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 #include <palacios/vmm_timeout.h>
  37 #include <palacios/vmm_debug.h>
  38
  39 #ifdef V3_CONFIG_CHECKPOINT
  40 #include <palacios/vmm_checkpoint.h>
  41 #endif
  42
  43 #include <palacios/vmx_ept.h>
  44 #include <palacios/vmx_assist.h>
  45 #include <palacios/vmx_hw_info.h>
  46
  47 #ifndef V3_CONFIG_DEBUG_VMX
  48 #undef PrintDebug
  49 #define PrintDebug(fmt, args...)
  50 #endif
  51
  52
  53 /* These fields contain the hardware feature sets supported by the local CPU */
  54 static struct vmx_hw_info hw_info;
  55
  56 extern v3_cpu_arch_t v3_mach_type;
  57
  58 static addr_t host_vmcs_ptrs[V3_CONFIG_MAX_CPUS] = { [0 ... V3_CONFIG_MAX_CPUS - 1] = 0};
  59
  60 extern int v3_vmx_launch(struct v3_gprs * vm_regs, struct guest_info * info, struct v3_ctrl_regs * ctrl_regs);
  61 extern int v3_vmx_resume(struct v3_gprs * vm_regs, struct guest_info * info, struct v3_ctrl_regs * ctrl_regs);
  62
  63 static int inline check_vmcs_write(vmcs_field_t field, addr_t val) {
  64     int ret = 0;
  65
  66     ret = vmcs_write(field, val);
  67
  68     if (ret != VMX_SUCCESS) {
  69         PrintError(VM_NONE, VCORE_NONE, "VMWRITE error on %s!: %d\n", v3_vmcs_field_to_str(field), ret);
  70         return 1;
  71     }
  72
  73
  74
  75
  76     return 0;
  77 }
  78
  79 static int inline check_vmcs_read(vmcs_field_t field, void * val) {
  80     int ret = 0;
  81
  82     ret = vmcs_read(field, val);
  83
  84     if (ret != VMX_SUCCESS) {
  85         PrintError(VM_NONE, VCORE_NONE, "VMREAD error on %s!: %d\n", v3_vmcs_field_to_str(field), ret);
  86     }
  87
  88     return ret;
  89 }
  90
  91
  92
  93
  94 static addr_t allocate_vmcs() {
  95     void *temp;
  96     struct vmcs_data * vmcs_page = NULL;
  97
  98     PrintDebug(VM_NONE, VCORE_NONE, "Allocating page\n");
  99
 100     temp = V3_AllocPages(1);
 101     if (!temp) {
 102         PrintError(VM_NONE, VCORE_NONE, "Cannot allocate VMCS\n");
 103         return -1;
 104     }
 105     vmcs_page = (struct vmcs_data *)V3_VAddr(temp);
 106     memset(vmcs_page, 0, 4096);
 107
 108     vmcs_page->revision = hw_info.basic_info.revision;
 109     PrintDebug(VM_NONE, VCORE_NONE, "VMX Revision: 0x%x\n", vmcs_page->revision);
 110
 111     return (addr_t)V3_PAddr((void *)vmcs_page);
 112 }
 113
 114
 115 #if 0
 116 static int debug_efer_read(struct guest_info * core, uint_t msr, struct v3_msr * src, void * priv_data) {
 117     struct v3_msr * efer = (struct v3_msr *)&(core->ctrl_regs.efer);
 118     V3_Print(core->vm_info, core, "\n\nEFER READ (val = %p)\n", (void *)efer->value);
 119
 120     v3_print_guest_state(core);
 121     v3_print_vmcs();
 122
 123
 124     src->value = efer->value;
 125     return 0;
 126 }
 127
 128 static int debug_efer_write(struct guest_info * core, uint_t msr, struct v3_msr src, void * priv_data) {
 129     struct v3_msr * efer = (struct v3_msr *)&(core->ctrl_regs.efer);
 130     V3_Print(core->vm_info, core, "\n\nEFER WRITE (old_val = %p) (new_val = %p)\n", (void *)efer->value, (void *)src.value);
 131
 132     v3_print_guest_state(core);
 133     v3_print_vmcs();
 134
 135     efer->value = src.value;
 136
 137     return 0;
 138 }
 139 #endif
 140
 141
 142 static int init_vmcs_bios(struct guest_info * core, struct vmx_data * vmx_state) {
 143     int vmx_ret = 0;
 144
 145     /* Get Available features */
 146     struct vmx_pin_ctrls avail_pin_ctrls;
 147     avail_pin_ctrls.value = v3_vmx_get_ctrl_features(&(hw_info.pin_ctrls));
 148     /* ** */
 149
 150
 151     // disable global interrupts for vm state initialization
 152     v3_disable_ints();
 153
 154     PrintDebug(core->vm_info, core, "Loading VMCS\n");
 155     vmx_ret = vmcs_load(vmx_state->vmcs_ptr_phys);
 156     vmx_state->state = VMX_UNLAUNCHED;
 157
 158     if (vmx_ret != VMX_SUCCESS) {
 159         PrintError(core->vm_info, core, "VMPTRLD failed\n");
 160         return -1;
 161     }
 162
 163
 164     /*** Setup default state from HW ***/
 165
 166     vmx_state->pin_ctrls.value = hw_info.pin_ctrls.def_val;
 167     vmx_state->pri_proc_ctrls.value = hw_info.proc_ctrls.def_val;
 168     vmx_state->exit_ctrls.value = hw_info.exit_ctrls.def_val;
 169     vmx_state->entry_ctrls.value = hw_info.entry_ctrls.def_val;
 170     vmx_state->sec_proc_ctrls.value = hw_info.sec_proc_ctrls.def_val;
 171
 172     /* Print Control MSRs */
 173     V3_Print(core->vm_info, core, "CR0 MSR: req_val=%p, req_mask=%p\n", (void *)(addr_t)hw_info.cr0.req_val, (void *)(addr_t)hw_info.cr0.req_mask);
 174     V3_Print(core->vm_info, core, "CR4 MSR: req_val=%p, req_mask=%p\n", (void *)(addr_t)hw_info.cr4.req_val, (void *)(addr_t)hw_info.cr4.req_mask);
 175
 176
 177
 178     /******* Setup Host State **********/
 179
 180     /* Cache GDTR, IDTR, and TR in host struct */
 181
 182
 183     /********** Setup VMX Control Fields ***********/
 184
 185     /* Add external interrupts, NMI exiting, and virtual NMI */
 186     vmx_state->pin_ctrls.nmi_exit = 1;
 187     vmx_state->pin_ctrls.virt_nmi = 1;
 188     vmx_state->pin_ctrls.ext_int_exit = 1;
 189
 190
 191
 192     /* We enable the preemption timer by default to measure accurate guest time */
 193     if (avail_pin_ctrls.active_preempt_timer) {
 194         V3_Print(core->vm_info, core, "VMX Preemption Timer is available\n");
 195         vmx_state->pin_ctrls.active_preempt_timer = 1;
 196         vmx_state->exit_ctrls.save_preempt_timer = 1;
 197     }
 198
 199     // we want it to use this when halting
 200     vmx_state->pri_proc_ctrls.hlt_exit = 1;
 201
 202     // cpuid tells it that it does not have these instructions
 203     vmx_state->pri_proc_ctrls.monitor_exit = 1;
 204     vmx_state->pri_proc_ctrls.mwait_exit = 1;
 205
 206     // we don't need to handle a pause, although this is where
