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 #ifndef DEBUG_INTERRUPTS
  28 #undef PrintDebug
  29 #define PrintDebug(fmt, args...)
  30 #endif
  31
  32
  33
  34
  35 struct intr_controller {
  36     struct intr_ctrl_ops * ctrl_ops;
  37
  38     void * priv_data;
  39     struct list_head ctrl_node;
  40 };
  41
  42
  43 void v3_init_interrupt_state(struct guest_info * info) {
  44
  45     info->intr_state.irq_pending = 0;
  46     info->intr_state.irq_vector = 0;
  47
  48     INIT_LIST_HEAD(&(info->intr_state.controller_list));
  49
  50     memset((uchar_t *)(info->intr_state.hooks), 0, sizeof(struct v3_irq_hook *) * 256);
  51 }
  52
  53 void v3_register_intr_controller(struct guest_info * info, struct intr_ctrl_ops * ops, void * state) {
  54     struct intr_controller * ctrlr = (struct intr_controller *)V3_Malloc(sizeof(struct intr_controller));
  55
  56     ctrlr->priv_data = state;
  57     ctrlr->ctrl_ops = ops;
  58
  59     list_add(&(ctrlr->ctrl_node), &(info->intr_state.controller_list));
  60
  61 }
  62
  63
  64
  65
  66 static inline struct v3_irq_hook * get_irq_hook(struct guest_info * info, uint_t irq) {
  67     V3_ASSERT(irq <= 256);
  68     return info->intr_state.hooks[irq];
  69 }
  70
  71
  72 int v3_hook_irq(struct guest_info * info,
  73                 uint_t irq,
  74                 int (*handler)(struct guest_info * info, struct v3_interrupt * intr, void * priv_data),
  75                 void  * priv_data)
  76 {
  77     struct v3_irq_hook * hook = (struct v3_irq_hook *)V3_Malloc(sizeof(struct v3_irq_hook));
  78
  79     if (hook == NULL) {
  80         return -1;
  81     }
  82
  83     if (get_irq_hook(info, irq) != NULL) {
  84         PrintError("IRQ %d already hooked\n", irq);
  85         return -1;
  86     }
  87
  88     hook->handler = handler;
  89     hook->priv_data = priv_data;
  90
  91     info->intr_state.hooks[irq] = hook;
  92
  93     if (V3_Hook_Interrupt(info, irq)) {
  94         PrintError("hook_irq: failed to hook irq %d\n", irq);
  95         return -1;
  96     } else {
  97         PrintDebug("hook_irq: hooked irq %d\n", irq);
  98         return 0;
  99     }
 100 }
 101
 102
 103
 104 static int passthrough_irq_handler(struct guest_info * info, struct v3_interrupt * intr, void * priv_data) {
 105     PrintDebug("[passthrough_irq_handler] raise_irq=%d (guest=0x%p)\n",
 106                intr->irq, (void *)info);
 107
 108     return v3_raise_irq(info, intr->irq);
 109 }
 110
 111 int v3_hook_passthrough_irq(struct guest_info * info, uint_t irq) {
 112     int rc = v3_hook_irq(info, irq, passthrough_irq_handler, NULL);
 113
 114     if (rc) {
 115         PrintError("guest_irq_injection: failed to hook irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 116         return -1;
 117     } else {
 118         PrintDebug("guest_irq_injection: hooked irq 0x%x (guest=0x%p)\n", irq, (void *)info);
 119         return 0;
 120     }
 121 }
 122
 123
 124
 125
 126
 127 int v3_deliver_irq(struct guest_info * info, struct v3_interrupt * intr) {
 128     PrintDebug("v3_deliver_irq: irq=%d state=0x%p, \n", intr->irq, (void *)intr);
 129
 130     struct v3_irq_hook * hook = get_irq_hook(info, intr->irq);
 131
 132     if (hook == NULL) {
 133         PrintError("Attempting to deliver interrupt to non registered hook(irq=%d)\n", intr->irq);
 134         return -1;
 135     }
 136
 137     return hook->handler(info, intr, hook->priv_data);
 138 }
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148 int v3_lower_irq(struct guest_info * info, int irq) {
 149     struct intr_controller * ctrl = NULL;
 150     struct v3_intr_state * intr_state = &(info->intr_state);
 151
 152     //    PrintDebug("[v3_lower_irq]\n");
 153
 154     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 155         ctrl->ctrl_ops->lower_intr(ctrl->priv_data, irq);
 156     }
 157
 158     return 0;
 159 }
 160
 161 int v3_raise_irq(struct guest_info * info, int irq) {
 162     struct intr_controller * ctrl = NULL;
 163     struct v3_intr_state * intr_state = &(info->intr_state);
 164
 165     //  PrintDebug("[v3_raise_irq (%d)]\n", irq);
 166
 167     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 168         ctrl->ctrl_ops->raise_intr(ctrl->priv_data, irq);
 169     }
 170
 171     return 0;
 172 }
 173
 174
 175
 176 int v3_intr_pending(struct guest_info * info) {
 177     struct v3_intr_state * intr_state = &(info->intr_state);
 178     struct intr_controller * ctrl = NULL;
 179     struct rflags * flags = (struct rflags *)&(info->ctrl_regs.rflags);
 180     //  PrintDebug("[intr_pending]\n");
 181
 182     // Check if the guest has interrupts enabled
 183     if (flags->intr == 0) {
 184         return 0;
 185     }
 186
 187     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 188         if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data) == 1) {
 189             return 1;
 190         }
 191     }
 192
 193
 194     return 0;
 195 }
 196
 197
 198 uint_t v3_get_intr_number(struct guest_info * info) {
 199     struct v3_intr_state * intr_state = &(info->intr_state);
 200     struct intr_controller * ctrl = NULL;
 201
 202     list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 203         if (ctrl->ctrl_ops->intr_pending(ctrl->priv_data)) {
 204             uint_t intr_num = ctrl->ctrl_ops->get_intr_number(ctrl->priv_data);
 205
 206             //  PrintDebug("[get_intr_number] intr_number = %d\n", intr_num);
 207
 208             return intr_num;
 209         }
 210     }
 211     return 0;
 212 }
 213
 214
 215 intr_type_t v3_get_intr_type(struct guest_info * info) {
 216     struct v3_intr_state * intr_state = &(info->intr_state);
 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             //PrintDebug("[get_intr_type] External_irq\n");
 222             return EXTERNAL_IRQ;
 223         }
 224     }
 225
 226     PrintError("[get_intr_type] Invalid_Intr\n");
 227     return INVALID_INTR;
 228 }
 229
 230
 231
 232
 233
 234
 235 int v3_injecting_intr(struct guest_info * info, uint_t intr_num, intr_type_t type) {
 236     struct v3_intr_state * intr_state = &(info->intr_state);
 237
 238     if (type == EXTERNAL_IRQ) {
 239         struct intr_controller * ctrl = NULL;
 240
 241         //      PrintDebug("[injecting_intr] External_Irq with intr_num = %x\n", intr_num);
 242         list_for_each_entry(ctrl, &(intr_state->controller_list), ctrl_node) {
 243             ctrl->ctrl_ops->begin_irq(ctrl->priv_data, intr_num);
 244         }
 245     }
 246
 247     return 0;
 248 }