palacios/src/palacios/vmm_intr.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
  21 #include <palacios/vmm_intr.h>
  22 #include <palacios/vmm.h>
  23
  24 #include <palacios/vm_guest.h>
  25 #include <palacios/vmm_ctrl_regs.h>
  26
  27 #include <palacios/vmm_lock.h>
  28
  29 #ifndef V3_CONFIG_DEBUG_INTERRUPTS
  30 #undef PrintDebug
  31 #define PrintDebug(fmt, args...)
  32 #endif
  33
  34
  35
  36
  37 struct intr_controller {
  38     struct intr_ctrl_ops * ctrl_ops;
  39
  40     void * priv_data;
  41     struct list_head ctrl_node;
  42 };
  43
  44
  45 struct intr_router {
  46     struct intr_router_ops * router_ops;
  47
  48     void * priv_data;
  49     struct list_head router_node;
  50
  51 };
  52
  53 void v3_init_intr_controllers(struct guest_info * info) {
  54     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
  55
  56     intr_state->irq_pending = 0;
  57     intr_state->irq_started = 0;
  58     intr_state->irq_vector = 0;
  59
  60     v3_lock_init(&(intr_state->irq_lock));
  61
  62     INIT_LIST_HEAD(&(intr_state->controller_list));
  63 }
  64
  65
  66 void v3_deinit_intr_controllers(struct guest_info * core) {
  67     struct v3_intr_core_state * intr_state = &(core->intr_core_state);
  68     struct intr_controller * ctrlr;
  69     struct intr_controller * tmp;
  70
  71     // clear out any controllers that were left around
  72     list_for_each_entry_safe(ctrlr, tmp, &(intr_state->controller_list), ctrl_node) {
  73         v3_remove_intr_controller(core, ctrlr);
  74     }
  75 }
  76
  77
  78 void v3_init_intr_routers(struct v3_vm_info * vm) {
  79
  80     INIT_LIST_HEAD(&(vm->intr_routers.router_list));
  81
  82     v3_lock_init(&(vm->intr_routers.irq_lock));
  83
  84     memset((uchar_t *)(vm->intr_routers.hooks), 0, sizeof(struct v3_irq_hook *) * 256);
  85 }
  86
  87
  88 void v3_deinit_intr_routers(struct v3_vm_info * vm) {
  89     struct intr_router * rtr = NULL;
  90     struct intr_router * tmp = NULL;
  91
  92     // clear out any controllers that were left around
  93     list_for_each_entry_safe(rtr, tmp, &(vm->intr_routers.router_list), router_node) {
  94         v3_remove_intr_router(vm, rtr);
  95     }
  96 }
  97
  98 void * v3_register_intr_controller(struct guest_info * info, struct intr_ctrl_ops * ops, void * priv_data) {
  99     struct intr_controller * ctrlr = (struct intr_controller *)V3_Malloc(sizeof(struct intr_controller));
 100
 101     ctrlr->priv_data = priv_data;
 102     ctrlr->ctrl_ops = ops;
 103
 104     list_add(&(ctrlr->ctrl_node), &(info->intr_core_state.controller_list));
 105
 106     return (void *)ctrlr;
 107 }
 108
 109 void v3_remove_intr_controller(struct guest_info * core, void * handle) {
 110     struct v3_intr_core_state * intr_state = &(core->intr_core_state);
 111     struct intr_controller * ctrlr = handle;
 112     struct intr_controller * tmp = NULL;
 113     int found = 0;
 114
 115     // search for the entry in the router list
 116     list_for_each_entry(tmp, &(intr_state->controller_list), ctrl_node) {
 117         if (tmp == ctrlr) {
 118             found = 1;
 119         }
 120     }
 121
 122     if (found == 0) {
 123         PrintError("Attempted to remove invalid interrupt controller handle\n");
 124         return;
 125     }
 126
 127     list_del(&(ctrlr->ctrl_node));
 128     V3_Free(ctrlr);
 129 }
 130
 131 void * v3_register_intr_router(struct v3_vm_info * vm, struct intr_router_ops * ops, void * priv_data) {
 132     struct intr_router * router = (struct intr_router *)V3_Malloc(sizeof(struct intr_router));
 133
 134     router->priv_data = priv_data;
 135     router->router_ops = ops;
 136
 137     list_add(&(router->router_node), &(vm->intr_routers.router_list));
 138
 139     return (void *)router;
 140 }
 141
 142 void v3_remove_intr_router(struct v3_vm_info * vm, void * handle) {
 143     struct intr_router * router = handle;
 144     struct intr_router * tmp = NULL;
 145     int found = 0;
 146
 147     // search for the entry in the router list
 148     list_for_each_entry(tmp, &(vm->intr_routers.router_list), router_node) {
 149         if (tmp == router) {
 150             found = 1;
 151         }
 152     }
 153
 154     if (found == 0) {
 155         PrintError("Attempted to remove invalid interrupt router\n");
 156         return;
 157     }
 158
 159     list_del(&(router->router_node));
 160     V3_Free(router);
 161 }
 162
 163
 164
 165 static inline struct v3_irq_hook * get_irq_hook(struct v3_vm_info * vm, uint_t irq) {