 207     // we could pull out of a spin lock acquire or schedule to find its partner
 208     vmx_state->pri_proc_ctrls.pause_exit = 0;
 209
 210     vmx_state->pri_proc_ctrls.tsc_offset = 1;
 211 #ifdef V3_CONFIG_TIME_VIRTUALIZE_TSC
 212     vmx_state->pri_proc_ctrls.rdtsc_exit = 1;
 213 #endif
 214
 215     /* Setup IO map */
 216     vmx_state->pri_proc_ctrls.use_io_bitmap = 1;
 217     vmx_ret |= check_vmcs_write(VMCS_IO_BITMAP_A_ADDR, (addr_t)V3_PAddr(core->vm_info->io_map.arch_data));
 218     vmx_ret |= check_vmcs_write(VMCS_IO_BITMAP_B_ADDR,
 219             (addr_t)V3_PAddr(core->vm_info->io_map.arch_data) + PAGE_SIZE_4KB);
 220
 221
 222     vmx_state->pri_proc_ctrls.use_msr_bitmap = 1;
 223     vmx_ret |= check_vmcs_write(VMCS_MSR_BITMAP, (addr_t)V3_PAddr(core->vm_info->msr_map.arch_data));
 224
 225
 226
 227 #ifdef __V3_64BIT__
 228     // Ensure host runs in 64-bit mode at each VM EXIT
 229     vmx_state->exit_ctrls.host_64_on = 1;
 230 #endif
 231
 232
 233
 234     // Restore host's EFER register on each VM EXIT
 235     vmx_state->exit_ctrls.ld_efer = 1;
 236
 237     // Save/restore guest's EFER register to/from VMCS on VM EXIT/ENTRY
 238     vmx_state->exit_ctrls.save_efer = 1;
 239     vmx_state->entry_ctrls.ld_efer  = 1;
 240
 241     vmx_state->exit_ctrls.save_pat = 1;
 242     vmx_state->exit_ctrls.ld_pat = 1;
 243     vmx_state->entry_ctrls.ld_pat = 1;
 244
 245     /* Temporary GPF trap */
 246     //  vmx_state->excp_bmap.gp = 1;
 247
 248     // Setup Guests initial PAT field
 249     vmx_ret |= check_vmcs_write(VMCS_GUEST_PAT, 0x0007040600070406LL);
 250
 251     // Capture CR8 mods so that we can keep the apic_tpr correct
 252     vmx_state->pri_proc_ctrls.cr8_ld_exit = 1;
 253     vmx_state->pri_proc_ctrls.cr8_str_exit = 1;
 254
 255
 256     /* Setup paging */
 257     if (core->shdw_pg_mode == SHADOW_PAGING) {
 258         PrintDebug(core->vm_info, core, "Creating initial shadow page table\n");
 259
 260         if (v3_init_passthrough_pts(core) == -1) {
 261             PrintError(core->vm_info, core, "Could not initialize passthrough page tables\n");
 262             return -1;
 263         }
 264
 265 #define CR0_PE 0x00000001
 266 #define CR0_PG 0x80000000
 267 #define CR0_WP 0x00010000 // To ensure mem hooks work
 268 #define CR0_NE 0x00000020
 269         vmx_ret |= check_vmcs_write(VMCS_CR0_MASK, (CR0_PE | CR0_PG | CR0_WP | CR0_NE));
 270
 271
 272         // Cause VM_EXIT whenever CR4.VMXE or CR4.PAE bits are written
 273         vmx_ret |= check_vmcs_write(VMCS_CR4_MASK, CR4_VMXE | CR4_PAE);
 274
 275         core->ctrl_regs.cr3 = core->direct_map_pt;
 276
 277         // vmx_state->pinbased_ctrls |= NMI_EXIT;
 278
 279         /* Add CR exits */
 280         vmx_state->pri_proc_ctrls.cr3_ld_exit = 1;
 281         vmx_state->pri_proc_ctrls.cr3_str_exit = 1;
 282
 283         vmx_state->pri_proc_ctrls.invlpg_exit = 1;
 284
 285         /* Add page fault exits */
 286         vmx_state->excp_bmap.pf = 1;
 287
 288         // Setup VMX Assist
 289         v3_vmxassist_init(core, vmx_state);
 290
 291         // Hook all accesses to EFER register
 292         v3_hook_msr(core->vm_info, EFER_MSR,
 293                     &v3_handle_efer_read,
 294                     &v3_handle_efer_write,
 295                     core);
 296
 297     } else if ((core->shdw_pg_mode == NESTED_PAGING) &&
 298                (v3_mach_type == V3_VMX_EPT_CPU)) {
 299
 300 #define CR0_PE 0x00000001
 301 #define CR0_PG 0x80000000
 302 #define CR0_WP 0x00010000 // To ensure mem hooks work
 303 #define CR0_NE 0x00000020
 304         vmx_ret |= check_vmcs_write(VMCS_CR0_MASK, (CR0_PE | CR0_PG | CR0_WP | CR0_NE));
 305
 306         // vmx_state->pinbased_ctrls |= NMI_EXIT;
 307
 308         // Cause VM_EXIT whenever CR4.VMXE or CR4.PAE bits are written
 309         vmx_ret |= check_vmcs_write(VMCS_CR4_MASK, CR4_VMXE | CR4_PAE);
 310
 311         /* Disable CR exits */
 312         vmx_state->pri_proc_ctrls.cr3_ld_exit = 0;
 313         vmx_state->pri_proc_ctrls.cr3_str_exit = 0;
 314
 315         vmx_state->pri_proc_ctrls.invlpg_exit = 0;
 316
 317         /* Add page fault exits */
 318         //      vmx_state->excp_bmap.pf = 1; // This should never happen..., enabled to catch bugs
 319
 320         // Setup VMX Assist
 321         v3_vmxassist_init(core, vmx_state);
 322
 323         /* Enable EPT */
 324         vmx_state->pri_proc_ctrls.sec_ctrls = 1; // Enable secondary proc controls
 325         vmx_state->sec_proc_ctrls.enable_ept = 1; // enable EPT paging
 326
 327
 328
 329         if (v3_init_ept(core, &hw_info) == -1) {
 330             PrintError(core->vm_info, core, "Error initializing EPT\n");
 331             return -1;
 332         }
 333
 334         // Hook all accesses to EFER register
 335         v3_hook_msr(core->vm_info, EFER_MSR, NULL, NULL, NULL);
 336
 337     } else if ((core->shdw_pg_mode == NESTED_PAGING) &&
 338                (v3_mach_type == V3_VMX_EPT_UG_CPU)) {
 339         int i = 0;
 340         // For now we will assume that unrestricted guest mode is assured w/ EPT
 341
 342
 343         core->vm_regs.rsp = 0x00;
 344         core->rip = 0xfff0;
 345         core->vm_regs.rdx = 0x00000f00;
 346         core->ctrl_regs.rflags = 0x00000002; // The reserved bit is always 1
 347         core->ctrl_regs.cr0 = 0x60010030;
 348         core->ctrl_regs.cr4 = 0x00002010; // Enable VMX and PSE flag
 349
 350
 351         core->segments.cs.selector = 0xf000;
 352         core->segments.cs.limit = 0xffff;
 353         core->segments.cs.base = 0x0000000f0000LL;
 354
 355         // (raw attributes = 0xf3)
 356         core->segments.cs.type = 0xb;
 357         core->segments.cs.system = 0x1;
 358         core->segments.cs.dpl = 0x0;
 359         core->segments.cs.present = 1;
 360
 361
 362
