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. Maps the notify
 222  * boolean in user VA into kernel space.
 223  */
 224 static int vmci_host_setup_notify(struct vmci_ctx *context,
 225                                   unsigned long uva)
 226 {
 227         int retval;
 228
 229         if (context->notify_page) {
 230                 pr_devel("%s: Notify mechanism is already set up\n", __func__);
 231                 return VMCI_ERROR_DUPLICATE_ENTRY;
 232         }
 233
 234         /*
 235          * We are using 'bool' internally, but let's make sure we explicit
 236          * about the size.
 237          */
 238         BUILD_BUG_ON(sizeof(bool) != sizeof(u8));
 239         if (!access_ok(VERIFY_WRITE, (void __user *)uva, sizeof(u8)))
 240                 return VMCI_ERROR_GENERIC;
 241
 242         /*
 243          * Lock physical page backing a given user VA.
 244          */
 245         retval = get_user_pages_fast(uva, 1, 1, &context->notify_page);
 246         if (retval != 1) {
 247                 context->notify_page = NULL;
 248                 return VMCI_ERROR_GENERIC;
 249         }
 250
 251         /*
 252          * Map the locked page and set up notify pointer.
 253          */
 254         context->notify = kmap(context->notify_page) + (uva & (PAGE_SIZE - 1));
 255         vmci_ctx_check_signal_notify(context);
 256
 257         return VMCI_SUCCESS;
 258 }
 259
 260 static int vmci_host_get_version(struct vmci_host_dev *vmci_host_dev,
 261                                  unsigned int cmd, void __user *uptr)
 262 {
 263         if (cmd == IOCTL_VMCI_VERSION2) {
 264                 int __user *vptr = uptr;
 265                 if (get_user(vmci_host_dev->user_version, vptr))
 266                         return -EFAULT;
 267         }
 268
 269         /*
 270          * The basic logic here is:
 271          *
 272          * If the user sends in a version of 0 tell it our version.
 273          * If the user didn't send in a version, tell it our version.
 274          * If the user sent in an old version, tell it -its- version.
 275          * If the user sent in an newer version, tell it our version.
 276          *
 277          * The rationale behind telling the caller its version is that
 278          * Workstation 6.5 required that VMX and VMCI kernel module were
 279          * version sync'd.  All new VMX users will be programmed to
 280          * handle the VMCI kernel module version.
 281          */
 282
 283         if (vmci_host_dev->user_version > 0 &&
 284             vmci_host_dev->user_version < VMCI_VERSION_HOSTQP) {
 285                 return vmci_host_dev->user_version;
 286         }
 287
 288         return VMCI_VERSION;
 289 }
 290
 291 #define vmci_ioctl_err(fmt, ...)        \
 292         pr_devel("%s: " fmt, ioctl_name, ##__VA_ARGS__)
 293
 294 static int vmci_host_do_init_context(struct vmci_host_dev *vmci_host_dev,
 295                                      const char *ioctl_name,
 296                                      void __user *uptr)
 297 {
 298         struct vmci_init_blk init_block;
 299         const struct cred *cred;
 300         int retval;
 301
 302         if (copy_from_user(&init_block, uptr, sizeof(init_block))) {
 303                 vmci_ioctl_err("error reading init block\n");
 304                 return -EFAULT;
 305         }
 306
 307         mutex_lock(&vmci_host_dev->lock);
 308
 309         if (vmci_host_dev->ct_type != VMCIOBJ_NOT_SET) {
 310                 vmci_ioctl_err("received VMCI init on initialized handle\n");
 311                 retval = -EINVAL;
 312                 goto out;
 313         }
 314
 315         if (init_block.flags & ~VMCI_PRIVILEGE_FLAG_RESTRICTED) {
 316                 vmci_ioctl_err("unsupported VMCI restriction flag\n");
 317                 retval = -EINVAL;
 318                 goto out;
 319         }
 320
 321         cred = get_current_cred();
 322         vmci_host_dev->context = vmci_ctx_create(init_block.cid,
 323                                                  init_block.flags, 0,
 324                                                  vmci_host_dev->user_version,
 325                                                  cred);
 326         put_cred(cred);
 327         if (IS_ERR(vmci_host_dev->context)) {
 328                 retval = PTR_ERR(vmci_host_dev->context);
 329                 vmci_ioctl_err("error initializing context\n");
 330                 goto out;
 331         }
 332
 333         /*
 334          * Copy cid to userlevel, we do this to allow the VMX
 335          * to enforce its policy on cid generation.
