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) 2011, Jack Lange <jarusl@cs.northwestern.edu>
  11  * Copyright (c) 2011, The V3VEE Project <http://www.v3vee.org>
  12  * All rights reserved.
  13  *
  14  * Author: Jack Lange <jarusl@cs.northwestern.edu>
  15  *
  16  * This is free software.  You are permitted to use,
  17  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  18  */
  19
  20
  21 #include <palacios/vmx.h>
  22 #include <palacios/vmm.h>
  23 #include <palacios/vmx_handler.h>
  24 #include <palacios/vmcs.h>
  25 #include <palacios/vmx_lowlevel.h>
  26 #include <palacios/vmm_lowlevel.h>
  27 #include <palacios/vmm_ctrl_regs.h>
  28 #include <palacios/vmm_config.h>
  29 #include <palacios/vmm_time.h>
  30 #include <palacios/vm_guest_mem.h>
  31 #include <palacios/vmm_direct_paging.h>
  32 #include <palacios/vmx_io.h>
  33 #include <palacios/vmx_msr.h>
  34 #include <palacios/vmm_decoder.h>
  35 #include <palacios/vmm_barrier.h>
  36
  37 #ifdef V3_CONFIG_CHECKPOINT
  38 #include <palacios/vmm_checkpoint.h>
  39 #endif
  40
  41 #include <palacios/vmx_ept.h>
  42 #include <palacios/vmx_assist.h>
  43 #include <palacios/vmx_hw_info.h>
  44
  45 #ifndef V3_CONFIG_DEBUG_VMX
  46 #undef PrintDebug
  47 #define PrintDebug(fmt, args...)
  48 #endif
  49
  50
  51 /* These fields contain the hardware feature sets supported by the local CPU */
  52 static struct vmx_hw_info hw_info;
  53
  54 extern v3_cpu_arch_t v3_cpu_types[];
  55
  56 static addr_t host_vmcs_ptrs[V3_CONFIG_MAX_CPUS] = { [0 ... V3_CONFIG_MAX_CPUS - 1] = 0};
  57
  58 extern int v3_vmx_launch(struct v3_gprs * vm_regs, struct guest_info * info, struct v3_ctrl_regs * ctrl_regs);
  59 extern int v3_vmx_resume(struct v3_gprs * vm_regs, struct guest_info * info, struct v3_ctrl_regs * ctrl_regs);
  60
  61 static int inline check_vmcs_write(vmcs_field_t field, addr_t val) {
  62     int ret = 0;
  63
  64     ret = vmcs_write(field, val);
  65
  66     if (ret != VMX_SUCCESS) {
  67         PrintError("VMWRITE error on %s!: %d\n", v3_vmcs_field_to_str(field), ret);
  68         return 1;
  69     }
  70
  71     return 0;
  72 }
  73
  74 static int inline check_vmcs_read(vmcs_field_t field, void * val) {
  75     int ret = 0;
  76
  77     ret = vmcs_read(field, val);
  78
  79     if (ret != VMX_SUCCESS) {
  80         PrintError("VMREAD error on %s!: %d\n", v3_vmcs_field_to_str(field), ret);
  81     }
  82
  83     return ret;
  84 }
  85
  86
  87
  88
  89 static addr_t allocate_vmcs() {
  90     struct vmcs_data * vmcs_page = NULL;
  91
  92     PrintDebug("Allocating page\n");
  93
  94     vmcs_page = (struct vmcs_data *)V3_VAddr(V3_AllocPages(1));
  95     memset(vmcs_page, 0, 4096);
  96
  97     vmcs_page->revision = hw_info.basic_info.revision;
  98     PrintDebug("VMX Revision: 0x%x\n", vmcs_page->revision);
  99
 100     return (addr_t)V3_PAddr((void *)vmcs_page);
 101 }
 102
 103
 104
 105
 106 static int init_vmcs_bios(struct guest_info * core, struct vmx_data * vmx_state) {
 107     int vmx_ret = 0;
 108
 109     // disable global interrupts for vm state initialization
 110     v3_disable_ints();
 111
 112     PrintDebug("Loading VMCS\n");
 113     vmx_ret = vmcs_load(vmx_state->vmcs_ptr_phys);
 114     vmx_state->state = VMX_UNLAUNCHED;
 115
 116     if (vmx_ret != VMX_SUCCESS) {
 117         PrintError("VMPTRLD failed\n");
 118         return -1;
 119     }
 120
 121
 122     /*** Setup default state from HW ***/
 123
 124     vmx_state->pin_ctrls.value = hw_info.pin_ctrls.def_val;
 125     vmx_state->pri_proc_ctrls.value = hw_info.proc_ctrls.def_val;
 126     vmx_state->exit_ctrls.value = hw_info.exit_ctrls.def_val;
 127     vmx_state->entry_ctrls.value = hw_info.entry_ctrls.def_val;
 128     vmx_state->sec_proc_ctrls.value = hw_info.sec_proc_ctrls.def_val;
 129
 130     /* Print Control MSRs */
 131     PrintDebug("CR0 MSR: %p\n", (void *)(addr_t)hw_info.cr0.value);
 132     PrintDebug("CR4 MSR: %p\n", (void *)(addr_t)hw_info.cr4.value);
 133
 134
 135
 136     /******* Setup Host State **********/
 137
 138     /* Cache GDTR, IDTR, and TR in host struct */
 139     addr_t gdtr_base;
 140     struct {
 141         uint16_t selector;
 142         addr_t   base;
 143     } __attribute__((packed)) tmp_seg;
 144
 145
 146     __asm__ __volatile__(
 147                          "sgdt (%0);"
 148                          :
 149                          : "q"(&tmp_seg)
 150                          : "memory"
 151                          );
 152     gdtr_base = tmp_seg.base;
 153     vmx_state->host_state.gdtr.base = gdtr_base;
