palacios/src/geekos/svm.c

   1 #include <geekos/svm.h>
   2 #include <geekos/vmm.h>
   3
   4 #include <geekos/vmcb.h>
   5 #include <geekos/vmm_mem.h>
   6 #include <geekos/vmm_paging.h>
   7 #include <geekos/svm_handler.h>
   8
   9 #include <geekos/vmm_debug.h>
  10 #include <geekos/vm_guest_mem.h>
  11
  12
  13 /* TEMPORARY BECAUSE SVM IS WEIRD */
  14 #include <geekos/tss.h>
  15 /* ** */
  16
  17 extern struct vmm_os_hooks * os_hooks;
  18
  19 extern uint_t cpuid_ecx(uint_t op);
  20 extern uint_t cpuid_edx(uint_t op);
  21 extern void Get_MSR(uint_t MSR, uint_t * high_byte, uint_t * low_byte);
  22 extern void Set_MSR(uint_t MSR, uint_t high_byte, uint_t low_byte);
  23 extern uint_t launch_svm(vmcb_t * vmcb_addr);
  24 extern void safe_svm_launch(vmcb_t * vmcb_addr, struct guest_gprs * gprs);
  25
  26 extern uint_t Get_CR3();
  27
  28 extern void GetGDTR(void * gdt);
  29 extern void GetIDTR(void * idt);
  30
  31 extern void DisableInts();
  32
  33 /* Checks machine SVM capability */
  34 /* Implemented from: AMD Arch Manual 3, sect 15.4 */
  35 int is_svm_capable() {
  36   uint_t ret =  cpuid_ecx(CPUID_FEATURE_IDS);
  37   uint_t vm_cr_low = 0, vm_cr_high = 0;
  38
  39
  40   if ((ret & CPUID_FEATURE_IDS_ecx_svm_avail) == 0) {
  41     PrintDebug("SVM Not Available\n");
  42     return 0;
  43   }
  44
  45   Get_MSR(SVM_VM_CR_MSR, &vm_cr_high, &vm_cr_low);
  46
  47   if ((ret & CPUID_SVM_REV_AND_FEATURE_IDS_edx_np) == 1) {
  48     PrintDebug("Nested Paging not supported\n");
  49   }
  50
  51   if ((vm_cr_low & SVM_VM_CR_MSR_svmdis) == 0) {
  52     return 1;
  53   }
  54
  55   ret = cpuid_edx(CPUID_SVM_REV_AND_FEATURE_IDS);
  56
  57   if ((ret & CPUID_SVM_REV_AND_FEATURE_IDS_edx_svml) == 0) {
  58     PrintDebug("SVM BIOS Disabled, not unlockable\n");
  59   } else {
  60     PrintDebug("SVM is locked with a key\n");
  61   }
  62
  63   return 0;
  64 }
  65
  66
  67
  68 void Init_SVM(struct vmm_ctrl_ops * vmm_ops) {
  69   reg_ex_t msr;
  70   void * host_state;
  71
  72
  73   // Enable SVM on the CPU
  74   Get_MSR(EFER_MSR, &(msr.e_reg.high), &(msr.e_reg.low));
  75   msr.e_reg.low |= EFER_MSR_svm_enable;
  76   Set_MSR(EFER_MSR, 0, msr.e_reg.low);
  77
  78   PrintDebug("SVM Enabled\n");
  79
  80
  81   // Setup the host state save area
  82   host_state = os_hooks->allocate_pages(4);
  83
  84   msr.e_reg.high = 0;
  85   msr.e_reg.low = (uint_t)host_state;
  86
  87
  88   PrintDebug("Host State being saved at %x\n", (uint_t)host_state);
  89   Set_MSR(SVM_VM_HSAVE_PA_MSR, msr.e_reg.high, msr.e_reg.low);
  90
  91
  92
  93   // Setup the SVM specific vmm operations
  94   vmm_ops->init_guest = &init_svm_guest;
  95   vmm_ops->start_guest = &start_svm_guest;
  96
  97
  98   return;
  99 }
 100
 101
 102 int init_svm_guest(struct guest_info *info) {
 103
 104   PrintDebug("Allocating VMCB\n");
 105   info->vmm_data = (void*)Allocate_VMCB();
 106
 107
 108   //PrintDebug("Generating Guest nested page tables\n");
 109   //  info->page_tables = NULL;
 110   //info->page_tables = generate_guest_page_tables_64(&(info->mem_layout), &(info->mem_list));
 111   //info->page_tables = generate_guest_page_tables(&(info->mem_layout), &(info->mem_list));
 112   //PrintDebugPageTables(info->page_tables);
 113
 114
 115
 116   PrintDebug("Initializing VMCB (addr=%x)\n", info->vmm_data);
 117   Init_VMCB((vmcb_t*)(info->vmm_data), *info);
 118
 119   //  info->rip = 0;
 120
 121   info->vm_regs.rdi = 0;
 122   info->vm_regs.rsi = 0;
 123   info->vm_regs.rbp = 0;
 124   info->vm_regs.rsp = 0;
 125   info->vm_regs.rbx = 0;
 126   info->vm_regs.rdx = 0;
 127   info->vm_regs.rcx = 0;
 128   info->vm_regs.rax = 0;
 129
 130   return 0;
 131 }
 132
 133
 134 // can we start a kernel thread here...