 363         struct v3_segment * segregs [] = {&(core->segments.ss), &(core->segments.ds),
 364                                           &(core->segments.es), &(core->segments.fs),
 365                                           &(core->segments.gs), NULL};
 366
 367         for ( i = 0; segregs[i] != NULL; i++) {
 368             struct v3_segment * seg = segregs[i];
 369
 370             seg->selector = 0x0000;
 371             //    seg->base = seg->selector << 4;
 372             seg->base = 0x00000000;
 373             seg->limit = 0xffff;
 374
 375
 376             seg->type = 0x3;
 377             seg->system = 0x1;
 378             seg->dpl = 0x0;
 379             seg->present = 1;
 380             //    seg->granularity = 1;
 381
 382         }
 383
 384
 385         core->segments.gdtr.limit = 0x0000ffff;
 386         core->segments.gdtr.base = 0x0000000000000000LL;
 387
 388         core->segments.idtr.limit = 0x0000ffff;
 389         core->segments.idtr.base = 0x0000000000000000LL;
 390
 391         core->segments.ldtr.selector = 0x0000;
 392         core->segments.ldtr.limit = 0x0000ffff;
 393         core->segments.ldtr.base = 0x0000000000000000LL;
 394         core->segments.ldtr.type = 0x2;
 395         core->segments.ldtr.present = 1;
 396
 397         core->segments.tr.selector = 0x0000;
 398         core->segments.tr.limit = 0x0000ffff;
 399         core->segments.tr.base = 0x0000000000000000LL;
 400         core->segments.tr.type = 0xb;
 401         core->segments.tr.present = 1;
 402
 403         //      core->dbg_regs.dr6 = 0x00000000ffff0ff0LL;
 404         core->dbg_regs.dr7 = 0x0000000000000400LL;
 405
 406         /* Enable EPT */
 407         vmx_state->pri_proc_ctrls.sec_ctrls = 1; // Enable secondary proc controls
 408         vmx_state->sec_proc_ctrls.enable_ept = 1; // enable EPT paging
 409         vmx_state->sec_proc_ctrls.unrstrct_guest = 1; // enable unrestricted guest operation
 410
 411
 412         /* Disable shadow paging stuff */
 413         vmx_state->pri_proc_ctrls.cr3_ld_exit = 0;
 414         vmx_state->pri_proc_ctrls.cr3_str_exit = 0;
 415
 416         vmx_state->pri_proc_ctrls.invlpg_exit = 0;
 417
 418
 419         // Cause VM_EXIT whenever the CR4.VMXE bit is set
 420         vmx_ret |= check_vmcs_write(VMCS_CR4_MASK, CR4_VMXE);
 421 #define CR0_NE 0x00000020
 422 #define CR0_CD 0x40000000
 423         vmx_ret |= check_vmcs_write(VMCS_CR0_MASK, CR0_NE | CR0_CD);
 424         ((struct cr0_32 *)&(core->shdw_pg_state.guest_cr0))->ne = 1;
 425         ((struct cr0_32 *)&(core->shdw_pg_state.guest_cr0))->cd = 0;
 426
 427         if (v3_init_ept(core, &hw_info) == -1) {
 428             PrintError(core->vm_info, core, "Error initializing EPT\n");
 429             return -1;
 430         }
 431
 432         // Hook all accesses to EFER register
 433         //      v3_hook_msr(core->vm_info, EFER_MSR, &debug_efer_read, &debug_efer_write, core);
 434         v3_hook_msr(core->vm_info, EFER_MSR, NULL, NULL, NULL);
 435     } else {
 436         PrintError(core->vm_info, core, "Invalid Virtual paging mode (pg_mode=%d) (mach_type=%d)\n", core->shdw_pg_mode, v3_mach_type);
 437         return -1;
 438     }
 439
 440
 441     // hook vmx msrs
 442
 443     // Setup SYSCALL/SYSENTER MSRs in load/store area
 444
 445     // save STAR, LSTAR, FMASK, KERNEL_GS_BASE MSRs in MSR load/store area
 446     {
 447
 448         struct vmcs_msr_save_area * msr_entries = NULL;
 449         int max_msrs = (hw_info.misc_info.max_msr_cache_size + 1) * 4;
 450         int msr_ret = 0;
 451
 452         V3_Print(core->vm_info, core, "Setting up MSR load/store areas (max_msr_count=%d)\n", max_msrs);
 453
 454         if (max_msrs < 4) {
 455             PrintError(core->vm_info, core, "Max MSR cache size is too small (%d)\n", max_msrs);
 456             return -1;
 457         }
 458
 459         vmx_state->msr_area_paddr = (addr_t)V3_AllocPages(1);
 460
 461         if (vmx_state->msr_area_paddr == (addr_t)NULL) {
 462             PrintError(core->vm_info, core, "could not allocate msr load/store area\n");
 463             return -1;
 464         }
 465
 466         msr_entries = (struct vmcs_msr_save_area *)V3_VAddr((void *)(vmx_state->msr_area_paddr));
 467         vmx_state->msr_area = msr_entries; // cache in vmx_info
 468
 469         memset(msr_entries, 0, PAGE_SIZE);
 470
 471         msr_entries->guest_star.index = IA32_STAR_MSR;
 472         msr_entries->guest_lstar.index = IA32_LSTAR_MSR;
 473         msr_entries->guest_fmask.index = IA32_FMASK_MSR;
 474         msr_entries->guest_kern_gs.index = IA32_KERN_GS_BASE_MSR;
 475
 476         msr_entries->host_star.index = IA32_STAR_MSR;
 477         msr_entries->host_lstar.index = IA32_LSTAR_MSR;
 478         msr_entries->host_fmask.index = IA32_FMASK_MSR;
 479         msr_entries->host_kern_gs.index = IA32_KERN_GS_BASE_MSR;
 480
 481         msr_ret |= check_vmcs_write(VMCS_EXIT_MSR_STORE_CNT, 4);
 482         msr_ret |= check_vmcs_write(VMCS_EXIT_MSR_LOAD_CNT, 4);
 483         msr_ret |= check_vmcs_write(VMCS_ENTRY_MSR_LOAD_CNT, 4);
 484
 485         msr_ret |= check_vmcs_write(VMCS_EXIT_MSR_STORE_ADDR, (addr_t)V3_PAddr(msr_entries->guest_msrs));
 486         msr_ret |= check_vmcs_write(VMCS_ENTRY_MSR_LOAD_ADDR, (addr_t)V3_PAddr(msr_entries->guest_msrs));
 487         msr_ret |= check_vmcs_write(VMCS_EXIT_MSR_LOAD_ADDR, (addr_t)V3_PAddr(msr_entries->host_msrs));
 488
 489
 490         msr_ret |= v3_hook_msr(core->vm_info, IA32_STAR_MSR, NULL, NULL, NULL);
 491         msr_ret |= v3_hook_msr(core->vm_info, IA32_LSTAR_MSR, NULL, NULL, NULL);
 492         msr_ret |= v3_hook_msr(core->vm_info, IA32_FMASK_MSR, NULL, NULL, NULL);
 493         msr_ret |= v3_hook_msr(core->vm_info, IA32_KERN_GS_BASE_MSR, NULL, NULL, NULL);
 494
 495
 496         // IMPORTANT: These MSRs appear to be cached by the hardware....
