1 /*
2 * An implementation of key value pair (KVP) functionality for Linux.
3 *
4 *
5 * Copyright (C) 2010, Novell, Inc.
6 * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
15 * NON INFRINGEMENT. See the GNU General Public License for more
16 * details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 */
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25 #include <linux/net.h>
26 #include <linux/nls.h>
27 #include <linux/connector.h>
28 #include <linux/workqueue.h>
29 #include <linux/hyperv.h>
30
31 #include "hyperv_vmbus.h"
32 #include "hv_utils_transport.h"
33
34 /*
35 * Pre win8 version numbers used in ws2008 and ws 2008 r2 (win7)
36 */
37 #define WS2008_SRV_MAJOR 1
38 #define WS2008_SRV_MINOR 0
39 #define WS2008_SRV_VERSION (WS2008_SRV_MAJOR << 16 | WS2008_SRV_MINOR)
40
41 #define WIN7_SRV_MAJOR 3
42 #define WIN7_SRV_MINOR 0
43 #define WIN7_SRV_VERSION (WIN7_SRV_MAJOR << 16 | WIN7_SRV_MINOR)
44
45 #define WIN8_SRV_MAJOR 4
46 #define WIN8_SRV_MINOR 0
47 #define WIN8_SRV_VERSION (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR)
48
49 /*
50 * Global state maintained for transaction that is being processed. For a class
51 * of integration services, including the "KVP service", the specified protocol
52 * is a "request/response" protocol which means that there can only be single
53 * outstanding transaction from the host at any given point in time. We use
54 * this to simplify memory management in this driver - we cache and process
55 * only one message at a time.
56 *
57 * While the request/response protocol is guaranteed by the host, we further
58 * ensure this by serializing packet processing in this driver - we do not
59 * read additional packets from the VMBUs until the current packet is fully
60 * handled.
61 */
62
63 static struct {
64 int state; /* hvutil_device_state */
65 int recv_len; /* number of bytes received. */
66 struct hv_kvp_msg *kvp_msg; /* current message */
67 struct vmbus_channel *recv_channel; /* chn we got the request */
68 u64 recv_req_id; /* request ID. */
69 } kvp_transaction;
70
71 /*
72 * This state maintains the version number registered by the daemon.
73 */
74 static int dm_reg_value;
75
76 static void kvp_send_key(struct work_struct *dummy);
77
78
79 static void kvp_respond_to_host(struct hv_kvp_msg *msg, int error);
80 static void kvp_timeout_func(struct work_struct *dummy);
81 static void kvp_host_handshake_func(struct work_struct *dummy);
82 static void kvp_register(int);
83
84 static DECLARE_DELAYED_WORK(kvp_timeout_work, kvp_timeout_func);
85 static DECLARE_DELAYED_WORK(kvp_host_handshake_work, kvp_host_handshake_func);
86 static DECLARE_WORK(kvp_sendkey_work, kvp_send_key);
87
88 static const char kvp_devname[] = "vmbus/hv_kvp";
89 static u8 *recv_buffer;
90 static struct hvutil_transport *hvt;
91 static struct completion release_event;
92 /*
93 * Register the kernel component with the user-level daemon.
94 * As part of this registration, pass the LIC version number.
95 * This number has no meaning, it satisfies the registration protocol.
96 */
97 #define HV_DRV_VERSION "3.1"
98
kvp_poll_wrapper(void * channel)99 static void kvp_poll_wrapper(void *channel)
100 {
101 /* Transaction is finished, reset the state here to avoid races. */
102 kvp_transaction.state = HVUTIL_READY;
103 hv_kvp_onchannelcallback(channel);
104 }
105
106 static void
kvp_register(int reg_value)107 kvp_register(int reg_value)
108 {
109
110 struct hv_kvp_msg *kvp_msg;
111 char *version;
112
113 kvp_msg = kzalloc(sizeof(*kvp_msg), GFP_KERNEL);
114
115 if (kvp_msg) {
116 version = kvp_msg->body.kvp_register.version;
117 kvp_msg->kvp_hdr.operation = reg_value;
118 strcpy(version, HV_DRV_VERSION);
119
120 hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg));
121 kfree(kvp_msg);
122 }
123 }
124
kvp_timeout_func(struct work_struct * dummy)125 static void kvp_timeout_func(struct work_struct *dummy)
126 {
127 /*
128 * If the timer fires, the user-mode component has not responded;
129 * process the pending transaction.
