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 #include <kvm/barrier.h> 29 #include <kvm/symbol.h> 30 #include <kvm/virtio-9p.h> 31 #include <kvm/vesa.h> 32 #include <kvm/ioeventfd.h> 33 34 /* header files for gitish interface */ 35 #include <kvm/kvm-run.h> 36 #include <kvm/parse-options.h> 37 #include <kvm/mutex.h> 38 39 #define DEFAULT_KVM_DEV "/dev/kvm" 40 #define DEFAULT_CONSOLE "serial" 41 #define DEFAULT_NETWORK "virtio" 42 #define DEFAULT_HOST_ADDR "192.168.33.2" 43 #define DEFAULT_GUEST_MAC "00:11:22:33:44:55" 44 #define DEFAULT_SCRIPT "none" 45 46 #define MB_SHIFT (20) 47 #define MIN_RAM_SIZE_MB (64ULL) 48 #define MIN_RAM_SIZE_BYTE (MIN_RAM_SIZE_MB << MB_SHIFT) 49 50 struct kvm *kvm; 51 struct kvm_cpu *kvm_cpus[KVM_NR_CPUS]; 52 __thread struct kvm_cpu *current_kvm_cpu; 53 54 static u64 ram_size; 55 static u8 image_count; 56 static int virtio_rng; 57 static const char *kernel_cmdline; 58 static const char *kernel_filename; 59 static const char *vmlinux_filename; 60 static const char *initrd_filename; 61 static const char *image_filename[MAX_DISK_IMAGES]; 62 static const char *console; 63 static const char *kvm_dev; 64 static const char *network; 65 static const char *host_ip_addr; 66 static const char *guest_mac; 67 static const char *script; 68 static const char *virtio_9p_dir; 69 static bool single_step; 70 static bool readonly_image[MAX_DISK_IMAGES]; 71 static bool vnc; 72 extern bool ioport_debug; 73 extern int active_console; 74 75 bool do_debug_print = false; 76 77 static int nrcpus; 78 79 static const char * const run_usage[] = { 80 "kvm run [<options>] [<kernel image>]", 81 NULL 82 }; 83 84 static int img_name_parser(const struct option *opt, const char *arg, int unset) 85 { 86 char *sep; 87 88 if (image_count >= MAX_DISK_IMAGES) 89 die("Currently only 4 images are supported"); 90 91 image_filename[image_count] = arg; 92 sep = strstr(arg, ","); 93 if (sep) { 94 if (strcmp(sep + 1, "ro") == 0) 95 readonly_image[image_count] = 1; 96 *sep = 0; 97 } 98 99 image_count++; 100 101 return 0; 102 } 103 104 static const struct option options[] = { 105 OPT_GROUP("Basic options:"), 106 OPT_INTEGER('c', "cpus", &nrcpus, "Number of CPUs"), 107 OPT_U64('m', "mem", &ram_size, "Virtual machine memory size in MiB."), 108 OPT_CALLBACK('d', "disk", NULL, "image", "Disk image", img_name_parser), 109 OPT_STRING('\0', "console", &console, "serial or virtio", 110 "Console to use"), 111 OPT_INCR('\0', "rng", &virtio_rng, 112 "Enable virtio Random Number Generator"), 113 OPT_STRING('\0', "kvm-dev", &kvm_dev, "kvm-dev", "KVM device file"), 114 OPT_STRING('\0', "virtio-9p", &virtio_9p_dir, "root dir", 115 "Enable 9p over virtio"), 116 OPT_BOOLEAN('\0', "vnc", &vnc, "Enable VNC framebuffer"), 117 118 OPT_GROUP("Kernel options:"), 119 OPT_STRING('k', "kernel", &kernel_filename, "kernel", 120 "Kernel to boot in virtual machine"), 121 OPT_STRING('i', "initrd", &initrd_filename, "initrd", 122 "Initial RAM disk image"), 123 OPT_STRING('p', "params", &kernel_cmdline, "params", 124 "Kernel command line arguments"), 125 126 