1 #include <stdio.h> 2 #include <string.h> 3 #include <signal.h> 4 #include <stdint.h> 5 #include <unistd.h> 6 #include <inttypes.h> 7 #include <stdlib.h> 8 #include <termios.h> 9 #include <sys/utsname.h> 10 #include <sys/types.h> 11 #include <sys/stat.h> 12 #include <ctype.h> 13 14 /* user defined header files */ 15 #include <linux/types.h> 16 #include <kvm/kvm.h> 17 #include <kvm/kvm-cpu.h> 18 #include <kvm/8250-serial.h> 19 #include <kvm/virtio-blk.h> 20 #include <kvm/virtio-net.h> 21 #include <kvm/virtio-console.h> 22 #include <kvm/virtio-rng.h> 23 #include <kvm/disk-image.h> 24 #include <kvm/util.h> 25 #include <kvm/pci.h> 26 #include <kvm/rtc.h> 27 #include <kvm/term.h> 28 #include <kvm/ioport.h> 29 #include <kvm/threadpool.h> 30 31 /* header files for gitish interface */ 32 #include <kvm/kvm-run.h> 33 #include <kvm/parse-options.h> 34 35 #define DEFAULT_KVM_DEV "/dev/kvm" 36 #define DEFAULT_CONSOLE "serial" 37 #define DEFAULT_NETWORK "virtio" 38 #define DEFAULT_HOST_ADDR "192.168.33.2" 39 #define DEFAULT_GUEST_MAC "00:11:22:33:44:55" 40 #define DEFAULT_SCRIPT "none" 41 42 #define MB_SHIFT (20) 43 #define MIN_RAM_SIZE_MB (64ULL) 44 #define MIN_RAM_SIZE_BYTE (MIN_RAM_SIZE_MB << MB_SHIFT) 45 #define MAX_DISK_IMAGES 4 46 47 static struct kvm *kvm; 48 static struct kvm_cpu *kvm_cpus[KVM_NR_CPUS]; 49 static __thread struct kvm_cpu *current_kvm_cpu; 50 51 static u64 ram_size = MIN_RAM_SIZE_MB; 52 static u8 image_count; 53 static const char *kernel_cmdline; 54 static const char *kernel_filename; 55 static const char *initrd_filename; 56 static const char *image_filename[MAX_DISK_IMAGES]; 57 static const char *console; 58 static const char *kvm_dev; 59 static const char *network; 60 static const char *host_ip_addr; 61 static const char *guest_mac; 62 static const char *script; 63 static bool single_step; 64 static bool readonly_image[MAX_DISK_IMAGES]; 65 static bool virtio_rng; 66 extern bool ioport_debug; 67 extern int active_console; 68 69 static int nrcpus = 1; 70 71 static const char * const run_usage[] = { 72 "kvm run [<options>] [<kernel image>]", 73 NULL 74 }; 75 76 static int img_name_parser(const struct option *opt, const char *arg, int unset) 77 { 78 char *sep; 79 80 if (image_count >= MAX_DISK_IMAGES) 81 die("Currently only 4 images are supported"); 82 83 image_filename[image_count] = arg; 84 sep = strstr(arg, ","); 85 if (sep) { 86 if (strcmp(sep + 1, "ro") == 0) 87 readonly_image[image_count] = 1; 88 *sep = 0; 89 } 90 91 image_count++; 92 93 return 0; 94 } 95 96 static const struct option options[] = { 97 OPT_GROUP("Basic options:"), 98 OPT_INTEGER('\0', "cpus", &nrcpus, "Number of CPUs"), 99 OPT_U64('m', "mem", &ram_size, "Virtual machine memory size in MiB."), 100 OPT_CALLBACK('i', "image", NULL, "image", "Disk image", img_name_parser), 101 OPT_STRING('c', "console", &console, "serial or virtio", 102 "Console to use"), 103 OPT_BOOLEAN('\0', "virtio-rng", &virtio_rng, 104 "Enable virtio Random Number Generator"), 105 106 OPT_GROUP("Kernel options:"), 107 OPT_STRING('k', "kernel", &kernel_filename, "kernel", 108 "Kernel to boot in virtual machine"), 109 OPT_STRING('r', "initrd", &initrd_filename, "initrd", 110 "Initial RAM disk image"), 