palacios/src/palacios/vmm_intr.c

   1 #include <palacios/vmm_intr.h>
   2 #include <palacios/vmm.h>
   3
   4 #include <palacios/vm_guest.h>
   5
   6 #ifndef DEBUG_INTERRUPTS
   7 #undef PrintDebug
   8 #define PrintDebug(fmt, args...)
   9 #endif
  10
  11 void init_interrupt_state(struct guest_info * info) {
  12   info->intr_state.excp_pending = 0;
  13   info->intr_state.excp_num = 0;
  14   info->intr_state.excp_error_code = 0;
  15
  16   info->vm_ops.raise_irq = &v3_raise_irq;
  17 }
  18
  19 void set_intr_controller(struct guest_info * info, struct intr_ctrl_ops * ops, void * state) {
  20   info->intr_state.controller = ops;
  21   info->intr_state.controller_state = state;
  22 }
  23
  24
  25
  26 // This structure is used to dispatch
  27 // interrupts delivered to vmm via deliver interrupt to vmm
  28 // it is what we put into the opaque field given to
  29 // the host os when we install the handler
  30 struct vmm_intr_decode {
  31   void              (*handler)(struct vmm_intr_state *state);
  32   // This opaque is user supplied by the caller
  33   // of hook_irq_new
  34   void              *opaque;
  35 };
  36
  37 int hook_irq_new(uint_t irq,
  38                  void (*handler)(struct vmm_intr_state *state),
  39                  void  *opaque)
  40 {
  41   extern struct vmm_os_hooks * os_hooks;
  42
  43   struct vmm_intr_decode *d = V3_Malloc(sizeof(struct vmm_intr_decode));
  44
  45   if (!d) { return -1; }
  46
  47   d->handler = handler;
  48   d->opaque = opaque;
  49
  50   if (os_hooks->hook_interrupt_new(irq,d)) {
  51     PrintError("hook_irq_new: failed to hook irq 0x%x to decode 0x%x\n", irq,d);
  52     return -1;
  53   } else {
  54     PrintDebug("hook_irq_new: hooked irq 0x%x to decode 0x%x\n", irq,d);
  55     return 0;
  56   }
  57 }
  58
  59
  60 void deliver_interrupt_to_vmm(struct vmm_intr_state *state)
  61 {
  62
  63   PrintDebug("deliver_interrupt_to_vmm: state=0x%x\n",state);
  64
  65   struct vmm_intr_decode *d = (struct vmm_intr_decode *)(state->opaque);
  66
  67   void *temp = state->opaque;
  68   state->opaque = d->opaque;
  69
  70   d->handler(state);
  71
  72   state->opaque=temp;
  73 }
  74
  75
  76 void guest_injection_irq_handler(struct vmm_intr_state *state)
  77 {
  78   PrintDebug("guest_irq_injection: state=0x%x\n",state);
  79
  80   struct guest_info *guest = (struct guest_info *)(state->opaque);
  81
  82   PrintDebug("guest_irq_injection: injecting irq 0x%x into guest 0x%x\n",state->irq,guest);
  83   guest->vm_ops.raise_irq(guest,state->irq);
  84 }
  85
  86
  87 int hook_irq_for_guest_injection(struct guest_info *info, int irq)
  88 {
  89
  90   int rc = hook_irq_new(irq,
  91                         guest_injection_irq_handler,
  92                         info);
  93
  94   if (rc) {
  95     PrintError("guest_irq_injection: failed to hook irq 0x%x for guest 0x%x\n", irq,info);
  96     return -1;
  97   } else {
  98     PrintDebug("guest_irq_injection: hooked irq 0x%x for guest 0x%x\n", irq,info);
  99     return 0;
 100   }
 101 }
 102
 103
 104
 105
 106 int hook_irq(struct guest_info * info, int irq) {
 107   extern struct vmm_os_hooks * os_hooks;
 108
 109   return os_hooks->hook_interrupt(info, irq);
 110 }
 111
 112 int raise_exception_with_error(struct guest_info * info, uint_t excp, uint_t error_code) {
