1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 2012 VMware, Inc. All rights reserved.
8 #include <linux/vmw_vmci_defs.h>
9 #include <linux/vmw_vmci_api.h>
10 #include <linux/miscdevice.h>
11 #include <linux/interrupt.h>
12 #include <linux/highmem.h>
13 #include <linux/atomic.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/mutex.h>
17 #include <linux/sched.h>
18 #include <linux/cred.h>
19 #include <linux/slab.h>
20 #include <linux/file.h>
21 #include <linux/init.h>
22 #include <linux/poll.h>
23 #include <linux/pci.h>
24 #include <linux/smp.h>
28 #include "vmci_handle_array.h"
29 #include "vmci_queue_pair.h"
30 #include "vmci_datagram.h"
31 #include "vmci_doorbell.h"
32 #include "vmci_resource.h"
33 #include "vmci_context.h"
34 #include "vmci_driver.h"
35 #include "vmci_event.h"
37 #define VMCI_UTIL_NUM_RESOURCES 1
40 VMCI_NOTIFY_RESOURCE_QUEUE_PAIR = 0,
41 VMCI_NOTIFY_RESOURCE_DOOR_BELL = 1,
45 VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY = 0,
46 VMCI_NOTIFY_RESOURCE_ACTION_CREATE = 1,
47 VMCI_NOTIFY_RESOURCE_ACTION_DESTROY = 2,
51 * VMCI driver initialization. This block can also be used to
52 * pass initial group membership etc.
54 struct vmci_init_blk {
59 /* VMCIqueue_pairAllocInfo_VMToVM */
60 struct vmci_qp_alloc_info_vmvm {
61 struct vmci_handle handle;
66 u64 produce_page_file; /* User VA. */
67 u64 consume_page_file; /* User VA. */
68 u64 produce_page_file_size; /* Size of the file name array. */
69 u64 consume_page_file_size; /* Size of the file name array. */
74 /* VMCISetNotifyInfo: Used to pass notify flag's address to the host driver. */
75 struct vmci_set_notify_info {
82 * Per-instance host state
84 struct vmci_host_dev {
85 struct vmci_ctx *context;
87 enum vmci_obj_type ct_type;
88 struct mutex lock; /* Mutex lock for vmci context access */
91 static struct vmci_ctx *host_context;
92 static bool vmci_host_device_initialized;
93 static atomic_t vmci_host_active_users = ATOMIC_INIT(0);
96 * Determines whether the VMCI host personality is
97 * available. Since the core functionality of the host driver is
98 * always present, all guests could possibly use the host
99 * personality. However, to minimize the deviation from the
100 * pre-unified driver state of affairs, we only consider the host
101 * device active if there is no active guest device or if there
102 * are VMX'en with active VMCI contexts using the host device.
104 bool vmci_host_code_active(void)
106 return vmci_host_device_initialized &&
107 (!vmci_guest_code_active() ||
108 atomic_read(&vmci_host_active_users) > 0);
112 * Called on open of /dev/vmci.
114 static int vmci_host_open(struct inode *inode, struct file *filp)
116 struct vmci_host_dev *vmci_host_dev;
118 vmci_host_dev = kzalloc(sizeof(struct vmci_host_dev), GFP_KERNEL);
119 if (vmci_host_dev == NULL)
122 vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
123 mutex_init(&vmci_host_dev->lock);
124 filp->private_data = vmci_host_dev;
130 * Called on close of /dev/vmci, most often when the process
133 static int vmci_host_close(struct inode *inode, struct file *filp)
135 struct vmci_host_dev *vmci_host_dev = filp->private_data;
137 if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
138 vmci_ctx_destroy(vmci_host_dev->context);
139 vmci_host_dev->context = NULL;
142 * The number of active contexts is used to track whether any
143 * VMX'en are using the host personality. It is incremented when
144 * a context is created through the IOCTL_VMCI_INIT_CONTEXT
147 atomic_dec(&vmci_host_active_users);
149 vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
151 kfree(vmci_host_dev);
152 filp->private_data = NULL;
157 * This is used to wake up the VMX when a VMCI call arrives, or
158 * to wake up select() or poll() at the next clock tick.