 336          */
 337         init_block.cid = vmci_ctx_get_id(vmci_host_dev->context);
 338         if (copy_to_user(uptr, &init_block, sizeof(init_block))) {
 339                 vmci_ctx_destroy(vmci_host_dev->context);
 340                 vmci_host_dev->context = NULL;
 341                 vmci_ioctl_err("error writing init block\n");
 342                 retval = -EFAULT;
 343                 goto out;
 344         }
 345
 346         vmci_host_dev->ct_type = VMCIOBJ_CONTEXT;
 347         atomic_inc(&vmci_host_active_users);
 348
 349         retval = 0;
 350
 351 out:
 352         mutex_unlock(&vmci_host_dev->lock);
 353         return retval;
 354 }
 355
 356 static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev,
 357                                       const char *ioctl_name,
 358                                       void __user *uptr)
 359 {
 360         struct vmci_datagram_snd_rcv_info send_info;
 361         struct vmci_datagram *dg = NULL;
 362         u32 cid;
 363
 364         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 365                 vmci_ioctl_err("only valid for contexts\n");
 366                 return -EINVAL;
 367         }
 368
 369         if (copy_from_user(&send_info, uptr, sizeof(send_info)))
 370                 return -EFAULT;
 371
 372         if (send_info.len > VMCI_MAX_DG_SIZE) {
 373                 vmci_ioctl_err("datagram is too big (size=%d)\n",
 374                                send_info.len);
 375                 return -EINVAL;
 376         }
 377
 378         if (send_info.len < sizeof(*dg)) {
 379                 vmci_ioctl_err("datagram is too small (size=%d)\n",
 380                                send_info.len);
 381                 return -EINVAL;
 382         }
 383
 384         dg = memdup_user((void __user *)(uintptr_t)send_info.addr,
 385                          send_info.len);
 386         if (IS_ERR(dg)) {
 387                 vmci_ioctl_err(
 388                         "cannot allocate memory to dispatch datagram\n");
 389                 return PTR_ERR(dg);
 390         }
 391
 392         if (VMCI_DG_SIZE(dg) != send_info.len) {
 393                 vmci_ioctl_err("datagram size mismatch\n");
 394                 kfree(dg);
 395                 return -EINVAL;
 396         }
 397
 398         pr_devel("Datagram dst (handle=0x%x:0x%x) src (handle=0x%x:0x%x), payload (size=%llu bytes)\n",
 399                  dg->dst.context, dg->dst.resource,
 400                  dg->src.context, dg->src.resource,
 401                  (unsigned long long)dg->payload_size);
 402
 403         /* Get source context id. */
 404         cid = vmci_ctx_get_id(vmci_host_dev->context);
 405         send_info.result = vmci_datagram_dispatch(cid, dg, true);
 406         kfree(dg);
 407
 408         return copy_to_user(uptr, &send_info, sizeof(send_info)) ? -EFAULT : 0;
 409 }
 410
 411 static int vmci_host_do_receive_datagram(struct vmci_host_dev *vmci_host_dev,
 412                                          const char *ioctl_name,
 413                                          void __user *uptr)
 414 {
 415         struct vmci_datagram_snd_rcv_info recv_info;
 416         struct vmci_datagram *dg = NULL;
 417         int retval;
 418         size_t size;
 419
 420         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 421                 vmci_ioctl_err("only valid for contexts\n");
 422                 return -EINVAL;
 423         }
 424
 425         if (copy_from_user(&recv_info, uptr, sizeof(recv_info)))
 426                 return -EFAULT;
 427
 428         size = recv_info.len;
 429         recv_info.result = vmci_ctx_dequeue_datagram(vmci_host_dev->context,
 430                                                      &size, &dg);
 431
 432         if (recv_info.result >= VMCI_SUCCESS) {
 433                 void __user *ubuf = (void __user *)(uintptr_t)recv_info.addr;
 434                 retval = copy_to_user(ubuf, dg, VMCI_DG_SIZE(dg));
 435                 kfree(dg);
 436                 if (retval != 0)
 437                         return -EFAULT;
 438         }
 439
 440         return copy_to_user(uptr, &recv_info, sizeof(recv_info)) ? -EFAULT : 0;
 441 }
 442
 443 static int vmci_host_do_alloc_queuepair(struct vmci_host_dev *vmci_host_dev,
