palacios/src/palacios/vmx_handler.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, Jack Lange <jarusl@cs.northwestern.edu>
  11  * Copyright (c) 2008, 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 #include <palacios/vmx_handler.h>
  21 #include <palacios/vmm_types.h>
  22 #include <palacios/vmm.h>
  23 #include <palacios/vmcs.h>
  24 #include <palacios/vmx_lowlevel.h>
  25 #include <palacios/vmx_io.h>
  26 #include <palacios/vmm_cpuid.h>
  27 #include <palacios/vmm_debug.h>
  28
  29 #include <palacios/vmx.h>
  30 #include <palacios/vmm_ctrl_regs.h>
  31 #include <palacios/vmm_lowlevel.h>
  32 #include <palacios/vmx_ctrl_regs.h>
  33 #include <palacios/vmx_assist.h>
  34 #include <palacios/vmm_halt.h>
  35 #include <palacios/vmx_ept.h>
  36
  37
  38 #ifndef V3_CONFIG_DEBUG_VMX
  39 #undef PrintDebug
  40 #define PrintDebug(fmt, args...)
  41 #endif
  42
  43 #ifdef V3_CONFIG_TELEMETRY
  44 #include <palacios/vmm_telemetry.h>
  45 #endif
  46
  47 /* At this point the GPRs are already copied into the guest_info state */
  48 int v3_handle_vmx_exit(struct guest_info * info, struct vmx_exit_info * exit_info) {
  49     struct vmx_basic_exit_info * basic_info = (struct vmx_basic_exit_info *)&(exit_info->exit_reason);
  50
  51     /*
  52       PrintError("Handling VMX_EXIT: %s (%u), %lu (0x%lx)\n",
  53       v3_vmx_exit_code_to_str(exit_info->exit_reason),
  54       exit_info->exit_reason,
  55       exit_info->exit_qual, exit_info->exit_qual);
  56
  57       v3_print_vmcs();
  58     */
  59
  60
  61     if (basic_info->entry_error == 1) {
  62         switch (basic_info->reason) {
  63             case VMX_EXIT_INVALID_GUEST_STATE:
  64                 PrintError("VM Entry failed due to invalid guest state\n");
  65                 PrintError("Printing VMCS: (NOTE: This VMCS may not belong to the correct guest)\n");
  66                 v3_print_vmcs();
  67                 break;
  68             case VMX_EXIT_INVALID_MSR_LOAD:
  69                 PrintError("VM Entry failed due to error loading MSRs\n");
  70                 break;
  71             default:
  72                 PrintError("Entry failed for unknown reason (%d)\n", basic_info->reason);
  73                 break;
  74         }
  75
  76         return -1;
  77     }
  78
  79
  80
  81 #ifdef V3_CONFIG_TELEMETRY
  82     if (info->vm_info->enable_telemetry) {
  83         v3_telemetry_start_exit(info);
  84     }
  85 #endif
  86
  87     switch (basic_info->reason) {
  88         case VMX_EXIT_INFO_EXCEPTION_OR_NMI: {
  89             pf_error_t error_code = *(pf_error_t *)&(exit_info->int_err);
  90
  91
  92             // JRL: Change "0x0e" to a macro value
  93             if ((uint8_t)exit_info->int_info == 14) {
  94 #ifdef V3_CONFIG_DEBUG_SHADOW_PAGING
  95                 PrintDebug("Page Fault at %p error_code=%x\n", (void *)exit_info->exit_qual, *(uint32_t *)&error_code);
  96 #endif
  97
  98                 if (info->shdw_pg_mode == SHADOW_PAGING) {
  99                     if (v3_handle_shadow_pagefault(info, (addr_t)exit_info->exit_qual, error_code) == -1) {
 100                         PrintError("Error handling shadow page fault\n");
 101                         return -1;
 102                     }
 103
 104                 } else {
 105                     PrintError("Page fault in unimplemented paging mode\n");
 106                     return -1;
 107                 }
 108             } else if ((uint8_t)exit_info->int_info == 2) {
 109                 // NMI. Don't do anything
 110                 V3_Print("NMI Exception Received\n");
 111             } else {
 112                 PrintError("Unknown exception: 0x%x\n", (uint8_t)exit_info->int_info);
