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8bf50399 GZ |
1 | /* |
2 | * VMware VMCI Driver | |
3 | * | |
4 | * Copyright (C) 2012 VMware, Inc. All rights reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation version 2 and no later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
12 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
13 | * for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/vmw_vmci_defs.h> | |
17 | #include <linux/vmw_vmci_api.h> | |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/miscdevice.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/highmem.h> | |
22 | #include <linux/atomic.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/mutex.h> | |
26 | #include <linux/sched.h> | |
ea8a83a4 | 27 | #include <linux/slab.h> |
8bf50399 GZ |
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 | ||
47 | enum { | |
48 | VMCI_NOTIFY_RESOURCE_QUEUE_PAIR = 0, | |
49 | VMCI_NOTIFY_RESOURCE_DOOR_BELL = 1, | |
50 | }; | |
51 | ||
52 | enum { | |
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 | * VMCI driver initialization. This block can also be used to | |
60 | * pass initial group membership etc. | |
61 | */ | |
62 | struct vmci_init_blk { | |
63 | u32 cid; | |
64 | u32 flags; | |
65 | }; | |
66 | ||
67 | /* VMCIqueue_pairAllocInfo_VMToVM */ | |
68 | struct 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; /* User VA. */ | |
75 | u64 consume_page_file; /* User VA. */ | |
76 | u64 produce_page_file_size; /* Size of the file name array. */ | |
77 | u64 consume_page_file_size; /* Size of the file name array. */ | |
78 | s32 result; | |
79 | u32 _pad; | |
80 | }; | |
81 | ||
82 | /* VMCISetNotifyInfo: Used to pass notify flag's address to the host driver. */ | |
83 | struct vmci_set_notify_info { | |
84 | u64 notify_uva; | |
85 | s32 result; | |
86 | u32 _pad; | |
87 | }; | |
88 | ||
89 | /* | |
90 | * Per-instance host state | |
91 | */ | |
92 | struct vmci_host_dev { | |
93 | struct vmci_ctx *context; | |
94 | int user_version; | |
95 | enum vmci_obj_type ct_type; | |
96 | struct mutex lock; /* Mutex lock for vmci context access */ | |
97 | }; | |
98 | ||
99 | static struct vmci_ctx *host_context; | |
100 | static bool vmci_host_device_initialized; | |
101 | static atomic_t vmci_host_active_users = ATOMIC_INIT(0); | |
102 | ||
103 | /* | |
104 | * Determines whether the VMCI host personality is | |
105 | * available. Since the core functionality of the host driver is | |
106 | * always present, all guests could possibly use the host | |
107 | * personality. However, to minimize the deviation from the | |
108 | * pre-unified driver state of affairs, we only consider the host | |
109 | * device active if there is no active guest device or if there | |
110 | * are VMX'en with active VMCI contexts using the host device. | |
111 | */ | |
112 | bool 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 | * Called on open of /dev/vmci. | |
121 | */ | |
122 | static 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 | * Called on close of /dev/vmci, most often when the process | |
139 | * exits. | |
140 | */ | |
141 | static 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 | * The number of active contexts is used to track whether any | |
151 | * VMX'en are using the host personality. It is incremented when | |
152 | * a context is created through the IOCTL_VMCI_INIT_CONTEXT | |
153 | * ioctl. | |
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 | * This is used to wake up the VMX when a VMCI call arrives, or | |
166 | * to wake up select() or poll() at the next clock tick. | |
167 | */ | |
168 | static unsigned int 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 | unsigned int mask = 0; | |
173 | ||
174 | if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) { | |
175 | /* Check for VMCI calls to this VM context. */ | |
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 = POLLIN; | |
185 | } | |
186 | spin_unlock(&context->lock); | |
187 | } | |
188 | return mask; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Copies the handles of a handle array into a user buffer, and | |
193 | * returns the new length in userBufferSize. If the copy to the | |
