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/miscdevice.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/highmem.h>
  21 #include <linux/atomic.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/mutex.h>
  25 #include <linux/sched.h>
  26 #include <linux/cred.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 __poll_t 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         __poll_t 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 = EPOLLIN;
 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
 451         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 452                 vmci_ioctl_err("only valid for contexts\n");
 453                 return -EINVAL;
 454         }
 455
 456         if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 457                 struct vmci_qp_alloc_info_vmvm alloc_info;
 458                 struct vmci_qp_alloc_info_vmvm __user *info = uptr;
 459
 460                 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
 461                         return -EFAULT;
 462
 463                 handle = alloc_info.handle;
 464                 retptr = &info->result;
 465
 466                 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
 467                                                 alloc_info.peer,
 468                                                 alloc_info.flags,
 469                                                 VMCI_NO_PRIVILEGE_FLAGS,
 470                                                 alloc_info.produce_size,
 471                                                 alloc_info.consume_size,
 472                                                 NULL,
 473                                                 vmci_host_dev->context);
 474
 475                 if (vmci_status == VMCI_SUCCESS)
 476                         vmci_status = VMCI_SUCCESS_QUEUEPAIR_CREATE;
 477         } else {
 478                 struct vmci_qp_alloc_info alloc_info;
 479                 struct vmci_qp_alloc_info __user *info = uptr;
 480                 struct vmci_qp_page_store page_store;
 481
 482                 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
 483                         return -EFAULT;
 484
 485                 handle = alloc_info.handle;
 486                 retptr = &info->result;
 487
 488                 page_store.pages = alloc_info.ppn_va;
 489                 page_store.len = alloc_info.num_ppns;
 490
 491                 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
 492                                                 alloc_info.peer,
 493                                                 alloc_info.flags,
 494                                                 VMCI_NO_PRIVILEGE_FLAGS,
 495                                                 alloc_info.produce_size,
 496                                                 alloc_info.consume_size,
 497                                                 &page_store,
 498                                                 vmci_host_dev->context);
 499         }
 500
 501         if (put_user(vmci_status, retptr)) {
 502                 if (vmci_status >= VMCI_SUCCESS) {
 503                         vmci_status = vmci_qp_broker_detach(handle,
 504                                                         vmci_host_dev->context);
 505                 }
 506                 return -EFAULT;
 507         }
 508
 509         return 0;
 510 }
 511
 512 static int vmci_host_do_queuepair_setva(struct vmci_host_dev *vmci_host_dev,
 513                                         const char *ioctl_name,
 514                                         void __user *uptr)
 515 {
 516         struct vmci_qp_set_va_info set_va_info;
 517         struct vmci_qp_set_va_info __user *info = uptr;
 518         s32 result;
 519
 520         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 521                 vmci_ioctl_err("only valid for contexts\n");
 522                 return -EINVAL;
 523         }
 524
 525         if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 526                 vmci_ioctl_err("is not allowed\n");
 527                 return -EINVAL;
 528         }
 529
 530         if (copy_from_user(&set_va_info, uptr, sizeof(set_va_info)))
 531                 return -EFAULT;
 532
 533         if (set_va_info.va) {
 534                 /*
 535                  * VMX is passing down a new VA for the queue
 536                  * pair mapping.
 537                  */
 538                 result = vmci_qp_broker_map(set_va_info.handle,
 539                                             vmci_host_dev->context,
 540                                             set_va_info.va);
 541         } else {
 542                 /*
 543                  * The queue pair is about to be unmapped by
 544                  * the VMX.