111 OPT_STRING('p', "params", &kernel_cmdline, "params", 112 "Kernel command line arguments"), 113 114 OPT_GROUP("Networking options:"), 115 OPT_STRING('n', "network", &network, "virtio", 116 "Network to use"), 117 OPT_STRING('\0', "host-ip-addr", &host_ip_addr, "a.b.c.d", 118 "Assign this address to the host side networking"), 119 OPT_STRING('\0', "guest-mac", &guest_mac, "aa:bb:cc:dd:ee:ff", 120 "Assign this address to the guest side NIC"), 121 OPT_STRING('\0', "tapscript", &script, "Script path", 122 "Assign a script to process created tap device"), 123 OPT_GROUP("Debug options:"), 124 OPT_STRING('d', "kvm-dev", &kvm_dev, "kvm-dev", "KVM device file"), 125 OPT_BOOLEAN('s', "single-step", &single_step, 126 "Enable single stepping"), 127 OPT_BOOLEAN('g', "ioport-debug", &ioport_debug, 128 "Enable ioport debugging"), 129 OPT_END() 130 }; 131 132 static void handle_sigquit(int sig) 133 { 134 int i; 135 136 for (i = 0; i < nrcpus; i++) { 137 struct kvm_cpu *cpu = kvm_cpus[i]; 138 139 kvm_cpu__show_registers(cpu); 140 kvm_cpu__show_code(cpu); 141 kvm_cpu__show_page_tables(cpu); 142 } 143 144 serial8250__inject_sysrq(kvm); 145 } 146 147 static void handle_sigalrm(int sig) 148 { 149 serial8250__inject_interrupt(kvm); 150 virtio_console__inject_interrupt(kvm); 151 } 152 153 static void *kvm_cpu_thread(void *arg) 154 { 155 current_kvm_cpu = arg; 156 157 if (kvm_cpu__start(current_kvm_cpu)) 158 goto panic_kvm; 159 160 kvm_cpu__delete(current_kvm_cpu); 161 162 return (void *) (intptr_t) 0; 163 164 panic_kvm: 165 fprintf(stderr, "KVM exit reason: %" PRIu32 " (\"%s\")\n", 166 current_kvm_cpu->kvm_run->exit_reason, 167 kvm_exit_reasons[current_kvm_cpu->kvm_run->exit_reason]); 168 if (current_kvm_cpu->kvm_run->exit_reason == KVM_EXIT_UNKNOWN) 169 fprintf(stderr, "KVM exit code: 0x%Lu\n", 170 current_kvm_cpu->kvm_run->hw.hardware_exit_reason); 171 172 kvm_cpu__show_registers(current_kvm_cpu); 173 kvm_cpu__show_code(current_kvm_cpu); 174 kvm_cpu__show_page_tables(current_kvm_cpu); 175 176 kvm_cpu__delete(current_kvm_cpu); 177 178 return (void *) (intptr_t) 1; 179 } 180 181 static char kernel[PATH_MAX]; 182 const char *host_kernels[] = { 183 "/boot/vmlinuz", 184 "/boot/bzImage", 185 NULL 186 }; 187 const char *default_kernels[] = { 188 "./bzImage", 189 "../../arch/x86/boot/bzImage", 190 NULL 191 }; 192 193 static void kernel_usage_with_options(void) 194 { 195 const char **k; 196 struct utsname uts; 197 198 fprintf(stderr, "Fatal: could not find default kernel image in:\n"); 199 k = &default_kernels[0]; 200 while (*k) { 201 fprintf(stderr, "\t%s\n", *k); 202 k++; 203 } 204 205 if (uname(&uts) < 0) 206 return; 207 208 k = &host_kernels[0]; 209 while (*k) { 210 if (snprintf(kernel, PATH_MAX, "%s-%s", *k, uts.release) < 0) 211 return; 212 fprintf(stderr, "\t%s\n", kernel); 213 k++; 214 } 215 fprintf(stderr, "\nPlease see 'kvm run --help' for more options.