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 <glib.h>
  26
  27 #include "qemu-common.h"
  28 #include "migration/migration.h"
  29 #include "migration/vmstate.h"
  30 #include "qemu/coroutine.h"
  31
  32 static char temp_file[] = "/tmp/vmst.test.XXXXXX";
  33 static int temp_fd;
  34
  35 /* Fake yield_until_fd_readable() implementation so we don't have to pull the
  36  * coroutine code as dependency.
  37  */
  38 void yield_until_fd_readable(int fd)
  39 {
  40     fd_set fds;
  41     FD_ZERO(&fds);
  42     FD_SET(fd, &fds);
  43     select(fd + 1, &fds, NULL, NULL, NULL);
  44 }
  45
  46 /*
  47  * Some tests use 'open_test_file' to work on a real fd, some use
  48  * an in memory file (QEMUSizedBuffer+qemu_bufopen); we could pick one
  49  * but this way we test both.
  50  */
  51
  52 /* Duplicate temp_fd and seek to the beginning of the file */
  53 static QEMUFile *open_test_file(bool write)
  54 {
  55     int fd = dup(temp_fd);
  56     lseek(fd, 0, SEEK_SET);
  57     if (write) {
  58         g_assert_cmpint(ftruncate(fd, 0), ==, 0);
  59     }
  60     return qemu_fdopen(fd, write ? "wb" : "rb");
  61 }
  62
  63 /*
  64  * Check that the contents of the memory-buffered file f match
  65  * the given size/data.
  66  */
  67 static void check_mem_file(QEMUFile *f, void *data, size_t size)
  68 {
  69     uint8_t *result = g_malloc(size);
  70     const QEMUSizedBuffer *qsb = qemu_buf_get(f);
  71     g_assert_cmpint(qsb_get_length(qsb), ==, size);
  72     g_assert_cmpint(qsb_get_buffer(qsb, 0, size, result), ==, size);
  73     g_assert_cmpint(memcmp(result, data, size), ==, 0);
  74     g_free(result);
  75 }
  76
  77 #define SUCCESS(val) \
  78     g_assert_cmpint((val), ==, 0)
  79
  80 #define FAILURE(val) \
  81     g_assert_cmpint((val), !=, 0)
  82
  83 static void save_vmstate(const VMStateDescription *desc, void *obj)
  84 {
  85     QEMUFile *f = open_test_file(true);
  86
  87     /* Save file with vmstate */
  88     vmstate_save_state(f, desc, obj, NULL);
  89     qemu_put_byte(f, QEMU_VM_EOF);
  90     g_assert(!qemu_file_get_error(f));
  91     qemu_fclose(f);
  92 }
  93
  94 static void compare_vmstate(uint8_t *wire, size_t size)
  95 {
  96     QEMUFile *f = open_test_file(false);
  97     uint8_t result[size];
  98
  99     /* read back as binary */
 100
 101     g_assert_cmpint(qemu_get_buffer(f, result, sizeof(result)), ==,
 102                     sizeof(result));
 103     g_assert(!qemu_file_get_error(f));
 104
 105     /* Compare that what is on the file is the same that what we
 106        expected to be there */
 107     SUCCESS(memcmp(result, wire, sizeof(result)));
 108
 109     /* Must reach EOF */
 110     qemu_get_byte(f);
 111     g_assert_cmpint(qemu_file_get_error(f), ==, -EIO);
 112
 113     qemu_fclose(f);
 114 }
 115
 116 static int load_vmstate_one(const VMStateDescription *desc, void *obj,
 117                             int version, uint8_t *wire, size_t size)
 118 {
 119     QEMUFile *f;
 120     int ret;
 121
 122     f = open_test_file(true);
 123     qemu_put_buffer(f, wire, size);
 124     qemu_fclose(f);
 125
