tests/test-vmstate.c

   1 /*
   2  *  Test code for VMState
   3  *
   4  *  Copyright (c) 2013 Red Hat Inc.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26
  27 #include "qemu-common.h"
  28 #include "migration/migration.h"
  29 #include "migration/vmstate.h"
  30 #include "qemu/coroutine.h"
  31 #include "io/channel-file.h"
  32
  33 static char temp_file[] = "/tmp/vmst.test.XXXXXX";
  34 static int temp_fd;
  35
  36 /* Fake yield_until_fd_readable() implementation so we don't have to pull the
  37  * coroutine code as dependency.
  38  */
  39 void yield_until_fd_readable(int fd)
  40 {
  41     fd_set fds;
  42     FD_ZERO(&fds);
  43     FD_SET(fd, &fds);
  44     select(fd + 1, &fds, NULL, NULL, NULL);
  45 }
  46
  47
  48 /* Duplicate temp_fd and seek to the beginning of the file */
  49 static QEMUFile *open_test_file(bool write)
  50 {
  51     int fd = dup(temp_fd);
  52     QIOChannel *ioc;
  53     QEMUFile *f;
  54
  55     lseek(fd, 0, SEEK_SET);
  56     if (write) {
  57         g_assert_cmpint(ftruncate(fd, 0), ==, 0);
  58     }
  59     ioc = QIO_CHANNEL(qio_channel_file_new_fd(fd));
  60     if (write) {
  61         f = qemu_fopen_channel_output(ioc);
  62     } else {
  63         f = qemu_fopen_channel_input(ioc);
  64     }
  65     object_unref(OBJECT(ioc));
  66     return f;
  67 }
  68
  69 #define SUCCESS(val) \
  70     g_assert_cmpint((val), ==, 0)
  71
  72 #define FAILURE(val) \
  73     g_assert_cmpint((val), !=, 0)
  74
  75 static void save_vmstate(const VMStateDescription *desc, void *obj)
  76 {
  77     QEMUFile *f = open_test_file(true);
  78
  79     /* Save file with vmstate */
  80     vmstate_save_state(f, desc, obj, NULL);
  81     qemu_put_byte(f, QEMU_VM_EOF);
  82     g_assert(!qemu_file_get_error(f));
  83     qemu_fclose(f);
  84 }
  85
  86 static void compare_vmstate(uint8_t *wire, size_t size)
  87 {
  88     QEMUFile *f = open_test_file(false);
  89     uint8_t result[size];
  90
  91     /* read back as binary */
  92
  93     g_assert_cmpint(qemu_get_buffer(f, result, sizeof(result)), ==,
  94                     sizeof(result));
  95     g_assert(!qemu_file_get_error(f));
  96
  97     /* Compare that what is on the file is the same that what we
  98        expected to be there */
  99     SUCCESS(memcmp(result, wire, sizeof(result)));
 100
 101     /* Must reach EOF */
 102     qemu_get_byte(f);
 103     g_assert_cmpint(qemu_file_get_error(f), ==, -EIO);
 104
 105     qemu_fclose(f);
 106 }
 107
 108 static int load_vmstate_one(const VMStateDescription *desc, void *obj,
 109                             int version, uint8_t *wire, size_t size)
 110 {
 111     QEMUFile *f;
 112     int ret;
 113
 114     f = open_test_file(true);
 115     qemu_put_buffer(f, wire, size);
 116     qemu_fclose(f);
 117
 118     f = open_test_file(false);
 119     ret = vmstate_load_state(f, desc, obj, version);
 120     if (ret) {
 121         g_assert(qemu_file_get_error(f));
 122     } else{
 123         g_assert(!qemu_file_get_error(f));
