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 = vmci_host_dev->context;
 169         __poll_t mask = 0;
 170
 171         if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
 172                 /* Check for VMCI calls to this VM context. */
 173                 if (wait)
 174                         poll_wait(filp, &context->host_context.wait_queue,
 175                                   wait);
 176
 177                 spin_lock(&context->lock);
 178                 if (context->pending_datagrams > 0 ||
 179                     vmci_handle_arr_get_size(
 180                                 context->pending_doorbell_array) > 0) {
 181                         mask = EPOLLIN;
 182                 }
 183                 spin_unlock(&context->lock);
 184         }
 185         return mask;
 186 }
 187
 188 /*
 189  * Copies the handles of a handle array into a user buffer, and
 190  * returns the new length in userBufferSize. If the copy to the
 191  * user buffer fails, the functions still returns VMCI_SUCCESS,
 192  * but retval != 0.
 193  */
 194 static int drv_cp_harray_to_user(void __user *user_buf_uva,
 195                                  u64 *user_buf_size,
 196                                  struct vmci_handle_arr *handle_array,
 197                                  int *retval)
 198 {
 199         u32 array_size = 0;
 200         struct vmci_handle *handles;
 201
 202         if (handle_array)
 203                 array_size = vmci_handle_arr_get_size(handle_array);
 204
 205         if (array_size * sizeof(*handles) > *user_buf_size)
 206                 return VMCI_ERROR_MORE_DATA;
 207
 208         *user_buf_size = array_size * sizeof(*handles);
 209         if (*user_buf_size)
 210                 *retval = copy_to_user(user_buf_uva,
 211                                        vmci_handle_arr_get_handles
 212                                        (handle_array), *user_buf_size);
 213
 214         return VMCI_SUCCESS;
 215 }
 216
 217 /*
 218  * Sets up a given context for notify to work. Maps the notify
 219  * boolean in user VA into kernel space.
 220  */
 221 static int vmci_host_setup_notify(struct vmci_ctx *context,
 222                                   unsigned long uva)
 223 {
 224         int retval;
 225
 226         if (context->notify_page) {
 227                 pr_devel("%s: Notify mechanism is already set up\n", __func__);
 228                 return VMCI_ERROR_DUPLICATE_ENTRY;
 229         }
 230
 231         /*
 232          * We are using 'bool' internally, but let's make sure we explicit
 233          * about the size.
 234          */
 235         BUILD_BUG_ON(sizeof(bool) != sizeof(u8));
 236         if (!access_ok((void __user *)uva, sizeof(u8)))
 237                 return VMCI_ERROR_GENERIC;
 238
 239         /*
 240          * Lock physical page backing a given user VA.
 241          */
 242         retval = get_user_pages_fast(uva, 1, FOLL_WRITE, &context->notify_page);
 243         if (retval != 1) {
 244                 context->notify_page = NULL;
 245                 return VMCI_ERROR_GENERIC;
 246         }
 247
 248         /*
 249          * Map the locked page and set up notify pointer.
 250          */
 251         context->notify = kmap(context->notify_page) + (uva & (PAGE_SIZE - 1));
 252         vmci_ctx_check_signal_notify(context);
 253
 254         return VMCI_SUCCESS;
 255 }
 256
 257 static int vmci_host_get_version(struct vmci_host_dev *vmci_host_dev,
 258                                  unsigned int cmd, void __user *uptr)
 259 {
 260         if (cmd == IOCTL_VMCI_VERSION2) {
 261                 int __user *vptr = uptr;
 262                 if (get_user(vmci_host_dev->user_version, vptr))
 263                         return -EFAULT;
 264         }
 265
 266         /*
 267          * The basic logic here is:
 268          *
 269          * If the user sends in a version of 0 tell it our version.
 270          * If the user didn't send in a version, tell it our version.
 271          * If the user sent in an old version, tell it -its- version.
 272          * If the user sent in an newer version, tell it our version.
 273          *
 274          * The rationale behind telling the caller its version is that
 275          * Workstation 6.5 required that VMX and VMCI kernel module were
 276          * version sync'd.  All new VMX users will be programmed to
 277          * handle the VMCI kernel module version.
