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