160 static __poll_t vmci_host_poll(struct file *filp, poll_table *wait)
162 struct vmci_host_dev *vmci_host_dev = filp->private_data;
163 struct vmci_ctx *context = vmci_host_dev->context;
166 if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
167 /* Check for VMCI calls to this VM context. */
169 poll_wait(filp, &context->host_context.wait_queue,
172 spin_lock(&context->lock);
173 if (context->pending_datagrams > 0 ||
174 vmci_handle_arr_get_size(
175 context->pending_doorbell_array) > 0) {
178 spin_unlock(&context->lock);
184 * Copies the handles of a handle array into a user buffer, and
185 * returns the new length in userBufferSize. If the copy to the
186 * user buffer fails, the functions still returns VMCI_SUCCESS,
189 static int drv_cp_harray_to_user(void __user *user_buf_uva,
191 struct vmci_handle_arr *handle_array,
195 struct vmci_handle *handles;
198 array_size = vmci_handle_arr_get_size(handle_array);
200 if (array_size * sizeof(*handles) > *user_buf_size)
201 return VMCI_ERROR_MORE_DATA;
203 *user_buf_size = array_size * sizeof(*handles);
205 *retval = copy_to_user(user_buf_uva,
206 vmci_handle_arr_get_handles
207 (handle_array), *user_buf_size);
213 * Sets up a given context for notify to work. Maps the notify
214 * boolean in user VA into kernel space.
216 static int vmci_host_setup_notify(struct vmci_ctx *context,
221 if (context->notify_page) {
222 pr_devel("%s: Notify mechanism is already set up\n", __func__);
223 return VMCI_ERROR_DUPLICATE_ENTRY;
227 * We are using 'bool' internally, but let's make sure we explicit
230 BUILD_BUG_ON(sizeof(bool) != sizeof(u8));
231 if (!access_ok((void __user *)uva, sizeof(u8)))
232 return VMCI_ERROR_GENERIC;
235 * Lock physical page backing a given user VA.
237 retval = get_user_pages_fast(uva, 1, FOLL_WRITE, &context->notify_page);
239 context->notify_page = NULL;
240 return VMCI_ERROR_GENERIC;
244 * Map the locked page and set up notify pointer.
246 context->notify = kmap(context->notify_page) + (uva & (PAGE_SIZE - 1));
247 vmci_ctx_check_signal_notify(context);
252 static int vmci_host_get_version(struct vmci_host_dev *vmci_host_dev,
253 unsigned int cmd, void __user *uptr)
255 if (cmd == IOCTL_VMCI_VERSION2) {
256 int __user *vptr = uptr;
257 if (get_user(vmci_host_dev->user_version, vptr))
262 * The basic logic here is:
264 * If the user sends in a version of 0 tell it our version.
265 * If the user didn't send in a version, tell it our version.
266 * If the user sent in an old version, tell it -its- version.
267 * If the user sent in an newer version, tell it our version.
269 * The rationale behind telling the caller its version is that
270 * Workstation 6.5 required that VMX and VMCI kernel module were
271 * version sync'd. All new VMX users will be programmed to
272 * handle the VMCI kernel module version.
275 if (vmci_host_dev->user_version > 0 &&
276 vmci_host_dev->user_version < VMCI_VERSION_HOSTQP) {
277 return vmci_host_dev->user_version;
283 #define vmci_ioctl_err(fmt, ...) \
284 pr_devel("%s: " fmt, ioctl_name, ##__VA_ARGS__)
286 static int vmci_host_do_init_context(struct vmci_host_dev *vmci_host_dev,
287 const char *ioctl_name,
290 struct vmci_init_blk init_block;
291 const struct cred *cred;
294 if (copy_from_user(&init_block, uptr, sizeof(init_block))) {
295 vmci_ioctl_err("error reading init block\n");
299 mutex_lock(&vmci_host_dev->lock);
301 if (vmci_host_dev->ct_type != VMCIOBJ_NOT_SET) {
302 vmci_ioctl_err("received VMCI init on initialized handle\n");
307 if (init_block.flags & ~VMCI_PRIVILEGE_FLAG_RESTRICTED) {
308 vmci_ioctl_err("unsupported VMCI restriction flag\n");
313 cred = get_current_cred();
314 vmci_host_dev->context = vmci_ctx_create(init_block.cid,
316 vmci_host_dev->user_version,
319 if (IS_ERR(vmci_host_dev->context)) {
320 retval = PTR_ERR(vmci_host_dev->context);
321 vmci_ioctl_err("error initializing context\n");
326 * Copy cid to userlevel, we do this to allow the VMX
327 * to enforce its policy on cid generation.