 545                  */
 546                 result = vmci_qp_broker_unmap(set_va_info.handle,
 547                                          vmci_host_dev->context, 0);
 548         }
 549
 550         return put_user(result, &info->result) ? -EFAULT : 0;
 551 }
 552
 553 static int vmci_host_do_queuepair_setpf(struct vmci_host_dev *vmci_host_dev,
 554                                         const char *ioctl_name,
 555                                         void __user *uptr)
 556 {
 557         struct vmci_qp_page_file_info page_file_info;
 558         struct vmci_qp_page_file_info __user *info = uptr;
 559         s32 result;
 560
 561         if (vmci_host_dev->user_version < VMCI_VERSION_HOSTQP ||
 562             vmci_host_dev->user_version >= VMCI_VERSION_NOVMVM) {
 563                 vmci_ioctl_err("not supported on this VMX (version=%d)\n",
 564                                vmci_host_dev->user_version);
 565                 return -EINVAL;
 566         }
 567
 568         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 569                 vmci_ioctl_err("only valid for contexts\n");
 570                 return -EINVAL;
 571         }
 572
 573         if (copy_from_user(&page_file_info, uptr, sizeof(*info)))
 574                 return -EFAULT;
 575
 576         /*
 577          * Communicate success pre-emptively to the caller.  Note that the
 578          * basic premise is that it is incumbent upon the caller not to look at
 579          * the info.result field until after the ioctl() returns.  And then,
 580          * only if the ioctl() result indicates no error.  We send up the
 581          * SUCCESS status before calling SetPageStore() store because failing
 582          * to copy up the result code means unwinding the SetPageStore().
 583          *
 584          * It turns out the logic to unwind a SetPageStore() opens a can of
 585          * worms.  For example, if a host had created the queue_pair and a
 586          * guest attaches and SetPageStore() is successful but writing success
 587          * fails, then ... the host has to be stopped from writing (anymore)
 588          * data into the queue_pair.  That means an additional test in the
 589          * VMCI_Enqueue() code path.  Ugh.
 590          */
 591
 592         if (put_user(VMCI_SUCCESS, &info->result)) {
 593                 /*
 594                  * In this case, we can't write a result field of the
 595                  * caller's info block.  So, we don't even try to
 596                  * SetPageStore().
 597                  */
 598                 return -EFAULT;
 599         }
 600
 601         result = vmci_qp_broker_set_page_store(page_file_info.handle,
 602                                                 page_file_info.produce_va,
 603                                                 page_file_info.consume_va,
 604                                                 vmci_host_dev->context);
 605         if (result < VMCI_SUCCESS) {
 606                 if (put_user(result, &info->result)) {
 607                         /*
 608                          * Note that in this case the SetPageStore()
 609                          * call failed but we were unable to
 610                          * communicate that to the caller (because the
 611                          * copy_to_user() call failed).  So, if we
 612                          * simply return an error (in this case
 613                          * -EFAULT) then the caller will know that the
 614                          *  SetPageStore failed even though we couldn't
 615                          *  put the result code in the result field and
 616                          *  indicate exactly why it failed.
 617                          *
 618                          * That says nothing about the issue where we
 619                          * were once able to write to the caller's info
 620                          * memory and now can't.  Something more
 621                          * serious is probably going on than the fact
 622                          * that SetPageStore() didn't work.