 126     f = open_test_file(false);
 127     ret = vmstate_load_state(f, desc, obj, version);
 128     if (ret) {
 129         g_assert(qemu_file_get_error(f));
 130     } else{
 131         g_assert(!qemu_file_get_error(f));
 132     }
 133     qemu_fclose(f);
 134     return ret;
 135 }
 136
 137
 138 static int load_vmstate(const VMStateDescription *desc,
 139                         void *obj, void *obj_clone,
 140                         void (*obj_copy)(void *, void*),
 141                         int version, uint8_t *wire, size_t size)
 142 {
 143     /* We test with zero size */
 144     obj_copy(obj_clone, obj);
 145     FAILURE(load_vmstate_one(desc, obj, version, wire, 0));
 146
 147     /* Stream ends with QEMU_EOF, so we need at least 3 bytes to be
 148      * able to test in the middle */
 149
 150     if (size > 3) {
 151
 152         /* We test with size - 2. We can't test size - 1 due to EOF tricks */
 153         obj_copy(obj, obj_clone);
 154         FAILURE(load_vmstate_one(desc, obj, version, wire, size - 2));
 155
 156         /* Test with size/2, first half of real state */
 157         obj_copy(obj, obj_clone);
 158         FAILURE(load_vmstate_one(desc, obj, version, wire, size/2));
 159
 160         /* Test with size/2, second half of real state */
 161         obj_copy(obj, obj_clone);
 162         FAILURE(load_vmstate_one(desc, obj, version, wire + (size/2), size/2));
 163
 164     }
 165     obj_copy(obj, obj_clone);
 166     return load_vmstate_one(desc, obj, version, wire, size);
 167 }
 168
 169 /* Test struct that we are going to use for our tests */
 170
 171 typedef struct TestSimple {
 172     bool     b_1,   b_2;
 173     uint8_t  u8_1;
 174     uint16_t u16_1;
 175     uint32_t u32_1;
 176     uint64_t u64_1;
 177     int8_t   i8_1,  i8_2;
 178     int16_t  i16_1, i16_2;
 179     int32_t  i32_1, i32_2;
 180     int64_t  i64_1, i64_2;
 181 } TestSimple;
 182
 183 /* Object instantiation, we are going to use it in more than one test */
 184
 185 TestSimple obj_simple = {
 186     .b_1 = true,
 187     .b_2 = false,
 188     .u8_1 = 130,
 189     .u16_1 = 512,
 190     .u32_1 = 70000,
 191     .u64_1 = 12121212,
 192     .i8_1 = 65,
 193     .i8_2 = -65,
 194     .i16_1 = 512,
 195     .i16_2 = -512,
 196     .i32_1 = 70000,
 197     .i32_2 = -70000,
 198     .i64_1 = 12121212,
 199     .i64_2 = -12121212,
 200 };
 201
 202 /* Description of the values.  If you add a primitive type
 203    you are expected to add a test here */
 204
 205 static const VMStateDescription vmstate_simple_primitive = {
 206     .name = "simple/primitive",
 207     .version_id = 1,
 208     .minimum_version_id = 1,
 209     .fields = (VMStateField[]) {
 210         VMSTATE_BOOL(b_1, TestSimple),
 211         VMSTATE_BOOL(b_2, TestSimple),
 212         VMSTATE_UINT8(u8_1, TestSimple),
 213         VMSTATE_UINT16(u16_1, TestSimple),
 214         VMSTATE_UINT32(u32_1, TestSimple),
 215         VMSTATE_UINT64(u64_1, TestSimple),
 216         VMSTATE_INT8(i8_1, TestSimple),
 217         VMSTATE_INT8(i8_2, TestSimple),
 218         VMSTATE_INT16(i16_1, TestSimple),
 219         VMSTATE_INT16(i16_2, TestSimple),
