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         V3_Print("Registering 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         if (dev->ops->save) {
 154             strncpy(name_table + tbl_offset, dev->name, 32);
 155             tbl_offset += 32;
 156             num_saved_devs++;
 157         }
 158     }
 159
 160     v3_chkpt_save(dev_mgr_ctx, "num_devs", 4, &num_saved_devs);
 161     v3_chkpt_save(dev_mgr_ctx, "names", table_len, name_table);
 162
 163   list_for_each_entry(dev, &(mgr->dev_list), dev_link) {
 164         if (dev->ops->save) {
 165             struct v3_chkpt_ctx * dev_ctx = NULL;
 166
 167             V3_Print("Saving state for device (%s)\n", dev->name);
 168
 169             dev_ctx = v3_chkpt_open_ctx(chkpt, dev_mgr_ctx, dev->name);
 170
 171             dev->ops->save(dev_ctx, dev->private_data);
 172
 173             v3_chkpt_close_ctx(dev_ctx);
 174
 175             // Error checking??
 176         } else {
 177             PrintError("Error: %s save() not implemented\n",  dev->name);
 178         }
 179     }
 180
 181
 182     // Specify which devices were saved
 183     V3_Free(name_table);
 184
 185     v3_chkpt_close_ctx(dev_mgr_ctx);
 186
 187     return 0;
 188 }
 189
 190
 191 int v3_load_vm_devices(struct v3_vm_info * vm, struct v3_chkpt * chkpt) {
 192     struct vm_device * dev;
 193     struct v3_chkpt_ctx * dev_mgr_ctx = NULL;
 194     uint32_t num_devs = 0;
 195     char * name_table = NULL;
 196     int i = 0;
 197
 198     dev_mgr_ctx = v3_chkpt_open_ctx(chkpt, NULL, "devices");
 199
 200     v3_chkpt_load(dev_mgr_ctx, "num_devs", 4, &num_devs);
 201
 202     V3_Print("Loading State for %d devices\n", num_devs);
 203
 204     name_table = V3_Malloc(32 * num_devs);
 205
 206     v3_chkpt_load(dev_mgr_ctx, "names", 32 * num_devs, name_table);
 207
 208     for (i = 0; i < num_devs; i++) {
 209         char * name = &(name_table[i * 32]);
 210         struct v3_chkpt_ctx * dev_ctx = NULL;
 211         dev = v3_find_dev(vm, name);
 212
 213         if (!dev) {
 214             PrintError("Tried to load state into non existant device: %s\n", name);
 215             continue;
 216         }
 217
 218         if (!dev->ops->load) {
 219             PrintError("Error Device (%s) does not support load operation\n", name);
 220             continue;
 221         }
 222
 223         dev_ctx = v3_chkpt_open_ctx(chkpt, dev_mgr_ctx, name);
 224
 225         if (!dev_ctx) {
 226             PrintError("Error missing device context (%s)\n", name);
 227             continue;
 228         }
 229
 230
 231         dev->ops->load(dev_ctx, dev->private_data);
 232     }
 233
 234     return 0;
 235 }
 236
 237
 238 #endif
 239
 240 static int free_frontends(struct v3_vm_info * vm, struct vmm_dev_mgr * mgr);
 241
 242 int v3_deinit_dev_mgr(struct v3_vm_info * vm) {
 243     struct vmm_dev_mgr * mgr = &(vm->dev_mgr);
 244
 245     // clear frontend lists
 246
 247     free_frontends(vm, mgr);
 248
 249
 250
 251     v3_free_htable(mgr->dev_table, 0, 0);
 252
 253     return 0;
 254 }
 255
 256
 257
 258 int v3_create_device(struct v3_vm_info * vm, const char * dev_name, v3_cfg_tree_t * cfg) {
 259     int (*dev_init)(struct v3_vm_info * vm, void * cfg_data);
 260
 261     dev_init = (void *)v3_htable_search(master_dev_table, (addr_t)dev_name);
 262
 263     if (dev_init == NULL) {
 264         PrintError("Could not find device %s in master device table\n", dev_name);
 265         return -1;
 266     }
 267
 268
 269     if (dev_init(vm, cfg) == -1) {
 270         PrintError("Could not initialize Device %s\n", dev_name);
 271         return -1;
 272     }
 273
 274     return 0;
 275 }
 276
 277
 278
 279
 280 struct vm_device * v3_find_dev(struct v3_vm_info * vm, const char * dev_name) {
 281     struct vmm_dev_mgr * mgr = &(vm->dev_mgr);
 282
 283     if (!dev_name) {
 284         return NULL;
 285     }
 286
 287     return (struct vm_device *)v3_htable_search(mgr->dev_table, (addr_t)dev_name);
 288 }
 289
 290
 291 /****************************************************************/
 292 /* The remaining functions are called by the devices themselves */