 166     V3_ASSERT(irq <= 256);
 167     return vm->intr_routers.hooks[irq];
 168 }
 169
 170
 171 int v3_hook_irq(struct v3_vm_info * vm,
 172                 uint_t irq,
 173                 int (*handler)(struct v3_vm_info * vm, struct v3_interrupt * intr, void * priv_data),
 174                 void  * priv_data)
 175 {
 176     struct v3_irq_hook * hook = (struct v3_irq_hook *)V3_Malloc(sizeof(struct v3_irq_hook));
 177
 178     if (hook == NULL) {
 179         return -1;
 180     }
 181
 182     if (get_irq_hook(vm, irq) != NULL) {
 183         PrintError("IRQ %d already hooked\n", irq);
 184         return -1;
 185     }
 186
 187     hook->handler = handler;
 188     hook->priv_data = priv_data;
 189
 190     vm->intr_routers.hooks[irq] = hook;
 191
 192     if (V3_Hook_Interrupt(vm, irq)) {
 193         PrintError("hook_irq: failed to hook irq %d\n", irq);
 194         return -1;
 195     } else {
 196         PrintDebug("hook_irq: hooked irq %d\n", irq);
 197         return 0;
 198     }
 199 }
 200
 201
 202
 203 static int passthrough_irq_handler(struct v3_vm_info * vm, struct v3_interrupt * intr, void * priv_data) {
 204     PrintDebug("[passthrough_irq_handler] raise_irq=%d (guest=0x%p)\n",
 205                intr->irq, (void *)vm);
 206
 207     return v3_raise_irq(vm, intr->irq);
 208 }
 209
 210 int v3_hook_passthrough_irq(struct v3_vm_info * vm, uint_t irq) {
 211     int rc = v3_hook_irq(vm, irq, passthrough_irq_handler, NULL);
 212
 213     if (rc) {
 214         PrintError("guest_irq_injection: failed to hook irq 0x%x (guest=0x%p)\n", irq, (void *)vm);
 215         return -1;
 216     } else {
 217         PrintDebug("guest_irq_injection: hooked irq 0x%x (guest=0x%p)\n", irq, (void *)vm);
 218         return 0;
 219     }
 220 }
 221
 222
 223
 224
 225
 226 int v3_deliver_irq(struct v3_vm_info * vm, struct v3_interrupt * intr) {
 227     PrintDebug("v3_deliver_irq: irq=%d state=0x%p, \n", intr->irq, (void *)intr);
 228
 229     struct v3_irq_hook * hook = get_irq_hook(vm, intr->irq);
 230
 231     if (hook == NULL) {
 232         PrintError("Attempting to deliver interrupt to non registered hook(irq=%d)\n", intr->irq);
 233         return -1;
 234     }
 235
 236     return hook->handler(vm, intr, hook->priv_data);
 237 }
 238
 239
 240
 241
 242 int v3_raise_swintr (struct guest_info * core, uint8_t vector) {
 243     struct v3_intr_core_state * intr_state = &(core->intr_core_state);
 244
 245     PrintDebug("Signaling software interrupt in v3_signal_swintr()\n");
 246     PrintDebug("\tINT vector: %d\n", vector);
 247
 248     intr_state->swintr_posted = 1;
 249     intr_state->swintr_vector = vector;
 250     return 0;
 251 }
 252
 253
 254
 255 int v3_raise_virq(struct guest_info * info, int irq) {
 256     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 257     int major = irq / 8;
 258     int minor = irq % 8;
 259
 260     intr_state->virq_map[major] |= (1 << minor);
 261
 262     return 0;
 263 }
 264
 265 int v3_lower_virq(struct guest_info * info, int irq) {
 266     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 267     int major = irq / 8;
 268     int minor = irq % 8;
 269
 270     intr_state->virq_map[major] &= ~(1 << minor);
 271
 272     return 0;
 273 }
 274
 275
 276 int v3_lower_irq(struct v3_vm_info * vm, int irq) {
 277     struct v3_irq irq_state;
 278
 279     irq_state.irq = irq;
 280     irq_state.ack = NULL;
 281     irq_state.private_data = NULL;
 282
 283     return v3_lower_acked_irq(vm, irq_state);
 284 }
 285
 286 int v3_raise_irq(struct v3_vm_info * vm, int irq) {
 287     struct v3_irq irq_state;
 288
 289     irq_state.irq = irq;
 290     irq_state.ack = NULL;
 291     irq_state.private_data = NULL;
 292
 293     return v3_raise_acked_irq(vm, irq_state);
 294 }
 295
 296
 297 int v3_raise_acked_irq(struct v3_vm_info * vm, struct v3_irq irq) {
 298     struct intr_router * router = NULL;
 299     struct v3_intr_routers * routers = &(vm->intr_routers);
 300
 301     //  PrintDebug("[v3_raise_irq (%d)]\n", irq);
 302     addr_t irq_state = v3_lock_irqsave(routers->irq_lock);
 303
 304     list_for_each_entry(router, &(routers->router_list), router_node) {
 305         router->router_ops->raise_intr(vm, router->priv_data, &irq);
 306     }
 307
 308     v3_unlock_irqrestore(routers->irq_lock, irq_state);
 309
 310     return 0;
 311 }
 312
 313
 314 int v3_lower_acked_irq(struct v3_vm_info * vm, struct v3_irq irq) {
 315     struct intr_router * router = NULL;
 316     struct v3_intr_routers * routers = &(vm->intr_routers);
 317
