drivers/misc/vmw_vmci/vmci_host.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VMware VMCI Driver
   4  *
   5  * Copyright (C) 2012 VMware, Inc. All rights reserved.
   6  */
   7
   8 #include <linux/vmw_vmci_defs.h>
   9 #include <linux/vmw_vmci_api.h>
  10 #include <linux/miscdevice.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/highmem.h>
  13 #include <linux/atomic.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/mutex.h>
  17 #include <linux/sched.h>
  18 #include <linux/cred.h>
  19 #include <linux/slab.h>
  20 #include <linux/file.h>
  21 #include <linux/init.h>
  22 #include <linux/poll.h>
  23 #include <linux/pci.h>
  24 #include <linux/smp.h>
  25 #include <linux/fs.h>
  26 #include <linux/io.h>
  27
  28 #include "vmci_handle_array.h"
  29 #include "vmci_queue_pair.h"
  30 #include "vmci_datagram.h"
  31 #include "vmci_doorbell.h"
  32 #include "vmci_resource.h"
  33 #include "vmci_context.h"
  34 #include "vmci_driver.h"
  35 #include "vmci_event.h"
  36
  37 #define VMCI_UTIL_NUM_RESOURCES 1
  38
  39 enum {
  40         VMCI_NOTIFY_RESOURCE_QUEUE_PAIR = 0,
  41         VMCI_NOTIFY_RESOURCE_DOOR_BELL = 1,
  42 };
  43
  44 enum {
  45         VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY = 0,
  46         VMCI_NOTIFY_RESOURCE_ACTION_CREATE = 1,
  47         VMCI_NOTIFY_RESOURCE_ACTION_DESTROY = 2,
  48 };
  49
  50 /*
  51  * VMCI driver initialization. This block can also be used to
  52  * pass initial group membership etc.
  53  */
  54 struct vmci_init_blk {
  55         u32 cid;
  56         u32 flags;
  57 };
  58
  59 /* VMCIqueue_pairAllocInfo_VMToVM */
  60 struct vmci_qp_alloc_info_vmvm {
  61         struct vmci_handle handle;
  62         u32 peer;
  63         u32 flags;
  64         u64 produce_size;
  65         u64 consume_size;
  66         u64 produce_page_file;    /* User VA. */
  67         u64 consume_page_file;    /* User VA. */
  68         u64 produce_page_file_size;  /* Size of the file name array. */
  69         u64 consume_page_file_size;  /* Size of the file name array. */
  70         s32 result;
  71         u32 _pad;
  72 };
  73
  74 /* VMCISetNotifyInfo: Used to pass notify flag's address to the host driver. */
  75 struct vmci_set_notify_info {
  76         u64 notify_uva;
  77         s32 result;
  78         u32 _pad;
  79 };
  80
  81 /*
  82  * Per-instance host state
  83  */
  84 struct vmci_host_dev {
  85         struct vmci_ctx *context;
  86         int user_version;
  87         enum vmci_obj_type ct_type;
  88         struct mutex lock;  /* Mutex lock for vmci context access */
  89 };
  90
  91 static struct vmci_ctx *host_context;
  92 static bool vmci_host_device_initialized;
  93 static atomic_t vmci_host_active_users = ATOMIC_INIT(0);
  94
  95 /*
  96  * Determines whether the VMCI host personality is
  97  * available. Since the core functionality of the host driver is
  98  * always present, all guests could possibly use the host
  99  * personality. However, to minimize the deviation from the
 100  * pre-unified driver state of affairs, we only consider the host
 101  * device active if there is no active guest device or if there
 102  * are VMX'en with active VMCI contexts using the host device.
 103  */
 104 bool vmci_host_code_active(void)
 105 {
 106         return vmci_host_device_initialized &&
 107             (!vmci_guest_code_active() ||
 108              atomic_read(&vmci_host_active_users) > 0);
 109 }
 110
 111 int vmci_host_users(void)
 112 {
 113         return atomic_read(&vmci_host_active_users);
 114 }
 115
 116 /*
 117  * Called on open of /dev/vmci.
 118  */
 119 static int vmci_host_open(struct inode *inode, struct file *filp)
 120 {
 121         struct vmci_host_dev *vmci_host_dev;
 122
 123         vmci_host_dev = kzalloc(sizeof(struct vmci_host_dev), GFP_KERNEL);
 124         if (vmci_host_dev == NULL)
 125                 return -ENOMEM;
 126
 127         vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
 128         mutex_init(&vmci_host_dev->lock);
 129         filp->private_data = vmci_host_dev;
 130
 131         return 0;
 132 }
 133
 134 /*
 135  * Called on close of /dev/vmci, most often when the process
 136  * exits.
 137  */
 138 static int vmci_host_close(struct inode *inode, struct file *filp)
 139 {
 140         struct vmci_host_dev *vmci_host_dev = filp->private_data;
 141
 142         if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
 143                 vmci_ctx_destroy(vmci_host_dev->context);
 144                 vmci_host_dev->context = NULL;
 145
 146                 /*
 147                  * The number of active contexts is used to track whether any
 148                  * VMX'en are using the host personality. It is incremented when
 149                  * a context is created through the IOCTL_VMCI_INIT_CONTEXT
 150                  * ioctl.