 220         VMSTATE_INT32(i32_1, TestSimple),
 221         VMSTATE_INT32(i32_2, TestSimple),
 222         VMSTATE_INT64(i64_1, TestSimple),
 223         VMSTATE_INT64(i64_2, TestSimple),
 224         VMSTATE_END_OF_LIST()
 225     }
 226 };
 227
 228 /* It describes what goes through the wire.  Our tests are basically:
 229
 230    * save test
 231      - save a struct a vmstate to a file
 232      - read that file back (binary read, no vmstate)
 233      - compare it with what we expect to be on the wire
 234    * load test
 235      - save to the file what we expect to be on the wire
 236      - read struct back with vmstate in a different
 237      - compare back with the original struct
 238 */
 239
 240 uint8_t wire_simple_primitive[] = {
 241     /* b_1 */   0x01,
 242     /* b_2 */   0x00,
 243     /* u8_1 */  0x82,
 244     /* u16_1 */ 0x02, 0x00,
 245     /* u32_1 */ 0x00, 0x01, 0x11, 0x70,
 246     /* u64_1 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0xb8, 0xf4, 0x7c,
 247     /* i8_1 */  0x41,
 248     /* i8_2 */  0xbf,
 249     /* i16_1 */ 0x02, 0x00,
 250     /* i16_2 */ 0xfe, 0x0,
 251     /* i32_1 */ 0x00, 0x01, 0x11, 0x70,
 252     /* i32_2 */ 0xff, 0xfe, 0xee, 0x90,
 253     /* i64_1 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0xb8, 0xf4, 0x7c,
 254     /* i64_2 */ 0xff, 0xff, 0xff, 0xff, 0xff, 0x47, 0x0b, 0x84,
 255     QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
 256 };
 257
 258 static void obj_simple_copy(void *target, void *source)
 259 {
 260     memcpy(target, source, sizeof(TestSimple));
 261 }
 262
 263 static void test_simple_primitive(void)
 264 {
 265     TestSimple obj, obj_clone;
 266
 267     memset(&obj, 0, sizeof(obj));
 268     save_vmstate(&vmstate_simple_primitive, &obj_simple);
 269
 270     compare_vmstate(wire_simple_primitive, sizeof(wire_simple_primitive));
 271
 272     SUCCESS(load_vmstate(&vmstate_simple_primitive, &obj, &obj_clone,
 273                          obj_simple_copy, 1, wire_simple_primitive,
 274                          sizeof(wire_simple_primitive)));
 275
 276 #define FIELD_EQUAL(name)   g_assert_cmpint(obj.name, ==, obj_simple.name)
 277
 278     FIELD_EQUAL(b_1);
 279     FIELD_EQUAL(b_2);
 280     FIELD_EQUAL(u8_1);
 281     FIELD_EQUAL(u16_1);
 282     FIELD_EQUAL(u32_1);
 283     FIELD_EQUAL(u64_1);
 284     FIELD_EQUAL(i8_1);
 285     FIELD_EQUAL(i8_2);
 286     FIELD_EQUAL(i16_1);
 287     FIELD_EQUAL(i16_2);
 288     FIELD_EQUAL(i32_1);
 289     FIELD_EQUAL(i32_2);
 290     FIELD_EQUAL(i64_1);
 291     FIELD_EQUAL(i64_2);
 292 }
 293 #undef FIELD_EQUAL
 294
 295 typedef struct TestStruct {
 296     uint32_t a, b, c, e;
 297     uint64_t d, f;
 298     bool skip_c_e;
 299 } TestStruct;
 300
 301 static const VMStateDescription vmstate_versioned = {
 302     .name = "test/versioned",
 303     .version_id = 2,
 304     .minimum_version_id = 1,
 305     .fields = (VMStateField[]) {
 306         VMSTATE_UINT32(a, TestStruct),
 307         VMSTATE_UINT32_V(b, TestStruct, 2), /* Versioned field in the middle, so
 308                                              * we catch bugs more easily.
