arch_init.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   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 #include <stdint.h>
  25 #include <stdarg.h>
  26 #include <stdlib.h>
  27 #ifndef _WIN32
  28 #include <sys/types.h>
  29 #include <sys/mman.h>
  30 #endif
  31 #include "config.h"
  32 #include "monitor.h"
  33 #include "sysemu.h"
  34 #include "bitops.h"
  35 #include "bitmap.h"
  36 #include "arch_init.h"
  37 #include "audio/audio.h"
  38 #include "hw/pc.h"
  39 #include "hw/pci.h"
  40 #include "hw/audiodev.h"
  41 #include "kvm.h"
  42 #include "migration.h"
  43 #include "net.h"
  44 #include "gdbstub.h"
  45 #include "hw/smbios.h"
  46 #include "exec-memory.h"
  47 #include "hw/pcspk.h"
  48 #include "qemu/page_cache.h"
  49 #include "qmp-commands.h"
  50 #include "trace.h"
  51
  52 #ifdef DEBUG_ARCH_INIT
  53 #define DPRINTF(fmt, ...) \
  54     do { fprintf(stdout, "arch_init: " fmt, ## __VA_ARGS__); } while (0)
  55 #else
  56 #define DPRINTF(fmt, ...) \
  57     do { } while (0)
  58 #endif
  59
  60 #ifdef TARGET_SPARC
  61 int graphic_width = 1024;
  62 int graphic_height = 768;
  63 int graphic_depth = 8;
  64 #else
  65 int graphic_width = 800;
  66 int graphic_height = 600;
  67 int graphic_depth = 15;
  68 #endif
  69
  70
  71 #if defined(TARGET_ALPHA)
  72 #define QEMU_ARCH QEMU_ARCH_ALPHA
  73 #elif defined(TARGET_ARM)
  74 #define QEMU_ARCH QEMU_ARCH_ARM
  75 #elif defined(TARGET_CRIS)
  76 #define QEMU_ARCH QEMU_ARCH_CRIS
  77 #elif defined(TARGET_I386)
  78 #define QEMU_ARCH QEMU_ARCH_I386
  79 #elif defined(TARGET_M68K)
  80 #define QEMU_ARCH QEMU_ARCH_M68K
  81 #elif defined(TARGET_LM32)
  82 #define QEMU_ARCH QEMU_ARCH_LM32
  83 #elif defined(TARGET_MICROBLAZE)
  84 #define QEMU_ARCH QEMU_ARCH_MICROBLAZE
  85 #elif defined(TARGET_MIPS)
  86 #define QEMU_ARCH QEMU_ARCH_MIPS
  87 #elif defined(TARGET_OPENRISC)
  88 #define QEMU_ARCH QEMU_ARCH_OPENRISC
  89 #elif defined(TARGET_PPC)
  90 #define QEMU_ARCH QEMU_ARCH_PPC
  91 #elif defined(TARGET_S390X)
  92 #define QEMU_ARCH QEMU_ARCH_S390X
  93 #elif defined(TARGET_SH4)
  94 #define QEMU_ARCH QEMU_ARCH_SH4
  95 #elif defined(TARGET_SPARC)
  96 #define QEMU_ARCH QEMU_ARCH_SPARC
  97 #elif defined(TARGET_XTENSA)
  98 #define QEMU_ARCH QEMU_ARCH_XTENSA
  99 #elif defined(TARGET_UNICORE32)
 100 #define QEMU_ARCH QEMU_ARCH_UNICORE32
 101 #endif
 102
 103 const uint32_t arch_type = QEMU_ARCH;
 104
 105 /***********************************************************/
 106 /* ram save/restore */
 107
 108 #define RAM_SAVE_FLAG_FULL     0x01 /* Obsolete, not used anymore */
 109 #define RAM_SAVE_FLAG_COMPRESS 0x02
 110 #define RAM_SAVE_FLAG_MEM_SIZE 0x04
 111 #define RAM_SAVE_FLAG_PAGE     0x08
 112 #define RAM_SAVE_FLAG_EOS      0x10
 113 #define RAM_SAVE_FLAG_CONTINUE 0x20
 114 #define RAM_SAVE_FLAG_XBZRLE   0x40
 115
 116 #ifdef __ALTIVEC__
 117 #include <altivec.h>
 118 #define VECTYPE        vector unsigned char
 119 #define SPLAT(p)       vec_splat(vec_ld(0, p), 0)
 120 #define ALL_EQ(v1, v2) vec_all_eq(v1, v2)
 121 /* altivec.h may redefine the bool macro as vector type.
