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
  35 #ifndef CONFIG_DEBUG_VMX
  36 #undef PrintDebug
  37 #define PrintDebug(fmt, args...)
  38 #endif
  39
  40 #ifdef CONFIG_TELEMETRY
  41 #include <palacios/vmm_telemetry.h>
  42 #endif
  43
  44 /* At this point the GPRs are already copied into the guest_info state */
  45 int v3_handle_atomic_vmx_exit(struct guest_info * info, struct vmx_exit_info * exit_info) {
  46     struct vmx_data * vmx_info = (struct vmx_data *)(info->vmm_data);
  47
  48     switch (exit_info->exit_reason) {
  49         case VMEXIT_INTR_WINDOW:
  50             // This is here because we touch the VMCS
  51             vmcs_read(VMCS_PROC_CTRLS, &(vmx_info->pri_proc_ctrls.value));
  52             vmx_info->pri_proc_ctrls.int_wndw_exit = 0;
  53             vmcs_write(VMCS_PROC_CTRLS, vmx_info->pri_proc_ctrls.value);
  54
  55 #ifdef CONFIG_DEBUG_INTERRUPTS
  56             PrintDebug("Interrupts available again! (RIP=%llx)\n", info->rip);
  57 #endif
  58             break;
  59     }
  60     return 0;
  61 }
  62
  63 /* At this point the GPRs are already copied into the guest_info state */
  64 int v3_handle_vmx_exit(struct guest_info * info, struct vmx_exit_info * exit_info) {
  65     /*
  66       PrintError("Handling VMEXIT: %s (%u), %lu (0x%lx)\n",
  67       v3_vmx_exit_code_to_str(exit_info->exit_reason),
  68       exit_info->exit_reason,
  69       exit_info->exit_qual, exit_info->exit_qual);
  70
  71       v3_print_vmcs();
  72     */
  73
  74 #ifdef CONFIG_TELEMETRY
  75     if (info->vm_info->enable_telemetry) {
  76         v3_telemetry_start_exit(info);
  77     }
  78 #endif
  79
  80     switch (exit_info->exit_reason) {
  81         case VMEXIT_INFO_EXCEPTION_OR_NMI: {
  82             pf_error_t error_code = *(pf_error_t *)&(exit_info->int_err);
  83
  84
  85             // JRL: Change "0x0e" to a macro value
  86             if ((uint8_t)exit_info->int_info == 0x0e) {
  87 #ifdef CONFIG_DEBUG_SHADOW_PAGING
  88                 PrintDebug("Page Fault at %p error_code=%x\n", (void *)exit_info->exit_qual, *(uint32_t *)&error_code);
  89 #endif
  90
  91                 if (info->shdw_pg_mode == SHADOW_PAGING) {
  92                     if (v3_handle_shadow_pagefault(info, (addr_t)exit_info->exit_qual, error_code) == -1) {
  93                         PrintError("Error handling shadow page fault\n");
  94                         return -1;
  95                     }
  96                 } else {
  97                     PrintError("Page fault in unimplemented paging mode\n");
  98                     return -1;
  99                 }
 100             } else {
 101                 PrintError("Unknown exception: 0x%x\n", (uint8_t)exit_info->int_info);
 102                 v3_print_GPRs(info);
 103                 return -1;
 104             }
 105             break;
 106         }
 107
 108         case VMEXIT_INVLPG:
 109             if (info->shdw_pg_mode == SHADOW_PAGING) {
 110                 if (v3_handle_shadow_invlpg(info) == -1) {
 111                     PrintError("Error handling INVLPG\n");
 112                     return -1;
 113                 }
 114             }
 115
 116             break;
 117
 118         case VMEXIT_RDTSC:
 119 #ifdef CONFIG_DEBUG_TIME
 120             PrintDebug("RDTSC\n");
 121 #endif
 122             if (v3_handle_rdtsc(info) == -1) {
 123                 PrintError("Error Handling RDTSC instruction\n");
 124                 return -1;
 125             }
 126
 127             break;
 128
 129         case VMEXIT_CPUID:
 130             if (v3_handle_cpuid(info) == -1) {
 131                 PrintError("Error Handling CPUID instruction\n");
 132                 return -1;
 133             }
 134
 135             break;
 136         case VMEXIT_RDMSR:
 137             if (v3_handle_msr_read(info) == -1) {
 138                 PrintError("Error handling MSR Read\n");
 139                 return -1;
 140             }
 141
 142             break;
 143         case VMEXIT_WRMSR:
 144             if (v3_handle_msr_write(info) == -1) {
 145                 PrintError("Error handling MSR Write\n");
 146                 return -1;
 147             }
 148
 149             break;
 150         case VMEXIT_VMCALL:
 151             /*
 152              * Hypercall
 153              */
 154
 155             // VMCALL is a 3 byte op
 156             // We do this early because some hypercalls can change the rip...