 623                          */
 624                         return -EFAULT;
 625                 }
 626         }
 627
 628         return 0;
 629 }
 630
 631 static int vmci_host_do_qp_detach(struct vmci_host_dev *vmci_host_dev,
 632                                   const char *ioctl_name,
 633                                   void __user *uptr)
 634 {
 635         struct vmci_qp_dtch_info detach_info;
 636         struct vmci_qp_dtch_info __user *info = uptr;
 637         s32 result;
 638
 639         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 640                 vmci_ioctl_err("only valid for contexts\n");
 641                 return -EINVAL;
 642         }
 643
 644         if (copy_from_user(&detach_info, uptr, sizeof(detach_info)))
 645                 return -EFAULT;
 646
 647         result = vmci_qp_broker_detach(detach_info.handle,
 648                                        vmci_host_dev->context);
 649         if (result == VMCI_SUCCESS &&
 650             vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 651                 result = VMCI_SUCCESS_LAST_DETACH;
 652         }
 653
 654         return put_user(result, &info->result) ? -EFAULT : 0;
 655 }
 656
 657 static int vmci_host_do_ctx_add_notify(struct vmci_host_dev *vmci_host_dev,
 658                                        const char *ioctl_name,
 659                                        void __user *uptr)
 660 {
 661         struct vmci_ctx_info ar_info;
 662         struct vmci_ctx_info __user *info = uptr;
 663         s32 result;
 664         u32 cid;
 665
 666         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 667                 vmci_ioctl_err("only valid for contexts\n");
 668                 return -EINVAL;
 669         }
 670
 671         if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
 672                 return -EFAULT;
 673
 674         cid = vmci_ctx_get_id(vmci_host_dev->context);
 675         result = vmci_ctx_add_notification(cid, ar_info.remote_cid);
 676
 677         return put_user(result, &info->result) ? -EFAULT : 0;
 678 }
 679
 680 static int vmci_host_do_ctx_remove_notify(struct vmci_host_dev *vmci_host_dev,
 681                                           const char *ioctl_name,
 682                                           void __user *uptr)
 683 {
 684         struct vmci_ctx_info ar_info;
 685         struct vmci_ctx_info __user *info = uptr;
 686         u32 cid;
 687         int result;
 688
 689         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 690                 vmci_ioctl_err("only valid for contexts\n");
 691                 return -EINVAL;
 692         }
 693
 694         if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
 695                 return -EFAULT;
 696
 697         cid = vmci_ctx_get_id(vmci_host_dev->context);
 698         result = vmci_ctx_remove_notification(cid,
 699                                               ar_info.remote_cid);
 700
 701         return put_user(result, &info->result) ? -EFAULT : 0;
 702 }
 703
 704 static int vmci_host_do_ctx_get_cpt_state(struct vmci_host_dev *vmci_host_dev,
 705                                           const char *ioctl_name,
 706                                           void __user *uptr)
 707 {
 708         struct vmci_ctx_chkpt_buf_info get_info;
 709         u32 cid;
 710         void *cpt_buf;
 711         int retval;
 712
 713         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 714                 vmci_ioctl_err("only valid for contexts\n");
 715                 return -EINVAL;
 716         }
 717
 718         if (copy_from_user(&get_info, uptr, sizeof(get_info)))
 719                 return -EFAULT;
 720
 721         cid = vmci_ctx_get_id(vmci_host_dev->context);
 722         get_info.result = vmci_ctx_get_chkpt_state(cid, get_info.cpt_type,
 723                                                 &get_info.buf_size, &cpt_buf);
 724         if (get_info.result == VMCI_SUCCESS && get_info.buf_size) {
 725                 void __user *ubuf = (void __user *)(uintptr_t)get_info.cpt_buf;
 726                 retval = copy_to_user(ubuf, cpt_buf, get_info.buf_size);
 727                 kfree(cpt_buf);
 728
 729                 if (retval)
