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
  28 #include <palacios/vmx.h>
  29 #include <palacios/vmm_ctrl_regs.h>
  30 #include <palacios/vmm_lowlevel.h>
  31 #include <palacios/vmx_ctrl_regs.h>
  32 #include <palacios/vmx_assist.h>
  33 #include <palacios/vmm_halt.h>
  34 #include <palacios/vmx_ept.h>
  35
  36 #ifndef V3_CONFIG_DEBUG_VMX
  37 #undef PrintDebug
  38 #define PrintDebug(fmt, args...)
  39 #endif
  40
  41 #ifdef V3_CONFIG_TELEMETRY
  42 #include <palacios/vmm_telemetry.h>
  43 #endif
  44
  45 /* At this point the GPRs are already copied into the guest_info state */
  46 int v3_handle_vmx_exit(struct guest_info * info, struct vmx_exit_info * exit_info) {
  47     struct vmx_basic_exit_info * basic_info = (struct vmx_basic_exit_info *)&(exit_info->exit_reason);
  48
  49     /*
  50       PrintError("Handling VMEXIT: %s (%u), %lu (0x%lx)\n",
  51       v3_vmx_exit_code_to_str(exit_info->exit_reason),
  52       exit_info->exit_reason,
  53       exit_info->exit_qual, exit_info->exit_qual);
  54
  55       v3_print_vmcs();
  56     */
  57
  58
  59     if (basic_info->entry_error == 1) {
  60         switch (basic_info->reason) {
  61             case VMEXIT_INVALID_GUEST_STATE:
  62                 PrintError("VM Entry failed due to invalid guest state\n");
  63                 PrintError("Printing VMCS: (NOTE: This VMCS may not belong to the correct guest)\n");
  64                 v3_print_vmcs();
  65                 break;
  66             case VMEXIT_INVALID_MSR_LOAD:
  67                 PrintError("VM Entry failed due to error loading MSRs\n");
  68                 break;
  69             default:
  70                 PrintError("Entry failed for unknown reason (%d)\n", basic_info->reason);
  71                 break;
  72         }
  73
  74         return -1;
  75     }
  76
  77
  78 #ifdef V3_CONFIG_TELEMETRY
  79     if (info->vm_info->enable_telemetry) {
  80         v3_telemetry_start_exit(info);
  81     }
  82 #endif
  83
  84     switch (basic_info->reason) {
  85         case VMEXIT_INFO_EXCEPTION_OR_NMI: {
  86             pf_error_t error_code = *(pf_error_t *)&(exit_info->int_err);
  87
  88
  89             // JRL: Change "0x0e" to a macro value
  90             if ((uint8_t)exit_info->int_info == 14) {
  91 #ifdef V3_CONFIG_DEBUG_SHADOW_PAGING
  92                 PrintDebug("Page Fault at %p error_code=%x\n", (void *)exit_info->exit_qual, *(uint32_t *)&error_code);
  93 #endif
  94
  95                 if (info->shdw_pg_mode == SHADOW_PAGING) {
  96                     if (v3_handle_shadow_pagefault(info, (addr_t)exit_info->exit_qual, error_code) == -1) {
  97                         PrintError("Error handling shadow page fault\n");
  98                         return -1;
  99                     }
 100
 101                 } else {
 102                     PrintError("Page fault in unimplemented paging mode\n");
 103                     return -1;
 104                 }
 105             } else if ((uint8_t)exit_info->int_info == 2) {
 106                 // NMI. Don't do anything
 107                 V3_Print("NMI Exception Received\n");
 108             } else {
 109                 PrintError("Unknown exception: 0x%x\n", (uint8_t)exit_info->int_info);
 110                 v3_print_GPRs(info);
 111                 return -1;
 112             }
 113             break;
 114         }
 115
 116         case VMEXIT_EPT_VIOLATION: {
 117             struct ept_exit_qual * ept_qual = (struct ept_exit_qual *)&(exit_info->exit_qual);
 118
