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   PrintDebug("Initializing VMCB (addr=%x)\n", info->vmm_data);
 116   Init_VMCB((vmcb_t*)(info->vmm_data), *info);
 117
 118   //  info->rip = 0;
 119
 120   info->vm_regs.rdi = 0;
 121   info->vm_regs.rsi = 0;
 122   info->vm_regs.rbp = 0;
 123   info->vm_regs.rsp = 0;
 124   info->vm_regs.rbx = 0;
 125   info->vm_regs.rdx = 0;
 126   info->vm_regs.rcx = 0;
 127   info->vm_regs.rax = 0;
 128
 129   return 0;
 130 }
 131
 132
 133 // can we start a kernel thread here...
 134 int start_svm_guest(struct guest_info *info) {
 135
 136
 137
 138   PrintDebug("Launching SVM VM (vmcb=%x)\n", info->vmm_data);
 139   //PrintDebugVMCB((vmcb_t*)(info->vmm_data));
 140
 141   while (1) {
 142
 143     PrintDebug("SVM Launch Args (vmcb=%x), (info=%x), (vm_regs=%x)\n", info->vmm_data,  &(info->vm_regs));
 144     PrintDebug("Launching to RIP: %x\n", info->rip);
 145     safe_svm_launch((vmcb_t*)(info->vmm_data), &(info->vm_regs));
 146     //launch_svm((vmcb_t*)(info->vmm_data));
 147     PrintDebug("SVM Returned\n");
 148
 149     if (handle_svm_exit(info) != 0) {
 150       // handle exit code....
 151       break;
 152     }
 153   }
 154   return 0;
 155 }
 156
 157
 158
 159 vmcb_t * Allocate_VMCB() {
 160   vmcb_t * vmcb_page = (vmcb_t*)os_hooks->allocate_pages(1);
 161
 162
 163   memset(vmcb_page, 0, 4096);
 164
 165   return vmcb_page;
 166 }
 167
 168
 169 void Init_VMCB_Real(vmcb_t * vmcb, struct guest_info vm_info) {
 170   vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
 171   vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
 172   uint_t i;
 173
 174
 175   guest_state->rsp = vm_info.vm_regs.rsp;
 176   guest_state->rip = vm_info.rip;
 177
 178
 179
 180
 181
 182   guest_state->efer |= EFER_MSR_svm_enable;
 183   guest_state->rflags = 0x00000002; // The reserved bit is always 1
 184   ctrl_area->svm_instrs.instrs.VMRUN = 1;
 185   // guest_state->cr0 = 0x00000001;    // PE
 186   ctrl_area->guest_ASID = 1;
 187   guest_state->cr0 = 0x60000010;
 188
 189
 190   ctrl_area->exceptions.ex_names.de = 1;
 191   ctrl_area->exceptions.ex_names.df = 1;
 192   ctrl_area->exceptions.ex_names.pf = 1;
 193   ctrl_area->exceptions.ex_names.ts = 1;
 194   ctrl_area->exceptions.ex_names.ss = 1;
 195   ctrl_area->exceptions.ex_names.ac = 1;
 196   ctrl_area->exceptions.ex_names.mc = 1;
 197   ctrl_area->exceptions.ex_names.gp = 1;
 198   ctrl_area->exceptions.ex_names.ud = 1;
 199   ctrl_area->exceptions.ex_names.np = 1;
 200   ctrl_area->exceptions.ex_names.of = 1;
 201   ctrl_area->exceptions.ex_names.nmi = 1;
 202
 203   guest_state->cs.selector = 0xf000;
 204   guest_state->cs.limit=0xffff;
 205   guest_state->cs.base =  0xffff0000;
 206   guest_state->cs.attrib.raw = 0x9a;
 207
 208
 209   struct vmcb_selector *segregs [] = {&(guest_state->ss), &(guest_state->ds), &(guest_state->es), &(guest_state->fs), &(guest_state->gs), NULL};
 210   for ( i = 0; segregs[i] != NULL; i++) {