 154
 155     __asm__ __volatile__(
 156                          "sidt (%0);"
 157                          :
 158                          : "q"(&tmp_seg)
 159                          : "memory"
 160                          );
 161     vmx_state->host_state.idtr.base = tmp_seg.base;
 162
 163     __asm__ __volatile__(
 164                          "str (%0);"
 165                          :
 166                          : "q"(&tmp_seg)
 167                          : "memory"
 168                          );
 169     vmx_state->host_state.tr.selector = tmp_seg.selector;
 170
 171     /* The GDTR *index* is bits 3-15 of the selector. */
 172     struct tss_descriptor * desc = NULL;
 173     desc = (struct tss_descriptor *)(gdtr_base + (8 * (tmp_seg.selector >> 3)));
 174
 175     tmp_seg.base = ((desc->base1) |
 176                     (desc->base2 << 16) |
 177                     (desc->base3 << 24) |
 178 #ifdef __V3_64BIT__
 179                     ((uint64_t)desc->base4 << 32)
 180 #else
 181                     (0)
 182 #endif
 183                     );
 184
 185     vmx_state->host_state.tr.base = tmp_seg.base;
 186
 187
 188     /********** Setup VMX Control Fields ***********/
 189
 190     /* Add external interrupts, NMI exiting, and virtual NMI */
 191     vmx_state->pin_ctrls.nmi_exit = 1;
 192     vmx_state->pin_ctrls.ext_int_exit = 1;
 193
 194
 195     vmx_state->pri_proc_ctrls.hlt_exit = 1;
 196
 197
 198     vmx_state->pri_proc_ctrls.pause_exit = 0;
 199     vmx_state->pri_proc_ctrls.tsc_offset = 1;
 200 #ifdef V3_CONFIG_TIME_VIRTUALIZE_TSC
 201     vmx_state->pri_proc_ctrls.rdtsc_exit = 1;
 202 #endif
 203
 204     /* Setup IO map */
 205     vmx_state->pri_proc_ctrls.use_io_bitmap = 1;
 206     vmx_ret |= check_vmcs_write(VMCS_IO_BITMAP_A_ADDR, (addr_t)V3_PAddr(core->vm_info->io_map.arch_data));
 207     vmx_ret |= check_vmcs_write(VMCS_IO_BITMAP_B_ADDR,
 208             (addr_t)V3_PAddr(core->vm_info->io_map.arch_data) + PAGE_SIZE_4KB);
 209
 210
 211     vmx_state->pri_proc_ctrls.use_msr_bitmap = 1;
 212     vmx_ret |= check_vmcs_write(VMCS_MSR_BITMAP, (addr_t)V3_PAddr(core->vm_info->msr_map.arch_data));
 213
 214
 215
 216
 217
 218
 219
 220 #ifdef __V3_64BIT__
 221     // Ensure host runs in 64-bit mode at each VM EXIT
 222     vmx_state->exit_ctrls.host_64_on = 1;
 223 #endif
 224
 225     // Hook all accesses to EFER register
 226     v3_hook_msr(core->vm_info, EFER_MSR,
 227                 &v3_handle_efer_read,
 228                 &v3_handle_efer_write,
 229                 core);
 230
 231     // Restore host's EFER register on each VM EXIT
 232     vmx_state->exit_ctrls.ld_efer = 1;
 233
 234     // Save/restore guest's EFER register to/from VMCS on VM EXIT/ENTRY
 235     vmx_state->exit_ctrls.save_efer = 1;
 236     vmx_state->entry_ctrls.ld_efer  = 1;
 237
 238     // Cause VM_EXIT whenever CR4.VMXE or CR4.PAE bits are written
 239     vmx_ret |= check_vmcs_write(VMCS_CR4_MASK, CR4_VMXE | CR4_PAE);
 240
 241
 242     /* Setup paging */
 243     if (core->shdw_pg_mode == SHADOW_PAGING) {
 244         PrintDebug("Creating initial shadow page table\n");
 245
 246         if (v3_init_passthrough_pts(core) == -1) {
 247             PrintError("Could not initialize passthrough page tables\n");
 248             return -1;
 249         }
 250
 251 #define CR0_PE 0x00000001
 252 #define CR0_PG 0x80000000
 253 #define CR0_WP 0x00010000 // To ensure mem hooks work
 254         vmx_ret |= check_vmcs_write(VMCS_CR0_MASK, (CR0_PE | CR0_PG | CR0_WP));
 255
 256         core->ctrl_regs.cr3 = core->direct_map_pt;
 257
 258         // vmx_state->pinbased_ctrls |= NMI_EXIT;
 259
 260         /* Add CR exits */
 261         vmx_state->pri_proc_ctrls.cr3_ld_exit = 1;
 262         vmx_state->pri_proc_ctrls.cr3_str_exit = 1;
 263
 264         vmx_state->pri_proc_ctrls.invlpg_exit = 1;
 265
 266         /* Add page fault exits */
 267         vmx_state->excp_bmap.pf = 1;
 268
 269         // Setup VMX Assist
 270         v3_vmxassist_init(core, vmx_state);
 271
 272     } else if ((core->shdw_pg_mode == NESTED_PAGING) &&
 273                (v3_cpu_types[core->pcpu_id] == V3_VMX_EPT_CPU)) {
 274
 275 #define CR0_PE 0x00000001
 276 #define CR0_PG 0x80000000
 277 #define CR0_WP 0x00010000 // To ensure mem hooks work
 278         vmx_ret |= check_vmcs_write(VMCS_CR0_MASK, (CR0_PE | CR0_PG | CR0_WP));
 279
 280         // vmx_state->pinbased_ctrls |= NMI_EXIT;
 281
 282         /* Disable CR exits */
 283         vmx_state->pri_proc_ctrls.cr3_ld_exit = 0;
