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