 318     //    PrintDebug("[v3_lower_irq]\n");
 319     addr_t irq_state = v3_lock_irqsave(routers->irq_lock);
 320
 321     list_for_each_entry(router, &(routers->router_list), router_node) {
 322         router->router_ops->lower_intr(vm, router->priv_data, &irq);
 323     }
 324
 325     v3_unlock_irqrestore(routers->irq_lock, irq_state);
 326
 327     return 0;
 328
 329 }
 330
 331
 332
 333 void v3_clear_pending_intr(struct guest_info * core) {
 334     struct v3_intr_core_state * intr_state = &(core->intr_core_state);
 335
 336     intr_state->irq_pending = 0;
 337
 338 }
 339
 340
 341 v3_intr_type_t v3_intr_pending(struct guest_info * info) {
 342     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 343     struct intr_controller * ctrl = NULL;
 344     int ret = V3_INVALID_INTR;
 345     int i = 0;
 346
 347     //  PrintDebug("[intr_pending]\n");
 348     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 349
 350     // External IRQs have lowest priority
 351     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 352         if (ctrl->ctrl_ops->intr_pending(info, ctrl->priv_data) == 1) {
 353             ret = V3_EXTERNAL_IRQ;
 354             break;
 355         }
 356     }
 357
 358     // VIRQs have 2nd priority
 359     for (i = 0; i < MAX_IRQ / 8; i++) {
 360         if (intr_state->virq_map[i] != 0) {
 361             ret = V3_VIRTUAL_IRQ;
 362             break;
 363         }
 364     }
 365
 366     /* SWINTRs have highest */
 367     if (intr_state->swintr_posted == 1) {
 368         ret = V3_SOFTWARE_INTR;
 369     }
 370
 371     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 372
 373     return ret;
 374 }
 375
 376
 377 uint32_t v3_get_intr(struct guest_info * info) {
 378     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 379     struct intr_controller * ctrl = NULL;
 380     uint_t ret = 0;
 381     int i = 0;
 382     int j = 0;
 383
 384     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 385
 386     // virqs have priority
 387     for (i = 0; i < MAX_IRQ / 8; i++) {
 388         if (intr_state->virq_map[i] != 0) {
 389             for (j = 0; j < 8; j++) {
 390                 if (intr_state->virq_map[i] & (1 << j)) {
 391                     ret = (i * 8) + j;
 392                     break;
 393                 }
 394             }
 395             break;
 396         }
 397     }
 398
 399     if (!ret) {
 400         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 401             if (ctrl->ctrl_ops->intr_pending(info, ctrl->priv_data)) {
 402                 uint_t intr_num = ctrl->ctrl_ops->get_intr_number(info, ctrl->priv_data);
 403
 404                 //      PrintDebug("[get_intr_number] intr_number = %d\n", intr_num);
 405                 ret = intr_num;
 406                 break;
 407             }
 408         }
 409     }
 410
 411     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 412
 413     return ret;
 414 }
 415
 416 /*
 417 intr_type_t v3_get_intr_type(struct guest_info * info) {
 418     struct v3_intr_state * intr_state = &(info->intr_state);
 419     struct intr_controller * ctrl = NULL;
 420     intr_type_t type = V3_INVALID_INTR;
 421
 422     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 423
 424     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 425         if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 426             //PrintDebug("[get_intr_type] External_irq\n");
 427             type = V3_EXTERNAL_IRQ;
 428             break;
 429         }
 430     }
 431
 432 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 433     if (type == V3_INVALID_INTR) {
 434         PrintError("[get_intr_type] Invalid_Intr\n");
 435     }
 436 #endif
 437
 438     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 439
 440     return type;
 441 }
 442 */
 443
 444
 445
 446
 447
 448 int v3_injecting_intr(struct guest_info * info, uint_t intr_num, v3_intr_type_t type) {
 449     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 450
 451     if (type == V3_EXTERNAL_IRQ) {
 452         struct intr_controller * ctrl = NULL;
 453
 454         addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 455
 456         //      PrintDebug("[injecting_intr] External_Irq with intr_num = %x\n", intr_num);
 457         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 458             ctrl->ctrl_ops->begin_irq(info, ctrl->priv_data, intr_num);
 459         }
 460
 461         v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 462     }
 463
 464     return 0;
 465 }