
884 * The initial offer is considered the primary channel and this
885 * offer message will indicate if the host supports sub-channels.
886 * The guest is free to ask for sub-channels to be offered and can
887 * open these sub-channels as a normal "primary" channel. However,
888 * all sub-channels will have the same type and instance guids as the
889 * primary channel. Requests sent on a given channel will result in a
890 * response on the same channel.
891 */
892
893 /*
894 * Sub-channel creation callback. This callback will be called in
895 * process context when a sub-channel offer is received from the host.
896 * The guest can open the sub-channel in the context of this callback.
897 */
898 void (*sc_creation_callback)(struct vmbus_channel *new_sc);
899
900 /*
901 * Channel rescind callback. Some channels (the hvsock ones), need to
902 * register a callback which is invoked in vmbus_onoffer_rescind().
903 */
904 void (*chn_rescind_callback)(struct vmbus_channel *channel);
905
906 /*
907 * All Sub-channels of a primary channel are linked here.
908 */
909 struct list_head sc_list;
910 /*
911 * The primary channel this sub-channel belongs to.
912 * This will be NULL for the primary channel.
913 */
914 struct vmbus_channel *primary_channel;
915 /*
916 * Support per-channel state for use by vmbus drivers.
917 */
918 void *per_channel_state;
919
920 /*
921 * Defer freeing channel until after all cpu's have
922 * gone through grace period.
923 */
924 struct rcu_head rcu;
925
926 /*
927 * For sysfs per-channel properties.
928 */
929 struct kobject kobj;
930
931 /*
932 * For performance critical channels (storage, networking
933 * etc,), Hyper-V has a mechanism to enhance the throughput
934 * at the expense of latency:
935 * When the host is to be signaled, we just set a bit in a shared page
936 * and this bit will be inspected by the hypervisor within a certain
937 * window and if the bit is set, the host will be signaled. The window
938 * of time is the monitor latency - currently around 100 usecs. This
939 * mechanism improves throughput by:
940 *
941 * A) Making the host more efficient - each time it wakes up,
942 * potentially it will process more number of packets. The
943 * monitor latency allows a batch to build up.
944 * B) By deferring the hypercall to signal, we will also minimize
945 * the interrupts.
946 *
947 * Clearly, these optimizations improve throughput at the expense of
948 * latency. Furthermore, since the channel is shared for both
949 * control and data messages, control messages currently suffer
950 * unnecessary latency adversely impacting performance and boot
951 * time. To fix this issue, permit tagging the channel as being
952 * in "low latency" mode. In this mode, we will bypass the monitor
953 * mechanism.
954 */
955 bool low_latency;
956
957 bool probe_done;
958
959 /*
960 * Cache the device ID here for easy access; this is useful, in
961 * particular, in situations where the channel's device_obj has
962 * not been allocated/initialized yet.
963 */
964 u16 device_id;
965
966 /*
967 * We must offload the handling of the primary/sub channels
968 * from the single-threaded vmbus_connection.work_queue to
969 * two different workqueue, otherwise we can block
970 * vmbus_connection.work_queue and hang: see vmbus_process_offer().
971 */
972 struct work_struct add_channel_work;
973
974 /*
975 * Guest to host interrupts caused by the inbound ring buffer changing
976 * from full to not full while a packet is waiting.
977 */
978 u64 intr_in_full;
979
980 /*
981 * The total number of write operations that encountered a full
982 * outbound ring buffer.
983 */
984 u64 out_full_total;
985
986 /*
987 * The number of write operations that were the first to encounter a
988 * full outbound ring buffer.
989 */
990 u64 out_full_first;
991
992 /* enabling/disabling fuzz testing on the channel (default is false)*/
993 bool fuzz_testing_state;
994
995 /*
996 * Interrupt delay will delay the guest from emptying the ring buffer
997 * for a specific amount of time. The delay is in microseconds and will
998 * be between 1 to a maximum of 1000, its default is 0 (no delay).
999 * The Message delay will delay guest reading on a per message basis
1000 * in microseconds between 1 to 1000 with the default being 0
1001 * (no delay).