OPT_GROUP("Networking options:"), 127 OPT_STRING('n', "network", &network, "virtio", 128 "Network to use"), 129 OPT_STRING('\0', "host-ip-addr", &host_ip_addr, "a.b.c.d", 130 "Assign this address to the host side networking"), 131 OPT_STRING('\0', "guest-mac", &guest_mac, "aa:bb:cc:dd:ee:ff", 132 "Assign this address to the guest side NIC"), 133 OPT_STRING('\0', "tapscript", &script, "Script path", 134 "Assign a script to process created tap device"), 135 136 OPT_GROUP("Debug options:"), 137 OPT_BOOLEAN('\0', "debug", &do_debug_print, 138 "Enable debug messages"), 139 OPT_BOOLEAN('\0', "debug-single-step", &single_step, 140 "Enable single stepping"), 141 OPT_BOOLEAN('\0', "debug-ioport-debug", &ioport_debug, 142 "Enable ioport debugging"), 143 OPT_END() 144 }; 145 146 /* 147 * Serialize debug printout so that the output of multiple vcpus does not 148 * get mixed up: 149 */ 150 static int printout_done; 151 152 static void handle_sigusr1(int sig) 153 { 154 struct kvm_cpu *cpu = current_kvm_cpu; 155 156 if (!cpu) 157 return; 158 159 printf("\n #\n # vCPU #%ld's dump:\n #\n", cpu->cpu_id); 160 kvm_cpu__show_registers(cpu); 161 kvm_cpu__show_code(cpu); 162 kvm_cpu__show_page_tables(cpu); 163 fflush(stdout); 164 printout_done = 1; 165 mb(); 166 } 167 168 static void handle_sigquit(int sig) 169 { 170 int i; 171 172 for (i = 0; i < nrcpus; i++) { 173 struct kvm_cpu *cpu = kvm_cpus[i]; 174 175 if (!cpu) 176 continue; 177 178 printout_done = 0; 179 pthread_kill(cpu->thread, SIGUSR1); 180 /* 181 * Wait for the vCPU to dump state before signalling 182 * the next thread. Since this is debug code it does 183 * not matter that we are burning CPU time a bit: 184 */ 185 while (!printout_done) 186 mb(); 187 } 188 189 serial8250__inject_sysrq(kvm); 190 } 191 192 static void handle_sigalrm(int sig) 193 { 194 serial8250__inject_interrupt(kvm); 195 virtio_console__inject_interrupt(kvm); 196 } 197 198 static void *kvm_cpu_thread(void *arg) 199 { 200 current_kvm_cpu = arg; 201 202 if (kvm_cpu__start(current_kvm_cpu)) 203 goto panic_kvm; 204 205 kvm_cpu__delete(current_kvm_cpu); 206 207 return (void *) (intptr_t) 0; 208 209 panic_kvm: 210 fprintf(stderr, "KVM exit reason: %u (\"%s\")\n", 211 current_kvm_cpu->kvm_run->exit_reason, 212 kvm_exit_reasons[current_kvm_cpu->kvm_run->exit_reason]); 213 if (current_kvm_cpu->kvm_run->exit_reason == KVM_EXIT_UNKNOWN) 214 fprintf(stderr, "KVM exit code: 0x%Lu\n", 215 current_kvm_cpu->kvm_run->hw.hardware_exit_reason); 216 217 kvm_cpu__show_registers(current_kvm_cpu); 218 kvm_cpu__show_code(current_kvm_cpu); 219 kvm_cpu__show_page_tables(current_kvm_cpu); 220 221 kvm_cpu__delete(current_kvm_cpu); 222 223 return (void *) (intptr_t) 1; 224 } 225 226 static char kernel[PATH_MAX]; 227 228 static const char *host_kernels[] = { 229 "/boot/vmlinuz", 230 "/boot/bzImage", 231 NULL 232 }; 233 234 static const char *default_kernels[] = { 235 "./bzImage", 236 "../../arch/x86/boot/bzImage", 237 NULL 238 }; 239 240 static const char *default_vmlinux[] = { 241 "../../../vmlinux", 242 "../../vmlinux", 243 NULL 