palacios/src/palacios/vmx.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, Peter Dinda <pdinda@northwestern.edu>
  11  * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
  12  * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
  13  * All rights reserved.
  14  *
  15  * Author: Peter Dinda <pdinda@northwestern.edu>
  16  *         Jack Lange <jarusl@cs.northwestern.edu>
  17  *
  18  * This is free software.  You are permitted to use,
  19  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  20  */
  21
  22
  23 #include <palacios/vmx.h>
  24 #include <palacios/vmm.h>
  25 #include <palacios/vmx_handler.h>
  26 #include <palacios/vmcs.h>
  27 #include <palacios/vmx_lowlevel.h>
  28 #include <palacios/vmm_lowlevel.h>
  29 #include <palacios/vmm_ctrl_regs.h>
  30 #include <palacios/vmm_config.h>
  31 #include <palacios/vm_guest_mem.h>
  32 #include <palacios/vmm_direct_paging.h>
  33 #include <palacios/vmx_io.h>
  34 #include <palacios/vmx_msr.h>
  35
  36 static addr_t host_vmcs_ptrs[CONFIG_MAX_CPUS] = { [0 ... CONFIG_MAX_CPUS - 1] = 0};
  37
  38
  39
  40 extern int v3_vmx_launch(struct v3_gprs * vm_regs, struct guest_info * info, struct v3_ctrl_regs * ctrl_regs);
  41 extern int v3_vmx_resume(struct v3_gprs * vm_regs, struct guest_info * info, struct v3_ctrl_regs * ctrl_regs);
  42
  43 static int inline check_vmcs_write(vmcs_field_t field, addr_t val) {
  44     int ret = 0;
  45
  46     ret = vmcs_write(field,val);
  47
  48     if (ret != VMX_SUCCESS) {
  49         PrintError("VMWRITE error on %s!: %d\n", v3_vmcs_field_to_str(field), ret);
  50         return 1;
  51     }
  52
  53     return 0;
  54 }
  55
  56 static int inline check_vmcs_read(vmcs_field_t field, void * val) {
  57     int ret = 0;
  58
  59     ret = vmcs_read(field, val);
  60
  61     if (ret != VMX_SUCCESS) {
  62         PrintError("VMREAD error on %s!: %d\n", v3_vmcs_field_to_str(field), ret);
  63     }
  64
  65     return ret;
  66 }
  67
  68 #if 0
  69 // For the 32 bit reserved bit fields
  70 // MB1s are in the low 32 bits, MBZs are in the high 32 bits of the MSR
  71 static uint32_t sanitize_bits1(uint32_t msr_num, uint32_t val) {
  72     v3_msr_t mask_msr;
  73
  74     PrintDebug("sanitize_bits1 (MSR:%x)\n", msr_num);
  75
  76     v3_get_msr(msr_num, &mask_msr.hi, &mask_msr.lo);
  77
  78     PrintDebug("MSR %x = %x : %x \n", msr_num, mask_msr.hi, mask_msr.lo);
  79
  80     val |= mask_msr.lo;
  81     val |= mask_msr.hi;
  82
  83     return val;
  84 }
  85
  86
  87
  88 static addr_t sanitize_bits2(uint32_t msr_num0, uint32_t msr_num1, addr_t val) {
  89     v3_msr_t msr0, msr1;
  90     addr_t msr0_val, msr1_val;
  91
  92     PrintDebug("sanitize_bits2 (MSR0=%x, MSR1=%x)\n", msr_num0, msr_num1);
  93
  94     v3_get_msr(msr_num0, &msr0.hi, &msr0.lo);
  95     v3_get_msr(msr_num1, &msr1.hi, &msr1.lo);
  96
  97     // This generates a mask that is the natural bit width of the CPU
  98     msr0_val = msr0.value;
  99     msr1_val = msr1.value;
 100
 101     PrintDebug("MSR %x = %p, %x = %p \n", msr_num0, (void*)msr0_val, msr_num1, (void*)msr1_val);
 102
 103     val |= msr0_val;
 104     val |= msr1_val;
 105
 106     return val;
 107 }
 108
 109
 110
 111 #endif
 112
 113
 114 static addr_t allocate_vmcs() {
 115     reg_ex_t msr;
 116     struct vmcs_data * vmcs_page = NULL;
 117