1002 */
1003 u32 fuzz_testing_interrupt_delay;
1004 u32 fuzz_testing_message_delay;
1005
1006 /* callback to generate a request ID from a request address */
1007 u64 (*next_request_id_callback)(struct vmbus_channel *channel, u64 rqst_addr);
1008 /* callback to retrieve a request address from a request ID */
1009 u64 (*request_addr_callback)(struct vmbus_channel *channel, u64 rqst_id);
1010
1011 /* request/transaction ids for VMBus */
1012 struct vmbus_requestor requestor;
1013 u32 rqstor_size;
1014
1015 /* The max size of a packet on this channel */
1016 u32 max_pkt_size;
1017
1018 /* function to mmap ring buffer memory to the channel's sysfs ring attribute */
1019 int (*mmap_prepare_ring_buffer)(struct vmbus_channel *channel, struct vm_area_desc *desc);
1020
1021 /* boolean to control visibility of sysfs for ring buffer */
1022 bool ring_sysfs_visible;
1023 /* The ring buffer is encrypted */
1024 bool co_ring_buffer;
1025 /* The external memory is encrypted */
1026 bool co_external_memory;
1027 };
1028
1029 #define lock_requestor(channel, flags) \
1030 do { \
1031 struct vmbus_requestor *rqstor = &(channel)->requestor; \
1032 \
1033 spin_lock_irqsave(&rqstor->req_lock, flags); \
1034 } while (0)
1035
unlock_requestor(struct vmbus_channel * channel,unsigned long flags)1036 static __always_inline void unlock_requestor(struct vmbus_channel *channel,
1037 unsigned long flags)
1038 {
1039 struct vmbus_requestor *rqstor = &channel->requestor;
1040
1041 spin_unlock_irqrestore(&rqstor->req_lock, flags);
1042 }
1043
1044 u64 vmbus_next_request_id(struct vmbus_channel *channel, u64 rqst_addr);
1045 u64 __vmbus_request_addr_match(struct vmbus_channel *channel, u64 trans_id,
1046 u64 rqst_addr);
1047 u64 vmbus_request_addr_match(struct vmbus_channel *channel, u64 trans_id,
1048 u64 rqst_addr);
1049 u64 vmbus_request_addr(struct vmbus_channel *channel, u64 trans_id);
1050
is_co_ring_buffer(const struct vmbus_channel_offer_channel * o)1051 static inline bool is_co_ring_buffer(const struct vmbus_channel_offer_channel *o)
1052 {
1053 return !!(o->offer.chn_flags & VMBUS_CHANNEL_CONFIDENTIAL_RING_BUFFER);
1054 }
1055
is_co_external_memory(const struct vmbus_channel_offer_channel * o)1056 static inline bool is_co_external_memory(const struct vmbus_channel_offer_channel *o)
1057 {
1058 return !!(o->offer.chn_flags & VMBUS_CHANNEL_CONFIDENTIAL_EXTERNAL_MEMORY);
1059 }
1060
is_hvsock_offer(const struct vmbus_channel_offer_channel * o)1061 static inline bool is_hvsock_offer(const struct vmbus_channel_offer_channel *o)
1062 {
1063 return !!(o->offer.chn_flags & VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER);
1064 }
1065
is_hvsock_channel(const struct vmbus_channel * c)1066 static inline bool is_hvsock_channel(const struct vmbus_channel *c)
1067 {
1068 return is_hvsock_offer(&c->offermsg);
1069 }
1070
is_sub_channel(const struct vmbus_channel * c)1071 static inline bool is_sub_channel(const struct vmbus_channel *c)
1072 {
1073 return c->offermsg.offer.sub_channel_index != 0;
1074 }
1075
set_channel_read_mode(struct vmbus_channel * c,enum hv_callback_mode mode)1076 static inline void set_channel_read_mode(struct vmbus_channel *c,
1077 enum hv_callback_mode mode)
1078 {
1079 c->callback_mode = mode;
1080 }
1081
set_per_channel_state(struct vmbus_channel * c,void * s)1082 static inline void set_per_channel_state(struct vmbus_channel *c, void *s)
1083 {
1084 c->per_channel_state = s;
1085 }
1086
get_per_channel_state(struct vmbus_channel * c)1087 static inline void *get_per_channel_state(struct vmbus_channel *c)
1088 {
1089 return c->per_channel_state;
1090 }
1091
set_channel_pending_send_size(struct vmbus_channel * c,u32 size)1092 static inline void set_channel_pending_send_size(struct vmbus_channel *c,
1093 u32 size)
1094 {
1095 unsigned long flags;
1096
1097 if (size) {
1098 spin_lock_irqsave(&c->outbound.ring_lock, flags);
1099 ++c->out_full_total;
1100
1101 if (!c->out_full_flag) {
1102 ++c->out_full_first;
1103 c->out_full_flag = true;
1104 }
1105 spin_unlock_irqrestore(&c->outbound.ring_lock, flags);
1106 } else {
1107 c->out_full_flag = false;
1108 }
1109
1110 c->outbound.ring_buffer->pending_send_sz = size;
1111 }
1112
1113 void vmbus_onmessage(struct vmbus_channel_message_header *hdr);
1114
1115 int vmbus_request_offers(void);
1116
1117 /*
1118 * APIs for managing sub-channels.
