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
  26 #ifndef DEBUG_INTERRUPTS
  27 #undef PrintDebug
  28 #define PrintDebug(fmt, args...)
  29 #endif
  30
  31
  32
  33
  34 struct intr_controller {
  35   struct intr_ctrl_ops * ctrl_ops;
  36
  37   void * priv_data;
  38   struct list_head ctrl_node;
  39 };
  40
  41
  42 void v3_init_interrupt_state(struct guest_info * info) {
  43   info->intr_state.excp_pending = 0;
  44   info->intr_state.excp_num = 0;
  45   info->intr_state.excp_error_code = 0;
  46
  47   memset((uchar_t *)(info->intr_state.hooks), 0, sizeof(struct v3_irq_hook *) * 256);
  48 }
  49
  50 void v3_register_intr_controller(struct guest_info * info, struct intr_ctrl_ops * ops, void * state) {
  51   struct intr_controller * ctrlr = (struct intr_controller *)V3_Malloc(sizeof(struct intr_controller));
  52
  53   ctrlr->priv_data = state;
  54   ctrlr->ctrl_ops = ops;
  55
  56   list_add(&(ctrlr->ctrl_node), &(info->intr_state.controller_list));
  57
  58 }
  59
  60
  61
  62
  63 static inline struct v3_irq_hook * get_irq_hook(struct guest_info * info, uint_t irq) {
  64   V3_ASSERT(irq <= 256);
  65   return info->intr_state.hooks[irq];
  66 }
  67
  68
  69 int v3_hook_irq(struct guest_info * info,
  70                 uint_t irq,
  71                 int (*handler)(struct guest_info * info, struct v3_interrupt * intr, void * priv_data),
  72                 void  * priv_data)
  73 {
  74   struct v3_irq_hook * hook = (struct v3_irq_hook *)V3_Malloc(sizeof(struct v3_irq_hook));
  75
  76   if (hook == NULL) {
  77     return -1;
  78   }
  79
  80   if (get_irq_hook(info, irq) != NULL) {
  81     PrintError("IRQ %d already hooked\n", irq);
  82     return -1;
  83   }
  84
  85   hook->handler = handler;
  86   hook->priv_data = priv_data;
  87
  88   info->intr_state.hooks[irq] = hook;
  89
  90   if (V3_Hook_Interrupt(info, irq)) {
  91     PrintError("hook_irq: failed to hook irq %d\n", irq);
  92     return -1;
  93   } else {
  94     PrintDebug("hook_irq: hooked irq %d\n", irq);
  95     return 0;
  96   }
  97 }
  98
  99
 100
 101 static int passthrough_irq_handler(struct guest_info * info, struct v3_interrupt * intr, void * priv_data)
 102 {
 103
 104   PrintDebug("[passthrough_irq_handler] raise_irq=%d (guest=0x%p)\n",
 105              intr->irq, (void *)info);
 106   return v3_raise_irq(info, intr->irq);
 107
 108 }
 109
 110 int v3_hook_passthrough_irq(struct guest_info * info, uint_t irq)
 111 {
 112
 113   int rc = v3_hook_irq(info, irq, passthrough_irq_handler, NULL);
 114
 115   if (rc) {
 116     PrintError("guest_irq_injection: failed to hook irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 117     return -1;
 118   } else {
 119     PrintDebug("guest_irq_injection: hooked irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 120     return 0;
 121   }
 122 }
 123
 124
 125
 126
 127
 128 int v3_deliver_irq(struct guest_info * info, struct v3_interrupt * intr) {
 129   PrintDebug("v3_deliver_irq: irq=%d state=0x%p, \n", intr->irq, (void *)intr);
 130
 131   struct v3_irq_hook * hook = get_irq_hook(info, intr->irq);
 132
 133   if (hook == NULL) {
 134     PrintError("Attempting to deliver interrupt to non registered hook(irq=%d)\n", intr->irq);
 135     return -1;
 136   }
 137
 138   return hook->handler(info, intr, hook->priv_data);
 139 }
 140
 141
 142
 143
 144
 145
 146
 147
 148 int v3_raise_exception_with_error(struct guest_info * info, uint_t excp, uint_t error_code) {
 149   struct v3_intr_state * intr_state = &(info->intr_state);
 150
 151   if (intr_state->excp_pending == 0) {
 152     intr_state->excp_pending = 1;
 153     intr_state->excp_num = excp;
 154     intr_state->excp_error_code = error_code;
 155     intr_state->excp_error_code_valid = 1;
 156     PrintDebug("[v3_raise_exception_with_error] error code: %x\n", error_code);
 157   } else {
 158     PrintError("exception already pending, currently not implemented\n");
 159     return -1;
 160   }
 161
