drivers/virt/vboxguest/vboxguest_utils.c

   1 /* SPDX-License-Identifier: (GPL-2.0 OR CDDL-1.0) */
   2 /*
   3  * vboxguest vmm-req and hgcm-call code, VBoxGuestR0LibHGCMInternal.cpp,
   4  * VBoxGuestR0LibGenericRequest.cpp and RTErrConvertToErrno.cpp in vbox svn.
   5  *
   6  * Copyright (C) 2006-2016 Oracle Corporation
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/kernel.h>
  11 #include <linux/mm.h>
  12 #include <linux/module.h>
  13 #include <linux/sizes.h>
  14 #include <linux/slab.h>
  15 #include <linux/uaccess.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/vbox_err.h>
  18 #include <linux/vbox_utils.h>
  19 #include "vboxguest_core.h"
  20
  21 /* Get the pointer to the first parameter of a HGCM call request. */
  22 #define VMMDEV_HGCM_CALL_PARMS(a) \
  23         ((struct vmmdev_hgcm_function_parameter *)( \
  24                 (u8 *)(a) + sizeof(struct vmmdev_hgcm_call)))
  25
  26 /* The max parameter buffer size for a user request. */
  27 #define VBG_MAX_HGCM_USER_PARM          (24 * SZ_1M)
  28 /* The max parameter buffer size for a kernel request. */
  29 #define VBG_MAX_HGCM_KERNEL_PARM        (16 * SZ_1M)
  30
  31 #define VBG_DEBUG_PORT                  0x504
  32
  33 /* This protects vbg_log_buf and serializes VBG_DEBUG_PORT accesses */
  34 static DEFINE_SPINLOCK(vbg_log_lock);
  35 static char vbg_log_buf[128];
  36
  37 #define VBG_LOG(name, pr_func) \
  38 void name(const char *fmt, ...)                                         \
  39 {                                                                       \
  40         unsigned long flags;                                            \
  41         va_list args;                                                   \
  42         int i, count;                                                   \
  43                                                                         \
  44         va_start(args, fmt);                                            \
  45         spin_lock_irqsave(&vbg_log_lock, flags);                        \
  46                                                                         \
  47         count = vscnprintf(vbg_log_buf, sizeof(vbg_log_buf), fmt, args);\
  48         for (i = 0; i < count; i++)                                     \
  49                 outb(vbg_log_buf[i], VBG_DEBUG_PORT);                   \
  50                                                                         \
  51         pr_func("%s", vbg_log_buf);                                     \
  52                                                                         \
  53         spin_unlock_irqrestore(&vbg_log_lock, flags);                   \
  54         va_end(args);                                                   \
  55 }                                                                       \
  56 EXPORT_SYMBOL(name)
  57
  58 VBG_LOG(vbg_info, pr_info);
  59 VBG_LOG(vbg_warn, pr_warn);
  60 VBG_LOG(vbg_err, pr_err);
  61 #if defined(DEBUG) && !defined(CONFIG_DYNAMIC_DEBUG)
  62 VBG_LOG(vbg_debug, pr_debug);
  63 #endif
  64
  65 void *vbg_req_alloc(size_t len, enum vmmdev_request_type req_type)
  66 {
  67         struct vmmdev_request_header *req;
  68         int order = get_order(PAGE_ALIGN(len));
  69
  70         req = (void *)__get_free_pages(GFP_KERNEL | GFP_DMA32, order);
  71         if (!req)
  72                 return NULL;
  73
  74         memset(req, 0xaa, len);
  75
  76         req->size = len;
  77         req->version = VMMDEV_REQUEST_HEADER_VERSION;
  78         req->request_type = req_type;
  79         req->rc = VERR_GENERAL_FAILURE;
  80         req->reserved1 = 0;
  81         req->reserved2 = 0;
  82
  83         return req;
  84 }
  85
  86 void vbg_req_free(void *req, size_t len)
  87 {
  88         if (!req)
  89                 return;
  90
  91         free_pages((unsigned long)req, get_order(PAGE_ALIGN(len)));
  92 }
  93
  94 /* Note this function returns a VBox status code, not a negative errno!! */
  95 int vbg_req_perform(struct vbg_dev *gdev, void *req)
  96 {
  97         unsigned long phys_req = virt_to_phys(req);
  98
  99         outl(phys_req, gdev->io_port + VMMDEV_PORT_OFF_REQUEST);
 100         /*
 101          * The host changes the request as a result of the outl, make sure
 102          * the outl and any reads of the req happen in the correct order.