 278          */
 279
 280         if (vmci_host_dev->user_version > 0 &&
 281             vmci_host_dev->user_version < VMCI_VERSION_HOSTQP) {
 282                 return vmci_host_dev->user_version;
 283         }
 284
 285         return VMCI_VERSION;
 286 }
 287
 288 #define vmci_ioctl_err(fmt, ...)        \
 289         pr_devel("%s: " fmt, ioctl_name, ##__VA_ARGS__)
 290
 291 static int vmci_host_do_init_context(struct vmci_host_dev *vmci_host_dev,
 292                                      const char *ioctl_name,
 293                                      void __user *uptr)
 294 {
 295         struct vmci_init_blk init_block;
 296         const struct cred *cred;
 297         int retval;
 298
 299         if (copy_from_user(&init_block, uptr, sizeof(init_block))) {
 300                 vmci_ioctl_err("error reading init block\n");
 301                 return -EFAULT;
 302         }
 303
 304         mutex_lock(&vmci_host_dev->lock);
 305
 306         if (vmci_host_dev->ct_type != VMCIOBJ_NOT_SET) {
 307                 vmci_ioctl_err("received VMCI init on initialized handle\n");
 308                 retval = -EINVAL;
 309                 goto out;
 310         }
 311
 312         if (init_block.flags & ~VMCI_PRIVILEGE_FLAG_RESTRICTED) {
 313                 vmci_ioctl_err("unsupported VMCI restriction flag\n");
 314                 retval = -EINVAL;
 315                 goto out;
 316         }
 317
 318         cred = get_current_cred();
 319         vmci_host_dev->context = vmci_ctx_create(init_block.cid,
 320                                                  init_block.flags, 0,
 321                                                  vmci_host_dev->user_version,
 322                                                  cred);
 323         put_cred(cred);
 324         if (IS_ERR(vmci_host_dev->context)) {
 325                 retval = PTR_ERR(vmci_host_dev->context);
 326                 vmci_ioctl_err("error initializing context\n");
 327                 goto out;
 328         }
 329
 330         /*
 331          * Copy cid to userlevel, we do this to allow the VMX
 332          * to enforce its policy on cid generation.
 333          */
 334         init_block.cid = vmci_ctx_get_id(vmci_host_dev->context);
 335         if (copy_to_user(uptr, &init_block, sizeof(init_block))) {
 336                 vmci_ctx_destroy(vmci_host_dev->context);
 337                 vmci_host_dev->context = NULL;
 338                 vmci_ioctl_err("error writing init block\n");
 339                 retval = -EFAULT;
 340                 goto out;
 341         }
 342
 343         vmci_host_dev->ct_type = VMCIOBJ_CONTEXT;
 344         atomic_inc(&vmci_host_active_users);
 345
 346         vmci_call_vsock_callback(true);
 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 = memdup_user((void __user *)(uintptr_t)send_info.addr,
 384                          send_info.len);
 385         if (IS_ERR(dg)) {
 386                 vmci_ioctl_err(
 387                         "cannot allocate memory to dispatch datagram\n");
 388                 return PTR_ERR(dg);
 389         }
 390
 391         if (VMCI_DG_SIZE(dg) != send_info.len) {
 392                 vmci_ioctl_err("datagram size mismatch\n");
 393                 kfree(dg);
 394                 return -EINVAL;
 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
 450         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 451                 vmci_ioctl_err("only valid for contexts\n");
 452                 return -EINVAL;
 453         }
 454
 455         if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 456                 struct vmci_qp_alloc_info_vmvm alloc_info;
 457                 struct vmci_qp_alloc_info_vmvm __user *info = uptr;
 458
 459                 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
 460                         return -EFAULT;
 461
 462                 handle = alloc_info.handle;
 463                 retptr = &info->result;
 464
 465                 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
 466                                                 alloc_info.peer,
 467                                                 alloc_info.flags,
 468                                                 VMCI_NO_PRIVILEGE_FLAGS,
 469                                                 alloc_info.produce_size,
 470                                                 alloc_info.consume_size,
 471                                                 NULL,
 472                                                 vmci_host_dev->context);
 473
 474                 if (vmci_status == VMCI_SUCCESS)
 475                         vmci_status = VMCI_SUCCESS_QUEUEPAIR_CREATE;
 476         } else {
 477                 struct vmci_qp_alloc_info alloc_info;
 478                 struct vmci_qp_alloc_info __user *info = uptr;
 479                 struct vmci_qp_page_store page_store;
 480
 481                 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
 482                         return -EFAULT;
 483
 484                 handle = alloc_info.handle;