 135 int start_svm_guest(struct guest_info *info) {
 136
 137
 138
 139   PrintDebug("Launching SVM VM (vmcb=%x)\n", info->vmm_data);
 140   //PrintDebugVMCB((vmcb_t*)(info->vmm_data));
 141
 142   while (1) {
 143
 144     PrintDebug("SVM Launch Args (vmcb=%x), (info=%x), (vm_regs=%x)\n", info->vmm_data,  &(info->vm_regs));
 145     PrintDebug("Launching to RIP: %x\n", info->rip);
 146     safe_svm_launch((vmcb_t*)(info->vmm_data), &(info->vm_regs));
 147     //launch_svm((vmcb_t*)(info->vmm_data));
 148     PrintDebug("SVM Returned\n");
 149
 150     if (handle_svm_exit(info) != 0) {
 151       // handle exit code....
 152       break;
 153     }
 154   }
 155   return 0;
 156 }
 157
 158
 159
 160 vmcb_t * Allocate_VMCB() {
 161   vmcb_t * vmcb_page = (vmcb_t*)os_hooks->allocate_pages(1);
 162
 163
 164   memset(vmcb_page, 0, 4096);
 165
 166   return vmcb_page;
 167 }
 168
 169
 170 void Init_VMCB_Real(vmcb_t * vmcb, struct guest_info vm_info) {
 171   vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
 172   vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
 173   uint_t i;
 174
 175
 176   guest_state->rsp = vm_info.vm_regs.rsp;
 177   guest_state->rip = vm_info.rip;
 178
 179
 180
 181
 182
 183   guest_state->efer |= EFER_MSR_svm_enable;
 184   guest_state->rflags = 0x00000002; // The reserved bit is always 1
 185   ctrl_area->svm_instrs.instrs.VMRUN = 1;
 186   // guest_state->cr0 = 0x00000001;    // PE
 187   ctrl_area->guest_ASID = 1;
 188   guest_state->cr0 = 0x60000010;
 189
 190
 191   ctrl_area->exceptions.ex_names.de = 1;
 192   ctrl_area->exceptions.ex_names.df = 1;
 193   ctrl_area->exceptions.ex_names.pf = 1;
 194   ctrl_area->exceptions.ex_names.ts = 1;
 195   ctrl_area->exceptions.ex_names.ss = 1;
 196   ctrl_area->exceptions.ex_names.ac = 1;
 197   ctrl_area->exceptions.ex_names.mc = 1;
 198   ctrl_area->exceptions.ex_names.gp = 1;
 199   ctrl_area->exceptions.ex_names.ud = 1;
 200   ctrl_area->exceptions.ex_names.np = 1;
 201   ctrl_area->exceptions.ex_names.of = 1;
 202   ctrl_area->exceptions.ex_names.nmi = 1;
 203
 204   guest_state->cs.selector = 0xf000;
 205   guest_state->cs.limit=0xffff;
 206   guest_state->cs.base =  0xffff0000;
 207   guest_state->cs.attrib.raw = 0x9a;
 208
 209
 210   struct vmcb_selector *segregs [] = {&(guest_state->ss), &(guest_state->ds), &(guest_state->es), &(guest_state->fs), &(guest_state->gs), NULL};
 211   for ( i = 0; segregs[i] != NULL; i++) {
 212     struct vmcb_selector * seg = segregs[i];
 213
 214     seg->selector = 0x0000;
 215     seg->base = 0xffff0000;
 216     seg->attrib.raw = 0x9b;
 217     seg->limit = 0xffff;
 218   }
 219
 220   /* Set GPRs */
 221   /*
 222     EDX == 0xfxx
 223     EAX, EBX, ECX, ESI, EDI, EBP, ESP == 0x0
 224   */
 225
 226   guest_state->gdtr.base = 0;
 227   guest_state->gdtr.limit = 0xffff;
 228   guest_state->gdtr.attrib.raw = 0x0;
 229
 230   guest_state->idtr.base = 0;
