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_sigquit(int sig) 131 { 132 int i; 133 134 for (i = 0; i < nrcpus; i++) { 135 struct kvm_cpu *cpu = kvm_cpus[i]; 136 137 kvm_cpu__show_registers(cpu); 138 kvm_cpu__show_code(cpu); 139 kvm_cpu__show_page_tables(cpu); 140 } 141 142 serial8250__inject_sysrq(kvm); 143 } 144 145 static void handle_sigalrm(int sig) 146 { 147 serial8250__inject_interrupt(kvm); 148 virtio_console__inject_interrupt(kvm); 149 } 150 151 static void *kvm_cpu_thread(void *arg) 152 { 153 current_kvm_cpu = arg; 154 155 if (kvm_cpu__start(current_kvm_cpu)) 156 goto panic_kvm; 157 158 kvm_cpu__delete(current_kvm_cpu); 159 160 return (void *) (intptr_t) 0; 161 162 panic_kvm: 163 fprintf(stderr, "KVM exit reason: %u (\"%s\")\n", 164 current_kvm_cpu->kvm_run->exit_reason, 165 kvm_exit_reasons[current_kvm_cpu->kvm_run->exit_reason]); 166 if (current_kvm_cpu->kvm_run->exit_reason == KVM_EXIT_UNKNOWN) 167 fprintf(stderr, "KVM exit code: 0x%Lu\n", 168 current_kvm_cpu->kvm_run->hw.hardware_exit_reason); 169 170 kvm_cpu__show_registers(current_kvm_cpu); 171 kvm_cpu__show_code(current_kvm_cpu); 172 kvm_cpu__show_page_tables(current_kvm_cpu); 173 174 kvm_cpu__delete(current_kvm_cpu); 175 176 return (void *) (intptr_t) 1; 177 } 178 179 static char kernel[PATH_MAX]; 180 const char *host_kernels[] = { 181 "/boot/vmlinuz", 182 "/boot/bzImage", 183 NULL 184 }; 185 const char *default_kernels[] = { 186 "./bzImage", 187 "../../arch/x86/boot/bzImage", 188 NULL 189 }; 190 191 static void kernel_usage_with_options(void) 192 { 193 const char **k; 194 struct utsname uts; 195 196 fprintf(stderr, "Fatal: could not find default kernel image in:\n"); 197 k = &default_kernels[0]; 198 while (*k) { 199 fprintf(stderr, "\t%s\n", *k); 200 k++; 201 } 202 203 if (uname(&uts) < 0) 204 return; 205 206 k = &host_kernels[0]; 207 while (*k) { 208 if (snprintf(kernel, PATH_MAX, "%s-%s", *k, uts.release) < 0) 209 return; 210 fprintf(stderr, "\t%s\n", kernel); 211 k++; 212 } 213 fprintf(stderr, "\nPlease see 'kvm run --help' for more options.\n\n"); 214 } 215 216 static u64 host_ram_size(void) 217 { 218 long page_size; 219 long nr_pages; 220 221 nr_pages = sysconf(_SC_PHYS_PAGES); 222 223 page_size = sysconf(_SC_PAGE_SIZE); 224 225 return (nr_pages * page_size) >> MB_SHIFT; 226 } 227 228 /* 229 * If user didn't specify how much memory it wants to allocate for the guest, 230 * avoid filling the whole host RAM. 231 */ 232 #define RAM_SIZE_RATIO 0.8 233 234 static u64 get_ram_size(int nr_cpus) 235 { 236 long available; 237 long ram_size; 238 239 ram_size = 64 * (nr_cpus + 3); 240 241 available = host_ram_size() * RAM_SIZE_RATIO; 242 243 if (ram_size > available) 244 ram_size = available; 245 246 return ram_size; 247 } 248 249 static const char *find_kernel(void) 250 { 251 const char **k; 252 struct stat st; 253 struct utsname uts; 254 255 k = &default_kernels[0]; 256 while (*k) { 257 if (stat(*k, &st) < 0 || !S_ISREG(st.st_mode)) { 258 k++; 259 continue; 