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16#include <linux/vmw_vmci_defs.h>
17#include <linux/vmw_vmci_api.h>
18#include <linux/miscdevice.h>
19#include <linux/interrupt.h>
20#include <linux/highmem.h>
21#include <linux/atomic.h>
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/mutex.h>
25#include <linux/sched.h>
26#include <linux/cred.h>
27#include <linux/slab.h>
28#include <linux/file.h>
29#include <linux/init.h>
30#include <linux/poll.h>
31#include <linux/pci.h>
32#include <linux/smp.h>
33#include <linux/fs.h>
34#include <linux/io.h>
35
36#include "vmci_handle_array.h"
37#include "vmci_queue_pair.h"
38#include "vmci_datagram.h"
39#include "vmci_doorbell.h"
40#include "vmci_resource.h"
41#include "vmci_context.h"
42#include "vmci_driver.h"
43#include "vmci_event.h"
44
45#define VMCI_UTIL_NUM_RESOURCES 1
46
47enum {
48 VMCI_NOTIFY_RESOURCE_QUEUE_PAIR = 0,
49 VMCI_NOTIFY_RESOURCE_DOOR_BELL = 1,
50};
51
52enum {
53 VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY = 0,
54 VMCI_NOTIFY_RESOURCE_ACTION_CREATE = 1,
55 VMCI_NOTIFY_RESOURCE_ACTION_DESTROY = 2,
56};
57
58
59
60
61
62struct vmci_init_blk {
63 u32 cid;
64 u32 flags;
65};
66
67
68struct vmci_qp_alloc_info_vmvm {
69 struct vmci_handle handle;
70 u32 peer;
71 u32 flags;
72 u64 produce_size;
73 u64 consume_size;
74 u64 produce_page_file;
75 u64 consume_page_file;
76 u64 produce_page_file_size;
77 u64 consume_page_file_size;
78 s32 result;
79 u32 _pad;
80};
81
82
83struct vmci_set_notify_info {
84 u64 notify_uva;
85 s32 result;
86 u32 _pad;
87};
88
89
90
91
92struct vmci_host_dev {
93 struct vmci_ctx *context;
94 int user_version;
95 enum vmci_obj_type ct_type;
96 struct mutex lock;
97};
98
99static struct vmci_ctx *host_context;
100static bool vmci_host_device_initialized;
101static atomic_t vmci_host_active_users = ATOMIC_INIT(0);
102
103
104
105
106
107
108
109
110
111
112bool vmci_host_code_active(void)
113{
114 return vmci_host_device_initialized &&
115 (!vmci_guest_code_active() ||
116 atomic_read(&vmci_host_active_users) > 0);
117}
118
119
120
121
122static int vmci_host_open(struct inode *inode, struct file *filp)
123{
124 struct vmci_host_dev *vmci_host_dev;
125
126 vmci_host_dev = kzalloc(sizeof(struct vmci_host_dev), GFP_KERNEL);
127 if (vmci_host_dev == NULL)
128 return -ENOMEM;
129
130 vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
131 mutex_init(&vmci_host_dev->lock);
132 filp->private_data = vmci_host_dev;
133
134 return 0;
135}
136
137
138
139
140
141static int vmci_host_close(struct inode *inode, struct file *filp)
142{
143 struct vmci_host_dev *vmci_host_dev = filp->private_data;
144
145 if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
146 vmci_ctx_destroy(vmci_host_dev->context);
147 vmci_host_dev->context = NULL;
148
149
150
151
152
153
154
155 atomic_dec(&vmci_host_active_users);
156 }
157 vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
158
159 kfree(vmci_host_dev);
160 filp->private_data = NULL;
161 return 0;
162}
163
164
165
166
167
168static __poll_t vmci_host_poll(struct file *filp, poll_table *wait)
169{
170 struct vmci_host_dev *vmci_host_dev = filp->private_data;
171 struct vmci_ctx *context = vmci_host_dev->context;
