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