palacios/src/palacios/vmm_dev_mgr.c

   1 /*
   2  * This file is part of the Palacios Virtual Machine Monitor developed
   3  * by the V3VEE Project with funding from the United States National
   4  * Science Foundation and the Department of Energy.
   5  *
   6  * The V3VEE Project is a joint project between Northwestern University
   7  * and the University of New Mexico.  You can find out more at
   8  * http://www.v3vee.org
   9  *
  10  * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
  11  * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
  12  * All rights reserved.
  13  *
  14  * Author: Jack Lange <jarusl@cs.northwestern.edu>
  15  *
  16  * This is free software.  You are permitted to use,
  17  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  18  */
  19
  20 #include <palacios/vmm_dev_mgr.h>
  21 #include <palacios/vm_guest.h>
  22 #include <palacios/vmm.h>
  23 #include <palacios/vmm_decoder.h>
  24
  25 #ifdef V3_CONFIG_CHECKPOINT
  26 #include <palacios/vmm_checkpoint.h>
  27 #endif
  28
  29
  30 #ifndef V3_CONFIG_DEBUG_DEV_MGR
  31 #undef PrintDebug
  32 #define PrintDebug(fmt, args...)
  33 #endif
  34
  35
  36 static struct hashtable * master_dev_table = NULL;
  37
  38 static uint_t dev_hash_fn(addr_t key) {
  39     char * name = (char *)key;
  40     return v3_hash_buffer((uchar_t *)name, strlen(name));
  41 }
  42
  43 static int dev_eq_fn(addr_t key1, addr_t key2) {
  44     char * name1 = (char *)key1;
  45     char * name2 = (char *)key2;
  46
  47     return (strcmp(name1, name2) == 0);
  48 }
  49
  50
  51 int V3_init_devices() {
  52     extern struct v3_device_info __start__v3_devices[];
  53     extern struct v3_device_info __stop__v3_devices[];
  54     struct v3_device_info * tmp_dev =  __start__v3_devices;
  55     int i = 0;
  56
  57 #ifdef V3_CONFIG_DEBUG_DEV_MGR
  58     {
  59         int num_devices = (__stop__v3_devices - __start__v3_devices) / sizeof(struct v3_device_info);
  60         PrintDebug("%d Virtual devices registered with Palacios\n", num_devices);
  61     }
  62 #endif
  63
  64     PrintDebug("Start addres=%p, Stop address=%p\n", __start__v3_devices, __stop__v3_devices);
  65
  66     master_dev_table = v3_create_htable(0, dev_hash_fn, dev_eq_fn);
  67
  68
  69
  70     while (tmp_dev != __stop__v3_devices) {
  71         PrintDebug("Device: %s\n", tmp_dev->name);
  72
  73         if (v3_htable_search(master_dev_table, (addr_t)(tmp_dev->name))) {
  74             PrintError("Multiple instance of device (%s)\n", tmp_dev->name);
  75             return -1;
  76         }
  77
  78         if (v3_htable_insert(master_dev_table,
  79                              (addr_t)(tmp_dev->name),
  80                              (addr_t)(tmp_dev->init)) == 0) {
  81             PrintError("Could not add device %s to master list\n", tmp_dev->name);
  82             return -1;
  83         }
  84
  85         tmp_dev = &(__start__v3_devices[++i]);
  86     }
  87
  88
  89     return 0;
  90 }
  91
  92
  93 int V3_deinit_devices() {
  94     v3_free_htable(master_dev_table, 0, 0);
  95     return 0;
  96 }
  97
  98
  99 int v3_init_dev_mgr(struct v3_vm_info * vm) {
 100     struct vmm_dev_mgr * mgr = &(vm->dev_mgr);
 101
 102     INIT_LIST_HEAD(&(mgr->dev_list));
 103     mgr->num_devs = 0;
 104
 105     mgr->dev_table = v3_create_htable(0, dev_hash_fn, dev_eq_fn);
 106
 107     INIT_LIST_HEAD(&(mgr->blk_list));
 108     INIT_LIST_HEAD(&(mgr->net_list));
 109     INIT_LIST_HEAD(&(mgr->char_list));
 110     INIT_LIST_HEAD(&(mgr->cons_list));
 111