172 __poll_t mask = 0;
173
174 if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
175
176 if (wait)
177 poll_wait(filp, &context->host_context.wait_queue,
178 wait);
179
180 spin_lock(&context->lock);
181 if (context->pending_datagrams > 0 ||
182 vmci_handle_arr_get_size(
183 context->pending_doorbell_array) > 0) {
184 mask = EPOLLIN;
185 }
186 spin_unlock(&context->lock);
187 }
188 return mask;
189}
190
191
192
193
194
195
196
197static int drv_cp_harray_to_user(void __user *user_buf_uva,
198 u64 *user_buf_size,
199 struct vmci_handle_arr *handle_array,
200 int *retval)
201{
202 u32 array_size = 0;
203 struct vmci_handle *handles;
204
205 if (handle_array)
206 array_size = vmci_handle_arr_get_size(handle_array);
207
208 if (array_size * sizeof(*handles) > *user_buf_size)
209 return VMCI_ERROR_MORE_DATA;
210
211 *user_buf_size = array_size * sizeof(*handles);
212 if (*user_buf_size)
213 *retval = copy_to_user(user_buf_uva,
214 vmci_handle_arr_get_handles
215 (handle_array), *user_buf_size);
216
217 return VMCI_SUCCESS;
218}
219
220
221
222
223
224static int vmci_host_setup_notify(struct vmci_ctx *context,
225 unsigned long uva)
226{
227 int retval;
228
229 if (context->notify_page) {
230 pr_devel("%s: Notify mechanism is already set up\n", __func__);
231 return VMCI_ERROR_DUPLICATE_ENTRY;
232 }
233
234
235
236
237
238 BUILD_BUG_ON(sizeof(bool) != sizeof(u8));
239 if (!access_ok(VERIFY_WRITE, (void __user *)uva, sizeof(u8)))
240 return VMCI_ERROR_GENERIC;
241
242
243
244
245 retval = get_user_pages_fast(uva, 1, 1, &context->notify_page);
246 if (retval != 1) {
247 context->notify_page = NULL;
248 return VMCI_ERROR_GENERIC;
249 }
250
251
252
253
254 context->notify = kmap(context->notify_page) + (uva & (PAGE_SIZE - 1));
255 vmci_ctx_check_signal_notify(context);
256
257 return VMCI_SUCCESS;
258}
259
260static int vmci_host_get_version(struct vmci_host_dev *vmci_host_dev,
261 unsigned int cmd, void __user *uptr)
262{
263 if (cmd == IOCTL_VMCI_VERSION2) {
264 int __user *vptr = uptr;
265 if (get_user(vmci_host_dev->user_version, vptr))
266 return -EFAULT;
267 }
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283 if (vmci_host_dev->user_version > 0 &&
284 vmci_host_dev->user_version < VMCI_VERSION_HOSTQP) {
285 return vmci_host_dev->user_version;
286 }
287
288 return VMCI_VERSION;
289}
290
291#define vmci_ioctl_err(fmt, ...) \
292 pr_devel("%s: " fmt, ioctl_name, ##__VA_ARGS__)
293
294static int vmci_host_do_init_context(struct vmci_host_dev *vmci_host_dev,
295 const char *ioctl_name,
296 void __user *uptr)
297{
298 struct vmci_init_blk init_block;
299 const struct cred *cred;
300 int retval;
301
302 if (copy_from_user(&init_block, uptr, sizeof(init_block))) {
303 vmci_ioctl_err("error reading init block\n");
304 return -EFAULT;
305 }
306
307 mutex_lock(&vmci_host_dev->lock);
308
309 if (vmci_host_dev->ct_type != VMCIOBJ_NOT_SET) {
310 vmci_ioctl_err("received VMCI init on initialized handle\n");
311 retval = -EINVAL;
312 goto out;
313 }
314
315 if (init_block.flags & ~VMCI_PRIVILEGE_FLAG_RESTRICTED) {
316 vmci_ioctl_err("unsupported VMCI restriction flag\n");
317 retval = -EINVAL;
318 goto out;
319 }
320
321 cred = get_current_cred();