 157             info->rip += 3;
 158
 159             if (v3_handle_hypercall(info) == -1) {
 160                 return -1;
 161             }
 162             break;
 163         case VMEXIT_IO_INSTR: {
 164             struct vmx_exit_io_qual * io_qual = (struct vmx_exit_io_qual *)&(exit_info->exit_qual);
 165
 166             if (io_qual->dir == 0) {
 167                 if (io_qual->string) {
 168                     if (v3_handle_vmx_io_outs(info, exit_info) == -1) {
 169                         PrintError("Error in outs IO handler\n");
 170                         return -1;
 171                     }
 172                 } else {
 173                     if (v3_handle_vmx_io_out(info, exit_info) == -1) {
 174                         PrintError("Error in out IO handler\n");
 175                         return -1;
 176                     }
 177                 }
 178             } else {
 179                 if (io_qual->string) {
 180                     if(v3_handle_vmx_io_ins(info, exit_info) == -1) {
 181                         PrintError("Error in ins IO handler\n");
 182                         return -1;
 183                     }
 184                 } else {
 185                     if (v3_handle_vmx_io_in(info, exit_info) == -1) {
 186                         PrintError("Error in in IO handler\n");
 187                         return -1;
 188                     }
 189                 }
 190             }
 191             break;
 192         }
 193         case VMEXIT_CR_REG_ACCESSES: {
 194             struct vmx_exit_cr_qual * cr_qual = (struct vmx_exit_cr_qual *)&(exit_info->exit_qual);
 195
 196             // PrintDebug("Control register: %d\n", cr_qual->access_type);
 197             switch(cr_qual->cr_id) {
 198                 case 0:
 199                     //PrintDebug("Handling CR0 Access\n");
 200                     if (v3_vmx_handle_cr0_access(info, cr_qual, exit_info) == -1) {
 201                         PrintError("Error in CR0 access handler\n");
 202                         return -1;
 203                     }
 204                     break;
 205                 case 3:
 206                     //PrintDebug("Handling CR3 Access\n");
 207                     if (v3_vmx_handle_cr3_access(info, cr_qual) == -1) {
 208                         PrintError("Error in CR3 access handler\n");
 209                         return -1;
 210                     }
 211                     break;
 212                 default:
 213                     PrintError("Unhandled CR access: %d\n", cr_qual->cr_id);
 214                     return -1;
 215             }
 216
 217             info->rip += exit_info->instr_len;
 218
 219             break;
 220         }
 221         case VMEXIT_HLT:
 222             PrintDebug("Guest halted\n");
 223
 224             if (v3_handle_halt(info) == -1) {
 225                 PrintError("Error handling halt instruction\n");