 112     mgr->blk_table = v3_create_htable(0, dev_hash_fn, dev_eq_fn);
 113     mgr->net_table = v3_create_htable(0, dev_hash_fn, dev_eq_fn);
 114     mgr->char_table = v3_create_htable(0, dev_hash_fn, dev_eq_fn);
 115     mgr->cons_table = v3_create_htable(0, dev_hash_fn, dev_eq_fn);
 116
 117     return 0;
 118 }
 119
 120
 121 int v3_free_vm_devices(struct v3_vm_info * vm) {
 122     struct vmm_dev_mgr * mgr = &(vm->dev_mgr);
 123     struct vm_device * dev;
 124     struct vm_device * tmp;
 125
 126     list_for_each_entry_safe(dev, tmp, &(mgr->dev_list), dev_link) {
 127         v3_remove_device(dev);
 128     }
 129
 130     return 0;
 131 }
 132
 133 #ifdef V3_CONFIG_CHECKPOINT
 134
 135 int v3_save_vm_devices(struct v3_vm_info * vm, struct v3_chkpt * chkpt) {
 136     struct vmm_dev_mgr * mgr = &(vm->dev_mgr);
 137     struct vm_device * dev;
 138     struct v3_chkpt_ctx * dev_mgr_ctx = NULL;
 139
 140     uint32_t num_saved_devs = 0;
 141     uint32_t table_len = mgr->num_devs * 32;
 142     char * name_table = NULL;
 143     uint32_t tbl_offset = 0;
 144
 145     name_table = V3_Malloc(table_len);
 146
 147     memset(name_table, 0, table_len);
 148
 149
 150     dev_mgr_ctx = v3_chkpt_open_ctx(chkpt, NULL, "devices");
 151
 152     list_for_each_entry(dev, &(mgr->dev_list), dev_link) {
 153
 154         if (dev->ops->save) {
 155             struct v3_chkpt_ctx * dev_ctx = NULL;
 156
 157
 158             dev_ctx = v3_chkpt_open_ctx(chkpt, dev_mgr_ctx, dev->name);
 159
 160             dev->ops->save(dev_ctx, dev->private_data);
 161
 162             v3_chkpt_close_ctx(dev_ctx);
 163
 164             // Error checking??
 165
 166             strncpy(name_table + tbl_offset, dev->name, 32);
 167             tbl_offset += 32;
 168             num_saved_devs++;
 169         } else {
 170             PrintError("Error: %s save() not implemented\n",  dev->name);
 171         }
 172     }
 173
 174
 175     // Specify which devices were saved
 176     v3_chkpt_save(dev_mgr_ctx, "num_devs", 4, &num_saved_devs);
 177     v3_chkpt_save(dev_mgr_ctx, "names", table_len, name_table);
 178     V3_Free(name_table);
 179
 180     v3_chkpt_close_ctx(dev_mgr_ctx);
 181
 182     return 0;
 183 }
 184
 185
 186 int v3_load_vm_devices(struct v3_vm_info * vm, struct v3_chkpt * chkpt) {
 187     struct vm_device * dev;
 188     struct v3_chkpt_ctx * dev_mgr_ctx = NULL;
 189     uint32_t num_devs = 0;
 190     char * name_table = NULL;
 191     int i = 0;
 192
 193     dev_mgr_ctx = v3_chkpt_open_ctx(chkpt, NULL, "devices");
 194
 195     v3_chkpt_load(dev_mgr_ctx, "num_devs", 4, &num_devs);
 196
 197     V3_Print("Loading State for %d devices\n", num_devs);
 198
 199     name_table = V3_Malloc(32 * num_devs);
 200
 201     v3_chkpt_load(dev_mgr_ctx, "names", 32 * num_devs, name_table);
 202
 203     for (i = 0; i < num_devs; i++) {
 204         char * name = &(name_table[i * 32]);
 205         struct v3_chkpt_ctx * dev_ctx = NULL;
 206         dev = v3_find_dev(vm, name);
 207
 208         if (!dev) {
 209             PrintError("Tried to load state into non existant device: %s\n", name);
 210             continue;
 211         }
 212
 213         if (!dev->ops->load) {
 214             PrintError("Error Device (%s) does not support load operation\n", name);
 215             continue;
 216         }
 217
 218         dev_ctx = v3_chkpt_open_ctx(chkpt, dev_mgr_ctx, name);
 219
 220         if (!dev_ctx) {
 221             PrintError("Error missing device context (%s)\n", name);
 222             continue;
 223         }
 224
 225