 103          */
 104         mb();
 105
 106         return ((struct vmmdev_request_header *)req)->rc;
 107 }
 108
 109 static bool hgcm_req_done(struct vbg_dev *gdev,
 110                           struct vmmdev_hgcmreq_header *header)
 111 {
 112         unsigned long flags;
 113         bool done;
 114
 115         spin_lock_irqsave(&gdev->event_spinlock, flags);
 116         done = header->flags & VMMDEV_HGCM_REQ_DONE;
 117         spin_unlock_irqrestore(&gdev->event_spinlock, flags);
 118
 119         return done;
 120 }
 121
 122 int vbg_hgcm_connect(struct vbg_dev *gdev,
 123                      struct vmmdev_hgcm_service_location *loc,
 124                      u32 *client_id, int *vbox_status)
 125 {
 126         struct vmmdev_hgcm_connect *hgcm_connect = NULL;
 127         int rc;
 128
 129         hgcm_connect = vbg_req_alloc(sizeof(*hgcm_connect),
 130                                      VMMDEVREQ_HGCM_CONNECT);
 131         if (!hgcm_connect)
 132                 return -ENOMEM;
 133
 134         hgcm_connect->header.flags = 0;
 135         memcpy(&hgcm_connect->loc, loc, sizeof(*loc));
 136         hgcm_connect->client_id = 0;
 137
 138         rc = vbg_req_perform(gdev, hgcm_connect);
 139
 140         if (rc == VINF_HGCM_ASYNC_EXECUTE)
 141                 wait_event(gdev->hgcm_wq,
 142                            hgcm_req_done(gdev, &hgcm_connect->header));
 143
 144         if (rc >= 0) {
 145                 *client_id = hgcm_connect->client_id;
 146                 rc = hgcm_connect->header.result;
 147         }
 148
 149         vbg_req_free(hgcm_connect, sizeof(*hgcm_connect));
 150
 151         *vbox_status = rc;
 152         return 0;
 153 }
 154 EXPORT_SYMBOL(vbg_hgcm_connect);
 155
 156 int vbg_hgcm_disconnect(struct vbg_dev *gdev, u32 client_id, int *vbox_status)
 157 {
 158         struct vmmdev_hgcm_disconnect *hgcm_disconnect = NULL;
 159         int rc;
 160
 161         hgcm_disconnect = vbg_req_alloc(sizeof(*hgcm_disconnect),
 162                                         VMMDEVREQ_HGCM_DISCONNECT);
 163         if (!hgcm_disconnect)
 164                 return -ENOMEM;
 165
 166         hgcm_disconnect->header.flags = 0;
 167         hgcm_disconnect->client_id = client_id;
 168
 169         rc = vbg_req_perform(gdev, hgcm_disconnect);
 170
 171         if (rc == VINF_HGCM_ASYNC_EXECUTE)
 172                 wait_event(gdev->hgcm_wq,
 173                            hgcm_req_done(gdev, &hgcm_disconnect->header));
 174
 175         if (rc >= 0)
 176                 rc = hgcm_disconnect->header.result;
 177
 178         vbg_req_free(hgcm_disconnect, sizeof(*hgcm_disconnect));
 179
 180         *vbox_status = rc;
 181         return 0;
 182 }
 183 EXPORT_SYMBOL(vbg_hgcm_disconnect);
 184
 185 static u32 hgcm_call_buf_size_in_pages(void *buf, u32 len)
 186 {
 187         u32 size = PAGE_ALIGN(len + ((unsigned long)buf & ~PAGE_MASK));
 188
 189         return size >> PAGE_SHIFT;
 190 }
 191
 192 static void hgcm_call_add_pagelist_size(void *buf, u32 len, size_t *extra)
 193 {
 194         u32 page_count;
 195
 196         page_count = hgcm_call_buf_size_in_pages(buf, len);
 197         *extra += offsetof(struct vmmdev_hgcm_pagelist, pages[page_count]);
 198 }
 199
 200 static int hgcm_call_preprocess_linaddr(
 201         const struct vmmdev_hgcm_function_parameter *src_parm,
 202         void **bounce_buf_ret, size_t *extra)
 203 {
 204         void *buf, *bounce_buf;
 205         bool copy_in;
 206         u32 len;
 207         int ret;
 208
 209         buf = (void *)src_parm->u.pointer.u.linear_addr;
 210         len = src_parm->u.pointer.size;
 211         copy_in = src_parm->type != VMMDEV_HGCM_PARM_TYPE_LINADDR_OUT;
 212
 213         if (len > VBG_MAX_HGCM_USER_PARM)
 214                 return -E2BIG;
 215
 216         bounce_buf = kvmalloc(len, GFP_KERNEL);
 217         if (!bounce_buf)
 218                 return -ENOMEM;
 219
 220         *bounce_buf_ret = bounce_buf;
 221
 222         if (copy_in) {
 223                 ret = copy_from_user(bounce_buf, (void __user *)buf, len);
 224                 if (ret)
 225                         return -EFAULT;
 226         } else {
 227                 memset(bounce_buf, 0, len);
 228         }
 229
 230         hgcm_call_add_pagelist_size(bounce_buf, len, extra);
 231         return 0;
 232 }
 233
 234 /**
 235  * Preprocesses the HGCM call, validate parameters, alloc bounce buffers and
 236  * figure out how much extra storage we need for page lists.