 226                 return -1;
 227             }
 228
 229             break;
 230         case VMEXIT_PAUSE:
 231             // Handled as NOP
 232             info->rip += 2;
 233
 234             break;
 235         case VMEXIT_EXTERNAL_INTR:
 236             // Interrupts are handled outside switch
 237             break;
 238         case VMEXIT_INTR_WINDOW:
 239             // This is handled in the atomic part of the vmx code,
 240             // not in the generic (interruptable) vmx handler
 241             break;
 242         default:
 243             PrintError("Unhandled VMEXIT: %s (%u), %lu (0x%lx)\n",
 244                        v3_vmx_exit_code_to_str(exit_info->exit_reason),
 245                        exit_info->exit_reason,
 246                        exit_info->exit_qual, exit_info->exit_qual);
 247             return -1;
 248     }
 249
 250
 251 #ifdef CONFIG_TELEMETRY
 252     if (info->vm_info->enable_telemetry) {
 253         v3_telemetry_end_exit(info, exit_info->exit_reason);
 254     }
 255 #endif
 256
 257
 258     return 0;
 259 }
 260
 261 static const char VMEXIT_INFO_EXCEPTION_OR_NMI_STR[] = "VMEXIT_INFO_EXCEPTION_OR_NMI";
 262 static const char VMEXIT_EXTERNAL_INTR_STR[] = "VMEXIT_EXTERNAL_INTR";
 263 static const char VMEXIT_TRIPLE_FAULT_STR[] = "VMEXIT_TRIPLE_FAULT";
 264 static const char VMEXIT_INIT_SIGNAL_STR[] = "VMEXIT_INIT_SIGNAL";
 265 static const char VMEXIT_STARTUP_IPI_STR[] = "VMEXIT_STARTUP_IPI";
 266 static const char VMEXIT_IO_SMI_STR[] = "VMEXIT_IO_SMI";
 267 static const char VMEXIT_OTHER_SMI_STR[] = "VMEXIT_OTHER_SMI";
 268 static const char VMEXIT_INTR_WINDOW_STR[] = "VMEXIT_INTR_WINDOW";
 269 static const char VMEXIT_NMI_WINDOW_STR[] = "VMEXIT_NMI_WINDOW";
 270 static const char VMEXIT_TASK_SWITCH_STR[] = "VMEXIT_TASK_SWITCH";
 271 static const char VMEXIT_CPUID_STR[] = "VMEXIT_CPUID";
 272 static const char VMEXIT_HLT_STR[] = "VMEXIT_HLT";
 273 static const char VMEXIT_INVD_STR[] = "VMEXIT_INVD";
 274 static const char VMEXIT_INVLPG_STR[] = "VMEXIT_INVLPG";
 275 static const char VMEXIT_RDPMC_STR[] = "VMEXIT_RDPMC";
 276 static const char VMEXIT_RDTSC_STR[] = "VMEXIT_RDTSC";
 277 static const char VMEXIT_RSM_STR[] = "VMEXIT_RSM";
 278 static const char VMEXIT_VMCALL_STR[] = "VMEXIT_VMCALL";
 279 static const char VMEXIT_VMCLEAR_STR[] = "VMEXIT_VMCLEAR";
 280 static const char VMEXIT_VMLAUNCH_STR[] = "VMEXIT_VMLAUNCH";
 281 static const char VMEXIT_VMPTRLD_STR[] = "VMEXIT_VMPTRLD";
 282 static const char VMEXIT_VMPTRST_STR[] = "VMEXIT_VMPTRST";
 283 static const char VMEXIT_VMREAD_STR[] = "VMEXIT_VMREAD";
 284 static const char VMEXIT_VMRESUME_STR[] = "VMEXIT_VMRESUME";
 285 static const char VMEXIT_VMWRITE_STR[] = "VMEXIT_VMWRITE";
 286 static const char VMEXIT_VMXOFF_STR[] = "VMEXIT_VMXOFF";
 287 static const char VMEXIT_VMXON_STR[] = "VMEXIT_VMXON";
 288 static const char VMEXIT_CR_REG_ACCESSES_STR[] = "VMEXIT_CR_REG_ACCESSES";