322 vmci_host_dev->context = vmci_ctx_create(init_block.cid,
323 init_block.flags, 0,
324 vmci_host_dev->user_version,
325 cred);
326 put_cred(cred);
327 if (IS_ERR(vmci_host_dev->context)) {
328 retval = PTR_ERR(vmci_host_dev->context);
329 vmci_ioctl_err("error initializing context\n");
330 goto out;
331 }
332
333
334
335
336
337 init_block.cid = vmci_ctx_get_id(vmci_host_dev->context);
338 if (copy_to_user(uptr, &init_block, sizeof(init_block))) {
339 vmci_ctx_destroy(vmci_host_dev->context);
340 vmci_host_dev->context = NULL;
341 vmci_ioctl_err("error writing init block\n");
342 retval = -EFAULT;
343 goto out;
344 }
345
346 vmci_host_dev->ct_type = VMCIOBJ_CONTEXT;
347 atomic_inc(&vmci_host_active_users);
348
349 retval = 0;
350
351out:
352 mutex_unlock(&vmci_host_dev->lock);
353 return retval;
354}
355
356static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev,
357 const char *ioctl_name,
358 void __user *uptr)
359{
360 struct vmci_datagram_snd_rcv_info send_info;
361 struct vmci_datagram *dg = NULL;
362 u32 cid;
363
364 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
365 vmci_ioctl_err("only valid for contexts\n");
366 return -EINVAL;
367 }
368
369 if (copy_from_user(&send_info, uptr, sizeof(send_info)))
370 return -EFAULT;
371
372 if (send_info.len > VMCI_MAX_DG_SIZE) {
373 vmci_ioctl_err("datagram is too big (size=%d)\n",
374 send_info.len);
375 return -EINVAL;
376 }
377
378 if (send_info.len < sizeof(*dg)) {
379 vmci_ioctl_err("datagram is too small (size=%d)\n",
380 send_info.len);
381 return -EINVAL;
382 }
383
384 dg = memdup_user((void __user *)(uintptr_t)send_info.addr,
385 send_info.len);
386 if (IS_ERR(dg)) {
387 vmci_ioctl_err(
388 "cannot allocate memory to dispatch datagram\n");
389 return PTR_ERR(dg);
390 }
391
392 if (VMCI_DG_SIZE(dg) != send_info.len) {
393 vmci_ioctl_err("datagram size mismatch\n");
394 kfree(dg);
395 return -EINVAL;
396 }
397
398 pr_devel("Datagram dst (handle=0x%x:0x%x) src (handle=0x%x:0x%x), payload (size=%llu bytes)\n",
399 dg->dst.context, dg->dst.resource,
400 dg->src.context, dg->src.resource,
401 (unsigned long long)dg->payload_size);
402
403
404 cid = vmci_ctx_get_id(vmci_host_dev->context);
405 send_info.result = vmci_datagram_dispatch(cid, dg, true);
406 kfree(dg);
407
408 return copy_to_user(uptr, &send_info, sizeof(send_info)) ? -EFAULT : 0;
409}
410
411static int vmci_host_do_receive_datagram(struct vmci_host_dev *vmci_host_dev,
412 const char *ioctl_name,
413 void __user *uptr)
414{
415 struct vmci_datagram_snd_rcv_info recv_info;
416 struct vmci_datagram *dg = NULL;
417 int retval;
418 size_t size;
419
420 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
421 vmci_ioctl_err("only valid for contexts\n");
422 return -EINVAL;
423 }
424
425 if (copy_from_user(&recv_info, uptr, sizeof(recv_info)))
426 return -EFAULT;
427
428 size = recv_info.len;
429 recv_info.result = vmci_ctx_dequeue_datagram(vmci_host_dev->context,
430 &size, &dg);
431
432 if (recv_info.result >= VMCI_SUCCESS) {
433 void __user *ubuf = (void __user *)(uintptr_t)recv_info.addr;
434 retval = copy_to_user(ubuf, dg, VMCI_DG_SIZE(dg));
435 kfree(dg);
436 if (retval != 0)
437 return -EFAULT;
438 }
439
440 return copy_to_user(uptr, &recv_info, sizeof(recv_info)) ? -EFAULT : 0;
