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_sigquit(int sig)

131 {

132 int i;

133

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

135 struct kvm_cpu *cpu = kvm_cpus[i];

136

137 kvm_cpu__show_registers(cpu);

138 kvm_cpu__show_code(cpu);

139 kvm_cpu__show_page_tables(cpu);

140 }

141

142 serial8250__inject_sysrq(kvm);

143 }

144

145 static void handle_sigalrm(int sig)

146 {

147 serial8250__inject_interrupt(kvm);

148 virtio_console__inject_interrupt(kvm);

149 }

150

151 static void *kvm_cpu_thread(void *arg)

152 {

153 current_kvm_cpu = arg;

154

155 if (kvm_cpu__start(current_kvm_cpu))

156 goto panic_kvm;

157

158 kvm_cpu__delete(current_kvm_cpu);

159

160 return (void *) (intptr_t) 0;

161

162 panic_kvm:

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

164 current_kvm_cpu->kvm_run->exit_reason,

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

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

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

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

169

170 kvm_cpu__show_registers(current_kvm_cpu);

171 kvm_cpu__show_code(current_kvm_cpu);

172 kvm_cpu__show_page_tables(current_kvm_cpu);

173

174 kvm_cpu__delete(current_kvm_cpu);

175

176 return (void *) (intptr_t) 1;

177 }

178

179 static char kernel[PATH_MAX];

180 const char *host_kernels[] = {

181 "/boot/vmlinuz",

182 "/boot/bzImage",

183 NULL

184 };

185 const char *default_kernels[] = {

186 "./bzImage",

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

188 NULL

189 };

190

191 static void kernel_usage_with_options(void)

192 {

193 const char **k;

194 struct utsname uts;

195

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

197 k = &default_kernels[0];

198 while (*k) {

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

200 k++;

201 }

202

203 if (uname(&uts) < 0)

204 return;

205

206 k = &host_kernels[0];

207 while (*k) {

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

209 return;

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

211 k++;

212 }

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

214 }

215

216 static u64 host_ram_size(void)

217 {

218 long page_size;

219 long nr_pages;

220

221 nr_pages = sysconf(_SC_PHYS_PAGES);

222

223 page_size = sysconf(_SC_PAGE_SIZE);

224

225 return (nr_pages * page_size) >> MB_SHIFT;

226 }

227

228 /*

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

230 * avoid filling the whole host RAM.

231 */

232 #define RAM_SIZE_RATIO 0.8

233

234 static u64 get_ram_size(int nr_cpus)

235 {

236 long available;

237 long ram_size;

238

239 ram_size = 64 * (nr_cpus + 3);

240

241 available = host_ram_size() * RAM_SIZE_RATIO;

242

243 if (ram_size > available)

244 ram_size = available;

245

246 return ram_size;

247 }

248

249 static const char *find_kernel(void)

250 {

251 const char **k;

252 struct stat st;

253 struct utsname uts;

254

255 k = &default_kernels[0];

256 while (*k) {

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

258 k++;

259 continue;

260 }

261 strncpy(kernel, *k, PATH_MAX);

262 return kernel;

263 }

264

265 if (uname(&uts) < 0)

266 return NULL;

267

268 k = &host_kernels[0];

269 while (*k) {

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

271 return NULL;

272

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

274 k++;

275 continue;

276 }

277 return kernel;

278

279 }

280 return NULL;

281 }

282

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

284 {

285 struct stat st;

286

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

288 return -1;

289

290 *part = minor(st.st_dev);

291

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

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

294 return -1;

295

296 return 0;

297 }

298

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

300 {

301 char *t;

302 char device[PATH_MAX];

303 long part = 0;

304

305 t = malloc(PATH_MAX);

306 if (!t)

307 return NULL;

308

309 /* check for the root file system */

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

311 free(t);

312 return NULL;

313 }

314 strncpy(t, device, PATH_MAX);

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

316 char tmp[PATH_MAX];

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

318 strlcat(cmd_line, tmp, size);

319 }

320 return t;

321 }

322

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

324 {

325 static char real_cmdline[2048];

326 unsigned int nr_online_cpus;

327 int max_cpus;