 226         dev->ops->load(dev_ctx, dev->private_data);
 227     }
 228
 229     return 0;
 230 }
 231
 232
 233 #endif
 234
 235 static int free_frontends(struct v3_vm_info * vm, struct vmm_dev_mgr * mgr);
 236
 237 int v3_deinit_dev_mgr(struct v3_vm_info * vm) {
 238     struct vmm_dev_mgr * mgr = &(vm->dev_mgr);
 239
 240     // clear frontend lists
 241
 242     free_frontends(vm, mgr);
 243
 244
 245
 246     v3_free_htable(mgr->dev_table, 0, 0);
 247
 248     return 0;
 249 }
 250
 251
 252
 253 int v3_create_device(struct v3_vm_info * vm, const char * dev_name, v3_cfg_tree_t * cfg) {
 254     int (*dev_init)(struct v3_vm_info * vm, void * cfg_data);
 255
 256     dev_init = (void *)v3_htable_search(master_dev_table, (addr_t)dev_name);
 257
 258     if (dev_init == NULL) {
 259         PrintError("Could not find device %s in master device table\n", dev_name);
 260         return -1;
 261     }
 262
 263
 264     if (dev_init(vm, cfg) == -1) {
 265         PrintError("Could not initialize Device %s\n", dev_name);
 266         return -1;
 267     }
 268
 269     return 0;
 270 }
 271
 272
 273
 274
 275 struct vm_device * v3_find_dev(struct v3_vm_info * vm, const char * dev_name) {
 276     struct vmm_dev_mgr * mgr = &(vm->dev_mgr);
 277
 278     if (!dev_name) {
 279         return NULL;
 280     }
 281
 282     return (struct vm_device *)v3_htable_search(mgr->dev_table, (addr_t)dev_name);
 283 }
 284
 285
 286 /****************************************************************/
 287 /* The remaining functions are called by the devices themselves */
 288 /****************************************************************/
 289
 290 typedef enum {DEV_IO_HOOK, DEV_MSR_HOOK, DEV_CPUID_HOOK, DEV_MEM_HOOK, DEV_HCALL_HOOK} dev_rsrc_type_t;
 291
 292 struct dev_rsrc {
 293     dev_rsrc_type_t type;
 294     uint64_t rsrc;
 295
 296     struct list_head node;
 297 };
 298
 299
 300
 301 static int add_resource(struct vm_device * dev, dev_rsrc_type_t type, uint64_t rsrc_id) {
 302     struct dev_rsrc * resource = NULL;
 303
 304     resource = V3_Malloc(sizeof(struct dev_rsrc));
 305
 306     if (resource == NULL) {
 307         PrintError("Error: Could not allocate device resource\n");
 308         return -1;
 309     }
 310
 311     resource->rsrc = rsrc_id;
 312     resource->type = type;
 313
 314     list_add(&(resource->node), &(dev->res_hooks));
 315     return 0;
 316 }
 317
 318 static int free_resource(struct vm_device * dev, dev_rsrc_type_t type, uint64_t rsrc_id) {
 319     struct dev_rsrc * resource = NULL;
 320     struct dev_rsrc * tmp;
 321
 322     list_for_each_entry_safe(resource, tmp, &(dev->res_hooks), node) {
 323         if ((resource->type == type) &&
 324             (resource->rsrc == rsrc_id)) {
 325
 326             list_del(&(resource->node));
 327             V3_Free(resource);
 328
 329             return 0;
 330         }
 331     }
 332
 333     return -1;
 334 }
 335
 336
 337 int v3_dev_hook_io(struct vm_device * dev, uint16_t port,
 338                    int (*read)(struct guest_info * core, uint16_t port, void * dst, uint_t length, void * priv_data),
 339                    int (*write)(struct guest_info * core, uint16_t port, void * src, uint_t length, void * priv_data)) {
 340     int ret = 0;
 341
 342     ret = v3_hook_io_port(dev->vm, port,
 343                           (int (*)(struct guest_info * core, uint16_t, void *, uint_t, void *))read,
 344                           (int (*)(struct guest_info * core, uint16_t, void *, uint_t, void *))write,
 345                           (void *)dev->private_data);