130 */
131 kvp_respond_to_host(NULL, HV_E_FAIL);
132
133 hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
134 }
135
kvp_host_handshake_func(struct work_struct * dummy)136 static void kvp_host_handshake_func(struct work_struct *dummy)
137 {
138 hv_poll_channel(kvp_transaction.recv_channel, hv_kvp_onchannelcallback);
139 }
140
kvp_handle_handshake(struct hv_kvp_msg * msg)141 static int kvp_handle_handshake(struct hv_kvp_msg *msg)
142 {
143 switch (msg->kvp_hdr.operation) {
144 case KVP_OP_REGISTER:
145 dm_reg_value = KVP_OP_REGISTER;
146 pr_info("KVP: IP injection functionality not available\n");
147 pr_info("KVP: Upgrade the KVP daemon\n");
148 break;
149 case KVP_OP_REGISTER1:
150 dm_reg_value = KVP_OP_REGISTER1;
151 break;
152 default:
153 pr_info("KVP: incompatible daemon\n");
154 pr_info("KVP: KVP version: %d, Daemon version: %d\n",
155 KVP_OP_REGISTER1, msg->kvp_hdr.operation);
156 return -EINVAL;
157 }
158
159 /*
160 * We have a compatible daemon; complete the handshake.
161 */
162 pr_debug("KVP: userspace daemon ver. %d registered\n",
163 KVP_OP_REGISTER);
164 kvp_register(dm_reg_value);
165
166 /*
167 * If we're still negotiating with the host cancel the timeout
168 * work to not poll the channel twice.
169 */
170 cancel_delayed_work_sync(&kvp_host_handshake_work);
171 hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
172
173 return 0;
174 }
175
176
177 /*
178 * Callback when data is received from user mode.
179 */
180
kvp_on_msg(void * msg,int len)181 static int kvp_on_msg(void *msg, int len)
182 {
183 struct hv_kvp_msg *message = (struct hv_kvp_msg *)msg;
184 struct hv_kvp_msg_enumerate *data;
185 int error = 0;
186
187 if (len < sizeof(*message))
188 return -EINVAL;
189
190 /*
191 * If we are negotiating the version information
192 * with the daemon; handle that first.
193 */
194
195 if (kvp_transaction.state < HVUTIL_READY) {
196 return kvp_handle_handshake(message);
197 }
198
199 /* We didn't send anything to userspace so the reply is spurious */
200 if (kvp_transaction.state < HVUTIL_USERSPACE_REQ)
201 return -EINVAL;
202
203 kvp_transaction.state = HVUTIL_USERSPACE_RECV;
204
205 /*
206 * Based on the version of the daemon, we propagate errors from the
207 * daemon differently.
208 */
209
210 data = &message->body.kvp_enum_data;
211
212 switch (dm_reg_value) {
213 case KVP_OP_REGISTER:
214 /*
215 * Null string is used to pass back error condition.
216 */
217 if (data->data.key[0] == 0)
218 error = HV_S_CONT;
219 break;
220
221 case KVP_OP_REGISTER1:
222 /*
223 * We use the message header information from
224 * the user level daemon to transmit errors.
225 */
226 error = message->error;
227 break;
228 }
229
230 /*
231 * Complete the transaction by forwarding the key value
232 * to the host. But first, cancel the timeout.
233 */
234 if (cancel_delayed_work_sync(&kvp_timeout_work)) {
235 kvp_respond_to_host(message, error);
236 hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
237 }
238
239 return 0;
240 }
241
242
process_ob_ipinfo(void * in_msg,void * out_msg,int op)243 static int process_ob_ipinfo(void *in_msg, void *out_msg, int op)
244 {
245 struct hv_kvp_msg *in = in_msg;
246 struct hv_kvp_ip_msg *out = out_msg;
247 int len;
248
249 switch (op) {
250 case KVP_OP_GET_IP_INFO:
251 /*
252 * Transform all parameters into utf16 encoding.
