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 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 void v3_init_intr_routers(struct v3_vm_info * vm) {
  66
  67     INIT_LIST_HEAD(&(vm->intr_routers.router_list));
  68
  69     v3_lock_init(&(vm->intr_routers.irq_lock));
  70
  71     memset((uchar_t *)(vm->intr_routers.hooks), 0, sizeof(struct v3_irq_hook *) * 256);
  72 }
  73
  74
  75 int v3_register_intr_controller(struct guest_info * info, struct intr_ctrl_ops * ops, void * priv_data) {
  76     struct intr_controller * ctrlr = (struct intr_controller *)V3_Malloc(sizeof(struct intr_controller));
  77
  78     ctrlr->priv_data = priv_data;
  79     ctrlr->ctrl_ops = ops;
  80
  81     list_add(&(ctrlr->ctrl_node), &(info->intr_core_state.controller_list));
  82
  83     return 0;
  84 }
  85
  86 int v3_register_intr_router(struct v3_vm_info * vm, struct intr_router_ops * ops, void * priv_data) {
  87     struct intr_router * router = (struct intr_router *)V3_Malloc(sizeof(struct intr_router));
  88
  89     router->priv_data = priv_data;
  90     router->router_ops = ops;
  91
  92     list_add(&(router->router_node), &(vm->intr_routers.router_list));
  93
  94     return 0;
  95 }
  96
  97
  98
  99 static inline struct v3_irq_hook * get_irq_hook(struct v3_vm_info * vm, uint_t irq) {
 100     V3_ASSERT(irq <= 256);
 101     return vm->intr_routers.hooks[irq];
 102 }
 103
 104
 105 int v3_hook_irq(struct v3_vm_info * vm,
 106                 uint_t irq,
 107                 int (*handler)(struct v3_vm_info * vm, struct v3_interrupt * intr, void * priv_data),
 108                 void  * priv_data)
 109 {
 110     struct v3_irq_hook * hook = (struct v3_irq_hook *)V3_Malloc(sizeof(struct v3_irq_hook));
 111
 112     if (hook == NULL) {
 113         return -1;
 114     }
 115
 116     if (get_irq_hook(vm, irq) != NULL) {
 117         PrintError("IRQ %d already hooked\n", irq);
 118         return -1;
 119     }
 120
 121     hook->handler = handler;
 122     hook->priv_data = priv_data;
 123
 124     vm->intr_routers.hooks[irq] = hook;
 125
 126     if (V3_Hook_Interrupt(vm, irq)) {
 127         PrintError("hook_irq: failed to hook irq %d\n", irq);
 128         return -1;
 129     } else {
 130         PrintDebug("hook_irq: hooked irq %d\n", irq);
 131         return 0;
 132     }
 133 }
 134
 135
 136
 137 static int passthrough_irq_handler(struct v3_vm_info * vm, struct v3_interrupt * intr, void * priv_data) {
 138     PrintDebug("[passthrough_irq_handler] raise_irq=%d (guest=0x%p)\n",
 139                intr->irq, (void *)vm);
 140
 141     return v3_raise_irq(vm, intr->irq);
 142 }
 143
 144 int v3_hook_passthrough_irq(struct v3_vm_info * vm, uint_t irq) {
 145     int rc = v3_hook_irq(vm, irq, passthrough_irq_handler, NULL);
 146
 147     if (rc) {
 148         PrintError("guest_irq_injection: failed to hook irq 0x%x (guest=0x%p)\n", irq, (void *)vm);
 149         return -1;
 150     } else {
 151         PrintDebug("guest_irq_injection: hooked irq 0x%x (guest=0x%p)\n", irq, (void *)vm);
 152         return 0;
 153     }
 154 }
 155
 156
 157
 158
 159
 160 int v3_deliver_irq(struct v3_vm_info * vm, struct v3_interrupt * intr) {
 161     PrintDebug("v3_deliver_irq: irq=%d state=0x%p, \n", intr->irq, (void *)intr);
 162
 163     struct v3_irq_hook * hook = get_irq_hook(vm, intr->irq);
 164
 165     if (hook == NULL) {
 166         PrintError("Attempting to deliver interrupt to non registered hook(irq=%d)\n", intr->irq);
 167         return -1;
 168     }
 169
 170     return hook->handler(vm, intr, hook->priv_data);
 171 }
 172
 173
 174
 175
 176
 177 int v3_raise_virq(struct guest_info * info, int irq) {
 178     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 179     int major = irq / 8;
 180     int minor = irq % 8;
 181
 182     intr_state->virq_map[major] |= (1 << minor);
 183
 184     return 0;
 185 }
 186
 187 int v3_lower_virq(struct guest_info * info, int irq) {
 188     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 189     int major = irq / 8;
 190     int minor = irq % 8;
 191
 192     intr_state->virq_map[major] &= ~(1 << minor);
 193
 194     return 0;
 195 }
 196
 197
 198 int v3_lower_irq(struct v3_vm_info * vm, int irq) {
 199     struct intr_router * router = NULL;
 200     struct v3_intr_routers * routers = &(vm->intr_routers);
 201
 202     //    PrintDebug("[v3_lower_irq]\n");
 203     addr_t irq_state = v3_lock_irqsave(routers->irq_lock);
 204
 205     list_for_each_entry(router, &(routers->router_list), router_node) {