 444                                         const char *ioctl_name,
 445                                         void __user *uptr)
 446 {
 447         struct vmci_handle handle;
 448         int vmci_status;
 449         int __user *retptr;
 450         u32 cid;
 451
 452         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 453                 vmci_ioctl_err("only valid for contexts\n");
 454                 return -EINVAL;
 455         }
 456
 457         cid = vmci_ctx_get_id(vmci_host_dev->context);
 458
 459         if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 460                 struct vmci_qp_alloc_info_vmvm alloc_info;
 461                 struct vmci_qp_alloc_info_vmvm __user *info = uptr;
 462
 463                 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
 464                         return -EFAULT;
 465
 466                 handle = alloc_info.handle;
 467                 retptr = &info->result;
 468
 469                 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
 470                                                 alloc_info.peer,
 471                                                 alloc_info.flags,
 472                                                 VMCI_NO_PRIVILEGE_FLAGS,
 473                                                 alloc_info.produce_size,
 474                                                 alloc_info.consume_size,
 475                                                 NULL,
 476                                                 vmci_host_dev->context);
 477
 478                 if (vmci_status == VMCI_SUCCESS)
 479                         vmci_status = VMCI_SUCCESS_QUEUEPAIR_CREATE;
 480         } else {
 481                 struct vmci_qp_alloc_info alloc_info;
 482                 struct vmci_qp_alloc_info __user *info = uptr;
 483                 struct vmci_qp_page_store page_store;
 484
 485                 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
 486                         return -EFAULT;
 487
 488                 handle = alloc_info.handle;
 489                 retptr = &info->result;
 490
 491                 page_store.pages = alloc_info.ppn_va;
 492                 page_store.len = alloc_info.num_ppns;
 493
 494                 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
 495                                                 alloc_info.peer,
 496                                                 alloc_info.flags,
 497                                                 VMCI_NO_PRIVILEGE_FLAGS,
 498                                                 alloc_info.produce_size,
 499                                                 alloc_info.consume_size,
 500                                                 &page_store,
 501                                                 vmci_host_dev->context);
 502         }
 503
 504         if (put_user(vmci_status, retptr)) {
 505                 if (vmci_status >= VMCI_SUCCESS) {
 506                         vmci_status = vmci_qp_broker_detach(handle,
 507                                                         vmci_host_dev->context);
 508                 }
 509                 return -EFAULT;
 510         }
 511
 512         return 0;
 513 }
 514
 515 static int vmci_host_do_queuepair_setva(struct vmci_host_dev *vmci_host_dev,
 516                                         const char *ioctl_name,
 517                                         void __user *uptr)
 518 {
 519         struct vmci_qp_set_va_info set_va_info;
 520         struct vmci_qp_set_va_info __user *info = uptr;
 521         s32 result;
 522
 523         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 524                 vmci_ioctl_err("only valid for contexts\n");
 525                 return -EINVAL;
 526         }
 527
 528         if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 529                 vmci_ioctl_err("is not allowed\n");
 530                 return -EINVAL;
 531         }
 532
 533         if (copy_from_user(&set_va_info, uptr, sizeof(set_va_info)))
 534                 return -EFAULT;
 535
 536         if (set_va_info.va) {
 537                 /*
 538                  * VMX is passing down a new VA for the queue
 539                  * pair mapping.