253 */
254 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.ip_addr,
255 strlen((char *)in->body.kvp_ip_val.ip_addr),
256 UTF16_HOST_ENDIAN,
257 (wchar_t *)out->kvp_ip_val.ip_addr,
258 MAX_IP_ADDR_SIZE);
259 if (len < 0)
260 return len;
261
262 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.sub_net,
263 strlen((char *)in->body.kvp_ip_val.sub_net),
264 UTF16_HOST_ENDIAN,
265 (wchar_t *)out->kvp_ip_val.sub_net,
266 MAX_IP_ADDR_SIZE);
267 if (len < 0)
268 return len;
269
270 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.gate_way,
271 strlen((char *)in->body.kvp_ip_val.gate_way),
272 UTF16_HOST_ENDIAN,
273 (wchar_t *)out->kvp_ip_val.gate_way,
274 MAX_GATEWAY_SIZE);
275 if (len < 0)
276 return len;
277
278 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.dns_addr,
279 strlen((char *)in->body.kvp_ip_val.dns_addr),
280 UTF16_HOST_ENDIAN,
281 (wchar_t *)out->kvp_ip_val.dns_addr,
282 MAX_IP_ADDR_SIZE);
283 if (len < 0)
284 return len;
285
286 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.adapter_id,
287 strlen((char *)in->body.kvp_ip_val.adapter_id),
288 UTF16_HOST_ENDIAN,
289 (wchar_t *)out->kvp_ip_val.adapter_id,
290 MAX_IP_ADDR_SIZE);
291 if (len < 0)
292 return len;
293
294 out->kvp_ip_val.dhcp_enabled =
295 in->body.kvp_ip_val.dhcp_enabled;
296 out->kvp_ip_val.addr_family =
297 in->body.kvp_ip_val.addr_family;
298 }
299
300 return 0;
301 }
302
process_ib_ipinfo(void * in_msg,void * out_msg,int op)303 static void process_ib_ipinfo(void *in_msg, void *out_msg, int op)
304 {
305 struct hv_kvp_ip_msg *in = in_msg;
306 struct hv_kvp_msg *out = out_msg;
307
308 switch (op) {
309 case KVP_OP_SET_IP_INFO:
310 /*
311 * Transform all parameters into utf8 encoding.
312 */
313 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.ip_addr,
314 MAX_IP_ADDR_SIZE,
315 UTF16_LITTLE_ENDIAN,
316 (__u8 *)out->body.kvp_ip_val.ip_addr,
317 MAX_IP_ADDR_SIZE);
318
319 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.sub_net,
320 MAX_IP_ADDR_SIZE,
321 UTF16_LITTLE_ENDIAN,
322 (__u8 *)out->body.kvp_ip_val.sub_net,
323 MAX_IP_ADDR_SIZE);
324
325 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.gate_way,
326 MAX_GATEWAY_SIZE,
327 UTF16_LITTLE_ENDIAN,
328 (__u8 *)out->body.kvp_ip_val.gate_way,
329 MAX_GATEWAY_SIZE);
330
331 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.dns_addr,
332 MAX_IP_ADDR_SIZE,
333 UTF16_LITTLE_ENDIAN,
334 (__u8 *)out->body.kvp_ip_val.dns_addr,
335 MAX_IP_ADDR_SIZE);
336
337 out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled;
338
339 default:
340 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id,
341 MAX_ADAPTER_ID_SIZE,
342 UTF16_LITTLE_ENDIAN,
343 (__u8 *)out->body.kvp_ip_val.adapter_id,
344 MAX_ADAPTER_ID_SIZE);
345
346 out->body.kvp_ip_val.addr_family = in->kvp_ip_val.addr_family;
347 }
348 }
349
350
351
352
353 static void
kvp_send_key(struct work_struct * dummy)354 kvp_send_key(struct work_struct *dummy)
355 {
356 struct hv_kvp_msg *message;
357 struct hv_kvp_msg *in_msg;
358 __u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation;
359 __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool;
360 __u32 val32;
361 __u64 val64;
362 int rc;
363
364 /* The transaction state is wrong. */
365 if (kvp_transaction.state != HVUTIL_HOSTMSG_RECEIVED)
366 return;
367
368 message = kzalloc(sizeof(*message), GFP_KERNEL);
369 if (!message)
370 return;
371
372 message->kvp_hdr.operation = operation;
373 message->kvp_hdr.pool = pool;
374 in_msg = kvp_transaction.kvp_msg;
375
376 /*
377 * The key/value strings sent from the host are encoded in
378 * in utf16; convert it to utf8 strings.
