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 usage_with_options(run_usage, options); 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 return 0; 268 } 269 270 static char *host_image(char *cmd_line, size_t size) 271 { 272 char *t; 273 char device[PATH_MAX]; 274 long part = 0; 275 276 t = malloc(PATH_MAX); 277 if (!t) 278 return NULL; 279 280 /* check for the root file system */ 281 if (root_device(device, &part) < 0) { 282 free(t); 283 return NULL; 284 } 285 strncpy(t, device, PATH_MAX); 286 if (!strstr(cmd_line, "root=")) { 287 char tmp[PATH_MAX]; 288 snprintf(tmp, sizeof(tmp), "root=/dev/vda%ld rw ", part); 289 strlcat(cmd_line, tmp, size); 290 } 291 return t; 292 } 293 294 int kvm_cmd_run(int argc, const char **argv, const char *prefix) 295 { 296 static char real_cmdline[2048]; 297 int exit_code = 0; 298 int i; 299 struct virtio_net_parameters net_params; 300 char *hi; 301 302 signal(SIGALRM, handle_sigalrm); 303 signal(SIGQUIT, handle_sigquit); 304 305 while (argc != 0) { 306 argc = parse_options(argc, argv, options, run_usage, 307 PARSE_OPT_STOP_AT_NON_OPTION); 308 if (argc != 0) { 309 if (kernel_filename) { 310 fprintf(stderr, "Cannot handle parameter: " 311 "%s\n", argv[0]); 312 usage_with_options(run_usage, options); 313 return EINVAL; 314 } 315 /* first unhandled parameter is treated as a kernel 316 image 317 */ 318 kernel_filename = argv[0]; 319 argv++; 320 argc--; 321 } 322 323 } 324 325 if (!kernel_filename) 326 kernel_filename = find_kernel(); 327 328 if (!kernel_filename) { 329 kernel_usage_with_options(); 330 return EINVAL; 331 } 332 333 if (nrcpus < 1 || nrcpus > KVM_NR_CPUS) 334 die("Number of CPUs %d is out of [1;%d] range", nrcpus, KVM_NR_CPUS); 335 336 /* FIXME: Remove as only SMP gets fully supported */ 337 if (nrcpus > 1) { 338 warning("Limiting CPUs to 1, true SMP is not yet implemented"); 339 nrcpus = 1; 340 } 341 342 if (ram_size < MIN_RAM_SIZE_MB) 343 die("Not enough memory specified: %lluMB (min %lluMB)", ram_size, MIN_RAM_SIZE_MB); 344 345 ram_size <<= MB_SHIFT; 346 347 if (!kvm_dev) 348 kvm_dev = DEFAULT_KVM_DEV; 349 350 if (!console) 351 console = DEFAULT_CONSOLE; 352 353 if (!strncmp(console, "virtio", 6)) 354 active_console = CONSOLE_VIRTIO; 355 else 356 active_console = CONSOLE_8250; 357 358 if (!host_ip_addr) 359 host_ip_addr = DEFAULT_HOST_ADDR; 360 361 if (!guest_mac) 362 guest_mac = DEFAULT_GUEST_MAC; 363 364 if (!script) 365 script = DEFAULT_SCRIPT; 366 367 term_init(); 368 369 kvm = kvm__init(kvm_dev, ram_size); 370 371 kvm->nrcpus = nrcpus; 372 373 memset(real_cmdline, 0, sizeof(real_cmdline)); 374 strcpy(real_cmdline, "notsc nolapic noacpi pci=conf1 console=ttyS0 "); 375 if (kernel_cmdline) 376 strlcat(real_cmdline, kernel_cmdline, sizeof(real_cmdline)); 377 378 hi = NULL; 379 if (!image_filename) { 380 hi = host_image(real_cmdline, sizeof(real_cmdline)); 381 if (hi) { 382 image_filename = hi; 383 readonly_image = true; 384 } 385 } 386 387 if (!strstr(real_cmdline, "root=")) 388 strlcat(real_cmdline, " root=/dev/vda rw ", sizeof(real_cmdline)); 389 390 if (image_filename) { 391 kvm->disk_image = disk_image__open(image_filename, readonly_image); 392 if (!kvm->disk_image) 393 die("unable to load disk image %s", image_filename); 394 } 395 free(hi); 396 397 if (!kvm__load_kernel(kvm, kernel_filename, initrd_filename, 398 real_cmdline)) 399 die("unable to load kernel %s", kernel_filename); 400 401 ioport__setup_legacy(); 402 403 kvm__setup_bios(kvm); 404 405 serial8250__init(kvm); 406 407 pci__init(); 408 409 virtio_blk__init(kvm); 410 411 virtio_console__init(kvm); 412 413 if (!network) 414 network = DEFAULT_NETWORK; 415 416 if (!strncmp(network, "virtio", 6)) { 417 net_params = (struct virtio_net_parameters) { 418 .host_ip = host_ip_addr, 419 .self = kvm, 420 .script = script 421 }; 422 sscanf(guest_mac, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", 423 net_params.guest_mac, 424 net_params.guest_mac+1, 425 net_params.guest_mac+2, 426 net_params.guest_mac+3, 427 net_params.guest_mac+4, 428 net_params.guest_mac+5); 429 430 virtio_net__init(&net_params); 431 } 432 433 kvm__start_timer(kvm); 434 435 for (i = 0; i < nrcpus; i++) { 436 kvm_cpus[i] = kvm_cpu__init(kvm, i); 437 if (!kvm_cpus[i]) 438 die("unable to initialize KVM VCPU"); 439 440 if (single_step) 441 kvm_cpu__enable_singlestep(kvm_cpus[i]); 442 } 443 444 kvm__init_ram(kvm); 445 446 for (i = 0; i < nrcpus; i++) { 447 if (pthread_create(&kvm_cpus[i]->thread, NULL, kvm_cpu_thread, kvm_cpus[i]) != 0) 448 die("unable to create KVM VCPU thread"); 449 } 450 451 for (i = 0; i < nrcpus; i++) { 452 void *ret; 453 454 if (pthread_join(kvm_cpus[i]->thread, &ret) != 0) 455 die("pthread_join"); 456 457 if (ret != NULL) 458 exit_code = 1; 459 } 460 461 disk_image__close(kvm->disk_image); 462 kvm__delete(kvm); 463 464 if (!exit_code) 465 printf("\n # KVM session ended normally.\n"); 466 467 return exit_code; 468 } 469