 118     PrintDebug("Allocating page\n");
 119
 120     vmcs_page = (struct vmcs_data *)V3_VAddr(V3_AllocPages(1));
 121     memset(vmcs_page, 0, 4096);
 122
 123     v3_get_msr(VMX_BASIC_MSR, &(msr.e_reg.high), &(msr.e_reg.low));
 124
 125     vmcs_page->revision = ((struct vmx_basic_msr*)&msr)->revision;
 126     PrintDebug("VMX Revision: 0x%x\n",vmcs_page->revision);
 127
 128     return (addr_t)V3_PAddr((void *)vmcs_page);
 129 }
 130
 131
 132
 133
 134 static int init_vmcs_bios(struct guest_info * info, struct vmx_data * vmx_state) {
 135     int vmx_ret = 0;
 136
 137     PrintDebug("Loading VMCS\n");
 138     vmx_ret = vmcs_load(vmx_state->vmcs_ptr_phys);
 139
 140     if (vmx_ret != VMX_SUCCESS) {
 141         PrintError("VMPTRLD failed\n");
 142         return -1;
 143     }
 144
 145
 146
 147     /******* Setup Host State **********/
 148
 149     /* Cache GDTR, IDTR, and TR in host struct */
 150     addr_t gdtr_base;
 151     struct {
 152         uint16_t selector;
 153         addr_t   base;
 154     } __attribute__((packed)) tmp_seg;
 155
 156
 157     __asm__ __volatile__(
 158                          "sgdt (%0);"
 159                          :
 160                          : "q"(&tmp_seg)
 161                          : "memory"
 162                          );
 163     gdtr_base = tmp_seg.base;
 164     vmx_state->host_state.gdtr.base = gdtr_base;
 165
 166     __asm__ __volatile__(
 167                          "sidt (%0);"
 168                          :
 169                          : "q"(&tmp_seg)
 170                          : "memory"
 171                          );
 172     vmx_state->host_state.idtr.base = tmp_seg.base;
 173
 174     __asm__ __volatile__(
 175                          "str (%0);"
 176                          :
 177                          : "q"(&tmp_seg)
 178                          : "memory"
 179                          );
 180     vmx_state->host_state.tr.selector = tmp_seg.selector;
 181
 182     /* The GDTR *index* is bits 3-15 of the selector. */
 183     struct tss_descriptor * desc = NULL;
 184     desc = (struct tss_descriptor *)(gdtr_base + (8 * (tmp_seg.selector >> 3)));
 185
 186     tmp_seg.base = ((desc->base1) |
 187                     (desc->base2 << 16) |
 188                     (desc->base3 << 24) |
 189 #ifdef __V3_64BIT__
 190                     ((uint64_t)desc->base4 << 32)
 191 #else
 192                     (0)
 193 #endif
 194                     );
 195
 196     vmx_state->host_state.tr.base = tmp_seg.base;
 197
 198
 199
 200     /********** Setup and VMX Control Fields from MSR ***********/
 201     /* Setup IO map */
 202     v3_init_vmx_io_map(info);
 203     v3_init_vmx_msr_map(info);
 204
 205     struct v3_msr tmp_msr;
 206
 207     v3_get_msr(VMX_PINBASED_CTLS_MSR, &(tmp_msr.hi), &(tmp_msr.lo));
 208
 209     /* Add external interrupts, NMI exiting, and virtual NMI */
 210     vmx_state->pin_ctrls.value =  tmp_msr.lo;
 211     vmx_state->pin_ctrls.nmi_exit = 1;
 212     vmx_state->pin_ctrls.ext_int_exit = 1;
 213
 214     v3_get_msr(VMX_PROCBASED_CTLS_MSR, &(tmp_msr.hi), &(tmp_msr.lo));
 215
 216     vmx_state->pri_proc_ctrls.value = tmp_msr.lo;
 217     vmx_state->pri_proc_ctrls.use_io_bitmap = 1;
 218     vmx_state->pri_proc_ctrls.hlt_exit = 1;
 219     vmx_state->pri_proc_ctrls.invlpg_exit = 1;
 220     vmx_state->pri_proc_ctrls.use_msr_bitmap = 1;