 119             if (v3_handle_ept_fault(info, exit_info->ept_fault_addr, ept_qual) == -1) {
 120                 PrintError("Error handling EPT fault\n");
 121                 return -1;
 122             }
 123
 124             break;
 125         }
 126         case VMEXIT_INVLPG:
 127             if (info->shdw_pg_mode == SHADOW_PAGING) {
 128                 if (v3_handle_shadow_invlpg(info) == -1) {
 129                     PrintError("Error handling INVLPG\n");
 130                     return -1;
 131                 }
 132             }
 133
 134             break;
 135
 136         case VMEXIT_RDTSC:
 137 #ifdef V3_CONFIG_DEBUG_TIME
 138             PrintDebug("RDTSC\n");
 139 #endif
 140             if (v3_handle_rdtsc(info) == -1) {
 141                 PrintError("Error Handling RDTSC instruction\n");
 142                 return -1;
 143             }
 144
 145             break;
 146
 147         case VMEXIT_CPUID:
 148             if (v3_handle_cpuid(info) == -1) {
 149                 PrintError("Error Handling CPUID instruction\n");
 150                 return -1;
 151             }
 152
 153             break;
 154         case VMEXIT_RDMSR:
 155             if (v3_handle_msr_read(info) == -1) {
 156                 PrintError("Error handling MSR Read\n");
 157                 return -1;
 158             }
 159
 160             break;
 161         case VMEXIT_WRMSR:
 162             if (v3_handle_msr_write(info) == -1) {
 163                 PrintError("Error handling MSR Write\n");
 164                 return -1;
 165             }
 166
 167             break;
 168         case VMEXIT_VMCALL:
 169             /*
 170              * Hypercall
 171              */
 172
 173             // VMCALL is a 3 byte op
 174             // We do this early because some hypercalls can change the rip...
 175             info->rip += 3;
 176
 177             if (v3_handle_hypercall(info) == -1) {
 178                 return -1;
 179             }
 180             break;
 181         case VMEXIT_IO_INSTR: {
 182             struct vmx_exit_io_qual * io_qual = (struct vmx_exit_io_qual *)&(exit_info->exit_qual);
 183
 184             if (io_qual->dir == 0) {
 185                 if (io_qual->string) {
 186                     if (v3_handle_vmx_io_outs(info, exit_info) == -1) {
 187                         PrintError("Error in outs IO handler\n");
 188                         return -1;
 189                     }
 190                 } else {
 191                     if (v3_handle_vmx_io_out(info, exit_info) == -1) {
 192                         PrintError("Error in out IO handler\n");
 193                         return -1;
 194                     }
 195                 }
 196             } else {
 197                 if (io_qual->string) {
 198                     if(v3_handle_vmx_io_ins(info, exit_info) == -1) {
 199                         PrintError("Error in ins IO handler\n");
 200                         return -1;
 201                     }
 202                 } else {
 203                     if (v3_handle_vmx_io_in(info, exit_info) == -1) {
 204                         PrintError("Error in in IO handler\n");
 205                         return -1;
 206                     }
 207                 }
 208             }
 209             break;
 210         }
 211         case VMEXIT_CR_REG_ACCESSES: {
 212             struct vmx_exit_cr_qual * cr_qual = (struct vmx_exit_cr_qual *)&(exit_info->exit_qual);
 213
 214             // PrintDebug("Control register: %d\n", cr_qual->access_type);