 485                 retptr = &info->result;
 486
 487                 page_store.pages = alloc_info.ppn_va;
 488                 page_store.len = alloc_info.num_ppns;
 489
 490                 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
 491                                                 alloc_info.peer,
 492                                                 alloc_info.flags,
 493                                                 VMCI_NO_PRIVILEGE_FLAGS,
 494                                                 alloc_info.produce_size,
 495                                                 alloc_info.consume_size,
 496                                                 &page_store,
 497                                                 vmci_host_dev->context);
 498         }
 499
 500         if (put_user(vmci_status, retptr)) {
 501                 if (vmci_status >= VMCI_SUCCESS) {
 502                         vmci_status = vmci_qp_broker_detach(handle,
 503                                                         vmci_host_dev->context);
 504                 }
 505                 return -EFAULT;
 506         }
 507
 508         return 0;
 509 }
 510
 511 static int vmci_host_do_queuepair_setva(struct vmci_host_dev *vmci_host_dev,
 512                                         const char *ioctl_name,
 513                                         void __user *uptr)
 514 {
 515         struct vmci_qp_set_va_info set_va_info;
 516         struct vmci_qp_set_va_info __user *info = uptr;
 517         s32 result;
 518
 519         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 520                 vmci_ioctl_err("only valid for contexts\n");
 521                 return -EINVAL;
 522         }
 523
 524         if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 525                 vmci_ioctl_err("is not allowed\n");
 526                 return -EINVAL;
 527         }
 528
 529         if (copy_from_user(&set_va_info, uptr, sizeof(set_va_info)))
 530                 return -EFAULT;
 531
 532         if (set_va_info.va) {
 533                 /*
 534                  * VMX is passing down a new VA for the queue
 535                  * pair mapping.
 536                  */
 537                 result = vmci_qp_broker_map(set_va_info.handle,
 538                                             vmci_host_dev->context,
 539                                             set_va_info.va);
 540         } else {
 541                 /*
 542                  * The queue pair is about to be unmapped by
 543                  * the VMX.
 544                  */
 545                 result = vmci_qp_broker_unmap(set_va_info.handle,
 546                                          vmci_host_dev->context, 0);
 547         }
 548
 549         return put_user(result, &info->result) ? -EFAULT : 0;
 550 }
 551
 552 static int vmci_host_do_queuepair_setpf(struct vmci_host_dev *vmci_host_dev,
 553                                         const char *ioctl_name,
 554                                         void __user *uptr)
 555 {
 556         struct vmci_qp_page_file_info page_file_info;
 557         struct vmci_qp_page_file_info __user *info = uptr;
 558         s32 result;
 559
 560         if (vmci_host_dev->user_version < VMCI_VERSION_HOSTQP ||
 561             vmci_host_dev->user_version >= VMCI_VERSION_NOVMVM) {
 562                 vmci_ioctl_err("not supported on this VMX (version=%d)\n",
 563                                vmci_host_dev->user_version);
 564                 return -EINVAL;
 565         }
 566
 567         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 568                 vmci_ioctl_err("only valid for contexts\n");
 569                 return -EINVAL;
 570         }
 571
 572         if (copy_from_user(&page_file_info, uptr, sizeof(*info)))
 573                 return -EFAULT;
 574
 575         /*
 576          * Communicate success pre-emptively to the caller.  Note that the
 577          * basic premise is that it is incumbent upon the caller not to look at
 578          * the info.result field until after the ioctl() returns.  And then,
 579          * only if the ioctl() result indicates no error.  We send up the
 580          * SUCCESS status before calling SetPageStore() store because failing
 581          * to copy up the result code means unwinding the SetPageStore().
 582          *
 583          * It turns out the logic to unwind a SetPageStore() opens a can of
 584          * worms.  For example, if a host had created the queue_pair and a
 585          * guest attaches and SetPageStore() is successful but writing success
 586          * fails, then ... the host has to be stopped from writing (anymore)
 587          * data into the queue_pair.  That means an additional test in the
 588          * VMCI_Enqueue() code path.  Ugh.
 589          */
 590
 591         if (put_user(VMCI_SUCCESS, &info->result)) {
 592                 /*
 593                  * In this case, we can't write a result field of the
 594                  * caller's info block.  So, we don't even try to
 595                  * SetPageStore().