1119 */
1120
1121 void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel,
1122 void (*sc_cr_cb)(struct vmbus_channel *new_sc));
1123
1124 void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel,
1125 void (*chn_rescind_cb)(struct vmbus_channel *));
1126
1127 /* The format must be the same as struct vmdata_gpa_direct */
1128 struct vmbus_channel_packet_page_buffer {
1129 u16 type;
1130 u16 dataoffset8;
1131 u16 length8;
1132 u16 flags;
1133 u64 transactionid;
1134 u32 reserved;
1135 u32 rangecount;
1136 struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT];
1137 } __packed;
1138
1139 /* The format must be the same as struct vmdata_gpa_direct */
1140 struct vmbus_channel_packet_multipage_buffer {
1141 u16 type;
1142 u16 dataoffset8;
1143 u16 length8;
1144 u16 flags;
1145 u64 transactionid;
1146 u32 reserved;
1147 u32 rangecount; /* Always 1 in this case */
1148 struct hv_multipage_buffer range;
1149 } __packed;
1150
1151 /* The format must be the same as struct vmdata_gpa_direct */
1152 struct vmbus_packet_mpb_array {
1153 u16 type;
1154 u16 dataoffset8;
1155 u16 length8;
1156 u16 flags;
1157 u64 transactionid;
1158 u32 reserved;
1159 u32 rangecount; /* Always 1 in this case */
1160 struct hv_mpb_array range;
1161 } __packed;
1162
1163 int vmbus_alloc_ring(struct vmbus_channel *channel,
1164 u32 send_size, u32 recv_size);
1165 void vmbus_free_ring(struct vmbus_channel *channel);
1166
1167 int vmbus_connect_ring(struct vmbus_channel *channel,
1168 void (*onchannel_callback)(void *context),
1169 void *context);
1170 int vmbus_disconnect_ring(struct vmbus_channel *channel);
1171
1172 extern int vmbus_open(struct vmbus_channel *channel,
1173 u32 send_ringbuffersize,
1174 u32 recv_ringbuffersize,
1175 void *userdata,
1176 u32 userdatalen,
1177 void (*onchannel_callback)(void *context),
1178 void *context);
1179
1180 extern void vmbus_close(struct vmbus_channel *channel);
1181
1182 extern int vmbus_sendpacket_getid(struct vmbus_channel *channel,
1183 void *buffer,
1184 u32 bufferLen,
1185 u64 requestid,
1186 u64 *trans_id,
1187 enum vmbus_packet_type type,
1188 u32 flags);
1189 extern int vmbus_sendpacket(struct vmbus_channel *channel,
1190 void *buffer,
1191 u32 bufferLen,
1192 u64 requestid,
1193 enum vmbus_packet_type type,
1194 u32 flags);
1195
1196 extern int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
1197 struct vmbus_packet_mpb_array *mpb,
1198 u32 desc_size,
1199 void *buffer,
1200 u32 bufferlen,
1201 u64 requestid);
1202
1203 extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
1204 void *kbuffer,
1205 u32 size,
1206 struct vmbus_gpadl *gpadl);
1207
1208 extern int vmbus_establish_gpadl_caller_decrypted(struct vmbus_channel *channel,
1209 void *kbuffer,
1210 u32 size,
1211 struct vmbus_gpadl *gpadl);
1212
1213 extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
1214 struct vmbus_gpadl *gpadl);
1215
1216 extern void *vmbus_alloc_buffer(struct vmbus_channel *channel,
1217 u32 size,
1218 struct page ***chunks_out,
1219 u32 *chunk_cnt_out);
1220
1221 extern void vmbus_free_buffer(void *addr, struct page **chunks, u32 chunk_cnt);
1222
1223 void vmbus_reset_channel_cb(struct vmbus_channel *channel);
1224
1225 extern int vmbus_recvpacket(struct vmbus_channel *channel,
1226 void *buffer,
1227 u32 bufferlen,
1228 u32 *buffer_actual_len,
1229 u64 *requestid);
1230
1231 extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
1232 void *buffer,
1233 u32 bufferlen,
1234 u32 *buffer_actual_len,
1235 u64 *requestid);
1236
1237 /* Base driver object */
1238 struct hv_driver {
1239 const char *name;
1240
1241 /*
1242 * A hvsock offer, which has a VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER
1243 * channel flag, actually doesn't mean a synthetic device because the
1244 * offer's if_type/if_instance can change for every new hvsock
1245 * connection.