329 init_block.cid = vmci_ctx_get_id(vmci_host_dev->context);
330 if (copy_to_user(uptr, &init_block, sizeof(init_block))) {
331 vmci_ctx_destroy(vmci_host_dev->context);
332 vmci_host_dev->context = NULL;
333 vmci_ioctl_err("error writing init block\n");
338 vmci_host_dev->ct_type = VMCIOBJ_CONTEXT;
339 atomic_inc(&vmci_host_active_users);
344 mutex_unlock(&vmci_host_dev->lock);
348 static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev,
349 const char *ioctl_name,
352 struct vmci_datagram_snd_rcv_info send_info;
353 struct vmci_datagram *dg = NULL;
356 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
357 vmci_ioctl_err("only valid for contexts\n");
361 if (copy_from_user(&send_info, uptr, sizeof(send_info)))
364 if (send_info.len > VMCI_MAX_DG_SIZE) {
365 vmci_ioctl_err("datagram is too big (size=%d)\n",
370 if (send_info.len < sizeof(*dg)) {
371 vmci_ioctl_err("datagram is too small (size=%d)\n",
376 dg = memdup_user((void __user *)(uintptr_t)send_info.addr,
380 "cannot allocate memory to dispatch datagram\n");
384 if (VMCI_DG_SIZE(dg) != send_info.len) {
385 vmci_ioctl_err("datagram size mismatch\n");
390 pr_devel("Datagram dst (handle=0x%x:0x%x) src (handle=0x%x:0x%x), payload (size=%llu bytes)\n",
391 dg->dst.context, dg->dst.resource,
392 dg->src.context, dg->src.resource,
393 (unsigned long long)dg->payload_size);
395 /* Get source context id. */
396 cid = vmci_ctx_get_id(vmci_host_dev->context);
397 send_info.result = vmci_datagram_dispatch(cid, dg, true);
400 return copy_to_user(uptr, &send_info, sizeof(send_info)) ? -EFAULT : 0;
403 static int vmci_host_do_receive_datagram(struct vmci_host_dev *vmci_host_dev,
404 const char *ioctl_name,
407 struct vmci_datagram_snd_rcv_info recv_info;
408 struct vmci_datagram *dg = NULL;
412 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
413 vmci_ioctl_err("only valid for contexts\n");
417 if (copy_from_user(&recv_info, uptr, sizeof(recv_info)))
420 size = recv_info.len;
421 recv_info.result = vmci_ctx_dequeue_datagram(vmci_host_dev->context,
424 if (recv_info.result >= VMCI_SUCCESS) {
425 void __user *ubuf = (void __user *)(uintptr_t)recv_info.addr;
426 retval = copy_to_user(ubuf, dg, VMCI_DG_SIZE(dg));
432 return copy_to_user(uptr, &recv_info, sizeof(recv_info)) ? -EFAULT : 0;
435 static int vmci_host_do_alloc_queuepair(struct vmci_host_dev *vmci_host_dev,
436 const char *ioctl_name,
439 struct vmci_handle handle;
443 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
444 vmci_ioctl_err("only valid for contexts\n");
448 if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
449 struct vmci_qp_alloc_info_vmvm alloc_info;
450 struct vmci_qp_alloc_info_vmvm __user *info = uptr;
452 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
455 handle = alloc_info.handle;
456 retptr = &info->result;
458 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
461 VMCI_NO_PRIVILEGE_FLAGS,
462 alloc_info.produce_size,
463 alloc_info.consume_size,
465 vmci_host_dev->context);
467 if (vmci_status == VMCI_SUCCESS)
468 vmci_status = VMCI_SUCCESS_QUEUEPAIR_CREATE;
470 struct vmci_qp_alloc_info alloc_info;
471 struct vmci_qp_alloc_info __user *info = uptr;
472 struct vmci_qp_page_store page_store;
474 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
477 handle = alloc_info.handle;
478 retptr = &info->result;
480 page_store.pages = alloc_info.ppn_va;
481 page_store.len = alloc_info.num_ppns;
483 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
486 VMCI_NO_PRIVILEGE_FLAGS,
