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 #ifdef CONFIG_TELEMETRY
  36 #include <palacios/vmm_telemetry.h>
  37 #endif
  38
  39
  40
  41 /* At this point the GPRs are already copied into the guest_info state */
  42 int v3_handle_vmx_exit(struct guest_info * info, struct vmx_exit_info * exit_info) {
  43     struct vmx_data * vmx_info = (struct vmx_data *)(info->vmm_data);
  44
  45     /*
  46       PrintError("Handling VMEXIT: %s (%u), %lu (0x%lx)\n",
  47       v3_vmx_exit_code_to_str(exit_info->exit_reason),
  48       exit_info->exit_reason,
  49       exit_info->exit_qual, exit_info->exit_qual);
  50
  51       v3_print_vmcs();
  52     */
  53 #ifdef CONFIG_VNET_PROFILE
  54     uint64_t start, end;
  55     rdtscll(start);
  56 #endif
  57
  58 #ifdef CONFIG_TELEMETRY
  59     if (info->vm_info->enable_telemetry) {
  60         v3_telemetry_start_exit(info);
  61     }
  62 #endif
  63
  64     switch (exit_info->exit_reason) {
  65         case VMEXIT_INFO_EXCEPTION_OR_NMI: {
  66             pf_error_t error_code = *(pf_error_t *)&(exit_info->int_err);
  67
  68
  69             // JRL: Change "0x0e" to a macro value
  70             if ((uint8_t)exit_info->int_info == 0x0e) {
  71 #ifdef CONFIG_DEBUG_SHADOW_PAGING
  72                 PrintDebug("Page Fault at %p error_code=%x\n", (void *)exit_info->exit_qual, *(uint32_t *)&error_code);
  73 #endif
  74
  75                 if (info->shdw_pg_mode == SHADOW_PAGING) {
  76                     if (v3_handle_shadow_pagefault(info, (addr_t)exit_info->exit_qual, error_code) == -1) {
  77                         PrintError("Error handling shadow page fault\n");
  78                         return -1;
  79                     }
  80                 } else {
  81                     PrintError("Page fault in unimplemented paging mode\n");
  82                     return -1;
  83                 }
  84             } else {
  85                 PrintError("Unknown exception: 0x%x\n", (uint8_t)exit_info->int_info);
  86                 v3_print_GPRs(info);
  87                 return -1;
  88             }
  89             break;
  90         }
  91
  92         case VMEXIT_INVLPG:
  93             if (info->shdw_pg_mode == SHADOW_PAGING) {
  94                 if (v3_handle_shadow_invlpg(info) == -1) {
  95                     PrintError("Error handling INVLPG\n");
  96                     return -1;
  97                 }
  98             }
  99
 100             break;
 101         case VMEXIT_CPUID:
 102             if (v3_handle_cpuid(info) == -1) {
 103                 PrintError("Error Handling CPUID instruction\n");
 104                 return -1;
 105             }
 106
 107             break;
 108         case VMEXIT_RDMSR:
 109             if (v3_handle_msr_read(info) == -1) {
 110                 PrintError("Error handling MSR Read\n");
 111                 return -1;
 112             }
 113
 114             break;
 115         case VMEXIT_WRMSR:
 116             if (v3_handle_msr_write(info) == -1) {
 117                 PrintError("Error handling MSR Write\n");
 118                 return -1;
 119             }
 120
 121             break;
 122         case VMEXIT_VMCALL:
 123             /*
 124              * Hypercall
 125              */
 126
 127             // VMCALL is a 3 byte op
 128             // We do this early because some hypercalls can change the rip...
