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