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