194 | * user buffer fails, the functions still returns VMCI_SUCCESS, | |
195 | * but retval != 0. | |
196 | */ | |
197 | static 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 | * Sets up a given context for notify to work. Calls drv_map_bool_ptr() | |
222 | * which maps the notify boolean in user VA in kernel space. | |
223 | */ | |
224 | static int vmci_host_setup_notify(struct vmci_ctx *context, | |
225 | unsigned long uva) | |
226 | { | |
227 | struct page *page; | |
228 | int retval; | |
229 | ||
230 | if (context->notify_page) { | |
231 | pr_devel("%s: Notify mechanism is already set up\n", __func__); | |
232 | return VMCI_ERROR_DUPLICATE_ENTRY; | |
233 | } | |
234 | ||
235 | /* | |
236 | * We are using 'bool' internally, but let's make sure we explicit | |
237 | * about the size. | |
238 | */ | |
239 | BUILD_BUG_ON(sizeof(bool) != sizeof(u8)); | |
240 | if (!access_ok(VERIFY_WRITE, (void __user *)uva, sizeof(u8))) | |
241 | return VMCI_ERROR_GENERIC; | |
242 | ||
243 | /* | |
244 | * Lock physical page backing a given user VA. | |
245 | */ | |
240ddd49 | 246 | retval = get_user_pages_fast(PAGE_ALIGN(uva), 1, 1, &page); |
8bf50399 GZ |
247 | if (retval != 1) |
248 | return VMCI_ERROR_GENERIC; | |
249 | ||
250 | /* | |
251 | * Map the locked page and set up notify pointer. | |
252 | */ | |
253 | context->notify = kmap(page) + (uva & (PAGE_SIZE - 1)); | |
254 | vmci_ctx_check_signal_notify(context); | |
255 | ||
256 | return VMCI_SUCCESS; | |
257 | } | |
258 | ||
259 | static int vmci_host_get_version(struct vmci_host_dev *vmci_host_dev, | |
260 | unsigned int cmd, void __user *uptr) | |
261 | { | |
262 | if (cmd == IOCTL_VMCI_VERSION2) { | |
263 | int __user *vptr = uptr; | |
264 | if (get_user(vmci_host_dev->user_version, vptr)) | |
265 | return -EFAULT; | |
266 | } | |
267 | ||
268 | /* | |
269 | * The basic logic here is: | |
270 | * | |
271 | * If the user sends in a version of 0 tell it our version. | |
272 | * If the user didn't send in a version, tell it our version. | |
273 | * If the user sent in an old version, tell it -its- version. | |
274 | * If the user sent in an newer version, tell it our version. | |
275 | * | |
276 | * The rationale behind telling the caller its version is that | |
277 | * Workstation 6.5 required that VMX and VMCI kernel module were | |
278 | * version sync'd. All new VMX users will be programmed to | |
279 | * handle the VMCI kernel module version. | |
280 | */ | |
281 | ||
282 | if (vmci_host_dev->user_version > 0 && | |
283 | vmci_host_dev->user_version < VMCI_VERSION_HOSTQP) { | |
284 | return vmci_host_dev->user_version; | |
285 | } | |
286 | ||
287 | return VMCI_VERSION; | |
288 | } | |
289 | ||
290 | #define vmci_ioctl_err(fmt, ...) \ | |
291 | pr_devel("%s: " fmt, ioctl_name, ##__VA_ARGS__) | |
292 | ||
293 | static int vmci_host_do_init_context(struct vmci_host_dev *vmci_host_dev, | |
294 | const char *ioctl_name, | |
295 | void __user *uptr) | |
296 | { | |
297 | struct vmci_init_blk init_block; | |
298 | const struct cred *cred; | |
299 | int retval; | |
300 | ||
301 | if (copy_from_user(&init_block, uptr, sizeof(init_block))) { | |
302 | vmci_ioctl_err("error reading init block\n"); | |
303 | return -EFAULT; | |
304 | } | |
305 | ||
306 | mutex_lock(&vmci_host_dev->lock); | |
307 | ||
308 | if (vmci_host_dev->ct_type != VMCIOBJ_NOT_SET) { | |
309 | vmci_ioctl_err("received VMCI init on initialized handle\n"); | |
310 | retval = -EINVAL; | |
311 | goto out; | |
312 | } | |
313 | ||
314 | if (init_block.flags & ~VMCI_PRIVILEGE_FLAG_RESTRICTED) { | |
315 | vmci_ioctl_err("unsupported VMCI restriction flag\n"); | |
316 | retval = -EINVAL; | |
317 | goto out; | |
318 | } | |
319 | ||
320 | cred = get_current_cred(); | |
321 | vmci_host_dev->context = vmci_ctx_create(init_block.cid, | |
322 | init_block.flags, 0, | |
323 | vmci_host_dev->user_version, | |
324 | cred); | |
325 | put_cred(cred); | |
326 | if (IS_ERR(vmci_host_dev->context)) { | |
327 | retval = PTR_ERR(vmci_host_dev->context); | |
328 | vmci_ioctl_err("error initializing context\n"); | |
329 | goto out; | |
330 | } | |
331 | ||
332 | /* | |