244 }; 245 246 static void kernel_usage_with_options(void) 247 { 248 const char **k; 249 struct utsname uts; 250 251 fprintf(stderr, "Fatal: could not find default kernel image in:\n"); 252 k = &default_kernels[0]; 253 while (*k) { 254 fprintf(stderr, "\t%s\n", *k); 255 k++; 256 } 257 258 if (uname(&uts) < 0) 259 return; 260 261 k = &host_kernels[0]; 262 while (*k) { 263 if (snprintf(kernel, PATH_MAX, "%s-%s", *k, uts.release) < 0) 264 return; 265 fprintf(stderr, "\t%s\n", kernel); 266 k++; 267 } 268 fprintf(stderr, "\nPlease see 'kvm run --help' for more options.\n\n"); 269 } 270 271 static u64 host_ram_size(void) 272 { 273 long page_size; 274 long nr_pages; 275 276 nr_pages = sysconf(_SC_PHYS_PAGES); 277 if (nr_pages < 0) { 278 pr_warning("sysconf(_SC_PHYS_PAGES) failed"); 279 return 0; 280 } 281 282 page_size = sysconf(_SC_PAGE_SIZE); 283 if (page_size < 0) { 284 pr_warning("sysconf(_SC_PAGE_SIZE) failed"); 285 return 0; 286 } 287 288 return (nr_pages * page_size) >> MB_SHIFT; 289 } 290 291 /* 292 * If user didn't specify how much memory it wants to allocate for the guest, 293 * avoid filling the whole host RAM. 294 */ 295 #define RAM_SIZE_RATIO 0.8 296 297 static u64 get_ram_size(int nr_cpus) 298 { 299 long available; 300 long ram_size; 301 302 ram_size = 64 * (nr_cpus + 3); 303 304 available = host_ram_size() * RAM_SIZE_RATIO; 305 if (!available) 306 available = MIN_RAM_SIZE_MB; 307 308 if (ram_size > available) 309 ram_size = available; 310 311 return ram_size; 312 } 313 314 static const char *find_kernel(void) 315 { 316 const char **k; 317 struct stat st; 318 struct utsname uts; 319 320 k = &default_kernels[0]; 321 while (*k) { 322 if (stat(*k, &st) < 0 || !S_ISREG(st.st_mode)) { 323 k++; 324 continue; 325 } 326 strncpy(kernel, *k, PATH_MAX); 327 return kernel; 328 } 329 330 if (uname(&uts) < 0) 331 return NULL; 332 333 k = &host_kernels[0]; 334 while (*k) { 335 if (snprintf(kernel, PATH_MAX, "%s-%s", *k, uts.release) < 0) 336 return NULL; 337 338 if (stat(kernel, &st) < 0 || !S_ISREG(st.st_mode)) { 339 k++; 340 continue; 341 } 342 return kernel; 343 344 } 345 return NULL; 346 } 347 348 static const char *find_vmlinux(void) 349 { 350 const char **vmlinux; 351 352 vmlinux = &default_vmlinux[0]; 353 while (*vmlinux) { 354 struct stat st; 355 356 if (stat(*vmlinux, &st) < 0 || !S_ISREG(st.st_mode)) { 357 vmlinux++; 358 continue; 359 } 360 return *vmlinux; 361 } 362 return NULL; 363 } 364 365 static int root_device(char *dev, long *part) 366 { 367 struct stat st; 368 369 if (stat("/", &st) < 0) 370 return -1; 371 372 *part = minor(st.st_dev); 373 374 sprintf(dev, "/dev/block/%u:0", major(st.st_dev)); 375 if (access(dev, R_OK) < 0) 376 return -1; 377 378 return 0; 379 } 380 381 static char *host_image(char *cmd_line, size_t size) 382 { 383 char *t; 384 char device[PATH_MAX]; 385 long part = 0; 386 387 t = malloc(PATH_MAX); 388 if (!t) 389 return NULL; 390 391 /* check for the root file system */ 392 if (root_device(device, &part) < 0) { 393 free(t); 394 return NULL; 395 } 396 strncpy(t, device, PATH_MAX); 397 