 211     struct vmcb_selector * seg = segregs[i];
 212
 213     seg->selector = 0x0000;
 214     seg->base = 0xffff0000;
 215     seg->attrib.raw = 0x9b;
 216     seg->limit = 0xffff;
 217   }
 218
 219   /* Set GPRs */
 220   /*
 221     EDX == 0xfxx
 222     EAX, EBX, ECX, ESI, EDI, EBP, ESP == 0x0
 223   */
 224
 225   guest_state->gdtr.base = 0;
 226   guest_state->gdtr.limit = 0xffff;
 227   guest_state->gdtr.attrib.raw = 0x0;
 228
 229   guest_state->idtr.base = 0;
 230   guest_state->idtr.limit = 0xffff;
 231   guest_state->idtr.attrib.raw = 0x0;
 232
 233   guest_state->ldtr.base = 0;
 234   guest_state->ldtr.limit = 0xffff;
 235   guest_state->ldtr.attrib.raw = 0x82;
 236
 237   guest_state->tr.base = 0;
 238   guest_state->tr.limit = 0xffff;
 239   guest_state->tr.attrib.raw = 0x83;
 240
 241
 242
 243
 244   if (vm_info.io_map.num_ports > 0) {
 245     vmm_io_hook_t * iter;
 246     addr_t io_port_bitmap;
 247
 248     io_port_bitmap = (addr_t)os_hooks->allocate_pages(3);
 249     memset((uchar_t*)io_port_bitmap, 0, PAGE_SIZE * 3);
 250
 251     ctrl_area->IOPM_BASE_PA = io_port_bitmap;
 252
 253     //PrintDebug("Setting up IO Map at 0x%x\n", io_port_bitmap);
 254
 255     FOREACH_IO_HOOK(vm_info.io_map, iter) {
 256       ushort_t port = iter->port;
 257       uchar_t * bitmap = (uchar_t *)io_port_bitmap;
 258
 259       bitmap += (port / 8);
 260       PrintDebug("Setting Bit in block %x\n", bitmap);
 261       *bitmap |= 1 << (port % 8);
 262     }
 263
 264     ctrl_area->instrs.instrs.IOIO_PROT = 1;
 265   }
 266
 267   ctrl_area->instrs.instrs.INTR = 1;
 268
 269   // also determine if CPU supports nested paging
 270
 271   if (vm_info.page_mode == SHADOW_PAGING) {
 272     PrintDebug("Creating initial shadow page table\n");
 273     vm_info.shdw_pg_state.shadow_cr3.e_reg.low |= ((addr_t)create_passthrough_pde32_pts(&vm_info) & ~0xfff);
 274     PrintDebug("Created\n");
 275
 276     guest_state->cr3 = vm_info.shdw_pg_state.shadow_cr3.r_reg;
 277
 278     ctrl_area->cr_reads.crs.cr3 = 1;
 279     ctrl_area->cr_writes.crs.cr3 = 1;
 280     ctrl_area->cr_reads.crs.cr0 = 1;
 281     ctrl_area->cr_writes.crs.cr0 = 1;
 282
 283     ctrl_area->instrs.instrs.INVLPG = 1;
 284     ctrl_area->instrs.instrs.INVLPGA = 1;
 285
 286
 287     guest_state->g_pat = 0x7040600070406ULL;
 288
 289     guest_state->cr0 |= 0x80000000;
 290   } else if (vm_info.page_mode == NESTED_PAGING) {
 291     // Flush the TLB on entries/exits
 292     //ctrl_area->TLB_CONTROL = 1;
 293
 294     // Enable Nested Paging
 295     //ctrl_area->NP_ENABLE = 1;
 296
 297     //PrintDebug("NP_Enable at 0x%x\n", &(ctrl_area->NP_ENABLE));
 298
 299         // Set the Nested Page Table pointer
 300     //    ctrl_area->N_CR3 = ((addr_t)vm_info.page_tables);
 301     // ctrl_area->N_CR3 = (addr_t)(vm_info.page_tables);
 302
 303     //   ctrl_area->N_CR3 = Get_CR3();
 304     // guest_state->cr3 |= (Get_CR3() & 0xfffff000);
 305
 306     //    guest_state->g_pat = 0x7040600070406ULL;
 307   }
 308