 237  * Return: 0 or negative errno value.
 238  * @src_parm:         Pointer to source function call parameters
 239  * @parm_count:       Number of function call parameters.
 240  * @bounce_bufs_ret:  Where to return the allocated bouncebuffer array
 241  * @extra:            Where to return the extra request space needed for
 242  *                    physical page lists.
 243  */
 244 static int hgcm_call_preprocess(
 245         const struct vmmdev_hgcm_function_parameter *src_parm,
 246         u32 parm_count, void ***bounce_bufs_ret, size_t *extra)
 247 {
 248         void *buf, **bounce_bufs = NULL;
 249         u32 i, len;
 250         int ret;
 251
 252         for (i = 0; i < parm_count; i++, src_parm++) {
 253                 switch (src_parm->type) {
 254                 case VMMDEV_HGCM_PARM_TYPE_32BIT:
 255                 case VMMDEV_HGCM_PARM_TYPE_64BIT:
 256                         break;
 257
 258                 case VMMDEV_HGCM_PARM_TYPE_LINADDR:
 259                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_IN:
 260                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_OUT:
 261                         if (!bounce_bufs) {
 262                                 bounce_bufs = kcalloc(parm_count,
 263                                                       sizeof(void *),
 264                                                       GFP_KERNEL);
 265                                 if (!bounce_bufs)
 266                                         return -ENOMEM;
 267
 268                                 *bounce_bufs_ret = bounce_bufs;
 269                         }
 270
 271                         ret = hgcm_call_preprocess_linaddr(src_parm,
 272                                                            &bounce_bufs[i],
 273                                                            extra);
 274                         if (ret)
 275                                 return ret;
 276
 277                         break;
 278
 279                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL:
 280                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN:
 281                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT:
 282                         buf = (void *)src_parm->u.pointer.u.linear_addr;
 283                         len = src_parm->u.pointer.size;
 284                         if (WARN_ON(len > VBG_MAX_HGCM_KERNEL_PARM))
 285                                 return -E2BIG;
 286
 287                         hgcm_call_add_pagelist_size(buf, len, extra);
 288                         break;
 289
 290                 default:
 291                         return -EINVAL;
 292                 }
 293         }
 294
 295         return 0;
 296 }
 297
 298 /**
 299  * Translates linear address types to page list direction flags.
 300  *
 301  * Return: page list flags.
 302  * @type:  The type.
 303  */
 304 static u32 hgcm_call_linear_addr_type_to_pagelist_flags(
 305         enum vmmdev_hgcm_function_parameter_type type)
 306 {
 307         switch (type) {
 308         default:
 309                 WARN_ON(1);
 310                 /* Fall through */
 311         case VMMDEV_HGCM_PARM_TYPE_LINADDR:
 312         case VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL:
 313                 return VMMDEV_HGCM_F_PARM_DIRECTION_BOTH;
 314
 315         case VMMDEV_HGCM_PARM_TYPE_LINADDR_IN:
 316         case VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN:
 317                 return VMMDEV_HGCM_F_PARM_DIRECTION_TO_HOST;
 318
 319         case VMMDEV_HGCM_PARM_TYPE_LINADDR_OUT:
 320         case VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT:
 321                 return VMMDEV_HGCM_F_PARM_DIRECTION_FROM_HOST;
 322         }
 323 }
 324
 325 static void hgcm_call_init_linaddr(struct vmmdev_hgcm_call *call,
 326         struct vmmdev_hgcm_function_parameter *dst_parm, void *buf, u32 len,
 327         enum vmmdev_hgcm_function_parameter_type type, u32 *off_extra)
 328 {
 329         struct vmmdev_hgcm_pagelist *dst_pg_lst;
 330         struct page *page;
 331         bool is_vmalloc;
 332         u32 i, page_count;
 333
 334         dst_parm->type = type;
 335
 336         if (len == 0) {
 337                 dst_parm->u.pointer.size = 0;