333 | * Copy cid to userlevel, we do this to allow the VMX | |
334 | * to enforce its policy on cid generation. | |
335 | */ | |
336 | init_block.cid = vmci_ctx_get_id(vmci_host_dev->context); | |
337 | if (copy_to_user(uptr, &init_block, sizeof(init_block))) { | |
338 | vmci_ctx_destroy(vmci_host_dev->context); | |
339 | vmci_host_dev->context = NULL; | |
340 | vmci_ioctl_err("error writing init block\n"); | |
341 | retval = -EFAULT; | |
342 | goto out; | |
343 | } | |
344 | ||
345 | vmci_host_dev->ct_type = VMCIOBJ_CONTEXT; | |
346 | atomic_inc(&vmci_host_active_users); | |
347 | ||
348 | retval = 0; | |
349 | ||
350 | out: | |
351 | mutex_unlock(&vmci_host_dev->lock); | |
352 | return retval; | |
353 | } | |
354 | ||
355 | static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev, | |
356 | const char *ioctl_name, | |
357 | void __user *uptr) | |
358 | { | |
359 | struct vmci_datagram_snd_rcv_info send_info; | |
360 | struct vmci_datagram *dg = NULL; | |
361 | u32 cid; | |
362 | ||
363 | if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { | |
364 | vmci_ioctl_err("only valid for contexts\n"); | |
365 | return -EINVAL; | |
366 | } | |
367 | ||
368 | if (copy_from_user(&send_info, uptr, sizeof(send_info))) | |
369 | return -EFAULT; | |
370 | ||
371 | if (send_info.len > VMCI_MAX_DG_SIZE) { | |
372 | vmci_ioctl_err("datagram is too big (size=%d)\n", | |
373 | send_info.len); | |
374 | return -EINVAL; | |
375 | } | |
376 | ||
377 | if (send_info.len < sizeof(*dg)) { | |
378 | vmci_ioctl_err("datagram is too small (size=%d)\n", | |
379 | send_info.len); | |
380 | return -EINVAL; | |
381 | } | |
382 | ||
383 | dg = kmalloc(send_info.len, GFP_KERNEL); | |
384 | if (!dg) { | |
385 | vmci_ioctl_err( | |
386 | "cannot allocate memory to dispatch datagram\n"); | |
387 | return -ENOMEM; | |
388 | } | |
389 | ||
390 | if (copy_from_user(dg, (void __user *)(uintptr_t)send_info.addr, | |
391 | send_info.len)) { | |
392 | vmci_ioctl_err("error getting datagram\n"); | |
393 | kfree(dg); | |
394 | return -EFAULT; | |
395 | } | |
396 | ||
397 | pr_devel("Datagram dst (handle=0x%x:0x%x) src (handle=0x%x:0x%x), payload (size=%llu bytes)\n", | |
398 | dg->dst.context, dg->dst.resource, | |
399 | dg->src.context, dg->src.resource, | |
400 | (unsigned long long)dg->payload_size); | |
401 | ||
402 | /* Get source context id. */ | |
403 | cid = vmci_ctx_get_id(vmci_host_dev->context); | |
404 | send_info.result = vmci_datagram_dispatch(cid, dg, true); | |
405 | kfree(dg); | |
406 | ||
407 | return copy_to_user(uptr, &send_info, sizeof(send_info)) ? -EFAULT : 0; | |
408 | } | |
409 | ||
410 | static int vmci_host_do_receive_datagram(struct vmci_host_dev *vmci_host_dev, | |
411 | const char *ioctl_name, | |
412 | void __user *uptr) | |
413 | { | |
414 | struct vmci_datagram_snd_rcv_info recv_info; | |
415 | struct vmci_datagram *dg = NULL; | |
416 | int retval; | |
417 | size_t size; | |
418 | ||
419 | if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { | |
420 | vmci_ioctl_err("only valid for contexts\n"); | |
421 | return -EINVAL; | |
422 | } | |
423 | ||
424 | if (copy_from_user(&recv_info, uptr, sizeof(recv_info))) | |
425 | return -EFAULT; | |
426 | ||
427 | size = recv_info.len; | |
428 | recv_info.result = vmci_ctx_dequeue_datagram(vmci_host_dev->context, | |
429 | &size, &dg); | |
430 | ||
431 | if (recv_info.result >= VMCI_SUCCESS) { | |
432 | void __user *ubuf = (void __user *)(uintptr_t)recv_info.addr; | |
433 | retval = copy_to_user(ubuf, dg, VMCI_DG_SIZE(dg)); | |
434 | kfree(dg); | |
435 | if (retval != 0) | |
436 | return -EFAULT; | |
437 | } | |
438 | ||
439 | return copy_to_user(uptr, &recv_info, sizeof(recv_info)) ? -EFAULT : 0; | |
440 | } | |
441 | ||
442 | static int vmci_host_do_alloc_queuepair(struct vmci_host_dev *vmci_host_dev, | |
443 | const char *ioctl_name, | |
444 | void __user *uptr) | |
445 | { | |
446 | struct vmci_handle handle; | |
447 | int vmci_status; | |
448 | int __user *retptr; | |
449 | u32 cid; | |
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 | cid = vmci_ctx_get_id(vmci_host_dev->context); | |
457 | ||
458 | if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) { | |