 730                         return -EFAULT;
 731         }
 732
 733         return copy_to_user(uptr, &get_info, sizeof(get_info)) ? -EFAULT : 0;
 734 }
 735
 736 static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,
 737                                           const char *ioctl_name,
 738                                           void __user *uptr)
 739 {
 740         struct vmci_ctx_chkpt_buf_info set_info;
 741         u32 cid;
 742         void *cpt_buf;
 743         int retval;
 744
 745         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 746                 vmci_ioctl_err("only valid for contexts\n");
 747                 return -EINVAL;
 748         }
 749
 750         if (copy_from_user(&set_info, uptr, sizeof(set_info)))
 751                 return -EFAULT;
 752
 753         cpt_buf = kmalloc(set_info.buf_size, GFP_KERNEL);
 754         if (!cpt_buf) {
 755                 vmci_ioctl_err(
 756                         "cannot allocate memory to set cpt state (type=%d)\n",
 757                         set_info.cpt_type);
 758                 return -ENOMEM;
 759         }
 760
 761         if (copy_from_user(cpt_buf, (void __user *)(uintptr_t)set_info.cpt_buf,
 762                            set_info.buf_size)) {
 763                 retval = -EFAULT;
 764                 goto out;
 765         }
 766
 767         cid = vmci_ctx_get_id(vmci_host_dev->context);
 768         set_info.result = vmci_ctx_set_chkpt_state(cid, set_info.cpt_type,
 769                                                    set_info.buf_size, cpt_buf);
 770
 771         retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;
 772
 773 out:
 774         kfree(cpt_buf);
 775         return retval;
 776 }
 777
 778 static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev,
 779                                        const char *ioctl_name,
 780                                        void __user *uptr)
 781 {
 782         u32 __user *u32ptr = uptr;
 783
 784         return put_user(VMCI_HOST_CONTEXT_ID, u32ptr) ? -EFAULT : 0;
 785 }
 786
 787 static int vmci_host_do_set_notify(struct vmci_host_dev *vmci_host_dev,
 788                                    const char *ioctl_name,
 789                                    void __user *uptr)
 790 {
 791         struct vmci_set_notify_info notify_info;
 792
 793         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 794                 vmci_ioctl_err("only valid for contexts\n");
 795                 return -EINVAL;
 796         }
 797
 798         if (copy_from_user(&notify_info, uptr, sizeof(notify_info)))
 799                 return -EFAULT;
 800
 801         if (notify_info.notify_uva) {
 802                 notify_info.result =
 803                         vmci_host_setup_notify(vmci_host_dev->context,
 804                                                notify_info.notify_uva);
 805         } else {
 806                 vmci_ctx_unset_notify(vmci_host_dev->context);
 807                 notify_info.result = VMCI_SUCCESS;
 808         }
 809
 810         return copy_to_user(uptr, &notify_info, sizeof(notify_info)) ?
 811                 -EFAULT : 0;
 812 }
 813
 814 static int vmci_host_do_notify_resource(struct vmci_host_dev *vmci_host_dev,
 815                                         const char *ioctl_name,
 816                                         void __user *uptr)
 817 {
 818         struct vmci_dbell_notify_resource_info info;
 819         u32 cid;
 820
 821         if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
 822                 vmci_ioctl_err("invalid for current VMX versions\n");
 823                 return -EINVAL;
 824         }
 825
 826         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 827                 vmci_ioctl_err("only valid for contexts\n");
 828                 return -EINVAL;
 829         }
 830
 831         if (copy_from_user(&info, uptr, sizeof(info)))
 832                 return -EFAULT;
 833
 834         cid = vmci_ctx_get_id(vmci_host_dev->context);
 835
 836         switch (info.action) {
 837         case VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY:
 838                 if (info.resource == VMCI_NOTIFY_RESOURCE_DOOR_BELL) {
 839                         u32 flags = VMCI_NO_PRIVILEGE_FLAGS;