 497         msr_ret |= v3_hook_msr(core->vm_info, SYSENTER_CS_MSR, NULL, NULL, NULL);
 498         msr_ret |= v3_hook_msr(core->vm_info, SYSENTER_ESP_MSR, NULL, NULL, NULL);
 499         msr_ret |= v3_hook_msr(core->vm_info, SYSENTER_EIP_MSR, NULL, NULL, NULL);
 500
 501         msr_ret |= v3_hook_msr(core->vm_info, FS_BASE_MSR, NULL, NULL, NULL);
 502         msr_ret |= v3_hook_msr(core->vm_info, GS_BASE_MSR, NULL, NULL, NULL);
 503
 504         msr_ret |= v3_hook_msr(core->vm_info, IA32_PAT_MSR, NULL, NULL, NULL);
 505
 506         // Not sure what to do about this... Does not appear to be an explicit hardware cache version...
 507         msr_ret |= v3_hook_msr(core->vm_info, IA32_CSTAR_MSR, NULL, NULL, NULL);
 508
 509         if (msr_ret != 0) {
 510             PrintError(core->vm_info, core, "Error configuring MSR save/restore area\n");
 511             return -1;
 512         }
 513
 514
 515     }
 516
 517     /* Sanity check ctrl/reg fields against hw_defaults */
 518
 519
 520
 521
 522     /*** Write all the info to the VMCS ***/
 523
 524     /*
 525     {
 526         // IS THIS NECESSARY???
 527 #define DEBUGCTL_MSR 0x1d9
 528         struct v3_msr tmp_msr;
 529         v3_get_msr(DEBUGCTL_MSR, &(tmp_msr.hi), &(tmp_msr.lo));
 530         vmx_ret |= check_vmcs_write(VMCS_GUEST_DBG_CTL, tmp_msr.value);
 531         core->dbg_regs.dr7 = 0x400;
 532     }
 533     */
 534
 535 #ifdef __V3_64BIT__
 536     vmx_ret |= check_vmcs_write(VMCS_LINK_PTR, (addr_t)0xffffffffffffffffULL);
 537 #else
 538     vmx_ret |= check_vmcs_write(VMCS_LINK_PTR, (addr_t)0xffffffffUL);
 539     vmx_ret |= check_vmcs_write(VMCS_LINK_PTR_HIGH, (addr_t)0xffffffffUL);
 540 #endif
 541
 542
 543
 544
 545
 546     if (v3_update_vmcs_ctrl_fields(core)) {
 547         PrintError(core->vm_info, core, "Could not write control fields!\n");
 548         return -1;
 549     }
 550
 551     /*
 552     if (v3_update_vmcs_host_state(core)) {
 553         PrintError(core->vm_info, core, "Could not write host state\n");
 554         return -1;
 555     }
 556     */
 557
 558     // reenable global interrupts for vm state initialization now
 559     // that the vm state is initialized. If another VM kicks us off,
 560     // it'll update our vmx state so that we know to reload ourself
 561     v3_enable_ints();
 562
 563     return 0;
 564 }
 565
 566
 567 static void __init_vmx_vmcs(void * arg) {
 568     struct guest_info * core = arg;
 569     struct vmx_data * vmx_state = NULL;
 570     int vmx_ret = 0;
 571
 572     vmx_state = (struct vmx_data *)V3_Malloc(sizeof(struct vmx_data));
 573
 574     if (!vmx_state) {
 575         PrintError(core->vm_info, core,  "Unable to allocate in initializing vmx vmcs\n");
 576         return;
 577     }
 578
 579     memset(vmx_state, 0, sizeof(struct vmx_data));
 580
 581     PrintDebug(core->vm_info, core,  "vmx_data pointer: %p\n", (void *)vmx_state);
 582
 583     PrintDebug(core->vm_info, core, "Allocating VMCS\n");
 584     vmx_state->vmcs_ptr_phys = allocate_vmcs();
 585
 586     PrintDebug(core->vm_info, core, "VMCS pointer: %p\n", (void *)(vmx_state->vmcs_ptr_phys));
 587
 588     core->vmm_data = vmx_state;
 589     vmx_state->state = VMX_UNLAUNCHED;
 590
 591     PrintDebug(core->vm_info, core, "Initializing VMCS (addr=%p)\n", core->vmm_data);
 592
 593     // TODO: Fix vmcs fields so they're 32-bit
 594
 595     PrintDebug(core->vm_info, core, "Clearing VMCS: %p\n", (void *)vmx_state->vmcs_ptr_phys);
 596     vmx_ret = vmcs_clear(vmx_state->vmcs_ptr_phys);
 597
 598     if (vmx_ret != VMX_SUCCESS) {
 599         PrintError(core->vm_info, core, "VMCLEAR failed\n");
 600         return;
 601     }
 602
 603     if (core->vm_info->vm_class == V3_PC_VM) {
 604         PrintDebug(core->vm_info, core, "Initializing VMCS\n");
 605         if (init_vmcs_bios(core, vmx_state) == -1) {
 606             PrintError(core->vm_info, core, "Error initializing VMCS to BIOS state\n");
 607             return;
 608         }
 609     } else {
 610         PrintError(core->vm_info, core, "Invalid VM Class\n");
 611         return;
 612     }
 613
 614     PrintDebug(core->vm_info, core, "Serializing VMCS: %p\n", (void *)vmx_state->vmcs_ptr_phys);
 615     vmx_ret = vmcs_clear(vmx_state->vmcs_ptr_phys);
 616
 617     core->core_run_state = CORE_STOPPED;
 618     return;
 619 }
 620
 621
 622
 623 int v3_init_vmx_vmcs(struct guest_info * core, v3_vm_class_t vm_class) {
 624     extern v3_cpu_arch_t v3_cpu_types[];
 625
 626     if (v3_cpu_types[V3_Get_CPU()] == V3_INVALID_CPU) {
 627         int i = 0;
 628
 629         for (i = 0; i < V3_CONFIG_MAX_CPUS; i++) {
 630             if (v3_cpu_types[i] != V3_INVALID_CPU) {
 631                 break;
 632             }
 633         }
 634
 635         if (i == V3_CONFIG_MAX_CPUS) {
 636             PrintError(core->vm_info, core, "Could not find VALID CPU for VMX guest initialization\n");
 637             return -1;
 638         }
 639
 640         V3_Call_On_CPU(i, __init_vmx_vmcs, core);
 641
 642     } else {
 643         __init_vmx_vmcs(core);
 644     }
 645
 646     if (core->core_run_state != CORE_STOPPED) {
 647         PrintError(core->vm_info, core, "Error initializing VMX Core\n");
 648         return -1;
 649     }
 650
 651     return 0;
 652 }
 653
 654
 655 int v3_deinit_vmx_vmcs(struct guest_info * core) {
 656     struct vmx_data * vmx_state = core->vmm_data;
 657
 658     V3_FreePages((void *)(vmx_state->vmcs_ptr_phys), 1);
 659     V3_FreePages(V3_PAddr(vmx_state->msr_area), 1);
 660
 661     V3_Free(vmx_state);
 662
 663     return 0;
 664 }
 665
 666
 667
 668 #ifdef V3_CONFIG_CHECKPOINT
 669 /*
 670  * JRL: This is broken
 671  */
 672 int v3_vmx_save_core(struct guest_info * core, void * ctx){
 673   struct vmx_data * vmx_info = (struct vmx_data *)(core->vmm_data);
 674
 675   // note that the vmcs pointer is an HPA, but we need an HVA
 676   if (v3_chkpt_save(ctx, "vmcs_data", PAGE_SIZE_4KB,
 677                     V3_VAddr((void*) (vmx_info->vmcs_ptr_phys)))) {
 678     PrintError(core->vm_info, core, "Could not save vmcs data for VMX\n");
 679     return -1;
 680   }
 681
 682   return 0;
 683 }
 684
 685 int v3_vmx_load_core(struct guest_info * core, void * ctx){
 686   struct vmx_data * vmx_info = (struct vmx_data *)(core->vmm_data);
 687   struct cr0_32 * shadow_cr0;
 688   addr_t vmcs_page_paddr;  //HPA
 689
 690   vmcs_page_paddr = (addr_t) V3_AllocPages(1);
 691
 692   if (!vmcs_page_paddr) {
 693     PrintError(core->vm_info, core, "Could not allocate space for a vmcs in VMX\n");
 694     return -1;
 695   }
 696
 697   if (v3_chkpt_load(ctx, "vmcs_data", PAGE_SIZE_4KB,
 698                     V3_VAddr((void *)vmcs_page_paddr)) == -1) {
 699     PrintError(core->vm_info, core, "Could not load vmcs data for VMX\n");
 700     V3_FreePages((void*)vmcs_page_paddr,1);
 701     return -1;
 702   }
 703
 704   vmcs_clear(vmx_info->vmcs_ptr_phys);
 705
 706   // Probably need to delete the old one...