 215             switch(cr_qual->cr_id) {
 216                 case 0:
 217                     //PrintDebug("Handling CR0 Access\n");
 218                     if (v3_vmx_handle_cr0_access(info, cr_qual, exit_info) == -1) {
 219                         PrintError("Error in CR0 access handler\n");
 220                         return -1;
 221                     }
 222                     break;
 223                 case 3:
 224                     //PrintDebug("Handling CR3 Access\n");
 225                     if (v3_vmx_handle_cr3_access(info, cr_qual) == -1) {
 226                         PrintError("Error in CR3 access handler\n");
 227                         return -1;
 228                     }
 229                     break;
 230                 case 4:
 231                     //PrintDebug("Handling CR4 Access\n");
 232                     if (v3_vmx_handle_cr4_access(info, cr_qual) == -1) {
 233                         PrintError("Error in CR4 access handler\n");
 234                         return -1;
 235                     }
 236                     break;
 237                 default:
 238                     PrintError("Unhandled CR access: %d\n", cr_qual->cr_id);
 239                     return -1;
 240             }
 241
 242             // TODO: move RIP increment into all of the above individual CR
 243             //       handlers, not just v3_vmx_handle_cr4_access()
 244             if (cr_qual->cr_id != 4)
 245                 info->rip += exit_info->instr_len;
 246
 247             break;
 248         }
 249         case VMEXIT_HLT:
 250             PrintDebug("Guest halted\n");
 251
 252             if (v3_handle_halt(info) == -1) {
 253                 PrintError("Error handling halt instruction\n");
 254                 return -1;
 255             }
 256
 257             break;
 258
 259
 260
 261         case VMEXIT_PAUSE:
 262             // Handled as NOP
 263             info->rip += 2;
 264
 265             break;
 266         case VMEXIT_EXTERNAL_INTR:
 267             // Interrupts are handled outside switch
 268             break;
 269         case VMEXIT_INTR_WINDOW:
 270             // This is handled in the atomic part of the vmx code,
 271             // not in the generic (interruptable) vmx handler
 272             break;
 273         case VMEXIT_EXPIRED_PREEMPT_TIMER:
 274             V3_Print("VMX Preempt Timer Expired.\n");
 275             // This just forces an exit and is handled outside the switch
 276             break;
 277
 278         default:
 279             PrintError("Unhandled VMEXIT: %s (%u), %lu (0x%lx)\n",
 280                        v3_vmx_exit_code_to_str(basic_info->reason),
 281                        basic_info->reason,
 282                        exit_info->exit_qual, exit_info->exit_qual);
 283             return -1;
 284     }
 285
 286
 287 #ifdef V3_CONFIG_TELEMETRY
 288     if (info->vm_info->enable_telemetry) {
 289         v3_telemetry_end_exit(info, exit_info->exit_reason);
 290     }
 291 #endif
 292
 293
 294     return 0;
 295 }
 296
 297 static const char VMEXIT_INFO_EXCEPTION_OR_NMI_STR[] = "VMEXIT_INFO_EXCEPTION_OR_NMI";
 298 static const char VMEXIT_EXTERNAL_INTR_STR[] = "VMEXIT_EXTERNAL_INTR";
 299 static const char VMEXIT_TRIPLE_FAULT_STR[] = "VMEXIT_TRIPLE_FAULT";
 300 static const char VMEXIT_INIT_SIGNAL_STR[] = "VMEXIT_INIT_SIGNAL";
 301 static const char VMEXIT_STARTUP_IPI_STR[] = "VMEXIT_STARTUP_IPI";
 302 static const char VMEXIT_IO_SMI_STR[] = "VMEXIT_IO_SMI";
 303 static const char VMEXIT_OTHER_SMI_STR[] = "VMEXIT_OTHER_SMI";