 151                  */
 152                 atomic_dec(&vmci_host_active_users);
 153         }
 154         vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
 155
 156         kfree(vmci_host_dev);
 157         filp->private_data = NULL;
 158         return 0;
 159 }
 160
 161 /*
 162  * This is used to wake up the VMX when a VMCI call arrives, or
 163  * to wake up select() or poll() at the next clock tick.
 164  */
 165 static __poll_t vmci_host_poll(struct file *filp, poll_table *wait)
 166 {
 167         struct vmci_host_dev *vmci_host_dev = filp->private_data;
 168         struct vmci_ctx *context;
 169         __poll_t mask = 0;
 170
 171         if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
 172                 /*
 173                  * Read context only if ct_type == VMCIOBJ_CONTEXT to make
 174                  * sure that context is initialized
 175                  */
 176                 context = vmci_host_dev->context;
 177
 178                 /* Check for VMCI calls to this VM context. */
 179                 if (wait)
 180                         poll_wait(filp, &context->host_context.wait_queue,
 181                                   wait);
 182
 183                 spin_lock(&context->lock);
 184                 if (context->pending_datagrams > 0 ||
 185                     vmci_handle_arr_get_size(
 186                                 context->pending_doorbell_array) > 0) {
 187                         mask = EPOLLIN;
 188                 }
 189                 spin_unlock(&context->lock);
 190         }
 191         return mask;
 192 }
 193
 194 /*
 195  * Copies the handles of a handle array into a user buffer, and
 196  * returns the new length in userBufferSize. If the copy to the
 197  * user buffer fails, the functions still returns VMCI_SUCCESS,
 198  * but retval != 0.
 199  */
 200 static int drv_cp_harray_to_user(void __user *user_buf_uva,
 201                                  u64 *user_buf_size,
 202                                  struct vmci_handle_arr *handle_array,
 203                                  int *retval)
 204 {
 205         u32 array_size = 0;
 206         struct vmci_handle *handles;
 207
 208         if (handle_array)
 209                 array_size = vmci_handle_arr_get_size(handle_array);
 210
 211         if (array_size * sizeof(*handles) > *user_buf_size)
 212                 return VMCI_ERROR_MORE_DATA;
 213
 214         *user_buf_size = array_size * sizeof(*handles);
 215         if (*user_buf_size)
 216                 *retval = copy_to_user(user_buf_uva,
 217                                        vmci_handle_arr_get_handles
 218                                        (handle_array), *user_buf_size);
 219
 220         return VMCI_SUCCESS;
 221 }
 222
 223 /*
 224  * Sets up a given context for notify to work. Maps the notify
 225  * boolean in user VA into kernel space.
 226  */
 227 static int vmci_host_setup_notify(struct vmci_ctx *context,
 228                                   unsigned long uva)
 229 {
 230         int retval;
 231
 232         if (context->notify_page) {
 233                 pr_devel("%s: Notify mechanism is already set up\n", __func__);
 234                 return VMCI_ERROR_DUPLICATE_ENTRY;
 235         }
 236
 237         /*
 238          * We are using 'bool' internally, but let's make sure we explicit
 239          * about the size.
 240          */
 241         BUILD_BUG_ON(sizeof(bool) != sizeof(u8));
 242
 243         /*
 244          * Lock physical page backing a given user VA.
 245          */
 246         retval = get_user_pages_fast(uva, 1, FOLL_WRITE, &context->notify_page);
 247         if (retval != 1) {
 248                 context->notify_page = NULL;
 249                 return VMCI_ERROR_GENERIC;
 250         }
 251         if (context->notify_page == NULL)
 252                 return VMCI_ERROR_UNAVAILABLE;
 253
 254         /*
 255          * Map the locked page and set up notify pointer.
 256          */
 257         context->notify = kmap(context->notify_page) + (uva & (PAGE_SIZE - 1));
 258         vmci_ctx_check_signal_notify(context);
 259
 260         return VMCI_SUCCESS;
 261 }
 262
 263 static int vmci_host_get_version(struct vmci_host_dev *vmci_host_dev,
 264                                  unsigned int cmd, void __user *uptr)
 265 {
 266         if (cmd == IOCTL_VMCI_VERSION2) {
 267                 int __user *vptr = uptr;
 268                 if (get_user(vmci_host_dev->user_version, vptr))
 269                         return -EFAULT;
 270         }
 271
 272         /*
 273          * The basic logic here is:
 274          *
 275          * If the user sends in a version of 0 tell it our version.
 276          * If the user didn't send in a version, tell it our version.
 277          * If the user sent in an old version, tell it -its- version.
 278          * If the user sent in an newer version, tell it our version.