 707   V3_FreePages((void*)(vmx_info->vmcs_ptr_phys),1);
 708
 709   vmcs_load(vmcs_page_paddr);
 710
 711   v3_vmx_save_vmcs(core);
 712
 713   shadow_cr0 = (struct cr0_32 *)&(core->ctrl_regs.cr0);
 714
 715
 716   /* Get the CPU mode to set the guest_ia32e entry ctrl */
 717
 718   if (core->shdw_pg_mode == SHADOW_PAGING) {
 719     if (v3_get_vm_mem_mode(core) == VIRTUAL_MEM) {
 720       if (v3_activate_shadow_pt(core) == -1) {
 721         PrintError(core->vm_info, core, "Failed to activate shadow page tables\n");
 722         return -1;
 723       }
 724     } else {
 725       if (v3_activate_passthrough_pt(core) == -1) {
 726         PrintError(core->vm_info, core, "Failed to activate passthrough page tables\n");
 727         return -1;
 728       }
 729     }
 730   }
 731
 732   return 0;
 733 }
 734 #endif
 735
 736
 737 void v3_flush_vmx_vm_core(struct guest_info * core) {
 738     struct vmx_data * vmx_info = (struct vmx_data *)(core->vmm_data);
 739     vmcs_clear(vmx_info->vmcs_ptr_phys);
 740     vmx_info->state = VMX_UNLAUNCHED;
 741 }
 742
 743
 744
 745 static int update_irq_exit_state(struct guest_info * info) {
 746     struct vmx_exit_idt_vec_info idt_vec_info;
 747
 748     check_vmcs_read(VMCS_IDT_VECTOR_INFO, &(idt_vec_info.value));
 749
 750     if ((info->intr_core_state.irq_started == 1) && (idt_vec_info.valid == 0)) {
 751 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 752         V3_Print(info->vm_info, info, "Calling v3_injecting_intr\n");
 753 #endif
 754         info->intr_core_state.irq_started = 0;
 755         v3_injecting_intr(info, info->intr_core_state.irq_vector, V3_EXTERNAL_IRQ);
 756     }
 757
 758     return 0;
 759 }
 760
 761 static int update_irq_entry_state(struct guest_info * info) {
 762     struct vmx_exit_idt_vec_info idt_vec_info;
 763     struct vmcs_interrupt_state intr_core_state;
 764     struct vmx_data * vmx_info = (struct vmx_data *)(info->vmm_data);
 765
 766     check_vmcs_read(VMCS_IDT_VECTOR_INFO, &(idt_vec_info.value));
 767     check_vmcs_read(VMCS_GUEST_INT_STATE, &(intr_core_state));
 768
 769     /* Check for pending exceptions to inject */
 770     if (v3_excp_pending(info)) {
 771         struct vmx_entry_int_info int_info;
 772         int_info.value = 0;
 773
 774         // In VMX, almost every exception is hardware
 775         // Software exceptions are pretty much only for breakpoint or overflow
 776         int_info.type = 3;
 777         int_info.vector = v3_get_excp_number(info);
 778
 779         if (info->excp_state.excp_error_code_valid) {
 780             check_vmcs_write(VMCS_ENTRY_EXCP_ERR, info->excp_state.excp_error_code);
 781             int_info.error_code = 1;
 782
 783 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 784             V3_Print(info->vm_info, info, "Injecting exception %d with error code %x\n",
 785                     int_info.vector, info->excp_state.excp_error_code);
 786 #endif
 787         }
 788
 789         int_info.valid = 1;
 790 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 791         V3_Print(info->vm_info, info, "Injecting exception %d (EIP=%p)\n", int_info.vector, (void *)(addr_t)info->rip);
 792 #endif
 793         check_vmcs_write(VMCS_ENTRY_INT_INFO, int_info.value);
 794
 795         v3_injecting_excp(info, int_info.vector);
 796
 797     } else if ((((struct rflags *)&(info->ctrl_regs.rflags))->intr == 1) &&
 798                (intr_core_state.val == 0)) {
 799
 800         if ((info->intr_core_state.irq_started == 1) && (idt_vec_info.valid == 1)) {
 801
 802 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 803             V3_Print(info->vm_info, info, "IRQ pending from previous injection\n");
 804 #endif
 805
 806             // Copy the IDT vectoring info over to reinject the old interrupt
 807             if (idt_vec_info.error_code == 1) {
 808                 uint32_t err_code = 0;
 809
 810                 check_vmcs_read(VMCS_IDT_VECTOR_ERR, &err_code);
 811                 check_vmcs_write(VMCS_ENTRY_EXCP_ERR, err_code);
 812             }
 813
 814             idt_vec_info.undef = 0;
 815             check_vmcs_write(VMCS_ENTRY_INT_INFO, idt_vec_info.value);
 816
 817         } else {
 818             struct vmx_entry_int_info ent_int;
 819             ent_int.value = 0;
 820
 821             switch (v3_intr_pending(info)) {
 822                 case V3_EXTERNAL_IRQ: {
 823                     info->intr_core_state.irq_vector = v3_get_intr(info);
 824                     ent_int.vector = info->intr_core_state.irq_vector;
 825                     ent_int.type = 0;
 826                     ent_int.error_code = 0;
 827                     ent_int.valid = 1;
 828
 829 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 830                     V3_Print(info->vm_info, info, "Injecting Interrupt %d at exit %u(EIP=%p)\n",
 831                                info->intr_core_state.irq_vector,
 832                                (uint32_t)info->num_exits,
 833                                (void *)(addr_t)info->rip);
 834 #endif
 835
 836                     check_vmcs_write(VMCS_ENTRY_INT_INFO, ent_int.value);
 837                     info->intr_core_state.irq_started = 1;
 838
 839                     break;
 840                 }