 338                 dst_parm->u.pointer.u.linear_addr = 0;
 339                 return;
 340         }
 341
 342         dst_pg_lst = (void *)call + *off_extra;
 343         page_count = hgcm_call_buf_size_in_pages(buf, len);
 344         is_vmalloc = is_vmalloc_addr(buf);
 345
 346         dst_parm->type = VMMDEV_HGCM_PARM_TYPE_PAGELIST;
 347         dst_parm->u.page_list.size = len;
 348         dst_parm->u.page_list.offset = *off_extra;
 349         dst_pg_lst->flags = hgcm_call_linear_addr_type_to_pagelist_flags(type);
 350         dst_pg_lst->offset_first_page = (unsigned long)buf & ~PAGE_MASK;
 351         dst_pg_lst->page_count = page_count;
 352
 353         for (i = 0; i < page_count; i++) {
 354                 if (is_vmalloc)
 355                         page = vmalloc_to_page(buf);
 356                 else
 357                         page = virt_to_page(buf);
 358
 359                 dst_pg_lst->pages[i] = page_to_phys(page);
 360                 buf += PAGE_SIZE;
 361         }
 362
 363         *off_extra += offsetof(struct vmmdev_hgcm_pagelist, pages[page_count]);
 364 }
 365
 366 /**
 367  * Initializes the call request that we're sending to the host.
 368  * @call:            The call to initialize.
 369  * @client_id:       The client ID of the caller.
 370  * @function:        The function number of the function to call.
 371  * @src_parm:        Pointer to source function call parameters.
 372  * @parm_count:      Number of function call parameters.
 373  * @bounce_bufs:     The bouncebuffer array.
 374  */
 375 static void hgcm_call_init_call(
 376         struct vmmdev_hgcm_call *call, u32 client_id, u32 function,
 377         const struct vmmdev_hgcm_function_parameter *src_parm,
 378         u32 parm_count, void **bounce_bufs)
 379 {
 380         struct vmmdev_hgcm_function_parameter *dst_parm =
 381                 VMMDEV_HGCM_CALL_PARMS(call);
 382         u32 i, off_extra = (uintptr_t)(dst_parm + parm_count) - (uintptr_t)call;
 383         void *buf;
 384
 385         call->header.flags = 0;
 386         call->header.result = VINF_SUCCESS;
 387         call->client_id = client_id;
 388         call->function = function;
 389         call->parm_count = parm_count;
 390
 391         for (i = 0; i < parm_count; i++, src_parm++, dst_parm++) {
 392                 switch (src_parm->type) {
 393                 case VMMDEV_HGCM_PARM_TYPE_32BIT:
 394                 case VMMDEV_HGCM_PARM_TYPE_64BIT:
 395                         *dst_parm = *src_parm;
 396                         break;
 397
 398                 case VMMDEV_HGCM_PARM_TYPE_LINADDR:
 399                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_IN:
 400                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_OUT:
 401                         hgcm_call_init_linaddr(call, dst_parm, bounce_bufs[i],
 402                                                src_parm->u.pointer.size,
 403                                                src_parm->type, &off_extra);
 404                         break;
 405
 406                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL:
 407                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN:
 408                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT:
 409                         buf = (void *)src_parm->u.pointer.u.linear_addr;
 410                         hgcm_call_init_linaddr(call, dst_parm, buf,
 411                                                src_parm->u.pointer.size,
 412                                                src_parm->type, &off_extra);
 413                         break;
 414
 415                 default:
 416                         WARN_ON(1);
 417                         dst_parm->type = VMMDEV_HGCM_PARM_TYPE_INVALID;
 418                 }
 419         }
 420 }
 421
 422 /**
 423  * Tries to cancel a pending HGCM call.
 424  *
 425  * Return: VBox status code
 426  */
 427 static int hgcm_cancel_call(struct vbg_dev *gdev, struct vmmdev_hgcm_call *call)
 428 {
 429         int rc;
 430
 431         /*
 432          * We use a pre-allocated request for cancellations, which is
 433          * protected by cancel_req_mutex. This means that all cancellations
 434          * get serialized, this should be fine since they should be rare.