 293 /****************************************************************/
 294
 295 typedef enum {DEV_IO_HOOK, DEV_MSR_HOOK, DEV_CPUID_HOOK, DEV_MEM_HOOK, DEV_HCALL_HOOK} dev_rsrc_type_t;
 296
 297 struct dev_rsrc {
 298     dev_rsrc_type_t type;
 299     uint64_t rsrc;
 300
 301     struct list_head node;
 302 };
 303
 304
 305
 306 static int add_resource(struct vm_device * dev, dev_rsrc_type_t type, uint64_t rsrc_id) {
 307     struct dev_rsrc * resource = NULL;
 308
 309     resource = V3_Malloc(sizeof(struct dev_rsrc));
 310
 311     if (resource == NULL) {
 312         PrintError("Error: Could not allocate device resource\n");
 313         return -1;
 314     }
 315
 316     resource->rsrc = rsrc_id;
 317     resource->type = type;
 318
 319     list_add(&(resource->node), &(dev->res_hooks));
 320     return 0;
 321 }
 322
 323 static int free_resource(struct vm_device * dev, dev_rsrc_type_t type, uint64_t rsrc_id) {
 324     struct dev_rsrc * resource = NULL;
 325     struct dev_rsrc * tmp;
 326
 327     list_for_each_entry_safe(resource, tmp, &(dev->res_hooks), node) {
 328         if ((resource->type == type) &&
 329             (resource->rsrc == rsrc_id)) {
 330
 331             list_del(&(resource->node));
 332             V3_Free(resource);
 333
 334             return 0;
 335         }
 336     }
 337
 338     return -1;
 339 }
 340
 341
 342 int v3_dev_hook_io(struct vm_device * dev, uint16_t port,
 343                    int (*read)(struct guest_info * core, uint16_t port, void * dst, uint_t length, void * priv_data),
 344                    int (*write)(struct guest_info * core, uint16_t port, void * src, uint_t length, void * priv_data)) {
 345     int ret = 0;
 346
 347     ret = v3_hook_io_port(dev->vm, port,
 348                           (int (*)(struct guest_info * core, uint16_t, void *, uint_t, void *))read,
 349                           (int (*)(struct guest_info * core, uint16_t, void *, uint_t, void *))write,
 350                           (void *)dev->private_data);
 351
 352     if (ret == -1) {
 353         return -1;
 354     }
 355
 356     if (add_resource(dev, DEV_IO_HOOK, port) == -1) {
 357         v3_unhook_io_port(dev->vm, port);
 358         PrintError("Could not allocate io hook dev state\n");
 359         return -1;
 360     }
 361
 362     return 0;
 363 }
 364
 365
 366 int v3_dev_unhook_io(struct vm_device * dev, uint16_t port) {
 367     if (free_resource(dev, DEV_IO_HOOK, port) == 0) {
 368         return v3_unhook_io_port(dev->vm, port);
 369     }
 370
 371     return -1;
 372 }
 373
 374
 375 int v3_dev_hook_msr(struct vm_device * dev, uint32_t msr,
 376                     int (*read)(struct guest_info * core, uint32_t msr, struct v3_msr * dst, void * priv_data),
 377                     int (*write)(struct guest_info * core, uint32_t msr, struct v3_msr src, void * priv_data)) {
 378     int ret = 0;
 379
 380     ret = v3_hook_msr(dev->vm, msr, read, write, dev->private_data);
 381
 382     if (ret == -1) {
 383         return -1;
 384     }
 385
 386     if (add_resource(dev, DEV_MSR_HOOK, msr) == -1) {
 387         v3_unhook_msr(dev->vm, msr);
 388         return -1;
 389     }
 390
 391     return 0;
 392 }
 393
 394 int v3_dev_unhook_msr(struct vm_device * dev, uint32_t msr) {
 395     if (free_resource(dev, DEV_MSR_HOOK, msr) == 0) {
 396         return v3_unhook_msr(dev->vm, msr);
 397     }
 398
 399     return -1;
 400 }
 401
 402
 403
 404
 405 int v3_remove_device(struct vm_device * dev) {
 406     struct vmm_dev_mgr * mgr = &(dev->vm->dev_mgr);
 407     struct dev_rsrc * resource = NULL;
 408     struct dev_rsrc * tmp;
 409
 410     list_for_each_entry_safe(resource, tmp, &(dev->res_hooks), node) {
 411         if (resource->type == DEV_IO_HOOK) {
 412             v3_unhook_io_port(dev->vm, (uint16_t)(resource->rsrc));
 413         } else if (resource->type == DEV_MSR_HOOK) {
 414             v3_unhook_msr(dev->vm, (uint32_t)(resource->rsrc));
 415         }
 416
 417         list_del(&(resource->node));
 418         V3_Free(resource);
 419     }
 420
 421     if (dev->ops->free) {
