git.karo-electronics.de Git - karo-tx-linux.git/blob

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>

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>

29 /* header files for gitish interface */

30 #include <kvm/kvm-run.h>

31 #include <kvm/parse-options.h>

33 #define DEFAULT_KVM_DEV "/dev/kvm"

34 #define DEFAULT_CONSOLE "serial"

35 #define DEFAULT_NETWORK "virtio"

36 #define DEFAULT_HOST_ADDR "192.168.33.2"

37 #define DEFAULT_GUEST_MAC "00:11:22:33:44:55"

38 #define DEFAULT_SCRIPT "none"

40 #define MB_SHIFT (20)

41 #define MIN_RAM_SIZE_MB (64ULL)

42 #define MIN_RAM_SIZE_BYTE (MIN_RAM_SIZE_MB << MB_SHIFT)

43 #define MAX_DISK_IMAGES 4

45 static struct kvm *kvm;

46 static struct kvm_cpu *kvm_cpus[KVM_NR_CPUS];

47 static __thread struct kvm_cpu *current_kvm_cpu;

49 static u64 ram_size;

50 static u8 image_count;

51 static const char *kernel_cmdline;

52 static const char *kernel_filename;

53 static const char *initrd_filename;

54 static const char *image_filename[MAX_DISK_IMAGES];

55 static const char *console;

56 static const char *kvm_dev;

57 static const char *network;

58 static const char *host_ip_addr;

59 static const char *guest_mac;

60 static const char *script;

61 static bool single_step;

62 static bool readonly_image[MAX_DISK_IMAGES];

63 static bool virtio_rng;

64 extern bool ioport_debug;

65 extern int active_console;

67 static int nrcpus = 1;

69 static const char * const run_usage[] = {

70 "kvm run [<options>] [<kernel image>]",

71 NULL

72 };

74 static int img_name_parser(const struct option *opt, const char *arg, int unset)

75 {

76 char *sep;

78 if (image_count >= MAX_DISK_IMAGES)

79 die("Currently only 4 images are supported");

81 image_filename[image_count] = arg;

82 sep = strstr(arg, ",");

83 if (sep) {

84 if (strcmp(sep + 1, "ro") == 0)

85 readonly_image[image_count] = 1;

86 *sep = 0;

87 }

89 image_count++;

91 return 0;

92 }

94 static const struct option options[] = {

95 OPT_GROUP("Basic options:"),

96 OPT_INTEGER('\0', "cpus", &nrcpus, "Number of CPUs"),

97 OPT_U64('m', "mem", &ram_size, "Virtual machine memory size in MiB."),

98 OPT_CALLBACK('i', "image", NULL, "image", "Disk image", img_name_parser),

99 OPT_STRING('c', "console", &console, "serial or virtio",

100 "Console to use"),

101 OPT_BOOLEAN('\0', "virtio-rng", &virtio_rng,

102 "Enable virtio Random Number Generator"),

103

104 OPT_GROUP("Kernel options:"),

105 OPT_STRING('k', "kernel", &kernel_filename, "kernel",

106 "Kernel to boot in virtual machine"),

107 OPT_STRING('r', "initrd", &initrd_filename, "initrd",

108 "Initial RAM disk image"),

109 OPT_STRING('p', "params", &kernel_cmdline, "params",

110 "Kernel command line arguments"),

111

112 OPT_GROUP("Networking options:"),

113 OPT_STRING('n', "network", &network, "virtio",

114 "Network to use"),

115 OPT_STRING('\0', "host-ip-addr", &host_ip_addr, "a.b.c.d",

116 "Assign this address to the host side networking"),

117 OPT_STRING('\0', "guest-mac", &guest_mac, "aa:bb:cc:dd:ee:ff",

118 "Assign this address to the guest side NIC"),

119 OPT_STRING('\0', "tapscript", &script, "Script path",

120 "Assign a script to process created tap device"),

121 OPT_GROUP("Debug options:"),

122 OPT_STRING('d', "kvm-dev", &kvm_dev, "kvm-dev", "KVM device file"),

123 OPT_BOOLEAN('s', "single-step", &single_step,

124 "Enable single stepping"),

125 OPT_BOOLEAN('g', "ioport-debug", &ioport_debug,

126 "Enable ioport debugging"),

127 OPT_END()

128 };

