Pileus Git - ~andy/linux/blob - drivers/misc/vmw_vmci/vmci_host.c

   1 /*
   2  * VMware VMCI Driver
   3  *
   4  * Copyright (C) 2012 VMware, Inc. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation version 2 and no later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  */
  15
  16 #include <linux/vmw_vmci_defs.h>
  17 #include <linux/vmw_vmci_api.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/miscdevice.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/highmem.h>
  22 #include <linux/atomic.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/mutex.h>
  26 #include <linux/sched.h>
  27 #include <linux/slab.h>
  28 #include <linux/file.h>
  29 #include <linux/init.h>
  30 #include <linux/poll.h>
  31 #include <linux/pci.h>
  32 #include <linux/smp.h>
  33 #include <linux/fs.h>
  34 #include <linux/io.h>
  35
  36 #include "vmci_handle_array.h"
  37 #include "vmci_queue_pair.h"
  38 #include "vmci_datagram.h"
  39 #include "vmci_doorbell.h"
  40 #include "vmci_resource.h"
  41 #include "vmci_context.h"
  42 #include "vmci_driver.h"
  43 #include "vmci_event.h"
  44
  45 #define VMCI_UTIL_NUM_RESOURCES 1
  46
  47 enum {
  48         VMCI_NOTIFY_RESOURCE_QUEUE_PAIR = 0,
  49         VMCI_NOTIFY_RESOURCE_DOOR_BELL = 1,
  50 };
  51
  52 enum {
  53         VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY = 0,
  54         VMCI_NOTIFY_RESOURCE_ACTION_CREATE = 1,
  55         VMCI_NOTIFY_RESOURCE_ACTION_DESTROY = 2,
  56 };
  57
  58 /*
  59  * VMCI driver initialization. This block can also be used to
  60  * pass initial group membership etc.
  61  */
  62 struct vmci_init_blk {
  63         u32 cid;
  64         u32 flags;
  65 };
  66
  67 /* VMCIqueue_pairAllocInfo_VMToVM */
  68 struct vmci_qp_alloc_info_vmvm {
  69         struct vmci_handle handle;
  70         u32 peer;
  71         u32 flags;
  72         u64 produce_size;
  73         u64 consume_size;
  74         u64 produce_page_file;    /* User VA. */
  75         u64 consume_page_file;    /* User VA. */
  76         u64 produce_page_file_size;  /* Size of the file name array. */
  77         u64 consume_page_file_size;  /* Size of the file name array. */
  78         s32 result;
  79         u32 _pad;
  80 };
  81
  82 /* VMCISetNotifyInfo: Used to pass notify flag's address to the host driver. */
  83 struct vmci_set_notify_info {
  84         u64 notify_uva;
  85         s32 result;
  86         u32 _pad;
  87 };
  88
  89 /*
  90  * Per-instance host state
  91  */
  92 struct vmci_host_dev {
  93         struct vmci_ctx *context;
  94         int user_version;
  95         enum vmci_obj_type ct_type;
  96         struct mutex lock;  /* Mutex lock for vmci context access */
  97 };
  98
  99 static struct vmci_ctx *host_context;
 100 static bool vmci_host_device_initialized;
 101 static atomic_t vmci_host_active_users = ATOMIC_INIT(0);
 102
 103 /*
 104  * Determines whether the VMCI host personality is
 105  * available. Since the core functionality of the host driver is
 106  * always present, all guests could possibly use the host
 107  * personality. However, to minimize the deviation from the
 108  * pre-unified driver state of affairs, we only consider the host
 109  * device active if there is no active guest device or if there
 110  * are VMX'en with active VMCI contexts using the host device.
 111  */
 112 bool vmci_host_code_active(void)
 113 {
 114         return vmci_host_device_initialized &&
 115             (!vmci_guest_code_active() ||
 116              atomic_read(&vmci_host_active_users) > 0);
 117 }
 118
 119 /*
 120  * Called on open of /dev/vmci.
 121  */
 122 static int vmci_host_open(struct inode *inode, struct file *filp)
 123 {
 124         struct vmci_host_dev *vmci_host_dev;
 125
 126         vmci_host_dev = kzalloc(sizeof(struct vmci_host_dev), GFP_KERNEL);
 127         if (vmci_host_dev == NULL)
 128                 return -ENOMEM;
 129
 130         vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
 131         mutex_init(&vmci_host_dev->lock);
 132         filp->private_data = vmci_host_dev;
 133
 134         return 0;
 135 }
 136
 137 /*
 138  * Called on close of /dev/vmci, most often when the process
 139  * exits.