 279          *
 280          * The rationale behind telling the caller its version is that
 281          * Workstation 6.5 required that VMX and VMCI kernel module were
 282          * version sync'd.  All new VMX users will be programmed to
 283          * handle the VMCI kernel module version.
 284          */
 285
 286         if (vmci_host_dev->user_version > 0 &&
 287             vmci_host_dev->user_version < VMCI_VERSION_HOSTQP) {
 288                 return vmci_host_dev->user_version;
 289         }
 290
 291         return VMCI_VERSION;
 292 }
 293
 294 #define vmci_ioctl_err(fmt, ...)        \
 295         pr_devel("%s: " fmt, ioctl_name, ##__VA_ARGS__)
 296
 297 static int vmci_host_do_init_context(struct vmci_host_dev *vmci_host_dev,
 298                                      const char *ioctl_name,
 299                                      void __user *uptr)
 300 {
 301         struct vmci_init_blk init_block;
 302         const struct cred *cred;
 303         int retval;
 304
 305         if (copy_from_user(&init_block, uptr, sizeof(init_block))) {
 306                 vmci_ioctl_err("error reading init block\n");
 307                 return -EFAULT;
 308         }
 309
 310         mutex_lock(&vmci_host_dev->lock);
 311
 312         if (vmci_host_dev->ct_type != VMCIOBJ_NOT_SET) {
 313                 vmci_ioctl_err("received VMCI init on initialized handle\n");
 314                 retval = -EINVAL;
 315                 goto out;
 316         }
 317
 318         if (init_block.flags & ~VMCI_PRIVILEGE_FLAG_RESTRICTED) {
 319                 vmci_ioctl_err("unsupported VMCI restriction flag\n");
 320                 retval = -EINVAL;
 321                 goto out;
 322         }
 323
 324         cred = get_current_cred();
 325         vmci_host_dev->context = vmci_ctx_create(init_block.cid,
 326                                                  init_block.flags, 0,
 327                                                  vmci_host_dev->user_version,
 328                                                  cred);
 329         put_cred(cred);
 330         if (IS_ERR(vmci_host_dev->context)) {
 331                 retval = PTR_ERR(vmci_host_dev->context);
 332                 vmci_ioctl_err("error initializing context\n");
 333                 goto out;
 334         }
 335
 336         /*
 337          * Copy cid to userlevel, we do this to allow the VMX
 338          * to enforce its policy on cid generation.
 339          */
 340         init_block.cid = vmci_ctx_get_id(vmci_host_dev->context);
 341         if (copy_to_user(uptr, &init_block, sizeof(init_block))) {
 342                 vmci_ctx_destroy(vmci_host_dev->context);
 343                 vmci_host_dev->context = NULL;
 344                 vmci_ioctl_err("error writing init block\n");
 345                 retval = -EFAULT;
 346                 goto out;
 347         }
 348
 349         vmci_host_dev->ct_type = VMCIOBJ_CONTEXT;
 350         atomic_inc(&vmci_host_active_users);
 351
 352         vmci_call_vsock_callback(true);
 353
 354         retval = 0;
 355
 356 out:
 357         mutex_unlock(&vmci_host_dev->lock);
 358         return retval;
 359 }
 360
 361 static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev,
 362                                       const char *ioctl_name,
 363                                       void __user *uptr)
 364 {
 365         struct vmci_datagram_snd_rcv_info send_info;
 366         struct vmci_datagram *dg = NULL;
 367         u32 cid;
 368
 369         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 370                 vmci_ioctl_err("only valid for contexts\n");
 371                 return -EINVAL;
 372         }
 373
 374         if (copy_from_user(&send_info, uptr, sizeof(send_info)))
 375                 return -EFAULT;
 376
 377         if (send_info.len > VMCI_MAX_DG_SIZE) {
 378                 vmci_ioctl_err("datagram is too big (size=%d)\n",
 379                                send_info.len);
 380                 return -EINVAL;
 381         }
 382
 383         if (send_info.len < sizeof(*dg)) {
 384                 vmci_ioctl_err("datagram is too small (size=%d)\n",
 385                                send_info.len);
 386                 return -EINVAL;
 387         }
 388
 389         dg = memdup_user((void __user *)(uintptr_t)send_info.addr,
 390                          send_info.len);
 391         if (IS_ERR(dg)) {
 392                 vmci_ioctl_err(
 393                         "cannot allocate memory to dispatch datagram\n");
 394                 return PTR_ERR(dg);
 395         }
 396
 397         if (VMCI_DG_SIZE(dg) != send_info.len) {
 398                 vmci_ioctl_err("datagram size mismatch\n");
 399                 kfree(dg);
 400                 return -EINVAL;
 401         }
 402
 403         pr_devel("Datagram dst (handle=0x%x:0x%x) src (handle=0x%x:0x%x), payload (size=%llu bytes)\n",
 404                  dg->dst.context, dg->dst.resource,
 405                  dg->src.context, dg->src.resource,
 406                  (unsigned long long)dg->payload_size);
 407
 408         /* Get source context id. */
 409         cid = vmci_ctx_get_id(vmci_host_dev->context);
 410         send_info.result = vmci_datagram_dispatch(cid, dg, true);
 411         kfree(dg);
 412
 413         return copy_to_user(uptr, &send_info, sizeof(send_info)) ? -EFAULT : 0;
 414 }
 415
 416 static int vmci_host_do_receive_datagram(struct vmci_host_dev *vmci_host_dev,
 417                                          const char *ioctl_name,
 418                                          void __user *uptr)
 419 {
 420         struct vmci_datagram_snd_rcv_info recv_info;