 422         dev->ops->free(dev->private_data);
 423     } else {
 424         PrintError("Error: %s free() not implemented\n",  dev->name);
 425     }
 426
 427     list_del(&(dev->dev_link));
 428     mgr->num_devs--;
 429
 430     dev->vm = NULL;
 431
 432     V3_Free(dev);
 433     return -1;
 434 }
 435
 436
 437 struct vm_device * v3_add_device(struct v3_vm_info * vm,
 438                                  char * name,
 439                                  struct v3_device_ops * ops,
 440                                  void * private_data) {
 441     struct vmm_dev_mgr * mgr = &(vm->dev_mgr);
 442     struct vm_device * dev = NULL;
 443
 444
 445     // Check if we already registered a device of the same name
 446     if (v3_htable_search(mgr->dev_table, (addr_t)name) != (addr_t)NULL) {
 447         PrintError("Device with name (%s) already registered with VM\n", name);
 448         return NULL;
 449     }
 450
 451     dev = (struct vm_device *)V3_Malloc(sizeof(struct vm_device));
 452
 453     if (dev == NULL) {
 454         return NULL;
 455     }
 456
 457     INIT_LIST_HEAD(&(dev->res_hooks));
 458
 459     strncpy(dev->name, name, 32);
 460     dev->ops = ops;
 461     dev->private_data = private_data;
 462
 463     dev->vm = vm;
 464
 465     list_add(&(dev->dev_link), &(mgr->dev_list));
 466     mgr->num_devs++;
 467
 468     v3_htable_insert(mgr->dev_table, (addr_t)(dev->name), (addr_t)dev);
 469
 470     return dev;
 471 }
 472
 473
 474 void v3_print_dev_mgr(struct v3_vm_info * vm) {
 475     struct vmm_dev_mgr * mgr = &(vm->dev_mgr);
 476     struct vm_device * dev;
 477
 478     V3_Print("%d devices registered with manager\n", mgr->num_devs);
 479
 480     list_for_each_entry(dev, &(mgr->dev_list), dev_link) {
 481         V3_Print("Device: %s\n", dev->name);
 482     }
 483
 484     return;
 485 }
 486
 487
 488
 489
 490 struct blk_frontend {
 491     int (*connect)(struct v3_vm_info * vm,
 492                     void * frontend_data,
 493                     struct v3_dev_blk_ops * ops,
 494                     v3_cfg_tree_t * cfg,
 495                     void * priv_data);
 496
 497
 498     struct list_head blk_node;
 499
 500     void * priv_data;
 501 };
 502
 503
 504
 505 int v3_dev_add_blk_frontend(struct v3_vm_info * vm,
 506                             char * name,
 507                             int (*connect)(struct v3_vm_info * vm,
 508                                             void * frontend_data,
 509                                             struct v3_dev_blk_ops * ops,
 510                                             v3_cfg_tree_t * cfg,
 511                                             void * priv_data),
 512                             void * priv_data) {
 513
 514     struct blk_frontend * frontend = NULL;
 515
 516     frontend = (struct blk_frontend *)V3_Malloc(sizeof(struct blk_frontend));
 517     memset(frontend, 0, sizeof(struct blk_frontend));
 518
 519     frontend->connect = connect;
 520     frontend->priv_data = priv_data;
 521
 522     list_add(&(frontend->blk_node), &(vm->dev_mgr.blk_list));
 523     v3_htable_insert(vm->dev_mgr.blk_table, (addr_t)(name), (addr_t)frontend);
 524
 525     return 0;
 526 }
 527
 528 int v3_dev_connect_blk(struct v3_vm_info * vm,
 529                        char * frontend_name,
 530                        struct v3_dev_blk_ops * ops,
 531                        v3_cfg_tree_t * cfg,
 532                        void * private_data) {
 533
 534     struct blk_frontend * frontend = NULL;
 535
 536     frontend = (struct blk_frontend *)v3_htable_search(vm->dev_mgr.blk_table,
 537                                                        (addr_t)frontend_name);
 538
 539     if (frontend == NULL) {
 540         PrintError("Could not find frontend blk device %s\n", frontend_name);
 541         return 0;
 542     }
 543
 544     if (frontend->connect(vm, frontend->priv_data, ops, cfg, private_data) == -1) {
 545         PrintError("Error connecting to block frontend %s\n", frontend_name);
 546         return -1;
 547     }
 548
 549     return 0;
 550 }
 551
 552
 553
 554 struct net_frontend {
 555     int (*connect)(struct v3_vm_info * vm,