 140  */
 141 static int vmci_host_close(struct inode *inode, struct file *filp)
 142 {
 143         struct vmci_host_dev *vmci_host_dev = filp->private_data;
 144
 145         if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
 146                 vmci_ctx_destroy(vmci_host_dev->context);
 147                 vmci_host_dev->context = NULL;
 148
 149                 /*
 150                  * The number of active contexts is used to track whether any
 151                  * VMX'en are using the host personality. It is incremented when
 152                  * a context is created through the IOCTL_VMCI_INIT_CONTEXT
 153                  * ioctl.
 154                  */
 155                 atomic_dec(&vmci_host_active_users);
 156         }
 157         vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
 158
 159         kfree(vmci_host_dev);
 160         filp->private_data = NULL;
 161         return 0;
 162 }
 163
 164 /*
 165  * This is used to wake up the VMX when a VMCI call arrives, or
 166  * to wake up select() or poll() at the next clock tick.
 167  */
 168 static unsigned int vmci_host_poll(struct file *filp, poll_table *wait)
 169 {
 170         struct vmci_host_dev *vmci_host_dev = filp->private_data;
 171         struct vmci_ctx *context = vmci_host_dev->context;
 172         unsigned int mask = 0;
 173
 174         if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
 175                 /* Check for VMCI calls to this VM context. */
 176                 if (wait)
 177                         poll_wait(filp, &context->host_context.wait_queue,
 178                                   wait);
 179
 180                 spin_lock(&context->lock);
 181                 if (context->pending_datagrams > 0 ||
 182                     vmci_handle_arr_get_size(
 183                                 context->pending_doorbell_array) > 0) {
 184                         mask = POLLIN;
 185                 }
 186                 spin_unlock(&context->lock);
 187         }
 188         return mask;
 189 }
 190
 191 /*
 192  * Copies the handles of a handle array into a user buffer, and
 193  * returns the new length in userBufferSize. If the copy to the
 194  * user buffer fails, the functions still returns VMCI_SUCCESS,
 195  * but retval != 0.
 196  */
 197 static int drv_cp_harray_to_user(void __user *user_buf_uva,
 198                                  u64 *user_buf_size,
 199                                  struct vmci_handle_arr *handle_array,
 200                                  int *retval)
 201 {
 202         u32 array_size = 0;
 203         struct vmci_handle *handles;
 204
 205         if (handle_array)
 206                 array_size = vmci_handle_arr_get_size(handle_array);
 207
 208         if (array_size * sizeof(*handles) > *user_buf_size)
 209                 return VMCI_ERROR_MORE_DATA;
 210
 211         *user_buf_size = array_size * sizeof(*handles);
 212         if (*user_buf_size)
 213                 *retval = copy_to_user(user_buf_uva,
 214                                        vmci_handle_arr_get_handles
 215                                        (handle_array), *user_buf_size);
 216
 217         return VMCI_SUCCESS;
 218 }
 219
 220 /*
 221  * Sets up a given context for notify to work.  Calls drv_map_bool_ptr()
 222  * which maps the notify boolean in user VA in kernel space.
 223  */
 224 static int vmci_host_setup_notify(struct vmci_ctx *context,
 225                                   unsigned long uva)
 226 {
 227         struct page *page;
 228         int retval;
 229
 230         if (context->notify_page) {
 231                 pr_devel("%s: Notify mechanism is already set up\n", __func__);
 232                 return VMCI_ERROR_DUPLICATE_ENTRY;
 233         }
 234
 235         /*
 236          * We are using 'bool' internally, but let's make sure we explicit
 237          * about the size.
 238          */
 239         BUILD_BUG_ON(sizeof(bool) != sizeof(u8));
 240         if (!access_ok(VERIFY_WRITE, (void __user *)uva, sizeof(u8)))
 241                 return VMCI_ERROR_GENERIC;
 242
 243         /*
 244          * Lock physical page backing a given user VA.
 245          */
 246         down_read(&current->mm->mmap_sem);
 247         retval = get_user_pages(current, current->mm,
 248                                 PAGE_ALIGN(uva),
 249                                 1, 1, 0, &page, NULL);
 250         up_read(&current->mm->mmap_sem);
 251         if (retval != 1)
 252                 return VMCI_ERROR_GENERIC;
 253
 254         /*
 255          * Map the locked page and set up notify pointer.