 284         vmx_state->pri_proc_ctrls.cr3_str_exit = 0;
 285
 286         vmx_state->pri_proc_ctrls.invlpg_exit = 0;
 287
 288         /* Add page fault exits */
 289         //      vmx_state->excp_bmap.pf = 1; // This should never happen..., enabled to catch bugs
 290
 291         // Setup VMX Assist
 292         v3_vmxassist_init(core, vmx_state);
 293
 294         /* Enable EPT */
 295         vmx_state->pri_proc_ctrls.sec_ctrls = 1; // Enable secondary proc controls
 296         vmx_state->sec_proc_ctrls.enable_ept = 1; // enable EPT paging
 297
 298
 299
 300         if (v3_init_ept(core, &hw_info) == -1) {
 301             PrintError("Error initializing EPT\n");
 302             return -1;
 303         }
 304
 305     } else if ((core->shdw_pg_mode == NESTED_PAGING) &&
 306                (v3_cpu_types[core->pcpu_id] == V3_VMX_EPT_UG_CPU)) {
 307         int i = 0;
 308         // For now we will assume that unrestricted guest mode is assured w/ EPT
 309
 310
 311         core->vm_regs.rsp = 0x00;
 312         core->rip = 0xfff0;
 313         core->vm_regs.rdx = 0x00000f00;
 314         core->ctrl_regs.rflags = 0x00000002; // The reserved bit is always 1
 315         core->ctrl_regs.cr0 = 0x60010010; // Set the WP flag so the memory hooks work in real-mode
 316
 317
 318         core->segments.cs.selector = 0xf000;
 319         core->segments.cs.limit = 0xffff;
 320         core->segments.cs.base = 0x0000000f0000LL;
 321
 322         // (raw attributes = 0xf3)
 323         core->segments.cs.type = 0xb;
 324         core->segments.cs.system = 0x1;
 325         core->segments.cs.dpl = 0x0;
 326         core->segments.cs.present = 1;
 327
 328
 329
 330         struct v3_segment * segregs [] = {&(core->segments.ss), &(core->segments.ds),
 331                                           &(core->segments.es), &(core->segments.fs),
 332                                           &(core->segments.gs), NULL};
 333
 334         for ( i = 0; segregs[i] != NULL; i++) {
 335             struct v3_segment * seg = segregs[i];
 336
 337             seg->selector = 0x0000;
 338             //    seg->base = seg->selector << 4;
 339             seg->base = 0x00000000;
 340             seg->limit = 0xffff;
 341
 342
 343             seg->type = 0x3;
 344             seg->system = 0x1;
 345             seg->dpl = 0x0;
 346             seg->present = 1;
 347             //    seg->granularity = 1;
 348
 349         }
 350
 351
 352         core->segments.gdtr.limit = 0x0000ffff;
 353         core->segments.gdtr.base = 0x0000000000000000LL;
 354
 355         core->segments.idtr.limit = 0x0000ffff;
 356         core->segments.idtr.base = 0x0000000000000000LL;
 357
 358         core->segments.ldtr.selector = 0x0000;
 359         core->segments.ldtr.limit = 0x0000ffff;
 360         core->segments.ldtr.base = 0x0000000000000000LL;
 361         core->segments.ldtr.type = 2;
 362         core->segments.ldtr.present = 1;
 363
 364         core->segments.tr.selector = 0x0000;
 365         core->segments.tr.limit = 0x0000ffff;
 366         core->segments.tr.base = 0x0000000000000000LL;
 367         core->segments.tr.type = 0xb;
 368         core->segments.tr.present = 1;
 369
 370         //      core->dbg_regs.dr6 = 0x00000000ffff0ff0LL;
 371         core->dbg_regs.dr7 = 0x0000000000000400LL;
 372
 373         /* Enable EPT */
 374         vmx_state->pri_proc_ctrls.sec_ctrls = 1; // Enable secondary proc controls
 375         vmx_state->sec_proc_ctrls.enable_ept = 1; // enable EPT paging
 376         vmx_state->sec_proc_ctrls.unrstrct_guest = 1; // enable unrestricted guest operation
 377
 378
 379         /* Disable shadow paging stuff */
 380         vmx_state->pri_proc_ctrls.cr3_ld_exit = 0;
 381         vmx_state->pri_proc_ctrls.cr3_str_exit = 0;
 382
 383         vmx_state->pri_proc_ctrls.invlpg_exit = 0;
 384
 385
 386         if (v3_init_ept(core, &hw_info) == -1) {
 387             PrintError("Error initializing EPT\n");
 388             return -1;
 389         }
 390
 391     } else {
 392         PrintError("Invalid Virtual paging mode\n");
 393         return -1;
 394     }
 395
 396
 397     // hook vmx msrs
 398
 399     // Setup SYSCALL/SYSENTER MSRs in load/store area
 400
 401     // save STAR, LSTAR, FMASK, KERNEL_GS_BASE MSRs in MSR load/store area
 402     {
 403 #define IA32_STAR 0xc0000081
 404 #define IA32_LSTAR 0xc0000082
 405 #define IA32_FMASK 0xc0000084
 406 #define IA32_KERN_GS_BASE 0xc0000102
 407
 408 #define IA32_CSTAR 0xc0000083 // Compatibility mode STAR (ignored for now... hopefully its not that important...)
