4 * Copyright (C) 2012 VMware, Inc. All rights reserved.
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.
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
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>
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>
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"
45 #define VMCI_UTIL_NUM_RESOURCES 1
48 VMCI_NOTIFY_RESOURCE_QUEUE_PAIR = 0,
49 VMCI_NOTIFY_RESOURCE_DOOR_BELL = 1,
53 VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY = 0,
54 VMCI_NOTIFY_RESOURCE_ACTION_CREATE = 1,
55 VMCI_NOTIFY_RESOURCE_ACTION_DESTROY = 2,
59 * VMCI driver initialization. This block can also be used to
60 * pass initial group membership etc.
62 struct vmci_init_blk {
67 /* VMCIqueue_pairAllocInfo_VMToVM */
68 struct vmci_qp_alloc_info_vmvm {
69 struct vmci_handle handle;
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. */
82 /* VMCISetNotifyInfo: Used to pass notify flag's address to the host driver. */
83 struct vmci_set_notify_info {
90 * Per-instance host state
92 struct vmci_host_dev {
93 struct vmci_ctx *context;
95 enum vmci_obj_type ct_type;
96 struct mutex lock; /* Mutex lock for vmci context access */
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);
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.
112 bool vmci_host_code_active(void)
114 return vmci_host_device_initialized &&
115 (!vmci_guest_code_active() ||
116 atomic_read(&vmci_host_active_users) > 0);
120 * Called on open of /dev/vmci.
122 static int vmci_host_open(struct inode *inode, struct file *filp)
124 struct vmci_host_dev *vmci_host_dev;
126 vmci_host_dev = kzalloc(sizeof(struct vmci_host_dev), GFP_KERNEL);
127 if (vmci_host_dev == NULL)
130 vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
131 mutex_init(&vmci_host_dev->lock);
132 filp->private_data = vmci_host_dev;
138 * Called on close of /dev/vmci, most often when the process
141 static int vmci_host_close(struct inode *inode, struct file *filp)
143 struct vmci_host_dev *vmci_host_dev = filp->private_data;
145 if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
146 vmci_ctx_destroy(vmci_host_dev->context);
147 vmci_host_dev->context = NULL;
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
155 atomic_dec(&vmci_host_active_users);
157 vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
159 kfree(vmci_host_dev);
160 filp->private_data = NULL;
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.
168 static unsigned int vmci_host_poll(struct file *filp, poll_table *wait)
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;
174 if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
175 /* Check for VMCI calls to this VM context. */
177 poll_wait(filp, &context->host_context.wait_queue,
180 spin_lock(&context->lock);
181 if (context->pending_datagrams > 0 ||
182 vmci_handle_arr_get_size(
183 context->pending_doorbell_array) > 0) {
186 spin_unlock(&context->lock);
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,
197 static int drv_cp_harray_to_user(void __user *user_buf_uva,
199 struct vmci_handle_arr *handle_array,
203 struct vmci_handle *handles;
206 array_size = vmci_handle_arr_get_size(handle_array);
208 if (array_size * sizeof(*handles) > *user_buf_size)
209 return VMCI_ERROR_MORE_DATA;
211 *user_buf_size = array_size * sizeof(*handles);
213 *retval = copy_to_user(user_buf_uva,
214 vmci_handle_arr_get_handles
215 (handle_array), *user_buf_size);
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.
224 static int vmci_host_setup_notify(struct vmci_ctx *context,
230 if (context->notify_page) {
231 pr_devel("%s: Notify mechanism is already set up\n", __func__);
232 return VMCI_ERROR_DUPLICATE_ENTRY;
236 * We are using 'bool' internally, but let's make sure we explicit
239 BUILD_BUG_ON(sizeof(bool) != sizeof(u8));
240 if (!access_ok(VERIFY_WRITE, (void __user *)uva, sizeof(u8)))
241 return VMCI_ERROR_GENERIC;
244 * Lock physical page backing a given user VA.
246 retval = get_user_pages_fast(PAGE_ALIGN(uva), 1, 1, &page);
248 return VMCI_ERROR_GENERIC;
251 * Map the locked page and set up notify pointer.