 124     }
 125     qemu_fclose(f);
 126     return ret;
 127 }
 128
 129
 130 static int load_vmstate(const VMStateDescription *desc,
 131                         void *obj, void *obj_clone,
 132                         void (*obj_copy)(void *, void*),
 133                         int version, uint8_t *wire, size_t size)
 134 {
 135     /* We test with zero size */
 136     obj_copy(obj_clone, obj);
 137     FAILURE(load_vmstate_one(desc, obj, version, wire, 0));
 138
 139     /* Stream ends with QEMU_EOF, so we need at least 3 bytes to be
 140      * able to test in the middle */
 141
 142     if (size > 3) {
 143
 144         /* We test with size - 2. We can't test size - 1 due to EOF tricks */
 145         obj_copy(obj, obj_clone);
 146         FAILURE(load_vmstate_one(desc, obj, version, wire, size - 2));
 147
 148         /* Test with size/2, first half of real state */
 149         obj_copy(obj, obj_clone);
 150         FAILURE(load_vmstate_one(desc, obj, version, wire, size/2));
 151
 152         /* Test with size/2, second half of real state */
 153         obj_copy(obj, obj_clone);
 154         FAILURE(load_vmstate_one(desc, obj, version, wire + (size/2), size/2));
 155
 156     }
 157     obj_copy(obj, obj_clone);
 158     return load_vmstate_one(desc, obj, version, wire, size);
 159 }
 160
 161 /* Test struct that we are going to use for our tests */
 162
 163 typedef struct TestSimple {
 164     bool     b_1,   b_2;
 165     uint8_t  u8_1;
 166     uint16_t u16_1;
 167     uint32_t u32_1;
 168     uint64_t u64_1;
 169     int8_t   i8_1,  i8_2;
 170     int16_t  i16_1, i16_2;
 171     int32_t  i32_1, i32_2;
 172     int64_t  i64_1, i64_2;
 173 } TestSimple;
 174
 175 /* Object instantiation, we are going to use it in more than one test */
 176
 177 TestSimple obj_simple = {
 178     .b_1 = true,
 179     .b_2 = false,
 180     .u8_1 = 130,
 181     .u16_1 = 512,
 182     .u32_1 = 70000,
 183     .u64_1 = 12121212,
 184     .i8_1 = 65,
 185     .i8_2 = -65,
 186     .i16_1 = 512,
 187     .i16_2 = -512,
 188     .i32_1 = 70000,
 189     .i32_2 = -70000,
 190     .i64_1 = 12121212,
 191     .i64_2 = -12121212,
 192 };
 193
 194 /* Description of the values.  If you add a primitive type
 195    you are expected to add a test here */
 196
 197 static const VMStateDescription vmstate_simple_primitive = {
 198     .name = "simple/primitive",
 199     .version_id = 1,
 200     .minimum_version_id = 1,
 201     .fields = (VMStateField[]) {
 202         VMSTATE_BOOL(b_1, TestSimple),
 203         VMSTATE_BOOL(b_2, TestSimple),
 204         VMSTATE_UINT8(u8_1, TestSimple),
 205         VMSTATE_UINT16(u16_1, TestSimple),
 206         VMSTATE_UINT32(u32_1, TestSimple),
 207         VMSTATE_UINT64(u64_1, TestSimple),
 208         VMSTATE_INT8(i8_1, TestSimple),
 209         VMSTATE_INT8(i8_2, TestSimple),
 210         VMSTATE_INT16(i16_1, TestSimple),
 211         VMSTATE_INT16(i16_2, TestSimple),
 212         VMSTATE_INT32(i32_1, TestSimple),
 213         VMSTATE_INT32(i32_2, TestSimple),
