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
  44     info->intr_state.irq_pending = 0;
  45     info->intr_state.irq_vector = 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     PrintDebug("[passthrough_irq_handler] raise_irq=%d (guest=0x%p)\n",
 105                intr->irq, (void *)info);
 106
 107     return v3_raise_irq(info, intr->irq);
 108 }
 109
 110 int v3_hook_passthrough_irq(struct guest_info * info, uint_t irq) {
 111     int rc = v3_hook_irq(info, irq, passthrough_irq_handler, NULL);
 112
 113     if (rc) {
 114         PrintError("guest_irq_injection: failed to hook irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 115         return -1;
 116     } else {
 117         PrintDebug("guest_irq_injection: hooked irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 118         return 0;
 119     }
 120 }
 121
 122
 123
 124
 125
 126 int v3_deliver_irq(struct guest_info * info, struct v3_interrupt * intr) {
 127     PrintDebug("v3_deliver_irq: irq=%d state=0x%p, \n", intr->irq, (void *)intr);
 128
 129     struct v3_irq_hook * hook = get_irq_hook(info, intr->irq);
 130
 131     if (hook == NULL) {
 132         PrintError("Attempting to deliver interrupt to non registered hook(irq=%d)\n", intr->irq);
 133         return -1;
 134     }
 135
 136     return hook->handler(info, intr, hook->priv_data);
 137 }
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147 int v3_lower_irq(struct guest_info * info, int irq) {
 148     struct intr_controller * ctrl = NULL;
 149     struct v3_intr_state * intr_state = &(info->intr_state);
 150
 151     //    PrintDebug("[v3_lower_irq]\n");
 152
 153     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 154         ctrl->ctrl_ops->lower_intr(ctrl->priv_data, irq);
 155     }
 156
 157     return 0;
 158 }
 159
 160 int v3_raise_irq(struct guest_info * info, int irq) {
 161     struct intr_controller * ctrl = NULL;
 162     struct v3_intr_state * intr_state = &(info->intr_state);
 163
 164     //  PrintDebug("[v3_raise_irq (%d)]\n", irq);
 165
 166     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 167         ctrl->ctrl_ops->raise_intr(ctrl->priv_data, irq);
 168     }
 169
 170     return 0;
 171 }
 172
 173
 174
 175 int v3_intr_pending(struct guest_info * info) {
 176     struct v3_intr_state * intr_state = &(info->intr_state);
 177     struct intr_controller * ctrl = NULL;
 178     //  PrintDebug("[intr_pending]\n");
 179
 180     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 181         if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 182             return 1;
 183         }
 184     }
 185
 186
 187     return 0;
 188 }
 189
 190
 191 uint_t v3_get_intr_number(struct guest_info * info) {
 192     struct v3_intr_state * intr_state = &(info->intr_state);
 193     struct intr_controller * ctrl = NULL;
 194
 195     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 196         if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data)) {
 197             uint_t intr_num = ctrl->ctrl_ops->get_intr_number(ctrl->priv_data);
 198
 199             //  PrintDebug("[get_intr_number] intr_number = %d\n", intr_num);
 200
 201             return intr_num;
 202         }
 203     }
 204     return 0;
 205 }
 206
 207
 208 intr_type_t v3_get_intr_type(struct guest_info * info) {
 209     struct v3_intr_state * intr_state = &(info->intr_state);
 210     struct intr_controller * ctrl = NULL;
 211
 212     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 213         if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 214             //PrintDebug("[get_intr_type] External_irq\n");
 215             return EXTERNAL_IRQ;
 216         }
 217     }
 218
 219     PrintError("[get_intr_type] Invalid_Intr\n");
 220     return INVALID_INTR;
 221 }
 222
 223
 224
 225
 226
 227
 228 int v3_injecting_intr(struct guest_info * info, uint_t intr_num, intr_type_t type) {
 229     struct v3_intr_state * intr_state = &(info->intr_state);
 230
 231     if (type == EXTERNAL_IRQ) {
 232         struct intr_controller * ctrl = NULL;
 233
 234         //      PrintDebug("[injecting_intr] External_Irq with intr_num = %x\n", intr_num);
 235         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 236             ctrl->ctrl_ops->begin_irq(ctrl->priv_data, intr_num);
 237         }
 238     }
 239
 240     return 0;
 241 }