 221     vmx_state->pri_proc_ctrls.pause_exit = 1;
 222
 223     vmx_ret |= check_vmcs_write(VMCS_IO_BITMAP_A_ADDR, (addr_t)V3_PAddr(info->io_map.arch_data));
 224     vmx_ret |= check_vmcs_write(VMCS_IO_BITMAP_B_ADDR,
 225             (addr_t)V3_PAddr(info->io_map.arch_data) + PAGE_SIZE_4KB);
 226
 227     vmx_ret |= check_vmcs_write(VMCS_MSR_BITMAP, (addr_t)V3_PAddr(info->msr_map.arch_data));
 228
 229     v3_get_msr(VMX_EXIT_CTLS_MSR, &(tmp_msr.hi), &(tmp_msr.lo));
 230     vmx_state->exit_ctrls.value = tmp_msr.lo;
 231     vmx_state->exit_ctrls.host_64_on = 1;
 232
 233     if ((vmx_state->exit_ctrls.save_efer == 1) || (vmx_state->exit_ctrls.ld_efer == 1)) {
 234         vmx_state->ia32e_avail = 1;
 235     }
 236
 237     v3_get_msr(VMX_ENTRY_CTLS_MSR, &(tmp_msr.hi), &(tmp_msr.lo));
 238     vmx_state->entry_ctrls.value = tmp_msr.lo;
 239
 240     {
 241         struct vmx_exception_bitmap excp_bmap;
 242         excp_bmap.value = 0;
 243
 244         excp_bmap.pf = 1;
 245
 246         vmx_ret |= check_vmcs_write(VMCS_EXCP_BITMAP, excp_bmap.value);
 247     }
 248     /******* Setup VMXAssist guest state ***********/
 249
 250     info->rip = 0xd0000;
 251     info->vm_regs.rsp = 0x80000;
 252
 253     struct rflags * flags = (struct rflags *)&(info->ctrl_regs.rflags);
 254     flags->rsvd1 = 1;
 255
 256     /* Print Control MSRs */
 257     v3_get_msr(VMX_CR0_FIXED0_MSR, &(tmp_msr.hi), &(tmp_msr.lo));
 258     PrintDebug("CR0 MSR: %p\n", (void *)(addr_t)tmp_msr.value);
 259
 260     v3_get_msr(VMX_CR4_FIXED0_MSR, &(tmp_msr.hi), &(tmp_msr.lo));
 261     PrintDebug("CR4 MSR: %p\n", (void *)(addr_t)tmp_msr.value);
 262
 263
 264 #define GUEST_CR0 0x80000031
 265 #define GUEST_CR4 0x00002000
 266     info->ctrl_regs.cr0 = GUEST_CR0;
 267     info->ctrl_regs.cr4 = GUEST_CR4;
 268
 269     ((struct cr0_32 *)&(info->shdw_pg_state.guest_cr0))->pe = 1;
 270
 271     /* Setup paging */
 272     if (info->shdw_pg_mode == SHADOW_PAGING) {
 273         PrintDebug("Creating initial shadow page table\n");
 274
 275         if (v3_init_passthrough_pts(info) == -1) {
 276             PrintError("Could not initialize passthrough page tables\n");
 277             return -1;
 278         }
 279
 280 #define CR0_PE 0x00000001
 281 #define CR0_PG 0x80000000
 282
 283
 284         vmx_ret |= check_vmcs_write(VMCS_CR0_MASK, (CR0_PE | CR0_PG) );
 285         vmx_ret |= check_vmcs_write(VMCS_CR4_MASK, CR4_VMXE);
 286
 287         info->ctrl_regs.cr3 = info->direct_map_pt;
 288
 289         // vmx_state->pinbased_ctrls |= NMI_EXIT;
 290
 291         /* Add CR exits */
 292         vmx_state->pri_proc_ctrls.cr3_ld_exit = 1;
 293         vmx_state->pri_proc_ctrls.cr3_str_exit = 1;
 294     }
 295
 296     // Setup segment registers
 297     {
 298         struct v3_segment * seg_reg = (struct v3_segment *)&(info->segments);
 299
 300         int i;
 301
 302         for (i = 0; i < 10; i++) {
 303             seg_reg[i].selector = 3 << 3;
 304             seg_reg[i].limit = 0xffff;
 305             seg_reg[i].base = 0x0;
 306         }
 307
 308         info->segments.cs.selector = 2<<3;
 309
 310         /* Set only the segment registers */
 311         for (i = 0; i < 6; i++) {
 312             seg_reg[i].limit = 0xfffff;
 313             seg_reg[i].granularity = 1;
 314             seg_reg[i].type = 3;