328 int exit_code = 0;

329 int i;

330 struct virtio_net_parameters net_params;

331 char *hi;

332

333 signal(SIGALRM, handle_sigalrm);

334 signal(SIGQUIT, handle_sigquit);

335

336 while (argc != 0) {

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

338 PARSE_OPT_STOP_AT_NON_OPTION);

339 if (argc != 0) {

340 if (kernel_filename) {

341 fprintf(stderr, "Cannot handle parameter: "

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

343 usage_with_options(run_usage, options);

344 return EINVAL;

345 }

346 /* first unhandled parameter is treated as a kernel

347 image

348 */

349 kernel_filename = argv[0];

350 argv++;

351 argc--;

352 }

353

354 }

355

356 if (!kernel_filename)

357 kernel_filename = find_kernel();

358

359 if (!kernel_filename) {

360 kernel_usage_with_options();

361 return EINVAL;

362 }

363

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

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

366

367 if (!ram_size)

368 ram_size = get_ram_size(nrcpus);

369

370 if (ram_size < MIN_RAM_SIZE_MB)

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

372

373 if (ram_size > host_ram_size())

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

375

376 ram_size <<= MB_SHIFT;

377

378 if (!kvm_dev)

379 kvm_dev = DEFAULT_KVM_DEV;

380

381 if (!console)

382 console = DEFAULT_CONSOLE;

383

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

385 active_console = CONSOLE_VIRTIO;

386 else

387 active_console = CONSOLE_8250;

388

389 if (!host_ip_addr)

390 host_ip_addr = DEFAULT_HOST_ADDR;

391

392 if (!guest_mac)

393 guest_mac = DEFAULT_GUEST_MAC;

394

395 if (!script)

396 script = DEFAULT_SCRIPT;

397

398 term_init();

399

400 kvm = kvm__init(kvm_dev, ram_size);

401

402 max_cpus = kvm__max_cpus(kvm);

403

404 if (nrcpus > max_cpus) {

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

406 kvm->nrcpus = max_cpus;

407 }

408

409 kvm->nrcpus = nrcpus;

410

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

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

413 if (kernel_cmdline)

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

415

416 hi = NULL;

417 if (!image_filename[0]) {

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

419 if (hi) {

420 image_filename[0] = hi;

421 readonly_image[0] = true;

422 image_count++;

423 }

424 }

425

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

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

428

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

430 if (image_filename[i]) {

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

432 if (!disk)

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

434

435 virtio_blk__init(kvm, disk);

436 }

437 }

438 free(hi);

439

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

441 real_cmdline))

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

443

444 ioport__setup_legacy();

445

446 rtc__init();

447

448 serial8250__init(kvm);

449

450 pci__init();

451

452 if (active_console == CONSOLE_VIRTIO)

453 virtio_console__init(kvm);

454

455 if (virtio_rng)

456 virtio_rng__init(kvm);

457

458 if (!network)

459 network = DEFAULT_NETWORK;

460

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

462 net_params = (struct virtio_net_parameters) {

463 .host_ip = host_ip_addr,

464 .self = kvm,

465 .script = script

466 };

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

468 net_params.guest_mac,

469 net_params.guest_mac+1,

470 net_params.guest_mac+2,

471 net_params.guest_mac+3,

472 net_params.guest_mac+4,

473 net_params.guest_mac+5);

474

475 virtio_net__init(&net_params);

476 }

477

478 kvm__start_timer(kvm);

479

480 kvm__setup_bios(kvm);

481

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

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

484 if (!kvm_cpus[i])

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

486

487 if (single_step)

488 kvm_cpu__enable_singlestep(kvm_cpus[i]);

489 }

490

491 kvm__init_ram(kvm);

492

493 nr_online_cpus = sysconf(_SC_NPROCESSORS_ONLN);

494 thread_pool__init(nr_online_cpus);

495

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

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

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

499 }

500

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

502 void *ret;

503

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

505 die("pthread_join");

506

507 if (ret != NULL)

508 exit_code = 1;

509 }

510

511 kvm__delete(kvm);

512

513 if (!exit_code)

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

515

516 return exit_code;

517 }