 256          */
 257         context->notify = kmap(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         retval = 0;
 353
 354 out:
 355         mutex_unlock(&vmci_host_dev->lock);
 356         return retval;
 357 }
 358
 359 static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev,
 360                                       const char *ioctl_name,
 361                                       void __user *uptr)
 362 {
 363         struct vmci_datagram_snd_rcv_info send_info;
 364         struct vmci_datagram *dg = NULL;
 365         u32 cid;
 366
 367         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 368                 vmci_ioctl_err("only valid for contexts\n");
 369                 return -EINVAL;
 370         }
 371
 372         if (copy_from_user(&send_info, uptr, sizeof(send_info)))
 373                 return -EFAULT;
 374
 375         if (send_info.len > VMCI_MAX_DG_SIZE) {
 376                 vmci_ioctl_err("datagram is too big (size=%d)\n",
 377                                send_info.len);
 378                 return -EINVAL;
 379         }
 380
 381         if (send_info.len < sizeof(*dg)) {
 382                 vmci_ioctl_err("datagram is too small (size=%d)\n",
 383                                send_info.len);
 384                 return -EINVAL;
 385         }
 386
 387         dg = kmalloc(send_info.len, GFP_KERNEL);
 388         if (!dg) {
 389                 vmci_ioctl_err(
 390                         "cannot allocate memory to dispatch datagram\n");
 391                 return -ENOMEM;
 392         }
 393
 394         if (copy_from_user(dg, (void __user *)(uintptr_t)send_info.addr,
 395                            send_info.len)) {
 396                 vmci_ioctl_err("error getting datagram\n");
 397                 kfree(dg);
 398                 return -EFAULT;
 399         }
 400
 401         pr_devel("Datagram dst (handle=0x%x:0x%x) src (handle=0x%x:0x%x), payload (size=%llu bytes)\n",
 402                  dg->dst.context, dg->dst.resource,
 403                  dg->src.context, dg->src.resource,
 404                  (unsigned long long)dg->payload_size);
 405
 406         /* Get source context id. */
 407         cid = vmci_ctx_get_id(vmci_host_dev->context);
 408         send_info.result = vmci_datagram_dispatch(cid, dg, true);
 409         kfree(dg);
 410
 411         return copy_to_user(uptr, &send_info, sizeof(send_info)) ? -EFAULT : 0;
 412 }
 413
 414 static int vmci_host_do_receive_datagram(struct vmci_host_dev *vmci_host_dev,
 415                                          const char *ioctl_name,
 416                                          void __user *uptr)
 417 {
 418         struct vmci_datagram_snd_rcv_info recv_info;
 419         struct vmci_datagram *dg = NULL;
 420         int retval;
 421         size_t size;
 422
 423         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 424                 vmci_ioctl_err("only valid for contexts\n");
 425                 return -EINVAL;
 426         }
 427
 428         if (copy_from_user(&recv_info, uptr, sizeof(recv_info)))
 429                 return -EFAULT;
 430
 431         size = recv_info.len;
 432         recv_info.result = vmci_ctx_dequeue_datagram(vmci_host_dev->context,
 433                                                      &size, &dg);
 434
 435         if (recv_info.result >= VMCI_SUCCESS) {
 436                 void __user *ubuf = (void __user *)(uintptr_t)recv_info.addr;
 437                 retval = copy_to_user(ubuf, dg, VMCI_DG_SIZE(dg));
 438                 kfree(dg);
 439                 if (retval != 0)
 440                         return -EFAULT;
 441         }
 442
 443         return copy_to_user(uptr, &recv_info, sizeof(recv_info)) ? -EFAULT : 0;
 444 }
 445
 446 static int vmci_host_do_alloc_queuepair(struct vmci_host_dev *vmci_host_dev,
 447                                         const char *ioctl_name,
 448                                         void __user *uptr)
 449 {
 450         struct vmci_handle handle;
 451         int vmci_status;
 452         int __user *retptr;
 453         u32 cid;
 454
 455         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 456                 vmci_ioctl_err("only valid for contexts\n");
 457                 return -EINVAL;
 458         }
 459
 460         cid = vmci_ctx_get_id(vmci_host_dev->context);
 461
 462         if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 463                 struct vmci_qp_alloc_info_vmvm alloc_info;
 464                 struct vmci_qp_alloc_info_vmvm __user *info = uptr;
 465
 466                 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
 467                         return -EFAULT;
 468
 469                 handle = alloc_info.handle;
 470                 retptr = &info->result;
 471
 472                 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
 473                                                 alloc_info.peer,
 474                                                 alloc_info.flags,
 475                                                 VMCI_NO_PRIVILEGE_FLAGS,
 476                                                 alloc_info.produce_size,
 477                                                 alloc_info.consume_size,
 478                                                 NULL,
 479                                                 vmci_host_dev->context);