 315             seg_reg[i].system = 1;
 316             seg_reg[i].dpl = 0;
 317             seg_reg[i].present = 1;
 318             seg_reg[i].db = 1;
 319         }
 320
 321         info->segments.cs.type = 0xb;
 322
 323         info->segments.ldtr.selector = 0x20;
 324         info->segments.ldtr.type = 2;
 325         info->segments.ldtr.system = 0;
 326         info->segments.ldtr.present = 1;
 327         info->segments.ldtr.granularity = 0;
 328
 329
 330         /************* Map in GDT and vmxassist *************/
 331
 332         uint64_t  gdt[] __attribute__ ((aligned(32))) = {
 333             0x0000000000000000ULL,              /* 0x00: reserved */
 334             0x0000830000000000ULL,              /* 0x08: 32-bit TSS */
 335             //0x0000890000000000ULL,            /* 0x08: 32-bit TSS */
 336             0x00CF9b000000FFFFULL,              /* 0x10: CS 32-bit */
 337             0x00CF93000000FFFFULL,              /* 0x18: DS 32-bit */
 338             0x000082000000FFFFULL,              /* 0x20: LDTR 32-bit */
 339         };
 340
 341 #define VMXASSIST_GDT   0x10000
 342         addr_t vmxassist_gdt = 0;
 343
 344         if (guest_pa_to_host_va(info, VMXASSIST_GDT, &vmxassist_gdt) == -1) {
 345             PrintError("Could not find VMXASSIST GDT destination\n");
 346             return -1;
 347         }
 348
 349         memcpy((void *)vmxassist_gdt, gdt, sizeof(uint64_t) * 5);
 350
 351         info->segments.gdtr.base = VMXASSIST_GDT;
 352
 353 #define VMXASSIST_TSS   0x40000
 354         uint64_t vmxassist_tss = VMXASSIST_TSS;
 355         gdt[0x08 / sizeof(gdt[0])] |=
 356             ((vmxassist_tss & 0xFF000000) << (56 - 24)) |
 357             ((vmxassist_tss & 0x00FF0000) << (32 - 16)) |
 358             ((vmxassist_tss & 0x0000FFFF) << (16)) |
 359             (8392 - 1);
 360
 361         info->segments.tr.selector = 0x08;
 362         info->segments.tr.base = vmxassist_tss;
 363
 364         //info->segments.tr.type = 0x9;
 365         info->segments.tr.type = 0x3;
 366         info->segments.tr.system = 0;
 367         info->segments.tr.present = 1;
 368         info->segments.tr.granularity = 0;
 369     }
 370
 371     // setup VMXASSIST
 372     {
 373 #define VMXASSIST_START 0x000d0000
 374         extern uint8_t v3_vmxassist_start[];
 375         extern uint8_t v3_vmxassist_end[];
 376         addr_t vmxassist_dst = 0;
 377
 378         if (guest_pa_to_host_va(info, VMXASSIST_START, &vmxassist_dst) == -1) {
 379             PrintError("Could not find VMXASSIST destination\n");
 380             return -1;
 381         }
 382
 383         memcpy((void *)vmxassist_dst, v3_vmxassist_start, v3_vmxassist_end - v3_vmxassist_start);
 384     }
 385
 386     /*** Write all the info to the VMCS ***/
 387
 388 #define DEBUGCTL_MSR 0x1d9
 389     v3_get_msr(DEBUGCTL_MSR, &(tmp_msr.hi), &(tmp_msr.lo));
 390     vmx_ret |= check_vmcs_write(VMCS_GUEST_DBG_CTL, tmp_msr.value);
 391
 392     info->dbg_regs.dr7 = 0x400;
 393
 394     vmx_ret |= check_vmcs_write(VMCS_LINK_PTR, (addr_t)0xffffffffffffffffULL);
 395
 396
 397     if (v3_update_vmcs_ctrl_fields(info)) {
 398         PrintError("Could not write control fields!\n");
 399         return -1;
 400     }
 401
 402     if (v3_update_vmcs_host_state(info)) {
 403         PrintError("Could not write host state\n");
 404         return -1;