 231   guest_state->idtr.limit = 0xffff;
 232   guest_state->idtr.attrib.raw = 0x0;
 233
 234   guest_state->ldtr.base = 0;
 235   guest_state->ldtr.limit = 0xffff;
 236   guest_state->ldtr.attrib.raw = 0x82;
 237
 238   guest_state->tr.base = 0;
 239   guest_state->tr.limit = 0xffff;
 240   guest_state->tr.attrib.raw = 0x83;
 241
 242
 243
 244
 245   if (vm_info.io_map.num_ports > 0) {
 246     vmm_io_hook_t * iter;
 247     addr_t io_port_bitmap;
 248
 249     io_port_bitmap = (addr_t)os_hooks->allocate_pages(3);
 250     memset((uchar_t*)io_port_bitmap, 0, PAGE_SIZE * 3);
 251
 252     ctrl_area->IOPM_BASE_PA = io_port_bitmap;
 253
 254     //PrintDebug("Setting up IO Map at 0x%x\n", io_port_bitmap);
 255
 256     FOREACH_IO_HOOK(vm_info.io_map, iter) {
 257       ushort_t port = iter->port;
 258       uchar_t * bitmap = (uchar_t *)io_port_bitmap;
 259
 260       bitmap += (port / 8);
 261       PrintDebug("Setting Bit in block %x\n", bitmap);
 262       *bitmap |= 1 << (port % 8);
 263     }
 264
 265     //    memset((uchar_t*)io_port_bitmap, 0xff, PAGE_SIZE * 2);
 266     //PrintDebugMemDump((uchar_t*)io_port_bitmap, PAGE_SIZE *2);
 267
 268     ctrl_area->instrs.instrs.IOIO_PROT = 1;
 269   }
 270
 271   ctrl_area->instrs.instrs.INTR = 1;
 272
 273   // also determine if CPU supports nested paging
 274
 275   if (vm_info.page_mode == SHADOW_PAGING) {
 276     PrintDebug("Creating initial shadow page table\n");
 277     vm_info.shdw_pg_state.shadow_cr3.e_reg.low |= ((addr_t)create_passthrough_pde32_pts(&vm_info) & ~0xfff);
 278     PrintDebug("Created\n");
 279
 280     guest_state->cr3 = vm_info.shdw_pg_state.shadow_cr3.r_reg;
 281
 282     ctrl_area->cr_reads.crs.cr3 = 1;
 283     ctrl_area->cr_writes.crs.cr3 = 1;
 284     ctrl_area->cr_reads.crs.cr0 = 1;
 285     ctrl_area->cr_writes.crs.cr0 = 1;
 286
 287     ctrl_area->instrs.instrs.INVLPG = 1;
 288     ctrl_area->instrs.instrs.INVLPGA = 1;
 289
 290
 291     guest_state->g_pat = 0x7040600070406ULL;
 292
 293     guest_state->cr0 |= 0x80000000;
 294   } else if (vm_info.page_mode == NESTED_PAGING) {
 295     // Flush the TLB on entries/exits
 296     //ctrl_area->TLB_CONTROL = 1;
 297
 298     // Enable Nested Paging
 299     //ctrl_area->NP_ENABLE = 1;
 300
 301     //PrintDebug("NP_Enable at 0x%x\n", &(ctrl_area->NP_ENABLE));
 302
 303         // Set the Nested Page Table pointer
 304     //    ctrl_area->N_CR3 = ((addr_t)vm_info.page_tables);
 305     // ctrl_area->N_CR3 = (addr_t)(vm_info.page_tables);
 306
 307     //   ctrl_area->N_CR3 = Get_CR3();
 308     // guest_state->cr3 |= (Get_CR3() & 0xfffff000);
 309
 310     //    guest_state->g_pat = 0x7040600070406ULL;
 311   }
 312
 313 }
 314
 315
 316 void Init_VMCB(vmcb_t * vmcb, struct guest_info vm_info) {
 317   vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
 318   vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
 319   uint_t i;
 320
 321
 322   guest_state->rsp = vm_info.vm_regs.rsp;