 540                  */
 541                 result = vmci_qp_broker_map(set_va_info.handle,
 542                                             vmci_host_dev->context,
 543                                             set_va_info.va);
 544         } else {
 545                 /*
 546                  * The queue pair is about to be unmapped by
 547                  * the VMX.
 548                  */
 549                 result = vmci_qp_broker_unmap(set_va_info.handle,
 550                                          vmci_host_dev->context, 0);
 551         }
 552
 553         return put_user(result, &info->result) ? -EFAULT : 0;
 554 }
 555
 556 static int vmci_host_do_queuepair_setpf(struct vmci_host_dev *vmci_host_dev,
 557                                         const char *ioctl_name,
 558                                         void __user *uptr)
 559 {
 560         struct vmci_qp_page_file_info page_file_info;
 561         struct vmci_qp_page_file_info __user *info = uptr;
 562         s32 result;
 563
 564         if (vmci_host_dev->user_version < VMCI_VERSION_HOSTQP ||
 565             vmci_host_dev->user_version >= VMCI_VERSION_NOVMVM) {
 566                 vmci_ioctl_err("not supported on this VMX (version=%d)\n",
 567                                vmci_host_dev->user_version);
 568                 return -EINVAL;
 569         }
 570
 571         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 572                 vmci_ioctl_err("only valid for contexts\n");
 573                 return -EINVAL;
 574         }
 575
 576         if (copy_from_user(&page_file_info, uptr, sizeof(*info)))
 577                 return -EFAULT;
 578
 579         /*
 580          * Communicate success pre-emptively to the caller.  Note that the
 581          * basic premise is that it is incumbent upon the caller not to look at
 582          * the info.result field until after the ioctl() returns.  And then,
 583          * only if the ioctl() result indicates no error.  We send up the
 584          * SUCCESS status before calling SetPageStore() store because failing
 585          * to copy up the result code means unwinding the SetPageStore().
 586          *
 587          * It turns out the logic to unwind a SetPageStore() opens a can of
 588          * worms.  For example, if a host had created the queue_pair and a
 589          * guest attaches and SetPageStore() is successful but writing success
 590          * fails, then ... the host has to be stopped from writing (anymore)
 591          * data into the queue_pair.  That means an additional test in the
 592          * VMCI_Enqueue() code path.  Ugh.
 593          */
 594
 595         if (put_user(VMCI_SUCCESS, &info->result)) {
 596                 /*
 597                  * In this case, we can't write a result field of the
 598                  * caller's info block.  So, we don't even try to
 599                  * SetPageStore().
 600                  */
 601                 return -EFAULT;
 602         }
 603
 604         result = vmci_qp_broker_set_page_store(page_file_info.handle,
 605                                                 page_file_info.produce_va,
 606                                                 page_file_info.consume_va,
 607                                                 vmci_host_dev->context);
 608         if (result < VMCI_SUCCESS) {
 609                 if (put_user(result, &info->result)) {
 610                         /*
 611                          * Note that in this case the SetPageStore()
 612                          * call failed but we were unable to
 613                          * communicate that to the caller (because the
 614                          * copy_to_user() call failed).  So, if we
 615                          * simply return an error (in this case
 616                          * -EFAULT) then the caller will know that the
 617                          *  SetPageStore failed even though we couldn't
 618                          *  put the result code in the result field and
 619                          *  indicate exactly why it failed.
 620                          *
 621                          * That says nothing about the issue where we
 622                          * were once able to write to the caller's info
 623                          * memory and now can't.  Something more
 624                          * serious is probably going on than the fact
 625                          * that SetPageStore() didn't work.