 405     }
 406
 407
 408     vmx_state->state = VMXASSIST_DISABLED;
 409
 410     return 0;
 411 }
 412
 413 int v3_init_vmx_vmcs(struct guest_info * info, v3_vm_class_t vm_class) {
 414     struct vmx_data * vmx_state = NULL;
 415     int vmx_ret = 0;
 416
 417     vmx_state = (struct vmx_data *)V3_Malloc(sizeof(struct vmx_data));
 418
 419     PrintDebug("vmx_data pointer: %p\n", (void *)vmx_state);
 420
 421     PrintDebug("Allocating VMCS\n");
 422     vmx_state->vmcs_ptr_phys = allocate_vmcs();
 423
 424     PrintDebug("VMCS pointer: %p\n", (void *)(vmx_state->vmcs_ptr_phys));
 425
 426     info->vmm_data = vmx_state;
 427
 428     PrintDebug("Initializing VMCS (addr=%p)\n", info->vmm_data);
 429
 430     // TODO: Fix vmcs fields so they're 32-bit
 431
 432     PrintDebug("Clearing VMCS: %p\n", (void *)vmx_state->vmcs_ptr_phys);
 433     vmx_ret = vmcs_clear(vmx_state->vmcs_ptr_phys);
 434
 435     if (vmx_ret != VMX_SUCCESS) {
 436         PrintError("VMCLEAR failed\n");
 437         return -1;
 438     }
 439
 440     if (vm_class == V3_PC_VM) {
 441         PrintDebug("Initializing VMCS\n");
 442         init_vmcs_bios(info, vmx_state);
 443     } else {
 444         PrintError("Invalid VM Class\n");
 445         return -1;
 446     }
 447
 448     return 0;
 449 }
 450
 451 static int update_irq_exit_state(struct guest_info * info) {
 452     struct vmx_exit_idt_vec_info idt_vec_info;
 453
 454     check_vmcs_read(VMCS_IDT_VECTOR_INFO, &(idt_vec_info.value));
 455
 456     if ((info->intr_state.irq_started == 1) && (idt_vec_info.valid == 0)) {
 457 #ifdef CONFIG_DEBUG_INTERRUPTS
 458         PrintDebug("Calling v3_injecting_intr\n");
 459 #endif
 460         info->intr_state.irq_started = 0;
 461         v3_injecting_intr(info, info->intr_state.irq_vector, V3_EXTERNAL_IRQ);
 462     }
 463
 464     return 0;
 465 }
 466
 467 static int update_irq_entry_state(struct guest_info * info) {
 468     struct vmx_exit_idt_vec_info idt_vec_info;
 469     struct vmx_data * vmx_info = (struct vmx_data *)(info->vmm_data);
 470
 471     check_vmcs_read(VMCS_IDT_VECTOR_INFO, &(idt_vec_info.value));
 472
 473     /* Check for pending exceptions to inject */
 474     if (v3_excp_pending(info)) {
 475         struct vmx_entry_int_info int_info;
 476         int_info.value = 0;
 477
 478         // In VMX, almost every exception is hardware
 479         // Software exceptions are pretty much only for breakpoint or overflow
 480         int_info.type = 3;
 481         int_info.vector = v3_get_excp_number(info);
 482
 483         if (info->excp_state.excp_error_code_valid) {
 484             check_vmcs_write(VMCS_ENTRY_EXCP_ERR, info->excp_state.excp_error_code);
 485             int_info.error_code = 1;
 486
 487 #ifdef CONFIG_DEBUG_INTERRUPTS
 488             PrintDebug("Injecting exception %d with error code %x\n",
 489                     int_info.vector, info->excp_state.excp_error_code);
 490 #endif
 491         }
 492
 493         int_info.valid = 1;
 494 #ifdef CONFIG_DEBUG_INTERRUPTS
 495         PrintDebug("Injecting exception %d (EIP=%p)\n", int_info.vector, (void *)info->rip);
 496 #endif
 497         check_vmcs_write(VMCS_ENTRY_INT_INFO, int_info.value);
 498
 499         v3_injecting_excp(info, int_info.vector);
 500
 501     } else if (((struct rflags *)&(info->ctrl_regs.rflags))->intr == 1) {
 502