 841                 case V3_NMI:
 842                     PrintDebug(info->vm_info, info, "Injecting NMI\n");
 843
 844                     ent_int.type = 2;
 845                     ent_int.vector = 2;
 846                     ent_int.valid = 1;
 847                     check_vmcs_write(VMCS_ENTRY_INT_INFO, ent_int.value);
 848
 849                     break;
 850                 case V3_SOFTWARE_INTR:
 851                     PrintDebug(info->vm_info, info, "Injecting software interrupt\n");
 852                     ent_int.type = 4;
 853
 854                     ent_int.valid = 1;
 855                     check_vmcs_write(VMCS_ENTRY_INT_INFO, ent_int.value);
 856
 857                     break;
 858                 case V3_VIRTUAL_IRQ:
 859                     // Not sure what to do here, Intel doesn't have virtual IRQs
 860                     // May be the same as external interrupts/IRQs
 861
 862                     break;
 863                 case V3_INVALID_INTR:
 864                 default:
 865                     break;
 866             }
 867         }
 868     } else if ((v3_intr_pending(info)) && (vmx_info->pri_proc_ctrls.int_wndw_exit == 0)) {
 869         // Enable INTR window exiting so we know when IF=1
 870         uint32_t instr_len;
 871
 872         check_vmcs_read(VMCS_EXIT_INSTR_LEN, &instr_len);
 873
 874 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
 875         V3_Print(info->vm_info, info, "Enabling Interrupt-Window exiting: %d\n", instr_len);
 876 #endif
 877
 878         vmx_info->pri_proc_ctrls.int_wndw_exit = 1;
 879         check_vmcs_write(VMCS_PROC_CTRLS, vmx_info->pri_proc_ctrls.value);
 880     }
 881
 882
 883     return 0;
 884 }
 885
 886
 887
 888 static struct vmx_exit_info exit_log[10];
 889 static uint64_t rip_log[10];
 890
 891
 892
 893 static void print_exit_log(struct guest_info * info) {
 894     int cnt = info->num_exits % 10;
 895     int i = 0;
 896
 897
 898     V3_Print(info->vm_info, info, "\nExit Log (%d total exits):\n", (uint32_t)info->num_exits);
 899
 900     for (i = 0; i < 10; i++) {
 901         struct vmx_exit_info * tmp = &exit_log[cnt];
 902
 903         V3_Print(info->vm_info, info, "%d:\texit_reason = %p\n", i, (void *)(addr_t)tmp->exit_reason);
 904         V3_Print(info->vm_info, info, "\texit_qual = %p\n", (void *)tmp->exit_qual);
 905         V3_Print(info->vm_info, info, "\tint_info = %p\n", (void *)(addr_t)tmp->int_info);
 906         V3_Print(info->vm_info, info, "\tint_err = %p\n", (void *)(addr_t)tmp->int_err);
 907         V3_Print(info->vm_info, info, "\tinstr_info = %p\n", (void *)(addr_t)tmp->instr_info);
 908         V3_Print(info->vm_info, info, "\tguest_linear_addr= %p\n", (void *)(addr_t)tmp->guest_linear_addr);
 909         V3_Print(info->vm_info, info, "\tRIP = %p\n", (void *)rip_log[cnt]);
 910
 911
 912         cnt--;
 913
 914         if (cnt == -1) {
 915             cnt = 9;
 916         }
 917
 918     }
 919
 920 }
 921
 922 int
 923 v3_vmx_config_tsc_virtualization(struct guest_info * info) {
 924     struct vmx_data * vmx_info = (struct vmx_data *)(info->vmm_data);
 925
 926     if (info->time_state.flags & VM_TIME_TRAP_RDTSC) {
 927         if  (!vmx_info->pri_proc_ctrls.rdtsc_exit) {
 928             vmx_info->pri_proc_ctrls.rdtsc_exit = 1;
 929             check_vmcs_write(VMCS_PROC_CTRLS, vmx_info->pri_proc_ctrls.value);
 930         }
 931     } else {
 932         sint64_t tsc_offset;
 933         uint32_t tsc_offset_low, tsc_offset_high;
 934
 935         if  (vmx_info->pri_proc_ctrls.rdtsc_exit) {
 936             vmx_info->pri_proc_ctrls.rdtsc_exit = 0;
 937             check_vmcs_write(VMCS_PROC_CTRLS, vmx_info->pri_proc_ctrls.value);
 938         }
 939
 940         if (info->time_state.flags & VM_TIME_TSC_PASSTHROUGH) {
 941             tsc_offset = 0;
 942         } else {
 943             tsc_offset = v3_tsc_host_offset(&info->time_state);
 944         }
 945         tsc_offset_high = (uint32_t)(( tsc_offset >> 32) & 0xffffffff);
 946         tsc_offset_low = (uint32_t)(tsc_offset & 0xffffffff);
 947
 948         check_vmcs_write(VMCS_TSC_OFFSET_HIGH, tsc_offset_high);
 949         check_vmcs_write(VMCS_TSC_OFFSET, tsc_offset_low);
 950     }
 951     return 0;
 952 }
 953
 954 /*
 955  * CAUTION and DANGER!!!
 956  *
 957  * The VMCS CANNOT(!!) be accessed outside of the cli/sti calls inside this function
 958  * When exectuing a symbiotic call, the VMCS WILL be overwritten, so any dependencies
 959  * on its contents will cause things to break. The contents at the time of the exit WILL
 960  * change before the exit handler is executed.
 961  */
 962 int v3_vmx_enter(struct guest_info * info) {
 963     int ret = 0;
 964     struct vmx_exit_info exit_info;
 965     struct vmx_data * vmx_info = (struct vmx_data *)(info->vmm_data);
 966     uint64_t guest_cycles = 0;
 967
 968     // Conditionally yield the CPU if the timeslice has expired
 969     v3_schedule(info);
 970
 971     // Update timer devices late after being in the VM so that as much
 972     // of the time in the VM is accounted for as possible. Also do it before
 973     // updating IRQ entry state so that any interrupts the timers raise get
 974     // handled on the next VM entry.