 840                         info.result = vmci_ctx_notify_dbell(cid, info.handle,
 841                                                             flags);
 842                 } else {
 843                         info.result = VMCI_ERROR_UNAVAILABLE;
 844                 }
 845                 break;
 846
 847         case VMCI_NOTIFY_RESOURCE_ACTION_CREATE:
 848                 info.result = vmci_ctx_dbell_create(cid, info.handle);
 849                 break;
 850
 851         case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY:
 852                 info.result = vmci_ctx_dbell_destroy(cid, info.handle);
 853                 break;
 854
 855         default:
 856                 vmci_ioctl_err("got unknown action (action=%d)\n",
 857                                info.action);
 858                 info.result = VMCI_ERROR_INVALID_ARGS;
 859         }
 860
 861         return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
 862 }
 863
 864 static int vmci_host_do_recv_notifications(struct vmci_host_dev *vmci_host_dev,
 865                                            const char *ioctl_name,
 866                                            void __user *uptr)
 867 {
 868         struct vmci_ctx_notify_recv_info info;
 869         struct vmci_handle_arr *db_handle_array;
 870         struct vmci_handle_arr *qp_handle_array;
 871         void __user *ubuf;
 872         u32 cid;
 873         int retval = 0;
 874
 875         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 876                 vmci_ioctl_err("only valid for contexts\n");
 877                 return -EINVAL;
 878         }
 879
 880         if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
 881                 vmci_ioctl_err("not supported for the current vmx version\n");
 882                 return -EINVAL;
 883         }
 884
 885         if (copy_from_user(&info, uptr, sizeof(info)))
 886                 return -EFAULT;
 887
 888         if ((info.db_handle_buf_size && !info.db_handle_buf_uva) ||
 889             (info.qp_handle_buf_size && !info.qp_handle_buf_uva)) {
 890                 return -EINVAL;
 891         }
 892
 893         cid = vmci_ctx_get_id(vmci_host_dev->context);
 894
 895         info.result = vmci_ctx_rcv_notifications_get(cid,
 896                                 &db_handle_array, &qp_handle_array);
 897         if (info.result != VMCI_SUCCESS)
 898                 return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
 899
 900         ubuf = (void __user *)(uintptr_t)info.db_handle_buf_uva;
 901         info.result = drv_cp_harray_to_user(ubuf, &info.db_handle_buf_size,
 902                                             db_handle_array, &retval);
 903         if (info.result == VMCI_SUCCESS && !retval) {
 904                 ubuf = (void __user *)(uintptr_t)info.qp_handle_buf_uva;
 905                 info.result = drv_cp_harray_to_user(ubuf,
 906                                                     &info.qp_handle_buf_size,
 907                                                     qp_handle_array, &retval);
 908         }
 909
 910         if (!retval && copy_to_user(uptr, &info, sizeof(info)))
 911                 retval = -EFAULT;
 912
 913         vmci_ctx_rcv_notifications_release(cid,
 914                                 db_handle_array, qp_handle_array,
 915                                 info.result == VMCI_SUCCESS && !retval);
 916
 917         return retval;
 918 }
 919
 920 static long vmci_host_unlocked_ioctl(struct file *filp,
 921                                      unsigned int iocmd, unsigned long ioarg)
 922 {
 923 #define VMCI_DO_IOCTL(ioctl_name, ioctl_fn) do {                        \
 924                 char *name = __stringify(IOCTL_VMCI_ ## ioctl_name);    \
 925                 return vmci_host_do_ ## ioctl_fn(                       \
 926                         vmci_host_dev, name, uptr);                     \
 927         } while (0)
 928
 929         struct vmci_host_dev *vmci_host_dev = filp->private_data;
 930         void __user *uptr = (void __user *)ioarg;
 931
 932         switch (iocmd) {
 933         case IOCTL_VMCI_INIT_CONTEXT:
 934                 VMCI_DO_IOCTL(INIT_CONTEXT, init_context);