 214         VMSTATE_INT64(i64_1, TestSimple),
 215         VMSTATE_INT64(i64_2, TestSimple),
 216         VMSTATE_END_OF_LIST()
 217     }
 218 };
 219
 220 /* It describes what goes through the wire.  Our tests are basically:
 221
 222    * save test
 223      - save a struct a vmstate to a file
 224      - read that file back (binary read, no vmstate)
 225      - compare it with what we expect to be on the wire
 226    * load test
 227      - save to the file what we expect to be on the wire
 228      - read struct back with vmstate in a different
 229      - compare back with the original struct
 230 */
 231
 232 uint8_t wire_simple_primitive[] = {
 233     /* b_1 */   0x01,
 234     /* b_2 */   0x00,
 235     /* u8_1 */  0x82,
 236     /* u16_1 */ 0x02, 0x00,
 237     /* u32_1 */ 0x00, 0x01, 0x11, 0x70,
 238     /* u64_1 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0xb8, 0xf4, 0x7c,
 239     /* i8_1 */  0x41,
 240     /* i8_2 */  0xbf,
 241     /* i16_1 */ 0x02, 0x00,
 242     /* i16_2 */ 0xfe, 0x0,
 243     /* i32_1 */ 0x00, 0x01, 0x11, 0x70,
 244     /* i32_2 */ 0xff, 0xfe, 0xee, 0x90,
 245     /* i64_1 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0xb8, 0xf4, 0x7c,
 246     /* i64_2 */ 0xff, 0xff, 0xff, 0xff, 0xff, 0x47, 0x0b, 0x84,
 247     QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
 248 };
 249
 250 static void obj_simple_copy(void *target, void *source)
 251 {
 252     memcpy(target, source, sizeof(TestSimple));
 253 }
 254
 255 static void test_simple_primitive(void)
 256 {
 257     TestSimple obj, obj_clone;
 258
 259     memset(&obj, 0, sizeof(obj));
 260     save_vmstate(&vmstate_simple_primitive, &obj_simple);
 261
 262     compare_vmstate(wire_simple_primitive, sizeof(wire_simple_primitive));
 263
 264     SUCCESS(load_vmstate(&vmstate_simple_primitive, &obj, &obj_clone,
 265                          obj_simple_copy, 1, wire_simple_primitive,
 266                          sizeof(wire_simple_primitive)));
 267
 268 #define FIELD_EQUAL(name)   g_assert_cmpint(obj.name, ==, obj_simple.name)
 269
 270     FIELD_EQUAL(b_1);
 271     FIELD_EQUAL(b_2);
 272     FIELD_EQUAL(u8_1);
 273     FIELD_EQUAL(u16_1);
 274     FIELD_EQUAL(u32_1);
 275     FIELD_EQUAL(u64_1);
 276     FIELD_EQUAL(i8_1);
 277     FIELD_EQUAL(i8_2);
 278     FIELD_EQUAL(i16_1);
 279     FIELD_EQUAL(i16_2);
 280     FIELD_EQUAL(i32_1);
 281     FIELD_EQUAL(i32_2);
 282     FIELD_EQUAL(i64_1);
 283     FIELD_EQUAL(i64_2);
 284 }
 285 #undef FIELD_EQUAL
 286
 287 typedef struct TestStruct {
 288     uint32_t a, b, c, e;
 289     uint64_t d, f;
 290     bool skip_c_e;
 291 } TestStruct;
 292
 293 static const VMStateDescription vmstate_versioned = {
 294     .name = "test/versioned",
 295     .version_id = 2,
 296     .minimum_version_id = 1,
 297     .fields = (VMStateField[]) {
 298         VMSTATE_UINT32(a, TestStruct),
 299         VMSTATE_UINT32_V(b, TestStruct, 2), /* Versioned field in the middle, so
 300                                              * we catch bugs more easily.