 975     v3_advance_time(info, NULL);
 976     v3_update_timers(info);
 977
 978     // disable global interrupts for vm state transition
 979     v3_disable_ints();
 980
 981     if (vmcs_store() != vmx_info->vmcs_ptr_phys) {
 982         vmcs_clear(vmx_info->vmcs_ptr_phys);
 983         vmcs_load(vmx_info->vmcs_ptr_phys);
 984         vmx_info->state = VMX_UNLAUNCHED;
 985     }
 986
 987     v3_vmx_restore_vmcs(info);
 988
 989
 990 #ifdef V3_CONFIG_SYMCALL
 991     if (info->sym_core_state.symcall_state.sym_call_active == 0) {
 992         update_irq_entry_state(info);
 993     }
 994 #else
 995     update_irq_entry_state(info);
 996 #endif
 997
 998     {
 999         addr_t guest_cr3;
1000         vmcs_read(VMCS_GUEST_CR3, &guest_cr3);
1001         vmcs_write(VMCS_GUEST_CR3, guest_cr3);
1002     }
1003
1004
1005     // Perform last-minute time setup prior to entering the VM
1006     v3_vmx_config_tsc_virtualization(info);
1007
1008     if (v3_update_vmcs_host_state(info)) {
1009         v3_enable_ints();
1010         PrintError(info->vm_info, info, "Could not write host state\n");
1011         return -1;
1012     }
1013
1014     if (vmx_info->pin_ctrls.active_preempt_timer) {
1015         /* Preemption timer is active */
1016         uint32_t preempt_window = 0xffffffff;
1017
1018         if (info->timeouts.timeout_active) {
1019             preempt_window = info->timeouts.next_timeout;
1020         }
1021
1022         check_vmcs_write(VMCS_PREEMPT_TIMER, preempt_window);
1023     }
1024
1025
1026     {
1027         uint64_t entry_tsc = 0;
1028         uint64_t exit_tsc = 0;
1029
1030 #ifdef V3_CONFIG_PMU_TELEMETRY
1031         v3_pmu_telemetry_enter(info);
1032 #endif
1033
1034         if (vmx_info->state == VMX_UNLAUNCHED) {
1035             vmx_info->state = VMX_LAUNCHED;
1036             rdtscll(entry_tsc);
1037             ret = v3_vmx_launch(&(info->vm_regs), info, &(info->ctrl_regs));
1038             rdtscll(exit_tsc);
1039
1040         } else {
1041             V3_ASSERT(info->vm_info, info,vmx_info->state != VMX_UNLAUNCHED);
1042             rdtscll(entry_tsc);
1043             ret = v3_vmx_resume(&(info->vm_regs), info, &(info->ctrl_regs));
1044             rdtscll(exit_tsc);
1045         }
1046
1047         guest_cycles = exit_tsc - entry_tsc;
1048
1049 #ifdef V3_CONFIG_PMU_TELEMETRY
1050         v3_pmu_telemetry_exit(info);
1051 #endif
1052     }
1053
1054     //  PrintDebug(info->vm_info, info, "VMX Exit: ret=%d\n", ret);
1055
1056     if (ret != VMX_SUCCESS) {
1057         uint32_t error = 0;
1058         vmcs_read(VMCS_INSTR_ERR, &error);
1059
1060         v3_enable_ints();
1061
1062         PrintError(info->vm_info, info, "VMENTRY Error: %d (launch_ret = %d)\n", error, ret);
1063         return -1;
1064     }
1065
1066
1067     info->num_exits++;
1068
1069     /* If we have the preemption time, then use it to get more accurate guest time */
1070     if (vmx_info->pin_ctrls.active_preempt_timer) {
1071         uint32_t cycles_left = 0;
1072         check_vmcs_read(VMCS_PREEMPT_TIMER, &(cycles_left));
1073
1074         if (info->timeouts.timeout_active) {
1075             guest_cycles = info->timeouts.next_timeout - cycles_left;
1076         } else {
1077             guest_cycles = 0xffffffff - cycles_left;
1078         }
1079     }
1080
1081     // Immediate exit from VM time bookkeeping
1082     v3_advance_time(info, &guest_cycles);
1083
1084     /* Update guest state */
1085     v3_vmx_save_vmcs(info);
1086
1087     // info->cpl = info->segments.cs.selector & 0x3;
1088
1089     info->mem_mode = v3_get_vm_mem_mode(info);
1090     info->cpu_mode = v3_get_vm_cpu_mode(info);
1091
1092
1093
1094     check_vmcs_read(VMCS_EXIT_INSTR_LEN, &(exit_info.instr_len));
1095     check_vmcs_read(VMCS_EXIT_INSTR_INFO, &(exit_info.instr_info));
1096     check_vmcs_read(VMCS_EXIT_REASON, &(exit_info.exit_reason));
1097     check_vmcs_read(VMCS_EXIT_QUAL, &(exit_info.exit_qual));
1098     check_vmcs_read(VMCS_EXIT_INT_INFO, &(exit_info.int_info));
1099     check_vmcs_read(VMCS_EXIT_INT_ERR, &(exit_info.int_err));
1100     check_vmcs_read(VMCS_GUEST_LINEAR_ADDR, &(exit_info.guest_linear_addr));
1101
1102     if (info->shdw_pg_mode == NESTED_PAGING) {
1103         check_vmcs_read(VMCS_GUEST_PHYS_ADDR, &(exit_info.ept_fault_addr));
1104     }
1105
1106     //PrintDebug(info->vm_info, info, "VMX Exit taken, id-qual: %u-%lu\n", exit_info.exit_reason, exit_info.exit_qual);
1107
1108     exit_log[info->num_exits % 10] = exit_info;
1109     rip_log[info->num_exits % 10] = get_addr_linear(info, info->rip, &(info->segments.cs));
1110
1111 #ifdef V3_CONFIG_SYMCALL
1112     if (info->sym_core_state.symcall_state.sym_call_active == 0) {
1113         update_irq_exit_state(info);
1114     }
1115 #else
1116     update_irq_exit_state(info);
1117 #endif
1118
1119     if (exit_info.exit_reason == VMX_EXIT_INTR_WINDOW) {
1120         // This is a special case whose only job is to inject an interrupt
1121         vmcs_read(VMCS_PROC_CTRLS, &(vmx_info->pri_proc_ctrls.value));
1122         vmx_info->pri_proc_ctrls.int_wndw_exit = 0;
1123         vmcs_write(VMCS_PROC_CTRLS, vmx_info->pri_proc_ctrls.value);
1124
1125 #ifdef V3_CONFIG_DEBUG_INTERRUPTS
1126        V3_Print(info->vm_info, info, "Interrupts available again! (RIP=%llx)\n", info->rip);
1127 #endif
1128     }
1129
1130
1131     // Lastly we check for an NMI exit, and reinject if so
1132     {
1133         struct vmx_basic_exit_info * basic_info = (struct vmx_basic_exit_info *)&(exit_info.exit_reason);
1134
1135         if (basic_info->reason == VMX_EXIT_INFO_EXCEPTION_OR_NMI) {
1136             if ((uint8_t)exit_info.int_info == 2) {
1137                 asm("int $2");
1138             }
1139         }
1140     }
1141
1142     // reenable global interrupts after vm exit
1143     v3_enable_ints();
1144
1145     // Conditionally yield the CPU if the timeslice has expired
1146     v3_schedule(info);
1147     v3_advance_time(info, NULL);
1148     v3_update_timers(info);
1149
1150     if (v3_handle_vmx_exit(info, &exit_info) == -1) {
1151         PrintError(info->vm_info, info, "Error in VMX exit handler (Exit reason=%x)\n", exit_info.exit_reason);
1152         return -1;
1153     }
1154
1155     if (info->timeouts.timeout_active) {
1156         /* Check to see if any timeouts have expired */
1157         v3_handle_timeouts(info, guest_cycles);
1158     }
1159
1160     return 0;
1161 }
1162
1163
1164 int v3_start_vmx_guest(struct guest_info * info) {
1165
1166     PrintDebug(info->vm_info, info, "Starting VMX core %u\n", info->vcpu_id);
1167
1168     if (info->vcpu_id == 0) {
1169         info->core_run_state = CORE_RUNNING;
1170     } else {
1171
1172         PrintDebug(info->vm_info, info, "VMX core %u: Waiting for core initialization\n", info->vcpu_id);
1173
1174         while (info->core_run_state == CORE_STOPPED) {
1175
1176             if (info->vm_info->run_state == VM_STOPPED) {
1177                 // The VM was stopped before this core was initialized.