 129             info->rip += 3;
 130
 131             if (v3_handle_hypercall(info) == -1) {
 132                 return -1;
 133             }
 134             break;
 135         case VMEXIT_IO_INSTR: {
 136             struct vmx_exit_io_qual * io_qual = (struct vmx_exit_io_qual *)&(exit_info->exit_qual);
 137
 138             if (io_qual->dir == 0) {
 139                 if (io_qual->string) {
 140                     if (v3_handle_vmx_io_outs(info, exit_info) == -1) {
 141                         PrintError("Error in outs IO handler\n");
 142                         return -1;
 143                     }
 144                 } else {
 145                     if (v3_handle_vmx_io_out(info, exit_info) == -1) {
 146                         PrintError("Error in out IO handler\n");
 147                         return -1;
 148                     }
 149                 }
 150             } else {
 151                 if (io_qual->string) {
 152                     if(v3_handle_vmx_io_ins(info, exit_info) == -1) {
 153                         PrintError("Error in ins IO handler\n");
 154                         return -1;
 155                     }
 156                 } else {
 157                     if (v3_handle_vmx_io_in(info, exit_info) == -1) {
 158                         PrintError("Error in in IO handler\n");
 159                         return -1;
 160                     }
 161                 }
 162             }
 163             break;
 164         }
 165         case VMEXIT_CR_REG_ACCESSES: {
 166             struct vmx_exit_cr_qual * cr_qual = (struct vmx_exit_cr_qual *)&(exit_info->exit_qual);
 167
 168             // PrintDebug("Control register: %d\n", cr_qual->access_type);
 169             switch(cr_qual->cr_id) {
 170                 case 0:
 171                     //PrintDebug("Handling CR0 Access\n");
 172                     if (v3_vmx_handle_cr0_access(info, cr_qual, exit_info) == -1) {
 173                         PrintError("Error in CR0 access handler\n");
 174                         return -1;
 175                     }
 176                     break;
 177                 case 3:
 178                     //PrintDebug("Handling CR3 Access\n");
 179                     if (v3_vmx_handle_cr3_access(info, cr_qual) == -1) {
 180                         PrintError("Error in CR3 access handler\n");
 181                         return -1;
 182                     }
 183                     break;
 184                 default:
 185                     PrintError("Unhandled CR access: %d\n", cr_qual->cr_id);
 186                     return -1;
 187             }
 188
 189             info->rip += exit_info->instr_len;
 190
 191             break;
 192         }
 193         case VMEXIT_HLT:
 194             PrintDebug("Guest halted\n");
 195
 196             if (v3_handle_halt(info) == -1) {
 197                 PrintError("Error handling halt instruction\n");
 198                 return -1;
 199             }
 200
 201             break;
 202         case VMEXIT_PAUSE:
 203             // Handled as NOP
 204             info->rip += 2;
 205
 206             break;
 207         case VMEXIT_EXTERNAL_INTR:
 208             // Interrupts are handled outside switch
 209             break;
 210         case VMEXIT_INTR_WINDOW:
 211
 212             vmcs_read(VMCS_PROC_CTRLS, &(vmx_info->pri_proc_ctrls.value));
 213             vmx_info->pri_proc_ctrls.int_wndw_exit = 0;
 214             vmcs_write(VMCS_PROC_CTRLS, vmx_info->pri_proc_ctrls.value);
 215
 216 #ifdef CONFIG_DEBUG_INTERRUPTS
 217             PrintDebug("Interrupts available again! (RIP=%llx)\n", info->rip);
 218 #endif
 219
 220             break;
 221         default:
 222             PrintError("Unhandled VMEXIT: %s (%u), %lu (0x%lx)\n",
 223                        v3_vmx_exit_code_to_str(exit_info->exit_reason),
 224                        exit_info->exit_reason,
 225                        exit_info->exit_qual, exit_info->exit_qual);
 226             return -1;
 227     }
 228
 229 #ifdef CONFIG_TELEMETRY
 230     if (info->vm_info->enable_telemetry) {
 231         v3_telemetry_end_exit(info, exit_info->exit_reason);
 232     }
 233 #endif
 234
 235 #ifdef CONFIG_VNET_PROFILE
 236     rdtscll(end);
 237     info->vnet_times.total_exit_time = end - start;
 238     if(info->vnet_times.print)
 239         PrintError("Vnet_profiling: total_exit_time: %ld, total_handle_time: %ld memcpy_time: %ld  copy_from_guest: %ld copy_to_guest: %ld malloc_free: %ld, route_lookup: %ld\n",
 240                     (long)info->vnet_times.total_exit_time,
 241                          (long)info->vnet_times.total_handle_time,
 242                          (long)info->vnet_times.memcpy_time,
 243                          (long)info->vnet_times.time_copy_from_guest,
 244                          (long)info->vnet_times.time_copy_to_guest,
 245                          (long)info->vnet_times.time_mallocfree,
 246                          (long)info->vnet_times.time_route_lookup);
 247
 248     info->vnet_times.print = false;
 249 #endif
 250
 251
 252     return 0;
 253 }
 254
 255 static const char VMEXIT_INFO_EXCEPTION_OR_NMI_STR[] = "VMEXIT_INFO_EXCEPTION_OR_NMI";
 256 static const char VMEXIT_EXTERNAL_INTR_STR[] = "VMEXIT_EXTERNAL_INTR";
 257 static const char VMEXIT_TRIPLE_FAULT_STR[] = "VMEXIT_TRIPLE_FAULT";
 258 static const char VMEXIT_INIT_SIGNAL_STR[] = "VMEXIT_INIT_SIGNAL";
 259 static const char VMEXIT_STARTUP_IPI_STR[] = "VMEXIT_STARTUP_IPI";
 260 static const char VMEXIT_IO_SMI_STR[] = "VMEXIT_IO_SMI";
 261 static const char VMEXIT_OTHER_SMI_STR[] = "VMEXIT_OTHER_SMI";
 262 static const char VMEXIT_INTR_WINDOW_STR[] = "VMEXIT_INTR_WINDOW";
 263 static const char VMEXIT_NMI_WINDOW_STR[] = "VMEXIT_NMI_WINDOW";
 264 static const char VMEXIT_TASK_SWITCH_STR[] = "VMEXIT_TASK_SWITCH";
 265 static const char VMEXIT_CPUID_STR[] = "VMEXIT_CPUID";
 266 static const char VMEXIT_HLT_STR[] = "VMEXIT_HLT";
 267 static const char VMEXIT_INVD_STR[] = "VMEXIT_INVD";
 268 static const char VMEXIT_INVLPG_STR[] = "VMEXIT_INVLPG";
 269 static const char VMEXIT_RDPMC_STR[] = "VMEXIT_RDPMC";
 270 static const char VMEXIT_RDTSC_STR[] = "VMEXIT_RDTSC";
 271 static const char VMEXIT_RSM_STR[] = "VMEXIT_RSM";
 272 static const char VMEXIT_VMCALL_STR[] = "VMEXIT_VMCALL";
 273 static const char VMEXIT_VMCLEAR_STR[] = "VMEXIT_VMCLEAR";