 626                          */
 627                         return -EFAULT;
 628                 }
 629         }
 630
 631         return 0;
 632 }
 633
 634 static int vmci_host_do_qp_detach(struct vmci_host_dev *vmci_host_dev,
 635                                   const char *ioctl_name,
 636                                   void __user *uptr)
 637 {
 638         struct vmci_qp_dtch_info detach_info;
 639         struct vmci_qp_dtch_info __user *info = uptr;
 640         s32 result;
 641
 642         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 643                 vmci_ioctl_err("only valid for contexts\n");
 644                 return -EINVAL;
 645         }
 646
 647         if (copy_from_user(&detach_info, uptr, sizeof(detach_info)))
 648                 return -EFAULT;
 649
 650         result = vmci_qp_broker_detach(detach_info.handle,
 651                                        vmci_host_dev->context);
 652         if (result == VMCI_SUCCESS &&
 653             vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 654                 result = VMCI_SUCCESS_LAST_DETACH;
 655         }
 656
 657         return put_user(result, &info->result) ? -EFAULT : 0;
 658 }
 659
 660 static int vmci_host_do_ctx_add_notify(struct vmci_host_dev *vmci_host_dev,
 661                                        const char *ioctl_name,
 662                                        void __user *uptr)
 663 {
 664         struct vmci_ctx_info ar_info;
 665         struct vmci_ctx_info __user *info = uptr;
 666         s32 result;
 667         u32 cid;
 668
 669         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 670                 vmci_ioctl_err("only valid for contexts\n");
 671                 return -EINVAL;
 672         }
 673
 674         if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
 675                 return -EFAULT;
 676
 677         cid = vmci_ctx_get_id(vmci_host_dev->context);
 678         result = vmci_ctx_add_notification(cid, ar_info.remote_cid);
 679
 680         return put_user(result, &info->result) ? -EFAULT : 0;
 681 }
 682
 683 static int vmci_host_do_ctx_remove_notify(struct vmci_host_dev *vmci_host_dev,
 684                                           const char *ioctl_name,
 685                                           void __user *uptr)
 686 {
 687         struct vmci_ctx_info ar_info;
 688         struct vmci_ctx_info __user *info = uptr;
 689         u32 cid;
 690         int result;
 691
 692         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 693                 vmci_ioctl_err("only valid for contexts\n");
 694                 return -EINVAL;
 695         }
 696
 697         if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
 698                 return -EFAULT;
 699
 700         cid = vmci_ctx_get_id(vmci_host_dev->context);
 701         result = vmci_ctx_remove_notification(cid,
 702                                               ar_info.remote_cid);
 703
 704         return put_user(result, &info->result) ? -EFAULT : 0;
 705 }
 706
 707 static int vmci_host_do_ctx_get_cpt_state(struct vmci_host_dev *vmci_host_dev,
 708                                           const char *ioctl_name,
 709                                           void __user *uptr)
 710 {
 711         struct vmci_ctx_chkpt_buf_info get_info;
 712         u32 cid;
 713         void *cpt_buf;
 714         int retval;
 715
 716         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 717                 vmci_ioctl_err("only valid for contexts\n");
 718                 return -EINVAL;
 719         }
 720
 721         if (copy_from_user(&get_info, uptr, sizeof(get_info)))
 722                 return -EFAULT;
 723
 724         cid = vmci_ctx_get_id(vmci_host_dev->context);
 725         get_info.result = vmci_ctx_get_chkpt_state(cid, get_info.cpt_type,
 726                                                 &get_info.buf_size, &cpt_buf);
 727         if (get_info.result == VMCI_SUCCESS && get_info.buf_size) {
 728                 void __user *ubuf = (void __user *)(uintptr_t)get_info.cpt_buf;
 729                 retval = copy_to_user(ubuf, cpt_buf, get_info.buf_size);
 730                 kfree(cpt_buf);
 731
 732                 if (retval)