 556                     void * frontend_data,
 557                     struct v3_dev_net_ops * ops,
 558                     v3_cfg_tree_t * cfg,
 559                     void * priv_data);
 560
 561
 562     struct list_head net_node;
 563
 564     void * priv_data;
 565 };
 566
 567
 568 int v3_dev_add_net_frontend(struct v3_vm_info * vm,
 569                             char * name,
 570                             int (*connect)(struct v3_vm_info * vm,
 571                                             void * frontend_data,
 572                                             struct v3_dev_net_ops * ops,
 573                                             v3_cfg_tree_t * cfg,
 574                                             void * private_data),
 575                             void * priv_data)
 576 {
 577     struct net_frontend * frontend = NULL;
 578
 579     frontend = (struct net_frontend *)V3_Malloc(sizeof(struct net_frontend));
 580     memset(frontend, 0, sizeof(struct net_frontend));
 581
 582     frontend->connect = connect;
 583     frontend->priv_data = priv_data;
 584
 585     list_add(&(frontend->net_node), &(vm->dev_mgr.net_list));
 586     v3_htable_insert(vm->dev_mgr.net_table, (addr_t)(name), (addr_t)frontend);
 587
 588     return 0;
 589 }
 590
 591
 592 int v3_dev_connect_net(struct v3_vm_info * vm,
 593                        char * frontend_name,
 594                        struct v3_dev_net_ops * ops,
 595                        v3_cfg_tree_t * cfg,
 596                        void * private_data)
 597 {
 598     struct net_frontend * frontend = NULL;
 599
 600     frontend = (struct net_frontend *)v3_htable_search(vm->dev_mgr.net_table,
 601                                                        (addr_t)frontend_name);
 602
 603     if (frontend == NULL) {
 604         PrintError("Could not find frontend net device %s\n", frontend_name);
 605         return 0;
 606     }
 607
 608     if (frontend->connect(vm, frontend->priv_data, ops, cfg, private_data) == -1) {
 609         PrintError("Error connecting to net frontend %s\n", frontend_name);
 610         return -1;
 611     }
 612
 613     return 0;
 614 }
 615
 616
 617 struct cons_frontend {
 618     int (*connect)(struct v3_vm_info * vm,
 619                    void * frontend_data,
 620                    struct v3_dev_console_ops * ops,
 621                    v3_cfg_tree_t * cfg,
 622                    void * priv_data);
 623
 624
 625     struct list_head cons_node;
 626
 627     void * priv_data;
 628 };
 629
 630 int v3_dev_add_console_frontend(struct v3_vm_info * vm,
 631                                 char * name,
 632                                 int (*connect)(struct v3_vm_info * vm,
 633                                                void * frontend_data,
 634                                                struct v3_dev_console_ops * ops,
 635                                                v3_cfg_tree_t * cfg,
 636                                                void * private_data),
 637                                 void * priv_data)
 638 {
 639     struct cons_frontend * frontend = NULL;
 640
 641     frontend = (struct cons_frontend *)V3_Malloc(sizeof(struct cons_frontend));
 642     memset(frontend, 0, sizeof(struct cons_frontend));
 643
 644     frontend->connect = connect;
 645     frontend->priv_data = priv_data;
 646
 647     list_add(&(frontend->cons_node), &(vm->dev_mgr.cons_list));
 648     v3_htable_insert(vm->dev_mgr.cons_table, (addr_t)(name), (addr_t)frontend);
 649
 650     return 0;
 651 }
 652
 653
 654 int v3_dev_connect_console(struct v3_vm_info * vm,
 655                            char * frontend_name,
 656                            struct v3_dev_console_ops * ops,
 657                            v3_cfg_tree_t * cfg,
 658                            void * private_data)
 659 {
 660     struct cons_frontend * frontend = NULL;
 661
 662     frontend = (struct cons_frontend *)v3_htable_search(vm->dev_mgr.cons_table,
 663                                                         (addr_t)frontend_name);
 664
 665     if (frontend == NULL) {