 596                  */
 597                 return -EFAULT;
 598         }
 599
 600         result = vmci_qp_broker_set_page_store(page_file_info.handle,
 601                                                 page_file_info.produce_va,
 602                                                 page_file_info.consume_va,
 603                                                 vmci_host_dev->context);
 604         if (result < VMCI_SUCCESS) {
 605                 if (put_user(result, &info->result)) {
 606                         /*
 607                          * Note that in this case the SetPageStore()
 608                          * call failed but we were unable to
 609                          * communicate that to the caller (because the
 610                          * copy_to_user() call failed).  So, if we
 611                          * simply return an error (in this case
 612                          * -EFAULT) then the caller will know that the
 613                          *  SetPageStore failed even though we couldn't
 614                          *  put the result code in the result field and
 615                          *  indicate exactly why it failed.
 616                          *
 617                          * That says nothing about the issue where we
 618                          * were once able to write to the caller's info
 619                          * memory and now can't.  Something more
 620                          * serious is probably going on than the fact
 621                          * that SetPageStore() didn't work.
 622                          */
 623                         return -EFAULT;
 624                 }
 625         }
 626
 627         return 0;
 628 }
 629
 630 static int vmci_host_do_qp_detach(struct vmci_host_dev *vmci_host_dev,
 631                                   const char *ioctl_name,
 632                                   void __user *uptr)
 633 {
 634         struct vmci_qp_dtch_info detach_info;
 635         struct vmci_qp_dtch_info __user *info = uptr;
 636         s32 result;
 637
 638         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 639                 vmci_ioctl_err("only valid for contexts\n");
 640                 return -EINVAL;
 641         }
 642
 643         if (copy_from_user(&detach_info, uptr, sizeof(detach_info)))
 644                 return -EFAULT;
 645
 646         result = vmci_qp_broker_detach(detach_info.handle,
 647                                        vmci_host_dev->context);
 648         if (result == VMCI_SUCCESS &&
 649             vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 650                 result = VMCI_SUCCESS_LAST_DETACH;
 651         }
 652
 653         return put_user(result, &info->result) ? -EFAULT : 0;
 654 }
 655
 656 static int vmci_host_do_ctx_add_notify(struct vmci_host_dev *vmci_host_dev,
 657                                        const char *ioctl_name,
 658                                        void __user *uptr)
 659 {
 660         struct vmci_ctx_info ar_info;
 661         struct vmci_ctx_info __user *info = uptr;
 662         s32 result;
 663         u32 cid;
 664
 665         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 666                 vmci_ioctl_err("only valid for contexts\n");
 667                 return -EINVAL;
 668         }
 669
 670         if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
 671                 return -EFAULT;
 672
 673         cid = vmci_ctx_get_id(vmci_host_dev->context);
 674         result = vmci_ctx_add_notification(cid, ar_info.remote_cid);
 675
 676         return put_user(result, &info->result) ? -EFAULT : 0;
 677 }
 678
 679 static int vmci_host_do_ctx_remove_notify(struct vmci_host_dev *vmci_host_dev,
 680                                           const char *ioctl_name,
 681                                           void __user *uptr)
 682 {
 683         struct vmci_ctx_info ar_info;
 684         struct vmci_ctx_info __user *info = uptr;
 685         u32 cid;
 686         int result;
 687
 688         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 689                 vmci_ioctl_err("only valid for contexts\n");
 690                 return -EINVAL;
 691         }
 692
 693         if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
 694                 return -EFAULT;
 695
 696         cid = vmci_ctx_get_id(vmci_host_dev->context);
 697         result = vmci_ctx_remove_notification(cid,
 698                                               ar_info.remote_cid);
 699