379 * The host assures us that the utf16 strings will not exceed
380 * the max lengths specified. We will however, reserve room
381 * for the string terminating character - in the utf16s_utf8s()
382 * function we limit the size of the buffer where the converted
383 * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to gaurantee
384 * that the strings can be properly terminated!
385 */
386
387 switch (message->kvp_hdr.operation) {
388 case KVP_OP_SET_IP_INFO:
389 process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO);
390 break;
391 case KVP_OP_GET_IP_INFO:
392 process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO);
393 break;
394 case KVP_OP_SET:
395 switch (in_msg->body.kvp_set.data.value_type) {
396 case REG_SZ:
397 /*
398 * The value is a string - utf16 encoding.
399 */
400 message->body.kvp_set.data.value_size =
401 utf16s_to_utf8s(
402 (wchar_t *)in_msg->body.kvp_set.data.value,
403 in_msg->body.kvp_set.data.value_size,
404 UTF16_LITTLE_ENDIAN,
405 message->body.kvp_set.data.value,
406 HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1;
407 break;
408
409 case REG_U32:
410 /*
411 * The value is a 32 bit scalar.
412 * We save this as a utf8 string.
413 */
414 val32 = in_msg->body.kvp_set.data.value_u32;
415 message->body.kvp_set.data.value_size =
416 sprintf(message->body.kvp_set.data.value,
417 "%d", val32) + 1;
418 break;
419
420 case REG_U64:
421 /*
422 * The value is a 64 bit scalar.
423 * We save this as a utf8 string.
424 */
425 val64 = in_msg->body.kvp_set.data.value_u64;
426 message->body.kvp_set.data.value_size =
427 sprintf(message->body.kvp_set.data.value,
428 "%llu", val64) + 1;
429 break;
430
431 }
432 case KVP_OP_GET:
433 message->body.kvp_set.data.key_size =
434 utf16s_to_utf8s(
435 (wchar_t *)in_msg->body.kvp_set.data.key,
436 in_msg->body.kvp_set.data.key_size,
437 UTF16_LITTLE_ENDIAN,
438 message->body.kvp_set.data.key,
439 HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
440 break;
441
442 case KVP_OP_DELETE:
443 message->body.kvp_delete.key_size =
444 utf16s_to_utf8s(
445 (wchar_t *)in_msg->body.kvp_delete.key,
446 in_msg->body.kvp_delete.key_size,
447 UTF16_LITTLE_ENDIAN,
448 message->body.kvp_delete.key,
449 HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
450 break;
451
452 case KVP_OP_ENUMERATE:
453 message->body.kvp_enum_data.index =
454 in_msg->body.kvp_enum_data.index;
455 break;
456 }
457
458 kvp_transaction.state = HVUTIL_USERSPACE_REQ;
459 rc = hvutil_transport_send(hvt, message, sizeof(*message));
460 if (rc) {
461 pr_debug("KVP: failed to communicate to the daemon: %d\n", rc);
462 if (cancel_delayed_work_sync(&kvp_timeout_work)) {
463 kvp_respond_to_host(message, HV_E_FAIL);
464 kvp_transaction.state = HVUTIL_READY;
465 }
466 }
467
468 kfree(message);
469
470 return;
471 }
472
473 /*
474 * Send a response back to the host.
475 */
476
477 static void
kvp_respond_to_host(struct hv_kvp_msg * msg_to_host,int error)478 kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error)
479 {
480 struct hv_kvp_msg *kvp_msg;
481 struct hv_kvp_exchg_msg_value *kvp_data;
482 char *key_name;
483 char *value;
484 struct icmsg_hdr *icmsghdrp;
485 int keylen = 0;
486 int valuelen = 0;
487 u32 buf_len;
488 struct vmbus_channel *channel;
489 u64 req_id;
490 int ret;
491
492 /*
493 * Copy the global state for completing the transaction. Note that
494 * only one transaction can be active at a time.
495 */
496
497 buf_len = kvp_transaction.recv_len;
498 channel = kvp_transaction.recv_channel;
499 req_id = kvp_transaction.recv_req_id;
500
501 icmsghdrp = (struct icmsg_hdr *)
502 &recv_buffer[sizeof(struct vmbuspipe_hdr)];
503
504 if (channel->onchannel_callback == NULL)
505 /*
506 * We have raced with util driver being unloaded;
507 * silently return.