 409
 410         int msr_ret = 0;
 411
 412         struct vmcs_msr_entry * exit_store_msrs = NULL;
 413         struct vmcs_msr_entry * exit_load_msrs = NULL;
 414         struct vmcs_msr_entry * entry_load_msrs = NULL;;
 415         int max_msrs = (hw_info.misc_info.max_msr_cache_size + 1) * 4;
 416
 417         V3_Print("Setting up MSR load/store areas (max_msr_count=%d)\n", max_msrs);
 418
 419         if (max_msrs < 4) {
 420             PrintError("Max MSR cache size is too small (%d)\n", max_msrs);
 421             return -1;
 422         }
 423
 424         vmx_state->msr_area = V3_VAddr(V3_AllocPages(1));
 425
 426         if (vmx_state->msr_area == NULL) {
 427             PrintError("could not allocate msr load/store area\n");
 428             return -1;
 429         }
 430
 431         msr_ret |= check_vmcs_write(VMCS_EXIT_MSR_STORE_CNT, 4);
 432         msr_ret |= check_vmcs_write(VMCS_EXIT_MSR_LOAD_CNT, 4);
 433         msr_ret |= check_vmcs_write(VMCS_ENTRY_MSR_LOAD_CNT, 4);
 434
 435
 436         exit_store_msrs = (struct vmcs_msr_entry *)(vmx_state->msr_area);
 437         exit_load_msrs = (struct vmcs_msr_entry *)(vmx_state->msr_area + (sizeof(struct vmcs_msr_entry) * 4));
 438         entry_load_msrs = (struct vmcs_msr_entry *)(vmx_state->msr_area + (sizeof(struct vmcs_msr_entry) * 8));
 439
 440
 441         exit_store_msrs[0].index = IA32_STAR;
 442         exit_store_msrs[1].index = IA32_LSTAR;
 443         exit_store_msrs[2].index = IA32_FMASK;
 444         exit_store_msrs[3].index = IA32_KERN_GS_BASE;
 445
 446         memcpy(exit_store_msrs, exit_load_msrs, sizeof(struct vmcs_msr_entry) * 4);
 447         memcpy(exit_store_msrs, entry_load_msrs, sizeof(struct vmcs_msr_entry) * 4);
 448
 449
 450         v3_get_msr(IA32_STAR, &(exit_load_msrs[0].hi), &(exit_load_msrs[0].lo));
 451         v3_get_msr(IA32_LSTAR, &(exit_load_msrs[1].hi), &(exit_load_msrs[1].lo));
 452         v3_get_msr(IA32_FMASK, &(exit_load_msrs[2].hi), &(exit_load_msrs[2].lo));
 453         v3_get_msr(IA32_KERN_GS_BASE, &(exit_load_msrs[3].hi), &(exit_load_msrs[3].lo));
 454
 455         msr_ret |= check_vmcs_write(VMCS_EXIT_MSR_STORE_ADDR, (addr_t)V3_PAddr(exit_store_msrs));
 456         msr_ret |= check_vmcs_write(VMCS_EXIT_MSR_LOAD_ADDR, (addr_t)V3_PAddr(exit_load_msrs));
 457         msr_ret |= check_vmcs_write(VMCS_ENTRY_MSR_LOAD_ADDR, (addr_t)V3_PAddr(entry_load_msrs));
 458
 459     }
 460
 461     /* Sanity check ctrl/reg fields against hw_defaults */
 462
 463
 464
 465
 466     /*** Write all the info to the VMCS ***/
 467
 468     /*
 469     {
 470         // IS THIS NECESSARY???
 471 #define DEBUGCTL_MSR 0x1d9
 472         struct v3_msr tmp_msr;
 473         v3_get_msr(DEBUGCTL_MSR, &(tmp_msr.hi), &(tmp_msr.lo));
 474         vmx_ret |= check_vmcs_write(VMCS_GUEST_DBG_CTL, tmp_msr.value);
 475         core->dbg_regs.dr7 = 0x400;
 476     }
 477     */
 478
 479 #ifdef __V3_64BIT__
 480     vmx_ret |= check_vmcs_write(VMCS_LINK_PTR, (addr_t)0xffffffffffffffffULL);
 481 #else
 482     vmx_ret |= check_vmcs_write(VMCS_LINK_PTR, (addr_t)0xffffffffUL);
 483     vmx_ret |= check_vmcs_write(VMCS_LINK_PTR_HIGH, (addr_t)0xffffffffUL);
 484 #endif
 485
 486
 487
 488
 489     if (v3_update_vmcs_ctrl_fields(core)) {
 490         PrintError("Could not write control fields!\n");
 491         return -1;
 492     }
 493
 494     if (v3_update_vmcs_host_state(core)) {
 495         PrintError("Could not write host state\n");
 496         return -1;
 497     }
 498
 499     // reenable global interrupts for vm state initialization now
 500     // that the vm state is initialized. If another VM kicks us off,
 501     // it'll update our vmx state so that we know to reload ourself
 502     v3_enable_ints();
 503
 504     return 0;
 505 }
 506
 507 int v3_init_vmx_vmcs(struct guest_info * core, v3_vm_class_t vm_class) {
 508     struct vmx_data * vmx_state = NULL;
 509     int vmx_ret = 0;
 510
 511     vmx_state = (struct vmx_data *)V3_Malloc(sizeof(struct vmx_data));
 512     memset(vmx_state, 0, sizeof(struct vmx_data));
 513
 514     PrintDebug("vmx_data pointer: %p\n", (void *)vmx_state);
 515
 516     PrintDebug("Allocating VMCS\n");
 517     vmx_state->vmcs_ptr_phys = allocate_vmcs();
 518
 519     PrintDebug("VMCS pointer: %p\n", (void *)(vmx_state->vmcs_ptr_phys));
 520
 521     core->vmm_data = vmx_state;
 522     vmx_state->state = VMX_UNLAUNCHED;
 523
 524     PrintDebug("Initializing VMCS (addr=%p)\n", core->vmm_data);
 525
 526     // TODO: Fix vmcs fields so they're 32-bit
 527
 528     PrintDebug("Clearing VMCS: %p\n", (void *)vmx_state->vmcs_ptr_phys);
 529     vmx_ret = vmcs_clear(vmx_state->vmcs_ptr_phys);
 530
 531     if (vmx_ret != VMX_SUCCESS) {
 532         PrintError("VMCLEAR failed\n");
 533         return -1;
 534     }
 535
 536     if (vm_class == V3_PC_VM) {
 537         PrintDebug("Initializing VMCS\n");