 274 static const char VMEXIT_VMLAUNCH_STR[] = "VMEXIT_VMLAUNCH";
 275 static const char VMEXIT_VMPTRLD_STR[] = "VMEXIT_VMPTRLD";
 276 static const char VMEXIT_VMPTRST_STR[] = "VMEXIT_VMPTRST";
 277 static const char VMEXIT_VMREAD_STR[] = "VMEXIT_VMREAD";
 278 static const char VMEXIT_VMRESUME_STR[] = "VMEXIT_VMRESUME";
 279 static const char VMEXIT_VMWRITE_STR[] = "VMEXIT_VMWRITE";
 280 static const char VMEXIT_VMXOFF_STR[] = "VMEXIT_VMXOFF";
 281 static const char VMEXIT_VMXON_STR[] = "VMEXIT_VMXON";
 282 static const char VMEXIT_CR_REG_ACCESSES_STR[] = "VMEXIT_CR_REG_ACCESSES";
 283 static const char VMEXIT_MOV_DR_STR[] = "VMEXIT_MOV_DR";
 284 static const char VMEXIT_IO_INSTR_STR[] = "VMEXIT_IO_INSTR";
 285 static const char VMEXIT_RDMSR_STR[] = "VMEXIT_RDMSR";
 286 static const char VMEXIT_WRMSR_STR[] = "VMEXIT_WRMSR";
 287 static const char VMEXIT_ENTRY_FAIL_INVALID_GUEST_STATE_STR[] = "VMEXIT_ENTRY_FAIL_INVALID_GUEST_STATE";
 288 static const char VMEXIT_ENTRY_FAIL_MSR_LOAD_STR[] = "VMEXIT_ENTRY_FAIL_MSR_LOAD";
 289 static const char VMEXIT_MWAIT_STR[] = "VMEXIT_MWAIT";
 290 static const char VMEXIT_MONITOR_STR[] = "VMEXIT_MONITOR";
 291 static const char VMEXIT_PAUSE_STR[] = "VMEXIT_PAUSE";
 292 static const char VMEXIT_ENTRY_FAILURE_MACHINE_CHECK_STR[] = "VMEXIT_ENTRY_FAILURE_MACHINE_CHECK";
 293 static const char VMEXIT_TPR_BELOW_THRESHOLD_STR[] = "VMEXIT_TPR_BELOW_THRESHOLD";
 294 static const char VMEXIT_APIC_STR[] = "VMEXIT_APIC";
 295 static const char VMEXIT_GDTR_IDTR_STR[] = "VMEXIT_GDTR_IDTR";
 296 static const char VMEXIT_LDTR_TR_STR[] = "VMEXIT_LDTR_TR";
 297 static const char VMEXIT_EPT_VIOLATION_STR[] = "VMEXIT_EPT_VIOLATION";
 298 static const char VMEXIT_EPT_CONFIG_STR[] = "VMEXIT_EPT_CONFIG";
 299 static const char VMEXIT_INVEPT_STR[] = "VMEXIT_INVEPT";
 300 static const char VMEXIT_RDTSCP_STR[] = "VMEXIT_RDTSCP";
 301 static const char VMEXIT_EXPIRED_PREEMPT_TIMER_STR[] = "VMEXIT_EXPIRED_PREEMPT_TIMER";
 302 static const char VMEXIT_INVVPID_STR[] = "VMEXIT_INVVPID";
 303 static const char VMEXIT_WBINVD_STR[] = "VMEXIT_WBINVD";
 304 static const char VMEXIT_XSETBV_STR[] = "VMEXIT_XSETBV";
 305
 306 const char * v3_vmx_exit_code_to_str(vmx_exit_t exit)
 307 {
 308     switch(exit) {
 309         case VMEXIT_INFO_EXCEPTION_OR_NMI:
 310             return VMEXIT_INFO_EXCEPTION_OR_NMI_STR;
 311         case VMEXIT_EXTERNAL_INTR:
 312             return VMEXIT_EXTERNAL_INTR_STR;
 313         case VMEXIT_TRIPLE_FAULT:
 314             return VMEXIT_TRIPLE_FAULT_STR;
 315         case VMEXIT_INIT_SIGNAL:
 316             return VMEXIT_INIT_SIGNAL_STR;
 317         case VMEXIT_STARTUP_IPI:
 318             return VMEXIT_STARTUP_IPI_STR;
 319         case VMEXIT_IO_SMI:
 320             return VMEXIT_IO_SMI_STR;
 321         case VMEXIT_OTHER_SMI:
 322             return VMEXIT_OTHER_SMI_STR;
 323         case VMEXIT_INTR_WINDOW:
 324             return VMEXIT_INTR_WINDOW_STR;
 325         case VMEXIT_NMI_WINDOW:
 326             return VMEXIT_NMI_WINDOW_STR;
 327         case VMEXIT_TASK_SWITCH:
 328             return VMEXIT_TASK_SWITCH_STR;
 329         case VMEXIT_CPUID:
 330             return VMEXIT_CPUID_STR;
 331         case VMEXIT_HLT:
 332             return VMEXIT_HLT_STR;
 333         case VMEXIT_INVD:
 334             return VMEXIT_INVD_STR;
 335         case VMEXIT_INVLPG:
 336             return VMEXIT_INVLPG_STR;
 337         case VMEXIT_RDPMC:
 338             return VMEXIT_RDPMC_STR;
 339         case VMEXIT_RDTSC:
 340             return VMEXIT_RDTSC_STR;
 341         case VMEXIT_RSM:
 342             return VMEXIT_RSM_STR;
 343         case VMEXIT_VMCALL:
 344             return VMEXIT_VMCALL_STR;
 345         case VMEXIT_VMCLEAR:
 346             return VMEXIT_VMCLEAR_STR;
 347         case VMEXIT_VMLAUNCH:
 348             return VMEXIT_VMLAUNCH_STR;
 349         case VMEXIT_VMPTRLD:
 350             return VMEXIT_VMPTRLD_STR;
 351         case VMEXIT_VMPTRST:
 352             return VMEXIT_VMPTRST_STR;
 353         case VMEXIT_VMREAD:
 354             return VMEXIT_VMREAD_STR;
 355         case VMEXIT_VMRESUME:
 356             return VMEXIT_VMRESUME_STR;
 357         case VMEXIT_VMWRITE:
 358             return VMEXIT_VMWRITE_STR;
 359         case VMEXIT_VMXOFF:
 360             return VMEXIT_VMXOFF_STR;
 361         case VMEXIT_VMXON:
 362             return VMEXIT_VMXON_STR;
 363         case VMEXIT_CR_REG_ACCESSES:
 364             return VMEXIT_CR_REG_ACCESSES_STR;
 365         case VMEXIT_MOV_DR:
 366             return VMEXIT_MOV_DR_STR;
 367         case VMEXIT_IO_INSTR:
 368             return VMEXIT_IO_INSTR_STR;
 369         case VMEXIT_RDMSR:
 370             return VMEXIT_RDMSR_STR;
 371         case VMEXIT_WRMSR:
 372             return VMEXIT_WRMSR_STR;
 373         case VMEXIT_ENTRY_FAIL_INVALID_GUEST_STATE:
 374             return VMEXIT_ENTRY_FAIL_INVALID_GUEST_STATE_STR;
 375         case VMEXIT_ENTRY_FAIL_MSR_LOAD:
 376             return VMEXIT_ENTRY_FAIL_MSR_LOAD_STR;
 377         case VMEXIT_MWAIT:
 378             return VMEXIT_MWAIT_STR;
 379         case VMEXIT_MONITOR:
 380             return VMEXIT_MONITOR_STR;
 381         case VMEXIT_PAUSE:
 382             return VMEXIT_PAUSE_STR;
 383         case VMEXIT_ENTRY_FAILURE_MACHINE_CHECK:
 384             return VMEXIT_ENTRY_FAILURE_MACHINE_CHECK_STR;
 385         case VMEXIT_TPR_BELOW_THRESHOLD:
 386             return VMEXIT_TPR_BELOW_THRESHOLD_STR;
 387         case VMEXIT_APIC:
 388             return VMEXIT_APIC_STR;
 389         case VMEXIT_GDTR_IDTR:
 390             return VMEXIT_GDTR_IDTR_STR;
 391         case VMEXIT_LDTR_TR:
 392             return VMEXIT_LDTR_TR_STR;
 393         case VMEXIT_EPT_VIOLATION:
 394             return VMEXIT_EPT_VIOLATION_STR;
 395         case VMEXIT_EPT_CONFIG:
 396             return VMEXIT_EPT_CONFIG_STR;
 397         case VMEXIT_INVEPT:
 398             return VMEXIT_INVEPT_STR;
 399         case VMEXIT_RDTSCP:
 400             return VMEXIT_RDTSCP_STR;
 401         case VMEXIT_EXPIRED_PREEMPT_TIMER:
 402             return VMEXIT_EXPIRED_PREEMPT_TIMER_STR;
 403         case VMEXIT_INVVPID:
 404             return VMEXIT_INVVPID_STR;
 405         case VMEXIT_WBINVD:
 406             return VMEXIT_WBINVD_STR;
 407         case VMEXIT_XSETBV:
 408             return VMEXIT_XSETBV_STR;
 409     }
 410     return NULL;
 411 }
 412