 122  * Reset it to POSIX semantics. */
 123 #undef bool
 124 #define bool _Bool
 125 #elif defined __SSE2__
 126 #include <emmintrin.h>
 127 #define VECTYPE        __m128i
 128 #define SPLAT(p)       _mm_set1_epi8(*(p))
 129 #define ALL_EQ(v1, v2) (_mm_movemask_epi8(_mm_cmpeq_epi8(v1, v2)) == 0xFFFF)
 130 #else
 131 #define VECTYPE        unsigned long
 132 #define SPLAT(p)       (*(p) * (~0UL / 255))
 133 #define ALL_EQ(v1, v2) ((v1) == (v2))
 134 #endif
 135
 136
 137 static struct defconfig_file {
 138     const char *filename;
 139     /* Indicates it is an user config file (disabled by -no-user-config) */
 140     bool userconfig;
 141 } default_config_files[] = {
 142     { CONFIG_QEMU_CONFDIR "/qemu.conf",                   true },
 143     { CONFIG_QEMU_CONFDIR "/target-" TARGET_ARCH ".conf", true },
 144     { NULL }, /* end of list */
 145 };
 146
 147
 148 int qemu_read_default_config_files(bool userconfig)
 149 {
 150     int ret;
 151     struct defconfig_file *f;
 152
 153     for (f = default_config_files; f->filename; f++) {
 154         if (!userconfig && f->userconfig) {
 155             continue;
 156         }
 157         ret = qemu_read_config_file(f->filename);
 158         if (ret < 0 && ret != -ENOENT) {
 159             return ret;
 160         }
 161     }
 162
 163     return 0;
 164 }
 165
 166 static int is_dup_page(uint8_t *page)
 167 {
 168     VECTYPE *p = (VECTYPE *)page;
 169     VECTYPE val = SPLAT(page);
 170     int i;
 171
 172     for (i = 0; i < TARGET_PAGE_SIZE / sizeof(VECTYPE); i++) {
 173         if (!ALL_EQ(val, p[i])) {
 174             return 0;
 175         }
 176     }
 177
 178     return 1;
 179 }
 180
 181 /* struct contains XBZRLE cache and a static page
 182    used by the compression */
 183 static struct {
 184     /* buffer used for XBZRLE encoding */
 185     uint8_t *encoded_buf;
 186     /* buffer for storing page content */
 187     uint8_t *current_buf;
 188     /* buffer used for XBZRLE decoding */
 189     uint8_t *decoded_buf;
 190     /* Cache for XBZRLE */
 191     PageCache *cache;
 192 } XBZRLE = {
 193     .encoded_buf = NULL,
 194     .current_buf = NULL,
 195     .decoded_buf = NULL,
 196     .cache = NULL,
 197 };
 198
 199
 200 int64_t xbzrle_cache_resize(int64_t new_size)
 201 {
 202     if (XBZRLE.cache != NULL) {
 203         return cache_resize(XBZRLE.cache, new_size / TARGET_PAGE_SIZE) *
 204             TARGET_PAGE_SIZE;
 205     }
 206     return pow2floor(new_size);
 207 }
 208
 209 /* accounting for migration statistics */
 210 typedef struct AccountingInfo {
 211     uint64_t dup_pages;
 212     uint64_t norm_pages;
 213     uint64_t iterations;
 214     uint64_t xbzrle_bytes;
 215     uint64_t xbzrle_pages;
 216     uint64_t xbzrle_cache_miss;
 217     uint64_t xbzrle_overflows;
 218 } AccountingInfo;
 219
 220 static AccountingInfo acct_info;
 221
 222 static void acct_clear(void)
 223 {
 224     memset(&acct_info, 0, sizeof(acct_info));
 225 }
 226
 227 uint64_t dup_mig_bytes_transferred(void)
 228 {
 229     return acct_info.dup_pages * TARGET_PAGE_SIZE;
 230 }
 231
 232 uint64_t dup_mig_pages_transferred(void)
 233 {
 234     return acct_info.dup_pages;
 235 }
 236
 237 uint64_t norm_mig_bytes_transferred(void)
 238 {
 239     return acct_info.norm_pages * TARGET_PAGE_SIZE;
 240 }
 241
 242 uint64_t norm_mig_pages_transferred(void)
 243 {
 244     return acct_info.norm_pages;