 301                                              */
 302         VMSTATE_UINT32(c, TestStruct),
 303         VMSTATE_UINT64(d, TestStruct),
 304         VMSTATE_UINT32_V(e, TestStruct, 2),
 305         VMSTATE_UINT64_V(f, TestStruct, 2),
 306         VMSTATE_END_OF_LIST()
 307     }
 308 };
 309
 310 static void test_load_v1(void)
 311 {
 312     QEMUFile *fsave = open_test_file(true);
 313     uint8_t buf[] = {
 314         0, 0, 0, 10,             /* a */
 315         0, 0, 0, 30,             /* c */
 316         0, 0, 0, 0, 0, 0, 0, 40, /* d */
 317         QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
 318     };
 319     qemu_put_buffer(fsave, buf, sizeof(buf));
 320     qemu_fclose(fsave);
 321
 322     QEMUFile *loading = open_test_file(false);
 323     TestStruct obj = { .b = 200, .e = 500, .f = 600 };
 324     vmstate_load_state(loading, &vmstate_versioned, &obj, 1);
 325     g_assert(!qemu_file_get_error(loading));
 326     g_assert_cmpint(obj.a, ==, 10);
 327     g_assert_cmpint(obj.b, ==, 200);
 328     g_assert_cmpint(obj.c, ==, 30);
 329     g_assert_cmpint(obj.d, ==, 40);
 330     g_assert_cmpint(obj.e, ==, 500);
 331     g_assert_cmpint(obj.f, ==, 600);
 332     qemu_fclose(loading);
 333 }
 334
 335 static void test_load_v2(void)
 336 {
 337     QEMUFile *fsave = open_test_file(true);
 338     uint8_t buf[] = {
 339         0, 0, 0, 10,             /* a */
 340         0, 0, 0, 20,             /* b */
 341         0, 0, 0, 30,             /* c */
 342         0, 0, 0, 0, 0, 0, 0, 40, /* d */
 343         0, 0, 0, 50,             /* e */
 344         0, 0, 0, 0, 0, 0, 0, 60, /* f */
 345         QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
 346     };
 347     qemu_put_buffer(fsave, buf, sizeof(buf));
 348     qemu_fclose(fsave);
 349
 350     QEMUFile *loading = open_test_file(false);
 351     TestStruct obj;
 352     vmstate_load_state(loading, &vmstate_versioned, &obj, 2);
 353     g_assert_cmpint(obj.a, ==, 10);
 354     g_assert_cmpint(obj.b, ==, 20);
 355     g_assert_cmpint(obj.c, ==, 30);
 356     g_assert_cmpint(obj.d, ==, 40);
 357     g_assert_cmpint(obj.e, ==, 50);
 358     g_assert_cmpint(obj.f, ==, 60);
 359     qemu_fclose(loading);
 360 }
 361
 362 static bool test_skip(void *opaque, int version_id)
 363 {
 364     TestStruct *t = (TestStruct *)opaque;
 365     return !t->skip_c_e;
 366 }
 367
 368 static const VMStateDescription vmstate_skipping = {
 369     .name = "test/skip",
 370     .version_id = 2,
 371     .minimum_version_id = 1,
 372     .fields = (VMStateField[]) {
 373         VMSTATE_UINT32(a, TestStruct),
 374         VMSTATE_UINT32(b, TestStruct),
 375         VMSTATE_UINT32_TEST(c, TestStruct, test_skip),
 376         VMSTATE_UINT64(d, TestStruct),
 377         VMSTATE_UINT32_TEST(e, TestStruct, test_skip),
 378         VMSTATE_UINT64_V(f, TestStruct, 2),
 379         VMSTATE_END_OF_LIST()
 380     }
 381 };
 382
 383
 384 static void test_save_noskip(void)
 385 {
 386     QEMUFile *fsave = open_test_file(true);
 387     TestStruct obj = { .a = 1, .b = 2, .c = 3, .d = 4, .e = 5, .f = 6,
 388                        .skip_c_e = false };
 389     vmstate_save_state(fsave, &vmstate_skipping, &obj, NULL);
 390     g_assert(!qemu_file_get_error(fsave));
 391
 392     uint8_t expected[] = {
 393         0, 0, 0, 1,             /* a */
 394         0, 0, 0, 2,             /* b */
 395         0, 0, 0, 3,             /* c */
 396         0, 0, 0, 0, 0, 0, 0, 4, /* d */
 397         0, 0, 0, 5,             /* e */
 398         0, 0, 0, 0, 0, 0, 0, 6, /* f */
 399     };
 400
 401     qemu_fclose(fsave);