 113                 v3_print_GPRs(info);
 114                 return -1;
 115             }
 116             break;
 117         }
 118
 119         case VMX_EXIT_EPT_VIOLATION: {
 120             struct ept_exit_qual * ept_qual = (struct ept_exit_qual *)&(exit_info->exit_qual);
 121
 122             if (v3_handle_ept_fault(info, exit_info->ept_fault_addr, ept_qual) == -1) {
 123                 PrintError("Error handling EPT fault\n");
 124                 return -1;
 125             }
 126
 127             break;
 128         }
 129         case VMX_EXIT_INVLPG:
 130             if (info->shdw_pg_mode == SHADOW_PAGING) {
 131                 if (v3_handle_shadow_invlpg(info) == -1) {
 132                     PrintError("Error handling INVLPG\n");
 133                     return -1;
 134                 }
 135             }
 136
 137             break;
 138
 139         case VMX_EXIT_RDTSC:
 140 #ifdef V3_CONFIG_DEBUG_TIME
 141             PrintDebug("RDTSC\n");
 142 #endif
 143             if (v3_handle_rdtsc(info) == -1) {
 144                 PrintError("Error Handling RDTSC instruction\n");
 145                 return -1;
 146             }
 147
 148             break;
 149
 150         case VMX_EXIT_CPUID:
 151             if (v3_handle_cpuid(info) == -1) {
 152                 PrintError("Error Handling CPUID instruction\n");
 153                 return -1;
 154             }
 155
 156             break;
 157         case VMX_EXIT_RDMSR:
 158             if (v3_handle_msr_read(info) == -1) {
 159                 PrintError("Error handling MSR Read\n");
 160                 return -1;
 161             }
 162
 163             break;
 164         case VMX_EXIT_WRMSR:
 165             if (v3_handle_msr_write(info) == -1) {
 166                 PrintError("Error handling MSR Write\n");
 167                 return -1;
 168             }
 169
 170             break;
 171         case VMX_EXIT_VMCALL:
 172             /*
 173              * Hypercall
 174              */
 175
 176             // VMCALL is a 3 byte op
 177             // We do this early because some hypercalls can change the rip...
 178             info->rip += 3;
 179
 180             if (v3_handle_hypercall(info) == -1) {
 181                 return -1;
 182             }
 183             break;
 184         case VMX_EXIT_IO_INSTR: {
 185             struct vmx_exit_io_qual * io_qual = (struct vmx_exit_io_qual *)&(exit_info->exit_qual);
 186
 187             if (io_qual->dir == 0) {
 188                 if (io_qual->string) {
 189                     if (v3_handle_vmx_io_outs(info, exit_info) == -1) {
 190                         PrintError("Error in outs IO handler\n");
 191                         return -1;
 192                     }
 193                 } else {
 194                     if (v3_handle_vmx_io_out(info, exit_info) == -1) {
 195                         PrintError("Error in out IO handler\n");
 196                         return -1;
 197                     }
 198                 }
 199             } else {
 200                 if (io_qual->string) {
 201                     if(v3_handle_vmx_io_ins(info, exit_info) == -1) {
 202                         PrintError("Error in ins IO handler\n");
 203                         return -1;
 204                     }
 205                 } else {
 206                     if (v3_handle_vmx_io_in(info, exit_info) == -1) {
 207                         PrintError("Error in in IO handler\n");
 208                         return -1;
 209                     }
 210                 }
 211             }
 212             break;
 213         }
 214         case VMX_EXIT_CR_REG_ACCESSES: {
 215             struct vmx_exit_cr_qual * cr_qual = (struct vmx_exit_cr_qual *)&(exit_info->exit_qual);
