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