459 | struct vmci_qp_alloc_info_vmvm alloc_info; | |
460 | struct vmci_qp_alloc_info_vmvm __user *info = uptr; | |
461 | ||
462 | if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info))) | |
463 | return -EFAULT; | |
464 | ||
465 | handle = alloc_info.handle; | |
466 | retptr = &info->result; | |
467 | ||
468 | vmci_status = vmci_qp_broker_alloc(alloc_info.handle, | |
469 | alloc_info.peer, | |
470 | alloc_info.flags, | |
471 | VMCI_NO_PRIVILEGE_FLAGS, | |
472 | alloc_info.produce_size, | |
473 | alloc_info.consume_size, | |
474 | NULL, | |
475 | vmci_host_dev->context); | |
476 | ||
477 | if (vmci_status == VMCI_SUCCESS) | |
478 | vmci_status = VMCI_SUCCESS_QUEUEPAIR_CREATE; | |
479 | } else { | |
480 | struct vmci_qp_alloc_info alloc_info; | |
481 | struct vmci_qp_alloc_info __user *info = uptr; | |
482 | struct vmci_qp_page_store page_store; | |
483 | ||
484 | if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info))) | |
485 | return -EFAULT; | |
486 | ||
487 | handle = alloc_info.handle; | |
488 | retptr = &info->result; | |
489 | ||
490 | page_store.pages = alloc_info.ppn_va; | |
491 | page_store.len = alloc_info.num_ppns; | |
492 | ||
493 | vmci_status = vmci_qp_broker_alloc(alloc_info.handle, | |
494 | alloc_info.peer, | |
495 | alloc_info.flags, | |
496 | VMCI_NO_PRIVILEGE_FLAGS, | |
497 | alloc_info.produce_size, | |
498 | alloc_info.consume_size, | |
499 | &page_store, | |
500 | vmci_host_dev->context); | |
501 | } | |
502 | ||
503 | if (put_user(vmci_status, retptr)) { | |
504 | if (vmci_status >= VMCI_SUCCESS) { | |
505 | vmci_status = vmci_qp_broker_detach(handle, | |
506 | vmci_host_dev->context); | |
507 | } | |
508 | return -EFAULT; | |
509 | } | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
514 | static int vmci_host_do_queuepair_setva(struct vmci_host_dev *vmci_host_dev, | |
515 | const char *ioctl_name, | |
516 | void __user *uptr) | |
517 | { | |
518 | struct vmci_qp_set_va_info set_va_info; | |
519 | struct vmci_qp_set_va_info __user *info = uptr; | |
520 | s32 result; | |
521 | ||
522 | if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { | |
523 | vmci_ioctl_err("only valid for contexts\n"); | |
524 | return -EINVAL; | |
525 | } | |
526 | ||
527 | if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) { | |
528 | vmci_ioctl_err("is not allowed\n"); | |
529 | return -EINVAL; | |
530 | } | |
531 | ||
532 | if (copy_from_user(&set_va_info, uptr, sizeof(set_va_info))) | |
533 | return -EFAULT; | |
534 | ||
535 | if (set_va_info.va) { | |
536 | /* | |
537 | * VMX is passing down a new VA for the queue | |
538 | * pair mapping. | |
539 | */ | |
540 | result = vmci_qp_broker_map(set_va_info.handle, | |
541 | vmci_host_dev->context, | |
542 | set_va_info.va); | |
543 | } else { | |
544 | /* | |
545 | * The queue pair is about to be unmapped by | |
546 | * the VMX. | |
547 | */ | |
548 | result = vmci_qp_broker_unmap(set_va_info.handle, | |
549 | vmci_host_dev->context, 0); | |
550 | } | |
551 | ||
552 | return put_user(result, &info->result) ? -EFAULT : 0; | |
553 | } | |
554 | ||
555 | static int vmci_host_do_queuepair_setpf(struct vmci_host_dev *vmci_host_dev, | |
556 | const char *ioctl_name, | |
557 | void __user *uptr) | |
558 | { | |
559 | struct vmci_qp_page_file_info page_file_info; | |
560 | struct vmci_qp_page_file_info __user *info = uptr; | |
561 | s32 result; | |
562 | ||
563 | if (vmci_host_dev->user_version < VMCI_VERSION_HOSTQP || | |
564 | vmci_host_dev->user_version >= VMCI_VERSION_NOVMVM) { | |
565 | vmci_ioctl_err("not supported on this VMX (version=%d)\n", | |
566 | vmci_host_dev->user_version); | |
567 | return -EINVAL; | |
568 | } | |
569 | ||
570 | if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { | |
571 | vmci_ioctl_err("only valid for contexts\n"); | |
572 | return -EINVAL; | |
573 | } | |
574 | ||
575 | if (copy_from_user(&page_file_info, uptr, sizeof(*info))) | |
576 | return -EFAULT; | |
577 | ||
578 | /* | |
579 | * Communicate success pre-emptively to the caller. Note that the | |
580 | * basic premise is that it is incumbent upon the caller not to look at | |
581 | * the info.result field until after the ioctl() returns. And then, | |