 700         return put_user(result, &info->result) ? -EFAULT : 0;
 701 }
 702
 703 static int vmci_host_do_ctx_get_cpt_state(struct vmci_host_dev *vmci_host_dev,
 704                                           const char *ioctl_name,
 705                                           void __user *uptr)
 706 {
 707         struct vmci_ctx_chkpt_buf_info get_info;
 708         u32 cid;
 709         void *cpt_buf;
 710         int retval;
 711
 712         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 713                 vmci_ioctl_err("only valid for contexts\n");
 714                 return -EINVAL;
 715         }
 716
 717         if (copy_from_user(&get_info, uptr, sizeof(get_info)))
 718                 return -EFAULT;
 719
 720         cid = vmci_ctx_get_id(vmci_host_dev->context);
 721         get_info.result = vmci_ctx_get_chkpt_state(cid, get_info.cpt_type,
 722                                                 &get_info.buf_size, &cpt_buf);
 723         if (get_info.result == VMCI_SUCCESS && get_info.buf_size) {
 724                 void __user *ubuf = (void __user *)(uintptr_t)get_info.cpt_buf;
 725                 retval = copy_to_user(ubuf, cpt_buf, get_info.buf_size);
 726                 kfree(cpt_buf);
 727
 728                 if (retval)
 729                         return -EFAULT;
 730         }
 731
 732         return copy_to_user(uptr, &get_info, sizeof(get_info)) ? -EFAULT : 0;
 733 }
 734
 735 static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,
 736                                           const char *ioctl_name,
 737                                           void __user *uptr)
 738 {
 739         struct vmci_ctx_chkpt_buf_info set_info;
 740         u32 cid;
 741         void *cpt_buf;
 742         int retval;
 743
 744         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 745                 vmci_ioctl_err("only valid for contexts\n");
 746                 return -EINVAL;
 747         }
 748
 749         if (copy_from_user(&set_info, uptr, sizeof(set_info)))
 750                 return -EFAULT;
 751
 752         cpt_buf = memdup_user((void __user *)(uintptr_t)set_info.cpt_buf,
 753                                 set_info.buf_size);
 754         if (IS_ERR(cpt_buf))
 755                 return PTR_ERR(cpt_buf);
 756
 757         cid = vmci_ctx_get_id(vmci_host_dev->context);
 758         set_info.result = vmci_ctx_set_chkpt_state(cid, set_info.cpt_type,
 759                                                    set_info.buf_size, cpt_buf);
 760
 761         retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;
 762
 763         kfree(cpt_buf);
 764         return retval;
 765 }
 766
 767 static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev,
 768                                        const char *ioctl_name,
 769                                        void __user *uptr)
 770 {
 771         u32 __user *u32ptr = uptr;
 772
 773         return put_user(VMCI_HOST_CONTEXT_ID, u32ptr) ? -EFAULT : 0;
 774 }
 775
 776 static int vmci_host_do_set_notify(struct vmci_host_dev *vmci_host_dev,
 777                                    const char *ioctl_name,
 778                                    void __user *uptr)
 779 {
 780         struct vmci_set_notify_info notify_info;
 781
 782         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 783                 vmci_ioctl_err("only valid for contexts\n");
 784                 return -EINVAL;
 785         }
 786
 787         if (copy_from_user(&notify_info, uptr, sizeof(notify_info)))
 788                 return -EFAULT;
 789
 790         if (notify_info.notify_uva) {
 791                 notify_info.result =
 792                         vmci_host_setup_notify(vmci_host_dev->context,
 793                                                notify_info.notify_uva);
 794         } else {
 795                 vmci_ctx_unset_notify(vmci_host_dev->context);
 796                 notify_info.result = VMCI_SUCCESS;
 797         }
 798
 799         return copy_to_user(uptr, &notify_info, sizeof(notify_info)) ?
 800                 -EFAULT : 0;
 801 }
 802
 803 static int vmci_host_do_notify_resource(struct vmci_host_dev *vmci_host_dev,
 804                                         const char *ioctl_name,
 805                                         void __user *uptr)
 806 {
 807         struct vmci_dbell_notify_resource_info info;
 808         u32 cid;
 809
 810         if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
 811                 vmci_ioctl_err("invalid for current VMX versions\n");