 402     compare_vmstate(expected, sizeof(expected));
 403 }
 404
 405 static void test_save_skip(void)
 406 {
 407     QEMUFile *fsave = open_test_file(true);
 408     TestStruct obj = { .a = 1, .b = 2, .c = 3, .d = 4, .e = 5, .f = 6,
 409                        .skip_c_e = true };
 410     vmstate_save_state(fsave, &vmstate_skipping, &obj, NULL);
 411     g_assert(!qemu_file_get_error(fsave));
 412
 413     uint8_t expected[] = {
 414         0, 0, 0, 1,             /* a */
 415         0, 0, 0, 2,             /* b */
 416         0, 0, 0, 0, 0, 0, 0, 4, /* d */
 417         0, 0, 0, 0, 0, 0, 0, 6, /* f */
 418     };
 419
 420     qemu_fclose(fsave);
 421     compare_vmstate(expected, sizeof(expected));
 422 }
 423
 424 static void test_load_noskip(void)
 425 {
 426     QEMUFile *fsave = open_test_file(true);
 427     uint8_t buf[] = {
 428         0, 0, 0, 10,             /* a */
 429         0, 0, 0, 20,             /* b */
 430         0, 0, 0, 30,             /* c */
 431         0, 0, 0, 0, 0, 0, 0, 40, /* d */
 432         0, 0, 0, 50,             /* e */
 433         0, 0, 0, 0, 0, 0, 0, 60, /* f */
 434         QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
 435     };
 436     qemu_put_buffer(fsave, buf, sizeof(buf));
 437     qemu_fclose(fsave);
 438
 439     QEMUFile *loading = open_test_file(false);
 440     TestStruct obj = { .skip_c_e = false };
 441     vmstate_load_state(loading, &vmstate_skipping, &obj, 2);
 442     g_assert(!qemu_file_get_error(loading));
 443     g_assert_cmpint(obj.a, ==, 10);
 444     g_assert_cmpint(obj.b, ==, 20);
 445     g_assert_cmpint(obj.c, ==, 30);
 446     g_assert_cmpint(obj.d, ==, 40);
 447     g_assert_cmpint(obj.e, ==, 50);
 448     g_assert_cmpint(obj.f, ==, 60);
 449     qemu_fclose(loading);
 450 }
 451
 452 static void test_load_skip(void)
 453 {
 454     QEMUFile *fsave = open_test_file(true);
 455     uint8_t buf[] = {
 456         0, 0, 0, 10,             /* a */
 457         0, 0, 0, 20,             /* b */
 458         0, 0, 0, 0, 0, 0, 0, 40, /* d */
 459         0, 0, 0, 0, 0, 0, 0, 60, /* f */
 460         QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
 461     };
 462     qemu_put_buffer(fsave, buf, sizeof(buf));
 463     qemu_fclose(fsave);
 464
 465     QEMUFile *loading = open_test_file(false);
 466     TestStruct obj = { .skip_c_e = true, .c = 300, .e = 500 };
 467     vmstate_load_state(loading, &vmstate_skipping, &obj, 2);
 468     g_assert(!qemu_file_get_error(loading));
 469     g_assert_cmpint(obj.a, ==, 10);
 470     g_assert_cmpint(obj.b, ==, 20);
 471     g_assert_cmpint(obj.c, ==, 300);
 472     g_assert_cmpint(obj.d, ==, 40);
 473     g_assert_cmpint(obj.e, ==, 500);
 474     g_assert_cmpint(obj.f, ==, 60);
 475     qemu_fclose(loading);
 476 }
 477
 478 int main(int argc, char **argv)
 479 {
 480     temp_fd = mkstemp(temp_file);
 481
 482     module_call_init(MODULE_INIT_QOM);
 483
 484     g_test_init(&argc, &argv, NULL);
 485     g_test_add_func("/vmstate/simple/primitive", test_simple_primitive);
 486     g_test_add_func("/vmstate/versioned/load/v1", test_load_v1);
 487     g_test_add_func("/vmstate/versioned/load/v2", test_load_v2);
 488     g_test_add_func("/vmstate/field_exists/load/noskip", test_load_noskip);
 489     g_test_add_func("/vmstate/field_exists/load/skip", test_load_skip);
 490     g_test_add_func("/vmstate/field_exists/save/noskip", test_save_noskip);
 491     g_test_add_func("/vmstate/field_exists/save/skip", test_save_skip);
 492     g_test_run();
 493
 494     close(temp_fd);
 495     unlink(temp_file);
 496
 497     return 0;
 498 }