582 | * only if the ioctl() result indicates no error. We send up the | |
583 | * SUCCESS status before calling SetPageStore() store because failing | |
584 | * to copy up the result code means unwinding the SetPageStore(). | |
585 | * | |
586 | * It turns out the logic to unwind a SetPageStore() opens a can of | |
587 | * worms. For example, if a host had created the queue_pair and a | |
588 | * guest attaches and SetPageStore() is successful but writing success | |
589 | * fails, then ... the host has to be stopped from writing (anymore) | |
590 | * data into the queue_pair. That means an additional test in the | |
591 | * VMCI_Enqueue() code path. Ugh. | |
592 | */ | |
593 | ||
594 | if (put_user(VMCI_SUCCESS, &info->result)) { | |
595 | /* | |
596 | * In this case, we can't write a result field of the | |
597 | * caller's info block. So, we don't even try to | |
598 | * SetPageStore(). | |
599 | */ | |
600 | return -EFAULT; | |
601 | } | |
602 | ||
603 | result = vmci_qp_broker_set_page_store(page_file_info.handle, | |
604 | page_file_info.produce_va, | |
605 | page_file_info.consume_va, | |
606 | vmci_host_dev->context); | |
607 | if (result < VMCI_SUCCESS) { | |
608 | if (put_user(result, &info->result)) { | |
609 | /* | |
610 | * Note that in this case the SetPageStore() | |
611 | * call failed but we were unable to | |
612 | * communicate that to the caller (because the | |
613 | * copy_to_user() call failed). So, if we | |
614 | * simply return an error (in this case | |
615 | * -EFAULT) then the caller will know that the | |
616 | * SetPageStore failed even though we couldn't | |
617 | * put the result code in the result field and | |
618 | * indicate exactly why it failed. | |
619 | * | |
620 | * That says nothing about the issue where we | |
621 | * were once able to write to the caller's info | |
622 | * memory and now can't. Something more | |
623 | * serious is probably going on than the fact | |
624 | * that SetPageStore() didn't work. | |
625 | */ | |
626 | return -EFAULT; | |
627 | } | |
628 | } | |
629 | ||
630 | return 0; | |
631 | } | |
632 | ||
633 | static int vmci_host_do_qp_detach(struct vmci_host_dev *vmci_host_dev, | |
634 | const char *ioctl_name, | |
635 | void __user *uptr) | |
636 | { | |
637 | struct vmci_qp_dtch_info detach_info; | |
638 | struct vmci_qp_dtch_info __user *info = uptr; | |
639 | s32 result; | |
640 | ||
641 | if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { | |
642 | vmci_ioctl_err("only valid for contexts\n"); | |
643 | return -EINVAL; | |
644 | } | |
645 | ||
646 | if (copy_from_user(&detach_info, uptr, sizeof(detach_info))) | |
647 | return -EFAULT; | |
648 | ||
649 | result = vmci_qp_broker_detach(detach_info.handle, | |
650 | vmci_host_dev->context); | |
651 | if (result == VMCI_SUCCESS && | |
652 | vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) { | |
653 | result = VMCI_SUCCESS_LAST_DETACH; | |
654 | } | |
655 | ||
656 | return put_user(result, &info->result) ? -EFAULT : 0; | |
657 | } | |
658 | ||
659 | static int vmci_host_do_ctx_add_notify(struct vmci_host_dev *vmci_host_dev, | |
660 | const char *ioctl_name, | |
661 | void __user *uptr) | |
662 | { | |
663 | struct vmci_ctx_info ar_info; | |
664 | struct vmci_ctx_info __user *info = uptr; | |
665 | s32 result; | |
666 | u32 cid; | |
667 | ||
668 | if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { | |
669 | vmci_ioctl_err("only valid for contexts\n"); | |
670 | return -EINVAL; | |
671 | } | |
672 | ||
673 | if (copy_from_user(&ar_info, uptr, sizeof(ar_info))) | |
674 | return -EFAULT; | |
675 | ||
676 | cid = vmci_ctx_get_id(vmci_host_dev->context); | |
677 | result = vmci_ctx_add_notification(cid, ar_info.remote_cid); | |
678 | ||
679 | return put_user(result, &info->result) ? -EFAULT : 0; | |
680 | } | |
681 | ||
682 | static int vmci_host_do_ctx_remove_notify(struct vmci_host_dev *vmci_host_dev, | |
683 | const char *ioctl_name, | |
684 | void __user *uptr) | |
685 | { | |
686 | struct vmci_ctx_info ar_info; | |
687 | struct vmci_ctx_info __user *info = uptr; | |
688 | u32 cid; | |
689 | int result; | |
690 | ||