 435          */
 436         mutex_lock(&gdev->cancel_req_mutex);
 437         gdev->cancel_req->phys_req_to_cancel = virt_to_phys(call);
 438         rc = vbg_req_perform(gdev, gdev->cancel_req);
 439         mutex_unlock(&gdev->cancel_req_mutex);
 440
 441         if (rc == VERR_NOT_IMPLEMENTED) {
 442                 call->header.flags |= VMMDEV_HGCM_REQ_CANCELLED;
 443                 call->header.header.request_type = VMMDEVREQ_HGCM_CANCEL;
 444
 445                 rc = vbg_req_perform(gdev, call);
 446                 if (rc == VERR_INVALID_PARAMETER)
 447                         rc = VERR_NOT_FOUND;
 448         }
 449
 450         if (rc >= 0)
 451                 call->header.flags |= VMMDEV_HGCM_REQ_CANCELLED;
 452
 453         return rc;
 454 }
 455
 456 /**
 457  * Performs the call and completion wait.
 458  * Return: 0 or negative errno value.
 459  * @gdev:        The VBoxGuest device extension.
 460  * @call:        The call to execute.
 461  * @timeout_ms:  Timeout in ms.
 462  * @leak_it:     Where to return the leak it / free it, indicator.
 463  *               Cancellation fun.
 464  */
 465 static int vbg_hgcm_do_call(struct vbg_dev *gdev, struct vmmdev_hgcm_call *call,
 466                             u32 timeout_ms, bool *leak_it)
 467 {
 468         int rc, cancel_rc, ret;
 469         long timeout;
 470
 471         *leak_it = false;
 472
 473         rc = vbg_req_perform(gdev, call);
 474
 475         /*
 476          * If the call failed, then pretend success. Upper layers will
 477          * interpret the result code in the packet.
 478          */
 479         if (rc < 0) {
 480                 call->header.result = rc;
 481                 return 0;
 482         }
 483
 484         if (rc != VINF_HGCM_ASYNC_EXECUTE)
 485                 return 0;
 486
 487         /* Host decided to process the request asynchronously, wait for it */
 488         if (timeout_ms == U32_MAX)
 489                 timeout = MAX_SCHEDULE_TIMEOUT;
 490         else
 491                 timeout = msecs_to_jiffies(timeout_ms);
 492
 493         timeout = wait_event_interruptible_timeout(
 494                                         gdev->hgcm_wq,
 495                                         hgcm_req_done(gdev, &call->header),
 496                                         timeout);
 497
 498         /* timeout > 0 means hgcm_req_done has returned true, so success */
 499         if (timeout > 0)
 500                 return 0;
 501
 502         if (timeout == 0)
 503                 ret = -ETIMEDOUT;
 504         else
 505                 ret = -EINTR;
 506
 507         /* Cancel the request */
 508         cancel_rc = hgcm_cancel_call(gdev, call);
 509         if (cancel_rc >= 0)
 510                 return ret;
 511
 512         /*
 513          * Failed to cancel, this should mean that the cancel has lost the
 514          * race with normal completion, wait while the host completes it.
 515          */
 516         if (cancel_rc == VERR_NOT_FOUND || cancel_rc == VERR_SEM_DESTROYED)
 517                 timeout = msecs_to_jiffies(500);
 518         else
 519                 timeout = msecs_to_jiffies(2000);
 520
 521         timeout = wait_event_timeout(gdev->hgcm_wq,
 522                                      hgcm_req_done(gdev, &call->header),
 523                                      timeout);
 524
 525         if (WARN_ON(timeout == 0)) {
 526                 /* We really should never get here */
 527                 vbg_err("%s: Call timedout and cancellation failed, leaking the request\n",
 528                         __func__);
 529                 *leak_it = true;
 530                 return ret;
 531         }
 532
 533         /* The call has completed normally after all */
 534         return 0;
 535 }
 536
 537 /**
 538  * Copies the result of the call back to the caller info structure and user
 539  * buffers.
 540  * Return: 0 or negative errno value.
 541  * @call:            HGCM call request.
 542  * @dst_parm:        Pointer to function call parameters destination.
 543  * @parm_count:      Number of function call parameters.
 544  * @bounce_bufs:     The bouncebuffer array.