 935         case IOCTL_VMCI_DATAGRAM_SEND:
 936                 VMCI_DO_IOCTL(DATAGRAM_SEND, send_datagram);
 937         case IOCTL_VMCI_DATAGRAM_RECEIVE:
 938                 VMCI_DO_IOCTL(DATAGRAM_RECEIVE, receive_datagram);
 939         case IOCTL_VMCI_QUEUEPAIR_ALLOC:
 940                 VMCI_DO_IOCTL(QUEUEPAIR_ALLOC, alloc_queuepair);
 941         case IOCTL_VMCI_QUEUEPAIR_SETVA:
 942                 VMCI_DO_IOCTL(QUEUEPAIR_SETVA, queuepair_setva);
 943         case IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE:
 944                 VMCI_DO_IOCTL(QUEUEPAIR_SETPAGEFILE, queuepair_setpf);
 945         case IOCTL_VMCI_QUEUEPAIR_DETACH:
 946                 VMCI_DO_IOCTL(QUEUEPAIR_DETACH, qp_detach);
 947         case IOCTL_VMCI_CTX_ADD_NOTIFICATION:
 948                 VMCI_DO_IOCTL(CTX_ADD_NOTIFICATION, ctx_add_notify);
 949         case IOCTL_VMCI_CTX_REMOVE_NOTIFICATION:
 950                 VMCI_DO_IOCTL(CTX_REMOVE_NOTIFICATION, ctx_remove_notify);
 951         case IOCTL_VMCI_CTX_GET_CPT_STATE:
 952                 VMCI_DO_IOCTL(CTX_GET_CPT_STATE, ctx_get_cpt_state);
 953         case IOCTL_VMCI_CTX_SET_CPT_STATE:
 954                 VMCI_DO_IOCTL(CTX_SET_CPT_STATE, ctx_set_cpt_state);
 955         case IOCTL_VMCI_GET_CONTEXT_ID:
 956                 VMCI_DO_IOCTL(GET_CONTEXT_ID, get_context_id);
 957         case IOCTL_VMCI_SET_NOTIFY:
 958                 VMCI_DO_IOCTL(SET_NOTIFY, set_notify);
 959         case IOCTL_VMCI_NOTIFY_RESOURCE:
 960                 VMCI_DO_IOCTL(NOTIFY_RESOURCE, notify_resource);
 961         case IOCTL_VMCI_NOTIFICATIONS_RECEIVE:
 962                 VMCI_DO_IOCTL(NOTIFICATIONS_RECEIVE, recv_notifications);
 963
 964         case IOCTL_VMCI_VERSION:
 965         case IOCTL_VMCI_VERSION2:
 966                 return vmci_host_get_version(vmci_host_dev, iocmd, uptr);
 967
 968         default:
 969                 pr_devel("%s: Unknown ioctl (iocmd=%d)\n", __func__, iocmd);
 970                 return -EINVAL;
 971         }
 972
 973 #undef VMCI_DO_IOCTL
 974 }
 975
 976 static const struct file_operations vmuser_fops = {
 977         .owner          = THIS_MODULE,
 978         .open           = vmci_host_open,
 979         .release        = vmci_host_close,
 980         .poll           = vmci_host_poll,
 981         .unlocked_ioctl = vmci_host_unlocked_ioctl,
 982         .compat_ioctl   = vmci_host_unlocked_ioctl,
 983 };
 984
 985 static struct miscdevice vmci_host_miscdev = {
 986          .name = "vmci",
 987          .minor = MISC_DYNAMIC_MINOR,
 988          .fops = &vmuser_fops,
 989 };
 990
 991 int __init vmci_host_init(void)
 992 {
 993         int error;
 994
 995         host_context = vmci_ctx_create(VMCI_HOST_CONTEXT_ID,
 996                                         VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS,
 997                                         -1, VMCI_VERSION, NULL);
 998         if (IS_ERR(host_context)) {
 999                 error = PTR_ERR(host_context);
1000                 pr_warn("Failed to initialize VMCIContext (error%d)\n",
1001                         error);
1002                 return error;
1003         }
1004
1005         error = misc_register(&vmci_host_miscdev);
1006         if (error) {
1007                 pr_warn("Module registration error (name=%s, major=%d, minor=%d, err=%d)\n",
1008                         vmci_host_miscdev.name,
1009                         MISC_MAJOR, vmci_host_miscdev.minor,
1010                         error);
1011                 pr_warn("Unable to initialize host personality\n");
1012                 vmci_ctx_destroy(host_context);
1013                 return error;
1014         }
1015
1016         pr_info("VMCI host device registered (name=%s, major=%d, minor=%d)\n",
1017                 vmci_host_miscdev.name, MISC_MAJOR, vmci_host_miscdev.minor);
1018
1019         vmci_host_device_initialized = true;
1020         return 0;
1021 }
1022
1023 void __exit vmci_host_exit(void)
1024 {
1025         vmci_host_device_initialized = false;
1026
1027         misc_deregister(&vmci_host_miscdev);
1028         vmci_ctx_destroy(host_context);
1029         vmci_qp_broker_exit();
1030
1031         pr_debug("VMCI host driver module unloaded\n");
1032 }