 538         if (init_vmcs_bios(core, vmx_state) == -1) {
 539             PrintError("Error initializing VMCS to BIOS state\n");
 540             return -1;
 541         }
 542     } else {
 543         PrintError("Invalid VM Class\n");
 544         return -1;
 545     }
 546
 547     PrintDebug("Serializing VMCS: %p\n", (void *)vmx_state->vmcs_ptr_phys);
 548     vmx_ret = vmcs_clear(vmx_state->vmcs_ptr_phys);
 549
 550     return 0;
 551 }
 552
 553
 554 int v3_deinit_vmx_vmcs(struct guest_info * core) {
 555     struct vmx_data * vmx_state = core->vmm_data;
 556
 557     V3_FreePages((void *)(vmx_state->vmcs_ptr_phys), 1);
 558     V3_FreePages(V3_PAddr(vmx_state->msr_area), 1);
 559
 560     V3_Free(vmx_state);
 561
 562     return 0;
 563 }
 564
 565
 566
 567 #ifdef V3_CONFIG_CHECKPOINT
 568 /*
 569  * JRL: This is broken
 570  */
 571 int v3_vmx_save_core(struct guest_info * core, void * ctx){
 572     uint64_t vmcs_ptr = vmcs_store();
 573
 574     v3_chkpt_save(ctx, "vmcs_data", PAGE_SIZE, (void *)vmcs_ptr);
 575
 576     return 0;
 577 }
 578
 579 int v3_vmx_load_core(struct guest_info * core, void * ctx){
 580     struct vmx_data * vmx_info = (struct vmx_data *)(core->vmm_data);
 581     struct cr0_32 * shadow_cr0;
 582     char vmcs[PAGE_SIZE_4KB];
 583
 584     v3_chkpt_load(ctx, "vmcs_data", PAGE_SIZE_4KB, vmcs);
 585
 586     vmcs_clear(vmx_info->vmcs_ptr_phys);
 587     vmcs_load((addr_t)vmcs);
 588
 589     v3_vmx_save_vmcs(core);
 590
 591     shadow_cr0 = (struct cr0_32 *)&(core->ctrl_regs.cr0);
 592
 593
 594     /* Get the CPU mode to set the guest_ia32e entry ctrl */
 595
 596     if (core->shdw_pg_mode == SHADOW_PAGING) {
 597         if (shadow_cr0->pg){
 598             if (v3_activate_passthrough_pt(core) == -1) {
 599                 PrintError("Failed to activate passthrough page tables\n");
 600                 return -1;
 601             }
 602         }
 603     }
 604
 605     return 0;
 606 }
 607 #endif
 608
 609
 610 static int update_irq_exit_state(struct guest_info * info) {
 611     struct vmx_exit_idt_vec_info idt_vec_info;
 612
 613     check_vmcs_read(VMCS_IDT_VECTOR_INFO, &(idt_vec_info.value));
 614
 615     if ((info->intr_core_state.irq_started == 1) && (idt_vec_info.valid == 0)) {
 616 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 617         V3_Print("Calling v3_injecting_intr\n");
 618 #endif
 619         info->intr_core_state.irq_started = 0;
 620         v3_injecting_intr(info, info->intr_core_state.irq_vector, V3_EXTERNAL_IRQ);
 621     }
 622
 623     return 0;
 624 }
 625
 626 static int update_irq_entry_state(struct guest_info * info) {
 627     struct vmx_exit_idt_vec_info idt_vec_info;
 628     struct vmcs_interrupt_state intr_core_state;
 629     struct vmx_data * vmx_info = (struct vmx_data *)(info->vmm_data);
 630
 631     check_vmcs_read(VMCS_IDT_VECTOR_INFO, &(idt_vec_info.value));
 632     check_vmcs_read(VMCS_GUEST_INT_STATE, &(intr_core_state));
 633
 634     /* Check for pending exceptions to inject */
 635     if (v3_excp_pending(info)) {
 636         struct vmx_entry_int_info int_info;
 637         int_info.value = 0;
 638
 639         // In VMX, almost every exception is hardware
 640         // Software exceptions are pretty much only for breakpoint or overflow
 641         int_info.type = 3;
 642         int_info.vector = v3_get_excp_number(info);
 643
 644         if (info->excp_state.excp_error_code_valid) {
 645             check_vmcs_write(VMCS_ENTRY_EXCP_ERR, info->excp_state.excp_error_code);
 646             int_info.error_code = 1;
 647
 648 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 649             V3_Print("Injecting exception %d with error code %x\n",
 650                     int_info.vector, info->excp_state.excp_error_code);
 651 #endif
 652         }
 653
 654         int_info.valid = 1;
 655 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 656         V3_Print("Injecting exception %d (EIP=%p)\n", int_info.vector, (void *)(addr_t)info->rip);
 657 #endif
 658         check_vmcs_write(VMCS_ENTRY_INT_INFO, int_info.value);
 659
 660         v3_injecting_excp(info, int_info.vector);
 661
 662     } else if ((((struct rflags *)&(info->ctrl_regs.rflags))->intr == 1) &&
 663                (intr_core_state.val == 0)) {
 664
 665         if ((info->intr_core_state.irq_started == 1) && (idt_vec_info.valid == 1)) {
 666
 667 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 668             V3_Print("IRQ pending from previous injection\n");
 669 #endif
 670
 671             // Copy the IDT vectoring info over to reinject the old interrupt
 672             if (idt_vec_info.error_code == 1) {
 673                 uint32_t err_code = 0;
 674
 675                 check_vmcs_read(VMCS_IDT_VECTOR_ERR, &err_code);
 676                 check_vmcs_write(VMCS_ENTRY_EXCP_ERR, err_code);
 677             }
 678
 679             idt_vec_info.undef = 0;