691 | if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { | |
692 | vmci_ioctl_err("only valid for contexts\n"); | |
693 | return -EINVAL; | |
694 | } | |
695 | ||
696 | if (copy_from_user(&ar_info, uptr, sizeof(ar_info))) | |
697 | return -EFAULT; | |
698 | ||
699 | cid = vmci_ctx_get_id(vmci_host_dev->context); | |
700 | result = vmci_ctx_remove_notification(cid, | |
701 | ar_info.remote_cid); | |
702 | ||
703 | return put_user(result, &info->result) ? -EFAULT : 0; | |
704 | } | |
705 | ||
706 | static int vmci_host_do_ctx_get_cpt_state(struct vmci_host_dev *vmci_host_dev, | |
707 | const char *ioctl_name, | |
708 | void __user *uptr) | |
709 | { | |
710 | struct vmci_ctx_chkpt_buf_info get_info; | |
711 | u32 cid; | |
712 | void *cpt_buf; | |
713 | int retval; | |
714 | ||
715 | if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { | |
716 | vmci_ioctl_err("only valid for contexts\n"); | |
717 | return -EINVAL; | |
718 | } | |
719 | ||
720 | if (copy_from_user(&get_info, uptr, sizeof(get_info))) | |
721 | return -EFAULT; | |
722 | ||
723 | cid = vmci_ctx_get_id(vmci_host_dev->context); | |
724 | get_info.result = vmci_ctx_get_chkpt_state(cid, get_info.cpt_type, | |
725 | &get_info.buf_size, &cpt_buf); | |
726 | if (get_info.result == VMCI_SUCCESS && get_info.buf_size) { | |
727 | void __user *ubuf = (void __user *)(uintptr_t)get_info.cpt_buf; | |
728 | retval = copy_to_user(ubuf, cpt_buf, get_info.buf_size); | |
729 | kfree(cpt_buf); | |
730 | ||
731 | if (retval) | |
732 | return -EFAULT; | |
733 | } | |
734 | ||
735 | return copy_to_user(uptr, &get_info, sizeof(get_info)) ? -EFAULT : 0; | |
736 | } | |
737 | ||
738 | static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev, | |
739 | const char *ioctl_name, | |
740 | void __user *uptr) | |
741 | { | |
742 | struct vmci_ctx_chkpt_buf_info set_info; | |
743 | u32 cid; | |
744 | void *cpt_buf; | |
745 | int retval; | |
746 | ||
747 | if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { | |
748 | vmci_ioctl_err("only valid for contexts\n"); | |
749 | return -EINVAL; | |
750 | } | |
751 | ||
752 | if (copy_from_user(&set_info, uptr, sizeof(set_info))) | |
753 | return -EFAULT; | |
754 | ||
755 | cpt_buf = kmalloc(set_info.buf_size, GFP_KERNEL); | |
756 | if (!cpt_buf) { | |
757 | vmci_ioctl_err( | |
758 | "cannot allocate memory to set cpt state (type=%d)\n", | |
759 | set_info.cpt_type); | |
760 | return -ENOMEM; | |
761 | } | |
762 | ||
763 | if (copy_from_user(cpt_buf, (void __user *)(uintptr_t)set_info.cpt_buf, | |
764 | set_info.buf_size)) { | |
765 | retval = -EFAULT; | |
766 | goto out; | |
767 | } | |
768 | ||
769 | cid = vmci_ctx_get_id(vmci_host_dev->context); | |
770 | set_info.result = vmci_ctx_set_chkpt_state(cid, set_info.cpt_type, | |
771 | set_info.buf_size, cpt_buf); | |
772 | ||
773 | retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0; | |
774 | ||
775 | out: | |
776 | kfree(cpt_buf); | |
777 | return retval; | |
778 | } | |
779 | ||
780 | static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev, | |
781 | const char *ioctl_name, | |
782 | void __user *uptr) | |
783 | { | |
784 | u32 __user *u32ptr = uptr; | |
785 | ||
786 | return put_user(VMCI_HOST_CONTEXT_ID, u32ptr) ? -EFAULT : 0; | |
787 | } | |
788 | ||
789 | static int vmci_host_do_set_notify(struct vmci_host_dev *vmci_host_dev, | |
790 | const char *ioctl_name, | |
791 | void __user *uptr) | |
792 | { | |
793 | struct vmci_set_notify_info notify_info; | |
794 | ||
795 | if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { | |
796 | vmci_ioctl_err("only valid for contexts\n"); | |
797 | return -EINVAL; | |
798 | } | |
799 | ||
800 | if (copy_from_user(¬ify_info, uptr, sizeof(notify_info))) | |
801 | return -EFAULT; | |
802 | ||
803 | if (notify_info.notify_uva) { | |
804 | notify_info.result = | |
805 | vmci_host_setup_notify(vmci_host_dev->context, | |
806 | notify_info.notify_uva); | |
807 | } else { | |
808 | vmci_ctx_unset_notify(vmci_host_dev->context); | |
809 | notify_info.result = VMCI_SUCCESS; | |
810 | } | |
811 | ||
812 | return copy_to_user(uptr, ¬ify_info, sizeof(notify_info)) ? | |
813 | -EFAULT : 0; | |
814 | } | |
815 | ||