 346
 347     if (ret == -1) {
 348         return -1;
 349     }
 350
 351     if (add_resource(dev, DEV_IO_HOOK, port) == -1) {
 352         v3_unhook_io_port(dev->vm, port);
 353         PrintError("Could not allocate io hook dev state\n");
 354         return -1;
 355     }
 356
 357     return 0;
 358 }
 359
 360
 361 int v3_dev_unhook_io(struct vm_device * dev, uint16_t port) {
 362     if (free_resource(dev, DEV_IO_HOOK, port) == 0) {
 363         return v3_unhook_io_port(dev->vm, port);
 364     }
 365
 366     return -1;
 367 }
 368
 369
 370 int v3_dev_hook_msr(struct vm_device * dev, uint32_t msr,
 371                     int (*read)(struct guest_info * core, uint32_t msr, struct v3_msr * dst, void * priv_data),
 372                     int (*write)(struct guest_info * core, uint32_t msr, struct v3_msr src, void * priv_data)) {
 373     int ret = 0;
 374
 375     ret = v3_hook_msr(dev->vm, msr, read, write, dev->private_data);
 376
 377     if (ret == -1) {
 378         return -1;
 379     }
 380
 381     if (add_resource(dev, DEV_MSR_HOOK, msr) == -1) {
 382         v3_unhook_msr(dev->vm, msr);
 383         return -1;
 384     }
 385
 386     return 0;
 387 }
 388
 389 int v3_dev_unhook_msr(struct vm_device * dev, uint32_t msr) {
 390     if (free_resource(dev, DEV_MSR_HOOK, msr) == 0) {
 391         return v3_unhook_msr(dev->vm, msr);
 392     }
 393
 394     return -1;
 395 }
 396
 397
 398
 399
 400 int v3_remove_device(struct vm_device * dev) {
 401     struct vmm_dev_mgr * mgr = &(dev->vm->dev_mgr);
 402     struct dev_rsrc * resource = NULL;
 403     struct dev_rsrc * tmp;
 404
 405     list_for_each_entry_safe(resource, tmp, &(dev->res_hooks), node) {
 406         if (resource->type == DEV_IO_HOOK) {
 407             v3_unhook_io_port(dev->vm, (uint16_t)(resource->rsrc));
 408         } else if (resource->type == DEV_MSR_HOOK) {
 409             v3_unhook_msr(dev->vm, (uint32_t)(resource->rsrc));
 410         }
 411
 412         list_del(&(resource->node));
 413         V3_Free(resource);
 414     }
 415
 416     if (dev->ops->free) {
 417         dev->ops->free(dev->private_data);
 418     } else {
 419         PrintError("Error: %s free() not implemented\n",  dev->name);
 420     }
 421
 422     list_del(&(dev->dev_link));
 423     mgr->num_devs--;
 424
 425     dev->vm = NULL;
 426
 427     V3_Free(dev);
 428     return -1;
 429 }
 430
 431
 432 struct vm_device * v3_add_device(struct v3_vm_info * vm,
 433                                  char * name,
 434                                  struct v3_device_ops * ops,
 435                                  void * private_data) {
 436     struct vmm_dev_mgr * mgr = &(vm->dev_mgr);
 437     struct vm_device * dev = NULL;
 438
 439     dev = (struct vm_device *)V3_Malloc(sizeof(struct vm_device));
 440
 441     if (dev == NULL) {
 442         return NULL;
 443     }
 444
 445     INIT_LIST_HEAD(&(dev->res_hooks));
 446
 447     strncpy(dev->name, name, 32);
 448     dev->ops = ops;
 449     dev->private_data = private_data;
 450
 451     dev->vm = vm;
 452
 453     list_add(&(dev->dev_link), &(mgr->dev_list));
 454     mgr->num_devs++;
 455
 456     v3_htable_insert(mgr->dev_table, (addr_t)(dev->name), (addr_t)dev);
 457
 458     return dev;
 459 }
 460
 461
 462 void v3_print_dev_mgr(struct v3_vm_info * vm) {
 463     struct vmm_dev_mgr * mgr = &(vm->dev_mgr);
 464     struct vm_device * dev;
 465
 466     V3_Print("%d devices registered with manager\n", mgr->num_devs);
 467
 468     list_for_each_entry(dev, &(mgr->dev_list), dev_link) {