 680             check_vmcs_write(VMCS_ENTRY_INT_INFO, idt_vec_info.value);
 681
 682         } else {
 683             struct vmx_entry_int_info ent_int;
 684             ent_int.value = 0;
 685
 686             switch (v3_intr_pending(info)) {
 687                 case V3_EXTERNAL_IRQ: {
 688                     info->intr_core_state.irq_vector = v3_get_intr(info);
 689                     ent_int.vector = info->intr_core_state.irq_vector;
 690                     ent_int.type = 0;
 691                     ent_int.error_code = 0;
 692                     ent_int.valid = 1;
 693
 694 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 695                     V3_Print("Injecting Interrupt %d at exit %u(EIP=%p)\n",
 696                                info->intr_core_state.irq_vector,
 697                                (uint32_t)info->num_exits,
 698                                (void *)(addr_t)info->rip);
 699 #endif
 700
 701                     check_vmcs_write(VMCS_ENTRY_INT_INFO, ent_int.value);
 702                     info->intr_core_state.irq_started = 1;
 703
 704                     break;
 705                 }
 706                 case V3_NMI:
 707                     PrintDebug("Injecting NMI\n");
 708
 709                     ent_int.type = 2;
 710                     ent_int.vector = 2;
 711                     ent_int.valid = 1;
 712                     check_vmcs_write(VMCS_ENTRY_INT_INFO, ent_int.value);
 713
 714                     break;
 715                 case V3_SOFTWARE_INTR:
 716                     PrintDebug("Injecting software interrupt\n");
 717                     ent_int.type = 4;
 718
 719                     ent_int.valid = 1;
 720                     check_vmcs_write(VMCS_ENTRY_INT_INFO, ent_int.value);
 721
 722                     break;
 723                 case V3_VIRTUAL_IRQ:
 724                     // Not sure what to do here, Intel doesn't have virtual IRQs
 725                     // May be the same as external interrupts/IRQs
 726
 727                     break;
 728                 case V3_INVALID_INTR:
 729                 default:
 730                     break;
 731             }
 732         }
 733     } else if ((v3_intr_pending(info)) && (vmx_info->pri_proc_ctrls.int_wndw_exit == 0)) {
 734         // Enable INTR window exiting so we know when IF=1
 735         uint32_t instr_len;
 736
 737         check_vmcs_read(VMCS_EXIT_INSTR_LEN, &instr_len);
 738
 739 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 740         V3_Print("Enabling Interrupt-Window exiting: %d\n", instr_len);
 741 #endif
 742
 743         vmx_info->pri_proc_ctrls.int_wndw_exit = 1;
 744         check_vmcs_write(VMCS_PROC_CTRLS, vmx_info->pri_proc_ctrls.value);
 745     }
 746
 747
 748     return 0;
 749 }
 750
 751
 752
 753 static struct vmx_exit_info exit_log[10];
 754
 755 static void print_exit_log(struct guest_info * info) {
 756     int cnt = info->num_exits % 10;
 757     int i = 0;
 758
 759
 760     V3_Print("\nExit Log (%d total exits):\n", (uint32_t)info->num_exits);
 761
 762     for (i = 0; i < 10; i++) {
 763         struct vmx_exit_info * tmp = &exit_log[cnt];
 764
 765         V3_Print("%d:\texit_reason = %p\n", i, (void *)(addr_t)tmp->exit_reason);
 766         V3_Print("\texit_qual = %p\n", (void *)tmp->exit_qual);
 767         V3_Print("\tint_info = %p\n", (void *)(addr_t)tmp->int_info);
 768         V3_Print("\tint_err = %p\n", (void *)(addr_t)tmp->int_err);
 769         V3_Print("\tinstr_info = %p\n", (void *)(addr_t)tmp->instr_info);
 770
 771         cnt--;
 772
 773         if (cnt == -1) {
 774             cnt = 9;
 775         }
 776
 777     }
 778
 779 }
 780
 781 /*
 782  * CAUTION and DANGER!!!
 783  *
 784  * The VMCS CANNOT(!!) be accessed outside of the cli/sti calls inside this function
 785  * When exectuing a symbiotic call, the VMCS WILL be overwritten, so any dependencies
 786  * on its contents will cause things to break. The contents at the time of the exit WILL
 787  * change before the exit handler is executed.
 788  */
 789 int v3_vmx_enter(struct guest_info * info) {
 790     int ret = 0;
 791     uint32_t tsc_offset_low, tsc_offset_high;
 792     struct vmx_exit_info exit_info;
 793     struct vmx_data * vmx_info = (struct vmx_data *)(info->vmm_data);
 794
 795     // Conditionally yield the CPU if the timeslice has expired
 796     v3_yield_cond(info);
 797
 798     // Perform any additional yielding needed for time adjustment
 799     v3_adjust_time(info);
 800
 801     // disable global interrupts for vm state transition
 802     v3_disable_ints();
 803
 804     // Update timer devices late after being in the VM so that as much
 805     // of hte time in the VM is accounted for as possible. Also do it before
 806     // updating IRQ entry state so that any interrupts the timers raise get
 807     // handled on the next VM entry. Must be done with interrupts disabled.