 421         struct vmci_datagram *dg = NULL;
 422         int retval;
 423         size_t size;
 424
 425         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 426                 vmci_ioctl_err("only valid for contexts\n");
 427                 return -EINVAL;
 428         }
 429
 430         if (copy_from_user(&recv_info, uptr, sizeof(recv_info)))
 431                 return -EFAULT;
 432
 433         size = recv_info.len;
 434         recv_info.result = vmci_ctx_dequeue_datagram(vmci_host_dev->context,
 435                                                      &size, &dg);
 436
 437         if (recv_info.result >= VMCI_SUCCESS) {
 438                 void __user *ubuf = (void __user *)(uintptr_t)recv_info.addr;
 439                 retval = copy_to_user(ubuf, dg, VMCI_DG_SIZE(dg));
 440                 kfree(dg);
 441                 if (retval != 0)
 442                         return -EFAULT;
 443         }
 444
 445         return copy_to_user(uptr, &recv_info, sizeof(recv_info)) ? -EFAULT : 0;
 446 }
 447
 448 static int vmci_host_do_alloc_queuepair(struct vmci_host_dev *vmci_host_dev,
 449                                         const char *ioctl_name,
 450                                         void __user *uptr)
 451 {
 452         struct vmci_handle handle;
 453         int vmci_status;
 454         int __user *retptr;
 455
 456         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 457                 vmci_ioctl_err("only valid for contexts\n");
 458                 return -EINVAL;
 459         }
 460
 461         if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 462                 struct vmci_qp_alloc_info_vmvm alloc_info;
 463                 struct vmci_qp_alloc_info_vmvm __user *info = uptr;
 464
 465                 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
 466                         return -EFAULT;
 467
 468                 handle = alloc_info.handle;
 469                 retptr = &info->result;
 470
 471                 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
 472                                                 alloc_info.peer,
 473                                                 alloc_info.flags,
 474                                                 VMCI_NO_PRIVILEGE_FLAGS,
 475                                                 alloc_info.produce_size,
 476                                                 alloc_info.consume_size,
 477                                                 NULL,
 478                                                 vmci_host_dev->context);
 479
 480                 if (vmci_status == VMCI_SUCCESS)
 481                         vmci_status = VMCI_SUCCESS_QUEUEPAIR_CREATE;
 482         } else {
 483                 struct vmci_qp_alloc_info alloc_info;
 484                 struct vmci_qp_alloc_info __user *info = uptr;
 485                 struct vmci_qp_page_store page_store;
 486
 487                 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
 488                         return -EFAULT;
 489
 490                 handle = alloc_info.handle;
 491                 retptr = &info->result;
 492
 493                 page_store.pages = alloc_info.ppn_va;
 494                 page_store.len = alloc_info.num_ppns;
 495
 496                 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
 497                                                 alloc_info.peer,
 498                                                 alloc_info.flags,
 499                                                 VMCI_NO_PRIVILEGE_FLAGS,
 500                                                 alloc_info.produce_size,
 501                                                 alloc_info.consume_size,
 502                                                 &page_store,
 503                                                 vmci_host_dev->context);
 504         }
 505
 506         if (put_user(vmci_status, retptr)) {
 507                 if (vmci_status >= VMCI_SUCCESS) {
 508                         vmci_status = vmci_qp_broker_detach(handle,
 509                                                         vmci_host_dev->context);
 510                 }
 511                 return -EFAULT;
 512         }
 513
 514         return 0;
 515 }
 516
 517 static int vmci_host_do_queuepair_setva(struct vmci_host_dev *vmci_host_dev,
 518                                         const char *ioctl_name,
 519                                         void __user *uptr)
 520 {
 521         struct vmci_qp_set_va_info set_va_info;
 522         struct vmci_qp_set_va_info __user *info = uptr;
 523         s32 result;
 524
 525         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 526                 vmci_ioctl_err("only valid for contexts\n");
 527                 return -EINVAL;
 528         }
 529
 530         if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 531                 vmci_ioctl_err("is not allowed\n");
 532                 return -EINVAL;
 533         }
 534
 535         if (copy_from_user(&set_va_info, uptr, sizeof(set_va_info)))
 536                 return -EFAULT;
 537
 538         if (set_va_info.va) {
 539                 /*
 540                  * VMX is passing down a new VA for the queue
 541                  * pair mapping.
 542                  */
 543                 result = vmci_qp_broker_map(set_va_info.handle,
 544                                             vmci_host_dev->context,
 545                                             set_va_info.va);
 546         } else {
 547                 /*
 548                  * The queue pair is about to be unmapped by
 549                  * the VMX.
