palacios/src/palacios/svm_handler.c

   1 #include <palacios/svm_handler.h>
   2 #include <palacios/vmm.h>
   3 #include <palacios/vm_guest_mem.h>
   4 #include <palacios/vmm_decoder.h>
   5 #include <palacios/vmm_ctrl_regs.h>
   6 #include <palacios/svm_io.h>
   7 #include <palacios/svm_halt.h>
   8 #include <palacios/svm_pause.h>
   9 #include <palacios/vmm_intr.h>
  10
  11
  12 int handle_svm_exit(struct guest_info * info) {
  13   vmcb_ctrl_t * guest_ctrl = 0;
  14   vmcb_saved_state_t * guest_state = 0;
  15   ulong_t exit_code = 0;
  16
  17   guest_ctrl = GET_VMCB_CTRL_AREA((vmcb_t*)(info->vmm_data));
  18   guest_state = GET_VMCB_SAVE_STATE_AREA((vmcb_t*)(info->vmm_data));
  19
  20
  21   // Update the high level state
  22   info->rip = guest_state->rip;
  23   info->vm_regs.rsp = guest_state->rsp;
  24   info->vm_regs.rax = guest_state->rax;
  25
  26   info->cpl = guest_state->cpl;
  27
  28
  29   info->ctrl_regs.cr0 = guest_state->cr0;
  30   info->ctrl_regs.cr2 = guest_state->cr2;
  31   info->ctrl_regs.cr3 = guest_state->cr3;
  32   info->ctrl_regs.cr4 = guest_state->cr4;
  33   info->ctrl_regs.cr8 = guest_ctrl->guest_ctrl.V_TPR;
  34   info->ctrl_regs.rflags = guest_state->rflags;
  35
  36   get_vmcb_segments((vmcb_t*)(info->vmm_data), &(info->segments));
  37
  38
  39   exit_code = guest_ctrl->exit_code;
  40
  41
  42   // Disable printing io exits due to bochs debug messages
  43   //if (!((exit_code == VMEXIT_IOIO) && ((ushort_t)(guest_ctrl->exit_info1 >> 16) == 0x402))) {
  44
  45
  46   PrintDebug("SVM Returned: Exit Code: 0x%x \t\t(tsc=%ul)\n",exit_code, (uint_t)info->time_state.guest_tsc);
  47
  48   if (exit_code < 0x4f) {
  49     char instr[32];
  50     int ret;
  51     // Dump out the instr stream
  52
  53     //PrintDebug("RIP: %x\n", guest_state->rip);
  54     PrintDebug("RIP Linear: %x\n", get_addr_linear(info, info->rip, &(info->segments.cs)));
  55
  56     // OK, now we will read the instruction
  57     // The only difference between PROTECTED and PROTECTED_PG is whether we read
  58     // from guest_pa or guest_va
  59     if (info->mem_mode == PHYSICAL_MEM) {
  60       // The real rip address is actually a combination of the rip + CS base
  61       ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 32, instr);
  62     } else {
  63       ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 32, instr);
  64     }
  65
  66     if (ret != 32) {
  67       // I think we should inject a GPF into the guest
  68       PrintDebug("Could not read instruction (ret=%d)\n", ret);
  69     } else {
  70
  71       PrintDebug("Instr Stream:\n");
  72       PrintTraceMemDump(instr, 32);
  73     }
  74   }
  75
  76
  77     //  }
  78   // PrintDebugVMCB((vmcb_t*)(info->vmm_data));
  79
  80
  81   // PrintDebug("SVM Returned:(VMCB=%x)\n", info->vmm_data);
  82   //PrintDebug("RIP: %x\n", guest_state->rip);
  83
  84
  85   //PrintDebug("SVM Returned: Exit Code: %x\n",exit_code);
  86
  87   if (exit_code == VMEXIT_IOIO) {
  88     struct svm_io_info * io_info = (struct svm_io_info *)&(guest_ctrl->exit_info1);
  89
  90     if (io_info->type == 0) {
  91       if (io_info->str) {
  92         if (handle_svm_io_outs(info) == -1 ) {
  93           return -1;
  94         }
  95       } else {
  96         if (handle_svm_io_out(info) == -1) {
  97           return -1;
  98         }
  99       }
 100     } else {
 101       if (io_info->str) {
 102         if (handle_svm_io_ins(info) == -1) {
 103           return -1;
 104         }