 469         V3_Print("Device: %s\n", dev->name);
 470     }
 471
 472     return;
 473 }
 474
 475
 476
 477
 478 struct blk_frontend {
 479     int (*connect)(struct v3_vm_info * vm,
 480                     void * frontend_data,
 481                     struct v3_dev_blk_ops * ops,
 482                     v3_cfg_tree_t * cfg,
 483                     void * priv_data);
 484
 485
 486     struct list_head blk_node;
 487
 488     void * priv_data;
 489 };
 490
 491
 492
 493 int v3_dev_add_blk_frontend(struct v3_vm_info * vm,
 494                             char * name,
 495                             int (*connect)(struct v3_vm_info * vm,
 496                                             void * frontend_data,
 497                                             struct v3_dev_blk_ops * ops,
 498                                             v3_cfg_tree_t * cfg,
 499                                             void * priv_data),
 500                             void * priv_data) {
 501
 502     struct blk_frontend * frontend = NULL;
 503
 504     frontend = (struct blk_frontend *)V3_Malloc(sizeof(struct blk_frontend));
 505     memset(frontend, 0, sizeof(struct blk_frontend));
 506
 507     frontend->connect = connect;
 508     frontend->priv_data = priv_data;
 509
 510     list_add(&(frontend->blk_node), &(vm->dev_mgr.blk_list));
 511     v3_htable_insert(vm->dev_mgr.blk_table, (addr_t)(name), (addr_t)frontend);
 512
 513     return 0;
 514 }
 515
 516 int v3_dev_connect_blk(struct v3_vm_info * vm,
 517                        char * frontend_name,
 518                        struct v3_dev_blk_ops * ops,
 519                        v3_cfg_tree_t * cfg,
 520                        void * private_data) {
 521
 522     struct blk_frontend * frontend = NULL;
 523
 524     frontend = (struct blk_frontend *)v3_htable_search(vm->dev_mgr.blk_table,
 525                                                        (addr_t)frontend_name);
 526
 527     if (frontend == NULL) {
 528         PrintError("Could not find frontend blk device %s\n", frontend_name);
 529         return 0;
 530     }
 531
 532     if (frontend->connect(vm, frontend->priv_data, ops, cfg, private_data) == -1) {
 533         PrintError("Error connecting to block frontend %s\n", frontend_name);
 534         return -1;
 535     }
 536
 537     return 0;
 538 }
 539
 540
 541
 542 struct net_frontend {
 543     int (*connect)(struct v3_vm_info * vm,
 544                     void * frontend_data,
 545                     struct v3_dev_net_ops * ops,
 546                     v3_cfg_tree_t * cfg,
 547                     void * priv_data);
 548
 549
 550     struct list_head net_node;
 551
 552     void * priv_data;
 553 };
 554
 555
 556 int v3_dev_add_net_frontend(struct v3_vm_info * vm,
 557                             char * name,
 558                             int (*connect)(struct v3_vm_info * vm,
 559                                             void * frontend_data,
 560                                             struct v3_dev_net_ops * ops,
 561                                             v3_cfg_tree_t * cfg,
 562                                             void * private_data),
 563                             void * priv_data)
 564 {
 565     struct net_frontend * frontend = NULL;
 566
 567     frontend = (struct net_frontend *)V3_Malloc(sizeof(struct net_frontend));
 568     memset(frontend, 0, sizeof(struct net_frontend));
 569
 570     frontend->connect = connect;
 571     frontend->priv_data = priv_data;
 572
 573     list_add(&(frontend->net_node), &(vm->dev_mgr.net_list));