if (!strstr(cmd_line, "root=")) { 398 char tmp[PATH_MAX]; 399 snprintf(tmp, sizeof(tmp), "root=/dev/vda%ld rw ", part); 400 strlcat(cmd_line, tmp, size); 401 } 402 return t; 403 } 404 405 void kvm_run_help(void) 406 { 407 usage_with_options(run_usage, options); 408 } 409 410 int kvm_cmd_run(int argc, const char **argv, const char *prefix) 411 { 412 struct virtio_net_parameters net_params; 413 static char real_cmdline[2048]; 414 unsigned int nr_online_cpus; 415 int exit_code = 0; 416 int max_cpus; 417 char *hi; 418 int i; 419 void *ret; 420 u16 vidmode = 0; 421 422 signal(SIGALRM, handle_sigalrm); 423 signal(SIGQUIT, handle_sigquit); 424 signal(SIGUSR1, handle_sigusr1); 425 426 nr_online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 427 428 while (argc != 0) { 429 argc = parse_options(argc, argv, options, run_usage, 430 PARSE_OPT_STOP_AT_NON_OPTION); 431 if (argc != 0) { 432 if (kernel_filename) { 433 fprintf(stderr, "Cannot handle parameter: " 434 "%s\n", argv[0]); 435 usage_with_options(run_usage, options); 436 return EINVAL; 437 } 438 /* first unhandled parameter is treated as a kernel 439 image 440 */ 441 kernel_filename = argv[0]; 442 argv++; 443 argc--; 444 } 445 446 } 447 448 if (!kernel_filename) 449 kernel_filename = find_kernel(); 450 451 if (!kernel_filename) { 452 kernel_usage_with_options(); 453 return EINVAL; 454 } 455 456 vmlinux_filename = find_vmlinux(); 457 458 if (nrcpus == 0) 459 nrcpus = nr_online_cpus; 460 else if (nrcpus < 1 || nrcpus > KVM_NR_CPUS) 461 die("Number of CPUs %d is out of [1;%d] range", nrcpus, KVM_NR_CPUS); 462 463 if (!ram_size) 464 ram_size = get_ram_size(nrcpus); 465 466 if (ram_size < MIN_RAM_SIZE_MB) 467 die("Not enough memory specified: %lluMB (min %lluMB)", ram_size, MIN_RAM_SIZE_MB); 468 469 if (ram_size > host_ram_size()) 470 pr_warning("Guest memory size %lluMB exceeds host physical RAM size %lluMB", ram_size, host_ram_size()); 471 472 ram_size <<= MB_SHIFT; 473 474 if (!kvm_dev) 475 kvm_dev = DEFAULT_KVM_DEV; 476 477 if (!console) 478 console = DEFAULT_CONSOLE; 479 480 if (!strncmp(console, "virtio", 6)) 481 active_console = CONSOLE_VIRTIO; 482 else 483 active_console = CONSOLE_8250; 484 485 if (!host_ip_addr) 486 host_ip_addr = DEFAULT_HOST_ADDR; 487 488 if (!guest_mac) 489 guest_mac = DEFAULT_GUEST_MAC; 490 491 if (!script) 492 script = DEFAULT_SCRIPT; 493 494 if (virtio_9p_dir) { 495 char tmp[PATH_MAX]; 496 497 if (realpath(virtio_9p_dir, tmp)) 498 virtio_9p__init(kvm, tmp); 499 else 500 die("Failed resolving 9p path"); 501 } 502 503 symbol__init(vmlinux_filename); 504 505 term_init(); 506 507 kvm = kvm__init(kvm_dev, ram_size); 508 509 ioeventfd__init(); 510 511 max_cpus = kvm__max_cpus(kvm); 512 513 if (nrcpus > max_cpus) { 514 printf(" # Limit the number of CPUs to %d\n", max_cpus); 515 kvm->nrcpus = max_cpus; 516 } 517 518 kvm->nrcpus = nrcpus; 519 520 memset(real_cmdline, 0, sizeof(real_cmdline)); 521 strcpy(real_cmdline, "notsc noapic noacpi pci=conf1"); 522 if (vnc) { 523 strcat(real_cmdline, " video=vesafb console=tty0"); 524 vidmode = 0x312; 