 550                  */
 551                 result = vmci_qp_broker_unmap(set_va_info.handle,
 552                                          vmci_host_dev->context, 0);
 553         }
 554
 555         return put_user(result, &info->result) ? -EFAULT : 0;
 556 }
 557
 558 static int vmci_host_do_queuepair_setpf(struct vmci_host_dev *vmci_host_dev,
 559                                         const char *ioctl_name,
 560                                         void __user *uptr)
 561 {
 562         struct vmci_qp_page_file_info page_file_info;
 563         struct vmci_qp_page_file_info __user *info = uptr;
 564         s32 result;
 565
 566         if (vmci_host_dev->user_version < VMCI_VERSION_HOSTQP ||
 567             vmci_host_dev->user_version >= VMCI_VERSION_NOVMVM) {
 568                 vmci_ioctl_err("not supported on this VMX (version=%d)\n",
 569                                vmci_host_dev->user_version);
 570                 return -EINVAL;
 571         }
 572
 573         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 574                 vmci_ioctl_err("only valid for contexts\n");
 575                 return -EINVAL;
 576         }
 577
 578         if (copy_from_user(&page_file_info, uptr, sizeof(*info)))
 579                 return -EFAULT;
 580
 581         /*
 582          * Communicate success pre-emptively to the caller.  Note that the
 583          * basic premise is that it is incumbent upon the caller not to look at
 584          * the info.result field until after the ioctl() returns.  And then,
 585          * only if the ioctl() result indicates no error.  We send up the
 586          * SUCCESS status before calling SetPageStore() store because failing
 587          * to copy up the result code means unwinding the SetPageStore().
 588          *
 589          * It turns out the logic to unwind a SetPageStore() opens a can of
 590          * worms.  For example, if a host had created the queue_pair and a
 591          * guest attaches and SetPageStore() is successful but writing success
 592          * fails, then ... the host has to be stopped from writing (anymore)
 593          * data into the queue_pair.  That means an additional test in the
 594          * VMCI_Enqueue() code path.  Ugh.
 595          */
 596
 597         if (put_user(VMCI_SUCCESS, &info->result)) {
 598                 /*
 599                  * In this case, we can't write a result field of the
 600                  * caller's info block.  So, we don't even try to
 601                  * SetPageStore().
 602                  */
 603                 return -EFAULT;
 604         }
 605
 606         result = vmci_qp_broker_set_page_store(page_file_info.handle,
 607                                                 page_file_info.produce_va,
 608                                                 page_file_info.consume_va,
 609                                                 vmci_host_dev->context);
 610         if (result < VMCI_SUCCESS) {
 611                 if (put_user(result, &info->result)) {
 612                         /*
 613                          * Note that in this case the SetPageStore()
 614                          * call failed but we were unable to
 615                          * communicate that to the caller (because the
 616                          * copy_to_user() call failed).  So, if we
 617                          * simply return an error (in this case
 618                          * -EFAULT) then the caller will know that the
 619                          *  SetPageStore failed even though we couldn't
 620                          *  put the result code in the result field and
 621                          *  indicate exactly why it failed.
 622                          *
 623                          * That says nothing about the issue where we
 624                          * were once able to write to the caller's info
 625                          * memory and now can't.  Something more
 626                          * serious is probably going on than the fact
 627                          * that SetPageStore() didn't work.
 628                          */
 629                         return -EFAULT;
 630                 }
 631         }
 632
 633         return 0;
 634 }
 635
 636 static int vmci_host_do_qp_detach(struct vmci_host_dev *vmci_host_dev,
 637                                   const char *ioctl_name,
 638                                   void __user *uptr)
 639 {
 640         struct vmci_qp_dtch_info detach_info;
 641         struct vmci_qp_dtch_info __user *info = uptr;
 642         s32 result;
 643
 644         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 645                 vmci_ioctl_err("only valid for contexts\n");
 646                 return -EINVAL;
 647         }
 648
 649         if (copy_from_user(&detach_info, uptr, sizeof(detach_info)))
 650                 return -EFAULT;
 651
 652         result = vmci_qp_broker_detach(detach_info.handle,
 653                                        vmci_host_dev->context);
 654         if (result == VMCI_SUCCESS &&
 655             vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 656                 result = VMCI_SUCCESS_LAST_DETACH;
 657         }
 658
 659         return put_user(result, &info->result) ? -EFAULT : 0;
 660 }
 661
 662 static int vmci_host_do_ctx_add_notify(struct vmci_host_dev *vmci_host_dev,
 663                                        const char *ioctl_name,
 664                                        void __user *uptr)
 665 {
 666         struct vmci_ctx_info ar_info;