 245 }
 246
 247 uint64_t xbzrle_mig_bytes_transferred(void)
 248 {
 249     return acct_info.xbzrle_bytes;
 250 }
 251
 252 uint64_t xbzrle_mig_pages_transferred(void)
 253 {
 254     return acct_info.xbzrle_pages;
 255 }
 256
 257 uint64_t xbzrle_mig_pages_cache_miss(void)
 258 {
 259     return acct_info.xbzrle_cache_miss;
 260 }
 261
 262 uint64_t xbzrle_mig_pages_overflow(void)
 263 {
 264     return acct_info.xbzrle_overflows;
 265 }
 266
 267 static void save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
 268         int cont, int flag)
 269 {
 270         qemu_put_be64(f, offset | cont | flag);
 271         if (!cont) {
 272                 qemu_put_byte(f, strlen(block->idstr));
 273                 qemu_put_buffer(f, (uint8_t *)block->idstr,
 274                                 strlen(block->idstr));
 275         }
 276
 277 }
 278
 279 #define ENCODING_FLAG_XBZRLE 0x1
 280
 281 static int save_xbzrle_page(QEMUFile *f, uint8_t *current_data,
 282                             ram_addr_t current_addr, RAMBlock *block,
 283                             ram_addr_t offset, int cont, bool last_stage)
 284 {
 285     int encoded_len = 0, bytes_sent = -1;
 286     uint8_t *prev_cached_page;
 287
 288     if (!cache_is_cached(XBZRLE.cache, current_addr)) {
 289         if (!last_stage) {
 290             cache_insert(XBZRLE.cache, current_addr,
 291                          g_memdup(current_data, TARGET_PAGE_SIZE));
 292         }
 293         acct_info.xbzrle_cache_miss++;
 294         return -1;
 295     }
 296
 297     prev_cached_page = get_cached_data(XBZRLE.cache, current_addr);
 298
 299     /* save current buffer into memory */
 300     memcpy(XBZRLE.current_buf, current_data, TARGET_PAGE_SIZE);
 301
 302     /* XBZRLE encoding (if there is no overflow) */
 303     encoded_len = xbzrle_encode_buffer(prev_cached_page, XBZRLE.current_buf,
 304                                        TARGET_PAGE_SIZE, XBZRLE.encoded_buf,
 305                                        TARGET_PAGE_SIZE);
 306     if (encoded_len == 0) {
 307         DPRINTF("Skipping unmodified page\n");
 308         return 0;
 309     } else if (encoded_len == -1) {
 310         DPRINTF("Overflow\n");
 311         acct_info.xbzrle_overflows++;
 312         /* update data in the cache */
 313         memcpy(prev_cached_page, current_data, TARGET_PAGE_SIZE);
 314         return -1;
 315     }
 316
 317     /* we need to update the data in the cache, in order to get the same data */
 318     if (!last_stage) {
 319         memcpy(prev_cached_page, XBZRLE.current_buf, TARGET_PAGE_SIZE);
 320     }
 321
 322     /* Send XBZRLE based compressed page */
 323     save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_XBZRLE);
 324     qemu_put_byte(f, ENCODING_FLAG_XBZRLE);
 325     qemu_put_be16(f, encoded_len);
 326     qemu_put_buffer(f, XBZRLE.encoded_buf, encoded_len);
 327     bytes_sent = encoded_len + 1 + 2;
 328     acct_info.xbzrle_pages++;
 329     acct_info.xbzrle_bytes += bytes_sent;
 330
 331     return bytes_sent;
 332 }
 333
 334 static RAMBlock *last_block;
 335 static ram_addr_t last_offset;
 336 static unsigned long *migration_bitmap;
 337 static uint64_t migration_dirty_pages;
 338
 339 static inline bool migration_bitmap_test_and_reset_dirty(MemoryRegion *mr,
 340                                                          ram_addr_t offset)
 341 {
 342     bool ret;