\n\n"); 216 } 217 218 static const char *find_kernel(void) 219 { 220 const char **k; 221 struct stat st; 222 struct utsname uts; 223 224 k = &default_kernels[0]; 225 while (*k) { 226 if (stat(*k, &st) < 0 || !S_ISREG(st.st_mode)) { 227 k++; 228 continue; 229 } 230 strncpy(kernel, *k, PATH_MAX); 231 return kernel; 232 } 233 234 if (uname(&uts) < 0) 235 return NULL; 236 237 k = &host_kernels[0]; 238 while (*k) { 239 if (snprintf(kernel, PATH_MAX, "%s-%s", *k, uts.release) < 0) 240 return NULL; 241 242 if (stat(kernel, &st) < 0 || !S_ISREG(st.st_mode)) { 243 k++; 244 continue; 245 } 246 return kernel; 247 248 } 249 return NULL; 250 } 251 252 static int root_device(char *dev, long *part) 253 { 254 FILE *fp; 255 char *line; 256 int tmp; 257 size_t nr_read; 258 char device[PATH_MAX]; 259 char mnt_pt[PATH_MAX]; 260 char resolved_path[PATH_MAX]; 261 char *p; 262 struct stat st; 263 264 fp = fopen("/proc/mounts", "r"); 265 if (!fp) 266 return -1; 267 268 line = NULL; 269 tmp = 0; 270 while (!feof(fp)) { 271 if (getline(&line, &nr_read, fp) < 0) 272 break; 273 sscanf(line, "%s %s", device, mnt_pt); 274 if (!strncmp(device, "/dev", 4) && !strcmp(mnt_pt, "/")) { 275 tmp = 1; 276 break; 277 } 278 } 279 fclose(fp); 280 free(line); 281 282 if (!tmp) 283 return -1; 284 285 /* get the absolute path */ 286 if (!realpath(device, resolved_path)) 287 return -1; 288 289 /* find the partition number */ 290 p = resolved_path; 291 while (*p) { 292 if (isdigit(*p)) { 293 strncpy(dev, resolved_path, p - resolved_path); 294 *part = atol(p); 295 break; 296 } 297 p++; 298 } 299 300 /* verify the device path */ 301 if (stat(dev, &st) < 0) 302 return -1; 303 304 if (access(dev, R_OK) < 0) 305 return -1; 306 307 return 0; 308 } 309 310 static char *host_image(char *cmd_line, size_t size) 311 { 312 char *t; 313 char device[PATH_MAX]; 314 long part = 0; 315 316 t = malloc(PATH_MAX); 317 if (!t) 318 return NULL; 319 320 /* check for the root file system */ 321 if (root_device(device, &part) < 0) { 322 free(t); 323 return NULL; 324 } 325 strncpy(t, device, PATH_MAX); 326 if (!strstr(cmd_line, "root=")) { 327 char tmp[PATH_MAX]; 328 snprintf(tmp, sizeof(tmp), "root=/dev/vda%ld rw ", part); 329 strlcat(cmd_line, tmp, size); 330 } 331 return t; 332 } 333 334 int kvm_cmd_run(int argc, const char **argv, const char *prefix) 335 { 336 static char real_cmdline[2048]; 337 int exit_code = 0; 338 int i; 339 struct virtio_net_parameters net_params; 340 char *hi; 341 unsigned int nr_online_cpus; 342 343 signal(SIGALRM, handle_sigalrm); 344 signal(SIGQUIT, handle_sigquit); 345 346 while (argc != 0) { 347 argc = parse_options(argc, argv, options, run_usage, 348 PARSE_OPT_STOP_AT_NON_OPTION); 349 if (argc != 0) { 350 if (kernel_filename) { 351 fprintf(stderr, "Cannot handle parameter: " 352 "%s\n", argv[0]); 353 usage_with_options(run_usage, options); 354 return EINVAL; 355 } 356 /* first unhandled parameter is treated as a kernel 357 image 358 */ 359 kernel_filename = argv[0]; 360 argv++; 361 argc--; 362 } 363 364 } 365 366 if (!kernel_filename) 367 kernel_filename = find_kernel(); 368 369 if (!kernel_filename) { 370 kernel_usage_with_options(); 371 return EINVAL; 372 } 373 374 if (nrcpus < 1 || nrcpus > KVM_NR_CPUS) 375 die("Number of CPUs %d is out of [1;%d] range", nrcpus, KVM_NR_CPUS); 376 377 /* FIXME: Remove as only SMP gets fully supported */ 378 if (nrcpus > 1) { 379 warning("Limiting CPUs to 1, true SMP is not yet implemented"); 380 nrcpus = 1; 381 } 382 383 if (ram_size < MIN_RAM_SIZE_MB) 