441}
442
443static int vmci_host_do_alloc_queuepair(struct vmci_host_dev *vmci_host_dev,
444 const char *ioctl_name,
445 void __user *uptr)
446{
447 struct vmci_handle handle;
448 int vmci_status;
449 int __user *retptr;
450
451 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
452 vmci_ioctl_err("only valid for contexts\n");
453 return -EINVAL;
454 }
455
456 if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
457 struct vmci_qp_alloc_info_vmvm alloc_info;
458 struct vmci_qp_alloc_info_vmvm __user *info = uptr;
459
460 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
461 return -EFAULT;
462
463 handle = alloc_info.handle;
464 retptr = &info->result;
465
466 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
467 alloc_info.peer,
468 alloc_info.flags,
469 VMCI_NO_PRIVILEGE_FLAGS,
470 alloc_info.produce_size,
471 alloc_info.consume_size,
472 NULL,
473 vmci_host_dev->context);
474
475 if (vmci_status == VMCI_SUCCESS)
476 vmci_status = VMCI_SUCCESS_QUEUEPAIR_CREATE;
477 } else {
478 struct vmci_qp_alloc_info alloc_info;
479 struct vmci_qp_alloc_info __user *info = uptr;
480 struct vmci_qp_page_store page_store;
481
482 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
483 return -EFAULT;
484
485 handle = alloc_info.handle;
486 retptr = &info->result;
487
488 page_store.pages = alloc_info.ppn_va;
489 page_store.len = alloc_info.num_ppns;
490
491 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
492 alloc_info.peer,
493 alloc_info.flags,
494 VMCI_NO_PRIVILEGE_FLAGS,
495 alloc_info.produce_size,
496 alloc_info.consume_size,
497 &page_store,
498 vmci_host_dev->context);
499 }
500
501 if (put_user(vmci_status, retptr)) {
502 if (vmci_status >= VMCI_SUCCESS) {
503 vmci_status = vmci_qp_broker_detach(handle,
504 vmci_host_dev->context);
505 }
506 return -EFAULT;
507 }
508
509 return 0;
510}
511
512static int vmci_host_do_queuepair_setva(struct vmci_host_dev *vmci_host_dev,
513 const char *ioctl_name,
514 void __user *uptr)
515{
516 struct vmci_qp_set_va_info set_va_info;
517 struct vmci_qp_set_va_info __user *info = uptr;
518 s32 result;
519
520 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
521 vmci_ioctl_err("only valid for contexts\n");
522 return -EINVAL;
523 }
524
525 if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
526 vmci_ioctl_err("is not allowed\n");
527 return -EINVAL;
528 }
529
530 if (copy_from_user(&set_va_info, uptr, sizeof(set_va_info)))
531 return -EFAULT;
532
533 if (set_va_info.va) {
534
535
536
537
538 result = vmci_qp_broker_map(set_va_info.handle,
539 vmci_host_dev->context,
540 set_va_info.va);
541 } else {
542
543
544
545
546 result = vmci_qp_broker_unmap(set_va_info.handle,
547 vmci_host_dev->context, 0);
548 }
549
550 return put_user(result, &info->result) ? -EFAULT : 0;
551}
552
553static int vmci_host_do_queuepair_setpf(struct vmci_host_dev *vmci_host_dev,
554 const char *ioctl_name,
555 void __user *uptr)
556{
557 struct vmci_qp_page_file_info page_file_info;
558 struct vmci_qp_page_file_info __user *info = uptr;
559 s32 result;
560
561 if (vmci_host_dev->user_version < VMCI_VERSION_HOSTQP ||
562 vmci_host_dev->user_version >= VMCI_VERSION_NOVMVM) {