 162   return 0;
 163 }
 164
 165 int v3_raise_exception(struct guest_info * info, uint_t excp) {
 166   struct v3_intr_state * intr_state = &(info->intr_state);
 167   PrintDebug("[v3_raise_exception]\n");
 168   if (intr_state->excp_pending == 0) {
 169     intr_state->excp_pending = 1;
 170     intr_state->excp_num = excp;
 171     intr_state->excp_error_code = 0;
 172     intr_state->excp_error_code_valid = 0;
 173   } else {
 174     PrintError("exception already pending, currently not implemented\n");
 175     return -1;
 176   }
 177
 178   return 0;
 179 }
 180
 181
 182 int v3_lower_irq(struct guest_info * info, int irq) {
 183   struct intr_controller * ctrl = NULL;
 184   struct v3_intr_state * intr_state = &(info->intr_state);
 185
 186   PrintDebug("[v3_lower_irq]\n");
 187
 188   list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 189     ctrl->ctrl_ops->lower_intr(ctrl->priv_data, irq);
 190   }
 191
 192   return 0;
 193 }
 194
 195 int v3_raise_irq(struct guest_info * info, int irq) {
 196   struct intr_controller * ctrl = NULL;
 197   struct v3_intr_state * intr_state = &(info->intr_state);
 198
 199   PrintDebug("[v3_raise_irq]\n");
 200
 201   list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 202     ctrl->ctrl_ops->raise_intr(ctrl->priv_data, irq);
 203   }
 204
 205   return 0;
 206 }
 207
 208
 209
 210 int v3_intr_pending(struct guest_info * info) {
 211   struct v3_intr_state * intr_state = &(info->intr_state);
 212
 213   //  PrintDebug("[intr_pending]\n");
 214   if (intr_state->excp_pending == 1) {
 215     return 1;
 216   } else {
 217     struct intr_controller * ctrl = NULL;
 218
 219     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 220       if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 221         return 1;
 222       }
 223     }
 224   }
 225
 226   return 0;
 227 }
 228
 229
 230 uint_t v3_get_intr_number(struct guest_info * info) {
 231   struct v3_intr_state * intr_state = &(info->intr_state);
 232
 233   if (intr_state->excp_pending == 1) {
 234     return intr_state->excp_num;
 235   } else {
 236     struct intr_controller * ctrl = NULL;
 237
 238     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 239       if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data)) {
 240         uint_t intr_num = ctrl->ctrl_ops->get_intr_number(ctrl->priv_data);
 241
 242         PrintDebug("[get_intr_number] intr_number = %d\n", intr_num);
 243
 244         return intr_num;
 245       }
 246     }
 247   }
 248
 249   return 0;
 250 }
 251
 252
 253 intr_type_t v3_get_intr_type(struct guest_info * info) {
 254   struct v3_intr_state * intr_state = &(info->intr_state);
 255
 256   if (intr_state->excp_pending) {
 257     PrintDebug("[get_intr_type] Exception\n");
 258     return EXCEPTION;
 259   } else {
 260     struct intr_controller * ctrl = NULL;
 261
 262     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 263       if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 264         PrintDebug("[get_intr_type] External_irq\n");
 265         return EXTERNAL_IRQ;
 266       }
 267     }
 268   }
 269
 270   PrintDebug("[get_intr_type] Invalid_Intr\n");
 271   return INVALID_INTR;
 272 }
 273
 274
 275
 276
 277
 278
 279 int v3_injecting_intr(struct guest_info * info, uint_t intr_num, intr_type_t type) {
 280   struct v3_intr_state * intr_state = &(info->intr_state);
 281
 282   if (type == EXCEPTION) {
 283     PrintDebug("[injecting_intr] Exception\n");
 284     intr_state->excp_pending = 0;
 285     intr_state->excp_num = 0;
 286     intr_state->excp_error_code = 0;
 287     intr_state->excp_error_code_valid = 0;
 288
 289   } else if (type == EXTERNAL_IRQ) {
 290     struct intr_controller * ctrl = NULL;
 291
 292     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 293       PrintDebug("[injecting_intr] External_Irq with intr_num = %x\n", intr_num);
 294       ctrl->ctrl_ops->begin_irq(ctrl->priv_data, intr_num);
 295     }
 296   }
 297
 298   return 0;
 299 }