 323   guest_state->rip = vm_info.rip;
 324
 325
 326   //ctrl_area->instrs.instrs.CR0 = 1;
 327   ctrl_area->cr_reads.crs.cr0 = 1;
 328   ctrl_area->cr_writes.crs.cr0 = 1;
 329
 330   guest_state->efer |= EFER_MSR_svm_enable;
 331   guest_state->rflags = 0x00000002; // The reserved bit is always 1
 332   ctrl_area->svm_instrs.instrs.VMRUN = 1;
 333   // guest_state->cr0 = 0x00000001;    // PE
 334   ctrl_area->guest_ASID = 1;
 335
 336
 337   ctrl_area->exceptions.ex_names.de = 1;
 338   ctrl_area->exceptions.ex_names.df = 1;
 339   ctrl_area->exceptions.ex_names.pf = 1;
 340   ctrl_area->exceptions.ex_names.ts = 1;
 341   ctrl_area->exceptions.ex_names.ss = 1;
 342   ctrl_area->exceptions.ex_names.ac = 1;
 343   ctrl_area->exceptions.ex_names.mc = 1;
 344   ctrl_area->exceptions.ex_names.gp = 1;
 345   ctrl_area->exceptions.ex_names.ud = 1;
 346   ctrl_area->exceptions.ex_names.np = 1;
 347   ctrl_area->exceptions.ex_names.of = 1;
 348   ctrl_area->exceptions.ex_names.nmi = 1;
 349
 350   guest_state->cs.selector = 0x0000;
 351   guest_state->cs.limit=~0u;
 352   guest_state->cs.base = guest_state->cs.selector<<4;
 353   guest_state->cs.attrib.raw = 0xf3;
 354
 355
 356   struct vmcb_selector *segregs [] = {&(guest_state->ss), &(guest_state->ds), &(guest_state->es), &(guest_state->fs), &(guest_state->gs), NULL};
 357   for ( i = 0; segregs[i] != NULL; i++) {
 358     struct vmcb_selector * seg = segregs[i];
 359
 360     seg->selector = 0x0000;
 361     seg->base = seg->selector << 4;
 362     seg->attrib.raw = 0xf3;
 363     seg->limit = ~0u;
 364   }
 365
 366   if (vm_info.io_map.num_ports > 0) {
 367     vmm_io_hook_t * iter;
 368     addr_t io_port_bitmap;
 369
 370     io_port_bitmap = (addr_t)os_hooks->allocate_pages(3);
 371     memset((uchar_t*)io_port_bitmap, 0, PAGE_SIZE * 3);
 372
 373     ctrl_area->IOPM_BASE_PA = io_port_bitmap;
 374
 375     //PrintDebug("Setting up IO Map at 0x%x\n", io_port_bitmap);
 376
 377     FOREACH_IO_HOOK(vm_info.io_map, iter) {
 378       ushort_t port = iter->port;
 379       uchar_t * bitmap = (uchar_t *)io_port_bitmap;
 380
 381       bitmap += (port / 8);
 382       PrintDebug("Setting Bit in block %x\n", bitmap);
 383       *bitmap |= 1 << (port % 8);
 384     }
 385
 386
 387     //PrintDebugMemDump((uchar_t*)io_port_bitmap, PAGE_SIZE *2);
 388
 389     ctrl_area->instrs.instrs.IOIO_PROT = 1;
 390   }
 391
 392   ctrl_area->instrs.instrs.INTR = 1;
 393
 394
 395
 396   if (vm_info.page_mode == SHADOW_PAGING) {
 397     PrintDebug("Creating initial shadow page table\n");
 398     vm_info.shdw_pg_state.shadow_cr3.e_reg.low |= ((addr_t)create_passthrough_pde32_pts(&vm_info) & ~0xfff);
 399     PrintDebug("Created\n");
 400
 401     guest_state->cr3 = vm_info.shdw_pg_state.shadow_cr3.r_reg;
 402
 403     ctrl_area->cr_reads.crs.cr3 = 1;
 404     ctrl_area->cr_writes.crs.cr3 = 1;
 405
 406
 407     ctrl_area->instrs.instrs.INVLPG = 1;