 545  */
 546 static int hgcm_call_copy_back_result(
 547         const struct vmmdev_hgcm_call *call,
 548         struct vmmdev_hgcm_function_parameter *dst_parm,
 549         u32 parm_count, void **bounce_bufs)
 550 {
 551         const struct vmmdev_hgcm_function_parameter *src_parm =
 552                 VMMDEV_HGCM_CALL_PARMS(call);
 553         void __user *p;
 554         int ret;
 555         u32 i;
 556
 557         /* Copy back parameters. */
 558         for (i = 0; i < parm_count; i++, src_parm++, dst_parm++) {
 559                 switch (dst_parm->type) {
 560                 case VMMDEV_HGCM_PARM_TYPE_32BIT:
 561                 case VMMDEV_HGCM_PARM_TYPE_64BIT:
 562                         *dst_parm = *src_parm;
 563                         break;
 564
 565                 case VMMDEV_HGCM_PARM_TYPE_PAGELIST:
 566                         dst_parm->u.page_list.size = src_parm->u.page_list.size;
 567                         break;
 568
 569                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_IN:
 570                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL:
 571                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN:
 572                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT:
 573                         dst_parm->u.pointer.size = src_parm->u.pointer.size;
 574                         break;
 575
 576                 case VMMDEV_HGCM_PARM_TYPE_LINADDR:
 577                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_OUT:
 578                         dst_parm->u.pointer.size = src_parm->u.pointer.size;
 579
 580                         p = (void __user *)dst_parm->u.pointer.u.linear_addr;
 581                         ret = copy_to_user(p, bounce_bufs[i],
 582                                            min(src_parm->u.pointer.size,
 583                                                dst_parm->u.pointer.size));
 584                         if (ret)
 585                                 return -EFAULT;
 586                         break;
 587
 588                 default:
 589                         WARN_ON(1);
 590                         return -EINVAL;
 591                 }
 592         }
 593
 594         return 0;
 595 }
 596
 597 int vbg_hgcm_call(struct vbg_dev *gdev, u32 client_id, u32 function,
 598                   u32 timeout_ms, struct vmmdev_hgcm_function_parameter *parms,
 599                   u32 parm_count, int *vbox_status)
 600 {
 601         struct vmmdev_hgcm_call *call;
 602         void **bounce_bufs = NULL;
 603         bool leak_it;
 604         size_t size;
 605         int i, ret;
 606
 607         size = sizeof(struct vmmdev_hgcm_call) +
 608                    parm_count * sizeof(struct vmmdev_hgcm_function_parameter);
 609         /*
 610          * Validate and buffer the parameters for the call. This also increases
 611          * call_size with the amount of extra space needed for page lists.
 612          */
 613         ret = hgcm_call_preprocess(parms, parm_count, &bounce_bufs, &size);
 614         if (ret) {
 615                 /* Even on error bounce bufs may still have been allocated */
 616                 goto free_bounce_bufs;
 617         }
 618
 619         call = vbg_req_alloc(size, VMMDEVREQ_HGCM_CALL);
 620         if (!call) {
 621                 ret = -ENOMEM;
 622                 goto free_bounce_bufs;
 623         }
 624
 625         hgcm_call_init_call(call, client_id, function, parms, parm_count,
 626                             bounce_bufs);
 627
 628         ret = vbg_hgcm_do_call(gdev, call, timeout_ms, &leak_it);
 629         if (ret == 0) {
 630                 *vbox_status = call->header.result;
 631                 ret = hgcm_call_copy_back_result(call, parms, parm_count,
 632                                                  bounce_bufs);
 633         }
 634
 635         if (!leak_it)
 636                 vbg_req_free(call, size);
 637
 638 free_bounce_bufs:
 639         if (bounce_bufs) {
 640                 for (i = 0; i < parm_count; i++)
 641                         kvfree(bounce_bufs[i]);
 642                 kfree(bounce_bufs);
 643         }
 644
 645         return ret;
 646 }
 647 EXPORT_SYMBOL(vbg_hgcm_call);
 648
 649 #ifdef CONFIG_COMPAT
 650 int vbg_hgcm_call32(
 651         struct vbg_dev *gdev, u32 client_id, u32 function, u32 timeout_ms,