 733                         return -EFAULT;
 734         }
 735
 736         return copy_to_user(uptr, &get_info, sizeof(get_info)) ? -EFAULT : 0;
 737 }
 738
 739 static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,
 740                                           const char *ioctl_name,
 741                                           void __user *uptr)
 742 {
 743         struct vmci_ctx_chkpt_buf_info set_info;
 744         u32 cid;
 745         void *cpt_buf;
 746         int retval;
 747
 748         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 749                 vmci_ioctl_err("only valid for contexts\n");
 750                 return -EINVAL;
 751         }
 752
 753         if (copy_from_user(&set_info, uptr, sizeof(set_info)))
 754                 return -EFAULT;
 755
 756         cpt_buf = kmalloc(set_info.buf_size, GFP_KERNEL);
 757         if (!cpt_buf) {
 758                 vmci_ioctl_err(
 759                         "cannot allocate memory to set cpt state (type=%d)\n",
 760                         set_info.cpt_type);
 761                 return -ENOMEM;
 762         }
 763
 764         if (copy_from_user(cpt_buf, (void __user *)(uintptr_t)set_info.cpt_buf,
 765                            set_info.buf_size)) {
 766                 retval = -EFAULT;
 767                 goto out;
 768         }
 769
 770         cid = vmci_ctx_get_id(vmci_host_dev->context);
 771         set_info.result = vmci_ctx_set_chkpt_state(cid, set_info.cpt_type,
 772                                                    set_info.buf_size, cpt_buf);
 773
 774         retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;
 775
 776 out:
 777         kfree(cpt_buf);
 778         return retval;
 779 }
 780
 781 static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev,
 782                                        const char *ioctl_name,
 783                                        void __user *uptr)
 784 {
 785         u32 __user *u32ptr = uptr;
 786
 787         return put_user(VMCI_HOST_CONTEXT_ID, u32ptr) ? -EFAULT : 0;
 788 }
 789
 790 static int vmci_host_do_set_notify(struct vmci_host_dev *vmci_host_dev,
 791                                    const char *ioctl_name,
 792                                    void __user *uptr)
 793 {
 794         struct vmci_set_notify_info notify_info;
 795
 796         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 797                 vmci_ioctl_err("only valid for contexts\n");
 798                 return -EINVAL;
 799         }
 800
 801         if (copy_from_user(&notify_info, uptr, sizeof(notify_info)))
 802                 return -EFAULT;
 803
 804         if (notify_info.notify_uva) {
 805                 notify_info.result =
 806                         vmci_host_setup_notify(vmci_host_dev->context,
 807                                                notify_info.notify_uva);
 808         } else {
 809                 vmci_ctx_unset_notify(vmci_host_dev->context);
 810                 notify_info.result = VMCI_SUCCESS;
 811         }
 812
 813         return copy_to_user(uptr, &notify_info, sizeof(notify_info)) ?
 814                 -EFAULT : 0;
 815 }
 816
 817 static int vmci_host_do_notify_resource(struct vmci_host_dev *vmci_host_dev,
 818                                         const char *ioctl_name,
 819                                         void __user *uptr)
 820 {
 821         struct vmci_dbell_notify_resource_info info;
 822         u32 cid;
 823
 824         if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
 825                 vmci_ioctl_err("invalid for current VMX versions\n");
 826                 return -EINVAL;
 827         }
 828
 829         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 830                 vmci_ioctl_err("only valid for contexts\n");
 831                 return -EINVAL;
 832         }
 833
 834         if (copy_from_user(&info, uptr, sizeof(info)))
 835                 return -EFAULT;
 836
 837         cid = vmci_ctx_get_id(vmci_host_dev->context);
 838
 839         switch (info.action) {
 840         case VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY:
 841                 if (info.resource == VMCI_NOTIFY_RESOURCE_DOOR_BELL) {
 842                         u32 flags = VMCI_NO_PRIVILEGE_FLAGS;