 309 }
 310
 311
 312 void Init_VMCB(vmcb_t * vmcb, struct guest_info vm_info) {
 313   vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
 314   vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
 315   uint_t i;
 316
 317
 318   guest_state->rsp = vm_info.vm_regs.rsp;
 319   guest_state->rip = vm_info.rip;
 320
 321
 322   //ctrl_area->instrs.instrs.CR0 = 1;
 323   ctrl_area->cr_reads.crs.cr0 = 1;
 324   ctrl_area->cr_writes.crs.cr0 = 1;
 325
 326   guest_state->efer |= EFER_MSR_svm_enable;
 327   guest_state->rflags = 0x00000002; // The reserved bit is always 1
 328   ctrl_area->svm_instrs.instrs.VMRUN = 1;
 329   // guest_state->cr0 = 0x00000001;    // PE
 330   ctrl_area->guest_ASID = 1;
 331
 332
 333   ctrl_area->exceptions.ex_names.de = 1;
 334   ctrl_area->exceptions.ex_names.df = 1;
 335   ctrl_area->exceptions.ex_names.pf = 1;
 336   ctrl_area->exceptions.ex_names.ts = 1;
 337   ctrl_area->exceptions.ex_names.ss = 1;
 338   ctrl_area->exceptions.ex_names.ac = 1;
 339   ctrl_area->exceptions.ex_names.mc = 1;
 340   ctrl_area->exceptions.ex_names.gp = 1;
 341   ctrl_area->exceptions.ex_names.ud = 1;
 342   ctrl_area->exceptions.ex_names.np = 1;
 343   ctrl_area->exceptions.ex_names.of = 1;
 344   ctrl_area->exceptions.ex_names.nmi = 1;
 345
 346   guest_state->cs.selector = 0x0000;
 347   guest_state->cs.limit=~0u;
 348   guest_state->cs.base = guest_state->cs.selector<<4;
 349   guest_state->cs.attrib.raw = 0xf3;
 350
 351
 352   struct vmcb_selector *segregs [] = {&(guest_state->ss), &(guest_state->ds), &(guest_state->es), &(guest_state->fs), &(guest_state->gs), NULL};
 353   for ( i = 0; segregs[i] != NULL; i++) {
 354     struct vmcb_selector * seg = segregs[i];
 355
 356     seg->selector = 0x0000;
 357     seg->base = seg->selector << 4;
 358     seg->attrib.raw = 0xf3;
 359     seg->limit = ~0u;
 360   }
 361
 362   if (vm_info.io_map.num_ports > 0) {
 363     vmm_io_hook_t * iter;
 364     addr_t io_port_bitmap;
 365
 366     io_port_bitmap = (addr_t)os_hooks->allocate_pages(3);
 367     memset((uchar_t*)io_port_bitmap, 0, PAGE_SIZE * 3);
 368
 369     ctrl_area->IOPM_BASE_PA = io_port_bitmap;
 370
 371     //PrintDebug("Setting up IO Map at 0x%x\n", io_port_bitmap);
 372
 373     FOREACH_IO_HOOK(vm_info.io_map, iter) {
 374       ushort_t port = iter->port;
 375       uchar_t * bitmap = (uchar_t *)io_port_bitmap;
 376
 377       bitmap += (port / 8);
 378       PrintDebug("Setting Bit in block %x\n", bitmap);
 379       *bitmap |= 1 << (port % 8);
 380     }
 381
 382
 383     //PrintDebugMemDump((uchar_t*)io_port_bitmap, PAGE_SIZE *2);
 384
 385     ctrl_area->instrs.instrs.IOIO_PROT = 1;
 386   }
 387
 388   ctrl_area->instrs.instrs.INTR = 1;
 389
 390
 391
 392   if (vm_info.page_mode == SHADOW_PAGING) {
 393     PrintDebug("Creating initial shadow page table\n");
 394     vm_info.shdw_pg_state.shadow_cr3.e_reg.low |= ((addr_t)create_passthrough_pde32_pts(&vm_info) & ~0xfff);
 395     PrintDebug("Created\n");
 396