260 } 261 strncpy(kernel, *k, PATH_MAX); 262 return kernel; 263 } 264 265 if (uname(&uts) < 0) 266 return NULL; 267 268 k = &host_kernels[0]; 269 while (*k) { 270 if (snprintf(kernel, PATH_MAX, "%s-%s", *k, uts.release) < 0) 271 return NULL; 272 273 if (stat(kernel, &st) < 0 || !S_ISREG(st.st_mode)) { 274 k++; 275 continue; 276 } 277 return kernel; 278 279 } 280 return NULL; 281 } 282 283 static int root_device(char *dev, long *part) 284 { 285 struct stat st; 286 287 if (stat("/", &st) < 0) 288 return -1; 289 290 *part = minor(st.st_dev); 291 292 sprintf(dev, "/dev/block/%u:0", major(st.st_dev)); 293 if (access(dev, R_OK) < 0) 294 return -1; 295 296 return 0; 297 } 298 299 static char *host_image(char *cmd_line, size_t size) 300 { 301 char *t; 302 char device[PATH_MAX]; 303 long part = 0; 304 305 t = malloc(PATH_MAX); 306 if (!t) 307 return NULL; 308 309 /* check for the root file system */ 310 if (root_device(device, &part) < 0) { 311 free(t); 312 return NULL; 313 } 314 strncpy(t, device, PATH_MAX); 315 if (!strstr(cmd_line, "root=")) { 316 char tmp[PATH_MAX]; 317 snprintf(tmp, sizeof(tmp), "root=/dev/vda%ld rw ", part); 318 strlcat(cmd_line, tmp, size); 319 } 320 return t; 321 } 322 323 int kvm_cmd_run(int argc, const char **argv, const char *prefix) 324 { 325 static char real_cmdline[2048]; 326 unsigned int nr_online_cpus; 327 int max_cpus; 328 int exit_code = 0; 329 int i; 330 struct virtio_net_parameters net_params; 331 char *hi; 332 333 signal(SIGALRM, handle_sigalrm); 334 signal(SIGQUIT, handle_sigquit); 335 336 while (argc != 0) { 337 argc = parse_options(argc, argv, options, run_usage, 338 PARSE_OPT_STOP_AT_NON_OPTION); 339 if (argc != 0) { 340 if (kernel_filename) { 341 fprintf(stderr, "Cannot handle parameter: " 342 "%s\n", argv[0]); 343 usage_with_options(run_usage, options); 344 return EINVAL; 345 } 346 /* first unhandled parameter is treated as a kernel 347 image 348 */ 349 kernel_filename = argv[0]; 350 argv++; 351 argc--; 352 } 353 354 } 355 356 if (!kernel_filename) 357 kernel_filename = find_kernel(); 358 359 if (!kernel_filename) { 360 kernel_usage_with_options(); 361 return EINVAL; 362 } 363 364 if (nrcpus < 1 || nrcpus > KVM_NR_CPUS) 365 die("Number of CPUs %d is out of [1;%d] range", nrcpus, KVM_NR_CPUS); 366 367 if (!ram_size) 368 ram_size = get_ram_size(nrcpus); 369 370 if (ram_size < MIN_RAM_SIZE_MB) 371 die("Not enough memory specified: %lluMB (min %lluMB)", ram_size, MIN_RAM_SIZE_MB); 372 373 if (ram_size > host_ram_size()) 374 warning("Guest memory size %lluMB exceeds host physical RAM size %lluMB", ram_size, host_ram_size()); 375 376 ram_size <<= MB_SHIFT; 377 378 if (!kvm_dev) 379 kvm_dev = DEFAULT_KVM_DEV; 380 381 if (!console) 382 console = DEFAULT_CONSOLE; 383 384 if (!strncmp(console, "virtio", 6)) 385 active_console = CONSOLE_VIRTIO; 386 else 387 active_console = CONSOLE_8250; 388 389 if (!host_ip_addr) 390 host_ip_addr = DEFAULT_HOST_ADDR; 391 392 if (!guest_mac) 393 guest_mac = DEFAULT_GUEST_MAC; 