 113   struct vm_intr * intr_state = &(info->intr_state);
 114
 115   if (intr_state->excp_pending == 0) {
 116     intr_state->excp_pending = 1;
 117     intr_state->excp_num = excp;
 118     intr_state->excp_error_code = error_code;
 119     intr_state->excp_error_code_valid = 1;
 120     PrintDebug("Raising exception with error code: %x\n", error_code);
 121   } else {
 122     PrintError("exception already pending, currently not implemented\n");
 123     return -1;
 124   }
 125
 126   return 0;
 127 }
 128
 129 int raise_exception(struct guest_info * info, uint_t excp) {
 130   struct vm_intr * intr_state = &(info->intr_state);
 131
 132   if (intr_state->excp_pending == 0) {
 133     intr_state->excp_pending = 1;
 134     intr_state->excp_num = excp;
 135     intr_state->excp_error_code = 0;
 136     intr_state->excp_error_code_valid = 0;
 137   } else {
 138     PrintError("exception already pending, currently not implemented\n");
 139     return -1;
 140   }
 141
 142   return 0;
 143 }
 144
 145
 146 int v3_raise_irq(struct guest_info * info, int irq) {
 147   // Look up PIC and resend
 148   V3_ASSERT(info);
 149   V3_ASSERT(info->intr_state.controller);
 150   V3_ASSERT(info->intr_state.controller->raise_intr);
 151
 152   //  if ((info->intr_state.controller) &&
 153   //  (info->intr_state.controller->raise_intr)) {
 154     info->intr_state.controller->raise_intr(info->intr_state.controller_state, irq);
 155     //} else {
 156     // PrintDebug("There is no registered Interrupt Controller... (NULL POINTER)\n");
 157     // return -1;
 158     //}
 159   return 0;
 160 }
 161
 162
 163
 164 int intr_pending(struct guest_info * info) {
 165   struct vm_intr * intr_state = &(info->intr_state);
 166
 167   if (intr_state->excp_pending == 1) {
 168     return 1;
 169   } else if (intr_state->controller->intr_pending(intr_state->controller_state) == 1) {
 170     return 1;
 171   }
 172
 173   /* Check [A]PIC */
 174
 175   return 0;
 176 }
 177
 178
 179 uint_t get_intr_number(struct guest_info * info) {
 180   struct vm_intr * intr_state = &(info->intr_state);
 181
 182   if (intr_state->excp_pending == 1) {
 183     return intr_state->excp_num;
 184   } else if (intr_state->controller->intr_pending(intr_state->controller_state)) {
 185     return intr_state->controller->get_intr_number(intr_state->controller_state);
 186   }
 187
 188   /* someway to get the [A]PIC intr */
 189
 190   return 0;
 191 }
 192
 193
 194 intr_type_t get_intr_type(struct guest_info * info) {
 195  struct vm_intr * intr_state = &(info->intr_state);
 196
 197   if (intr_state->excp_pending) {
 198     return EXCEPTION;
 199   } else if (intr_state->controller->intr_pending(intr_state->controller_state)) {
 200     return EXTERNAL_IRQ;
 201   }
 202
 203   return INVALID_INTR;
 204 }
 205
 206
 207
 208
 209
 210
 211 int injecting_intr(struct guest_info * info, uint_t intr_num, intr_type_t type) {
 212   struct vm_intr * intr_state = &(info->intr_state);
 213
 214   if (type == EXCEPTION) {
 215
 216     intr_state->excp_pending = 0;
 217     intr_state->excp_num = 0;
 218     intr_state->excp_error_code = 0;
 219     intr_state->excp_error_code_valid = 0;
 220
 221   } else if (type == EXTERNAL_IRQ) {
 222     return intr_state->controller->begin_irq(intr_state->controller_state, intr_num);
 223   }
 224
 225   return 0;
 226 }