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