129

130 static void handle_sigusr1(int sig)

131 {

132 struct kvm_cpu *cpu = current_kvm_cpu;

133

134 if (!cpu)

135 return;

136

137 kvm_cpu__show_registers(cpu);

138 kvm_cpu__show_code(cpu);

139 kvm_cpu__show_page_tables(cpu);

140 }

141

142 static void handle_sigquit(int sig)

143 {

144 int i;

145

146 for (i = 0; i < nrcpus; i++) {

147 struct kvm_cpu *cpu = kvm_cpus[i];

148

149 if (!cpu)

150 continue;

151

152 pthread_kill(cpu->thread, SIGUSR1);

153 }

154

155 serial8250__inject_sysrq(kvm);

156 }

157

158 static void handle_sigalrm(int sig)

159 {

160 serial8250__inject_interrupt(kvm);

161 virtio_console__inject_interrupt(kvm);

162 }

163

164 static void *kvm_cpu_thread(void *arg)

165 {

166 current_kvm_cpu = arg;

167

168 if (kvm_cpu__start(current_kvm_cpu))

169 goto panic_kvm;

170

171 kvm_cpu__delete(current_kvm_cpu);

172

173 return (void *) (intptr_t) 0;

174

175 panic_kvm:

176 fprintf(stderr, "KVM exit reason: %u (\"%s\")\n",

177 current_kvm_cpu->kvm_run->exit_reason,

178 kvm_exit_reasons[current_kvm_cpu->kvm_run->exit_reason]);

179 if (current_kvm_cpu->kvm_run->exit_reason == KVM_EXIT_UNKNOWN)

180 fprintf(stderr, "KVM exit code: 0x%Lu\n",

181 current_kvm_cpu->kvm_run->hw.hardware_exit_reason);

182

183 kvm_cpu__show_registers(current_kvm_cpu);

184 kvm_cpu__show_code(current_kvm_cpu);

185 kvm_cpu__show_page_tables(current_kvm_cpu);

186

187 kvm_cpu__delete(current_kvm_cpu);

188

189 return (void *) (intptr_t) 1;

190 }

191

192 static char kernel[PATH_MAX];

193 const char *host_kernels[] = {

194 "/boot/vmlinuz",

195 "/boot/bzImage",

196 NULL

197 };

198 const char *default_kernels[] = {

199 "./bzImage",

200 "../../arch/x86/boot/bzImage",

201 NULL

202 };

203

204 static void kernel_usage_with_options(void)

205 {

206 const char **k;

207 struct utsname uts;

208

209 fprintf(stderr, "Fatal: could not find default kernel image in:\n");

210 k = &default_kernels[0];

211 while (*k) {

212 fprintf(stderr, "\t%s\n", *k);

213 k++;

214 }

215

216 if (uname(&uts) < 0)

217 return;

218

219 k = &host_kernels[0];

220 while (*k) {

221 if (snprintf(kernel, PATH_MAX, "%s-%s", *k, uts.release) < 0)

222 return;

223 fprintf(stderr, "\t%s\n", kernel);

224 k++;

225 }

226 fprintf(stderr, "\nPlease see 'kvm run --help' for more options.\n\n");

227 }

228

229 static u64 host_ram_size(void)

230 {

231 long page_size;

232 long nr_pages;

233

234 nr_pages = sysconf(_SC_PHYS_PAGES);

235

236 page_size = sysconf(_SC_PAGE_SIZE);

237

238 return (nr_pages * page_size) >> MB_SHIFT;

239 }

240

241 /*

242 * If user didn't specify how much memory it wants to allocate for the guest,

243 * avoid filling the whole host RAM.

