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 intr_router * router = NULL;
 278     struct v3_intr_routers * routers = &(vm->intr_routers);
 279
 280     //    PrintDebug("[v3_lower_irq]\n");
 281     addr_t irq_state = v3_lock_irqsave(routers->irq_lock);
 282
 283     list_for_each_entry(router, &(routers->router_list), router_node) {
 284         router->router_ops->lower_intr(vm, router->priv_data, irq);
 285     }
 286
 287     v3_unlock_irqrestore(routers->irq_lock, irq_state);
 288
 289     return 0;
 290 }
 291
 292 int v3_raise_irq(struct v3_vm_info * vm, int irq) {
 293     struct intr_router * router = NULL;
 294     struct v3_intr_routers * routers = &(vm->intr_routers);
 295
 296     //  PrintDebug("[v3_raise_irq (%d)]\n", irq);
 297     addr_t irq_state = v3_lock_irqsave(routers->irq_lock);
 298
 299     list_for_each_entry(router, &(routers->router_list), router_node) {
 300         router->router_ops->raise_intr(vm, router->priv_data, irq);
 301     }
 302
 303     v3_unlock_irqrestore(routers->irq_lock, irq_state);
 304
 305     return 0;
 306 }
 307
 308
 309
 310
 311 void v3_clear_pending_intr(struct guest_info * core) {
 312     struct v3_intr_core_state * intr_state = &(core->intr_core_state);
 313
 314     intr_state->irq_pending = 0;
 315
 316 }
 317
 318
 319 v3_intr_type_t v3_intr_pending(struct guest_info * info) {
 320     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 321     struct intr_controller * ctrl = NULL;
 322     int ret = V3_INVALID_INTR;
 323     int i = 0;
 324
 325     //  PrintDebug("[intr_pending]\n");
 326     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 327
 328     // VIRQs have priority
 329     for (i = 0; i < MAX_IRQ / 8; i++) {
 330         if (intr_state->virq_map[i] != 0) {
 331             ret = V3_VIRTUAL_IRQ;
 332             break;
 333         }
 334     }
 335
 336     if (ret == V3_INVALID_INTR) {
 337         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 338             if (ctrl->ctrl_ops->intr_pending(info, ctrl->priv_data) == 1) {
 339                 ret = V3_EXTERNAL_IRQ;
 340                 break;
 341             }
 342         }
 343     }
 344
 345     /* for swintr injection */
 346     if (intr_state->swintr_posted == 1) {
 347         ret = V3_SOFTWARE_INTR;
 348     }
 349
 350     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 351
 352     return ret;
 353 }
 354
 355
 356 uint32_t v3_get_intr(struct guest_info * info) {
 357     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 358     struct intr_controller * ctrl = NULL;
 359     uint_t ret = 0;
 360     int i = 0;
 361     int j = 0;
 362
 363     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 364
 365     // virqs have priority
 366     for (i = 0; i < MAX_IRQ / 8; i++) {
 367         if (intr_state->virq_map[i] != 0) {
 368             for (j = 0; j < 8; j++) {
 369                 if (intr_state->virq_map[i] & (1 << j)) {
 370                     ret = (i * 8) + j;
 371                     break;
 372                 }
 373             }
 374             break;
 375         }
 376     }
 377
 378     if (!ret) {
 379         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 380             if (ctrl->ctrl_ops->intr_pending(info, ctrl->priv_data)) {
 381                 uint_t intr_num = ctrl->ctrl_ops->get_intr_number(info, ctrl->priv_data);
 382
 383                 //      PrintDebug("[get_intr_number] intr_number = %d\n", intr_num);
 384                 ret = intr_num;
 385                 break;
 386             }
 387         }
 388     }
 389
 390     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 391
 392     return ret;
 393 }
 394
 395 /*
 396 intr_type_t v3_get_intr_type(struct guest_info * info) {
 397     struct v3_intr_state * intr_state = &(info->intr_state);
 398     struct intr_controller * ctrl = NULL;
 399     intr_type_t type = V3_INVALID_INTR;
 400
 401     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 402
 403     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 404         if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 405             //PrintDebug("[get_intr_type] External_irq\n");
 406             type = V3_EXTERNAL_IRQ;
 407             break;
 408         }
 409     }
 410
 411 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 412     if (type == V3_INVALID_INTR) {
 413         PrintError("[get_intr_type] Invalid_Intr\n");
 414     }
 415 #endif
 416
 417     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 418
 419     return type;
 420 }
 421 */
 422
 423
 424
 425
 426
 427 int v3_injecting_intr(struct guest_info * info, uint_t intr_num, v3_intr_type_t type) {
 428     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 429
 430     if (type == V3_EXTERNAL_IRQ) {
 431         struct intr_controller * ctrl = NULL;
 432
 433         addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 434
 435         //      PrintDebug("[injecting_intr] External_Irq with intr_num = %x\n", intr_num);
 436         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 437             ctrl->ctrl_ops->begin_irq(info, ctrl->priv_data, intr_num);
 438         }
 439
 440         v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 441     }
 442
 443     return 0;
 444 }