487 alloc_info.produce_size,
488 alloc_info.consume_size,
490 vmci_host_dev->context);
493 if (put_user(vmci_status, retptr)) {
494 if (vmci_status >= VMCI_SUCCESS) {
495 vmci_status = vmci_qp_broker_detach(handle,
496 vmci_host_dev->context);
504 static int vmci_host_do_queuepair_setva(struct vmci_host_dev *vmci_host_dev,
505 const char *ioctl_name,
508 struct vmci_qp_set_va_info set_va_info;
509 struct vmci_qp_set_va_info __user *info = uptr;
512 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
513 vmci_ioctl_err("only valid for contexts\n");
517 if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
518 vmci_ioctl_err("is not allowed\n");
522 if (copy_from_user(&set_va_info, uptr, sizeof(set_va_info)))
525 if (set_va_info.va) {
527 * VMX is passing down a new VA for the queue
530 result = vmci_qp_broker_map(set_va_info.handle,
531 vmci_host_dev->context,
535 * The queue pair is about to be unmapped by
538 result = vmci_qp_broker_unmap(set_va_info.handle,
539 vmci_host_dev->context, 0);
542 return put_user(result, &info->result) ? -EFAULT : 0;
545 static int vmci_host_do_queuepair_setpf(struct vmci_host_dev *vmci_host_dev,
546 const char *ioctl_name,
549 struct vmci_qp_page_file_info page_file_info;
550 struct vmci_qp_page_file_info __user *info = uptr;
553 if (vmci_host_dev->user_version < VMCI_VERSION_HOSTQP ||
554 vmci_host_dev->user_version >= VMCI_VERSION_NOVMVM) {
555 vmci_ioctl_err("not supported on this VMX (version=%d)\n",
556 vmci_host_dev->user_version);
560 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
561 vmci_ioctl_err("only valid for contexts\n");
565 if (copy_from_user(&page_file_info, uptr, sizeof(*info)))
569 * Communicate success pre-emptively to the caller. Note that the
570 * basic premise is that it is incumbent upon the caller not to look at
571 * the info.result field until after the ioctl() returns. And then,
572 * only if the ioctl() result indicates no error. We send up the
573 * SUCCESS status before calling SetPageStore() store because failing
574 * to copy up the result code means unwinding the SetPageStore().
576 * It turns out the logic to unwind a SetPageStore() opens a can of
577 * worms. For example, if a host had created the queue_pair and a
578 * guest attaches and SetPageStore() is successful but writing success
579 * fails, then ... the host has to be stopped from writing (anymore)
580 * data into the queue_pair. That means an additional test in the
581 * VMCI_Enqueue() code path. Ugh.
584 if (put_user(VMCI_SUCCESS, &info->result)) {
586 * In this case, we can't write a result field of the
587 * caller's info block. So, we don't even try to
593 result = vmci_qp_broker_set_page_store(page_file_info.handle,
594 page_file_info.produce_va,
595 page_file_info.consume_va,
596 vmci_host_dev->context);
597 if (result < VMCI_SUCCESS) {
598 if (put_user(result, &info->result)) {
600 * Note that in this case the SetPageStore()
601 * call failed but we were unable to
602 * communicate that to the caller (because the
603 * copy_to_user() call failed). So, if we
604 * simply return an error (in this case
605 * -EFAULT) then the caller will know that the
606 * SetPageStore failed even though we couldn't
607 * put the result code in the result field and
608 * indicate exactly why it failed.
610 * That says nothing about the issue where we
611 * were once able to write to the caller's info
612 * memory and now can't. Something more
613 * serious is probably going on than the fact
614 * that SetPageStore() didn't work.