816 | static int vmci_host_do_notify_resource(struct vmci_host_dev *vmci_host_dev, | |
817 | const char *ioctl_name, | |
818 | void __user *uptr) | |
819 | { | |
820 | struct vmci_dbell_notify_resource_info info; | |
821 | u32 cid; | |
822 | ||
823 | if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) { | |
824 | vmci_ioctl_err("invalid for current VMX versions\n"); | |
825 | return -EINVAL; | |
826 | } | |
827 | ||
828 | if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { | |
829 | vmci_ioctl_err("only valid for contexts\n"); | |
830 | return -EINVAL; | |
831 | } | |
832 | ||
833 | if (copy_from_user(&info, uptr, sizeof(info))) | |
834 | return -EFAULT; | |
835 | ||
836 | cid = vmci_ctx_get_id(vmci_host_dev->context); | |
837 | ||
838 | switch (info.action) { | |
839 | case VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY: | |
840 | if (info.resource == VMCI_NOTIFY_RESOURCE_DOOR_BELL) { | |
841 | u32 flags = VMCI_NO_PRIVILEGE_FLAGS; | |
842 | info.result = vmci_ctx_notify_dbell(cid, info.handle, | |
843 | flags); | |
844 | } else { | |
845 | info.result = VMCI_ERROR_UNAVAILABLE; | |
846 | } | |
847 | break; | |
848 | ||
849 | case VMCI_NOTIFY_RESOURCE_ACTION_CREATE: | |
850 | info.result = vmci_ctx_dbell_create(cid, info.handle); | |
851 | break; | |
852 | ||
853 | case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY: | |
854 | info.result = vmci_ctx_dbell_destroy(cid, info.handle); | |
855 | break; | |
856 | ||
857 | default: | |
858 | vmci_ioctl_err("got unknown action (action=%d)\n", | |
859 | info.action); | |
860 | info.result = VMCI_ERROR_INVALID_ARGS; | |
861 | } | |
862 | ||
863 | return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0; | |
864 | } | |
865 | ||
866 | static int vmci_host_do_recv_notifications(struct vmci_host_dev *vmci_host_dev, | |
867 | const char *ioctl_name, | |
868 | void __user *uptr) | |
869 | { | |
870 | struct vmci_ctx_notify_recv_info info; | |
871 | struct vmci_handle_arr *db_handle_array; | |
872 | struct vmci_handle_arr *qp_handle_array; | |
873 | void __user *ubuf; | |
874 | u32 cid; | |
875 | int retval = 0; | |
876 | ||
877 | if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { | |
878 | vmci_ioctl_err("only valid for contexts\n"); | |
879 | return -EINVAL; | |
880 | } | |
881 | ||
882 | if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) { | |
883 | vmci_ioctl_err("not supported for the current vmx version\n"); | |
884 | return -EINVAL; | |
885 | } | |
886 | ||
887 | if (copy_from_user(&info, uptr, sizeof(info))) | |
888 | return -EFAULT; | |
889 | ||
890 | if ((info.db_handle_buf_size && !info.db_handle_buf_uva) || | |
891 | (info.qp_handle_buf_size && !info.qp_handle_buf_uva)) { | |
892 | return -EINVAL; | |
893 | } | |
894 | ||
895 | cid = vmci_ctx_get_id(vmci_host_dev->context); | |
896 | ||
897 | info.result = vmci_ctx_rcv_notifications_get(cid, | |
898 | &db_handle_array, &qp_handle_array); | |
899 | if (info.result != VMCI_SUCCESS) | |
900 | return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0; | |
901 | ||
902 | ubuf = (void __user *)(uintptr_t)info.db_handle_buf_uva; | |
903 | info.result = drv_cp_harray_to_user(ubuf, &info.db_handle_buf_size, | |
904 | db_handle_array, &retval); | |
905 | if (info.result == VMCI_SUCCESS && !retval) { | |
906 | ubuf = (void __user *)(uintptr_t)info.qp_handle_buf_uva; | |
907 | info.result = drv_cp_harray_to_user(ubuf, | |
908 | &info.qp_handle_buf_size, | |
909 | qp_handle_array, &retval); | |
910 | } | |
911 | ||
912 | if (!retval && copy_to_user(uptr, &info, sizeof(info))) | |
913 | retval = -EFAULT; | |
914 | ||
915 | vmci_ctx_rcv_notifications_release(cid, | |
916 | db_handle_array, qp_handle_array, | |
917 | info.result == VMCI_SUCCESS && !retval); | |
918 | ||
919 | return retval; | |
920 | } | |
921 | ||
922 | static long vmci_host_unlocked_ioctl(struct file *filp, | |
923 | unsigned int iocmd, unsigned long ioarg) | |
924 | { | |
925 | #define VMCI_DO_IOCTL(ioctl_name, ioctl_fn) do { \ | |
926 | char *name = __stringify(IOCTL_VMCI_ ## ioctl_name); \ | |
927 | return vmci_host_do_ ## ioctl_fn( \ | |
928 | vmci_host_dev, name, uptr); \ | |
929 | } while (0) | |
930 | ||