 480
 481                 if (vmci_status == VMCI_SUCCESS)
 482                         vmci_status = VMCI_SUCCESS_QUEUEPAIR_CREATE;
 483         } else {
 484                 struct vmci_qp_alloc_info alloc_info;
 485                 struct vmci_qp_alloc_info __user *info = uptr;
 486                 struct vmci_qp_page_store page_store;
 487
 488                 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
 489                         return -EFAULT;
 490
 491                 handle = alloc_info.handle;
 492                 retptr = &info->result;
 493
 494                 page_store.pages = alloc_info.ppn_va;
 495                 page_store.len = alloc_info.num_ppns;
 496
 497                 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
 498                                                 alloc_info.peer,
 499                                                 alloc_info.flags,
 500                                                 VMCI_NO_PRIVILEGE_FLAGS,
 501                                                 alloc_info.produce_size,
 502                                                 alloc_info.consume_size,
 503                                                 &page_store,
 504                                                 vmci_host_dev->context);
 505         }
 506
 507         if (put_user(vmci_status, retptr)) {
 508                 if (vmci_status >= VMCI_SUCCESS) {
 509                         vmci_status = vmci_qp_broker_detach(handle,
 510                                                         vmci_host_dev->context);
 511                 }
 512                 return -EFAULT;
 513         }
 514
 515         return 0;
 516 }
 517
 518 static int vmci_host_do_queuepair_setva(struct vmci_host_dev *vmci_host_dev,
 519                                         const char *ioctl_name,
 520                                         void __user *uptr)
 521 {
 522         struct vmci_qp_set_va_info set_va_info;
 523         struct vmci_qp_set_va_info __user *info = uptr;
 524         s32 result;
 525
 526         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 527                 vmci_ioctl_err("only valid for contexts\n");
 528                 return -EINVAL;
 529         }
 530
 531         if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 532                 vmci_ioctl_err("is not allowed\n");
 533                 return -EINVAL;
 534         }
 535
 536         if (copy_from_user(&set_va_info, uptr, sizeof(set_va_info)))
 537                 return -EFAULT;
 538
 539         if (set_va_info.va) {
 540                 /*
 541                  * VMX is passing down a new VA for the queue
 542                  * pair mapping.
 543                  */
 544                 result = vmci_qp_broker_map(set_va_info.handle,
 545                                             vmci_host_dev->context,
 546                                             set_va_info.va);
 547         } else {
 548                 /*
 549                  * The queue pair is about to be unmapped by
 550                  * the VMX.
 551                  */
 552                 result = vmci_qp_broker_unmap(set_va_info.handle,
 553                                          vmci_host_dev->context, 0);
 554         }
 555
 556         return put_user(result, &info->result) ? -EFAULT : 0;
 557 }
 558
 559 static int vmci_host_do_queuepair_setpf(struct vmci_host_dev *vmci_host_dev,
 560                                         const char *ioctl_name,
 561                                         void __user *uptr)
 562 {
 563         struct vmci_qp_page_file_info page_file_info;
 564         struct vmci_qp_page_file_info __user *info = uptr;
 565         s32 result;
 566
 567         if (vmci_host_dev->user_version < VMCI_VERSION_HOSTQP ||
 568             vmci_host_dev->user_version >= VMCI_VERSION_NOVMVM) {
 569                 vmci_ioctl_err("not supported on this VMX (version=%d)\n",
 570                                vmci_host_dev->user_version);
 571                 return -EINVAL;
 572         }
 573
 574         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 575                 vmci_ioctl_err("only valid for contexts\n");
 576                 return -EINVAL;
 577         }
 578
 579         if (copy_from_user(&page_file_info, uptr, sizeof(*info)))
 580                 return -EFAULT;
 581
 582         /*
 583          * Communicate success pre-emptively to the caller.  Note that the
 584          * basic premise is that it is incumbent upon the caller not to look at
 585          * the info.result field until after the ioctl() returns.  And then,
 586          * only if the ioctl() result indicates no error.  We send up the
 587          * SUCCESS status before calling SetPageStore() store because failing
 588          * to copy up the result code means unwinding the SetPageStore().
 589          *
 590          * It turns out the logic to unwind a SetPageStore() opens a can of
 591          * worms.  For example, if a host had created the queue_pair and a
 592          * guest attaches and SetPageStore() is successful but writing success
 593          * fails, then ... the host has to be stopped from writing (anymore)
 594          * data into the queue_pair.  That means an additional test in the
 595          * VMCI_Enqueue() code path.  Ugh.