 289 static const char VMEXIT_MOV_DR_STR[] = "VMEXIT_MOV_DR";
 290 static const char VMEXIT_IO_INSTR_STR[] = "VMEXIT_IO_INSTR";
 291 static const char VMEXIT_RDMSR_STR[] = "VMEXIT_RDMSR";
 292 static const char VMEXIT_WRMSR_STR[] = "VMEXIT_WRMSR";
 293 static const char VMEXIT_ENTRY_FAIL_INVALID_GUEST_STATE_STR[] = "VMEXIT_ENTRY_FAIL_INVALID_GUEST_STATE";
 294 static const char VMEXIT_ENTRY_FAIL_MSR_LOAD_STR[] = "VMEXIT_ENTRY_FAIL_MSR_LOAD";
 295 static const char VMEXIT_MWAIT_STR[] = "VMEXIT_MWAIT";
 296 static const char VMEXIT_MONITOR_STR[] = "VMEXIT_MONITOR";
 297 static const char VMEXIT_PAUSE_STR[] = "VMEXIT_PAUSE";
 298 static const char VMEXIT_ENTRY_FAILURE_MACHINE_CHECK_STR[] = "VMEXIT_ENTRY_FAILURE_MACHINE_CHECK";
 299 static const char VMEXIT_TPR_BELOW_THRESHOLD_STR[] = "VMEXIT_TPR_BELOW_THRESHOLD";
 300 static const char VMEXIT_APIC_STR[] = "VMEXIT_APIC";
 301 static const char VMEXIT_GDTR_IDTR_STR[] = "VMEXIT_GDTR_IDTR";
 302 static const char VMEXIT_LDTR_TR_STR[] = "VMEXIT_LDTR_TR";
 303 static const char VMEXIT_EPT_VIOLATION_STR[] = "VMEXIT_EPT_VIOLATION";
 304 static const char VMEXIT_EPT_CONFIG_STR[] = "VMEXIT_EPT_CONFIG";
 305 static const char VMEXIT_INVEPT_STR[] = "VMEXIT_INVEPT";
 306 static const char VMEXIT_RDTSCP_STR[] = "VMEXIT_RDTSCP";
 307 static const char VMEXIT_EXPIRED_PREEMPT_TIMER_STR[] = "VMEXIT_EXPIRED_PREEMPT_TIMER";
 308 static const char VMEXIT_INVVPID_STR[] = "VMEXIT_INVVPID";
 309 static const char VMEXIT_WBINVD_STR[] = "VMEXIT_WBINVD";
 310 static const char VMEXIT_XSETBV_STR[] = "VMEXIT_XSETBV";
 311
 312 const char * v3_vmx_exit_code_to_str(vmx_exit_t exit)
 313 {
 314     switch(exit) {
 315         case VMEXIT_INFO_EXCEPTION_OR_NMI:
 316             return VMEXIT_INFO_EXCEPTION_OR_NMI_STR;
 317         case VMEXIT_EXTERNAL_INTR:
 318             return VMEXIT_EXTERNAL_INTR_STR;
 319         case VMEXIT_TRIPLE_FAULT:
 320             return VMEXIT_TRIPLE_FAULT_STR;
 321         case VMEXIT_INIT_SIGNAL:
 322             return VMEXIT_INIT_SIGNAL_STR;
 323         case VMEXIT_STARTUP_IPI:
 324             return VMEXIT_STARTUP_IPI_STR;
 325         case VMEXIT_IO_SMI:
 326             return VMEXIT_IO_SMI_STR;
 327         case VMEXIT_OTHER_SMI:
 328             return VMEXIT_OTHER_SMI_STR;
 329         case VMEXIT_INTR_WINDOW:
 330             return VMEXIT_INTR_WINDOW_STR;
 331         case VMEXIT_NMI_WINDOW:
 332             return VMEXIT_NMI_WINDOW_STR;
 333         case VMEXIT_TASK_SWITCH:
 334             return VMEXIT_TASK_SWITCH_STR;
 335         case VMEXIT_CPUID:
 336             return VMEXIT_CPUID_STR;
 337         case VMEXIT_HLT:
 338             return VMEXIT_HLT_STR;
 339         case VMEXIT_INVD:
 340             return VMEXIT_INVD_STR;
 341         case VMEXIT_INVLPG:
 342             return VMEXIT_INVLPG_STR;
 343         case VMEXIT_RDPMC:
 344             return VMEXIT_RDPMC_STR;