 309                                              */
 310         VMSTATE_UINT32(c, TestStruct),
 311         VMSTATE_UINT64(d, TestStruct),
 312         VMSTATE_UINT32_V(e, TestStruct, 2),
 313         VMSTATE_UINT64_V(f, TestStruct, 2),
 314         VMSTATE_END_OF_LIST()
 315     }
 316 };
 317
 318 static void test_load_v1(void)
 319 {
 320     QEMUFile *fsave = open_test_file(true);
 321     uint8_t buf[] = {
 322         0, 0, 0, 10,             /* a */
 323         0, 0, 0, 30,             /* c */
 324         0, 0, 0, 0, 0, 0, 0, 40, /* d */
 325         QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
 326     };
 327     qemu_put_buffer(fsave, buf, sizeof(buf));
 328     qemu_fclose(fsave);
 329
 330     QEMUFile *loading = open_test_file(false);
 331     TestStruct obj = { .b = 200, .e = 500, .f = 600 };
 332     vmstate_load_state(loading, &vmstate_versioned, &obj, 1);
 333     g_assert(!qemu_file_get_error(loading));
 334     g_assert_cmpint(obj.a, ==, 10);
 335     g_assert_cmpint(obj.b, ==, 200);
 336     g_assert_cmpint(obj.c, ==, 30);
 337     g_assert_cmpint(obj.d, ==, 40);
 338     g_assert_cmpint(obj.e, ==, 500);
 339     g_assert_cmpint(obj.f, ==, 600);
 340     qemu_fclose(loading);
 341 }
 342
 343 static void test_load_v2(void)
 344 {
 345     QEMUFile *fsave = open_test_file(true);
 346     uint8_t buf[] = {
 347         0, 0, 0, 10,             /* a */
 348         0, 0, 0, 20,             /* b */
 349         0, 0, 0, 30,             /* c */
 350         0, 0, 0, 0, 0, 0, 0, 40, /* d */
 351         0, 0, 0, 50,             /* e */
 352         0, 0, 0, 0, 0, 0, 0, 60, /* f */
 353         QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
 354     };
 355     qemu_put_buffer(fsave, buf, sizeof(buf));
 356     qemu_fclose(fsave);
 357
 358     QEMUFile *loading = open_test_file(false);
 359     TestStruct obj;
 360     vmstate_load_state(loading, &vmstate_versioned, &obj, 2);
 361     g_assert_cmpint(obj.a, ==, 10);
 362     g_assert_cmpint(obj.b, ==, 20);
 363     g_assert_cmpint(obj.c, ==, 30);
 364     g_assert_cmpint(obj.d, ==, 40);
 365     g_assert_cmpint(obj.e, ==, 50);
 366     g_assert_cmpint(obj.f, ==, 60);
 367     qemu_fclose(loading);
 368 }
 369
 370 static bool test_skip(void *opaque, int version_id)
 371 {
 372     TestStruct *t = (TestStruct *)opaque;
 373     return !t->skip_c_e;
 374 }
 375
 376 static const VMStateDescription vmstate_skipping = {
 377     .name = "test/skip",
 378     .version_id = 2,
 379     .minimum_version_id = 1,
 380     .fields = (VMStateField[]) {
 381         VMSTATE_UINT32(a, TestStruct),
 382         VMSTATE_UINT32(b, TestStruct),
 383         VMSTATE_UINT32_TEST(c, TestStruct, test_skip),
 384         VMSTATE_UINT64(d, TestStruct),
 385         VMSTATE_UINT32_TEST(e, TestStruct, test_skip),
 386         VMSTATE_UINT64_V(f, TestStruct, 2),
 387         VMSTATE_END_OF_LIST()
 388     }
 389 };
 390
 391
 392 static void test_save_noskip(void)
 393 {
 394     QEMUFile *fsave = qemu_bufopen("w", NULL);
 395     TestStruct obj = { .a = 1, .b = 2, .c = 3, .d = 4, .e = 5, .f = 6,
 396                        .skip_c_e = false };
 397     vmstate_save_state(fsave, &vmstate_skipping, &obj, NULL);
 398     g_assert(!qemu_file_get_error(fsave));
 399
 400     uint8_t expected[] = {
 401         0, 0, 0, 1,             /* a */
 402         0, 0, 0, 2,             /* b */
 403         0, 0, 0, 3,             /* c */
 404         0, 0, 0, 0, 0, 0, 0, 4, /* d */
 405         0, 0, 0, 5,             /* e */
 406         0, 0, 0, 0, 0, 0, 0, 6, /* f */
 407     };