 408     ctrl_area->instrs.instrs.INVLPGA = 1;
 409
 410     guest_state->g_pat = 0x7040600070406ULL;
 411
 412     guest_state->cr0 |= 0x80000000;
 413   } else if (vm_info.page_mode == NESTED_PAGING) {
 414     // Flush the TLB on entries/exits
 415     //ctrl_area->TLB_CONTROL = 1;
 416
 417     // Enable Nested Paging
 418     //ctrl_area->NP_ENABLE = 1;
 419
 420     //PrintDebug("NP_Enable at 0x%x\n", &(ctrl_area->NP_ENABLE));
 421
 422         // Set the Nested Page Table pointer
 423     //    ctrl_area->N_CR3 = ((addr_t)vm_info.page_tables);
 424     // ctrl_area->N_CR3 = (addr_t)(vm_info.page_tables);
 425
 426     //   ctrl_area->N_CR3 = Get_CR3();
 427     // guest_state->cr3 |= (Get_CR3() & 0xfffff000);
 428
 429     //    guest_state->g_pat = 0x7040600070406ULL;
 430   }
 431
 432
 433
 434 }
 435
 436 void Init_VMCB_pe(vmcb_t *vmcb, struct guest_info vm_info) {
 437   vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
 438   vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
 439   uint_t i = 0;
 440
 441
 442   guest_state->rsp = vm_info.vm_regs.rsp;
 443   guest_state->rip = vm_info.rip;
 444
 445
 446   /* I pretty much just gutted this from TVMM */
 447   /* Note: That means its probably wrong */
 448
 449   // set the segment registers to mirror ours
 450   guest_state->cs.selector = 1<<3;
 451   guest_state->cs.attrib.fields.type = 0xa; // Code segment+read
 452   guest_state->cs.attrib.fields.S = 1;
 453   guest_state->cs.attrib.fields.P = 1;
 454   guest_state->cs.attrib.fields.db = 1;
 455   guest_state->cs.attrib.fields.G = 1;
 456   guest_state->cs.limit = 0xfffff;
 457   guest_state->cs.base = 0;
 458
 459   struct vmcb_selector *segregs [] = {&(guest_state->ss), &(guest_state->ds), &(guest_state->es), &(guest_state->fs), &(guest_state->gs), NULL};
 460   for ( i = 0; segregs[i] != NULL; i++) {
 461     struct vmcb_selector * seg = segregs[i];
 462
 463     seg->selector = 2<<3;
 464     seg->attrib.fields.type = 0x2; // Data Segment+read/write
 465     seg->attrib.fields.S = 1;
 466     seg->attrib.fields.P = 1;
 467     seg->attrib.fields.db = 1;
 468     seg->attrib.fields.G = 1;
 469     seg->limit = 0xfffff;
 470     seg->base = 0;
 471   }
 472
 473
 474   {
 475     /* JRL THIS HAS TO GO */
 476
 477     guest_state->tr.selector = GetTR_Selector();
 478     guest_state->tr.attrib.fields.type = 0x9;
 479     guest_state->tr.attrib.fields.P = 1;
 480     guest_state->tr.limit = GetTR_Limit();
 481     guest_state->tr.base = GetTR_Base();// - 0x2000;
 482     /* ** */
 483   }
 484
 485
 486   /* ** */
 487
 488
 489   guest_state->efer |= EFER_MSR_svm_enable;
 490   guest_state->rflags = 0x00000002; // The reserved bit is always 1
 491   ctrl_area->svm_instrs.instrs.VMRUN = 1;
 492   guest_state->cr0 = 0x00000001;    // PE
 493   ctrl_area->guest_ASID = 1;
 494
 495
 496   //  guest_state->cpl = 0;
 497
 498
 499
 500   // Setup exits
 501