 574     v3_htable_insert(vm->dev_mgr.net_table, (addr_t)(name), (addr_t)frontend);
 575
 576     return 0;
 577 }
 578
 579
 580 int v3_dev_connect_net(struct v3_vm_info * vm,
 581                        char * frontend_name,
 582                        struct v3_dev_net_ops * ops,
 583                        v3_cfg_tree_t * cfg,
 584                        void * private_data)
 585 {
 586     struct net_frontend * frontend = NULL;
 587
 588     frontend = (struct net_frontend *)v3_htable_search(vm->dev_mgr.net_table,
 589                                                        (addr_t)frontend_name);
 590
 591     if (frontend == NULL) {
 592         PrintError("Could not find frontend net device %s\n", frontend_name);
 593         return 0;
 594     }
 595
 596     if (frontend->connect(vm, frontend->priv_data, ops, cfg, private_data) == -1) {
 597         PrintError("Error connecting to net frontend %s\n", frontend_name);
 598         return -1;
 599     }
 600
 601     return 0;
 602 }
 603
 604
 605 struct cons_frontend {
 606     int (*connect)(struct v3_vm_info * vm,
 607                    void * frontend_data,
 608                    struct v3_dev_console_ops * ops,
 609                    v3_cfg_tree_t * cfg,
 610                    void * priv_data);
 611
 612
 613     struct list_head cons_node;
 614
 615     void * priv_data;
 616 };
 617
 618 int v3_dev_add_console_frontend(struct v3_vm_info * vm,
 619                                 char * name,
 620                                 int (*connect)(struct v3_vm_info * vm,
 621                                                void * frontend_data,
 622                                                struct v3_dev_console_ops * ops,
 623                                                v3_cfg_tree_t * cfg,
 624                                                void * private_data),
 625                                 void * priv_data)
 626 {
 627     struct cons_frontend * frontend = NULL;
 628
 629     frontend = (struct cons_frontend *)V3_Malloc(sizeof(struct cons_frontend));
 630     memset(frontend, 0, sizeof(struct cons_frontend));
 631
 632     frontend->connect = connect;
 633     frontend->priv_data = priv_data;
 634
 635     list_add(&(frontend->cons_node), &(vm->dev_mgr.cons_list));
 636     v3_htable_insert(vm->dev_mgr.cons_table, (addr_t)(name), (addr_t)frontend);
 637
 638     return 0;
 639 }
 640
 641
 642 int v3_dev_connect_console(struct v3_vm_info * vm,
 643                            char * frontend_name,
 644                            struct v3_dev_console_ops * ops,
 645                            v3_cfg_tree_t * cfg,
 646                            void * private_data)
 647 {
 648     struct cons_frontend * frontend = NULL;
 649
 650     frontend = (struct cons_frontend *)v3_htable_search(vm->dev_mgr.cons_table,
 651                                                         (addr_t)frontend_name);
 652
 653     if (frontend == NULL) {
 654         PrintError("Could not find frontend console device %s\n", frontend_name);
 655         return 0;
 656     }
 657
 658     if (frontend->connect(vm, frontend->priv_data, ops, cfg, private_data) == -1) {
 659         PrintError("Error connecting to console frontend %s\n", frontend_name);
 660         return -1;
 661     }
 662
 663     return 0;
 664 }
 665
 666 struct char_frontend {
 667     int (*connect)(struct v3_vm_info * vm,
 668                    void * frontend_data,
 669                    struct v3_dev_char_ops * ops,
 670                    v3_cfg_tree_t * cfg,
