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