931 | struct vmci_host_dev *vmci_host_dev = filp->private_data; | |
932 | void __user *uptr = (void __user *)ioarg; | |
933 | ||
934 | switch (iocmd) { | |
935 | case IOCTL_VMCI_INIT_CONTEXT: | |
936 | VMCI_DO_IOCTL(INIT_CONTEXT, init_context); | |
937 | case IOCTL_VMCI_DATAGRAM_SEND: | |
938 | VMCI_DO_IOCTL(DATAGRAM_SEND, send_datagram); | |
939 | case IOCTL_VMCI_DATAGRAM_RECEIVE: | |
940 | VMCI_DO_IOCTL(DATAGRAM_RECEIVE, receive_datagram); | |
941 | case IOCTL_VMCI_QUEUEPAIR_ALLOC: | |
942 | VMCI_DO_IOCTL(QUEUEPAIR_ALLOC, alloc_queuepair); | |
943 | case IOCTL_VMCI_QUEUEPAIR_SETVA: | |
944 | VMCI_DO_IOCTL(QUEUEPAIR_SETVA, queuepair_setva); | |
945 | case IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE: | |
946 | VMCI_DO_IOCTL(QUEUEPAIR_SETPAGEFILE, queuepair_setpf); | |
947 | case IOCTL_VMCI_QUEUEPAIR_DETACH: | |
948 | VMCI_DO_IOCTL(QUEUEPAIR_DETACH, qp_detach); | |
949 | case IOCTL_VMCI_CTX_ADD_NOTIFICATION: | |
950 | VMCI_DO_IOCTL(CTX_ADD_NOTIFICATION, ctx_add_notify); | |
951 | case IOCTL_VMCI_CTX_REMOVE_NOTIFICATION: | |
952 | VMCI_DO_IOCTL(CTX_REMOVE_NOTIFICATION, ctx_remove_notify); | |
953 | case IOCTL_VMCI_CTX_GET_CPT_STATE: | |
954 | VMCI_DO_IOCTL(CTX_GET_CPT_STATE, ctx_get_cpt_state); | |
955 | case IOCTL_VMCI_CTX_SET_CPT_STATE: | |
956 | VMCI_DO_IOCTL(CTX_SET_CPT_STATE, ctx_set_cpt_state); | |
957 | case IOCTL_VMCI_GET_CONTEXT_ID: | |
958 | VMCI_DO_IOCTL(GET_CONTEXT_ID, get_context_id); | |
959 | case IOCTL_VMCI_SET_NOTIFY: | |
960 | VMCI_DO_IOCTL(SET_NOTIFY, set_notify); | |
961 | case IOCTL_VMCI_NOTIFY_RESOURCE: | |
962 | VMCI_DO_IOCTL(NOTIFY_RESOURCE, notify_resource); | |
963 | case IOCTL_VMCI_NOTIFICATIONS_RECEIVE: | |
964 | VMCI_DO_IOCTL(NOTIFICATIONS_RECEIVE, recv_notifications); | |
965 | ||
966 | case IOCTL_VMCI_VERSION: | |
967 | case IOCTL_VMCI_VERSION2: | |
968 | return vmci_host_get_version(vmci_host_dev, iocmd, uptr); | |
969 | ||
970 | default: | |
971 | pr_devel("%s: Unknown ioctl (iocmd=%d)\n", __func__, iocmd); | |
972 | return -EINVAL; | |
973 | } | |
974 | ||
975 | #undef VMCI_DO_IOCTL | |
976 | } | |
977 | ||
978 | static const struct file_operations vmuser_fops = { | |
979 | .owner = THIS_MODULE, | |
980 | .open = vmci_host_open, | |
981 | .release = vmci_host_close, | |
982 | .poll = vmci_host_poll, | |
983 | .unlocked_ioctl = vmci_host_unlocked_ioctl, | |
984 | .compat_ioctl = vmci_host_unlocked_ioctl, | |
985 | }; | |
986 | ||
987 | static struct miscdevice vmci_host_miscdev = { | |
988 | .name = "vmci", | |
989 | .minor = MISC_DYNAMIC_MINOR, | |
990 | .fops = &vmuser_fops, | |
991 | }; | |
992 | ||
993 | int __init vmci_host_init(void) | |
994 | { | |
995 | int error; | |
996 | ||
997 | host_context = vmci_ctx_create(VMCI_HOST_CONTEXT_ID, | |
998 | VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS, | |
999 | -1, VMCI_VERSION, NULL); | |
1000 | if (IS_ERR(host_context)) { | |
1001 | error = PTR_ERR(host_context); | |
1002 | pr_warn("Failed to initialize VMCIContext (error%d)\n", | |
1003 | error); | |
1004 | return error; | |
1005 | } | |
1006 | ||
1007 | error = misc_register(&vmci_host_miscdev); | |
1008 | if (error) { | |
1009 | pr_warn("Module registration error (name=%s, major=%d, minor=%d, err=%d)\n", | |
1010 | vmci_host_miscdev.name, | |
1011 | MISC_MAJOR, vmci_host_miscdev.minor, | |
1012 | error); | |
1013 | pr_warn("Unable to initialize host personality\n"); | |
1014 | vmci_ctx_destroy(host_context); | |
1015 | return error; | |
1016 | } | |
1017 | ||
1018 | pr_info("VMCI host device registered (name=%s, major=%d, minor=%d)\n", | |
1019 | vmci_host_miscdev.name, MISC_MAJOR, vmci_host_miscdev.minor); | |
1020 | ||
1021 | vmci_host_device_initialized = true; | |
1022 | return 0; | |
1023 | } | |
1024 | ||
1025 | void __exit vmci_host_exit(void) | |
1026 | { | |
1027 | int error; | |
1028 | ||
1029 | vmci_host_device_initialized = false; | |
1030 | ||
1031 | error = misc_deregister(&vmci_host_miscdev); | |
1032 | if (error) | |
1033 | pr_warn("Error unregistering character device: %d\n", error); | |
1034 | ||
1035 | vmci_ctx_destroy(host_context); | |
1036 | vmci_qp_broker_exit(); | |
1037 | ||
1038 | pr_debug("VMCI host driver module unloaded\n"); | |
1039 | } |