384 die("Not enough memory specified: %lluMB (min %lluMB)", ram_size, MIN_RAM_SIZE_MB); 385 386 ram_size <<= MB_SHIFT; 387 388 if (!kvm_dev) 389 kvm_dev = DEFAULT_KVM_DEV; 390 391 if (!console) 392 console = DEFAULT_CONSOLE; 393 394 if (!strncmp(console, "virtio", 6)) 395 active_console = CONSOLE_VIRTIO; 396 else 397 active_console = CONSOLE_8250; 398 399 if (!host_ip_addr) 400 host_ip_addr = DEFAULT_HOST_ADDR; 401 402 if (!guest_mac) 403 guest_mac = DEFAULT_GUEST_MAC; 404 405 if (!script) 406 script = DEFAULT_SCRIPT; 407 408 term_init(); 409 410 kvm = kvm__init(kvm_dev, ram_size); 411 412 kvm->nrcpus = nrcpus; 413 414 memset(real_cmdline, 0, sizeof(real_cmdline)); 415 strcpy(real_cmdline, "notsc nolapic noacpi pci=conf1 console=ttyS0 "); 416 if (kernel_cmdline) 417 strlcat(real_cmdline, kernel_cmdline, sizeof(real_cmdline)); 418 419 hi = NULL; 420 if (!image_filename[0]) { 421 hi = host_image(real_cmdline, sizeof(real_cmdline)); 422 if (hi) { 423 image_filename[0] = hi; 424 readonly_image[0] = true; 425 } 426 } 427 428 if (!strstr(real_cmdline, "root=")) 429 strlcat(real_cmdline, " root=/dev/vda rw ", sizeof(real_cmdline)); 430 431 for (i = 0; i < image_count; i++) { 432 if (image_filename[i]) { 433 struct disk_image *disk = disk_image__open(image_filename[i], readonly_image[i]); 434 if (!disk) 435 die("unable to load disk image %s", image_filename[i]); 436 437 virtio_blk__init(kvm, disk); 438 } 439 } 440 free(hi); 441 442 if (!kvm__load_kernel(kvm, kernel_filename, initrd_filename, 443 real_cmdline)) 444 die("unable to load kernel %s", kernel_filename); 445 446 ioport__setup_legacy(); 447 448 rtc__init(); 449 450 kvm__setup_bios(kvm); 451 452 serial8250__init(kvm); 453 454 pci__init(); 455 456 virtio_console__init(kvm); 457 458 if (virtio_rng) 459 virtio_rng__init(kvm); 460 461 if (!network) 462 network = DEFAULT_NETWORK; 463 464 if (!strncmp(network, "virtio", 6)) { 465 net_params = (struct virtio_net_parameters) { 466 .host_ip = host_ip_addr, 467 .self = kvm, 468 .script = script 469 }; 470 sscanf(guest_mac, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", 471 net_params.guest_mac, 472 net_params.guest_mac+1, 473 net_params.guest_mac+2, 474 net_params.guest_mac+3, 475 net_params.guest_mac+4, 476 net_params.guest_mac+5); 477 478 virtio_net__init(&net_params); 479 } 480 481 kvm__start_timer(kvm); 482 483 for (i = 0; i < nrcpus; i++) { 484 kvm_cpus[i] = kvm_cpu__init(kvm, i); 485 if (!kvm_cpus[i]) 486 die("unable to initialize KVM VCPU"); 487 488 if (single_step) 489 kvm_cpu__enable_singlestep(kvm_cpus[i]); 490 } 491 492 kvm__init_ram(kvm); 493 494 nr_online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 495 thread_pool__init(nr_online_cpus); 496 497 for (i = 0; i < nrcpus; i++) { 498 if (pthread_create(&kvm_cpus[i]->thread, NULL, kvm_cpu_thread, kvm_cpus[i]) != 0) 499 die("unable to create KVM VCPU thread"); 500 } 501 502 for (i = 0; i < nrcpus; i++) { 503 void *ret; 504 505 if (pthread_join(kvm_cpus[i]->thread, &ret) != 0) 506 die("pthread_join"); 507 508 if (ret != NULL) 509 exit_code = 1; 510 } 511 512 kvm__delete(kvm); 513 514 if (!exit_code) 515 printf("\n # KVM session ended normally.\n"); 516 517 return exit_code; 518 } 519