 652         struct vmmdev_hgcm_function_parameter32 *parm32, u32 parm_count,
 653         int *vbox_status)
 654 {
 655         struct vmmdev_hgcm_function_parameter *parm64 = NULL;
 656         u32 i, size;
 657         int ret = 0;
 658
 659         /* KISS allocate a temporary request and convert the parameters. */
 660         size = parm_count * sizeof(struct vmmdev_hgcm_function_parameter);
 661         parm64 = kzalloc(size, GFP_KERNEL);
 662         if (!parm64)
 663                 return -ENOMEM;
 664
 665         for (i = 0; i < parm_count; i++) {
 666                 switch (parm32[i].type) {
 667                 case VMMDEV_HGCM_PARM_TYPE_32BIT:
 668                         parm64[i].type = VMMDEV_HGCM_PARM_TYPE_32BIT;
 669                         parm64[i].u.value32 = parm32[i].u.value32;
 670                         break;
 671
 672                 case VMMDEV_HGCM_PARM_TYPE_64BIT:
 673                         parm64[i].type = VMMDEV_HGCM_PARM_TYPE_64BIT;
 674                         parm64[i].u.value64 = parm32[i].u.value64;
 675                         break;
 676
 677                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_OUT:
 678                 case VMMDEV_HGCM_PARM_TYPE_LINADDR:
 679                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_IN:
 680                         parm64[i].type = parm32[i].type;
 681                         parm64[i].u.pointer.size = parm32[i].u.pointer.size;
 682                         parm64[i].u.pointer.u.linear_addr =
 683                             parm32[i].u.pointer.u.linear_addr;
 684                         break;
 685
 686                 default:
 687                         ret = -EINVAL;
 688                 }
 689                 if (ret < 0)
 690                         goto out_free;
 691         }
 692
 693         ret = vbg_hgcm_call(gdev, client_id, function, timeout_ms,
 694                             parm64, parm_count, vbox_status);
 695         if (ret < 0)
 696                 goto out_free;
 697
 698         /* Copy back. */
 699         for (i = 0; i < parm_count; i++, parm32++, parm64++) {
 700                 switch (parm64[i].type) {
 701                 case VMMDEV_HGCM_PARM_TYPE_32BIT:
 702                         parm32[i].u.value32 = parm64[i].u.value32;
 703                         break;
 704
 705                 case VMMDEV_HGCM_PARM_TYPE_64BIT:
 706                         parm32[i].u.value64 = parm64[i].u.value64;
 707                         break;
 708
 709                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_OUT:
 710                 case VMMDEV_HGCM_PARM_TYPE_LINADDR:
 711                 case VMMDEV_HGCM_PARM_TYPE_LINADDR_IN:
 712                         parm32[i].u.pointer.size = parm64[i].u.pointer.size;
 713                         break;
 714
 715                 default:
 716                         WARN_ON(1);
 717                         ret = -EINVAL;
 718                 }
 719         }
 720
 721 out_free:
 722         kfree(parm64);
 723         return ret;
 724 }
 725 #endif
 726
 727 static const int vbg_status_code_to_errno_table[] = {
 728         [-VERR_ACCESS_DENIED]                            = -EPERM,
 729         [-VERR_FILE_NOT_FOUND]                           = -ENOENT,
 730         [-VERR_PROCESS_NOT_FOUND]                        = -ESRCH,
 731         [-VERR_INTERRUPTED]                              = -EINTR,
 732         [-VERR_DEV_IO_ERROR]                             = -EIO,
 733         [-VERR_TOO_MUCH_DATA]                            = -E2BIG,
 734         [-VERR_BAD_EXE_FORMAT]                           = -ENOEXEC,
 735         [-VERR_INVALID_HANDLE]                           = -EBADF,
 736         [-VERR_TRY_AGAIN]                                = -EAGAIN,
 737         [-VERR_NO_MEMORY]                                = -ENOMEM,
 738         [-VERR_INVALID_POINTER]                          = -EFAULT,
 739         [-VERR_RESOURCE_BUSY]                            = -EBUSY,
 740         [-VERR_ALREADY_EXISTS]                           = -EEXIST,
 741         [-VERR_NOT_SAME_DEVICE]                          = -EXDEV,
 742         [-VERR_NOT_A_DIRECTORY]                          = -ENOTDIR,
 743         [-VERR_PATH_NOT_FOUND]                           = -ENOTDIR,
 744         [-VERR_INVALID_NAME]                             = -ENOENT,
 745         [-VERR_IS_A_DIRECTORY]                           = -EISDIR,