 667         struct vmci_ctx_info __user *info = uptr;
 668         s32 result;
 669         u32 cid;
 670
 671         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 672                 vmci_ioctl_err("only valid for contexts\n");
 673                 return -EINVAL;
 674         }
 675
 676         if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
 677                 return -EFAULT;
 678
 679         cid = vmci_ctx_get_id(vmci_host_dev->context);
 680         result = vmci_ctx_add_notification(cid, ar_info.remote_cid);
 681
 682         return put_user(result, &info->result) ? -EFAULT : 0;
 683 }
 684
 685 static int vmci_host_do_ctx_remove_notify(struct vmci_host_dev *vmci_host_dev,
 686                                           const char *ioctl_name,
 687                                           void __user *uptr)
 688 {
 689         struct vmci_ctx_info ar_info;
 690         struct vmci_ctx_info __user *info = uptr;
 691         u32 cid;
 692         int result;
 693
 694         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 695                 vmci_ioctl_err("only valid for contexts\n");
 696                 return -EINVAL;
 697         }
 698
 699         if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
 700                 return -EFAULT;
 701
 702         cid = vmci_ctx_get_id(vmci_host_dev->context);
 703         result = vmci_ctx_remove_notification(cid,
 704                                               ar_info.remote_cid);
 705
 706         return put_user(result, &info->result) ? -EFAULT : 0;
 707 }
 708
 709 static int vmci_host_do_ctx_get_cpt_state(struct vmci_host_dev *vmci_host_dev,
 710                                           const char *ioctl_name,
 711                                           void __user *uptr)
 712 {
 713         struct vmci_ctx_chkpt_buf_info get_info;
 714         u32 cid;
 715         void *cpt_buf;
 716         int retval;
 717
 718         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 719                 vmci_ioctl_err("only valid for contexts\n");
 720                 return -EINVAL;
 721         }
 722
 723         if (copy_from_user(&get_info, uptr, sizeof(get_info)))
 724                 return -EFAULT;
 725
 726         cid = vmci_ctx_get_id(vmci_host_dev->context);
 727         get_info.result = vmci_ctx_get_chkpt_state(cid, get_info.cpt_type,
 728                                                 &get_info.buf_size, &cpt_buf);
 729         if (get_info.result == VMCI_SUCCESS && get_info.buf_size) {
 730                 void __user *ubuf = (void __user *)(uintptr_t)get_info.cpt_buf;
 731                 retval = copy_to_user(ubuf, cpt_buf, get_info.buf_size);
 732                 kfree(cpt_buf);
 733
 734                 if (retval)
 735                         return -EFAULT;
 736         }
 737
 738         return copy_to_user(uptr, &get_info, sizeof(get_info)) ? -EFAULT : 0;
 739 }
 740
 741 static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,
 742                                           const char *ioctl_name,
 743                                           void __user *uptr)
 744 {
 745         struct vmci_ctx_chkpt_buf_info set_info;
 746         u32 cid;
 747         void *cpt_buf;
 748         int retval;
 749
 750         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 751                 vmci_ioctl_err("only valid for contexts\n");
 752                 return -EINVAL;
 753         }
 754
 755         if (copy_from_user(&set_info, uptr, sizeof(set_info)))
 756                 return -EFAULT;
 757
 758         cpt_buf = memdup_user((void __user *)(uintptr_t)set_info.cpt_buf,
 759                                 set_info.buf_size);
 760         if (IS_ERR(cpt_buf))
 761                 return PTR_ERR(cpt_buf);
 762
 763         cid = vmci_ctx_get_id(vmci_host_dev->context);
 764         set_info.result = vmci_ctx_set_chkpt_state(cid, set_info.cpt_type,
 765                                                    set_info.buf_size, cpt_buf);
 766
 767         retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;
 768
 769         kfree(cpt_buf);
 770         return retval;
 771 }
 772
 773 static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev,
 774                                        const char *ioctl_name,
 775                                        void __user *uptr)
 776 {
 777         u32 __user *u32ptr = uptr;
 778
 779         return put_user(VMCI_HOST_CONTEXT_ID, u32ptr) ? -EFAULT : 0;
 780 }
 781
 782 static int vmci_host_do_set_notify(struct vmci_host_dev *vmci_host_dev,
 783                                    const char *ioctl_name,
 784                                    void __user *uptr)
 785 {
 786         struct vmci_set_notify_info notify_info;
 787
 788         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 789                 vmci_ioctl_err("only valid for contexts\n");
 790                 return -EINVAL;
 791         }
 792
 793         if (copy_from_user(&notify_info, uptr, sizeof(notify_info)))
 794                 return -EFAULT;
 795
 796         if (notify_info.notify_uva) {
 797                 notify_info.result =
 798                         vmci_host_setup_notify(vmci_host_dev->context,
 799                                                notify_info.notify_uva);
 800         } else {
 801                 vmci_ctx_unset_notify(vmci_host_dev->context);
 802                 notify_info.result = VMCI_SUCCESS;
 803         }
 804
 805         return copy_to_user(uptr, &notify_info, sizeof(notify_info)) ?