 596          */
 597
 598         if (put_user(VMCI_SUCCESS, &info->result)) {
 599                 /*
 600                  * In this case, we can't write a result field of the
 601                  * caller's info block.  So, we don't even try to
 602                  * SetPageStore().
 603                  */
 604                 return -EFAULT;
 605         }
 606
 607         result = vmci_qp_broker_set_page_store(page_file_info.handle,
 608                                                 page_file_info.produce_va,
 609                                                 page_file_info.consume_va,
 610                                                 vmci_host_dev->context);
 611         if (result < VMCI_SUCCESS) {
 612                 if (put_user(result, &info->result)) {
 613                         /*
 614                          * Note that in this case the SetPageStore()
 615                          * call failed but we were unable to
 616                          * communicate that to the caller (because the
 617                          * copy_to_user() call failed).  So, if we
 618                          * simply return an error (in this case
 619                          * -EFAULT) then the caller will know that the
 620                          *  SetPageStore failed even though we couldn't
 621                          *  put the result code in the result field and
 622                          *  indicate exactly why it failed.
 623                          *
 624                          * That says nothing about the issue where we
 625                          * were once able to write to the caller's info
 626                          * memory and now can't.  Something more
 627                          * serious is probably going on than the fact
 628                          * that SetPageStore() didn't work.
 629                          */
 630                         return -EFAULT;
 631                 }
 632         }
 633
 634         return 0;
 635 }
 636
 637 static int vmci_host_do_qp_detach(struct vmci_host_dev *vmci_host_dev,
 638                                   const char *ioctl_name,
 639                                   void __user *uptr)
 640 {
 641         struct vmci_qp_dtch_info detach_info;
 642         struct vmci_qp_dtch_info __user *info = uptr;
 643         s32 result;
 644
 645         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 646                 vmci_ioctl_err("only valid for contexts\n");
 647                 return -EINVAL;
 648         }
 649
 650         if (copy_from_user(&detach_info, uptr, sizeof(detach_info)))
 651                 return -EFAULT;
 652
 653         result = vmci_qp_broker_detach(detach_info.handle,
 654                                        vmci_host_dev->context);
 655         if (result == VMCI_SUCCESS &&
 656             vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 657                 result = VMCI_SUCCESS_LAST_DETACH;
 658         }
 659
 660         return put_user(result, &info->result) ? -EFAULT : 0;
 661 }
 662
 663 static int vmci_host_do_ctx_add_notify(struct vmci_host_dev *vmci_host_dev,
 664                                        const char *ioctl_name,
 665                                        void __user *uptr)
 666 {
 667         struct vmci_ctx_info ar_info;
 668         struct vmci_ctx_info __user *info = uptr;
 669         s32 result;
 670         u32 cid;
 671
 672         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 673                 vmci_ioctl_err("only valid for contexts\n");
 674                 return -EINVAL;
 675         }
 676
 677         if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
 678                 return -EFAULT;
 679
 680         cid = vmci_ctx_get_id(vmci_host_dev->context);
 681         result = vmci_ctx_add_notification(cid, ar_info.remote_cid);
 682
 683         return put_user(result, &info->result) ? -EFAULT : 0;
 684 }
 685
 686 static int vmci_host_do_ctx_remove_notify(struct vmci_host_dev *vmci_host_dev,
 687                                           const char *ioctl_name,
 688                                           void __user *uptr)
 689 {
 690         struct vmci_ctx_info ar_info;
 691         struct vmci_ctx_info __user *info = uptr;
 692         u32 cid;
 693         int result;
 694
 695         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 696                 vmci_ioctl_err("only valid for contexts\n");
 697                 return -EINVAL;
 698         }
 699
 700         if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
 701                 return -EFAULT;