1246 *
1247 * However, to facilitate the notification of new-offer/rescind-offer
1248 * from vmbus driver to hvsock driver, we can handle hvsock offer as
1249 * a special vmbus device, and hence we need the below flag to
1250 * indicate if the driver is the hvsock driver or not: we need to
1251 * specially treat the hvosck offer & driver in vmbus_match().
1252 */
1253 bool hvsock;
1254
1255 /* the device type supported by this driver */
1256 guid_t dev_type;
1257 const struct hv_vmbus_device_id *id_table;
1258
1259 struct device_driver driver;
1260
1261 /* dynamic device GUID's */
1262 struct {
1263 spinlock_t lock;
1264 struct list_head list;
1265 } dynids;
1266
1267 int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *);
1268 void (*remove)(struct hv_device *dev);
1269 void (*shutdown)(struct hv_device *);
1270
1271 int (*suspend)(struct hv_device *);
1272 int (*resume)(struct hv_device *);
1273
1274 };
1275
1276 /* Base device object */
1277 struct hv_device {
1278 /* the device type id of this device */
1279 guid_t dev_type;
1280
1281 /* the device instance id of this device */
1282 guid_t dev_instance;
1283 u16 vendor_id;
1284 u16 device_id;
1285
1286 struct device device;
1287
1288 struct vmbus_channel *channel;
1289 struct kset *channels_kset;
1290 struct device_dma_parameters dma_parms;
1291 u64 dma_mask;
1292
1293 /* place holder to keep track of the dir for hv device in debugfs */
1294 struct dentry *debug_dir;
1295
1296 };
1297
1298
1299 #define device_to_hv_device(d) container_of_const(d, struct hv_device, device)
1300 #define drv_to_hv_drv(d) container_of_const(d, struct hv_driver, driver)
1301
hv_set_drvdata(struct hv_device * dev,void * data)1302 static inline void hv_set_drvdata(struct hv_device *dev, void *data)
1303 {
1304 dev_set_drvdata(&dev->device, data);
1305 }
1306
hv_get_drvdata(struct hv_device * dev)1307 static inline void *hv_get_drvdata(struct hv_device *dev)
1308 {
1309 return dev_get_drvdata(&dev->device);
1310 }
1311
1312 struct device *hv_get_vmbus_root_device(void);
1313
1314 #if IS_ENABLED(CONFIG_HYPERV_VMBUS)
1315 bool hv_vmbus_exists(void);
1316 #else
hv_vmbus_exists(void)1317 static inline bool hv_vmbus_exists(void) { return false; }
1318 #endif
1319
1320 struct hv_ring_buffer_debug_info {
1321 u32 current_interrupt_mask;
1322 u32 current_read_index;
1323 u32 current_write_index;
1324 u32 bytes_avail_toread;
1325 u32 bytes_avail_towrite;
1326 };
1327
1328
1329 int hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
1330 struct hv_ring_buffer_debug_info *debug_info);
1331
1332 bool hv_ringbuffer_spinlock_busy(struct vmbus_channel *channel);
1333
1334 /* Vmbus interface */
1335 #define vmbus_driver_register(driver) \
1336 __vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
1337 int __must_check __vmbus_driver_register(struct hv_driver *hv_driver,
1338 struct module *owner,
1339 const char *mod_name);
1340 void vmbus_driver_unregister(struct hv_driver *hv_driver);
1341
1342 void vmbus_hvsock_device_unregister(struct vmbus_channel *channel);
1343
1344 int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
1345 resource_size_t min, resource_size_t max,
1346 resource_size_t size, resource_size_t align,
1347 bool fb_overlap_ok);
1348 void vmbus_free_mmio(resource_size_t start, resource_size_t size);
1349
1350 void vmbus_initiate_unload(bool crash);
1351 void vmbus_set_skip_unload(bool skip);
1352
1353 /*
1354 * GUID definitions of various offer types - services offered to the guest.