 806                 -EFAULT : 0;
 807 }
 808
 809 static int vmci_host_do_notify_resource(struct vmci_host_dev *vmci_host_dev,
 810                                         const char *ioctl_name,
 811                                         void __user *uptr)
 812 {
 813         struct vmci_dbell_notify_resource_info info;
 814         u32 cid;
 815
 816         if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
 817                 vmci_ioctl_err("invalid for current VMX versions\n");
 818                 return -EINVAL;
 819         }
 820
 821         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 822                 vmci_ioctl_err("only valid for contexts\n");
 823                 return -EINVAL;
 824         }
 825
 826         if (copy_from_user(&info, uptr, sizeof(info)))
 827                 return -EFAULT;
 828
 829         cid = vmci_ctx_get_id(vmci_host_dev->context);
 830
 831         switch (info.action) {
 832         case VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY:
 833                 if (info.resource == VMCI_NOTIFY_RESOURCE_DOOR_BELL) {
 834                         u32 flags = VMCI_NO_PRIVILEGE_FLAGS;
 835                         info.result = vmci_ctx_notify_dbell(cid, info.handle,
 836                                                             flags);
 837                 } else {
 838                         info.result = VMCI_ERROR_UNAVAILABLE;
 839                 }
 840                 break;
 841
 842         case VMCI_NOTIFY_RESOURCE_ACTION_CREATE:
 843                 info.result = vmci_ctx_dbell_create(cid, info.handle);
 844                 break;
 845
 846         case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY:
 847                 info.result = vmci_ctx_dbell_destroy(cid, info.handle);
 848                 break;
 849
 850         default:
 851                 vmci_ioctl_err("got unknown action (action=%d)\n",
 852                                info.action);
 853                 info.result = VMCI_ERROR_INVALID_ARGS;
 854         }
 855
 856         return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
 857 }
 858
 859 static int vmci_host_do_recv_notifications(struct vmci_host_dev *vmci_host_dev,
 860                                            const char *ioctl_name,
 861                                            void __user *uptr)
 862 {
 863         struct vmci_ctx_notify_recv_info info;
 864         struct vmci_handle_arr *db_handle_array;
 865         struct vmci_handle_arr *qp_handle_array;
 866         void __user *ubuf;
 867         u32 cid;
 868         int retval = 0;
 869
 870         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 871                 vmci_ioctl_err("only valid for contexts\n");
 872                 return -EINVAL;
 873         }
 874
 875         if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
 876                 vmci_ioctl_err("not supported for the current vmx version\n");
 877                 return -EINVAL;
 878         }
 879
 880         if (copy_from_user(&info, uptr, sizeof(info)))
 881                 return -EFAULT;
 882
 883         if ((info.db_handle_buf_size && !info.db_handle_buf_uva) ||
 884             (info.qp_handle_buf_size && !info.qp_handle_buf_uva)) {
 885                 return -EINVAL;
 886         }
 887
 888         cid = vmci_ctx_get_id(vmci_host_dev->context);
 889
 890         info.result = vmci_ctx_rcv_notifications_get(cid,
 891                                 &db_handle_array, &qp_handle_array);
 892         if (info.result != VMCI_SUCCESS)
 893                 return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
 894
 895         ubuf = (void __user *)(uintptr_t)info.db_handle_buf_uva;
 896         info.result = drv_cp_harray_to_user(ubuf, &info.db_handle_buf_size,
 897                                             db_handle_array, &retval);
 898         if (info.result == VMCI_SUCCESS && !retval) {
 899                 ubuf = (void __user *)(uintptr_t)info.qp_handle_buf_uva;
 900                 info.result = drv_cp_harray_to_user(ubuf,
 901                                                     &info.qp_handle_buf_size,
 902                                                     qp_handle_array, &retval);
 903         }
 904
 905         if (!retval && copy_to_user(uptr, &info, sizeof(info)))
 906                 retval = -EFAULT;
 907
 908         vmci_ctx_rcv_notifications_release(cid,
 909                                 db_handle_array, qp_handle_array,
 910                                 info.result == VMCI_SUCCESS && !retval);
 911
 912         return retval;
 913 }
 914
 915 static long vmci_host_unlocked_ioctl(struct file *filp,
 916                                      unsigned int iocmd, unsigned long ioarg)
 917 {
 918 #define VMCI_DO_IOCTL(ioctl_name, ioctl_fn) do {                        \