253 context->notify = kmap(page) + (uva & (PAGE_SIZE - 1));
254 vmci_ctx_check_signal_notify(context);
259 static int vmci_host_get_version(struct vmci_host_dev *vmci_host_dev,
260 unsigned int cmd, void __user *uptr)
262 if (cmd == IOCTL_VMCI_VERSION2) {
263 int __user *vptr = uptr;
264 if (get_user(vmci_host_dev->user_version, vptr))
269 * The basic logic here is:
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.
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.
282 if (vmci_host_dev->user_version > 0 &&
283 vmci_host_dev->user_version < VMCI_VERSION_HOSTQP) {
284 return vmci_host_dev->user_version;
290 #define vmci_ioctl_err(fmt, ...) \
291 pr_devel("%s: " fmt, ioctl_name, ##__VA_ARGS__)
293 static int vmci_host_do_init_context(struct vmci_host_dev *vmci_host_dev,
294 const char *ioctl_name,
297 struct vmci_init_blk init_block;
298 const struct cred *cred;
301 if (copy_from_user(&init_block, uptr, sizeof(init_block))) {
302 vmci_ioctl_err("error reading init block\n");
306 mutex_lock(&vmci_host_dev->lock);
308 if (vmci_host_dev->ct_type != VMCIOBJ_NOT_SET) {
309 vmci_ioctl_err("received VMCI init on initialized handle\n");
314 if (init_block.flags & ~VMCI_PRIVILEGE_FLAG_RESTRICTED) {
315 vmci_ioctl_err("unsupported VMCI restriction flag\n");
320 cred = get_current_cred();
321 vmci_host_dev->context = vmci_ctx_create(init_block.cid,
323 vmci_host_dev->user_version,
326 if (IS_ERR(vmci_host_dev->context)) {
327 retval = PTR_ERR(vmci_host_dev->context);
328 vmci_ioctl_err("error initializing context\n");
333 * Copy cid to userlevel, we do this to allow the VMX
334 * to enforce its policy on cid generation.
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");
345 vmci_host_dev->ct_type = VMCIOBJ_CONTEXT;
346 atomic_inc(&vmci_host_active_users);
351 mutex_unlock(&vmci_host_dev->lock);
355 static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev,
356 const char *ioctl_name,
359 struct vmci_datagram_snd_rcv_info send_info;
360 struct vmci_datagram *dg = NULL;
363 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
364 vmci_ioctl_err("only valid for contexts\n");
368 if (copy_from_user(&send_info, uptr, sizeof(send_info)))
371 if (send_info.len > VMCI_MAX_DG_SIZE) {
372 vmci_ioctl_err("datagram is too big (size=%d)\n",
377 if (send_info.len < sizeof(*dg)) {
378 vmci_ioctl_err("datagram is too small (size=%d)\n",
383 dg = kmalloc(send_info.len, GFP_KERNEL);
386 "cannot allocate memory to dispatch datagram\n");
390 if (copy_from_user(dg, (void __user *)(uintptr_t)send_info.addr,
392 vmci_ioctl_err("error getting datagram\n");
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);
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);
407 return copy_to_user(uptr, &send_info, sizeof(send_info)) ? -EFAULT : 0;
410 static int vmci_host_do_receive_datagram(struct vmci_host_dev *vmci_host_dev,
411 const char *ioctl_name,
414 struct vmci_datagram_snd_rcv_info recv_info;
415 struct vmci_datagram *dg = NULL;
419 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
420 vmci_ioctl_err("only valid for contexts\n");
424 if (copy_from_user(&recv_info, uptr, sizeof(recv_info)))
427 size = recv_info.len;
428 recv_info.result = vmci_ctx_dequeue_datagram(vmci_host_dev->context,
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));
439 return copy_to_user(uptr, &recv_info, sizeof(recv_info)) ? -EFAULT : 0;
442 static int vmci_host_do_alloc_queuepair(struct vmci_host_dev *vmci_host_dev,
443 const char *ioctl_name,
446 struct vmci_handle handle;
451 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
452 vmci_ioctl_err("only valid for contexts\n");
456 cid = vmci_ctx_get_id(vmci_host_dev->context);
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;
462 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
465 handle = alloc_info.handle;
466 retptr = &info->result;
468 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
471 VMCI_NO_PRIVILEGE_FLAGS,
472 alloc_info.produce_size,
473 alloc_info.consume_size,
475 vmci_host_dev->context);
477 if (vmci_status == VMCI_SUCCESS)
478 vmci_status = VMCI_SUCCESS_QUEUEPAIR_CREATE;
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;
484 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
487 handle = alloc_info.handle;
488 retptr = &info->result;
490 page_store.pages = alloc_info.ppn_va;
491 page_store.len = alloc_info.num_ppns;
493 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
496 VMCI_NO_PRIVILEGE_FLAGS,
497 alloc_info.produce_size,
498 alloc_info.consume_size,
500 vmci_host_dev->context);
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);
514 static int vmci_host_do_queuepair_setva(struct vmci_host_dev *vmci_host_dev,
515 const char *ioctl_name,
518 struct vmci_qp_set_va_info set_va_info;
519 struct vmci_qp_set_va_info __user *info = uptr;