244 */

245 #define RAM_SIZE_RATIO 0.8

246

247 static u64 get_ram_size(int nr_cpus)

248 {

249 long available;

250 long ram_size;

251

252 ram_size = 64 * (nr_cpus + 3);

253

254 available = host_ram_size() * RAM_SIZE_RATIO;

255

256 if (ram_size > available)

257 ram_size = available;

258

259 return ram_size;

260 }

261

262 static const char *find_kernel(void)

263 {

264 const char **k;

265 struct stat st;

266 struct utsname uts;

267

268 k = &default_kernels[0];

269 while (*k) {

270 if (stat(*k, &st) < 0 || !S_ISREG(st.st_mode)) {

271 k++;

272 continue;

273 }

274 strncpy(kernel, *k, PATH_MAX);

275 return kernel;

276 }

277

278 if (uname(&uts) < 0)

279 return NULL;

280

281 k = &host_kernels[0];

282 while (*k) {

283 if (snprintf(kernel, PATH_MAX, "%s-%s", *k, uts.release) < 0)

284 return NULL;

285

286 if (stat(kernel, &st) < 0 || !S_ISREG(st.st_mode)) {

287 k++;

288 continue;

289 }

290 return kernel;

291

292 }

293 return NULL;

294 }

295

296 static int root_device(char *dev, long *part)

297 {

298 struct stat st;

299

300 if (stat("/", &st) < 0)

301 return -1;

302

303 *part = minor(st.st_dev);

304

305 sprintf(dev, "/dev/block/%u:0", major(st.st_dev));

306 if (access(dev, R_OK) < 0)

307 return -1;

308

309 return 0;

310 }

311

312 static char *host_image(char *cmd_line, size_t size)

313 {

314 char *t;

315 char device[PATH_MAX];

316 long part = 0;

317

318 t = malloc(PATH_MAX);

319 if (!t)

320 return NULL;

321

322 /* check for the root file system */

323 if (root_device(device, &part) < 0) {

324 free(t);

325 return NULL;

326 }

327 strncpy(t, device, PATH_MAX);

328 if (!strstr(cmd_line, "root=")) {

329 char tmp[PATH_MAX];

330 snprintf(tmp, sizeof(tmp), "root=/dev/vda%ld rw ", part);

331 strlcat(cmd_line, tmp, size);

332 }

333 return t;

334 }

335

336 int kvm_cmd_run(int argc, const char **argv, const char *prefix)

337 {

338 static char real_cmdline[2048];

339 unsigned int nr_online_cpus;

340 int max_cpus;

341 int exit_code = 0;

342 int i;

343 struct virtio_net_parameters net_params;

344 char *hi;

345

346 signal(SIGALRM, handle_sigalrm);

347 signal(SIGQUIT, handle_sigquit);

348 signal(SIGUSR1, handle_sigusr1);

349

350 while (argc != 0) {

351 argc = parse_options(argc, argv, options, run_usage,

352 PARSE_OPT_STOP_AT_NON_OPTION);

353 if (argc != 0) {

354 if (kernel_filename) {

355 fprintf(stderr, "Cannot handle parameter: "

356 "%s\n", argv[0]);

357 usage_with_options(run_usage, options);

358 return EINVAL;

359 }

360 /* first unhandled parameter is treated as a kernel

361 image

362 */

363 kernel_filename = argv[0];

364 argv++;

365 argc--;

366 }

367

368 }

369

370 if (!kernel_filename)

371 kernel_filename = find_kernel();

372

373 if (!kernel_filename) {

374 kernel_usage_with_options();

375 return EINVAL;

376 }

377

378 if (nrcpus < 1 || nrcpus > KVM_NR_CPUS)

379 die("Number of CPUs %d is out of [1;%d] range", nrcpus, KVM_NR_CPUS);

380

381 if (!ram_size)

382 ram_size = get_ram_size(nrcpus);

383

384 if (ram_size < MIN_RAM_SIZE_MB)

385 die("Not enough memory specified: %lluMB (min %lluMB)", ram_size, MIN_RAM_SIZE_MB);

386

387 if (ram_size > host_ram_size())

388 warning("Guest memory size %lluMB exceeds host physical RAM size %lluMB", ram_size, host_ram_size());

389

390 ram_size <<= MB_SHIFT;

391

392 if (!kvm_dev)

393 kvm_dev = DEFAULT_KVM_DEV;

394

395 if (!console)

396 console = DEFAULT_CONSOLE;

397

398 if (!strncmp(console, "virtio", 6))

399 active_console = CONSOLE_VIRTIO;

400 else

401 active_console = CONSOLE_8250;

