drivers/misc/vmw_vmci/vmci_host.c

   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>
  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
  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          */
 246         retval = get_user_pages_fast(PAGE_ALIGN(uva), 1, 1, &page);
 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(&notify_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, &notify_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 }