 216
 217             // PrintDebug("Control register: %d\n", cr_qual->access_type);
 218             switch(cr_qual->cr_id) {
 219                 case 0:
 220                     //PrintDebug("Handling CR0 Access\n");
 221                     if (v3_vmx_handle_cr0_access(info, cr_qual, exit_info) == -1) {
 222                         PrintError("Error in CR0 access handler\n");
 223                         return -1;
 224                     }
 225                     break;
 226                 case 3:
 227                     //PrintDebug("Handling CR3 Access\n");
 228                     if (v3_vmx_handle_cr3_access(info, cr_qual) == -1) {
 229                         PrintError("Error in CR3 access handler\n");
 230                         return -1;
 231                     }
 232                     break;
 233                 case 4:
 234                     //PrintDebug("Handling CR4 Access\n");
 235                     if (v3_vmx_handle_cr4_access(info, cr_qual) == -1) {
 236                         PrintError("Error in CR4 access handler\n");
 237                         return -1;
 238                     }
 239                     break;
 240                 default:
 241                     PrintError("Unhandled CR access: %d\n", cr_qual->cr_id);
 242                     return -1;
 243             }
 244
 245             // TODO: move RIP increment into all of the above individual CR
 246             //       handlers, not just v3_vmx_handle_cr4_access()
 247             if (cr_qual->cr_id != 4)
 248                 info->rip += exit_info->instr_len;
 249
 250             break;
 251         }
 252         case VMX_EXIT_HLT:
 253             PrintDebug("Guest halted\n");
 254
 255             if (v3_handle_halt(info) == -1) {
 256                 PrintError("Error handling halt instruction\n");
 257                 return -1;
 258             }
 259
 260             break;
 261
 262
 263
 264         case VMX_EXIT_PAUSE:
 265             // Handled as NOP
 266             info->rip += 2;
 267
 268             break;
 269         case VMX_EXIT_EXTERNAL_INTR:
 270             // Interrupts are handled outside switch
 271             break;
 272         case VMX_EXIT_INTR_WINDOW:
 273             // This is handled in the atomic part of the vmx code,
 274             // not in the generic (interruptable) vmx handler
 275             break;
 276         case VMX_EXIT_EXPIRED_PREEMPT_TIMER:
 277             V3_Print("VMX Preempt Timer Expired.\n");
 278             // This just forces an exit and is handled outside the switch
 279             break;
 280
 281         default:
 282             PrintError("Unhandled VMX_EXIT: %s (%u), %lu (0x%lx)\n",
 283                        v3_vmx_exit_code_to_str(basic_info->reason),
 284                        basic_info->reason,
 285                        exit_info->exit_qual, exit_info->exit_qual);
 286             return -1;
 287     }
 288
 289
 290 #ifdef V3_CONFIG_TELEMETRY
 291     if (info->vm_info->enable_telemetry) {
 292         v3_telemetry_end_exit(info, exit_info->exit_reason);
 293     }
 294 #endif
 295
 296
 297     return 0;
 298 }
 299
 300 static const char VMX_EXIT_INFO_EXCEPTION_OR_NMI_STR[] = "VMX_EXIT_INFO_EXCEPTION_OR_NMI";
 301 static const char VMX_EXIT_EXTERNAL_INTR_STR[] = "VMX_EXIT_EXTERNAL_INTR";
 302 static const char VMX_EXIT_TRIPLE_FAULT_STR[] = "VMX_EXIT_TRIPLE_FAULT";
 303 static const char VMX_EXIT_INIT_SIGNAL_STR[] = "VMX_EXIT_INIT_SIGNAL";
 304 static const char VMX_EXIT_STARTUP_IPI_STR[] = "VMX_EXIT_STARTUP_IPI";
 305 static const char VMX_EXIT_IO_SMI_STR[] = "VMX_EXIT_IO_SMI";
 306 static const char VMX_EXIT_OTHER_SMI_STR[] = "VMX_EXIT_OTHER_SMI";