 808     v3_update_timers(info);
 809
 810     if (vmcs_store() != vmx_info->vmcs_ptr_phys) {
 811         vmcs_clear(vmx_info->vmcs_ptr_phys);
 812         vmcs_load(vmx_info->vmcs_ptr_phys);
 813         vmx_info->state = VMX_UNLAUNCHED;
 814     }
 815
 816     v3_vmx_restore_vmcs(info);
 817
 818
 819 #ifdef V3_CONFIG_SYMCALL
 820     if (info->sym_core_state.symcall_state.sym_call_active == 0) {
 821         update_irq_entry_state(info);
 822     }
 823 #else
 824     update_irq_entry_state(info);
 825 #endif
 826
 827     {
 828         addr_t guest_cr3;
 829         vmcs_read(VMCS_GUEST_CR3, &guest_cr3);
 830         vmcs_write(VMCS_GUEST_CR3, guest_cr3);
 831     }
 832
 833     // Perform last-minute time bookkeeping prior to entering the VM
 834     v3_time_enter_vm(info);
 835
 836     tsc_offset_high = (uint32_t)((v3_tsc_host_offset(&info->time_state) >> 32) & 0xffffffff);
 837     tsc_offset_low = (uint32_t)(v3_tsc_host_offset(&info->time_state) & 0xffffffff);
 838     check_vmcs_write(VMCS_TSC_OFFSET_HIGH, tsc_offset_high);
 839     check_vmcs_write(VMCS_TSC_OFFSET, tsc_offset_low);
 840
 841
 842     if (v3_update_vmcs_host_state(info)) {
 843         v3_enable_ints();
 844         PrintError("Could not write host state\n");
 845         return -1;
 846     }
 847
 848
 849     if (vmx_info->state == VMX_UNLAUNCHED) {
 850         vmx_info->state = VMX_LAUNCHED;
 851
 852         info->vm_info->run_state = VM_RUNNING;
 853         ret = v3_vmx_launch(&(info->vm_regs), info, &(info->ctrl_regs));
 854     } else {
 855         V3_ASSERT(vmx_info->state != VMX_UNLAUNCHED);
 856         ret = v3_vmx_resume(&(info->vm_regs), info, &(info->ctrl_regs));
 857     }
 858
 859     //  PrintDebug("VMX Exit: ret=%d\n", ret);
 860
 861     if (ret != VMX_SUCCESS) {
 862         uint32_t error = 0;
 863
 864         vmcs_read(VMCS_INSTR_ERR, &error);
 865
 866         v3_enable_ints();
 867
 868         PrintError("VMENTRY Error: %d\n", error);
 869         return -1;
 870     }
 871
 872     // Immediate exit from VM time bookkeeping
 873     v3_time_exit_vm(info);
 874
 875     info->num_exits++;
 876
 877     /* Update guest state */
 878     v3_vmx_save_vmcs(info);
 879
 880     // info->cpl = info->segments.cs.selector & 0x3;
 881
 882     info->mem_mode = v3_get_vm_mem_mode(info);
 883     info->cpu_mode = v3_get_vm_cpu_mode(info);
 884
 885
 886     check_vmcs_read(VMCS_EXIT_INSTR_LEN, &(exit_info.instr_len));
 887     check_vmcs_read(VMCS_EXIT_INSTR_INFO, &(exit_info.instr_info));
 888     check_vmcs_read(VMCS_EXIT_REASON, &(exit_info.exit_reason));
 889     check_vmcs_read(VMCS_EXIT_QUAL, &(exit_info.exit_qual));
 890     check_vmcs_read(VMCS_EXIT_INT_INFO, &(exit_info.int_info));
 891     check_vmcs_read(VMCS_EXIT_INT_ERR, &(exit_info.int_err));
 892     check_vmcs_read(VMCS_GUEST_LINEAR_ADDR, &(exit_info.guest_linear_addr));
 893
 894     if (info->shdw_pg_mode == NESTED_PAGING) {
 895         check_vmcs_read(VMCS_GUEST_PHYS_ADDR, &(exit_info.ept_fault_addr));
 896     }
 897
 898     //PrintDebug("VMX Exit taken, id-qual: %u-%lu\n", exit_info.exit_reason, exit_info.exit_qual);
 899
 900     exit_log[info->num_exits % 10] = exit_info;
 901
 902 #ifdef V3_CONFIG_SYMCALL
 903     if (info->sym_core_state.symcall_state.sym_call_active == 0) {
 904         update_irq_exit_state(info);
 905     }
 906 #else
 907     update_irq_exit_state(info);
 908 #endif
 909
 910     if (exit_info.exit_reason == VMEXIT_INTR_WINDOW) {
 911         // This is a special case whose only job is to inject an interrupt
 912         vmcs_read(VMCS_PROC_CTRLS, &(vmx_info->pri_proc_ctrls.value));
 913         vmx_info->pri_proc_ctrls.int_wndw_exit = 0;
 914         vmcs_write(VMCS_PROC_CTRLS, vmx_info->pri_proc_ctrls.value);
 915
 916 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 917        V3_Print("Interrupts available again! (RIP=%llx)\n", info->rip);
 918 #endif
 919     }
 920
 921     // reenable global interrupts after vm exit
 922     v3_enable_ints();
 923
 924     // Conditionally yield the CPU if the timeslice has expired
 925     v3_yield_cond(info);
 926
 927     if (v3_handle_vmx_exit(info, &exit_info) == -1) {
 928         PrintError("Error in VMX exit handler (Exit reason=%x)\n", exit_info.exit_reason);
 929         return -1;
 930     }
 931
 932     return 0;
 933 }
 934
 935
 936 int v3_start_vmx_guest(struct guest_info * info) {
 937
 938     PrintDebug("Starting VMX core %u\n", info->vcpu_id);
 939
 940     if (info->vcpu_id == 0) {
 941         info->core_run_state = CORE_RUNNING;
 942         info->vm_info->run_state = VM_RUNNING;
 943     } else {
 944
 945         PrintDebug("VMX core %u: Waiting for core initialization\n", info->vcpu_id);
 946
 947         while (info->core_run_state == CORE_STOPPED) {
 948             v3_yield(info);
 949             //PrintDebug("VMX core %u: still waiting for INIT\n",info->vcpu_id);
 950         }
 951
 952         PrintDebug("VMX core %u initialized\n", info->vcpu_id);
 953     }
 954
 955
 956     PrintDebug("VMX core %u: I am starting at CS=0x%x (base=0x%p, limit=0x%x),  RIP=0x%p\n",
 957                info->vcpu_id, info->segments.cs.selector, (void *)(info->segments.cs.base),
 958                info->segments.cs.limit, (void *)(info->rip));
 959
 960
 961     PrintDebug("VMX core %u: Launching VMX VM on logical core %u\n", info->vcpu_id, info->pcpu_id);
