1 #include <stdio.h> 2 #include <string.h> 3 #include <signal.h> 4 #include <unistd.h> 5 #include <stdlib.h> 6 #include <termios.h> 7 #include <sys/utsname.h> 8 #include <sys/types.h> 9 #include <sys/stat.h> 10 #include <ctype.h> 11 12 /* user defined header files */ 13 #include <linux/types.h> 14 #include <kvm/kvm.h> 15 #include <kvm/kvm-cpu.h> 16 #include <kvm/8250-serial.h> 17 #include <kvm/virtio-blk.h> 18 #include <kvm/virtio-net.h> 19 #include <kvm/virtio-console.h> 20 #include <kvm/virtio-rng.h> 21 #include <kvm/disk-image.h> 22 #include <kvm/util.h> 23 #include <kvm/pci.h> 24 #include <kvm/rtc.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 #define MAX_DISK_IMAGES 4 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; 50 static u8 image_count; 51 static const char *kernel_cmdline; 52 static const char *kernel_filename; 53 static const char *initrd_filename; 54 static const char *image_filename[MAX_DISK_IMAGES]; 55 static const char *console; 56 static const char *kvm_dev; 57 static const char *network; 58 static const char *host_ip_addr; 59 static const char *guest_mac; 60 static const char *script; 61 static bool single_step; 62 static bool readonly_image[MAX_DISK_IMAGES]; 63 static bool virtio_rng; 64 extern bool ioport_debug; 65 extern int active_console; 66 67 static int nrcpus = 1; 68 69 static const char * const run_usage[] = { 70 "kvm run [<options>] [<kernel image>]", 71 NULL 72 }; 73 74 static int img_name_parser(const struct option *opt, const char *arg, int unset) 75 { 76 char *sep; 77 78 if (image_count >= MAX_DISK_IMAGES) 79 die("Currently only 4 images are supported"); 80 81 image_filename[image_count] = arg; 82 sep = strstr(arg, ","); 83 if (sep) { 84 if (strcmp(sep + 1, "ro") == 0) 85 readonly_image[image_count] = 1; 86 *sep = 0; 87 } 88 89 image_count++; 90 91 return 0; 92 } 93 94 static const struct option options[] = { 95 OPT_GROUP("Basic options:"), 96 OPT_INTEGER('\0', "cpus", &nrcpus, "Number of CPUs"), 97 OPT_U64('m', "mem", &ram_size, "Virtual machine memory size in MiB."), 98 OPT_CALLBACK('i', "image", NULL, "image", "Disk image", img_name_parser), 99 OPT_STRING('c', "console", &console, "serial or virtio", 100 "Console to use"), 101 OPT_BOOLEAN('\0', "virtio-rng", &virtio_rng, 102 "Enable virtio Random Number Generator"), 103 104 OPT_GROUP("Kernel options:"), 105 OPT_STRING('k', "kernel", &kernel_filename, "kernel", 106 "Kernel to boot in virtual machine"), 107 OPT_STRING('r', "initrd", &initrd_filename, "initrd", 108 "Initial RAM disk image"), 109 OPT_STRING('p', "params", &kernel_cmdline, "params", 110 "Kernel command line arguments"), 111 112 OPT_GROUP("Networking options:"), 113 OPT_STRING('n', "network", &network, "virtio", 114 "Network to use"), 115 OPT_STRING('\0', "host-ip-addr", &host_ip_addr, "a.b.c.d", 116 "Assign this address to the host side networking"), 117 OPT_STRING('\0', "guest-mac", &guest_mac, "aa:bb:cc:dd:ee:ff", 118 "Assign this address to the guest side NIC"), 119 OPT_STRING('\0', "tapscript", &script, "Script path", 120 "Assign a script to process created tap device"), 121 OPT_GROUP("Debug options:"), 122 