 843                         info.result = vmci_ctx_notify_dbell(cid, info.handle,
 844                                                             flags);
 845                 } else {
 846                         info.result = VMCI_ERROR_UNAVAILABLE;
 847                 }
 848                 break;
 849
 850         case VMCI_NOTIFY_RESOURCE_ACTION_CREATE:
 851                 info.result = vmci_ctx_dbell_create(cid, info.handle);
 852                 break;
 853
 854         case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY:
 855                 info.result = vmci_ctx_dbell_destroy(cid, info.handle);
 856                 break;
 857
 858         default:
 859                 vmci_ioctl_err("got unknown action (action=%d)\n",
 860                                info.action);
 861                 info.result = VMCI_ERROR_INVALID_ARGS;
 862         }
 863
 864         return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
 865 }
 866
 867 static int vmci_host_do_recv_notifications(struct vmci_host_dev *vmci_host_dev,
 868                                            const char *ioctl_name,
 869                                            void __user *uptr)
 870 {
 871         struct vmci_ctx_notify_recv_info info;
 872         struct vmci_handle_arr *db_handle_array;
 873         struct vmci_handle_arr *qp_handle_array;
 874         void __user *ubuf;
 875         u32 cid;
 876         int retval = 0;
 877
 878         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 879                 vmci_ioctl_err("only valid for contexts\n");
 880                 return -EINVAL;
 881         }
 882
 883         if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
 884                 vmci_ioctl_err("not supported for the current vmx version\n");
 885                 return -EINVAL;
 886         }
 887
 888         if (copy_from_user(&info, uptr, sizeof(info)))
 889                 return -EFAULT;
 890
 891         if ((info.db_handle_buf_size && !info.db_handle_buf_uva) ||
 892             (info.qp_handle_buf_size && !info.qp_handle_buf_uva)) {
 893                 return -EINVAL;
 894         }
 895
 896         cid = vmci_ctx_get_id(vmci_host_dev->context);
 897
 898         info.result = vmci_ctx_rcv_notifications_get(cid,
 899                                 &db_handle_array, &qp_handle_array);
 900         if (info.result != VMCI_SUCCESS)
 901                 return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
 902
 903         ubuf = (void __user *)(uintptr_t)info.db_handle_buf_uva;
 904         info.result = drv_cp_harray_to_user(ubuf, &info.db_handle_buf_size,
 905                                             db_handle_array, &retval);
 906         if (info.result == VMCI_SUCCESS && !retval) {
 907                 ubuf = (void __user *)(uintptr_t)info.qp_handle_buf_uva;
 908                 info.result = drv_cp_harray_to_user(ubuf,
 909                                                     &info.qp_handle_buf_size,
 910                                                     qp_handle_array, &retval);
 911         }
 912
 913         if (!retval && copy_to_user(uptr, &info, sizeof(info)))
 914                 retval = -EFAULT;
 915
 916         vmci_ctx_rcv_notifications_release(cid,
 917                                 db_handle_array, qp_handle_array,
 918                                 info.result == VMCI_SUCCESS && !retval);
 919
 920         return retval;
 921 }
 922
 923 static long vmci_host_unlocked_ioctl(struct file *filp,
 924                                      unsigned int iocmd, unsigned long ioarg)
 925 {
 926 #define VMCI_DO_IOCTL(ioctl_name, ioctl_fn) do {                        \
 927                 char *name = __stringify(IOCTL_VMCI_ ## ioctl_name);    \
 928                 return vmci_host_do_ ## ioctl_fn(                       \
 929                         vmci_host_dev, name, uptr);                     \
 930         } while (0)
 931
 932         struct vmci_host_dev *vmci_host_dev = filp->private_data;
 933         void __user *uptr = (void __user *)ioarg;
 934
 935         switch (iocmd) {
 936         case IOCTL_VMCI_INIT_CONTEXT:
 937                 VMCI_DO_IOCTL(INIT_CONTEXT, init_context);