563 vmci_ioctl_err("not supported on this VMX (version=%d)\n",
564 vmci_host_dev->user_version);
565 return -EINVAL;
566 }
567
568 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
569 vmci_ioctl_err("only valid for contexts\n");
570 return -EINVAL;
571 }
572
573 if (copy_from_user(&page_file_info, uptr, sizeof(*info)))
574 return -EFAULT;
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592 if (put_user(VMCI_SUCCESS, &info->result)) {
593
594
595
596
597
598 return -EFAULT;
599 }
600
601 result = vmci_qp_broker_set_page_store(page_file_info.handle,
602 page_file_info.produce_va,
603 page_file_info.consume_va,
604 vmci_host_dev->context);
605 if (result < VMCI_SUCCESS) {
606 if (put_user(result, &info->result)) {
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624 return -EFAULT;
625 }
626 }
627
628 return 0;
629}
630
631static int vmci_host_do_qp_detach(struct vmci_host_dev *vmci_host_dev,
632 const char *ioctl_name,
633 void __user *uptr)
634{
635 struct vmci_qp_dtch_info detach_info;
636 struct vmci_qp_dtch_info __user *info = uptr;
637 s32 result;
638
639 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
640 vmci_ioctl_err("only valid for contexts\n");
641 return -EINVAL;
642 }
643
644 if (copy_from_user(&detach_info, uptr, sizeof(detach_info)))
645 return -EFAULT;
646
647 result = vmci_qp_broker_detach(detach_info.handle,
648 vmci_host_dev->context);
649 if (result == VMCI_SUCCESS &&
650 vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
651 result = VMCI_SUCCESS_LAST_DETACH;
652 }
653
654 return put_user(result, &info->result) ? -EFAULT : 0;
655}
656
657static int vmci_host_do_ctx_add_notify(struct vmci_host_dev *vmci_host_dev,
658 const char *ioctl_name,
659 void __user *uptr)
660{
661 struct vmci_ctx_info ar_info;
662 struct vmci_ctx_info __user *info = uptr;
663 s32 result;
664 u32 cid;
665
666 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
667 vmci_ioctl_err("only valid for contexts\n");
668 return -EINVAL;
669 }
670
671 if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
672 return -EFAULT;
673
674 cid = vmci_ctx_get_id(vmci_host_dev->context);
675 result = vmci_ctx_add_notification(cid, ar_info.remote_cid);
676
677 return put_user(result, &info->result) ? -EFAULT : 0;
678}
679
680static int vmci_host_do_ctx_remove_notify(struct vmci_host_dev *vmci_host_dev,
681 const char *ioctl_name,
682 void __user *uptr)
683{
684 struct vmci_ctx_info ar_info;
685 struct vmci_ctx_info __user *info = uptr;
686 u32 cid;
687 int result;
688
689 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
690 vmci_ioctl_err("only valid for contexts\n");
691 return -EINVAL;
692 }
693
694 if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
695 return -EFAULT;
696
697 cid = vmci_ctx_get_id(vmci_host_dev->context);
698 result = vmci_ctx_remove_notification(cid,
699 ar_info.remote_cid);
700
701 return put_user(result, &info->result) ? -EFAULT : 0;
702}
703
704static int vmci_host_do_ctx_get_cpt_state(struct vmci_host_dev *vmci_host_dev,
705 const char *ioctl_name,
706 void __user *uptr)
707{
708 struct vmci_ctx_chkpt_buf_info get_info;
709 u32 cid;
710 void *cpt_buf;
711 int retval;
712
713 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