 919                 char *name = "IOCTL_VMCI_" # ioctl_name;                \
 920                 return vmci_host_do_ ## ioctl_fn(                       \
 921                         vmci_host_dev, name, uptr);                     \
 922         } while (0)
 923
 924         struct vmci_host_dev *vmci_host_dev = filp->private_data;
 925         void __user *uptr = (void __user *)ioarg;
 926
 927         switch (iocmd) {
 928         case IOCTL_VMCI_INIT_CONTEXT:
 929                 VMCI_DO_IOCTL(INIT_CONTEXT, init_context);
 930         case IOCTL_VMCI_DATAGRAM_SEND:
 931                 VMCI_DO_IOCTL(DATAGRAM_SEND, send_datagram);
 932         case IOCTL_VMCI_DATAGRAM_RECEIVE:
 933                 VMCI_DO_IOCTL(DATAGRAM_RECEIVE, receive_datagram);
 934         case IOCTL_VMCI_QUEUEPAIR_ALLOC:
 935                 VMCI_DO_IOCTL(QUEUEPAIR_ALLOC, alloc_queuepair);
 936         case IOCTL_VMCI_QUEUEPAIR_SETVA:
 937                 VMCI_DO_IOCTL(QUEUEPAIR_SETVA, queuepair_setva);
 938         case IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE:
 939                 VMCI_DO_IOCTL(QUEUEPAIR_SETPAGEFILE, queuepair_setpf);
 940         case IOCTL_VMCI_QUEUEPAIR_DETACH:
 941                 VMCI_DO_IOCTL(QUEUEPAIR_DETACH, qp_detach);
 942         case IOCTL_VMCI_CTX_ADD_NOTIFICATION:
 943                 VMCI_DO_IOCTL(CTX_ADD_NOTIFICATION, ctx_add_notify);
 944         case IOCTL_VMCI_CTX_REMOVE_NOTIFICATION:
 945                 VMCI_DO_IOCTL(CTX_REMOVE_NOTIFICATION, ctx_remove_notify);
 946         case IOCTL_VMCI_CTX_GET_CPT_STATE:
 947                 VMCI_DO_IOCTL(CTX_GET_CPT_STATE, ctx_get_cpt_state);
 948         case IOCTL_VMCI_CTX_SET_CPT_STATE:
 949                 VMCI_DO_IOCTL(CTX_SET_CPT_STATE, ctx_set_cpt_state);
 950         case IOCTL_VMCI_GET_CONTEXT_ID:
 951                 VMCI_DO_IOCTL(GET_CONTEXT_ID, get_context_id);
 952         case IOCTL_VMCI_SET_NOTIFY:
 953                 VMCI_DO_IOCTL(SET_NOTIFY, set_notify);
 954         case IOCTL_VMCI_NOTIFY_RESOURCE:
 955                 VMCI_DO_IOCTL(NOTIFY_RESOURCE, notify_resource);
 956         case IOCTL_VMCI_NOTIFICATIONS_RECEIVE:
 957                 VMCI_DO_IOCTL(NOTIFICATIONS_RECEIVE, recv_notifications);
 958
 959         case IOCTL_VMCI_VERSION:
 960         case IOCTL_VMCI_VERSION2:
 961                 return vmci_host_get_version(vmci_host_dev, iocmd, uptr);
 962
 963         default:
 964                 pr_devel("%s: Unknown ioctl (iocmd=%d)\n", __func__, iocmd);
 965                 return -EINVAL;
 966         }
 967
 968 #undef VMCI_DO_IOCTL
 969 }
 970
 971 static const struct file_operations vmuser_fops = {
 972         .owner          = THIS_MODULE,
 973         .open           = vmci_host_open,
 974         .release        = vmci_host_close,
 975         .poll           = vmci_host_poll,
 976         .unlocked_ioctl = vmci_host_unlocked_ioctl,
 977         .compat_ioctl   = compat_ptr_ioctl,
 978 };
 979
 980 static struct miscdevice vmci_host_miscdev = {
 981          .name = "vmci",
 982          .minor = MISC_DYNAMIC_MINOR,
 983          .fops = &vmuser_fops,
 984 };
 985
 986 int __init vmci_host_init(void)
 987 {
 988         int error;
 989
 990         host_context = vmci_ctx_create(VMCI_HOST_CONTEXT_ID,
 991                                         VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS,
 992                                         -1, VMCI_VERSION, NULL);
 993         if (IS_ERR(host_context)) {
 994                 error = PTR_ERR(host_context);
 995                 pr_warn("Failed to initialize VMCIContext (error%d)\n",
 996                         error);
 997                 return error;
 998         }
 999
1000         error = misc_register(&vmci_host_miscdev);
1001         if (error) {
1002                 pr_warn("Module registration error (name=%s, major=%d, minor=%d, err=%d)\n",
1003                         vmci_host_miscdev.name,
1004                         MISC_MAJOR, vmci_host_miscdev.minor,
1005                         error);
1006                 pr_warn("Unable to initialize host personality\n");
1007                 vmci_ctx_destroy(host_context);
1008                 return error;
1009         }
1010
1011         pr_info("VMCI host device registered (name=%s, major=%d, minor=%d)\n",
1012                 vmci_host_miscdev.name, MISC_MAJOR, vmci_host_miscdev.minor);
1013
1014         vmci_host_device_initialized = true;
1015         return 0;
1016 }
1017
1018 void __exit vmci_host_exit(void)
1019 {
1020         vmci_host_device_initialized = false;
1021
1022         misc_deregister(&vmci_host_miscdev);
1023         vmci_ctx_destroy(host_context);
1024         vmci_qp_broker_exit();
1025
1026         pr_debug("VMCI host driver module unloaded\n");
1027 }