522 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
523 vmci_ioctl_err("only valid for contexts\n");
527 if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
528 vmci_ioctl_err("is not allowed\n");
532 if (copy_from_user(&set_va_info, uptr, sizeof(set_va_info)))
535 if (set_va_info.va) {
537 * VMX is passing down a new VA for the queue
540 result = vmci_qp_broker_map(set_va_info.handle,
541 vmci_host_dev->context,
545 * The queue pair is about to be unmapped by
548 result = vmci_qp_broker_unmap(set_va_info.handle,
549 vmci_host_dev->context, 0);
552 return put_user(result, &info->result) ? -EFAULT : 0;
555 static int vmci_host_do_queuepair_setpf(struct vmci_host_dev *vmci_host_dev,
556 const char *ioctl_name,
559 struct vmci_qp_page_file_info page_file_info;
560 struct vmci_qp_page_file_info __user *info = uptr;
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);
570 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
571 vmci_ioctl_err("only valid for contexts\n");
575 if (copy_from_user(&page_file_info, uptr, sizeof(*info)))
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().
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.
594 if (put_user(VMCI_SUCCESS, &info->result)) {
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
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)) {
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.
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.
633 static int vmci_host_do_qp_detach(struct vmci_host_dev *vmci_host_dev,
634 const char *ioctl_name,
637 struct vmci_qp_dtch_info detach_info;
638 struct vmci_qp_dtch_info __user *info = uptr;
641 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
642 vmci_ioctl_err("only valid for contexts\n");
646 if (copy_from_user(&detach_info, uptr, sizeof(detach_info)))
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;
656 return put_user(result, &info->result) ? -EFAULT : 0;
659 static int vmci_host_do_ctx_add_notify(struct vmci_host_dev *vmci_host_dev,
660 const char *ioctl_name,
663 struct vmci_ctx_info ar_info;
664 struct vmci_ctx_info __user *info = uptr;
668 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
669 vmci_ioctl_err("only valid for contexts\n");
673 if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
676 cid = vmci_ctx_get_id(vmci_host_dev->context);
677 result = vmci_ctx_add_notification(cid, ar_info.remote_cid);
679 return put_user(result, &info->result) ? -EFAULT : 0;
682 static int vmci_host_do_ctx_remove_notify(struct vmci_host_dev *vmci_host_dev,
683 const char *ioctl_name,
686 struct vmci_ctx_info ar_info;
687 struct vmci_ctx_info __user *info = uptr;
691 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
692 vmci_ioctl_err("only valid for contexts\n");
696 if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
699 cid = vmci_ctx_get_id(vmci_host_dev->context);
700 result = vmci_ctx_remove_notification(cid,
703 return put_user(result, &info->result) ? -EFAULT : 0;
706 static int vmci_host_do_ctx_get_cpt_state(struct vmci_host_dev *vmci_host_dev,
707 const char *ioctl_name,
710 struct vmci_ctx_chkpt_buf_info get_info;
715 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
716 vmci_ioctl_err("only valid for contexts\n");
720 if (copy_from_user(&get_info, uptr, sizeof(get_info)))
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);
735 return copy_to_user(uptr, &get_info, sizeof(get_info)) ? -EFAULT : 0;
738 static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,
739 const char *ioctl_name,
742 struct vmci_ctx_chkpt_buf_info set_info;
747 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
748 vmci_ioctl_err("only valid for contexts\n");
752 if (copy_from_user(&set_info, uptr, sizeof(set_info)))
755 cpt_buf = kmalloc(set_info.buf_size, GFP_KERNEL);
758 "cannot allocate memory to set cpt state (type=%d)\n",
763 if (copy_from_user(cpt_buf, (void __user *)(uintptr_t)set_info.cpt_buf,
764 set_info.buf_size)) {
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);
773 retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;
780 static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev,
781 const char *ioctl_name,
784 u32 __user *u32ptr = uptr;
786 return put_user(VMCI_HOST_CONTEXT_ID, u32ptr) ? -EFAULT : 0;
789 static int vmci_host_do_set_notify(struct vmci_host_dev *vmci_host_dev,
790 const char *ioctl_name,
793 struct vmci_set_notify_info notify_info;
795 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
796 vmci_ioctl_err("only valid for contexts\n");
800 if (copy_from_user(¬ify_info, uptr, sizeof(notify_info)))
803 if (notify_info.notify_uva) {
805 vmci_host_setup_notify(vmci_host_dev->context,
806 notify_info.notify_uva);
808 vmci_ctx_unset_notify(vmci_host_dev->context);
809 notify_info.result = VMCI_SUCCESS;
812 return copy_to_user(uptr, ¬ify_info, sizeof(notify_info)) ?