714 vmci_ioctl_err("only valid for contexts\n");
715 return -EINVAL;
716 }
717
718 if (copy_from_user(&get_info, uptr, sizeof(get_info)))
719 return -EFAULT;
720
721 cid = vmci_ctx_get_id(vmci_host_dev->context);
722 get_info.result = vmci_ctx_get_chkpt_state(cid, get_info.cpt_type,
723 &get_info.buf_size, &cpt_buf);
724 if (get_info.result == VMCI_SUCCESS && get_info.buf_size) {
725 void __user *ubuf = (void __user *)(uintptr_t)get_info.cpt_buf;
726 retval = copy_to_user(ubuf, cpt_buf, get_info.buf_size);
727 kfree(cpt_buf);
728
729 if (retval)
730 return -EFAULT;
731 }
732
733 return copy_to_user(uptr, &get_info, sizeof(get_info)) ? -EFAULT : 0;
734}
735
736static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,
737 const char *ioctl_name,
738 void __user *uptr)
739{
740 struct vmci_ctx_chkpt_buf_info set_info;
741 u32 cid;
742 void *cpt_buf;
743 int retval;
744
745 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
746 vmci_ioctl_err("only valid for contexts\n");
747 return -EINVAL;
748 }
749
750 if (copy_from_user(&set_info, uptr, sizeof(set_info)))
751 return -EFAULT;
752
753 cpt_buf = kmalloc(set_info.buf_size, GFP_KERNEL);
754 if (!cpt_buf) {
755 vmci_ioctl_err(
756 "cannot allocate memory to set cpt state (type=%d)\n",
757 set_info.cpt_type);
758 return -ENOMEM;
759 }
760
761 if (copy_from_user(cpt_buf, (void __user *)(uintptr_t)set_info.cpt_buf,
762 set_info.buf_size)) {
763 retval = -EFAULT;
764 goto out;
765 }
766
767 cid = vmci_ctx_get_id(vmci_host_dev->context);
768 set_info.result = vmci_ctx_set_chkpt_state(cid, set_info.cpt_type,
769 set_info.buf_size, cpt_buf);
770
771 retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;
772
773out:
774 kfree(cpt_buf);
775 return retval;
776}
777
778static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev,
779 const char *ioctl_name,
780 void __user *uptr)
781{
782 u32 __user *u32ptr = uptr;
783
784 return put_user(VMCI_HOST_CONTEXT_ID, u32ptr) ? -EFAULT : 0;
785}
786
787static int vmci_host_do_set_notify(struct vmci_host_dev *vmci_host_dev,
788 const char *ioctl_name,
789 void __user *uptr)
790{
791 struct vmci_set_notify_info notify_info;
792
793 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
794 vmci_ioctl_err("only valid for contexts\n");
795 return -EINVAL;
796 }
797
798 if (copy_from_user(¬ify_info, uptr, sizeof(notify_info)))
799 return -EFAULT;
800
801 if (notify_info.notify_uva) {
802 notify_info.result =
803 vmci_host_setup_notify(vmci_host_dev->context,
804 notify_info.notify_uva);
805 } else {
806 vmci_ctx_unset_notify(vmci_host_dev->context);
807 notify_info.result = VMCI_SUCCESS;
808 }
809
810 return copy_to_user(uptr, ¬ify_info, sizeof(notify_info)) ?
811 -EFAULT : 0;
812}
813
814static int vmci_host_do_notify_resource(struct vmci_host_dev *vmci_host_dev,
815 const char *ioctl_name,
816 void __user *uptr)
817{
818 struct vmci_dbell_notify_resource_info info;
819 u32 cid;
820
821 if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
822 vmci_ioctl_err("invalid for current VMX versions\n");
823 return -EINVAL;
824 }
825
826 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
827 vmci_ioctl_err("only valid for contexts\n");
828 return -EINVAL;
829 }
830