 397     guest_state->cr3 = vm_info.shdw_pg_state.shadow_cr3.r_reg;
 398
 399     ctrl_area->cr_reads.crs.cr3 = 1;
 400     ctrl_area->cr_writes.crs.cr3 = 1;
 401
 402
 403     ctrl_area->instrs.instrs.INVLPG = 1;
 404     ctrl_area->instrs.instrs.INVLPGA = 1;
 405
 406     guest_state->g_pat = 0x7040600070406ULL;
 407
 408     guest_state->cr0 |= 0x80000000;
 409   } else if (vm_info.page_mode == NESTED_PAGING) {
 410     // Flush the TLB on entries/exits
 411     //ctrl_area->TLB_CONTROL = 1;
 412
 413     // Enable Nested Paging
 414     //ctrl_area->NP_ENABLE = 1;
 415
 416     //PrintDebug("NP_Enable at 0x%x\n", &(ctrl_area->NP_ENABLE));
 417
 418         // Set the Nested Page Table pointer
 419     //    ctrl_area->N_CR3 = ((addr_t)vm_info.page_tables);
 420     // ctrl_area->N_CR3 = (addr_t)(vm_info.page_tables);
 421
 422     //   ctrl_area->N_CR3 = Get_CR3();
 423     // guest_state->cr3 |= (Get_CR3() & 0xfffff000);
 424
 425     //    guest_state->g_pat = 0x7040600070406ULL;
 426   }
 427
 428
 429
 430 }
 431
 432 void Init_VMCB_pe(vmcb_t *vmcb, struct guest_info vm_info) {
 433   vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
 434   vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
 435   uint_t i = 0;
 436
 437
 438   guest_state->rsp = vm_info.vm_regs.rsp;
 439   guest_state->rip = vm_info.rip;
 440
 441
 442   /* I pretty much just gutted this from TVMM */
 443   /* Note: That means its probably wrong */
 444
 445   // set the segment registers to mirror ours
 446   guest_state->cs.selector = 1<<3;
 447   guest_state->cs.attrib.fields.type = 0xa; // Code segment+read
 448   guest_state->cs.attrib.fields.S = 1;
 449   guest_state->cs.attrib.fields.P = 1;
 450   guest_state->cs.attrib.fields.db = 1;
 451   guest_state->cs.attrib.fields.G = 1;
 452   guest_state->cs.limit = 0xfffff;
 453   guest_state->cs.base = 0;
 454
 455   struct vmcb_selector *segregs [] = {&(guest_state->ss), &(guest_state->ds), &(guest_state->es), &(guest_state->fs), &(guest_state->gs), NULL};
 456   for ( i = 0; segregs[i] != NULL; i++) {
 457     struct vmcb_selector * seg = segregs[i];
 458
 459     seg->selector = 2<<3;
 460     seg->attrib.fields.type = 0x2; // Data Segment+read/write
 461     seg->attrib.fields.S = 1;
 462     seg->attrib.fields.P = 1;
 463     seg->attrib.fields.db = 1;
 464     seg->attrib.fields.G = 1;
 465     seg->limit = 0xfffff;
 466     seg->base = 0;
 467   }
 468
 469
 470   {
 471     /* JRL THIS HAS TO GO */
 472
 473     guest_state->tr.selector = GetTR_Selector();
 474     guest_state->tr.attrib.fields.type = 0x9;
 475     guest_state->tr.attrib.fields.P = 1;
 476     guest_state->tr.limit = GetTR_Limit();
 477     guest_state->tr.base = GetTR_Base();// - 0x2000;
 478     /* ** */
 479   }
 480
 481
 482   /* ** */
 483
 484
 485   guest_state->efer |= EFER_MSR_svm_enable;
 486   guest_state->rflags = 0x00000002; // The reserved bit is always 1
 487   ctrl_area->svm_instrs.instrs.VMRUN = 1;
 488   guest_state->cr0 = 0x00000001;    // PE