 702
 703         cid = vmci_ctx_get_id(vmci_host_dev->context);
 704         result = vmci_ctx_remove_notification(cid,
 705                                               ar_info.remote_cid);
 706
 707         return put_user(result, &info->result) ? -EFAULT : 0;
 708 }
 709
 710 static int vmci_host_do_ctx_get_cpt_state(struct vmci_host_dev *vmci_host_dev,
 711                                           const char *ioctl_name,
 712                                           void __user *uptr)
 713 {
 714         struct vmci_ctx_chkpt_buf_info get_info;
 715         u32 cid;
 716         void *cpt_buf;
 717         int retval;
 718
 719         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 720                 vmci_ioctl_err("only valid for contexts\n");
 721                 return -EINVAL;
 722         }
 723
 724         if (copy_from_user(&get_info, uptr, sizeof(get_info)))
 725                 return -EFAULT;
 726
 727         cid = vmci_ctx_get_id(vmci_host_dev->context);
 728         get_info.result = vmci_ctx_get_chkpt_state(cid, get_info.cpt_type,
 729                                                 &get_info.buf_size, &cpt_buf);
 730         if (get_info.result == VMCI_SUCCESS && get_info.buf_size) {
 731                 void __user *ubuf = (void __user *)(uintptr_t)get_info.cpt_buf;
 732                 retval = copy_to_user(ubuf, cpt_buf, get_info.buf_size);
 733                 kfree(cpt_buf);
 734
 735                 if (retval)
 736                         return -EFAULT;
 737         }
 738
 739         return copy_to_user(uptr, &get_info, sizeof(get_info)) ? -EFAULT : 0;
 740 }
 741
 742 static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,
 743                                           const char *ioctl_name,
 744                                           void __user *uptr)
 745 {
 746         struct vmci_ctx_chkpt_buf_info set_info;
 747         u32 cid;
 748         void *cpt_buf;
 749         int retval;
 750
 751         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 752                 vmci_ioctl_err("only valid for contexts\n");
 753                 return -EINVAL;
 754         }
 755
 756         if (copy_from_user(&set_info, uptr, sizeof(set_info)))
 757                 return -EFAULT;
 758
 759         cpt_buf = kmalloc(set_info.buf_size, GFP_KERNEL);
 760         if (!cpt_buf) {
 761                 vmci_ioctl_err(
 762                         "cannot allocate memory to set cpt state (type=%d)\n",
 763                         set_info.cpt_type);
 764                 return -ENOMEM;
 765         }
 766
 767         if (copy_from_user(cpt_buf, (void __user *)(uintptr_t)set_info.cpt_buf,
 768                            set_info.buf_size)) {
 769                 retval = -EFAULT;
 770                 goto out;
 771         }
 772
 773         cid = vmci_ctx_get_id(vmci_host_dev->context);
 774         set_info.result = vmci_ctx_set_chkpt_state(cid, set_info.cpt_type,
 775                                                    set_info.buf_size, cpt_buf);
 776
 777         retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;
 778
 779 out:
 780         kfree(cpt_buf);
 781         return retval;
 782 }
 783
 784 static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev,
 785                                        const char *ioctl_name,
 786                                        void __user *uptr)
 787 {
 788         u32 __user *u32ptr = uptr;
 789
 790         return put_user(VMCI_HOST_CONTEXT_ID, u32ptr) ? -EFAULT : 0;
 791 }
 792
 793 static int vmci_host_do_set_notify(struct vmci_host_dev *vmci_host_dev,
 794                                    const char *ioctl_name,
 795                                    void __user *uptr)
 796 {
 797         struct vmci_set_notify_info notify_info;
 798
 799         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 800                 vmci_ioctl_err("only valid for contexts\n");
 801                 return -EINVAL;
 802         }
 803
 804         if (copy_from_user(&notify_info, uptr, sizeof(notify_info)))
 805                 return -EFAULT;
 806
 807         if (notify_info.notify_uva) {
 808                 notify_info.result =
 809                         vmci_host_setup_notify(vmci_host_dev->context,
 810                                                notify_info.notify_uva);
 811         } else {
 812                 vmci_ctx_unset_notify(vmci_host_dev->context);
 813                 notify_info.result = VMCI_SUCCESS;
 814         }
 815
 816         return copy_to_user(uptr, &notify_info, sizeof(notify_info)) ?