 671                    void * priv_data,
 672                    void ** push_fn_arg);
 673
 674
 675     struct list_head char_node;
 676
 677     void * priv_data;
 678 };
 679
 680 int v3_dev_add_char_frontend(struct v3_vm_info * vm,
 681                              char * name,
 682                              int (*connect)(struct v3_vm_info * vm,
 683                                             void * frontend_data,
 684                                             struct v3_dev_char_ops * ops,
 685                                             v3_cfg_tree_t * cfg,
 686                                             void * private_data,
 687                                             void ** push_fn_arg),
 688                              void * priv_data)
 689 {
 690     struct char_frontend * frontend = NULL;
 691
 692     frontend = (struct char_frontend *)V3_Malloc(sizeof(struct char_frontend));
 693     memset(frontend, 0, sizeof(struct char_frontend));
 694
 695     frontend->connect = connect;
 696     frontend->priv_data = priv_data;
 697
 698     list_add(&(frontend->char_node), &(vm->dev_mgr.char_list));
 699     v3_htable_insert(vm->dev_mgr.char_table, (addr_t)(name), (addr_t)frontend);
 700
 701     return 0;
 702 }
 703
 704
 705 int v3_dev_connect_char(struct v3_vm_info * vm,
 706                         char * frontend_name,
 707                         struct v3_dev_char_ops * ops,
 708                         v3_cfg_tree_t * cfg,
 709                         void * private_data,
 710                         void ** push_fn_arg)
 711 {
 712     struct char_frontend * frontend = NULL;
 713
 714     frontend = (struct char_frontend *)v3_htable_search(vm->dev_mgr.char_table,
 715                                                         (addr_t)frontend_name);
 716
 717     if (frontend == NULL) {
 718         PrintError("Could not find frontend char device %s\n", frontend_name);
 719         return 0;
 720     }
 721
 722     if (frontend->connect(vm, frontend->priv_data, ops, cfg, private_data, push_fn_arg) == -1) {
 723         PrintError("Error connecting to char frontend %s\n", frontend_name);
 724         return -1;
 725     }
 726
 727     return 0;
 728 }
 729
 730
 731
 732 static int free_frontends(struct v3_vm_info * vm, struct vmm_dev_mgr * mgr) {
 733     struct char_frontend * chr = NULL;
 734     struct char_frontend * tmp_chr = NULL;
 735     struct cons_frontend * cons = NULL;
 736     struct cons_frontend * tmp_cons = NULL;
 737     struct net_frontend * net = NULL;
 738     struct net_frontend * tmp_net = NULL;
 739     struct blk_frontend * blk = NULL;
 740     struct blk_frontend * tmp_blk = NULL;
 741
 742
 743
 744     list_for_each_entry_safe(chr, tmp_chr, &(mgr->char_list), char_node) {
 745         list_del(&(chr->char_node));
 746         V3_Free(chr);
 747     }
 748
 749     list_for_each_entry_safe(cons, tmp_cons, &(mgr->cons_list), cons_node) {
 750         list_del(&(cons->cons_node));
 751         V3_Free(cons);
 752     }
 753
 754     list_for_each_entry_safe(net, tmp_net, &(mgr->net_list), net_node) {
 755         list_del(&(net->net_node));
 756         V3_Free(net);
 757     }
 758
 759     list_for_each_entry_safe(blk, tmp_blk, &(mgr->blk_list), blk_node) {
 760         list_del(&(blk->blk_node));
 761         V3_Free(blk);
 762     }
 763
 764     v3_free_htable(mgr->blk_table, 0, 0);
 765     v3_free_htable(mgr->net_table, 0, 0);
 766     v3_free_htable(mgr->char_table, 0, 0);
 767     v3_free_htable(mgr->cons_table, 0, 0);
 768
 769
 770     return 0;
 771 }