 343     int nr = (mr->ram_addr + offset) >> TARGET_PAGE_BITS;
 344
 345     ret = test_and_clear_bit(nr, migration_bitmap);
 346
 347     if (ret) {
 348         migration_dirty_pages--;
 349     }
 350     return ret;
 351 }
 352
 353 static inline bool migration_bitmap_set_dirty(MemoryRegion *mr,
 354                                               ram_addr_t offset)
 355 {
 356     bool ret;
 357     int nr = (mr->ram_addr + offset) >> TARGET_PAGE_BITS;
 358
 359     ret = test_and_set_bit(nr, migration_bitmap);
 360
 361     if (!ret) {
 362         migration_dirty_pages++;
 363     }
 364     return ret;
 365 }
 366
 367 static void migration_bitmap_sync(void)
 368 {
 369     RAMBlock *block;
 370     ram_addr_t addr;
 371     uint64_t num_dirty_pages_init = migration_dirty_pages;
 372     MigrationState *s = migrate_get_current();
 373     static int64_t start_time;
 374     static int64_t num_dirty_pages_period;
 375     int64_t end_time;
 376
 377     if (!start_time) {
 378         start_time = qemu_get_clock_ms(rt_clock);
 379     }
 380
 381     trace_migration_bitmap_sync_start();
 382     memory_global_sync_dirty_bitmap(get_system_memory());
 383
 384     QLIST_FOREACH(block, &ram_list.blocks, next) {
 385         for (addr = 0; addr < block->length; addr += TARGET_PAGE_SIZE) {
 386             if (memory_region_get_dirty(block->mr, addr, TARGET_PAGE_SIZE,
 387                                         DIRTY_MEMORY_MIGRATION)) {
 388                 migration_bitmap_set_dirty(block->mr, addr);
 389             }
 390         }
 391         memory_region_reset_dirty(block->mr, 0, block->length,
 392                                   DIRTY_MEMORY_MIGRATION);
 393     }
 394     trace_migration_bitmap_sync_end(migration_dirty_pages
 395                                     - num_dirty_pages_init);
 396     num_dirty_pages_period += migration_dirty_pages - num_dirty_pages_init;
 397     end_time = qemu_get_clock_ms(rt_clock);
 398
 399     /* more than 1 second = 1000 millisecons */
 400     if (end_time > start_time + 1000) {
 401         s->dirty_pages_rate = num_dirty_pages_period * 1000
 402             / (end_time - start_time);
 403         start_time = end_time;
 404         num_dirty_pages_period = 0;
 405     }
 406 }
 407
 408
 409 /*
 410  * ram_save_block: Writes a page of memory to the stream f
 411  *
 412  * Returns:  0: if the page hasn't changed
 413  *          -1: if there are no more dirty pages
 414  *           n: the amount of bytes written in other case
 415  */
 416
 417 static int ram_save_block(QEMUFile *f, bool last_stage)
 418 {
 419     RAMBlock *block = last_block;
 420     ram_addr_t offset = last_offset;
 421     int bytes_sent = -1;
 422     MemoryRegion *mr;
 423     ram_addr_t current_addr;
 424
 425     if (!block)
 426         block = QLIST_FIRST(&ram_list.blocks);
 427
 428     do {
 429         mr = block->mr;
 430         if (migration_bitmap_test_and_reset_dirty(mr, offset)) {
 431             uint8_t *p;
 432             int cont = (block == last_block) ? RAM_SAVE_FLAG_CONTINUE : 0;
 433
 434             p = memory_region_get_ram_ptr(mr) + offset;
 435
 436             if (is_dup_page(p)) {
 437                 acct_info.dup_pages++;
 438                 save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_COMPRESS);
 439                 qemu_put_byte(f, *p);
 440                 bytes_sent = 1;