1355 */
1356
1357 /*
1358 * Network GUID
1359 * {f8615163-df3e-46c5-913f-f2d2f965ed0e}
1360 */
1361 #define HV_NIC_GUID \
1362 .guid = GUID_INIT(0xf8615163, 0xdf3e, 0x46c5, 0x91, 0x3f, \
1363 0xf2, 0xd2, 0xf9, 0x65, 0xed, 0x0e)
1364
1365 /*
1366 * IDE GUID
1367 * {32412632-86cb-44a2-9b5c-50d1417354f5}
1368 */
1369 #define HV_IDE_GUID \
1370 .guid = GUID_INIT(0x32412632, 0x86cb, 0x44a2, 0x9b, 0x5c, \
1371 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
1372
1373 /*
1374 * SCSI GUID
1375 * {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f}
1376 */
1377 #define HV_SCSI_GUID \
1378 .guid = GUID_INIT(0xba6163d9, 0x04a1, 0x4d29, 0xb6, 0x05, \
1379 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
1380
1381 /*
1382 * Shutdown GUID
1383 * {0e0b6031-5213-4934-818b-38d90ced39db}
1384 */
1385 #define HV_SHUTDOWN_GUID \
1386 .guid = GUID_INIT(0x0e0b6031, 0x5213, 0x4934, 0x81, 0x8b, \
1387 0x38, 0xd9, 0x0c, 0xed, 0x39, 0xdb)
1388
1389 /*
1390 * Time Synch GUID
1391 * {9527E630-D0AE-497b-ADCE-E80AB0175CAF}
1392 */
1393 #define HV_TS_GUID \
1394 .guid = GUID_INIT(0x9527e630, 0xd0ae, 0x497b, 0xad, 0xce, \
1395 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)
1396
1397 /*
1398 * Heartbeat GUID
1399 * {57164f39-9115-4e78-ab55-382f3bd5422d}
1400 */
1401 #define HV_HEART_BEAT_GUID \
1402 .guid = GUID_INIT(0x57164f39, 0x9115, 0x4e78, 0xab, 0x55, \
1403 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)
1404
1405 /*
1406 * KVP GUID
1407 * {a9a0f4e7-5a45-4d96-b827-8a841e8c03e6}
1408 */
1409 #define HV_KVP_GUID \
1410 .guid = GUID_INIT(0xa9a0f4e7, 0x5a45, 0x4d96, 0xb8, 0x27, \
1411 0x8a, 0x84, 0x1e, 0x8c, 0x03, 0xe6)
1412
1413 /*
1414 * Dynamic memory GUID
1415 * {525074dc-8985-46e2-8057-a307dc18a502}
1416 */
1417 #define HV_DM_GUID \
1418 .guid = GUID_INIT(0x525074dc, 0x8985, 0x46e2, 0x80, 0x57, \
1419 0xa3, 0x07, 0xdc, 0x18, 0xa5, 0x02)
1420
1421 /*
1422 * Mouse GUID
1423 * {cfa8b69e-5b4a-4cc0-b98b-8ba1a1f3f95a}
1424 */
1425 #define HV_MOUSE_GUID \
1426 .guid = GUID_INIT(0xcfa8b69e, 0x5b4a, 0x4cc0, 0xb9, 0x8b, \
1427 0x8b, 0xa1, 0xa1, 0xf3, 0xf9, 0x5a)
1428
1429 /*
1430 * Keyboard GUID
1431 * {f912ad6d-2b17-48ea-bd65-f927a61c7684}
1432 */
1433 #define HV_KBD_GUID \
1434 .guid = GUID_INIT(0xf912ad6d, 0x2b17, 0x48ea, 0xbd, 0x65, \
1435 0xf9, 0x27, 0xa6, 0x1c, 0x76, 0x84)
1436
1437 /*
1438 * VSS (Backup/Restore) GUID
1439 */
1440 #define HV_VSS_GUID \
1441 .guid = GUID_INIT(0x35fa2e29, 0xea23, 0x4236, 0x96, 0xae, \
1442 0x3a, 0x6e, 0xba, 0xcb, 0xa4, 0x40)
1443 /*
1444 * Synthetic Video GUID
1445 * {DA0A7802-E377-4aac-8E77-0558EB1073F8}
1446 */
1447 #define HV_SYNTHVID_GUID \
1448 .guid = GUID_INIT(0xda0a7802, 0xe377, 0x4aac, 0x8e, 0x77, \
1449 0x05, 0x58, 0xeb, 0x10, 0x73, 0xf8)
1450
1451 /*
1452 * Synthetic FC GUID
1453 * {2f9bcc4a-0069-4af3-b76b-6fd0be528cda}
1454 */
1455 #define HV_SYNTHFC_GUID \
1456 .guid = GUID_INIT(0x2f9bcc4a, 0x0069, 0x4af3, 0xb7, 0x6b, \
1457 0x6f, 0xd0, 0xbe, 0x52, 0x8c, 0xda)
1458
1459 /*
1460 * Guest File Copy Service
1461 * {34D14BE3-DEE4-41c8-9AE7-6B174977C192}
1462 */
1463
1464 #define HV_FCOPY_GUID \
1465 .guid = GUID_INIT(0x34d14be3, 0xdee4, 0x41c8, 0x9a, 0xe7, \
1466 0x6b, 0x17, 0x49, 0x77, 0xc1, 0x92)
1467
1468 /*
1469 * NetworkDirect. This is the guest RDMA service.
