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   INIT_LIST_HEAD(&(info->intr_state.controller_list));
  48
  49   memset((uchar_t *)(info->intr_state.hooks), 0, sizeof(struct v3_irq_hook *) * 256);
  50 }
  51
  52 void v3_register_intr_controller(struct guest_info * info, struct intr_ctrl_ops * ops, void * state) {
  53   struct intr_controller * ctrlr = (struct intr_controller *)V3_Malloc(sizeof(struct intr_controller));
  54
  55   ctrlr->priv_data = state;
  56   ctrlr->ctrl_ops = ops;
  57
  58   list_add(&(ctrlr->ctrl_node), &(info->intr_state.controller_list));
  59
  60 }
  61
  62
  63
  64
  65 static inline struct v3_irq_hook * get_irq_hook(struct guest_info * info, uint_t irq) {
  66   V3_ASSERT(irq <= 256);
  67   return info->intr_state.hooks[irq];
  68 }
  69
  70
  71 int v3_hook_irq(struct guest_info * info,
  72                 uint_t irq,
  73                 int (*handler)(struct guest_info * info, struct v3_interrupt * intr, void * priv_data),
  74                 void  * priv_data)
  75 {
  76   struct v3_irq_hook * hook = (struct v3_irq_hook *)V3_Malloc(sizeof(struct v3_irq_hook));
  77
  78   if (hook == NULL) {
  79     return -1;
  80   }
  81
  82   if (get_irq_hook(info, irq) != NULL) {
  83     PrintError("IRQ %d already hooked\n", irq);
  84     return -1;
  85   }
  86
  87   hook->handler = handler;
  88   hook->priv_data = priv_data;
  89
  90   info->intr_state.hooks[irq] = hook;
  91
  92   if (V3_Hook_Interrupt(info, irq)) {
  93     PrintError("hook_irq: failed to hook irq %d\n", irq);
  94     return -1;
  95   } else {
  96     PrintDebug("hook_irq: hooked irq %d\n", irq);
  97     return 0;
  98   }
  99 }
 100
 101
 102
 103 static int passthrough_irq_handler(struct guest_info * info, struct v3_interrupt * intr, void * priv_data)
 104 {
 105
 106   PrintDebug("[passthrough_irq_handler] raise_irq=%d (guest=0x%p)\n",
 107              intr->irq, (void *)info);
 108   return v3_raise_irq(info, intr->irq);
 109
 110 }
 111
 112 int v3_hook_passthrough_irq(struct guest_info * info, uint_t irq)
 113 {
 114
 115   int rc = v3_hook_irq(info, irq, passthrough_irq_handler, NULL);
 116
 117   if (rc) {
 118     PrintError("guest_irq_injection: failed to hook irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 119     return -1;
 120   } else {
 121     PrintDebug("guest_irq_injection: hooked irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 122     return 0;
 123   }
 124 }
 125
 126
 127
 128
 129
 130 int v3_deliver_irq(struct guest_info * info, struct v3_interrupt * intr) {
 131   PrintDebug("v3_deliver_irq: irq=%d state=0x%p, \n", intr->irq, (void *)intr);
 132
 133   struct v3_irq_hook * hook = get_irq_hook(info, intr->irq);
 134
 135   if (hook == NULL) {
 136     PrintError("Attempting to deliver interrupt to non registered hook(irq=%d)\n", intr->irq);
 137     return -1;
 138   }
 139
 140   return hook->handler(info, intr, hook->priv_data);
 141 }
 142
 143
 144
 145
 146
 147
 148
 149
 150 int v3_raise_exception_with_error(struct guest_info * info, uint_t excp, uint_t error_code) {
 151   struct v3_intr_state * intr_state = &(info->intr_state);
 152
 153   if (intr_state->excp_pending == 0) {
 154     intr_state->excp_pending = 1;
 155     intr_state->excp_num = excp;
 156     intr_state->excp_error_code = error_code;
 157     intr_state->excp_error_code_valid = 1;
 158     PrintDebug("[v3_raise_exception_with_error] error code: %x\n", error_code);
 159   } else {
 160     PrintError("exception already pending, currently not implemented\n");
 161     return -1;
 162   }
 163
 164   return 0;
 165 }
 166
 167 int v3_raise_exception(struct guest_info * info, uint_t excp) {
 168   struct v3_intr_state * intr_state = &(info->intr_state);
 169   PrintDebug("[v3_raise_exception]\n");