 304 static const char VMEXIT_INTR_WINDOW_STR[] = "VMEXIT_INTR_WINDOW";
 305 static const char VMEXIT_NMI_WINDOW_STR[] = "VMEXIT_NMI_WINDOW";
 306 static const char VMEXIT_TASK_SWITCH_STR[] = "VMEXIT_TASK_SWITCH";
 307 static const char VMEXIT_CPUID_STR[] = "VMEXIT_CPUID";
 308 static const char VMEXIT_HLT_STR[] = "VMEXIT_HLT";
 309 static const char VMEXIT_INVD_STR[] = "VMEXIT_INVD";
 310 static const char VMEXIT_INVLPG_STR[] = "VMEXIT_INVLPG";
 311 static const char VMEXIT_RDPMC_STR[] = "VMEXIT_RDPMC";
 312 static const char VMEXIT_RDTSC_STR[] = "VMEXIT_RDTSC";
 313 static const char VMEXIT_RSM_STR[] = "VMEXIT_RSM";
 314 static const char VMEXIT_VMCALL_STR[] = "VMEXIT_VMCALL";
 315 static const char VMEXIT_VMCLEAR_STR[] = "VMEXIT_VMCLEAR";
 316 static const char VMEXIT_VMLAUNCH_STR[] = "VMEXIT_VMLAUNCH";
 317 static const char VMEXIT_VMPTRLD_STR[] = "VMEXIT_VMPTRLD";
 318 static const char VMEXIT_VMPTRST_STR[] = "VMEXIT_VMPTRST";
 319 static const char VMEXIT_VMREAD_STR[] = "VMEXIT_VMREAD";
 320 static const char VMEXIT_VMRESUME_STR[] = "VMEXIT_VMRESUME";
 321 static const char VMEXIT_VMWRITE_STR[] = "VMEXIT_VMWRITE";
 322 static const char VMEXIT_VMXOFF_STR[] = "VMEXIT_VMXOFF";
 323 static const char VMEXIT_VMXON_STR[] = "VMEXIT_VMXON";
 324 static const char VMEXIT_CR_REG_ACCESSES_STR[] = "VMEXIT_CR_REG_ACCESSES";
 325 static const char VMEXIT_MOV_DR_STR[] = "VMEXIT_MOV_DR";
 326 static const char VMEXIT_IO_INSTR_STR[] = "VMEXIT_IO_INSTR";
 327 static const char VMEXIT_RDMSR_STR[] = "VMEXIT_RDMSR";
 328 static const char VMEXIT_WRMSR_STR[] = "VMEXIT_WRMSR";
 329 static const char VMEXIT_INVALID_GUEST_STATE_STR[] = "VMEXIT_INVALID_GUEST_STATE";
 330 static const char VMEXIT_INVALID_MSR_LOAD_STR[] = "VMEXIT_INVALID_MSR_LOAD";
 331 static const char VMEXIT_MWAIT_STR[] = "VMEXIT_MWAIT";
 332 static const char VMEXIT_MONITOR_STR[] = "VMEXIT_MONITOR";
 333 static const char VMEXIT_PAUSE_STR[] = "VMEXIT_PAUSE";
 334 static const char VMEXIT_INVALID_MACHINE_CHECK_STR[] = "VMEXIT_INVALIDE_MACHINE_CHECK";
 335 static const char VMEXIT_TPR_BELOW_THRESHOLD_STR[] = "VMEXIT_TPR_BELOW_THRESHOLD";
 336 static const char VMEXIT_APIC_STR[] = "VMEXIT_APIC";
 337 static const char VMEXIT_GDTR_IDTR_STR[] = "VMEXIT_GDTR_IDTR";
 338 static const char VMEXIT_LDTR_TR_STR[] = "VMEXIT_LDTR_TR";
 339 static const char VMEXIT_EPT_VIOLATION_STR[] = "VMEXIT_EPT_VIOLATION";
 340 static const char VMEXIT_EPT_CONFIG_STR[] = "VMEXIT_EPT_CONFIG";
 341 static const char VMEXIT_INVEPT_STR[] = "VMEXIT_INVEPT";
 342 static const char VMEXIT_RDTSCP_STR[] = "VMEXIT_RDTSCP";
 343 static const char VMEXIT_EXPIRED_PREEMPT_TIMER_STR[] = "VMEXIT_EXPIRED_PREEMPT_TIMER";
 344 static const char VMEXIT_INVVPID_STR[] = "VMEXIT_INVVPID";
 345 static const char VMEXIT_WBINVD_STR[] = "VMEXIT_WBINVD";
 346 static const char VMEXIT_XSETBV_STR[] = "VMEXIT_XSETBV";
 347
 348 const char * v3_vmx_exit_code_to_str(vmx_exit_t exit)
 349 {
 350     switch(exit) {
 351         case VMEXIT_INFO_EXCEPTION_OR_NMI:
 352             return VMEXIT_INFO_EXCEPTION_OR_NMI_STR;
 353         case VMEXIT_EXTERNAL_INTR:
 354             return VMEXIT_EXTERNAL_INTR_STR;
 355         case VMEXIT_TRIPLE_FAULT:
 356             return VMEXIT_TRIPLE_FAULT_STR;
 357         case VMEXIT_INIT_SIGNAL:
 358             return VMEXIT_INIT_SIGNAL_STR;
 359         case VMEXIT_STARTUP_IPI:
 360             return VMEXIT_STARTUP_IPI_STR;
 361         case VMEXIT_IO_SMI:
 362             return VMEXIT_IO_SMI_STR;
 363         case VMEXIT_OTHER_SMI:
 364             return VMEXIT_OTHER_SMI_STR;
 365         case VMEXIT_INTR_WINDOW:
 366             return VMEXIT_INTR_WINDOW_STR;
 367         case VMEXIT_NMI_WINDOW:
 368             return VMEXIT_NMI_WINDOW_STR;
 369         case VMEXIT_TASK_SWITCH:
 370             return VMEXIT_TASK_SWITCH_STR;
 371         case VMEXIT_CPUID:
 372             return VMEXIT_CPUID_STR;
 373         case VMEXIT_HLT:
 374             return VMEXIT_HLT_STR;
 375         case VMEXIT_INVD:
 376             return VMEXIT_INVD_STR;
 377         case VMEXIT_INVLPG:
 378             return VMEXIT_INVLPG_STR;
 379         case VMEXIT_RDPMC:
 380             return VMEXIT_RDPMC_STR;
 381         case VMEXIT_RDTSC:
 382             return VMEXIT_RDTSC_STR;
 383         case VMEXIT_RSM:
 384             return VMEXIT_RSM_STR;
 385         case VMEXIT_VMCALL:
 386             return VMEXIT_VMCALL_STR;
 387         case VMEXIT_VMCLEAR:
 388             return VMEXIT_VMCLEAR_STR;
 389         case VMEXIT_VMLAUNCH:
 390             return VMEXIT_VMLAUNCH_STR;
 391         case VMEXIT_VMPTRLD:
 392             return VMEXIT_VMPTRLD_STR;
 393         case VMEXIT_VMPTRST:
 394             return VMEXIT_VMPTRST_STR;
 395         case VMEXIT_VMREAD:
 396             return VMEXIT_VMREAD_STR;
 397         case VMEXIT_VMRESUME:
 398             return VMEXIT_VMRESUME_STR;
 399         case VMEXIT_VMWRITE:
 400             return VMEXIT_VMWRITE_STR;
 401         case VMEXIT_VMXOFF:
 402             return VMEXIT_VMXOFF_STR;
 403         case VMEXIT_VMXON:
 404             return VMEXIT_VMXON_STR;
 405         case VMEXIT_CR_REG_ACCESSES:
 406             return VMEXIT_CR_REG_ACCESSES_STR;
 407         case VMEXIT_MOV_DR:
 408             return VMEXIT_MOV_DR_STR;
 409         case VMEXIT_IO_INSTR:
 410             return VMEXIT_IO_INSTR_STR;
 411         case VMEXIT_RDMSR:
 412             return VMEXIT_RDMSR_STR;
 413         case VMEXIT_WRMSR:
 414             return VMEXIT_WRMSR_STR;
 415         case VMEXIT_INVALID_GUEST_STATE:
 416             return VMEXIT_INVALID_GUEST_STATE_STR;
 417         case VMEXIT_INVALID_MSR_LOAD:
 418             return VMEXIT_INVALID_MSR_LOAD_STR;
 419         case VMEXIT_MWAIT:
 420             return VMEXIT_MWAIT_STR;
 421         case VMEXIT_MONITOR:
 422             return VMEXIT_MONITOR_STR;
 423         case VMEXIT_PAUSE:
 424             return VMEXIT_PAUSE_STR;
 425         case VMEXIT_INVALID_MACHINE_CHECK:
 426             return VMEXIT_INVALID_MACHINE_CHECK_STR;
 427         case VMEXIT_TPR_BELOW_THRESHOLD:
 428             return VMEXIT_TPR_BELOW_THRESHOLD_STR;
 429         case VMEXIT_APIC:
 430             return VMEXIT_APIC_STR;
 431         case VMEXIT_GDTR_IDTR:
 432             return VMEXIT_GDTR_IDTR_STR;
 433         case VMEXIT_LDTR_TR:
 434             return VMEXIT_LDTR_TR_STR;
 435         case VMEXIT_EPT_VIOLATION:
 436             return VMEXIT_EPT_VIOLATION_STR;
 437         case VMEXIT_EPT_CONFIG:
 438             return VMEXIT_EPT_CONFIG_STR;
 439         case VMEXIT_INVEPT:
 440             return VMEXIT_INVEPT_STR;
 441         case VMEXIT_RDTSCP:
 442             return VMEXIT_RDTSCP_STR;
 443         case VMEXIT_EXPIRED_PREEMPT_TIMER:
 444             return VMEXIT_EXPIRED_PREEMPT_TIMER_STR;
 445         case VMEXIT_INVVPID:
 446             return VMEXIT_INVVPID_STR;
 447         case VMEXIT_WBINVD:
 448             return VMEXIT_WBINVD_STR;
 449         case VMEXIT_XSETBV:
 450             return VMEXIT_XSETBV_STR;
 451     }
 452     return NULL;
 453 }
 454