 441             } else if (migrate_use_xbzrle()) {
 442                 current_addr = block->offset + offset;
 443                 bytes_sent = save_xbzrle_page(f, p, current_addr, block,
 444                                               offset, cont, last_stage);
 445                 if (!last_stage) {
 446                     p = get_cached_data(XBZRLE.cache, current_addr);
 447                 }
 448             }
 449
 450             /* either we didn't send yet (we may have had XBZRLE overflow) */
 451             if (bytes_sent == -1) {
 452                 save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
 453                 qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
 454                 bytes_sent = TARGET_PAGE_SIZE;
 455                 acct_info.norm_pages++;
 456             }
 457
 458             /* if page is unmodified, continue to the next */
 459             if (bytes_sent != 0) {
 460                 break;
 461             }
 462         }
 463
 464         offset += TARGET_PAGE_SIZE;
 465         if (offset >= block->length) {
 466             offset = 0;
 467             block = QLIST_NEXT(block, next);
 468             if (!block)
 469                 block = QLIST_FIRST(&ram_list.blocks);
 470         }
 471     } while (block != last_block || offset != last_offset);
 472
 473     last_block = block;
 474     last_offset = offset;
 475
 476     return bytes_sent;
 477 }
 478
 479 static uint64_t bytes_transferred;
 480
 481 static ram_addr_t ram_save_remaining(void)
 482 {
 483     return migration_dirty_pages;
 484 }
 485
 486 uint64_t ram_bytes_remaining(void)
 487 {
 488     return ram_save_remaining() * TARGET_PAGE_SIZE;
 489 }
 490
 491 uint64_t ram_bytes_transferred(void)
 492 {
 493     return bytes_transferred;
 494 }
 495
 496 uint64_t ram_bytes_total(void)
 497 {
 498     RAMBlock *block;
 499     uint64_t total = 0;
 500
 501     QLIST_FOREACH(block, &ram_list.blocks, next)
 502         total += block->length;
 503
 504     return total;
 505 }
 506
 507 static int block_compar(const void *a, const void *b)
 508 {
 509     RAMBlock * const *ablock = a;
 510     RAMBlock * const *bblock = b;
 511
 512     return strcmp((*ablock)->idstr, (*bblock)->idstr);
 513 }
 514
 515 static void sort_ram_list(void)
 516 {
 517     RAMBlock *block, *nblock, **blocks;
 518     int n;
 519     n = 0;
 520     QLIST_FOREACH(block, &ram_list.blocks, next) {
 521         ++n;
 522     }
 523     blocks = g_malloc(n * sizeof *blocks);
 524     n = 0;
 525     QLIST_FOREACH_SAFE(block, &ram_list.blocks, next, nblock) {
 526         blocks[n++] = block;
 527         QLIST_REMOVE(block, next);
 528     }
 529     qsort(blocks, n, sizeof *blocks, block_compar);
 530     while (--n >= 0) {
 531         QLIST_INSERT_HEAD(&ram_list.blocks, blocks[n], next);
 532     }
 533     g_free(blocks);
 534 }
 535
 536 static void migration_end(void)
 537 {
 538     memory_global_dirty_log_stop();
 539
 540     if (migrate_use_xbzrle()) {
 541         cache_fini(XBZRLE.cache);
 542         g_free(XBZRLE.cache);
 543         g_free(XBZRLE.encoded_buf);
 544         g_free(XBZRLE.current_buf);
 545         g_free(XBZRLE.decoded_buf);
 546         XBZRLE.cache = NULL;
 547     }
 548 }
 549
 550 static void ram_migration_cancel(void *opaque)
 551 {
 552     migration_end();
 553 }
 554
 555
 556 static void reset_ram_globals(void)
 557 {