623 static int vmci_host_do_qp_detach(struct vmci_host_dev *vmci_host_dev,
624 const char *ioctl_name,
627 struct vmci_qp_dtch_info detach_info;
628 struct vmci_qp_dtch_info __user *info = uptr;
631 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
632 vmci_ioctl_err("only valid for contexts\n");
636 if (copy_from_user(&detach_info, uptr, sizeof(detach_info)))
639 result = vmci_qp_broker_detach(detach_info.handle,
640 vmci_host_dev->context);
641 if (result == VMCI_SUCCESS &&
642 vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
643 result = VMCI_SUCCESS_LAST_DETACH;
646 return put_user(result, &info->result) ? -EFAULT : 0;
649 static int vmci_host_do_ctx_add_notify(struct vmci_host_dev *vmci_host_dev,
650 const char *ioctl_name,
653 struct vmci_ctx_info ar_info;
654 struct vmci_ctx_info __user *info = uptr;
658 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
659 vmci_ioctl_err("only valid for contexts\n");
663 if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
666 cid = vmci_ctx_get_id(vmci_host_dev->context);
667 result = vmci_ctx_add_notification(cid, ar_info.remote_cid);
669 return put_user(result, &info->result) ? -EFAULT : 0;
672 static int vmci_host_do_ctx_remove_notify(struct vmci_host_dev *vmci_host_dev,
673 const char *ioctl_name,
676 struct vmci_ctx_info ar_info;
677 struct vmci_ctx_info __user *info = uptr;
681 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
682 vmci_ioctl_err("only valid for contexts\n");
686 if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
689 cid = vmci_ctx_get_id(vmci_host_dev->context);
690 result = vmci_ctx_remove_notification(cid,
693 return put_user(result, &info->result) ? -EFAULT : 0;
696 static int vmci_host_do_ctx_get_cpt_state(struct vmci_host_dev *vmci_host_dev,
697 const char *ioctl_name,
700 struct vmci_ctx_chkpt_buf_info get_info;
705 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
706 vmci_ioctl_err("only valid for contexts\n");
710 if (copy_from_user(&get_info, uptr, sizeof(get_info)))
713 cid = vmci_ctx_get_id(vmci_host_dev->context);
714 get_info.result = vmci_ctx_get_chkpt_state(cid, get_info.cpt_type,
715 &get_info.buf_size, &cpt_buf);
716 if (get_info.result == VMCI_SUCCESS && get_info.buf_size) {
717 void __user *ubuf = (void __user *)(uintptr_t)get_info.cpt_buf;
718 retval = copy_to_user(ubuf, cpt_buf, get_info.buf_size);
725 return copy_to_user(uptr, &get_info, sizeof(get_info)) ? -EFAULT : 0;
728 static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,
729 const char *ioctl_name,
732 struct vmci_ctx_chkpt_buf_info set_info;
737 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
738 vmci_ioctl_err("only valid for contexts\n");
742 if (copy_from_user(&set_info, uptr, sizeof(set_info)))
745 cpt_buf = memdup_user((void __user *)(uintptr_t)set_info.cpt_buf,
748 return PTR_ERR(cpt_buf);
750 cid = vmci_ctx_get_id(vmci_host_dev->context);
751 set_info.result = vmci_ctx_set_chkpt_state(cid, set_info.cpt_type,
752 set_info.buf_size, cpt_buf);
754 retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;
760 static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev,
761 const char *ioctl_name,
764 u32 __user *u32ptr = uptr;
766 return put_user(VMCI_HOST_CONTEXT_ID, u32ptr) ? -EFAULT : 0;
769 static int vmci_host_do_set_notify(struct vmci_host_dev *vmci_host_dev,
770 const char *ioctl_name,
773 struct vmci_set_notify_info notify_info;
775 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
776 vmci_ioctl_err("only valid for contexts\n");
780 if (copy_from_user(¬ify_info, uptr, sizeof(notify_info)))
783 if (notify_info.notify_uva) {
785 vmci_host_setup_notify(vmci_host_dev->context,
786 notify_info.notify_uva);
788 vmci_ctx_unset_notify(vmci_host_dev->context);
789 notify_info.result = VMCI_SUCCESS;
792 return copy_to_user(uptr, ¬ify_info, sizeof(notify_info)) ?