 503         if ((info->intr_state.irq_started == 1) && (idt_vec_info.valid == 1)) {
 504
 505 #ifdef CONFIG_DEBUG_INTERRUPTS
 506             PrintDebug("IRQ pending from previous injection\n");
 507 #endif
 508
 509             // Copy the IDT vectoring info over to reinject the old interrupt
 510             if (idt_vec_info.error_code == 1) {
 511                 uint32_t err_code = 0;
 512
 513                 check_vmcs_read(VMCS_IDT_VECTOR_ERR, &err_code);
 514                 check_vmcs_write(VMCS_ENTRY_EXCP_ERR, err_code);
 515             }
 516
 517             idt_vec_info.undef = 0;
 518             check_vmcs_write(VMCS_ENTRY_INT_INFO, idt_vec_info.value);
 519
 520         } else {
 521             struct vmx_entry_int_info ent_int;
 522             ent_int.value = 0;
 523
 524             switch (v3_intr_pending(info)) {
 525                 case V3_EXTERNAL_IRQ: {
 526                     info->intr_state.irq_vector = v3_get_intr(info);
 527                     ent_int.vector = info->intr_state.irq_vector;
 528                     ent_int.type = 0;
 529                     ent_int.error_code = 0;
 530                     ent_int.valid = 1;
 531
 532 #ifdef CONFIG_DEBUG_INTERRUPTS
 533                     PrintDebug("Injecting Interrupt %d at exit %u(EIP=%p)\n",
 534                                info->intr_state.irq_vector,
 535                                (uint32_t)info->num_exits,
 536                                (void *)info->rip);
 537 #endif
 538
 539                     check_vmcs_write(VMCS_ENTRY_INT_INFO, ent_int.value);
 540                     info->intr_state.irq_started = 1;
 541
 542                     break;
 543                 }
 544                 case V3_NMI:
 545                     PrintDebug("Injecting NMI\n");
 546
 547                     ent_int.type = 2;
 548                     ent_int.vector = 2;
 549                     ent_int.valid = 1;
 550                     check_vmcs_write(VMCS_ENTRY_INT_INFO, ent_int.value);
 551
 552                     break;
 553                 case V3_SOFTWARE_INTR:
 554                     PrintDebug("Injecting software interrupt\n");
 555                     ent_int.type = 4;
 556
 557                     ent_int.valid = 1;
 558                     check_vmcs_write(VMCS_ENTRY_INT_INFO, ent_int.value);
 559
 560                     break;
 561                 case V3_VIRTUAL_IRQ:
 562                     // Not sure what to do here, Intel doesn't have virtual IRQs
 563                     // May be the same as external interrupts/IRQs
 564
 565                     break;
 566                 case V3_INVALID_INTR:
 567                 default:
 568                     break;
 569             }
 570         }
 571     } else if ((v3_intr_pending(info)) && (vmx_info->pri_proc_ctrls.int_wndw_exit == 0)) {
 572         // Enable INTR window exiting so we know when IF=1
 573         uint32_t instr_len;
 574
 575         check_vmcs_read(VMCS_EXIT_INSTR_LEN, &instr_len);
 576
 577 #ifdef CONFIG_DEBUG_INTERRUPTS
 578         PrintDebug("Enabling Interrupt-Window exiting: %d\n", instr_len);
 579 #endif
 580
 581         vmx_info->pri_proc_ctrls.int_wndw_exit = 1;
 582         check_vmcs_write(VMCS_PROC_CTRLS, vmx_info->pri_proc_ctrls.value);
 583     }
 584
 585
 586     return 0;
 587 }
 588
 589
 590 /*
 591  * CAUTION and DANGER!!!