402

403 if (!host_ip_addr)

404 host_ip_addr = DEFAULT_HOST_ADDR;

405

406 if (!guest_mac)

407 guest_mac = DEFAULT_GUEST_MAC;

408

409 if (!script)

410 script = DEFAULT_SCRIPT;

411

412 term_init();

413

414 kvm = kvm__init(kvm_dev, ram_size);

415

416 max_cpus = kvm__max_cpus(kvm);

417

418 if (nrcpus > max_cpus) {

419 printf(" # Limit the number of CPUs to %d\n", max_cpus);

420 kvm->nrcpus = max_cpus;

421 }

422

423 kvm->nrcpus = nrcpus;

424

425 memset(real_cmdline, 0, sizeof(real_cmdline));

426 strcpy(real_cmdline, "notsc noapic noacpi pci=conf1 console=ttyS0 earlyprintk=serial");

427 if (kernel_cmdline)

428 strlcat(real_cmdline, kernel_cmdline, sizeof(real_cmdline));

429

430 hi = NULL;

431 if (!image_filename[0]) {

432 hi = host_image(real_cmdline, sizeof(real_cmdline));

433 if (hi) {

434 image_filename[0] = hi;

435 readonly_image[0] = true;

436 image_count++;

437 }

438 }

439

440 if (!strstr(real_cmdline, "root="))

441 strlcat(real_cmdline, " root=/dev/vda rw ", sizeof(real_cmdline));

442

443 for (i = 0; i < image_count; i++) {

444 if (image_filename[i]) {

445 struct disk_image *disk = disk_image__open(image_filename[i], readonly_image[i]);

446 if (!disk)

447 die("unable to load disk image %s", image_filename[i]);

448

449 virtio_blk__init(kvm, disk);

450 }

451 }

452 free(hi);

453

454 if (!kvm__load_kernel(kvm, kernel_filename, initrd_filename,

455 real_cmdline))

456 die("unable to load kernel %s", kernel_filename);

457

458 ioport__setup_legacy();

459

460 rtc__init();

461

462 serial8250__init(kvm);

463

464 pci__init();

465

466 if (active_console == CONSOLE_VIRTIO)

467 virtio_console__init(kvm);

468

469 if (virtio_rng)

470 virtio_rng__init(kvm);

471

472 if (!network)

473 network = DEFAULT_NETWORK;

474

475 if (!strncmp(network, "virtio", 6)) {

476 net_params = (struct virtio_net_parameters) {

477 .host_ip = host_ip_addr,

478 .self = kvm,

479 .script = script

480 };

481 sscanf(guest_mac, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",

482 net_params.guest_mac,

483 net_params.guest_mac+1,

484 net_params.guest_mac+2,

485 net_params.guest_mac+3,

486 net_params.guest_mac+4,

487 net_params.guest_mac+5);

488

489 virtio_net__init(&net_params);

490 }

491

492 kvm__start_timer(kvm);

493

494 kvm__setup_bios(kvm);

495

496 for (i = 0; i < nrcpus; i++) {

497 kvm_cpus[i] = kvm_cpu__init(kvm, i);

498 if (!kvm_cpus[i])

499 die("unable to initialize KVM VCPU");

500

501 if (single_step)

502 kvm_cpu__enable_singlestep(kvm_cpus[i]);

503 }

504

505 kvm__init_ram(kvm);

506

507 nr_online_cpus = sysconf(_SC_NPROCESSORS_ONLN);

508 thread_pool__init(nr_online_cpus);

509

510 for (i = 0; i < nrcpus; i++) {

511 if (pthread_create(&kvm_cpus[i]->thread, NULL, kvm_cpu_thread, kvm_cpus[i]) != 0)

512 die("unable to create KVM VCPU thread");

513 }

514

515 for (i = 0; i < nrcpus; i++) {

516 void *ret;

517

518 if (pthread_join(kvm_cpus[i]->thread, &ret) != 0)

519 die("pthread_join");

520

521 if (ret != NULL)

522 exit_code = 1;

523 }

524

525 kvm__delete(kvm);

526

527 if (!exit_code)

528 printf("\n # KVM session ended normally.\n");

529

530 return exit_code;

531 }