508 */
509 return;
510
511 icmsghdrp->status = error;
512
513 /*
514 * If the error parameter is set, terminate the host's enumeration
515 * on this pool.
516 */
517 if (error) {
518 /*
519 * Something failed or we have timedout;
520 * terminate the current host-side iteration.
521 */
522 goto response_done;
523 }
524
525 kvp_msg = (struct hv_kvp_msg *)
526 &recv_buffer[sizeof(struct vmbuspipe_hdr) +
527 sizeof(struct icmsg_hdr)];
528
529 switch (kvp_transaction.kvp_msg->kvp_hdr.operation) {
530 case KVP_OP_GET_IP_INFO:
531 ret = process_ob_ipinfo(msg_to_host,
532 (struct hv_kvp_ip_msg *)kvp_msg,
533 KVP_OP_GET_IP_INFO);
534 if (ret < 0)
535 icmsghdrp->status = HV_E_FAIL;
536
537 goto response_done;
538 case KVP_OP_SET_IP_INFO:
539 goto response_done;
540 case KVP_OP_GET:
541 kvp_data = &kvp_msg->body.kvp_get.data;
542 goto copy_value;
543
544 case KVP_OP_SET:
545 case KVP_OP_DELETE:
546 goto response_done;
547
548 default:
549 break;
550 }
551
552 kvp_data = &kvp_msg->body.kvp_enum_data.data;
553 key_name = msg_to_host->body.kvp_enum_data.data.key;
554
555 /*
556 * The windows host expects the key/value pair to be encoded
557 * in utf16. Ensure that the key/value size reported to the host
558 * will be less than or equal to the MAX size (including the
559 * terminating character).
560 */
561 keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN,
562 (wchar_t *) kvp_data->key,
563 (HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2);
564 kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */
565
566 copy_value:
567 value = msg_to_host->body.kvp_enum_data.data.value;
568 valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN,
569 (wchar_t *) kvp_data->value,
570 (HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2);
571 kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */
572
573 /*
574 * If the utf8s to utf16s conversion failed; notify host
575 * of the error.
576 */
577 if ((keylen < 0) || (valuelen < 0))
578 icmsghdrp->status = HV_E_FAIL;
579
580 kvp_data->value_type = REG_SZ; /* all our values are strings */
581
582 response_done:
583 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE;
584
585 vmbus_sendpacket(channel, recv_buffer, buf_len, req_id,
586 VM_PKT_DATA_INBAND, 0);
587 }
588
589 /*
590 * This callback is invoked when we get a KVP message from the host.
591 * The host ensures that only one KVP transaction can be active at a time.
592 * KVP implementation in Linux needs to forward the key to a user-mde
593 * component to retrive the corresponding value. Consequently, we cannot
594 * respond to the host in the conext of this callback. Since the host
595 * guarantees that at most only one transaction can be active at a time,
596 * we stash away the transaction state in a set of global variables.
597 */
598
hv_kvp_onchannelcallback(void * context)599 void hv_kvp_onchannelcallback(void *context)
600 {
601 struct vmbus_channel *channel = context;
602 u32 recvlen;
603 u64 requestid;
604
605 struct hv_kvp_msg *kvp_msg;
606
607 struct icmsg_hdr *icmsghdrp;
608 struct icmsg_negotiate *negop = NULL;
609 int util_fw_version;
610 int kvp_srv_version;
611 static enum {NEGO_NOT_STARTED,
612 NEGO_IN_PROGRESS,
613 NEGO_FINISHED} host_negotiatied = NEGO_NOT_STARTED;
614
615 if (kvp_transaction.state < HVUTIL_READY) {
616 /*
617 * If userspace daemon is not connected and host is asking
618 * us to negotiate we need to delay to not lose messages.
619 * This is important for Failover IP setting.
