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