816 static int vmci_host_do_notify_resource(struct vmci_host_dev *vmci_host_dev,
817 const char *ioctl_name,
820 struct vmci_dbell_notify_resource_info info;
823 if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
824 vmci_ioctl_err("invalid for current VMX versions\n");
828 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
829 vmci_ioctl_err("only valid for contexts\n");
833 if (copy_from_user(&info, uptr, sizeof(info)))
836 cid = vmci_ctx_get_id(vmci_host_dev->context);
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,
845 info.result = VMCI_ERROR_UNAVAILABLE;
849 case VMCI_NOTIFY_RESOURCE_ACTION_CREATE:
850 info.result = vmci_ctx_dbell_create(cid, info.handle);
853 case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY:
854 info.result = vmci_ctx_dbell_destroy(cid, info.handle);
858 vmci_ioctl_err("got unknown action (action=%d)\n",
860 info.result = VMCI_ERROR_INVALID_ARGS;
863 return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
866 static int vmci_host_do_recv_notifications(struct vmci_host_dev *vmci_host_dev,
867 const char *ioctl_name,
870 struct vmci_ctx_notify_recv_info info;
871 struct vmci_handle_arr *db_handle_array;
872 struct vmci_handle_arr *qp_handle_array;
877 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
878 vmci_ioctl_err("only valid for contexts\n");
882 if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
883 vmci_ioctl_err("not supported for the current vmx version\n");
887 if (copy_from_user(&info, uptr, sizeof(info)))
890 if ((info.db_handle_buf_size && !info.db_handle_buf_uva) ||
891 (info.qp_handle_buf_size && !info.qp_handle_buf_uva)) {
895 cid = vmci_ctx_get_id(vmci_host_dev->context);
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;
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);
912 if (!retval && copy_to_user(uptr, &info, sizeof(info)))
915 vmci_ctx_rcv_notifications_release(cid,
916 db_handle_array, qp_handle_array,
917 info.result == VMCI_SUCCESS && !retval);
922 static long vmci_host_unlocked_ioctl(struct file *filp,
923 unsigned int iocmd, unsigned long ioarg)
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); \
931 struct vmci_host_dev *vmci_host_dev = filp->private_data;
932 void __user *uptr = (void __user *)ioarg;
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);
966 case IOCTL_VMCI_VERSION:
967 case IOCTL_VMCI_VERSION2:
968 return vmci_host_get_version(vmci_host_dev, iocmd, uptr);
971 pr_devel("%s: Unknown ioctl (iocmd=%d)\n", __func__, iocmd);
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,
987 static struct miscdevice vmci_host_miscdev = {
989 .minor = MISC_DYNAMIC_MINOR,
990 .fops = &vmuser_fops,
993 int __init vmci_host_init(void)
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",
1007 error = misc_register(&vmci_host_miscdev);
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,
1013 pr_warn("Unable to initialize host personality\n");
1014 vmci_ctx_destroy(host_context);
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);
1021 vmci_host_device_initialized = true;
1025 void __exit vmci_host_exit(void)
1029 vmci_host_device_initialized = false;
1031 error = misc_deregister(&vmci_host_miscdev);
1033 pr_warn("Error unregistering character device: %d\n", error);
1035 vmci_ctx_destroy(host_context);
1036 vmci_qp_broker_exit();
1038 pr_debug("VMCI host driver module unloaded\n");