 408     check_mem_file(fsave, expected, sizeof(expected));
 409     qemu_fclose(fsave);
 410 }
 411
 412 static void test_save_skip(void)
 413 {
 414     QEMUFile *fsave = qemu_bufopen("w", NULL);
 415     TestStruct obj = { .a = 1, .b = 2, .c = 3, .d = 4, .e = 5, .f = 6,
 416                        .skip_c_e = true };
 417     vmstate_save_state(fsave, &vmstate_skipping, &obj, NULL);
 418     g_assert(!qemu_file_get_error(fsave));
 419
 420     uint8_t expected[] = {
 421         0, 0, 0, 1,             /* a */
 422         0, 0, 0, 2,             /* b */
 423         0, 0, 0, 0, 0, 0, 0, 4, /* d */
 424         0, 0, 0, 0, 0, 0, 0, 6, /* f */
 425     };
 426     check_mem_file(fsave, expected, sizeof(expected));
 427
 428     qemu_fclose(fsave);
 429 }
 430
 431 static void test_load_noskip(void)
 432 {
 433     uint8_t buf[] = {
 434         0, 0, 0, 10,             /* a */
 435         0, 0, 0, 20,             /* b */
 436         0, 0, 0, 30,             /* c */
 437         0, 0, 0, 0, 0, 0, 0, 40, /* d */
 438         0, 0, 0, 50,             /* e */
 439         0, 0, 0, 0, 0, 0, 0, 60, /* f */
 440         QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
 441     };
 442
 443     QEMUSizedBuffer *qsb = qsb_create(buf, sizeof(buf));
 444     g_assert(qsb);
 445     QEMUFile *loading = qemu_bufopen("r", qsb);
 446     TestStruct obj = { .skip_c_e = false };
 447     vmstate_load_state(loading, &vmstate_skipping, &obj, 2);
 448     g_assert(!qemu_file_get_error(loading));
 449     g_assert_cmpint(obj.a, ==, 10);
 450     g_assert_cmpint(obj.b, ==, 20);
 451     g_assert_cmpint(obj.c, ==, 30);
 452     g_assert_cmpint(obj.d, ==, 40);
 453     g_assert_cmpint(obj.e, ==, 50);
 454     g_assert_cmpint(obj.f, ==, 60);
 455     qemu_fclose(loading);
 456     qsb_free(qsb);
 457 }
 458
 459 static void test_load_skip(void)
 460 {
 461     uint8_t buf[] = {
 462         0, 0, 0, 10,             /* a */
 463         0, 0, 0, 20,             /* b */
 464         0, 0, 0, 0, 0, 0, 0, 40, /* d */
 465         0, 0, 0, 0, 0, 0, 0, 60, /* f */
 466         QEMU_VM_EOF, /* just to ensure we won't get EOF reported prematurely */
 467     };
 468
 469     QEMUSizedBuffer *qsb = qsb_create(buf, sizeof(buf));
 470     g_assert(qsb);
 471     QEMUFile *loading = qemu_bufopen("r", qsb);
 472     TestStruct obj = { .skip_c_e = true, .c = 300, .e = 500 };
 473     vmstate_load_state(loading, &vmstate_skipping, &obj, 2);
 474     g_assert(!qemu_file_get_error(loading));
 475     g_assert_cmpint(obj.a, ==, 10);
 476     g_assert_cmpint(obj.b, ==, 20);
 477     g_assert_cmpint(obj.c, ==, 300);
 478     g_assert_cmpint(obj.d, ==, 40);
 479     g_assert_cmpint(obj.e, ==, 500);
 480     g_assert_cmpint(obj.f, ==, 60);
 481     qemu_fclose(loading);
 482     qsb_free(qsb);
 483 }
 484
 485 int main(int argc, char **argv)
 486 {
 487     temp_fd = mkstemp(temp_file);
 488
 489     g_test_init(&argc, &argv, NULL);
 490     g_test_add_func("/vmstate/simple/primitive", test_simple_primitive);
 491     g_test_add_func("/vmstate/versioned/load/v1", test_load_v1);
 492     g_test_add_func("/vmstate/versioned/load/v2", test_load_v2);
 493     g_test_add_func("/vmstate/field_exists/load/noskip", test_load_noskip);
 494     g_test_add_func("/vmstate/field_exists/load/skip", test_load_skip);
 495     g_test_add_func("/vmstate/field_exists/save/noskip", test_save_noskip);
 496     g_test_add_func("/vmstate/field_exists/save/skip", test_save_skip);
 497     g_test_run();
 498
 499     close(temp_fd);
 500     unlink(temp_file);
 501
 502     return 0;
 503 }