 105       } else {
 106         if (handle_svm_io_in(info) == -1) {
 107           return -1;
 108         }
 109       }
 110     }
 111   } else if (exit_code == VMEXIT_CR0_WRITE) {
 112     PrintDebug("CR0 Write\n");
 113
 114     if (handle_cr0_write(info) == -1) {
 115       return -1;
 116     }
 117   } else if (exit_code == VMEXIT_CR0_READ) {
 118     PrintDebug("CR0 Read\n");
 119
 120     if (handle_cr0_read(info) == -1) {
 121       return -1;
 122     }
 123   } else if (exit_code == VMEXIT_CR3_WRITE) {
 124     PrintDebug("CR3 Write\n");
 125
 126     if (handle_cr3_write(info) == -1) {
 127       return -1;
 128     }
 129   } else if (exit_code == VMEXIT_CR3_READ) {
 130     PrintDebug("CR3 Read\n");
 131
 132     if (handle_cr3_read(info) == -1) {
 133       return -1;
 134     }
 135
 136   } else if (exit_code == VMEXIT_EXCP14) {
 137     addr_t fault_addr = guest_ctrl->exit_info2;
 138     pf_error_t * error_code = (pf_error_t *)&(guest_ctrl->exit_info1);
 139
 140     PrintDebug("PageFault at %x (error=%d)\n", fault_addr, *error_code);
 141
 142     if (info->shdw_pg_mode == SHADOW_PAGING) {
 143       if (handle_shadow_pagefault(info, fault_addr, *error_code) == -1) {
 144         return -1;
 145       }
 146     } else {
 147
 148       PrintDebug("Page fault in un implemented paging mode\n");
 149
 150       return -1;
 151     }
 152   } else if (exit_code == VMEXIT_NPF) {
 153     PrintDebug("Currently unhandled Nested Page Fault\n");
 154     return -1;
 155
 156   } else if (exit_code == VMEXIT_INVLPG) {
 157     if (info->shdw_pg_mode == SHADOW_PAGING) {
 158       PrintDebug("Invlpg\n");
 159       if (handle_shadow_invlpg(info) == -1) {
 160         return -1;
 161       }
 162     }
 163
 164     /*
 165       (exit_code == VMEXIT_INVLPGA)   ||
 166     */
 167
 168   } else if (exit_code == VMEXIT_INTR) {
 169
 170     //    handle_svm_intr(info);
 171
 172   } else if (exit_code == VMEXIT_SMI) {
 173
 174     //   handle_svm_smi(info); // ignored for now
 175
 176   } else if (exit_code == VMEXIT_HLT) {
 177     PrintDebug("Guest halted\n");
 178     if (handle_svm_halt(info) == -1) {
 179       return -1;
 180     }
 181   } else if (exit_code == VMEXIT_PAUSE) {
 182     PrintDebug("Guest paused\n");
 183     if (handle_svm_pause(info) == -1) {
 184       return -1;
 185     }
 186   } else {
 187     addr_t rip_addr;
 188     char buf[15];
 189     addr_t host_addr;
 190
 191
 192     rip_addr = get_addr_linear(info, guest_state->rip, &(info->segments.cs));
 193
 194
 195
 196     PrintDebug("SVM Returned:(VMCB=%x)\n", info->vmm_data);
 197     PrintDebug("RIP: %x\n", guest_state->rip);
 198     PrintDebug("RIP Linear: %x\n", rip_addr);
 199
 200     PrintDebug("SVM Returned: Exit Code: %x\n",exit_code);
 201
 202     PrintDebug("io_info1 low = 0x%.8x\n", *(uint_t*)&(guest_ctrl->exit_info1));
 203     PrintDebug("io_info1 high = 0x%.8x\n", *(uint_t *)(((uchar_t *)&(guest_ctrl->exit_info1)) + 4));
 204
 205     PrintDebug("io_info2 low = 0x%.8x\n", *(uint_t*)&(guest_ctrl->exit_info2));
 206     PrintDebug("io_info2 high = 0x%.8x\n", *(uint_t *)(((uchar_t *)&(guest_ctrl->exit_info2)) + 4));
 207
 208
 209
 210     if (info->mem_mode == PHYSICAL_MEM) {
 211       if (guest_pa_to_host_pa(info, guest_state->rip, &host_addr) == -1) {
 212         PrintDebug("Could not translate guest_state->rip to host address\n");
 213         return -1;
 214       }
 215     } else if (info->mem_mode == VIRTUAL_MEM) {