831 if (copy_from_user(&info, uptr, sizeof(info)))
832 return -EFAULT;
833
834 cid = vmci_ctx_get_id(vmci_host_dev->context);
835
836 switch (info.action) {
837 case VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY:
838 if (info.resource == VMCI_NOTIFY_RESOURCE_DOOR_BELL) {
839 u32 flags = VMCI_NO_PRIVILEGE_FLAGS;
840 info.result = vmci_ctx_notify_dbell(cid, info.handle,
841 flags);
842 } else {
843 info.result = VMCI_ERROR_UNAVAILABLE;
844 }
845 break;
846
847 case VMCI_NOTIFY_RESOURCE_ACTION_CREATE:
848 info.result = vmci_ctx_dbell_create(cid, info.handle);
849 break;
850
851 case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY:
852 info.result = vmci_ctx_dbell_destroy(cid, info.handle);
853 break;
854
855 default:
856 vmci_ioctl_err("got unknown action (action=%d)\n",
857 info.action);
858 info.result = VMCI_ERROR_INVALID_ARGS;
859 }
860
861 return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
862}
863
864static int vmci_host_do_recv_notifications(struct vmci_host_dev *vmci_host_dev,
865 const char *ioctl_name,
866 void __user *uptr)
867{
868 struct vmci_ctx_notify_recv_info info;
869 struct vmci_handle_arr *db_handle_array;
870 struct vmci_handle_arr *qp_handle_array;
871 void __user *ubuf;
872 u32 cid;
873 int retval = 0;
874
875 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
876 vmci_ioctl_err("only valid for contexts\n");
877 return -EINVAL;
878 }
879
880 if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
881 vmci_ioctl_err("not supported for the current vmx version\n");
882 return -EINVAL;
883 }
884
885 if (copy_from_user(&info, uptr, sizeof(info)))
886 return -EFAULT;
887
888 if ((info.db_handle_buf_size && !info.db_handle_buf_uva) ||
889 (info.qp_handle_buf_size && !info.qp_handle_buf_uva)) {
890 return -EINVAL;
891 }
892
893 cid = vmci_ctx_get_id(vmci_host_dev->context);
894
895 info.result = vmci_ctx_rcv_notifications_get(cid,
896 &db_handle_array, &qp_handle_array);
897 if (info.result != VMCI_SUCCESS)
898 return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
899
900 ubuf = (void __user *)(uintptr_t)info.db_handle_buf_uva;
901 info.result = drv_cp_harray_to_user(ubuf, &info.db_handle_buf_size,
902 db_handle_array, &retval);
903 if (info.result == VMCI_SUCCESS && !retval) {
904 ubuf = (void __user *)(uintptr_t)info.qp_handle_buf_uva;
905 info.result = drv_cp_harray_to_user(ubuf,
906 &info.qp_handle_buf_size,
907 qp_handle_array, &retval);
908 }
909
910 if (!retval && copy_to_user(uptr, &info, sizeof(info)))
911 retval = -EFAULT;
912
913 vmci_ctx_rcv_notifications_release(cid,
914 db_handle_array, qp_handle_array,
915 info.result == VMCI_SUCCESS && !retval);
916
917 return retval;
918}
919
920static long vmci_host_unlocked_ioctl(struct file *filp,
921 unsigned int iocmd, unsigned long ioarg)
922{
923#define VMCI_DO_IOCTL(ioctl_name, ioctl_fn) do { \
924 char *name = __stringify(IOCTL_VMCI_ ## ioctl_name); \
925 return vmci_host_do_ ## ioctl_fn( \
926 vmci_host_dev, name, uptr); \
927 } while (0)
928
929 struct vmci_host_dev *vmci_host_dev = filp->private_data;
930 void __user *uptr = (void __user *)ioarg;
931
932 switch (iocmd) {
933 case IOCTL_VMCI_INIT_CONTEXT:
934 VMCI_DO_IOCTL(INIT_CONTEXT, init_context);