 307 static const char VMX_EXIT_INTR_WINDOW_STR[] = "VMX_EXIT_INTR_WINDOW";
 308 static const char VMX_EXIT_NMI_WINDOW_STR[] = "VMX_EXIT_NMI_WINDOW";
 309 static const char VMX_EXIT_TASK_SWITCH_STR[] = "VMX_EXIT_TASK_SWITCH";
 310 static const char VMX_EXIT_CPUID_STR[] = "VMX_EXIT_CPUID";
 311 static const char VMX_EXIT_HLT_STR[] = "VMX_EXIT_HLT";
 312 static const char VMX_EXIT_INVD_STR[] = "VMX_EXIT_INVD";
 313 static const char VMX_EXIT_INVLPG_STR[] = "VMX_EXIT_INVLPG";
 314 static const char VMX_EXIT_RDPMC_STR[] = "VMX_EXIT_RDPMC";
 315 static const char VMX_EXIT_RDTSC_STR[] = "VMX_EXIT_RDTSC";
 316 static const char VMX_EXIT_RSM_STR[] = "VMX_EXIT_RSM";
 317 static const char VMX_EXIT_VMCALL_STR[] = "VMX_EXIT_VMCALL";
 318 static const char VMX_EXIT_VMCLEAR_STR[] = "VMX_EXIT_VMCLEAR";
 319 static const char VMX_EXIT_VMLAUNCH_STR[] = "VMX_EXIT_VMLAUNCH";
 320 static const char VMX_EXIT_VMPTRLD_STR[] = "VMX_EXIT_VMPTRLD";
 321 static const char VMX_EXIT_VMPTRST_STR[] = "VMX_EXIT_VMPTRST";
 322 static const char VMX_EXIT_VMREAD_STR[] = "VMX_EXIT_VMREAD";
 323 static const char VMX_EXIT_VMRESUME_STR[] = "VMX_EXIT_VMRESUME";
 324 static const char VMX_EXIT_VMWRITE_STR[] = "VMX_EXIT_VMWRITE";
 325 static const char VMX_EXIT_VMXOFF_STR[] = "VMX_EXIT_VMXOFF";
 326 static const char VMX_EXIT_VMXON_STR[] = "VMX_EXIT_VMXON";
 327 static const char VMX_EXIT_CR_REG_ACCESSES_STR[] = "VMX_EXIT_CR_REG_ACCESSES";
 328 static const char VMX_EXIT_MOV_DR_STR[] = "VMX_EXIT_MOV_DR";
 329 static const char VMX_EXIT_IO_INSTR_STR[] = "VMX_EXIT_IO_INSTR";
 330 static const char VMX_EXIT_RDMSR_STR[] = "VMX_EXIT_RDMSR";
 331 static const char VMX_EXIT_WRMSR_STR[] = "VMX_EXIT_WRMSR";
 332 static const char VMX_EXIT_INVALID_GUEST_STATE_STR[] = "VMX_EXIT_INVALID_GUEST_STATE";
 333 static const char VMX_EXIT_INVALID_MSR_LOAD_STR[] = "VMX_EXIT_INVALID_MSR_LOAD";
 334 static const char VMX_EXIT_MWAIT_STR[] = "VMX_EXIT_MWAIT";
 335 static const char VMX_EXIT_MONITOR_STR[] = "VMX_EXIT_MONITOR";
 336 static const char VMX_EXIT_PAUSE_STR[] = "VMX_EXIT_PAUSE";
 337 static const char VMX_EXIT_INVALID_MACHINE_CHECK_STR[] = "VMX_EXIT_INVALIDE_MACHINE_CHECK";
 338 static const char VMX_EXIT_TPR_BELOW_THRESHOLD_STR[] = "VMX_EXIT_TPR_BELOW_THRESHOLD";
 339 static const char VMX_EXIT_APIC_STR[] = "VMX_EXIT_APIC";
 340 static const char VMX_EXIT_GDTR_IDTR_STR[] = "VMX_EXIT_GDTR_IDTR";
 341 static const char VMX_EXIT_LDTR_TR_STR[] = "VMX_EXIT_LDTR_TR";
 342 static const char VMX_EXIT_EPT_VIOLATION_STR[] = "VMX_EXIT_EPT_VIOLATION";
 343 static const char VMX_EXIT_EPT_CONFIG_STR[] = "VMX_EXIT_EPT_CONFIG";
 344 static const char VMX_EXIT_INVEPT_STR[] = "VMX_EXIT_INVEPT";
 345 static const char VMX_EXIT_RDTSCP_STR[] = "VMX_EXIT_RDTSCP";
 346 static const char VMX_EXIT_EXPIRED_PREEMPT_TIMER_STR[] = "VMX_EXIT_EXPIRED_PREEMPT_TIMER";
 347 static const char VMX_EXIT_INVVPID_STR[] = "VMX_EXIT_INVVPID";
 348 static const char VMX_EXIT_WBINVD_STR[] = "VMX_EXIT_WBINVD";
 349 static const char VMX_EXIT_XSETBV_STR[] = "VMX_EXIT_XSETBV";
 350
 351 const char * v3_vmx_exit_code_to_str(vmx_exit_t exit)
 352 {
 353     switch (exit) {
 354         case VMX_EXIT_INFO_EXCEPTION_OR_NMI:
 355             return VMX_EXIT_INFO_EXCEPTION_OR_NMI_STR;
 356         case VMX_EXIT_EXTERNAL_INTR:
 357             return VMX_EXIT_EXTERNAL_INTR_STR;
 358         case VMX_EXIT_TRIPLE_FAULT:
 359             return VMX_EXIT_TRIPLE_FAULT_STR;
 360         case VMX_EXIT_INIT_SIGNAL:
 361             return VMX_EXIT_INIT_SIGNAL_STR;
 362         case VMX_EXIT_STARTUP_IPI:
 363             return VMX_EXIT_STARTUP_IPI_STR;
 364         case VMX_EXIT_IO_SMI:
 365             return VMX_EXIT_IO_SMI_STR;
 366         case VMX_EXIT_OTHER_SMI:
 367             return VMX_EXIT_OTHER_SMI_STR;
 368         case VMX_EXIT_INTR_WINDOW:
 369             return VMX_EXIT_INTR_WINDOW_STR;
 370         case VMX_EXIT_NMI_WINDOW:
 371             return VMX_EXIT_NMI_WINDOW_STR;
 372         case VMX_EXIT_TASK_SWITCH:
 373             return VMX_EXIT_TASK_SWITCH_STR;
 374         case VMX_EXIT_CPUID:
 375             return VMX_EXIT_CPUID_STR;
 376         case VMX_EXIT_HLT:
 377             return VMX_EXIT_HLT_STR;
 378         case VMX_EXIT_INVD:
 379             return VMX_EXIT_INVD_STR;
 380         case VMX_EXIT_INVLPG:
 381             return VMX_EXIT_INVLPG_STR;
 382         case VMX_EXIT_RDPMC:
 383             return VMX_EXIT_RDPMC_STR;
 384         case VMX_EXIT_RDTSC:
 385             return VMX_EXIT_RDTSC_STR;
 386         case VMX_EXIT_RSM:
 387             return VMX_EXIT_RSM_STR;
 388         case VMX_EXIT_VMCALL:
 389             return VMX_EXIT_VMCALL_STR;
 390         case VMX_EXIT_VMCLEAR:
 391             return VMX_EXIT_VMCLEAR_STR;
 392         case VMX_EXIT_VMLAUNCH:
 393             return VMX_EXIT_VMLAUNCH_STR;
 394         case VMX_EXIT_VMPTRLD:
 395             return VMX_EXIT_VMPTRLD_STR;
 396         case VMX_EXIT_VMPTRST:
 397             return VMX_EXIT_VMPTRST_STR;
 398         case VMX_EXIT_VMREAD:
 399             return VMX_EXIT_VMREAD_STR;
 400         case VMX_EXIT_VMRESUME:
 401             return VMX_EXIT_VMRESUME_STR;
 402         case VMX_EXIT_VMWRITE:
 403             return VMX_EXIT_VMWRITE_STR;
 404         case VMX_EXIT_VMXOFF:
 405             return VMX_EXIT_VMXOFF_STR;
 406         case VMX_EXIT_VMXON:
 407             return VMX_EXIT_VMXON_STR;
 408         case VMX_EXIT_CR_REG_ACCESSES:
 409             return VMX_EXIT_CR_REG_ACCESSES_STR;
 410         case VMX_EXIT_MOV_DR:
 411             return VMX_EXIT_MOV_DR_STR;
 412         case VMX_EXIT_IO_INSTR:
 413             return VMX_EXIT_IO_INSTR_STR;
 414         case VMX_EXIT_RDMSR:
 415             return VMX_EXIT_RDMSR_STR;
 416         case VMX_EXIT_WRMSR:
 417             return VMX_EXIT_WRMSR_STR;
 418         case VMX_EXIT_INVALID_GUEST_STATE:
 419             return VMX_EXIT_INVALID_GUEST_STATE_STR;
 420         case VMX_EXIT_INVALID_MSR_LOAD:
 421             return VMX_EXIT_INVALID_MSR_LOAD_STR;
 422         case VMX_EXIT_MWAIT:
 423             return VMX_EXIT_MWAIT_STR;
 424         case VMX_EXIT_MONITOR:
 425             return VMX_EXIT_MONITOR_STR;
 426         case VMX_EXIT_PAUSE:
 427             return VMX_EXIT_PAUSE_STR;
 428         case VMX_EXIT_INVALID_MACHINE_CHECK:
 429             return VMX_EXIT_INVALID_MACHINE_CHECK_STR;
 430         case VMX_EXIT_TPR_BELOW_THRESHOLD:
 431             return VMX_EXIT_TPR_BELOW_THRESHOLD_STR;
 432         case VMX_EXIT_APIC:
 433             return VMX_EXIT_APIC_STR;
 434         case VMX_EXIT_GDTR_IDTR:
 435             return VMX_EXIT_GDTR_IDTR_STR;
 436         case VMX_EXIT_LDTR_TR:
 437             return VMX_EXIT_LDTR_TR_STR;
 438         case VMX_EXIT_EPT_VIOLATION:
 439             return VMX_EXIT_EPT_VIOLATION_STR;
 440         case VMX_EXIT_EPT_CONFIG:
 441             return VMX_EXIT_EPT_CONFIG_STR;
 442         case VMX_EXIT_INVEPT:
 443             return VMX_EXIT_INVEPT_STR;
 444         case VMX_EXIT_RDTSCP:
 445             return VMX_EXIT_RDTSCP_STR;
 446         case VMX_EXIT_EXPIRED_PREEMPT_TIMER:
 447             return VMX_EXIT_EXPIRED_PREEMPT_TIMER_STR;
 448         case VMX_EXIT_INVVPID:
 449             return VMX_EXIT_INVVPID_STR;
 450         case VMX_EXIT_WBINVD:
 451             return VMX_EXIT_WBINVD_STR;
 452         case VMX_EXIT_XSETBV:
 453             return VMX_EXIT_XSETBV_STR;
 454     }
 455     return NULL;
 456 }
 457