 216       if (guest_va_to_host_pa(info, guest_state->rip, &host_addr) == -1) {
 217         PrintDebug("Could not translate guest_state->rip to host address\n");
 218         return -1;
 219       }
 220     } else {
 221       PrintDebug("Invalid memory mode\n");
 222       return -1;
 223     }
 224
 225     PrintDebug("Host Address of rip = 0x%x\n", host_addr);
 226
 227     memset(buf, 0, 15);
 228
 229     PrintDebug("Reading from 0x%x in guest\n", rip_addr);
 230
 231     if (info->mem_mode == PHYSICAL_MEM) {
 232       read_guest_pa_memory(info, rip_addr, 15, buf);
 233     } else {
 234       read_guest_va_memory(info, rip_addr, 15, buf);
 235     }
 236
 237     PrintTraceMemDump(buf, 15);
 238
 239     return -1;
 240
 241   }
 242
 243
 244   // Update the low level state
 245
 246   if (intr_pending(info)) {
 247
 248     switch (get_intr_type(info)) {
 249     case EXTERNAL_IRQ:
 250       {
 251         uint_t irq = get_intr_number(info);
 252         /*
 253           guest_ctrl->EVENTINJ.vector = irq;
 254           guest_ctrl->EVENTINJ.valid = 1;
 255           guest_ctrl->EVENTINJ.type = SVM_INJECTION_EXTERNAL_INTR;
 256         */
 257
 258         guest_ctrl->guest_ctrl.V_IRQ = 1;
 259         guest_ctrl->guest_ctrl.V_INTR_VECTOR = irq;
 260         guest_ctrl->guest_ctrl.V_IGN_TPR = 1;
 261         guest_ctrl->guest_ctrl.V_INTR_PRIO = 0xf;
 262
 263         PrintDebug("Injecting Interrupt %d (EIP=%x)\n", guest_ctrl->guest_ctrl.V_INTR_VECTOR, info->rip);
 264
 265         injecting_intr(info, irq, EXTERNAL_IRQ);
 266
 267         break;
 268       }
 269     case NMI:
 270       guest_ctrl->EVENTINJ.type = SVM_INJECTION_NMI;
 271       break;
 272     case EXCEPTION:
 273       {
 274         uint_t excp = get_intr_number(info);
 275
 276         guest_ctrl->EVENTINJ.type = SVM_INJECTION_EXCEPTION;
 277
 278         if (info->intr_state.excp_error_code_valid) {  //PAD
 279           guest_ctrl->EVENTINJ.error_code = info->intr_state.excp_error_code;
 280           guest_ctrl->EVENTINJ.ev = 1;
 281           PrintDebug("Injecting error code %x\n", guest_ctrl->EVENTINJ.error_code);
 282         }
 283
 284         guest_ctrl->EVENTINJ.vector = excp;
 285
 286         guest_ctrl->EVENTINJ.valid = 1;
 287         PrintDebug("Injecting Interrupt %d (EIP=%x)\n", guest_ctrl->EVENTINJ.vector, info->rip);
 288         injecting_intr(info, excp, EXCEPTION);
 289         break;
 290       }
 291     case SOFTWARE_INTR:
 292       guest_ctrl->EVENTINJ.type = SVM_INJECTION_SOFT_INTR;
 293       break;
 294     case VIRTUAL_INTR:
 295       guest_ctrl->EVENTINJ.type = SVM_INJECTION_VIRTUAL_INTR;
 296       break;
 297
 298     case INVALID_INTR:
 299     default:
 300       PrintDebug("Attempted to issue an invalid interrupt\n");
 301       return -1;
 302     }
 303
 304   }
 305
 306
 307   guest_state->cr0 = info->ctrl_regs.cr0;
 308   guest_state->cr2 = info->ctrl_regs.cr2;
 309   guest_state->cr3 = info->ctrl_regs.cr3;
 310   guest_state->cr4 = info->ctrl_regs.cr4;
 311   guest_ctrl->guest_ctrl.V_TPR = info->ctrl_regs.cr8 & 0xff;
 312   guest_state->rflags = info->ctrl_regs.rflags;
 313
 314
 315   guest_state->cpl = info->cpl;
 316
 317   guest_state->rax = info->vm_regs.rax;
 318   guest_state->rip = info->rip;
 319   guest_state->rsp = info->vm_regs.rsp;
 320
 321
 322   set_vmcb_segments((vmcb_t*)(info->vmm_data), &(info->segments));
 323
 324   if (exit_code == VMEXIT_INTR) {
 325     //PrintDebug("INTR ret IP = %x\n", guest_state->rip);
 326   }
 327
 328   return 0;
 329 }
 330