OPT_STRING('d', "kvm-dev", &kvm_dev, "kvm-dev", "KVM device file"), 123 OPT_BOOLEAN('s', "single-step", &single_step, 124 "Enable single stepping"), 125 OPT_BOOLEAN('g', "ioport-debug", &ioport_debug, 126 "Enable ioport debugging"), 127 OPT_END() 128 }; 129 130 static void handle_sigusr1(int sig) 131 { 132 struct kvm_cpu *cpu = current_kvm_cpu; 133 134 if (!cpu) 135 return; 136 137 kvm_cpu__show_registers(cpu); 138 kvm_cpu__show_code(cpu); 139 kvm_cpu__show_page_tables(cpu); 140 } 141 142 static void handle_sigquit(int sig) 143 { 144 int i; 145 146 for (i = 0; i < nrcpus; i++) { 147 struct kvm_cpu *cpu = kvm_cpus[i]; 148 149 if (!cpu) 150 continue; 151 152 pthread_kill(cpu->thread, SIGUSR1); 153 } 154 155 serial8250__inject_sysrq(kvm); 156 } 157 158 static void handle_sigalrm(int sig) 159 { 160 serial8250__inject_interrupt(kvm); 161 virtio_console__inject_interrupt(kvm); 162 } 163 164 static void *kvm_cpu_thread(void *arg) 165 { 166 current_kvm_cpu = arg; 167 168 if (kvm_cpu__start(current_kvm_cpu)) 169 goto panic_kvm; 170 171 kvm_cpu__delete(current_kvm_cpu); 172 173 return (void *) (intptr_t) 0; 174 175 panic_kvm: 176 fprintf(stderr, "KVM exit reason: %u (\"%s\")\n", 177 current_kvm_cpu->kvm_run->exit_reason, 178 kvm_exit_reasons[current_kvm_cpu->kvm_run->exit_reason]); 179 if (current_kvm_cpu->kvm_run->exit_reason == KVM_EXIT_UNKNOWN) 180 fprintf(stderr, "KVM exit code: 0x%Lu\n", 181 current_kvm_cpu->kvm_run->hw.hardware_exit_reason); 182 183 kvm_cpu__show_registers(current_kvm_cpu); 184 kvm_cpu__show_code(current_kvm_cpu); 185 kvm_cpu__show_page_tables(current_kvm_cpu); 186 187 kvm_cpu__delete(current_kvm_cpu); 188 189 return (void *) (intptr_t) 1; 190 } 191 192 static char kernel[PATH_MAX]; 193 const char *host_kernels[] = { 194 "/boot/vmlinuz", 195 "/boot/bzImage", 196 NULL 197 }; 198 const char *default_kernels[] = { 199 "./bzImage", 200 "../../arch/x86/boot/bzImage", 201 NULL 202 }; 203 204 static void kernel_usage_with_options(void) 205 { 206 const char **k; 207 struct utsname uts; 208 209 fprintf(stderr, "Fatal: could not find default kernel image in:\n"); 210 k = &default_kernels[0]; 211 while (*k) { 212 fprintf(stderr, "\t%s\n", *k); 213 k++; 214 } 215 216 if (uname(&uts) < 0) 217 return; 218 219 k = &host_kernels[0]; 220 while (*k) { 221 if (snprintf(kernel, PATH_MAX, "%s-%s", *k, uts.release) < 0) 222 return; 223 fprintf(stderr, "\t%s\n", kernel); 224 k++; 225 } 226 fprintf(stderr, "\nPlease see 'kvm run --help' for more options.\n\n"); 227 } 228 229 static u64 host_ram_size(void) 230 { 231 long page_size; 232 long nr_pages; 233 234 nr_pages = sysconf(_SC_PHYS_PAGES); 235 236 page_size = sysconf(_SC_PAGE_SIZE); 237 238 return (nr_pages * page_size) >> MB_SHIFT; 239 } 240 241 /* 242 * If user didn't specify how much memory it wants to allocate for the guest, 243 * avoid filling the whole host RAM. 244 */ 245 #define RAM_SIZE_RATIO 0.8 246 247 static u64 get_ram_size(int nr_cpus) 248 { 249 long available; 250 long ram_size; 251 252 ram_size = 64 * (nr_cpus + 3); 253 254 available = host_ram_size() * RAM_SIZE_RATIO; 255 256 if (ram_size > available) 257 ram_size = available; 258 259 return