 489   ctrl_area->guest_ASID = 1;
 490
 491
 492   //  guest_state->cpl = 0;
 493
 494
 495
 496   // Setup exits
 497
 498   ctrl_area->cr_writes.crs.cr4 = 1;
 499
 500   ctrl_area->exceptions.ex_names.de = 1;
 501   ctrl_area->exceptions.ex_names.df = 1;
 502   ctrl_area->exceptions.ex_names.pf = 1;
 503   ctrl_area->exceptions.ex_names.ts = 1;
 504   ctrl_area->exceptions.ex_names.ss = 1;
 505   ctrl_area->exceptions.ex_names.ac = 1;
 506   ctrl_area->exceptions.ex_names.mc = 1;
 507   ctrl_area->exceptions.ex_names.gp = 1;
 508   ctrl_area->exceptions.ex_names.ud = 1;
 509   ctrl_area->exceptions.ex_names.np = 1;
 510   ctrl_area->exceptions.ex_names.of = 1;
 511   ctrl_area->exceptions.ex_names.nmi = 1;
 512
 513
 514
 515   ctrl_area->instrs.instrs.IOIO_PROT = 1;
 516   ctrl_area->IOPM_BASE_PA = (uint_t)os_hooks->allocate_pages(3);
 517
 518   {
 519     reg_ex_t tmp_reg;
 520     tmp_reg.r_reg = ctrl_area->IOPM_BASE_PA;
 521     memset((void*)(tmp_reg.e_reg.low), 0xffffffff, PAGE_SIZE * 2);
 522   }
 523
 524   ctrl_area->instrs.instrs.INTR = 1;
 525
 526
 527   {
 528     char gdt_buf[6];
 529     char idt_buf[6];
 530
 531     memset(gdt_buf, 0, 6);
 532     memset(idt_buf, 0, 6);
 533
 534
 535     uint_t gdt_base, idt_base;
 536     ushort_t gdt_limit, idt_limit;
 537
 538     GetGDTR(gdt_buf);
 539     gdt_base = *(ulong_t*)((uchar_t*)gdt_buf + 2) & 0xffffffff;
 540     gdt_limit = *(ushort_t*)(gdt_buf) & 0xffff;
 541     PrintDebug("GDT: base: %x, limit: %x\n", gdt_base, gdt_limit);
 542
 543     GetIDTR(idt_buf);
 544     idt_base = *(ulong_t*)(idt_buf + 2) & 0xffffffff;
 545     idt_limit = *(ushort_t*)(idt_buf) & 0xffff;
 546     PrintDebug("IDT: base: %x, limit: %x\n",idt_base, idt_limit);
 547
 548
 549     // gdt_base -= 0x2000;
 550     //idt_base -= 0x2000;
 551
 552     guest_state->gdtr.base = gdt_base;
 553     guest_state->gdtr.limit = gdt_limit;
 554     guest_state->idtr.base = idt_base;
 555     guest_state->idtr.limit = idt_limit;
 556
 557
 558   }
 559
 560
 561   // also determine if CPU supports nested paging
 562   /*
 563   if (vm_info.page_tables) {
 564     //   if (0) {
 565     // Flush the TLB on entries/exits
 566     ctrl_area->TLB_CONTROL = 1;
 567
 568     // Enable Nested Paging
 569     ctrl_area->NP_ENABLE = 1;
 570
 571     PrintDebug("NP_Enable at 0x%x\n", &(ctrl_area->NP_ENABLE));
 572
 573         // Set the Nested Page Table pointer
 574     ctrl_area->N_CR3 |= ((addr_t)vm_info.page_tables & 0xfffff000);
 575
 576
 577     //   ctrl_area->N_CR3 = Get_CR3();
 578     // guest_state->cr3 |= (Get_CR3() & 0xfffff000);
 579
 580     guest_state->g_pat = 0x7040600070406ULL;
 581
 582     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));
 583     PrintDebug("Set Guest CR3: lo: 0x%x  hi: 0x%x\n", (uint_t)*(&(guest_state->cr3)), (uint_t)*((unsigned char *)&(guest_state->cr3) + 4));
 584     // Enable Paging
 585     //    guest_state->cr0 |= 0x80000000;
 586   }
 587   */
 588
 589 }
 590
 591