 345         case VMEXIT_RDTSC:
 346             return VMEXIT_RDTSC_STR;
 347         case VMEXIT_RSM:
 348             return VMEXIT_RSM_STR;
 349         case VMEXIT_VMCALL:
 350             return VMEXIT_VMCALL_STR;
 351         case VMEXIT_VMCLEAR:
 352             return VMEXIT_VMCLEAR_STR;
 353         case VMEXIT_VMLAUNCH:
 354             return VMEXIT_VMLAUNCH_STR;
 355         case VMEXIT_VMPTRLD:
 356             return VMEXIT_VMPTRLD_STR;
 357         case VMEXIT_VMPTRST:
 358             return VMEXIT_VMPTRST_STR;
 359         case VMEXIT_VMREAD:
 360             return VMEXIT_VMREAD_STR;
 361         case VMEXIT_VMRESUME:
 362             return VMEXIT_VMRESUME_STR;
 363         case VMEXIT_VMWRITE:
 364             return VMEXIT_VMWRITE_STR;
 365         case VMEXIT_VMXOFF:
 366             return VMEXIT_VMXOFF_STR;
 367         case VMEXIT_VMXON:
 368             return VMEXIT_VMXON_STR;
 369         case VMEXIT_CR_REG_ACCESSES:
 370             return VMEXIT_CR_REG_ACCESSES_STR;
 371         case VMEXIT_MOV_DR:
 372             return VMEXIT_MOV_DR_STR;
 373         case VMEXIT_IO_INSTR:
 374             return VMEXIT_IO_INSTR_STR;
 375         case VMEXIT_RDMSR:
 376             return VMEXIT_RDMSR_STR;
 377         case VMEXIT_WRMSR:
 378             return VMEXIT_WRMSR_STR;
 379         case VMEXIT_ENTRY_FAIL_INVALID_GUEST_STATE:
 380             return VMEXIT_ENTRY_FAIL_INVALID_GUEST_STATE_STR;
 381         case VMEXIT_ENTRY_FAIL_MSR_LOAD:
 382             return VMEXIT_ENTRY_FAIL_MSR_LOAD_STR;
 383         case VMEXIT_MWAIT:
 384             return VMEXIT_MWAIT_STR;
 385         case VMEXIT_MONITOR:
 386             return VMEXIT_MONITOR_STR;
 387         case VMEXIT_PAUSE:
 388             return VMEXIT_PAUSE_STR;
 389         case VMEXIT_ENTRY_FAILURE_MACHINE_CHECK:
 390             return VMEXIT_ENTRY_FAILURE_MACHINE_CHECK_STR;
 391         case VMEXIT_TPR_BELOW_THRESHOLD:
 392             return VMEXIT_TPR_BELOW_THRESHOLD_STR;
 393         case VMEXIT_APIC:
 394             return VMEXIT_APIC_STR;
 395         case VMEXIT_GDTR_IDTR:
 396             return VMEXIT_GDTR_IDTR_STR;
 397         case VMEXIT_LDTR_TR:
 398             return VMEXIT_LDTR_TR_STR;
 399         case VMEXIT_EPT_VIOLATION:
 400             return VMEXIT_EPT_VIOLATION_STR;
 401         case VMEXIT_EPT_CONFIG:
 402             return VMEXIT_EPT_CONFIG_STR;
 403         case VMEXIT_INVEPT:
 404             return VMEXIT_INVEPT_STR;
 405         case VMEXIT_RDTSCP:
 406             return VMEXIT_RDTSCP_STR;
 407         case VMEXIT_EXPIRED_PREEMPT_TIMER:
 408             return VMEXIT_EXPIRED_PREEMPT_TIMER_STR;
 409         case VMEXIT_INVVPID:
 410             return VMEXIT_INVVPID_STR;
 411         case VMEXIT_WBINVD:
 412             return VMEXIT_WBINVD_STR;
 413         case VMEXIT_XSETBV:
 414             return VMEXIT_XSETBV_STR;
 415     }
 416     return NULL;
 417 }
 418