 170   if (intr_state->excp_pending == 0) {
 171     intr_state->excp_pending = 1;
 172     intr_state->excp_num = excp;
 173     intr_state->excp_error_code = 0;
 174     intr_state->excp_error_code_valid = 0;
 175   } else {
 176     PrintError("exception already pending, currently not implemented\n");
 177     return -1;
 178   }
 179
 180   return 0;
 181 }
 182
 183
 184 int v3_lower_irq(struct guest_info * info, int irq) {
 185   struct intr_controller * ctrl = NULL;
 186   struct v3_intr_state * intr_state = &(info->intr_state);
 187
 188   PrintDebug("[v3_lower_irq]\n");
 189
 190   list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 191     ctrl->ctrl_ops->lower_intr(ctrl->priv_data, irq);
 192   }
 193
 194   return 0;
 195 }
 196
 197 int v3_raise_irq(struct guest_info * info, int irq) {
 198   struct intr_controller * ctrl = NULL;
 199   struct v3_intr_state * intr_state = &(info->intr_state);
 200
 201   PrintDebug("[v3_raise_irq]\n");
 202
 203   list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 204     ctrl->ctrl_ops->raise_intr(ctrl->priv_data, irq);
 205   }
 206
 207   return 0;
 208 }
 209
 210
 211
 212 int v3_intr_pending(struct guest_info * info) {
 213   struct v3_intr_state * intr_state = &(info->intr_state);
 214
 215   //  PrintDebug("[intr_pending]\n");
 216   if (intr_state->excp_pending == 1) {
 217     return 1;
 218   } else {
 219     struct intr_controller * ctrl = NULL;
 220
 221     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 222       if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 223         return 1;
 224       }
 225     }
 226   }
 227
 228   return 0;
 229 }
 230
 231
 232 uint_t v3_get_intr_number(struct guest_info * info) {
 233   struct v3_intr_state * intr_state = &(info->intr_state);
 234
 235   if (intr_state->excp_pending == 1) {
 236     return intr_state->excp_num;
 237   } else {
 238     struct intr_controller * ctrl = NULL;
 239
 240     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 241       if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data)) {
 242         uint_t intr_num = ctrl->ctrl_ops->get_intr_number(ctrl->priv_data);
 243
 244         PrintDebug("[get_intr_number] intr_number = %d\n", intr_num);
 245
 246         return intr_num;
 247       }
 248     }
 249   }
 250
 251   return 0;
 252 }
 253
 254
 255 intr_type_t v3_get_intr_type(struct guest_info * info) {
 256   struct v3_intr_state * intr_state = &(info->intr_state);
 257
 258   if (intr_state->excp_pending) {
 259     PrintDebug("[get_intr_type] Exception\n");
 260     return EXCEPTION;
 261   } else {
 262     struct intr_controller * ctrl = NULL;
 263
 264     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 265       if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 266         PrintDebug("[get_intr_type] External_irq\n");
 267         return EXTERNAL_IRQ;
 268       }
 269     }
 270   }
 271
 272   PrintDebug("[get_intr_type] Invalid_Intr\n");
 273   return INVALID_INTR;
 274 }
 275
 276
 277
 278
 279
 280
 281 int v3_injecting_intr(struct guest_info * info, uint_t intr_num, intr_type_t type) {
 282   struct v3_intr_state * intr_state = &(info->intr_state);
 283
 284   if (type == EXCEPTION) {
 285     PrintDebug("[injecting_intr] Exception\n");
 286     intr_state->excp_pending = 0;
 287     intr_state->excp_num = 0;
 288     intr_state->excp_error_code = 0;
 289     intr_state->excp_error_code_valid = 0;
 290
 291   } else if (type == EXTERNAL_IRQ) {
 292     struct intr_controller * ctrl = NULL;
 293
 294     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 295       PrintDebug("[injecting_intr] External_Irq with intr_num = %x\n", intr_num);
 296       ctrl->ctrl_ops->begin_irq(ctrl->priv_data, intr_num);
 297     }
 298   }
 299
 300   return 0;
 301 }