935 case IOCTL_VMCI_DATAGRAM_SEND:
936 VMCI_DO_IOCTL(DATAGRAM_SEND, send_datagram);
937 case IOCTL_VMCI_DATAGRAM_RECEIVE:
938 VMCI_DO_IOCTL(DATAGRAM_RECEIVE, receive_datagram);
939 case IOCTL_VMCI_QUEUEPAIR_ALLOC:
940 VMCI_DO_IOCTL(QUEUEPAIR_ALLOC, alloc_queuepair);
941 case IOCTL_VMCI_QUEUEPAIR_SETVA:
942 VMCI_DO_IOCTL(QUEUEPAIR_SETVA, queuepair_setva);
943 case IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE:
944 VMCI_DO_IOCTL(QUEUEPAIR_SETPAGEFILE, queuepair_setpf);
945 case IOCTL_VMCI_QUEUEPAIR_DETACH:
946 VMCI_DO_IOCTL(QUEUEPAIR_DETACH, qp_detach);
947 case IOCTL_VMCI_CTX_ADD_NOTIFICATION:
948 VMCI_DO_IOCTL(CTX_ADD_NOTIFICATION, ctx_add_notify);
949 case IOCTL_VMCI_CTX_REMOVE_NOTIFICATION:
950 VMCI_DO_IOCTL(CTX_REMOVE_NOTIFICATION, ctx_remove_notify);
951 case IOCTL_VMCI_CTX_GET_CPT_STATE:
952 VMCI_DO_IOCTL(CTX_GET_CPT_STATE, ctx_get_cpt_state);
953 case IOCTL_VMCI_CTX_SET_CPT_STATE:
954 VMCI_DO_IOCTL(CTX_SET_CPT_STATE, ctx_set_cpt_state);
955 case IOCTL_VMCI_GET_CONTEXT_ID:
956 VMCI_DO_IOCTL(GET_CONTEXT_ID, get_context_id);
957 case IOCTL_VMCI_SET_NOTIFY:
958 VMCI_DO_IOCTL(SET_NOTIFY, set_notify);
959 case IOCTL_VMCI_NOTIFY_RESOURCE:
960 VMCI_DO_IOCTL(NOTIFY_RESOURCE, notify_resource);
961 case IOCTL_VMCI_NOTIFICATIONS_RECEIVE:
962 VMCI_DO_IOCTL(NOTIFICATIONS_RECEIVE, recv_notifications);
963
964 case IOCTL_VMCI_VERSION:
965 case IOCTL_VMCI_VERSION2:
966 return vmci_host_get_version(vmci_host_dev, iocmd, uptr);
967
968 default:
969 pr_devel("%s: Unknown ioctl (iocmd=%d)\n", __func__, iocmd);
970 return -EINVAL;
971 }
972
973#undef VMCI_DO_IOCTL
974}
975
976static const struct file_operations vmuser_fops = {
977 .owner = THIS_MODULE,
978 .open = vmci_host_open,
979 .release = vmci_host_close,
980 .poll = vmci_host_poll,
981 .unlocked_ioctl = vmci_host_unlocked_ioctl,
982 .compat_ioctl = vmci_host_unlocked_ioctl,
983};
984
985static struct miscdevice vmci_host_miscdev = {
986 .name = "vmci",
987 .minor = MISC_DYNAMIC_MINOR,
988 .fops = &vmuser_fops,
989};
990
991int __init vmci_host_init(void)
992{
993 int error;
994
995 host_context = vmci_ctx_create(VMCI_HOST_CONTEXT_ID,
996 VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS,
997 -1, VMCI_VERSION, NULL);
998 if (IS_ERR(host_context)) {
999 error = PTR_ERR(host_context);
1000 pr_warn("Failed to initialize VMCIContext (error%d)\n",
1001 error);
1002 return error;
1003 }
1004
1005 error = misc_register(&vmci_host_miscdev);
1006 if (error) {
1007 pr_warn("Module registration error (name=%s, major=%d, minor=%d, err=%d)\n",
1008 vmci_host_miscdev.name,
1009 MISC_MAJOR, vmci_host_miscdev.minor,
1010 error);
1011 pr_warn("Unable to initialize host personality\n");
1012 vmci_ctx_destroy(host_context);
1013 return error;
1014 }
1015
1016 pr_info("VMCI host device registered (name=%s, major=%d, minor=%d)\n",
1017 vmci_host_miscdev.name, MISC_MAJOR, vmci_host_miscdev.minor);
1018
1019 vmci_host_device_initialized = true;
1020 return 0;
1021}
1022
1023void __exit vmci_host_exit(void)
1024{
1025 vmci_host_device_initialized = false;
1026
1027 misc_deregister(&vmci_host_miscdev);
1028 vmci_ctx_destroy(host_context);
1029 vmci_qp_broker_exit();
1030
1031 pr_debug("VMCI host driver module unloaded\n");
1032}
1033