 962
 963     v3_start_time(info);
 964
 965     while (1) {
 966
 967         if (info->vm_info->run_state == VM_STOPPED) {
 968             info->core_run_state = CORE_STOPPED;
 969             break;
 970         }
 971
 972         if (v3_vmx_enter(info) == -1) {
 973
 974             addr_t host_addr;
 975             addr_t linear_addr = 0;
 976
 977             info->vm_info->run_state = VM_ERROR;
 978
 979             V3_Print("VMX core %u: VMX ERROR!!\n", info->vcpu_id);
 980
 981             v3_print_guest_state(info);
 982
 983             V3_Print("VMX core %u\n", info->vcpu_id);
 984
 985             linear_addr = get_addr_linear(info, info->rip, &(info->segments.cs));
 986
 987             if (info->mem_mode == PHYSICAL_MEM) {
 988                 v3_gpa_to_hva(info, linear_addr, &host_addr);
 989             } else if (info->mem_mode == VIRTUAL_MEM) {
 990                 v3_gva_to_hva(info, linear_addr, &host_addr);
 991             }
 992
 993             V3_Print("VMX core %u: Host Address of rip = 0x%p\n", info->vcpu_id, (void *)host_addr);
 994
 995             V3_Print("VMX core %u: Instr (15 bytes) at %p:\n", info->vcpu_id, (void *)host_addr);
 996             v3_dump_mem((uint8_t *)host_addr, 15);
 997
 998             v3_print_stack(info);
 999
1000
1001             v3_print_vmcs();
1002             print_exit_log(info);
1003             return -1;
1004         }
1005
1006         v3_wait_at_barrier(info);
1007
1008
1009         if (info->vm_info->run_state == VM_STOPPED) {
1010             info->core_run_state = CORE_STOPPED;
1011             break;
1012         }
1013 /*
1014         if ((info->num_exits % 5000) == 0) {
1015             V3_Print("VMX Exit number %d\n", (uint32_t)info->num_exits);
1016         }
1017 */
1018
1019     }
1020
1021     return 0;
1022 }
1023
1024
1025
1026
1027 #define VMX_FEATURE_CONTROL_MSR     0x0000003a
1028 #define CPUID_VMX_FEATURES 0x00000005  /* LOCK and VMXON */
1029 #define CPUID_1_ECX_VTXFLAG 0x00000020
1030
1031 int v3_is_vmx_capable() {
1032     v3_msr_t feature_msr;
1033     uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0;
1034
1035     v3_cpuid(0x1, &eax, &ebx, &ecx, &edx);
1036
1037     PrintDebug("ECX: 0x%x\n", ecx);
1038
1039     if (ecx & CPUID_1_ECX_VTXFLAG) {
1040         v3_get_msr(VMX_FEATURE_CONTROL_MSR, &(feature_msr.hi), &(feature_msr.lo));
1041
1042         PrintDebug("MSRREGlow: 0x%.8x\n", feature_msr.lo);
1043
1044         if ((feature_msr.lo & CPUID_VMX_FEATURES) != CPUID_VMX_FEATURES) {
1045             PrintDebug("VMX is locked -- enable in the BIOS\n");
1046             return 0;
1047         }
1048
1049     } else {
1050         PrintDebug("VMX not supported on this cpu\n");
1051         return 0;
1052     }
1053
1054     return 1;
1055 }
1056
1057
1058 int v3_reset_vmx_vm_core(struct guest_info * core, addr_t rip) {
1059     // init vmcs bios
1060
1061     if ((core->shdw_pg_mode == NESTED_PAGING) &&
1062         (v3_cpu_types[core->pcpu_id] == V3_VMX_EPT_UG_CPU)) {
1063         // easy
1064         core->rip = 0;
1065         core->segments.cs.selector = rip << 8;
1066         core->segments.cs.limit = 0xffff;
1067         core->segments.cs.base = rip << 12;
1068     } else {
1069         core->vm_regs.rdx = core->vcpu_id;
1070         core->vm_regs.rbx = rip;
1071     }
1072
1073     return 0;
1074 }
1075
1076
1077
1078 void v3_init_vmx_cpu(int cpu_id) {
1079     addr_t vmx_on_region = 0;
1080
1081     if (cpu_id == 0) {
1082         if (v3_init_vmx_hw(&hw_info) == -1) {
1083             PrintError("Could not initialize VMX hardware features on cpu %d\n", cpu_id);
1084             return;
1085         }
1086     }
1087
1088     enable_vmx();
1089
1090
1091     // Setup VMXON Region
1092     vmx_on_region = allocate_vmcs();
1093
1094
1095     if (vmx_on(vmx_on_region) == VMX_SUCCESS) {
1096         V3_Print("VMX Enabled\n");
1097         host_vmcs_ptrs[cpu_id] = vmx_on_region;
1098     } else {
1099         V3_Print("VMX already enabled\n");
1100         V3_FreePages((void *)vmx_on_region, 1);
1101     }
1102
1103     PrintDebug("VMXON pointer: 0x%p\n", (void *)host_vmcs_ptrs[cpu_id]);
1104
1105     {
1106         struct vmx_sec_proc_ctrls sec_proc_ctrls;
1107         sec_proc_ctrls.value = v3_vmx_get_ctrl_features(&(hw_info.sec_proc_ctrls));
1108
1109         if (sec_proc_ctrls.enable_ept == 0) {
1110             V3_Print("VMX EPT (Nested) Paging not supported\n");
1111             v3_cpu_types[cpu_id] = V3_VMX_CPU;
1112         } else if (sec_proc_ctrls.unrstrct_guest == 0) {
1113             V3_Print("VMX EPT (Nested) Paging supported\n");
1114             v3_cpu_types[cpu_id] = V3_VMX_EPT_CPU;
1115         } else {
1116             V3_Print("VMX EPT (Nested) Paging + Unrestricted guest supported\n");
1117             v3_cpu_types[cpu_id] = V3_VMX_EPT_UG_CPU;
1118         }
1119     }
1120 }
1121
1122
1123 void v3_deinit_vmx_cpu(int cpu_id) {
1124     extern v3_cpu_arch_t v3_cpu_types[];
1125     v3_cpu_types[cpu_id] = V3_INVALID_CPU;
1126
1127     if (host_vmcs_ptrs[cpu_id] != 0) {
1128         V3_Print("Disabling VMX\n");
1129
1130         if (vmx_off() != VMX_SUCCESS) {
1131             PrintError("Error executing VMXOFF\n");
1132         }
1133
1134         V3_FreePages((void *)host_vmcs_ptrs[cpu_id], 1);
1135
1136         host_vmcs_ptrs[cpu_id] = 0;
1137     }
1138 }