394 395 if (!script) 396 script = DEFAULT_SCRIPT; 397 398 term_init(); 399 400 kvm = kvm__init(kvm_dev, ram_size); 401 402 max_cpus = kvm__max_cpus(kvm); 403 404 if (nrcpus > max_cpus) { 405 printf(" # Limit the number of CPUs to %d\n", max_cpus); 406 kvm->nrcpus = max_cpus; 407 } 408 409 kvm->nrcpus = nrcpus; 410 411 memset(real_cmdline, 0, sizeof(real_cmdline)); 412 strcpy(real_cmdline, "notsc noapic noacpi pci=conf1 console=ttyS0 earlyprintk=serial"); 413 if (kernel_cmdline) 414 strlcat(real_cmdline, kernel_cmdline, sizeof(real_cmdline)); 415 416 hi = NULL; 417 if (!image_filename[0]) { 418 hi = host_image(real_cmdline, sizeof(real_cmdline)); 419 if (hi) { 420 image_filename[0] = hi; 421 readonly_image[0] = true; 422 image_count++; 423 } 424 } 425 426 if (!strstr(real_cmdline, "root=")) 427 strlcat(real_cmdline, " root=/dev/vda rw ", sizeof(real_cmdline)); 428 429 for (i = 0; i < image_count; i++) { 430 if (image_filename[i]) { 431 struct disk_image *disk = disk_image__open(image_filename[i], readonly_image[i]); 432 if (!disk) 433 die("unable to load disk image %s", image_filename[i]); 434 435 virtio_blk__init(kvm, disk); 436 } 437 } 438 free(hi); 439 440 if (!kvm__load_kernel(kvm, kernel_filename, initrd_filename, 441 real_cmdline)) 442 die("unable to load kernel %s", kernel_filename); 443 444 ioport__setup_legacy(); 445 446 rtc__init(); 447 448 serial8250__init(kvm); 449 450 pci__init(); 451 452 if (active_console == CONSOLE_VIRTIO) 453 virtio_console__init(kvm); 454 455 if (virtio_rng) 456 virtio_rng__init(kvm); 457 458 if (!network) 459 network = DEFAULT_NETWORK; 460 461 if (!strncmp(network, "virtio", 6)) { 462 net_params = (struct virtio_net_parameters) { 463 .host_ip = host_ip_addr, 464 .self = kvm, 465 .script = script 466 }; 467 sscanf(guest_mac, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", 468 net_params.guest_mac, 469 net_params.guest_mac+1, 470 net_params.guest_mac+2, 471 net_params.guest_mac+3, 472 net_params.guest_mac+4, 473 net_params.guest_mac+5); 474 475 virtio_net__init(&net_params); 476 } 477 478 kvm__start_timer(kvm); 479 480 kvm__setup_bios(kvm); 481 482 for (i = 0; i < nrcpus; i++) { 483 kvm_cpus[i] = kvm_cpu__init(kvm, i); 484 if (!kvm_cpus[i]) 485 die("unable to initialize KVM VCPU"); 486 487 if (single_step) 488 kvm_cpu__enable_singlestep(kvm_cpus[i]); 489 } 490 491 kvm__init_ram(kvm); 492 493 nr_online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 494 thread_pool__init(nr_online_cpus); 495 496 for (i = 0; i < nrcpus; i++) { 497 if (pthread_create(&kvm_cpus[i]->thread, NULL, kvm_cpu_thread, kvm_cpus[i]) != 0) 498 die("unable to create KVM VCPU thread"); 499 } 500 501 for (i = 0; i < nrcpus; i++) { 502 void *ret; 503 504 if (pthread_join(kvm_cpus[i]->thread, &ret) != 0) 505 die("pthread_join"); 506 507 if (ret != NULL) 508 exit_code = 1; 509 } 510 511 kvm__delete(kvm); 512 513 if (!exit_code) 514 printf("\n # KVM session ended normally.\n"); 515 516 return exit_code; 517 } 518