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 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 void v3_init_interrupt_state(struct guest_info * info) {
  46
  47     info->intr_state.irq_pending = 0;
  48     info->intr_state.irq_started = 0;
  49     info->intr_state.irq_vector = 0;
  50
  51     INIT_LIST_HEAD(&(info->intr_state.controller_list));
  52
  53     v3_lock_init(&(info->intr_state.irq_lock));
  54
  55     memset((uchar_t *)(info->intr_state.hooks), 0, sizeof(struct v3_irq_hook *) * 256);
  56 }
  57
  58 void v3_register_intr_controller(struct guest_info * info, struct intr_ctrl_ops * ops, void * state) {
  59     struct intr_controller * ctrlr = (struct intr_controller *)V3_Malloc(sizeof(struct intr_controller));
  60
  61     ctrlr->priv_data = state;
  62     ctrlr->ctrl_ops = ops;
  63
  64     list_add(&(ctrlr->ctrl_node), &(info->intr_state.controller_list));
  65
  66 }
  67
  68
  69
  70
  71 static inline struct v3_irq_hook * get_irq_hook(struct guest_info * info, uint_t irq) {
  72     V3_ASSERT(irq <= 256);
  73     return info->intr_state.hooks[irq];
  74 }
  75
  76
  77 int v3_hook_irq(struct guest_info * info,
  78                 uint_t irq,
  79                 int (*handler)(struct guest_info * info, struct v3_interrupt * intr, void * priv_data),
  80                 void  * priv_data)
  81 {
  82     struct v3_irq_hook * hook = (struct v3_irq_hook *)V3_Malloc(sizeof(struct v3_irq_hook));
  83
  84     if (hook == NULL) {
  85         return -1;
  86     }
  87
  88     if (get_irq_hook(info, irq) != NULL) {
  89         PrintError("IRQ %d already hooked\n", irq);
  90         return -1;
  91     }
  92
  93     hook->handler = handler;
  94     hook->priv_data = priv_data;
  95
  96     info->intr_state.hooks[irq] = hook;
  97
  98     if (V3_Hook_Interrupt(info, irq)) {
  99         PrintError("hook_irq: failed to hook irq %d\n", irq);
 100         return -1;
 101     } else {
 102         PrintDebug("hook_irq: hooked irq %d\n", irq);
 103         return 0;
 104     }
 105 }
 106
 107
 108
 109 static int passthrough_irq_handler(struct guest_info * info, struct v3_interrupt * intr, void * priv_data) {
 110     PrintDebug("[passthrough_irq_handler] raise_irq=%d (guest=0x%p)\n",
 111                intr->irq, (void *)info);
 112
 113     return v3_raise_irq(info, intr->irq);
 114 }
 115
 116 int v3_hook_passthrough_irq(struct guest_info * info, uint_t irq) {
 117     int rc = v3_hook_irq(info, irq, passthrough_irq_handler, NULL);
 118
 119     if (rc) {
 120         PrintError("guest_irq_injection: failed to hook irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 121         return -1;
 122     } else {
 123         PrintDebug("guest_irq_injection: hooked irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 124         return 0;
 125     }
 126 }
 127
 128
 129
 130
 131
 132 int v3_deliver_irq(struct guest_info * info, struct v3_interrupt * intr) {
 133     PrintDebug("v3_deliver_irq: irq=%d state=0x%p, \n", intr->irq, (void *)intr);
 134
 135     struct v3_irq_hook * hook = get_irq_hook(info, intr->irq);
 136
 137     if (hook == NULL) {
 138         PrintError("Attempting to deliver interrupt to non registered hook(irq=%d)\n", intr->irq);
 139         return -1;
 140     }
 141
 142     return hook->handler(info, intr, hook->priv_data);
 143 }
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153 int v3_lower_irq(struct guest_info * info, int irq) {
 154     struct intr_controller * ctrl = NULL;
 155     struct v3_intr_state * intr_state = &(info->intr_state);
 156
 157     //    PrintDebug("[v3_lower_irq]\n");
 158     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 159
 160     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 161         ctrl->ctrl_ops->lower_intr(ctrl->priv_data, irq);
 162     }
 163
 164     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 165
 166     return 0;
 167 }
 168
 169 int v3_raise_irq(struct guest_info * info, int irq) {
 170     struct intr_controller * ctrl = NULL;
 171     struct v3_intr_state * intr_state = &(info->intr_state);
 172
 173     //  PrintDebug("[v3_raise_irq (%d)]\n", irq);
 174     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 175
 176     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 177         ctrl->ctrl_ops->raise_intr(ctrl->priv_data, irq);
 178     }
 179
 180     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 181
 182     return 0;
 183 }
 184
 185
 186
 187 int v3_intr_pending(struct guest_info * info) {
 188     struct v3_intr_state * intr_state = &(info->intr_state);
 189     struct intr_controller * ctrl = NULL;
 190     int ret = 0;
 191
 192     //  PrintDebug("[intr_pending]\n");
 193     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 194
 195     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 196         if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 197             ret = 1;
 198             break;
 199         }
 200     }
 201
 202     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 203
 204     return ret;
 205 }
 206
 207
 208 uint_t v3_get_intr_number(struct guest_info * info) {
 209     struct v3_intr_state * intr_state = &(info->intr_state);
 210     struct intr_controller * ctrl = NULL;
 211     uint_t ret = 0;
 212
 213     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 214
 215     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 216         if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data)) {
 217             uint_t intr_num = ctrl->ctrl_ops->get_intr_number(ctrl->priv_data);
 218
 219             //  PrintDebug("[get_intr_number] intr_number = %d\n", intr_num);
 220             ret = intr_num;
 221             break;
 222         }
 223     }
 224
 225     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 226
 227
 228     return ret;
 229 }
 230
 231
 232 intr_type_t v3_get_intr_type(struct guest_info * info) {
 233     struct v3_intr_state * intr_state = &(info->intr_state);
 234     struct intr_controller * ctrl = NULL;
 235     intr_type_t type = INVALID_INTR;
 236
 237     addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 238
 239     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 240         if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 241             //PrintDebug("[get_intr_type] External_irq\n");
 242             type = EXTERNAL_IRQ;
 243             break;
 244         }
 245     }
 246
 247 #ifdef DEBUG_INTERRUPTS
 248     if (type == INVALID_INTR) {
 249         PrintError("[get_intr_type] Invalid_Intr\n");
 250     }
 251 #endif
 252
 253     v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 254
 255     return type;
 256 }
 257
 258
 259
 260
 261
 262
 263 int v3_injecting_intr(struct guest_info * info, uint_t intr_num, intr_type_t type) {
 264     struct v3_intr_state * intr_state = &(info->intr_state);
 265
 266     if (type == EXTERNAL_IRQ) {
 267         struct intr_controller * ctrl = NULL;
 268
 269         addr_t irq_state = v3_lock_irqsave(intr_state->irq_lock);
 270
 271         //      PrintDebug("[injecting_intr] External_Irq with intr_num = %x\n", intr_num);
 272         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 273             ctrl->ctrl_ops->begin_irq(ctrl->priv_data, intr_num);
 274         }
 275
 276         v3_unlock_irqrestore(intr_state->irq_lock, irq_state);
 277     }
 278
 279     return 0;
 280 }