 817                 -EFAULT : 0;
 818 }
 819
 820 static int vmci_host_do_notify_resource(struct vmci_host_dev *vmci_host_dev,
 821                                         const char *ioctl_name,
 822                                         void __user *uptr)
 823 {
 824         struct vmci_dbell_notify_resource_info info;
 825         u32 cid;
 826
 827         if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
 828                 vmci_ioctl_err("invalid for current VMX versions\n");
 829                 return -EINVAL;
 830         }
 831
 832         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 833                 vmci_ioctl_err("only valid for contexts\n");
 834                 return -EINVAL;
 835         }
 836
 837         if (copy_from_user(&info, uptr, sizeof(info)))
 838                 return -EFAULT;
 839
 840         cid = vmci_ctx_get_id(vmci_host_dev->context);
 841
 842         switch (info.action) {
 843         case VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY:
 844                 if (info.resource == VMCI_NOTIFY_RESOURCE_DOOR_BELL) {
 845                         u32 flags = VMCI_NO_PRIVILEGE_FLAGS;
 846                         info.result = vmci_ctx_notify_dbell(cid, info.handle,
 847                                                             flags);
 848                 } else {
 849                         info.result = VMCI_ERROR_UNAVAILABLE;
 850                 }
 851                 break;
 852
 853         case VMCI_NOTIFY_RESOURCE_ACTION_CREATE:
 854                 info.result = vmci_ctx_dbell_create(cid, info.handle);
 855                 break;
 856
 857         case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY:
 858                 info.result = vmci_ctx_dbell_destroy(cid, info.handle);
 859                 break;
 860
 861         default:
 862                 vmci_ioctl_err("got unknown action (action=%d)\n",
 863                                info.action);
 864                 info.result = VMCI_ERROR_INVALID_ARGS;
 865         }
 866
 867         return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
 868 }
 869
 870 static int vmci_host_do_recv_notifications(struct vmci_host_dev *vmci_host_dev,
 871                                            const char *ioctl_name,
 872                                            void __user *uptr)
 873 {
 874         struct vmci_ctx_notify_recv_info info;
 875         struct vmci_handle_arr *db_handle_array;
 876         struct vmci_handle_arr *qp_handle_array;
 877         void __user *ubuf;
 878         u32 cid;
 879         int retval = 0;
 880
 881         if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 882                 vmci_ioctl_err("only valid for contexts\n");
 883                 return -EINVAL;
 884         }
 885
 886         if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
 887                 vmci_ioctl_err("not supported for the current vmx version\n");
 888                 return -EINVAL;
 889         }
 890
 891         if (copy_from_user(&info, uptr, sizeof(info)))
 892                 return -EFAULT;
 893
 894         if ((info.db_handle_buf_size && !info.db_handle_buf_uva) ||
 895             (info.qp_handle_buf_size && !info.qp_handle_buf_uva)) {
 896                 return -EINVAL;
 897         }
 898
 899         cid = vmci_ctx_get_id(vmci_host_dev->context);
 900
 901         info.result = vmci_ctx_rcv_notifications_get(cid,
 902                                 &db_handle_array, &qp_handle_array);
 903         if (info.result != VMCI_SUCCESS)
 904                 return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
 905
 906         ubuf = (void __user *)(uintptr_t)info.db_handle_buf_uva;
 907         info.result = drv_cp_harray_to_user(ubuf, &info.db_handle_buf_size,
 908                                             db_handle_array, &retval);
 909         if (info.result == VMCI_SUCCESS && !retval) {
 910                 ubuf = (void __user *)(uintptr_t)info.qp_handle_buf_uva;
 911                 info.result = drv_cp_harray_to_user(ubuf,
 912                                                     &info.qp_handle_buf_size,
 913                                                     qp_handle_array, &retval);
 914         }
 915
 916         if (!retval && copy_to_user(uptr, &info, sizeof(info)))
 917                 retval = -EFAULT;
 918
 919         vmci_ctx_rcv_notifications_release(cid,
 920                                 db_handle_array, qp_handle_array,
 921                                 info.result == VMCI_SUCCESS && !retval);
 922
 923         return retval;
 924 }
 925
 926 static long vmci_host_unlocked_ioctl(struct file *filp,
 927                                      unsigned int iocmd, unsigned long ioarg)
 928 {
 929 #define VMCI_DO_IOCTL(ioctl_name, ioctl_fn) do {                        \
 930                 char *name = __stringify(IOCTL_VMCI_ ## ioctl_name);    \