 592  *
 593  * The VMCS CANNOT(!!) be accessed outside of the cli/sti calls inside this function
 594  * When exectuing a symbiotic call, the VMCS WILL be overwritten, so any dependencies
 595  * on its contents will cause things to break. The contents at the time of the exit WILL
 596  * change before the exit handler is executed.
 597  */
 598 int v3_vmx_enter(struct guest_info * info) {
 599     int ret = 0;
 600     uint64_t tmp_tsc = 0;
 601     struct vmx_exit_info exit_info;
 602
 603     // Conditionally yield the CPU if the timeslice has expired
 604     v3_yield_cond(info);
 605
 606
 607     // v3_print_guest_state(info);
 608
 609     // disable global interrupts for vm state transition
 610     v3_disable_ints();
 611
 612     v3_vmx_restore_vmcs(info);
 613
 614
 615 #ifdef CONFIG_SYMBIOTIC
 616     if (info->sym_state.sym_call_active == 0) {
 617         update_irq_entry_state(info);
 618     }
 619 #else
 620     update_irq_entry_state(info);
 621 #endif
 622
 623
 624     rdtscll(info->time_state.cached_host_tsc);
 625
 626     if (info->run_state == VM_STOPPED) {
 627         info->run_state = VM_RUNNING;
 628         ret = v3_vmx_launch(&(info->vm_regs), info, &(info->ctrl_regs));
 629     } else {
 630         ret = v3_vmx_resume(&(info->vm_regs), info, &(info->ctrl_regs));
 631     }
 632
 633     //  PrintDebug("VMX Exit: ret=%d\n", ret);
 634
 635     if (ret != VMX_SUCCESS) {
 636         uint32_t error = 0;
 637
 638         vmcs_read(VMCS_INSTR_ERR, &error);
 639         PrintError("VMENTRY Error: %d\n", error);
 640
 641         return -1;
 642     }
 643
 644     rdtscll(tmp_tsc);
 645
 646     info->num_exits++;
 647
 648     v3_update_time(info, tmp_tsc - info->time_state.cached_host_tsc);
 649
 650     /* Update guest state */
 651     v3_vmx_save_vmcs(info);
 652
 653     info->mem_mode = v3_get_vm_mem_mode(info);
 654     info->cpu_mode = v3_get_vm_cpu_mode(info);
 655
 656
 657     check_vmcs_read(VMCS_EXIT_INSTR_LEN, &(exit_info.instr_len));
 658     check_vmcs_read(VMCS_EXIT_INSTR_INFO, &(exit_info.instr_info));
 659     check_vmcs_read(VMCS_EXIT_REASON, &(exit_info.exit_reason));
 660     check_vmcs_read(VMCS_EXIT_QUAL, &(exit_info.exit_qual));
 661     check_vmcs_read(VMCS_EXIT_INT_INFO, &(exit_info.int_info));
 662     check_vmcs_read(VMCS_EXIT_INT_ERR, &(exit_info.int_err));
 663     check_vmcs_read(VMCS_GUEST_LINEAR_ADDR, &(exit_info.guest_linear_addr));
 664
 665     //PrintDebug("VMX Exit taken, id-qual: %u-%lu\n", exit_info.exit_reason, exit_info.exit_qual);
 666
 667
 668 #ifdef CONFIG_SYMBIOTIC
 669     if (info->sym_state.sym_call_active == 0) {
 670         update_irq_exit_state(info);
 671     }
 672 #else
 673     update_irq_exit_state(info);
 674 #endif
 675
 676     // reenable global interrupts after vm exit
 677     v3_enable_ints();
 678
 679     // Conditionally yield the CPU if the timeslice has expired
 680     v3_yield_cond(info);
 681
 682     if (v3_handle_vmx_exit(info, &exit_info) == -1) {
 683         PrintError("Error in VMX exit handler\n");
 684         return -1;
 685     }
 686
 687     return 0;
 688 }
 689
 690
 691 int v3_start_vmx_guest(struct guest_info* info) {
 692
 693
 694     PrintDebug("Launching VMX guest\n");