 502   ctrl_area->cr_writes.crs.cr4 = 1;
 503
 504   ctrl_area->exceptions.ex_names.de = 1;
 505   ctrl_area->exceptions.ex_names.df = 1;
 506   ctrl_area->exceptions.ex_names.pf = 1;
 507   ctrl_area->exceptions.ex_names.ts = 1;
 508   ctrl_area->exceptions.ex_names.ss = 1;
 509   ctrl_area->exceptions.ex_names.ac = 1;
 510   ctrl_area->exceptions.ex_names.mc = 1;
 511   ctrl_area->exceptions.ex_names.gp = 1;
 512   ctrl_area->exceptions.ex_names.ud = 1;
 513   ctrl_area->exceptions.ex_names.np = 1;
 514   ctrl_area->exceptions.ex_names.of = 1;
 515   ctrl_area->exceptions.ex_names.nmi = 1;
 516
 517
 518
 519   ctrl_area->instrs.instrs.IOIO_PROT = 1;
 520   ctrl_area->IOPM_BASE_PA = (uint_t)os_hooks->allocate_pages(3);
 521
 522   {
 523     reg_ex_t tmp_reg;
 524     tmp_reg.r_reg = ctrl_area->IOPM_BASE_PA;
 525     memset((void*)(tmp_reg.e_reg.low), 0xffffffff, PAGE_SIZE * 2);
 526   }
 527
 528   ctrl_area->instrs.instrs.INTR = 1;
 529
 530
 531   {
 532     char gdt_buf[6];
 533     char idt_buf[6];
 534
 535     memset(gdt_buf, 0, 6);
 536     memset(idt_buf, 0, 6);
 537
 538
 539     uint_t gdt_base, idt_base;
 540     ushort_t gdt_limit, idt_limit;
 541
 542     GetGDTR(gdt_buf);
 543     gdt_base = *(ulong_t*)((uchar_t*)gdt_buf + 2) & 0xffffffff;
 544     gdt_limit = *(ushort_t*)(gdt_buf) & 0xffff;
 545     PrintDebug("GDT: base: %x, limit: %x\n", gdt_base, gdt_limit);
 546
 547     GetIDTR(idt_buf);
 548     idt_base = *(ulong_t*)(idt_buf + 2) & 0xffffffff;
 549     idt_limit = *(ushort_t*)(idt_buf) & 0xffff;
 550     PrintDebug("IDT: base: %x, limit: %x\n",idt_base, idt_limit);
 551
 552
 553     // gdt_base -= 0x2000;
 554     //idt_base -= 0x2000;
 555
 556     guest_state->gdtr.base = gdt_base;
 557     guest_state->gdtr.limit = gdt_limit;
 558     guest_state->idtr.base = idt_base;
 559     guest_state->idtr.limit = idt_limit;
 560
 561
 562   }
 563
 564
 565   // also determine if CPU supports nested paging
 566   /*
 567   if (vm_info.page_tables) {
 568     //   if (0) {
 569     // Flush the TLB on entries/exits
 570     ctrl_area->TLB_CONTROL = 1;
 571
 572     // Enable Nested Paging
 573     ctrl_area->NP_ENABLE = 1;
 574
 575     PrintDebug("NP_Enable at 0x%x\n", &(ctrl_area->NP_ENABLE));
 576
 577         // Set the Nested Page Table pointer
 578     ctrl_area->N_CR3 |= ((addr_t)vm_info.page_tables & 0xfffff000);
 579
 580
 581     //   ctrl_area->N_CR3 = Get_CR3();
 582     // guest_state->cr3 |= (Get_CR3() & 0xfffff000);
 583
 584     guest_state->g_pat = 0x7040600070406ULL;
 585
 586     PrintDebug("Set Nested CR3: lo: 0x%x  hi: 0x%x\n", (uint_t)*(&(ctrl_area->N_CR3)), (uint_t)*((unsigned char *)&(ctrl_area->N_CR3) + 4));
 587     PrintDebug("Set Guest CR3: lo: 0x%x  hi: 0x%x\n", (uint_t)*(&(guest_state->cr3)), (uint_t)*((unsigned char *)&(guest_state->cr3) + 4));
 588     // Enable Paging
 589     //    guest_state->cr0 |= 0x80000000;
 590   }
 591   */
 592
 593 }
 594
 595