 931                 return vmci_host_do_ ## ioctl_fn(                       \
 932                         vmci_host_dev, name, uptr);                     \
 933         } while (0)
 934
 935         struct vmci_host_dev *vmci_host_dev = filp->private_data;
 936         void __user *uptr = (void __user *)ioarg;
 937
 938         switch (iocmd) {
 939         case IOCTL_VMCI_INIT_CONTEXT:
 940                 VMCI_DO_IOCTL(INIT_CONTEXT, init_context);
 941         case IOCTL_VMCI_DATAGRAM_SEND:
 942                 VMCI_DO_IOCTL(DATAGRAM_SEND, send_datagram);
 943         case IOCTL_VMCI_DATAGRAM_RECEIVE:
 944                 VMCI_DO_IOCTL(DATAGRAM_RECEIVE, receive_datagram);
 945         case IOCTL_VMCI_QUEUEPAIR_ALLOC:
 946                 VMCI_DO_IOCTL(QUEUEPAIR_ALLOC, alloc_queuepair);
 947         case IOCTL_VMCI_QUEUEPAIR_SETVA:
 948                 VMCI_DO_IOCTL(QUEUEPAIR_SETVA, queuepair_setva);
 949         case IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE:
 950                 VMCI_DO_IOCTL(QUEUEPAIR_SETPAGEFILE, queuepair_setpf);
 951         case IOCTL_VMCI_QUEUEPAIR_DETACH:
 952                 VMCI_DO_IOCTL(QUEUEPAIR_DETACH, qp_detach);
 953         case IOCTL_VMCI_CTX_ADD_NOTIFICATION:
 954                 VMCI_DO_IOCTL(CTX_ADD_NOTIFICATION, ctx_add_notify);
 955         case IOCTL_VMCI_CTX_REMOVE_NOTIFICATION:
 956                 VMCI_DO_IOCTL(CTX_REMOVE_NOTIFICATION, ctx_remove_notify);
 957         case IOCTL_VMCI_CTX_GET_CPT_STATE:
 958                 VMCI_DO_IOCTL(CTX_GET_CPT_STATE, ctx_get_cpt_state);
 959         case IOCTL_VMCI_CTX_SET_CPT_STATE:
 960                 VMCI_DO_IOCTL(CTX_SET_CPT_STATE, ctx_set_cpt_state);
 961         case IOCTL_VMCI_GET_CONTEXT_ID:
 962                 VMCI_DO_IOCTL(GET_CONTEXT_ID, get_context_id);
 963         case IOCTL_VMCI_SET_NOTIFY:
 964                 VMCI_DO_IOCTL(SET_NOTIFY, set_notify);
 965         case IOCTL_VMCI_NOTIFY_RESOURCE:
 966                 VMCI_DO_IOCTL(NOTIFY_RESOURCE, notify_resource);
 967         case IOCTL_VMCI_NOTIFICATIONS_RECEIVE:
 968                 VMCI_DO_IOCTL(NOTIFICATIONS_RECEIVE, recv_notifications);
 969
 970         case IOCTL_VMCI_VERSION:
 971         case IOCTL_VMCI_VERSION2:
 972                 return vmci_host_get_version(vmci_host_dev, iocmd, uptr);
 973
 974         default:
 975                 pr_devel("%s: Unknown ioctl (iocmd=%d)\n", __func__, iocmd);
 976                 return -EINVAL;
 977         }
 978
 979 #undef VMCI_DO_IOCTL
 980 }
 981
 982 static const struct file_operations vmuser_fops = {
 983         .owner          = THIS_MODULE,
 984         .open           = vmci_host_open,
 985         .release        = vmci_host_close,
 986         .poll           = vmci_host_poll,
 987         .unlocked_ioctl = vmci_host_unlocked_ioctl,
 988         .compat_ioctl   = vmci_host_unlocked_ioctl,
 989 };
 990
 991 static struct miscdevice vmci_host_miscdev = {
 992          .name = "vmci",
 993          .minor = MISC_DYNAMIC_MINOR,
 994          .fops = &vmuser_fops,
 995 };
 996
 997 int __init vmci_host_init(void)
 998 {
 999         int error;
1000
1001         host_context = vmci_ctx_create(VMCI_HOST_CONTEXT_ID,
1002                                         VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS,
1003                                         -1, VMCI_VERSION, NULL);
1004         if (IS_ERR(host_context)) {
1005                 error = PTR_ERR(host_context);
1006                 pr_warn("Failed to initialize VMCIContext (error%d)\n",
1007                         error);
1008                 return error;
1009         }
1010
1011         error = misc_register(&vmci_host_miscdev);
1012         if (error) {
1013                 pr_warn("Module registration error (name=%s, major=%d, minor=%d, err=%d)\n",
1014                         vmci_host_miscdev.name,
1015                         MISC_MAJOR, vmci_host_miscdev.minor,
1016                         error);
1017                 pr_warn("Unable to initialize host personality\n");
1018                 vmci_ctx_destroy(host_context);
1019                 return error;
1020         }
1021
1022         pr_info("VMCI host device registered (name=%s, major=%d, minor=%d)\n",
1023                 vmci_host_miscdev.name, MISC_MAJOR, vmci_host_miscdev.minor);
1024
1025         vmci_host_device_initialized = true;
1026         return 0;
1027 }
1028
1029 void __exit vmci_host_exit(void)
1030 {
1031         int error;
1032
1033         vmci_host_device_initialized = false;
1034
1035         error = misc_deregister(&vmci_host_miscdev);
1036         if (error)
1037                 pr_warn("Error unregistering character device: %d\n", error);
1038
1039         vmci_ctx_destroy(host_context);
1040         vmci_qp_broker_exit();
1041
1042         pr_debug("VMCI host driver module unloaded\n");
1043 }