 812                 return -EINVAL;
 813         }
 814
 815         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 816                 vmci_ioctl_err("only valid for contexts\n");
 817                 return -EINVAL;
 818         }
 819
 820         if (copy_from_user(&info, uptr, sizeof(info)))
 821                 return -EFAULT;
 822
 823         cid = vmci_ctx_get_id(vmci_host_dev->context);
 824
 825         switch (info.action) {
 826         case VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY:
 827                 if (info.resource == VMCI_NOTIFY_RESOURCE_DOOR_BELL) {
 828                         u32 flags = VMCI_NO_PRIVILEGE_FLAGS;
 829                         info.result = vmci_ctx_notify_dbell(cid, info.handle,
 830                                                             flags);
 831                 } else {
 832                         info.result = VMCI_ERROR_UNAVAILABLE;
 833                 }
 834                 break;
 835
 836         case VMCI_NOTIFY_RESOURCE_ACTION_CREATE:
 837                 info.result = vmci_ctx_dbell_create(cid, info.handle);
 838                 break;
 839
 840         case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY:
 841                 info.result = vmci_ctx_dbell_destroy(cid, info.handle);
 842                 break;
 843
 844         default:
 845                 vmci_ioctl_err("got unknown action (action=%d)\n",
 846                                info.action);
 847                 info.result = VMCI_ERROR_INVALID_ARGS;
 848         }
 849
 850         return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
 851 }
 852
 853 static int vmci_host_do_recv_notifications(struct vmci_host_dev *vmci_host_dev,
 854                                            const char *ioctl_name,
 855                                            void __user *uptr)
 856 {
 857         struct vmci_ctx_notify_recv_info info;
 858         struct vmci_handle_arr *db_handle_array;
 859         struct vmci_handle_arr *qp_handle_array;
 860         void __user *ubuf;
 861         u32 cid;
 862         int retval = 0;
 863
 864         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 865                 vmci_ioctl_err("only valid for contexts\n");
 866                 return -EINVAL;
 867         }
 868
 869         if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
 870                 vmci_ioctl_err("not supported for the current vmx version\n");
 871                 return -EINVAL;
 872         }
 873
 874         if (copy_from_user(&info, uptr, sizeof(info)))
 875                 return -EFAULT;
 876
 877         if ((info.db_handle_buf_size && !info.db_handle_buf_uva) ||
 878             (info.qp_handle_buf_size && !info.qp_handle_buf_uva)) {
 879                 return -EINVAL;
 880         }
 881
 882         cid = vmci_ctx_get_id(vmci_host_dev->context);
 883
 884         info.result = vmci_ctx_rcv_notifications_get(cid,
 885                                 &db_handle_array, &qp_handle_array);
 886         if (info.result != VMCI_SUCCESS)
 887                 return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
 888
 889         ubuf = (void __user *)(uintptr_t)info.db_handle_buf_uva;
 890         info.result = drv_cp_harray_to_user(ubuf, &info.db_handle_buf_size,
 891                                             db_handle_array, &retval);
 892         if (info.result == VMCI_SUCCESS && !retval) {
 893                 ubuf = (void __user *)(uintptr_t)info.qp_handle_buf_uva;
 894                 info.result = drv_cp_harray_to_user(ubuf,
 895                                                     &info.qp_handle_buf_size,
 896                                                     qp_handle_array, &retval);
 897         }
 898
 899         if (!retval && copy_to_user(uptr, &info, sizeof(info)))
 900                 retval = -EFAULT;
 901
 902         vmci_ctx_rcv_notifications_release(cid,
 903                                 db_handle_array, qp_handle_array,
 904                                 info.result == VMCI_SUCCESS && !retval);
 905
 906         return retval;
 907 }
 908
 909 static long vmci_host_unlocked_ioctl(struct file *filp,
 910                                      unsigned int iocmd, unsigned long ioarg)
 911 {
 912 #define VMCI_DO_IOCTL(ioctl_name, ioctl_fn) do {                        \
 913                 char *name = __stringify(IOCTL_VMCI_ ## ioctl_name);    \
 914                 return vmci_host_do_ ## ioctl_fn(                       \
 915                         vmci_host_dev, name, uptr);                     \
