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     if (intr->should_ack == 1) {
 106         V3_ACK_IRQ(intr->irq);
 107     }
 108
 109     PrintDebug("[passthrough_irq_handler] raise_irq=%d (guest=0x%p)\n",
 110                intr->irq, (void *)info);
 111
 112     return v3_raise_irq(info, intr->irq);
 113 }
 114
 115 int v3_hook_passthrough_irq(struct guest_info * info, uint_t irq) {
 116     int rc = v3_hook_irq(info, irq, passthrough_irq_handler, NULL);
 117
 118     if (rc) {
 119         PrintError("guest_irq_injection: failed to hook irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 120         return -1;
 121     } else {
 122         PrintDebug("guest_irq_injection: hooked irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 123         return 0;
 124     }
 125 }
 126
 127
 128
 129
 130
 131 int v3_deliver_irq(struct guest_info * info, struct v3_interrupt * intr) {
 132     PrintDebug("v3_deliver_irq: irq=%d state=0x%p, \n", intr->irq, (void *)intr);
 133
 134     struct v3_irq_hook * hook = get_irq_hook(info, intr->irq);
 135
 136     if (hook == NULL) {
 137         PrintError("Attempting to deliver interrupt to non registered hook(irq=%d)\n", intr->irq);
 138         return -1;
 139     }
 140
 141     return hook->handler(info, intr, hook->priv_data);
 142 }
 143
 144
 145
 146
 147
 148
 149
 150
 151 int v3_raise_exception_with_error(struct guest_info * info, uint_t excp, uint_t error_code) {
 152     struct v3_intr_state * intr_state = &(info->intr_state);
 153
 154     if (intr_state->excp_pending == 0) {
 155         intr_state->excp_pending = 1;
 156         intr_state->excp_num = excp;
 157         intr_state->excp_error_code = error_code;
 158         intr_state->excp_error_code_valid = 1;
 159         PrintDebug("[v3_raise_exception_with_error] error code: %x\n", error_code);
 160     } else {
 161         PrintError("exception already pending, currently not implemented\n");
 162         return -1;
 163     }
 164
 165     return 0;
 166 }
 167
 168 int v3_raise_exception(struct guest_info * info, uint_t excp) {
 169     struct v3_intr_state * intr_state = &(info->intr_state);
 170     PrintDebug("[v3_raise_exception]\n");
 171     if (intr_state->excp_pending == 0) {
 172         intr_state->excp_pending = 1;
 173         intr_state->excp_num = excp;
 174         intr_state->excp_error_code = 0;
 175         intr_state->excp_error_code_valid = 0;
 176     } else {
 177         PrintError("exception already pending, currently not implemented\n");
 178         return -1;
 179     }
 180
 181     return 0;
 182 }
 183
 184
 185 int v3_lower_irq(struct guest_info * info, int irq) {
 186     struct intr_controller * ctrl = NULL;
 187     struct v3_intr_state * intr_state = &(info->intr_state);
 188
 189     PrintDebug("[v3_lower_irq]\n");
 190
 191     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 192         ctrl->ctrl_ops->lower_intr(ctrl->priv_data, irq);
 193     }
 194
 195     return 0;
 196 }
 197
 198 int v3_raise_irq(struct guest_info * info, int irq) {
 199     struct intr_controller * ctrl = NULL;
 200     struct v3_intr_state * intr_state = &(info->intr_state);
 201
 202     PrintDebug("[v3_raise_irq (%d)]\n", irq);
 203
 204     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 205         ctrl->ctrl_ops->raise_intr(ctrl->priv_data, irq);
 206     }
 207
 208     return 0;
 209 }
 210
 211
 212
 213 int v3_intr_pending(struct guest_info * info) {
 214     struct v3_intr_state * intr_state = &(info->intr_state);
 215
 216     //  PrintDebug("[intr_pending]\n");
 217     if (intr_state->excp_pending == 1) {
 218         return 1;
 219     } else {
 220         struct intr_controller * ctrl = NULL;
 221
 222         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 223             if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 224                 return 1;
 225             }
 226         }
 227     }
 228
 229     return 0;
 230 }
 231
 232
 233 uint_t v3_get_intr_number(struct guest_info * info) {
 234     struct v3_intr_state * intr_state = &(info->intr_state);
 235
 236     if (intr_state->excp_pending == 1) {
 237         return intr_state->excp_num;
 238     } else {
 239         struct intr_controller * ctrl = NULL;
 240
 241         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 242             if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data)) {
 243                 uint_t intr_num = ctrl->ctrl_ops->get_intr_number(ctrl->priv_data);
 244
 245                 PrintDebug("[get_intr_number] intr_number = %d\n", intr_num);
 246
 247                 return intr_num;
 248             }
 249         }
 250     }
 251
 252     return 0;
 253 }
 254
 255
 256 intr_type_t v3_get_intr_type(struct guest_info * info) {
 257     struct v3_intr_state * intr_state = &(info->intr_state);
 258
 259     if (intr_state->excp_pending) {
 260         PrintDebug("[get_intr_type] Exception\n");
 261         return EXCEPTION;
 262     } else {
 263         struct intr_controller * ctrl = NULL;
 264
 265         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 266             if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 267                 PrintDebug("[get_intr_type] External_irq\n");
 268                 return EXTERNAL_IRQ;
 269             }
 270         }
 271     }
 272
 273     PrintDebug("[get_intr_type] Invalid_Intr\n");
 274     return INVALID_INTR;
 275 }
 276
 277
 278
 279
 280
 281
 282 int v3_injecting_intr(struct guest_info * info, uint_t intr_num, intr_type_t type) {
 283     struct v3_intr_state * intr_state = &(info->intr_state);
 284
 285     if (type == EXCEPTION) {
 286         PrintDebug("[injecting_intr] Exception\n");
 287         intr_state->excp_pending = 0;
 288         intr_state->excp_num = 0;
 289         intr_state->excp_error_code = 0;
 290         intr_state->excp_error_code_valid = 0;
 291
 292     } else if (type == EXTERNAL_IRQ) {
 293         struct intr_controller * ctrl = NULL;
 294
 295         PrintDebug("[injecting_intr] External_Irq with intr_num = %x\n", intr_num);
 296         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 297             ctrl->ctrl_ops->begin_irq(ctrl->priv_data, intr_num);
 298         }
 299     }
 300
 301     return 0;
 302 }