1470 * {8c2eaf3d-32a7-4b09-ab99-bd1f1c86b501}
1471 */
1472 #define HV_ND_GUID \
1473 .guid = GUID_INIT(0x8c2eaf3d, 0x32a7, 0x4b09, 0xab, 0x99, \
1474 0xbd, 0x1f, 0x1c, 0x86, 0xb5, 0x01)
1475
1476 /*
1477 * PCI Express Pass Through
1478 * {44C4F61D-4444-4400-9D52-802E27EDE19F}
1479 */
1480
1481 #define HV_PCIE_GUID \
1482 .guid = GUID_INIT(0x44c4f61d, 0x4444, 0x4400, 0x9d, 0x52, \
1483 0x80, 0x2e, 0x27, 0xed, 0xe1, 0x9f)
1484
1485 /*
1486 * Linux doesn't support these 4 devices: the first two are for
1487 * Automatic Virtual Machine Activation, the third is for
1488 * Remote Desktop Virtualization, and the fourth is Initial
1489 * Machine Configuration (IMC) used only by Windows guests.
1490 * {f8e65716-3cb3-4a06-9a60-1889c5cccab5}
1491 * {3375baf4-9e15-4b30-b765-67acb10d607b}
1492 * {276aacf4-ac15-426c-98dd-7521ad3f01fe}
1493 * {c376c1c3-d276-48d2-90a9-c04748072c60}
1494 */
1495
1496 #define HV_AVMA1_GUID \
1497 .guid = GUID_INIT(0xf8e65716, 0x3cb3, 0x4a06, 0x9a, 0x60, \
1498 0x18, 0x89, 0xc5, 0xcc, 0xca, 0xb5)
1499
1500 #define HV_AVMA2_GUID \
1501 .guid = GUID_INIT(0x3375baf4, 0x9e15, 0x4b30, 0xb7, 0x65, \
1502 0x67, 0xac, 0xb1, 0x0d, 0x60, 0x7b)
1503
1504 #define HV_RDV_GUID \
1505 .guid = GUID_INIT(0x276aacf4, 0xac15, 0x426c, 0x98, 0xdd, \
1506 0x75, 0x21, 0xad, 0x3f, 0x01, 0xfe)
1507
1508 #define HV_IMC_GUID \
1509 .guid = GUID_INIT(0xc376c1c3, 0xd276, 0x48d2, 0x90, 0xa9, \
1510 0xc0, 0x47, 0x48, 0x07, 0x2c, 0x60)
1511
1512 /*
1513 * Common header for Hyper-V ICs
1514 */
1515
1516 #define ICMSGTYPE_NEGOTIATE 0
1517 #define ICMSGTYPE_HEARTBEAT 1
1518 #define ICMSGTYPE_KVPEXCHANGE 2
1519 #define ICMSGTYPE_SHUTDOWN 3
1520 #define ICMSGTYPE_TIMESYNC 4
1521 #define ICMSGTYPE_VSS 5
1522 #define ICMSGTYPE_FCOPY 7
1523
1524 #define ICMSGHDRFLAG_TRANSACTION 1
1525 #define ICMSGHDRFLAG_REQUEST 2
1526 #define ICMSGHDRFLAG_RESPONSE 4
1527
1528
1529 /*
1530 * While we want to handle util services as regular devices,
1531 * there is only one instance of each of these services; so
1532 * we statically allocate the service specific state.