ram_size; 260 } 261 262 static const char *find_kernel(void) 263 { 264 const char **k; 265 struct stat st; 266 struct utsname uts; 267 268 k = &default_kernels[0]; 269 while (*k) { 270 if (stat(*k, &st) < 0 || !S_ISREG(st.st_mode)) { 271 k++; 272 continue; 273 } 274 strncpy(kernel, *k, PATH_MAX); 275 return kernel; 276 } 277 278 if (uname(&uts) < 0) 279 return NULL; 280 281 k = &host_kernels[0]; 282 while (*k) { 283 if (snprintf(kernel, PATH_MAX, "%s-%s", *k, uts.release) < 0) 284 return NULL; 285 286 if (stat(kernel, &st) < 0 || !S_ISREG(st.st_mode)) { 287 k++; 288 continue; 289 } 290 return kernel; 291 292 } 293 return NULL; 294 } 295 296 static int root_device(char *dev, long *part) 297 { 298 struct stat st; 299 300 if (stat("/", &st) < 0) 301 return -1; 302 303 *part = minor(st.st_dev); 304 305 sprintf(dev, "/dev/block/%u:0", major(st.st_dev)); 306 if (access(dev, R_OK) < 0) 307 return -1; 308 309 return 0; 310 } 311 312 static char *host_image(char *cmd_line, size_t size) 313 { 314 char *t; 315 char device[PATH_MAX]; 316 long part = 0; 317 318 t = malloc(PATH_MAX); 319 if (!t) 320 return NULL; 321 322 /* check for the root file system */ 323 if (root_device(device, &part) < 0) { 324 free(t); 325 return NULL; 326 } 327 strncpy(t, device, PATH_MAX); 328 if (!strstr(cmd_line, "root=")) { 329 char tmp[PATH_MAX]; 330 snprintf(tmp, sizeof(tmp), "root=/dev/vda%ld rw ", part); 331 strlcat(cmd_line, tmp, size); 332 } 333 return t; 334 } 335 336 int kvm_cmd_run(int argc, const char **argv, const char *prefix) 337 { 338 static char real_cmdline[2048]; 339 unsigned int nr_online_cpus; 340 int max_cpus; 341 int exit_code = 0; 342 int i; 343 struct virtio_net_parameters net_params; 344 char *hi; 345 346 signal(SIGALRM, handle_sigalrm); 347 signal(SIGQUIT, handle_sigquit); 348 signal(SIGUSR1, handle_sigusr1); 349 350 while (argc != 0) { 351 argc = parse_options(argc, argv, options, run_usage, 352 PARSE_OPT_STOP_AT_NON_OPTION); 353 if (argc != 0) { 354 if (kernel_filename) { 355 fprintf(stderr, "Cannot handle parameter: " 356 "%s\n", argv[0]); 357 usage_with_options(run_usage, options); 358 return EINVAL; 359 } 360 /* first unhandled parameter is treated as a kernel 361 image 362 */ 363 kernel_filename = argv[0]; 364 argv++; 365 argc--; 366 } 367 368 } 369 370 if (!kernel_filename) 371 kernel_filename = find_kernel(); 372 373 if (!kernel_filename) { 374 kernel_usage_with_options(); 375 return EINVAL; 376 } 377 378 if (nrcpus < 1 || nrcpus > KVM_NR_CPUS) 379 die("Number of CPUs %d is out of [1;%d] range", nrcpus, KVM_NR_CPUS); 380 381 if (!ram_size) 382 ram_size = get_ram_size(nrcpus); 383 384 if (ram_size < MIN_RAM_SIZE_MB) 385 die("Not enough memory specified: %lluMB (min %lluMB)", ram_size, MIN_RAM_SIZE_MB); 386 387 if (ram_size > host_ram_size()) 388 warning("Guest memory size %lluMB exceeds host physical RAM size %lluMB", ram_size, host_ram_size()); 389 390 ram_size <<= MB_SHIFT; 391 392 if (!kvm_dev) 393 kvm_dev = DEFAULT_KVM_DEV; 394 395 if (!console) 396 console = DEFAULT_CONSOLE; 397 398 if (!strncmp(console, "virtio", 6)) 399 active_console = CONSOLE_VIRTIO; 400 else 401 active_console = CONSOLE_8250; 402 403 if (!host_ip_addr) 404 host_ip_addr = DEFAULT_HOST_ADDR; 405 406 if (!guest_mac) 407 guest_mac = DEFAULT_GUEST_MAC; 408 409 if (!script) 410 script = DEFAULT_SCRIPT; 411 412 term_init(); 413 414 kvm = kvm__init(kvm_dev, ram_size); 415 416 max_cpus = kvm__max_cpus(kvm); 417 418 if (nrcpus > max_cpus) { 419 printf(" # Limit the number of CPUs to %d\n", max_cpus); 420 kvm->nrcpus = max_cpus; 421 } 422 423 kvm->nrcpus = nrcpus; 424 425 memset(real_cmdline, 0, sizeof(real_cmdline)); 426 strcpy(real_cmdline, "notsc noapic noacpi pci=conf1 console=ttyS0 earlyprintk=serial"); 427 strcat(real_cmdline, " "); 428 if (kernel_cmdline) 429 strlcat(real_cmdline, kernel_cmdline, sizeof(real_cmdline)); 430 431 hi = NULL; 432 if (!image_filename[0]) { 433 hi = host_image(real_cmdline, sizeof(real_cmdline)); 434 if (hi) { 435 image_filename[0] = hi; 436 readonly_image[0] = true; 437 image_count++; 438 } 439 } 440 441 if (!strstr(real_cmdline, "root=")) 442 strlcat(real_cmdline, " root=/dev/vda rw ", sizeof(real_cmdline)); 443 444 for (i = 0; i < image_count; i++) { 445 if (image_filename[i]) { 446 struct disk_image *disk = disk_image__open(image_filename[i], readonly_image[i]); 447 if (!disk) 448 die("unable to load disk image %s", image_filename[i]); 449 450 virtio_blk__init(kvm, disk); 451 } 452 } 453 free(hi); 454 455 if (!kvm__load_kernel(kvm, kernel_filename, initrd_filename, 456 real_cmdline)) 457 die("unable to load kernel %s", kernel_filename); 458 459 ioport__setup_legacy(); 460 461 rtc__init(); 462 463 serial8250__init(kvm); 464 465 pci__init(); 466 467 if (active_console == CONSOLE_VIRTIO) 468 virtio_console__init(kvm); 469 470 if (virtio_rng) 471 virtio_rng__init(kvm); 472 473 if (!network) 474 network = DEFAULT_NETWORK; 475 476 if (!strncmp(network, "virtio", 6)) { 477 net_params = (struct virtio_net_parameters) { 478 .host_ip = host_ip_addr, 479 .self = kvm, 480 .script = script 481 }; 482 sscanf(guest_mac, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", 483 net_params.guest_mac, 484 net_params.guest_mac+1, 485 net_params.guest_mac+2, 486 net_params.guest_mac+3, 487 net_params.guest_mac+4, 488 net_params.guest_mac+5); 489 490 virtio_net__init(&net_params); 491 } 492 493 kvm__start_timer(kvm); 494 495 kvm__setup_bios(kvm); 496 497 for (i = 0; i < nrcpus; i++) { 498 kvm_cpus[i] = kvm_cpu__init(kvm, i); 499 if (!kvm_cpus[i]) 500 die("unable to initialize KVM VCPU"); 501 502 if (single_step) 503 kvm_cpu__enable_singlestep(kvm_cpus[i]); 504 } 505 506 kvm__init_ram(kvm); 507 508 nr_online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 509 thread_pool__init(nr_online_cpus); 510 511 for (i = 0; i < nrcpus; i++) { 512 if (pthread_create(&kvm_cpus[i]->thread, NULL, kvm_cpu_thread, kvm_cpus[i]) != 0) 513 die("unable to create KVM VCPU thread"); 514 } 515 516 for (i = 0; i < nrcpus; i++) { 517 void *ret; 518 519 if (pthread_join(kvm_cpus[i]->thread, &ret) != 0) 520 die("pthread_join"); 521 522 if (ret != NULL) 523 exit_code = 1; 524 } 525 526 kvm__delete(kvm); 527 528 if (!exit_code) 529 printf("\n # KVM session ended normally.\n"); 530 531 return exit_code; 532 } 533