1178                 return 0;
1179             }
1180
1181             v3_yield(info,-1);
1182             //PrintDebug(info->vm_info, info, "VMX core %u: still waiting for INIT\n",info->vcpu_id);
1183         }
1184
1185         PrintDebug(info->vm_info, info, "VMX core %u initialized\n", info->vcpu_id);
1186
1187         // We'll be paranoid about race conditions here
1188         v3_wait_at_barrier(info);
1189     }
1190
1191
1192     PrintDebug(info->vm_info, info, "VMX core %u: I am starting at CS=0x%x (base=0x%p, limit=0x%x),  RIP=0x%p\n",
1193                info->vcpu_id, info->segments.cs.selector, (void *)(info->segments.cs.base),
1194                info->segments.cs.limit, (void *)(info->rip));
1195
1196
1197     PrintDebug(info->vm_info, info, "VMX core %u: Launching VMX VM on logical core %u\n", info->vcpu_id, info->pcpu_id);
1198
1199     v3_start_time(info);
1200
1201 #ifdef V3_CONFIG_PMU_TELEMETRY
1202     v3_pmu_telemetry_start(info);
1203 #endif
1204
1205     while (1) {
1206
1207         if (info->vm_info->run_state == VM_STOPPED) {
1208             info->core_run_state = CORE_STOPPED;
1209             break;
1210         }
1211
1212         if (v3_vmx_enter(info) == -1) {
1213
1214             addr_t host_addr;
1215             addr_t linear_addr = 0;
1216
1217             info->vm_info->run_state = VM_ERROR;
1218
1219             V3_Print(info->vm_info, info, "VMX core %u: VMX ERROR!!\n", info->vcpu_id);
1220
1221             v3_print_guest_state(info);
1222
1223             V3_Print(info->vm_info, info, "VMX core %u\n", info->vcpu_id);
1224
1225             linear_addr = get_addr_linear(info, info->rip, &(info->segments.cs));
1226
1227             if (info->mem_mode == PHYSICAL_MEM) {
1228                 v3_gpa_to_hva(info, linear_addr, &host_addr);
1229             } else if (info->mem_mode == VIRTUAL_MEM) {
1230                 v3_gva_to_hva(info, linear_addr, &host_addr);
1231             }
1232
1233             V3_Print(info->vm_info, info, "VMX core %u: Host Address of rip = 0x%p\n", info->vcpu_id, (void *)host_addr);
1234
1235             V3_Print(info->vm_info, info, "VMX core %u: Instr (15 bytes) at %p:\n", info->vcpu_id, (void *)host_addr);
1236             v3_dump_mem((uint8_t *)host_addr, 15);
1237
1238             v3_print_stack(info);
1239
1240
1241             v3_print_vmcs();
1242             print_exit_log(info);
1243             return -1;
1244         }
1245
1246         v3_wait_at_barrier(info);
1247
1248
1249         if (info->vm_info->run_state == VM_STOPPED) {
1250             info->core_run_state = CORE_STOPPED;
1251             break;
1252         }
1253 /*
1254         if ((info->num_exits % 5000) == 0) {
1255             V3_Print(info->vm_info, info, "VMX Exit number %d\n", (uint32_t)info->num_exits);
1256         }
1257 */
1258
1259     }
1260
1261 #ifdef V3_CONFIG_PMU_TELEMETRY
1262     v3_pmu_telemetry_end(info);
1263 #endif
1264
1265     return 0;
1266 }
1267
1268
1269
1270
1271 #define VMX_FEATURE_CONTROL_MSR     0x0000003a
1272 #define CPUID_VMX_FEATURES 0x00000005  /* LOCK and VMXON */
1273 #define CPUID_1_ECX_VTXFLAG 0x00000020
1274
1275 int v3_is_vmx_capable() {
1276     v3_msr_t feature_msr;
1277     uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0;
1278
1279     v3_cpuid(0x1, &eax, &ebx, &ecx, &edx);
1280
1281     PrintDebug(VM_NONE, VCORE_NONE, "ECX: 0x%x\n", ecx);
1282
1283     if (ecx & CPUID_1_ECX_VTXFLAG) {
1284         v3_get_msr(VMX_FEATURE_CONTROL_MSR, &(feature_msr.hi), &(feature_msr.lo));
1285
1286         PrintDebug(VM_NONE, VCORE_NONE,  "MSRREGlow: 0x%.8x\n", feature_msr.lo);
1287
1288         if ((feature_msr.lo & CPUID_VMX_FEATURES) != CPUID_VMX_FEATURES) {
1289             PrintDebug(VM_NONE, VCORE_NONE,  "VMX is locked -- enable in the BIOS\n");
1290             return 0;
1291         }
1292
1293     } else {
1294         PrintDebug(VM_NONE, VCORE_NONE,  "VMX not supported on this cpu\n");
1295         return 0;
1296     }
1297
1298     return 1;
1299 }
1300
1301
1302 int v3_reset_vmx_vm_core(struct guest_info * core, addr_t rip) {
1303     // init vmcs bios
1304
1305     if ((core->shdw_pg_mode == NESTED_PAGING) &&
1306         (v3_mach_type == V3_VMX_EPT_UG_CPU)) {
1307         // easy
1308         core->rip = 0;
1309         core->segments.cs.selector = rip << 8;
1310         core->segments.cs.limit = 0xffff;
1311         core->segments.cs.base = rip << 12;
1312     } else {
1313         core->vm_regs.rdx = core->vcpu_id;
1314         core->vm_regs.rbx = rip;
1315     }
1316
1317     return 0;
1318 }
1319
1320
1321
1322 void v3_init_vmx_cpu(int cpu_id) {
1323     addr_t vmx_on_region = 0;
1324     extern v3_cpu_arch_t v3_mach_type;
1325     extern v3_cpu_arch_t v3_cpu_types[];
1326
1327     if (v3_mach_type == V3_INVALID_CPU) {
1328         if (v3_init_vmx_hw(&hw_info) == -1) {
1329             PrintError(VM_NONE, VCORE_NONE, "Could not initialize VMX hardware features on cpu %d\n", cpu_id);
1330             return;
1331         }
1332     }
1333
1334     enable_vmx();
1335
1336
1337     // Setup VMXON Region
1338     vmx_on_region = allocate_vmcs();
1339
1340
1341     if (vmx_on(vmx_on_region) == VMX_SUCCESS) {
1342         V3_Print(VM_NONE, VCORE_NONE,  "VMX Enabled\n");
1343         host_vmcs_ptrs[cpu_id] = vmx_on_region;
1344     } else {
1345         V3_Print(VM_NONE, VCORE_NONE,  "VMX already enabled\n");
1346         V3_FreePages((void *)vmx_on_region, 1);
1347     }
1348
1349     PrintDebug(VM_NONE, VCORE_NONE,  "VMXON pointer: 0x%p\n", (void *)host_vmcs_ptrs[cpu_id]);
1350
1351     {
1352         struct vmx_sec_proc_ctrls sec_proc_ctrls;
1353         sec_proc_ctrls.value = v3_vmx_get_ctrl_features(&(hw_info.sec_proc_ctrls));
1354
1355         if (sec_proc_ctrls.enable_ept == 0) {
1356             V3_Print(VM_NONE, VCORE_NONE, "VMX EPT (Nested) Paging not supported\n");
1357             v3_cpu_types[cpu_id] = V3_VMX_CPU;
1358         } else if (sec_proc_ctrls.unrstrct_guest == 0) {
1359             V3_Print(VM_NONE, VCORE_NONE, "VMX EPT (Nested) Paging supported\n");
1360             v3_cpu_types[cpu_id] = V3_VMX_EPT_CPU;
1361         } else {
1362             V3_Print(VM_NONE, VCORE_NONE, "VMX EPT (Nested) Paging + Unrestricted guest supported\n");
1363             v3_cpu_types[cpu_id] = V3_VMX_EPT_UG_CPU;
1364         }
1365     }
1366
1367 }
1368
1369
1370 void v3_deinit_vmx_cpu(int cpu_id) {
1371     extern v3_cpu_arch_t v3_cpu_types[];
1372     v3_cpu_types[cpu_id] = V3_INVALID_CPU;
1373
1374     if (host_vmcs_ptrs[cpu_id] != 0) {
1375         V3_Print(VM_NONE, VCORE_NONE, "Disabling VMX\n");
1376
1377         if (vmx_off() != VMX_SUCCESS) {
1378             PrintError(VM_NONE, VCORE_NONE, "Error executing VMXOFF\n");
1379         }
1380
1381         V3_FreePages((void *)host_vmcs_ptrs[cpu_id], 1);
1382
1383         host_vmcs_ptrs[cpu_id] = 0;
1384     }
1385 }