 746         [-VERR_INVALID_PARAMETER]                        = -EINVAL,
 747         [-VERR_TOO_MANY_OPEN_FILES]                      = -ENFILE,
 748         [-VERR_INVALID_FUNCTION]                         = -ENOTTY,
 749         [-VERR_SHARING_VIOLATION]                        = -ETXTBSY,
 750         [-VERR_FILE_TOO_BIG]                             = -EFBIG,
 751         [-VERR_DISK_FULL]                                = -ENOSPC,
 752         [-VERR_SEEK_ON_DEVICE]                           = -ESPIPE,
 753         [-VERR_WRITE_PROTECT]                            = -EROFS,
 754         [-VERR_BROKEN_PIPE]                              = -EPIPE,
 755         [-VERR_DEADLOCK]                                 = -EDEADLK,
 756         [-VERR_FILENAME_TOO_LONG]                        = -ENAMETOOLONG,
 757         [-VERR_FILE_LOCK_FAILED]                         = -ENOLCK,
 758         [-VERR_NOT_IMPLEMENTED]                          = -ENOSYS,
 759         [-VERR_NOT_SUPPORTED]                            = -ENOSYS,
 760         [-VERR_DIR_NOT_EMPTY]                            = -ENOTEMPTY,
 761         [-VERR_TOO_MANY_SYMLINKS]                        = -ELOOP,
 762         [-VERR_NO_MORE_FILES]                            = -ENODATA,
 763         [-VERR_NO_DATA]                                  = -ENODATA,
 764         [-VERR_NET_NO_NETWORK]                           = -ENONET,
 765         [-VERR_NET_NOT_UNIQUE_NAME]                      = -ENOTUNIQ,
 766         [-VERR_NO_TRANSLATION]                           = -EILSEQ,
 767         [-VERR_NET_NOT_SOCKET]                           = -ENOTSOCK,
 768         [-VERR_NET_DEST_ADDRESS_REQUIRED]                = -EDESTADDRREQ,
 769         [-VERR_NET_MSG_SIZE]                             = -EMSGSIZE,
 770         [-VERR_NET_PROTOCOL_TYPE]                        = -EPROTOTYPE,
 771         [-VERR_NET_PROTOCOL_NOT_AVAILABLE]               = -ENOPROTOOPT,
 772         [-VERR_NET_PROTOCOL_NOT_SUPPORTED]               = -EPROTONOSUPPORT,
 773         [-VERR_NET_SOCKET_TYPE_NOT_SUPPORTED]            = -ESOCKTNOSUPPORT,
 774         [-VERR_NET_OPERATION_NOT_SUPPORTED]              = -EOPNOTSUPP,
 775         [-VERR_NET_PROTOCOL_FAMILY_NOT_SUPPORTED]        = -EPFNOSUPPORT,
 776         [-VERR_NET_ADDRESS_FAMILY_NOT_SUPPORTED]         = -EAFNOSUPPORT,
 777         [-VERR_NET_ADDRESS_IN_USE]                       = -EADDRINUSE,
 778         [-VERR_NET_ADDRESS_NOT_AVAILABLE]                = -EADDRNOTAVAIL,
 779         [-VERR_NET_DOWN]                                 = -ENETDOWN,
 780         [-VERR_NET_UNREACHABLE]                          = -ENETUNREACH,
 781         [-VERR_NET_CONNECTION_RESET]                     = -ENETRESET,
 782         [-VERR_NET_CONNECTION_ABORTED]                   = -ECONNABORTED,
 783         [-VERR_NET_CONNECTION_RESET_BY_PEER]             = -ECONNRESET,
 784         [-VERR_NET_NO_BUFFER_SPACE]                      = -ENOBUFS,
 785         [-VERR_NET_ALREADY_CONNECTED]                    = -EISCONN,
 786         [-VERR_NET_NOT_CONNECTED]                        = -ENOTCONN,
 787         [-VERR_NET_SHUTDOWN]                             = -ESHUTDOWN,
 788         [-VERR_NET_TOO_MANY_REFERENCES]                  = -ETOOMANYREFS,
 789         [-VERR_TIMEOUT]                                  = -ETIMEDOUT,
 790         [-VERR_NET_CONNECTION_REFUSED]                   = -ECONNREFUSED,
 791         [-VERR_NET_HOST_DOWN]                            = -EHOSTDOWN,
 792         [-VERR_NET_HOST_UNREACHABLE]                     = -EHOSTUNREACH,
 793         [-VERR_NET_ALREADY_IN_PROGRESS]                  = -EALREADY,
 794         [-VERR_NET_IN_PROGRESS]                          = -EINPROGRESS,
 795         [-VERR_MEDIA_NOT_PRESENT]                        = -ENOMEDIUM,
 796         [-VERR_MEDIA_NOT_RECOGNIZED]                     = -EMEDIUMTYPE,
 797 };
 798
 799 int vbg_status_code_to_errno(int rc)
 800 {
 801         if (rc >= 0)
 802                 return 0;
 803
 804         rc = -rc;
 805         if (rc >= ARRAY_SIZE(vbg_status_code_to_errno_table) ||
 806             vbg_status_code_to_errno_table[rc] == 0) {
 807                 vbg_warn("%s: Unhandled err %d\n", __func__, -rc);
 808                 return -EPROTO;
 809         }
 810
 811         return vbg_status_code_to_errno_table[rc];
 812 }
 813 EXPORT_SYMBOL(vbg_status_code_to_errno);