 666         PrintError("Could not find frontend console device %s\n", frontend_name);
 667         return 0;
 668     }
 669
 670     if (frontend->connect(vm, frontend->priv_data, ops, cfg, private_data) == -1) {
 671         PrintError("Error connecting to console frontend %s\n", frontend_name);
 672         return -1;
 673     }
 674
 675     return 0;
 676 }
 677
 678 struct char_frontend {
 679     int (*connect)(struct v3_vm_info * vm,
 680                    void * frontend_data,
 681                    struct v3_dev_char_ops * ops,
 682                    v3_cfg_tree_t * cfg,
 683                    void * priv_data,
 684                    void ** push_fn_arg);
 685
 686
 687     struct list_head char_node;
 688
 689     void * priv_data;
 690 };
 691
 692 int v3_dev_add_char_frontend(struct v3_vm_info * vm,
 693                              char * name,
 694                              int (*connect)(struct v3_vm_info * vm,
 695                                             void * frontend_data,
 696                                             struct v3_dev_char_ops * ops,
 697                                             v3_cfg_tree_t * cfg,
 698                                             void * private_data,
 699                                             void ** push_fn_arg),
 700                              void * priv_data)
 701 {
 702     struct char_frontend * frontend = NULL;
 703
 704     frontend = (struct char_frontend *)V3_Malloc(sizeof(struct char_frontend));
 705     memset(frontend, 0, sizeof(struct char_frontend));
 706
 707     frontend->connect = connect;
 708     frontend->priv_data = priv_data;
 709
 710     list_add(&(frontend->char_node), &(vm->dev_mgr.char_list));
 711     v3_htable_insert(vm->dev_mgr.char_table, (addr_t)(name), (addr_t)frontend);
 712
 713     return 0;
 714 }
 715
 716
 717 int v3_dev_connect_char(struct v3_vm_info * vm,
 718                         char * frontend_name,
 719                         struct v3_dev_char_ops * ops,
 720                         v3_cfg_tree_t * cfg,
 721                         void * private_data,
 722                         void ** push_fn_arg)
 723 {
 724     struct char_frontend * frontend = NULL;
 725
 726     frontend = (struct char_frontend *)v3_htable_search(vm->dev_mgr.char_table,
 727                                                         (addr_t)frontend_name);
 728
 729     if (frontend == NULL) {
 730         PrintError("Could not find frontend char device %s\n", frontend_name);
 731         return 0;
 732     }
 733
 734     if (frontend->connect(vm, frontend->priv_data, ops, cfg, private_data, push_fn_arg) == -1) {
 735         PrintError("Error connecting to char frontend %s\n", frontend_name);
 736         return -1;
 737     }
 738
 739     return 0;
 740 }
 741
 742
 743
 744 static int free_frontends(struct v3_vm_info * vm, struct vmm_dev_mgr * mgr) {
 745     struct char_frontend * chr = NULL;
 746     struct char_frontend * tmp_chr = NULL;
 747     struct cons_frontend * cons = NULL;
 748     struct cons_frontend * tmp_cons = NULL;
 749     struct net_frontend * net = NULL;
 750     struct net_frontend * tmp_net = NULL;
 751     struct blk_frontend * blk = NULL;
 752     struct blk_frontend * tmp_blk = NULL;
 753
 754
 755
 756     list_for_each_entry_safe(chr, tmp_chr, &(mgr->char_list), char_node) {
 757         list_del(&(chr->char_node));
 758         V3_Free(chr);
 759     }
 760
 761     list_for_each_entry_safe(cons, tmp_cons, &(mgr->cons_list), cons_node) {
 762         list_del(&(cons->cons_node));
 763         V3_Free(cons);
 764     }
 765
 766     list_for_each_entry_safe(net, tmp_net, &(mgr->net_list), net_node) {
 767         list_del(&(net->net_node));
 768         V3_Free(net);
 769     }
 770
 771     list_for_each_entry_safe(blk, tmp_blk, &(mgr->blk_list), blk_node) {
 772         list_del(&(blk->blk_node));
 773         V3_Free(blk);
 774     }
 775
 776     v3_free_htable(mgr->blk_table, 0, 0);
 777     v3_free_htable(mgr->net_table, 0, 0);
 778     v3_free_htable(mgr->char_table, 0, 0);
 779     v3_free_htable(mgr->cons_table, 0, 0);
 780
 781
 782     return 0;
 783 }