620 */
621 if (host_negotiatied == NEGO_NOT_STARTED) {
622 host_negotiatied = NEGO_IN_PROGRESS;
623 schedule_delayed_work(&kvp_host_handshake_work,
624 HV_UTIL_NEGO_TIMEOUT * HZ);
625 }
626 return;
627 }
628 if (kvp_transaction.state > HVUTIL_READY)
629 return;
630 recheck:
631 vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen,
632 &requestid);
633
634 if (recvlen > 0) {
635 icmsghdrp = (struct icmsg_hdr *)&recv_buffer[
636 sizeof(struct vmbuspipe_hdr)];
637
638 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
639 /*
640 * Based on the host, select appropriate
641 * framework and service versions we will
642 * negotiate.
643 */
644 switch (vmbus_proto_version) {
645 case (VERSION_WS2008):
646 util_fw_version = UTIL_WS2K8_FW_VERSION;
647 kvp_srv_version = WS2008_SRV_VERSION;
648 break;
649 case (VERSION_WIN7):
650 util_fw_version = UTIL_FW_VERSION;
651 kvp_srv_version = WIN7_SRV_VERSION;
652 break;
653 default:
654 util_fw_version = UTIL_FW_VERSION;
655 kvp_srv_version = WIN8_SRV_VERSION;
656 }
657 vmbus_prep_negotiate_resp(icmsghdrp, negop,
658 recv_buffer, util_fw_version,
659 kvp_srv_version);
660
661 } else {
662 kvp_msg = (struct hv_kvp_msg *)&recv_buffer[
663 sizeof(struct vmbuspipe_hdr) +
664 sizeof(struct icmsg_hdr)];
665
666 /*
667 * Stash away this global state for completing the
668 * transaction; note transactions are serialized.
669 */
670
671 kvp_transaction.recv_len = recvlen;
672 kvp_transaction.recv_req_id = requestid;
673 kvp_transaction.kvp_msg = kvp_msg;
674
675 if (kvp_transaction.state < HVUTIL_READY) {
676 /* Userspace is not registered yet */
677 kvp_respond_to_host(NULL, HV_E_FAIL);
678 return;
679 }
680 kvp_transaction.state = HVUTIL_HOSTMSG_RECEIVED;
681
682 /*
683 * Get the information from the
684 * user-mode component.
685 * component. This transaction will be
686 * completed when we get the value from
687 * the user-mode component.
688 * Set a timeout to deal with
689 * user-mode not responding.
690 */
691 schedule_work(&kvp_sendkey_work);
692 schedule_delayed_work(&kvp_timeout_work,
693 HV_UTIL_TIMEOUT * HZ);
694
695 return;
696
697 }
698
699 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
700 | ICMSGHDRFLAG_RESPONSE;
701
702 vmbus_sendpacket(channel, recv_buffer,
703 recvlen, requestid,
704 VM_PKT_DATA_INBAND, 0);
705
706 host_negotiatied = NEGO_FINISHED;
707
708 goto recheck;
709 }
710
711 }
712
kvp_on_reset(void)713 static void kvp_on_reset(void)
714 {
715 if (cancel_delayed_work_sync(&kvp_timeout_work))
716 kvp_respond_to_host(NULL, HV_E_FAIL);
717 kvp_transaction.state = HVUTIL_DEVICE_INIT;
718 complete(&release_event);
719 }
720
721 int
hv_kvp_init(struct hv_util_service * srv)722 hv_kvp_init(struct hv_util_service *srv)
723 {
724 recv_buffer = srv->recv_buffer;
725 kvp_transaction.recv_channel = srv->channel;
726
727 init_completion(&release_event);
728 /*
729 * When this driver loads, the user level daemon that
730 * processes the host requests may not yet be running.
731 * Defer processing channel callbacks until the daemon
732 * has registered.
733 */
734 kvp_transaction.state = HVUTIL_DEVICE_INIT;
735
736 hvt = hvutil_transport_init(kvp_devname, CN_KVP_IDX, CN_KVP_VAL,
737 kvp_on_msg, kvp_on_reset);
738 if (!hvt)
739 return -EFAULT;
740
741 return 0;
742 }
743
hv_kvp_deinit(void)744 void hv_kvp_deinit(void)
745 {
746 kvp_transaction.state = HVUTIL_DEVICE_DYING;
747 cancel_delayed_work_sync(&kvp_host_handshake_work);
748 cancel_delayed_work_sync(&kvp_timeout_work);
749 cancel_work_sync(&kvp_sendkey_work);
750 hvutil_transport_destroy(hvt);
751 wait_for_completion(&release_event);
752 }
753