 206         router->router_ops->lower_intr(vm, router->priv_data, irq);
 207     }
 208
 209     v3_unlock_irqrestore(routers->irq_lock, irq_state);
 210
 211     return 0;
 212 }
 213
 214 int v3_raise_irq(struct v3_vm_info * vm, int irq) {
 215     struct intr_router * router = NULL;
 216     struct v3_intr_routers * routers = &(vm->intr_routers);
 217
 218     //  PrintDebug("[v3_raise_irq (%d)]\n", irq);
 219     addr_t irq_state = v3_lock_irqsave(routers->irq_lock);
 220
 221     list_for_each_entry(router, &(routers->router_list), router_node) {
 222         router->router_ops->raise_intr(vm, router->priv_data, irq);
 223     }
 224
 225     v3_unlock_irqrestore(routers->irq_lock, irq_state);
 226
 227     return 0;
 228 }
 229
 230
 231
 232 v3_intr_type_t v3_intr_pending(struct guest_info * info) {
 233     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 234     struct intr_controller * ctrl = NULL;
 235     int ret = V3_INVALID_INTR;
 236     int i = 0;
 237
 238     //  PrintDebug("[intr_pending]\n");
 239     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 240
 241     // VIRQs have priority
 242     for (i = 0; i < MAX_IRQ / 8; i++) {
 243         if (intr_state->virq_map[i] != 0) {
 244             ret = V3_VIRTUAL_IRQ;
 245             break;
 246         }
 247     }
 248
 249     if (ret == V3_INVALID_INTR) {
 250         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 251             if (ctrl->ctrl_ops->intr_pending(info, ctrl->priv_data) == 1) {
 252                 ret = V3_EXTERNAL_IRQ;
 253                 break;
 254             }
 255         }
 256     }
 257
 258     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 259
 260     return ret;
 261 }
 262
 263
 264 uint32_t v3_get_intr(struct guest_info * info) {
 265     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 266     struct intr_controller * ctrl = NULL;
 267     uint_t ret = 0;
 268     int i = 0;
 269     int j = 0;
 270
 271     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 272
 273     // virqs have priority
 274     for (i = 0; i < MAX_IRQ / 8; i++) {
 275         if (intr_state->virq_map[i] != 0) {
 276             for (j = 0; j < 8; j++) {
 277                 if (intr_state->virq_map[i] & (1 << j)) {
 278                     ret = (i * 8) + j;
 279                     break;
 280                 }
 281             }
 282             break;
 283         }
 284     }
 285
 286     if (!ret) {
 287         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 288             if (ctrl->ctrl_ops->intr_pending(info, ctrl->priv_data)) {
 289                 uint_t intr_num = ctrl->ctrl_ops->get_intr_number(info, ctrl->priv_data);
 290
 291                 //      PrintDebug("[get_intr_number] intr_number = %d\n", intr_num);
 292                 ret = intr_num;
 293                 break;
 294             }
 295         }
 296     }
 297
 298     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 299
 300     return ret;
 301 }
 302
 303 /*
 304 intr_type_t v3_get_intr_type(struct guest_info * info) {
 305     struct v3_intr_state * intr_state = &(info->intr_state);
 306     struct intr_controller * ctrl = NULL;
 307     intr_type_t type = V3_INVALID_INTR;
 308
 309     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 310
 311     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 312         if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 313             //PrintDebug("[get_intr_type] External_irq\n");
 314             type = V3_EXTERNAL_IRQ;
 315             break;
 316         }
 317     }
 318
 319 #ifdef CONFIG_DEBUG_INTERRUPTS
 320     if (type == V3_INVALID_INTR) {
 321         PrintError("[get_intr_type] Invalid_Intr\n");
 322     }
 323 #endif
 324
 325     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 326
 327     return type;
 328 }
 329 */
 330
 331
 332
 333
 334
 335 int v3_injecting_intr(struct guest_info * info, uint_t intr_num, v3_intr_type_t type) {
 336     struct v3_intr_core_state * intr_state = &(info->intr_core_state);
 337
 338     if (type == V3_EXTERNAL_IRQ) {
 339         struct intr_controller * ctrl = NULL;
 340
 341         addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 342
 343         //      PrintDebug("[injecting_intr] External_Irq with intr_num = %x\n", intr_num);
 344         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 345             ctrl->ctrl_ops->begin_irq(info, ctrl->priv_data, intr_num);
 346         }
 347
 348         v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 349     }
 350
 351     return 0;
 352 }