1533 */
1534
1535 struct hv_util_service {
1536 u8 *recv_buffer;
1537 void *channel;
1538 void (*util_cb)(void *);
1539 int (*util_init)(struct hv_util_service *);
1540 int (*util_init_transport)(void);
1541 void (*util_deinit)(void);
1542 int (*util_pre_suspend)(void);
1543 int (*util_pre_resume)(void);
1544 };
1545
1546 struct vmbuspipe_hdr {
1547 u32 flags;
1548 u32 msgsize;
1549 } __packed;
1550
1551 struct ic_version {
1552 u16 major;
1553 u16 minor;
1554 } __packed;
1555
1556 struct icmsg_hdr {
1557 struct ic_version icverframe;
1558 u16 icmsgtype;
1559 struct ic_version icvermsg;
1560 u16 icmsgsize;
1561 u32 status;
1562 u8 ictransaction_id;
1563 u8 icflags;
1564 u8 reserved[2];
1565 } __packed;
1566
1567 #define IC_VERSION_NEGOTIATION_MAX_VER_COUNT 100
1568 #define ICMSG_HDR (sizeof(struct vmbuspipe_hdr) + sizeof(struct icmsg_hdr))
1569 #define ICMSG_NEGOTIATE_PKT_SIZE(icframe_vercnt, icmsg_vercnt) \
1570 (ICMSG_HDR + sizeof(struct icmsg_negotiate) + \
1571 (((icframe_vercnt) + (icmsg_vercnt)) * sizeof(struct ic_version)))
1572
1573 struct icmsg_negotiate {
1574 u16 icframe_vercnt;
1575 u16 icmsg_vercnt;
1576 u32 reserved;
1577 struct ic_version icversion_data[]; /* any size array */
1578 } __packed;
1579
1580 struct shutdown_msg_data {
1581 u32 reason_code;
1582 u32 timeout_seconds;
1583 u32 flags;
1584 u8 display_message[2048];
1585 } __packed;
1586
1587 struct heartbeat_msg_data {
1588 u64 seq_num;
1589 u32 reserved[8];
1590 } __packed;
1591
1592 /* Time Sync IC defs */
1593 #define ICTIMESYNCFLAG_PROBE 0
1594 #define ICTIMESYNCFLAG_SYNC 1
1595 #define ICTIMESYNCFLAG_SAMPLE 2
1596
1597 #ifdef __x86_64__
1598 #define WLTIMEDELTA 116444736000000000L /* in 100ns unit */
1599 #else
1600 #define WLTIMEDELTA 116444736000000000LL
1601 #endif
1602
1603 struct ictimesync_data {
1604 u64 parenttime;
1605 u64 childtime;
1606 u64 roundtriptime;
1607 u8 flags;
1608 } __packed;
1609
1610 struct ictimesync_ref_data {
1611 u64 parenttime;
1612 u64 vmreferencetime;
1613 u8 flags;
1614 char leapflags;
1615 char stratum;
1616 u8 reserved[3];
1617 } __packed;
1618
1619 struct hyperv_service_callback {
1620 u8 msg_type;
1621 char *log_msg;
1622 guid_t data;
1623 struct vmbus_channel *channel;
1624 void (*callback)(void *context);
1625 };
1626
1627 struct hv_dma_range {
1628 dma_addr_t dma;
1629 u32 mapping_size;
1630 };
1631
1632 #define MAX_SRV_VER 0x7ffffff
1633 extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, u8 *buf, u32 buflen,
1634 const int *fw_version, int fw_vercnt,
1635 const int *srv_version, int srv_vercnt,
1636 int *nego_fw_version, int *nego_srv_version);
1637
1638 void hv_process_channel_removal(struct vmbus_channel *channel);
1639
1640 void vmbus_setevent(struct vmbus_channel *channel);
1641 /*
1642 * Negotiated version with the Host.
1643 */
1644
1645 extern __u32 vmbus_proto_version;
1646
1647 int vmbus_send_tl_connect_request(const guid_t *shv_guest_servie_id,
1648 const guid_t *shv_host_servie_id);
1649 int vmbus_send_modifychannel(struct vmbus_channel *channel, u32 target_vp);
1650 void vmbus_set_event(struct vmbus_channel *channel);
1651 int vmbus_channel_set_cpu(struct vmbus_channel *channel, u32 target_cpu);
1652
1653 /* Get the start of the ring buffer. */
1654 static inline void *
hv_get_ring_buffer(const struct hv_ring_buffer_info * ring_info)1655 hv_get_ring_buffer(const struct hv_ring_buffer_info *ring_info)
1656 {
1657 return ring_info->ring_buffer->buffer;
1658 }
1659
1660 /*
1661 * Mask off host interrupt callback notifications
1662 */
hv_begin_read(struct hv_ring_buffer_info * rbi)1663 static inline void hv_begin_read(struct hv_ring_buffer_info *rbi)
1664 {
1665 rbi->ring_buffer->interrupt_mask = 1;
1666
1667 /* make sure mask update is not reordered */
1668 virt_mb();
1669 }
1670
1671 /*
1672 * Re-enable host callback and return number of outstanding bytes
1673 */
hv_end_read(struct hv_ring_buffer_info * rbi)1674 static inline u32 hv_end_read(struct hv_ring_buffer_info *rbi)
1675 {
1676
1677 rbi->ring_buffer->interrupt_mask = 0;
1678
1679 /* make sure mask update is not reordered */
1680 virt_mb();
1681
1682 /*
1683 * Now check to see if the ring buffer is still empty.
1684 * If it is not, we raced and we need to process new
1685 * incoming messages.
1686 */
1687 return hv_get_bytes_to_read(rbi);
1688 }
1689
1690 /*
1691 * An API to support in-place processing of incoming VMBUS packets.