 938         case IOCTL_VMCI_DATAGRAM_SEND:
 939                 VMCI_DO_IOCTL(DATAGRAM_SEND, send_datagram);
 940         case IOCTL_VMCI_DATAGRAM_RECEIVE:
 941                 VMCI_DO_IOCTL(DATAGRAM_RECEIVE, receive_datagram);
 942         case IOCTL_VMCI_QUEUEPAIR_ALLOC:
 943                 VMCI_DO_IOCTL(QUEUEPAIR_ALLOC, alloc_queuepair);
 944         case IOCTL_VMCI_QUEUEPAIR_SETVA:
 945                 VMCI_DO_IOCTL(QUEUEPAIR_SETVA, queuepair_setva);
 946         case IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE:
 947                 VMCI_DO_IOCTL(QUEUEPAIR_SETPAGEFILE, queuepair_setpf);
 948         case IOCTL_VMCI_QUEUEPAIR_DETACH:
 949                 VMCI_DO_IOCTL(QUEUEPAIR_DETACH, qp_detach);
 950         case IOCTL_VMCI_CTX_ADD_NOTIFICATION:
 951                 VMCI_DO_IOCTL(CTX_ADD_NOTIFICATION, ctx_add_notify);
 952         case IOCTL_VMCI_CTX_REMOVE_NOTIFICATION:
 953                 VMCI_DO_IOCTL(CTX_REMOVE_NOTIFICATION, ctx_remove_notify);
 954         case IOCTL_VMCI_CTX_GET_CPT_STATE:
 955                 VMCI_DO_IOCTL(CTX_GET_CPT_STATE, ctx_get_cpt_state);
 956         case IOCTL_VMCI_CTX_SET_CPT_STATE:
 957                 VMCI_DO_IOCTL(CTX_SET_CPT_STATE, ctx_set_cpt_state);
 958         case IOCTL_VMCI_GET_CONTEXT_ID:
 959                 VMCI_DO_IOCTL(GET_CONTEXT_ID, get_context_id);
 960         case IOCTL_VMCI_SET_NOTIFY:
 961                 VMCI_DO_IOCTL(SET_NOTIFY, set_notify);
 962         case IOCTL_VMCI_NOTIFY_RESOURCE:
 963                 VMCI_DO_IOCTL(NOTIFY_RESOURCE, notify_resource);
 964         case IOCTL_VMCI_NOTIFICATIONS_RECEIVE:
 965                 VMCI_DO_IOCTL(NOTIFICATIONS_RECEIVE, recv_notifications);
 966
 967         case IOCTL_VMCI_VERSION:
 968         case IOCTL_VMCI_VERSION2:
 969                 return vmci_host_get_version(vmci_host_dev, iocmd, uptr);
 970
 971         default:
 972                 pr_devel("%s: Unknown ioctl (iocmd=%d)\n", __func__, iocmd);
 973                 return -EINVAL;
 974         }
 975
 976 #undef VMCI_DO_IOCTL
 977 }
 978
 979 static const struct file_operations vmuser_fops = {
 980         .owner          = THIS_MODULE,
 981         .open           = vmci_host_open,
 982         .release        = vmci_host_close,
 983         .poll           = vmci_host_poll,
 984         .unlocked_ioctl = vmci_host_unlocked_ioctl,
 985         .compat_ioctl   = vmci_host_unlocked_ioctl,
 986 };
 987
 988 static struct miscdevice vmci_host_miscdev = {
 989          .name = "vmci",
 990          .minor = MISC_DYNAMIC_MINOR,
 991          .fops = &vmuser_fops,
 992 };
 993
 994 int __init vmci_host_init(void)
 995 {
 996         int error;
 997
 998         host_context = vmci_ctx_create(VMCI_HOST_CONTEXT_ID,
 999                                         VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS,
1000                                         -1, VMCI_VERSION, NULL);
1001         if (IS_ERR(host_context)) {
1002                 error = PTR_ERR(host_context);
1003                 pr_warn("Failed to initialize VMCIContext (error%d)\n",
1004                         error);
1005                 return error;
1006         }
1007
1008         error = misc_register(&vmci_host_miscdev);
1009         if (error) {
1010                 pr_warn("Module registration error (name=%s, major=%d, minor=%d, err=%d)\n",
1011                         vmci_host_miscdev.name,
1012                         MISC_MAJOR, vmci_host_miscdev.minor,
1013                         error);
1014                 pr_warn("Unable to initialize host personality\n");
1015                 vmci_ctx_destroy(host_context);
1016                 return error;
1017         }
1018
1019         pr_info("VMCI host device registered (name=%s, major=%d, minor=%d)\n",
1020                 vmci_host_miscdev.name, MISC_MAJOR, vmci_host_miscdev.minor);
1021
1022         vmci_host_device_initialized = true;
1023         return 0;
1024 }
1025
1026 void __exit vmci_host_exit(void)
1027 {
1028         vmci_host_device_initialized = false;
1029
1030         misc_deregister(&vmci_host_miscdev);
1031         vmci_ctx_destroy(host_context);
1032         vmci_qp_broker_exit();
1033
1034         pr_debug("VMCI host driver module unloaded\n");
1035 }