 695
 696     rdtscll(info->time_state.cached_host_tsc);
 697
 698
 699     while (1) {
 700         if (v3_vmx_enter(info) == -1) {
 701             v3_print_vmcs();
 702             return -1;
 703         }
 704
 705         if ((info->num_exits % 5000) == 0) {
 706             V3_Print("SVM Exit number %d\n", (uint32_t)info->num_exits);
 707         }
 708     }
 709
 710     return 0;
 711 }
 712
 713
 714 int v3_is_vmx_capable() {
 715     v3_msr_t feature_msr;
 716     uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0;
 717
 718     v3_cpuid(0x1, &eax, &ebx, &ecx, &edx);
 719
 720     PrintDebug("ECX: 0x%x\n", ecx);
 721
 722     if (ecx & CPUID_1_ECX_VTXFLAG) {
 723         v3_get_msr(VMX_FEATURE_CONTROL_MSR, &(feature_msr.hi), &(feature_msr.lo));
 724
 725         PrintDebug("MSRREGlow: 0x%.8x\n", feature_msr.lo);
 726
 727         if ((feature_msr.lo & FEATURE_CONTROL_VALID) != FEATURE_CONTROL_VALID) {
 728             PrintDebug("VMX is locked -- enable in the BIOS\n");
 729             return 0;
 730         }
 731
 732     } else {
 733         PrintDebug("VMX not supported on this cpu\n");
 734         return 0;
 735     }
 736
 737     return 1;
 738 }
 739
 740 static int has_vmx_nested_paging() {
 741     return 0;
 742 }
 743
 744
 745
 746 void v3_init_vmx_cpu(int cpu_id) {
 747     extern v3_cpu_arch_t v3_cpu_types[];
 748     struct v3_msr tmp_msr;
 749     uint64_t ret = 0;
 750
 751     v3_get_msr(VMX_CR4_FIXED0_MSR,&(tmp_msr.hi),&(tmp_msr.lo));
 752
 753     __asm__ __volatile__ (
 754                           "movq %%cr4, %%rbx;"
 755                           "orq  $0x00002000, %%rbx;"
 756                           "movq %%rbx, %0;"
 757                           : "=m"(ret)
 758                           :
 759                           : "%rbx"
 760                           );
 761
 762     if ((~ret & tmp_msr.value) == 0) {
 763         __asm__ __volatile__ (
 764                               "movq %0, %%cr4;"
 765                               :
 766                               : "q"(ret)
 767                               );
 768     } else {
 769         PrintError("Invalid CR4 Settings!\n");
 770         return;
 771     }
 772
 773     __asm__ __volatile__ (
 774                           "movq %%cr0, %%rbx; "
 775                           "orq  $0x00000020,%%rbx; "
 776                           "movq %%rbx, %%cr0;"
 777                           :
 778                           :
 779                           : "%rbx"
 780                           );
 781     //
 782     // Should check and return Error here....
 783
 784
 785     // Setup VMXON Region
 786     host_vmcs_ptrs[cpu_id] = allocate_vmcs();
 787
 788     PrintDebug("VMXON pointer: 0x%p\n", (void *)host_vmcs_ptrs[cpu_id]);
 789
 790     if (v3_enable_vmx(host_vmcs_ptrs[cpu_id]) == VMX_SUCCESS) {
 791         PrintDebug("VMX Enabled\n");
 792     } else {
 793         PrintError("VMX initialization failure\n");
 794         return;
 795     }
 796
 797
 798     if (has_vmx_nested_paging() == 1) {
 799         v3_cpu_types[cpu_id] = V3_VMX_EPT_CPU;
 800     } else {
 801         v3_cpu_types[cpu_id] = V3_VMX_CPU;
 802     }
 803
 804 }
 805