1692 */
1693
1694 /* Get data payload associated with descriptor */
hv_pkt_data(const struct vmpacket_descriptor * desc)1695 static inline void *hv_pkt_data(const struct vmpacket_descriptor *desc)
1696 {
1697 return (void *)((unsigned long)desc + (desc->offset8 << 3));
1698 }
1699
1700 /* Get data size associated with descriptor */
hv_pkt_datalen(const struct vmpacket_descriptor * desc)1701 static inline u32 hv_pkt_datalen(const struct vmpacket_descriptor *desc)
1702 {
1703 return (desc->len8 << 3) - (desc->offset8 << 3);
1704 }
1705
1706 /* Get packet length associated with descriptor */
hv_pkt_len(const struct vmpacket_descriptor * desc)1707 static inline u32 hv_pkt_len(const struct vmpacket_descriptor *desc)
1708 {
1709 return desc->len8 << 3;
1710 }
1711
1712 struct vmpacket_descriptor *
1713 hv_pkt_iter_first(struct vmbus_channel *channel);
1714
1715 struct vmpacket_descriptor *
1716 __hv_pkt_iter_next(struct vmbus_channel *channel,
1717 const struct vmpacket_descriptor *pkt);
1718
1719 void hv_pkt_iter_close(struct vmbus_channel *channel);
1720
1721 static inline struct vmpacket_descriptor *
hv_pkt_iter_next(struct vmbus_channel * channel,const struct vmpacket_descriptor * pkt)1722 hv_pkt_iter_next(struct vmbus_channel *channel,
1723 const struct vmpacket_descriptor *pkt)
1724 {
1725 struct vmpacket_descriptor *nxt;
1726
1727 nxt = __hv_pkt_iter_next(channel, pkt);
1728 if (!nxt)
1729 hv_pkt_iter_close(channel);
1730
1731 return nxt;
1732 }
1733
1734 #define foreach_vmbus_pkt(pkt, channel) \
1735 for (pkt = hv_pkt_iter_first(channel); pkt; \
1736 pkt = hv_pkt_iter_next(channel, pkt))
1737
1738 /*
1739 * Interface for passing data between SR-IOV PF and VF drivers. The VF driver
1740 * sends requests to read and write blocks. Each block must be 128 bytes or
1741 * smaller. Optionally, the VF driver can register a callback function which
1742 * will be invoked when the host says that one or more of the first 64 block
1743 * IDs is "invalid" which means that the VF driver should reread them.
1744 */
1745 #define HV_CONFIG_BLOCK_SIZE_MAX 128
1746
1747 int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len,
1748 unsigned int block_id, unsigned int *bytes_returned);
1749 int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
1750 unsigned int block_id);
1751 int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
1752 void (*block_invalidate)(void *context,
1753 u64 block_mask));
1754
1755 struct hyperv_pci_block_ops {
1756 int (*read_block)(struct pci_dev *dev, void *buf, unsigned int buf_len,
1757 unsigned int block_id, unsigned int *bytes_returned);
1758 int (*write_block)(struct pci_dev *dev, void *buf, unsigned int len,
1759 unsigned int block_id);
1760 int (*reg_blk_invalidate)(struct pci_dev *dev, void *context,
1761 void (*block_invalidate)(void *context,
1762 u64 block_mask));
1763 };
1764
1765 extern struct hyperv_pci_block_ops hvpci_block_ops;
1766
virt_to_hvpfn(void * addr)1767 static inline unsigned long virt_to_hvpfn(void *addr)
1768 {
1769 phys_addr_t paddr;
1770
1771 if (is_vmalloc_addr(addr))
1772 paddr = page_to_phys(vmalloc_to_page(addr)) +
1773 offset_in_page(addr);
1774 else
1775 paddr = __pa(addr);
1776
1777 return paddr >> HV_HYP_PAGE_SHIFT;
1778 }
1779
1780 #define NR_HV_HYP_PAGES_IN_PAGE (PAGE_SIZE / HV_HYP_PAGE_SIZE)
1781 #define offset_in_hvpage(ptr) ((unsigned long)(ptr) & ~HV_HYP_PAGE_MASK)
1782 #define HVPFN_UP(x) (((x) + HV_HYP_PAGE_SIZE-1) >> HV_HYP_PAGE_SHIFT)
1783 #define HVPFN_DOWN(x) ((x) >> HV_HYP_PAGE_SHIFT)
1784 #define page_to_hvpfn(page) (page_to_pfn(page) * NR_HV_HYP_PAGES_IN_PAGE)
1785
1786 #endif /* _HYPERV_H */
1787