796 static int vmci_host_do_notify_resource(struct vmci_host_dev *vmci_host_dev,
797 const char *ioctl_name,
800 struct vmci_dbell_notify_resource_info info;
803 if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
804 vmci_ioctl_err("invalid for current VMX versions\n");
808 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
809 vmci_ioctl_err("only valid for contexts\n");
813 if (copy_from_user(&info, uptr, sizeof(info)))
816 cid = vmci_ctx_get_id(vmci_host_dev->context);
818 switch (info.action) {
819 case VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY:
820 if (info.resource == VMCI_NOTIFY_RESOURCE_DOOR_BELL) {
821 u32 flags = VMCI_NO_PRIVILEGE_FLAGS;
822 info.result = vmci_ctx_notify_dbell(cid, info.handle,
825 info.result = VMCI_ERROR_UNAVAILABLE;
829 case VMCI_NOTIFY_RESOURCE_ACTION_CREATE:
830 info.result = vmci_ctx_dbell_create(cid, info.handle);
833 case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY:
834 info.result = vmci_ctx_dbell_destroy(cid, info.handle);
838 vmci_ioctl_err("got unknown action (action=%d)\n",
840 info.result = VMCI_ERROR_INVALID_ARGS;
843 return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
846 static int vmci_host_do_recv_notifications(struct vmci_host_dev *vmci_host_dev,
847 const char *ioctl_name,
850 struct vmci_ctx_notify_recv_info info;
851 struct vmci_handle_arr *db_handle_array;
852 struct vmci_handle_arr *qp_handle_array;
857 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
858 vmci_ioctl_err("only valid for contexts\n");
862 if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
863 vmci_ioctl_err("not supported for the current vmx version\n");
867 if (copy_from_user(&info, uptr, sizeof(info)))
870 if ((info.db_handle_buf_size && !info.db_handle_buf_uva) ||
871 (info.qp_handle_buf_size && !info.qp_handle_buf_uva)) {
875 cid = vmci_ctx_get_id(vmci_host_dev->context);
877 info.result = vmci_ctx_rcv_notifications_get(cid,
878 &db_handle_array, &qp_handle_array);
879 if (info.result != VMCI_SUCCESS)
880 return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
882 ubuf = (void __user *)(uintptr_t)info.db_handle_buf_uva;
883 info.result = drv_cp_harray_to_user(ubuf, &info.db_handle_buf_size,
884 db_handle_array, &retval);
885 if (info.result == VMCI_SUCCESS && !retval) {
886 ubuf = (void __user *)(uintptr_t)info.qp_handle_buf_uva;
887 info.result = drv_cp_harray_to_user(ubuf,
888 &info.qp_handle_buf_size,
889 qp_handle_array, &retval);
892 if (!retval && copy_to_user(uptr, &info, sizeof(info)))
895 vmci_ctx_rcv_notifications_release(cid,
896 db_handle_array, qp_handle_array,
897 info.result == VMCI_SUCCESS && !retval);
902 static long vmci_host_unlocked_ioctl(struct file *filp,
903 unsigned int iocmd, unsigned long ioarg)
905 #define VMCI_DO_IOCTL(ioctl_name, ioctl_fn) do { \
906 char *name = __stringify(IOCTL_VMCI_ ## ioctl_name); \
907 return vmci_host_do_ ## ioctl_fn( \
908 vmci_host_dev, name, uptr); \
911 struct vmci_host_dev *vmci_host_dev = filp->private_data;