525 } else { 526 strcat(real_cmdline, " console=ttyS0 earlyprintk=serial"); 527 } 528 strcat(real_cmdline, " "); 529 if (kernel_cmdline) 530 strlcat(real_cmdline, kernel_cmdline, sizeof(real_cmdline)); 531 532 hi = NULL; 533 if (!image_filename[0]) { 534 hi = host_image(real_cmdline, sizeof(real_cmdline)); 535 if (hi) { 536 image_filename[0] = hi; 537 readonly_image[0] = true; 538 image_count++; 539 } 540 } 541 542 if (!strstr(real_cmdline, "root=")) 543 strlcat(real_cmdline, " root=/dev/vda rw ", sizeof(real_cmdline)); 544 545 if (image_count) { 546 kvm->nr_disks = image_count; 547 kvm->disks = disk_image__open_all(image_filename, readonly_image, image_count); 548 if (!kvm->disks) 549 die("Unable to load all disk images."); 550 551 virtio_blk__init_all(kvm); 552 } 553 554 free(hi); 555 556 printf(" # kvm run -k %s -m %Lu -c %d\n", kernel_filename, ram_size / 1024 / 1024, nrcpus); 557 558 if (!kvm__load_kernel(kvm, kernel_filename, initrd_filename, 559 real_cmdline, vidmode)) 560 die("unable to load kernel %s", kernel_filename); 561 562 kvm->vmlinux = vmlinux_filename; 563 564 ioport__setup_legacy(); 565 566 rtc__init(); 567 568 serial8250__init(kvm); 569 570 pci__init(); 571 572 if (active_console == CONSOLE_VIRTIO) 573 virtio_console__init(kvm); 574 575 if (virtio_rng) 576 while (virtio_rng--) 577 virtio_rng__init(kvm); 578 579 if (!network) 580 network = DEFAULT_NETWORK; 581 582 if (!strncmp(network, "virtio", 6)) { 583 net_params = (struct virtio_net_parameters) { 584 .host_ip = host_ip_addr, 585 .kvm = kvm, 586 .script = script 587 }; 588 sscanf(guest_mac, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", 589 net_params.guest_mac, 590 net_params.guest_mac+1, 591 net_params.guest_mac+2, 592 net_params.guest_mac+3, 593 net_params.guest_mac+4, 594 net_params.guest_mac+5); 595 596 virtio_net__init(&net_params); 597 } 598 599 kvm__start_timer(kvm); 600 601 kvm__setup_bios(kvm); 602 603 for (i = 0; i < nrcpus; i++) { 604 kvm_cpus[i] = kvm_cpu__init(kvm, i); 605 if (!kvm_cpus[i]) 606 die("unable to initialize KVM VCPU"); 607 608 if (single_step) 609 kvm_cpu__enable_singlestep(kvm_cpus[i]); 610 } 611 612 kvm__init_ram(kvm); 613 614 if (vnc) 615 vesa__init(kvm); 616 617 thread_pool__init(nr_online_cpus); 618 ioeventfd__start(); 619 620 for (i = 0; i < nrcpus; i++) { 621 if (pthread_create(&kvm_cpus[i]->thread, NULL, kvm_cpu_thread, kvm_cpus[i]) != 0) 622 die("unable to create KVM VCPU thread"); 623 } 624 625 /* Only VCPU #0 is going to exit by itself when shutting down */ 626 if (pthread_join(kvm_cpus[0]->thread, &ret) != 0) 627 exit_code = 1; 628 629 for (i = 1; i < nrcpus; i++) { 630 pthread_kill(kvm_cpus[i]->thread, SIGKVMEXIT); 631 if (pthread_join(kvm_cpus[i]->thread, &ret) != 0) 632 die("pthread_join"); 633 634 if (ret != NULL) 635 exit_code = 1; 636 } 637 638 virtio_blk__delete_all(kvm); 639 virtio_rng__delete_all(kvm); 640 641 disk_image__close_all(kvm->disks, image_count); 642 kvm__delete(kvm); 643 644 if (!exit_code) 645 printf("\n # KVM session ended normally.\n"); 646 647 return exit_code; 648 } 649