 916         } while (0)
 917
 918         struct vmci_host_dev *vmci_host_dev = filp->private_data;
 919         void __user *uptr = (void __user *)ioarg;
 920
 921         switch (iocmd) {
 922         case IOCTL_VMCI_INIT_CONTEXT:
 923                 VMCI_DO_IOCTL(INIT_CONTEXT, init_context);
 924         case IOCTL_VMCI_DATAGRAM_SEND:
 925                 VMCI_DO_IOCTL(DATAGRAM_SEND, send_datagram);
 926         case IOCTL_VMCI_DATAGRAM_RECEIVE:
 927                 VMCI_DO_IOCTL(DATAGRAM_RECEIVE, receive_datagram);
 928         case IOCTL_VMCI_QUEUEPAIR_ALLOC:
 929                 VMCI_DO_IOCTL(QUEUEPAIR_ALLOC, alloc_queuepair);
 930         case IOCTL_VMCI_QUEUEPAIR_SETVA:
 931                 VMCI_DO_IOCTL(QUEUEPAIR_SETVA, queuepair_setva);
 932         case IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE:
 933                 VMCI_DO_IOCTL(QUEUEPAIR_SETPAGEFILE, queuepair_setpf);
 934         case IOCTL_VMCI_QUEUEPAIR_DETACH:
 935                 VMCI_DO_IOCTL(QUEUEPAIR_DETACH, qp_detach);
 936         case IOCTL_VMCI_CTX_ADD_NOTIFICATION:
 937                 VMCI_DO_IOCTL(CTX_ADD_NOTIFICATION, ctx_add_notify);
 938         case IOCTL_VMCI_CTX_REMOVE_NOTIFICATION:
 939                 VMCI_DO_IOCTL(CTX_REMOVE_NOTIFICATION, ctx_remove_notify);
 940         case IOCTL_VMCI_CTX_GET_CPT_STATE:
 941                 VMCI_DO_IOCTL(CTX_GET_CPT_STATE, ctx_get_cpt_state);
 942         case IOCTL_VMCI_CTX_SET_CPT_STATE:
 943                 VMCI_DO_IOCTL(CTX_SET_CPT_STATE, ctx_set_cpt_state);
 944         case IOCTL_VMCI_GET_CONTEXT_ID:
 945                 VMCI_DO_IOCTL(GET_CONTEXT_ID, get_context_id);
 946         case IOCTL_VMCI_SET_NOTIFY:
 947                 VMCI_DO_IOCTL(SET_NOTIFY, set_notify);
 948         case IOCTL_VMCI_NOTIFY_RESOURCE:
 949                 VMCI_DO_IOCTL(NOTIFY_RESOURCE, notify_resource);
 950         case IOCTL_VMCI_NOTIFICATIONS_RECEIVE:
 951                 VMCI_DO_IOCTL(NOTIFICATIONS_RECEIVE, recv_notifications);
 952
 953         case IOCTL_VMCI_VERSION:
 954         case IOCTL_VMCI_VERSION2:
 955                 return vmci_host_get_version(vmci_host_dev, iocmd, uptr);
 956
 957         default:
 958                 pr_devel("%s: Unknown ioctl (iocmd=%d)\n", __func__, iocmd);
 959                 return -EINVAL;
 960         }
 961
 962 #undef VMCI_DO_IOCTL
 963 }
 964
 965 static const struct file_operations vmuser_fops = {
 966         .owner          = THIS_MODULE,
 967         .open           = vmci_host_open,
 968         .release        = vmci_host_close,
 969         .poll           = vmci_host_poll,
 970         .unlocked_ioctl = vmci_host_unlocked_ioctl,
 971         .compat_ioctl   = compat_ptr_ioctl,
 972 };
 973
 974 static struct miscdevice vmci_host_miscdev = {
 975          .name = "vmci",
 976          .minor = MISC_DYNAMIC_MINOR,
 977          .fops = &vmuser_fops,
 978 };
 979
 980 int __init vmci_host_init(void)
 981 {
 982         int error;
 983
 984         host_context = vmci_ctx_create(VMCI_HOST_CONTEXT_ID,
 985                                         VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS,
 986                                         -1, VMCI_VERSION, NULL);
 987         if (IS_ERR(host_context)) {
 988                 error = PTR_ERR(host_context);
 989                 pr_warn("Failed to initialize VMCIContext (error%d)\n",
 990                         error);
 991                 return error;
 992         }
 993
 994         error = misc_register(&vmci_host_miscdev);
 995         if (error) {
 996                 pr_warn("Module registration error (name=%s, major=%d, minor=%d, err=%d)\n",
 997                         vmci_host_miscdev.name,
 998                         MISC_MAJOR, vmci_host_miscdev.minor,
 999                         error);
1000                 pr_warn("Unable to initialize host personality\n");
1001                 vmci_ctx_destroy(host_context);
1002                 return error;
1003         }
1004
1005         pr_info("VMCI host device registered (name=%s, major=%d, minor=%d)\n",
1006                 vmci_host_miscdev.name, MISC_MAJOR, vmci_host_miscdev.minor);
1007
1008         vmci_host_device_initialized = true;
1009         return 0;
1010 }
1011
1012 void __exit vmci_host_exit(void)
1013 {
1014         vmci_host_device_initialized = false;
1015
1016         misc_deregister(&vmci_host_miscdev);
1017         vmci_ctx_destroy(host_context);
1018         vmci_qp_broker_exit();
1019
1020         pr_debug("VMCI host driver module unloaded\n");
1021 }