912 void __user *uptr = (void __user *)ioarg;
915 case IOCTL_VMCI_INIT_CONTEXT:
916 VMCI_DO_IOCTL(INIT_CONTEXT, init_context);
917 case IOCTL_VMCI_DATAGRAM_SEND:
918 VMCI_DO_IOCTL(DATAGRAM_SEND, send_datagram);
919 case IOCTL_VMCI_DATAGRAM_RECEIVE:
920 VMCI_DO_IOCTL(DATAGRAM_RECEIVE, receive_datagram);
921 case IOCTL_VMCI_QUEUEPAIR_ALLOC:
922 VMCI_DO_IOCTL(QUEUEPAIR_ALLOC, alloc_queuepair);
923 case IOCTL_VMCI_QUEUEPAIR_SETVA:
924 VMCI_DO_IOCTL(QUEUEPAIR_SETVA, queuepair_setva);
925 case IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE:
926 VMCI_DO_IOCTL(QUEUEPAIR_SETPAGEFILE, queuepair_setpf);
927 case IOCTL_VMCI_QUEUEPAIR_DETACH:
928 VMCI_DO_IOCTL(QUEUEPAIR_DETACH, qp_detach);
929 case IOCTL_VMCI_CTX_ADD_NOTIFICATION:
930 VMCI_DO_IOCTL(CTX_ADD_NOTIFICATION, ctx_add_notify);
931 case IOCTL_VMCI_CTX_REMOVE_NOTIFICATION:
932 VMCI_DO_IOCTL(CTX_REMOVE_NOTIFICATION, ctx_remove_notify);
933 case IOCTL_VMCI_CTX_GET_CPT_STATE:
934 VMCI_DO_IOCTL(CTX_GET_CPT_STATE, ctx_get_cpt_state);
935 case IOCTL_VMCI_CTX_SET_CPT_STATE:
936 VMCI_DO_IOCTL(CTX_SET_CPT_STATE, ctx_set_cpt_state);
937 case IOCTL_VMCI_GET_CONTEXT_ID:
938 VMCI_DO_IOCTL(GET_CONTEXT_ID, get_context_id);
939 case IOCTL_VMCI_SET_NOTIFY:
940 VMCI_DO_IOCTL(SET_NOTIFY, set_notify);
941 case IOCTL_VMCI_NOTIFY_RESOURCE:
942 VMCI_DO_IOCTL(NOTIFY_RESOURCE, notify_resource);
943 case IOCTL_VMCI_NOTIFICATIONS_RECEIVE:
944 VMCI_DO_IOCTL(NOTIFICATIONS_RECEIVE, recv_notifications);
946 case IOCTL_VMCI_VERSION:
947 case IOCTL_VMCI_VERSION2:
948 return vmci_host_get_version(vmci_host_dev, iocmd, uptr);
951 pr_devel("%s: Unknown ioctl (iocmd=%d)\n", __func__, iocmd);
958 static const struct file_operations vmuser_fops = {
959 .owner = THIS_MODULE,
960 .open = vmci_host_open,
961 .release = vmci_host_close,
962 .poll = vmci_host_poll,
963 .unlocked_ioctl = vmci_host_unlocked_ioctl,
964 .compat_ioctl = vmci_host_unlocked_ioctl,
967 static struct miscdevice vmci_host_miscdev = {
969 .minor = MISC_DYNAMIC_MINOR,
970 .fops = &vmuser_fops,
973 int __init vmci_host_init(void)
977 host_context = vmci_ctx_create(VMCI_HOST_CONTEXT_ID,
978 VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS,
979 -1, VMCI_VERSION, NULL);
980 if (IS_ERR(host_context)) {
981 error = PTR_ERR(host_context);
982 pr_warn("Failed to initialize VMCIContext (error%d)\n",
987 error = misc_register(&vmci_host_miscdev);
989 pr_warn("Module registration error (name=%s, major=%d, minor=%d, err=%d)\n",
990 vmci_host_miscdev.name,
991 MISC_MAJOR, vmci_host_miscdev.minor,
993 pr_warn("Unable to initialize host personality\n");
994 vmci_ctx_destroy(host_context);
998 pr_info("VMCI host device registered (name=%s, major=%d, minor=%d)\n",
999 vmci_host_miscdev.name, MISC_MAJOR, vmci_host_miscdev.minor);
1001 vmci_host_device_initialized = true;
1005 void __exit vmci_host_exit(void)
1007 vmci_host_device_initialized = false;
1009 misc_deregister(&vmci_host_miscdev);
1010 vmci_ctx_destroy(host_context);
1011 vmci_qp_broker_exit();
1013 pr_debug("VMCI host driver module unloaded\n");