 558     last_block = NULL;
 559     last_offset = 0;
 560     sort_ram_list();
 561 }
 562
 563 #define MAX_WAIT 50 /* ms, half buffered_file limit */
 564
 565 static int ram_save_setup(QEMUFile *f, void *opaque)
 566 {
 567     RAMBlock *block;
 568     int64_t ram_pages = last_ram_offset() >> TARGET_PAGE_BITS;
 569
 570     migration_bitmap = bitmap_new(ram_pages);
 571     bitmap_set(migration_bitmap, 0, ram_pages);
 572     migration_dirty_pages = ram_pages;
 573
 574     bytes_transferred = 0;
 575     reset_ram_globals();
 576
 577     if (migrate_use_xbzrle()) {
 578         XBZRLE.cache = cache_init(migrate_xbzrle_cache_size() /
 579                                   TARGET_PAGE_SIZE,
 580                                   TARGET_PAGE_SIZE);
 581         if (!XBZRLE.cache) {
 582             DPRINTF("Error creating cache\n");
 583             return -1;
 584         }
 585         XBZRLE.encoded_buf = g_malloc0(TARGET_PAGE_SIZE);
 586         XBZRLE.current_buf = g_malloc(TARGET_PAGE_SIZE);
 587         acct_clear();
 588     }
 589
 590     memory_global_dirty_log_start();
 591     migration_bitmap_sync();
 592
 593     qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
 594
 595     QLIST_FOREACH(block, &ram_list.blocks, next) {
 596         qemu_put_byte(f, strlen(block->idstr));
 597         qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr));
 598         qemu_put_be64(f, block->length);
 599     }
 600
 601     qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
 602
 603     return 0;
 604 }
 605
 606 static int ram_save_iterate(QEMUFile *f, void *opaque)
 607 {
 608     uint64_t bytes_transferred_last;
 609     double bwidth = 0;
 610     int ret;
 611     int i;
 612     uint64_t expected_downtime;
 613     MigrationState *s = migrate_get_current();
 614
 615     bytes_transferred_last = bytes_transferred;
 616     bwidth = qemu_get_clock_ns(rt_clock);
 617
 618     i = 0;
 619     while ((ret = qemu_file_rate_limit(f)) == 0) {
 620         int bytes_sent;
 621
 622         bytes_sent = ram_save_block(f, false);
 623         /* no more blocks to sent */
 624         if (bytes_sent < 0) {
 625             break;
 626         }
 627         bytes_transferred += bytes_sent;
 628         acct_info.iterations++;
 629         /* we want to check in the 1st loop, just in case it was the 1st time
 630            and we had to sync the dirty bitmap.
 631            qemu_get_clock_ns() is a bit expensive, so we only check each some
 632            iterations
 633         */
 634         if ((i & 63) == 0) {
 635             uint64_t t1 = (qemu_get_clock_ns(rt_clock) - bwidth) / 1000000;
 636             if (t1 > MAX_WAIT) {
 637                 DPRINTF("big wait: %" PRIu64 " milliseconds, %d iterations\n",
 638                         t1, i);
 639                 break;
 640             }
 641         }
 642         i++;
 643     }
 644
 645     if (ret < 0) {
 646         return ret;
 647     }
 648
 649     bwidth = qemu_get_clock_ns(rt_clock) - bwidth;
 650     bwidth = (bytes_transferred - bytes_transferred_last) / bwidth;
 651
 652     /* if we haven't transferred anything this round, force
 653      * expected_downtime to a very high value, but without
 654      * crashing */
 655     if (bwidth == 0) {
 656         bwidth = 0.000001;
 657     }
 658
 659     qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
 660
 661     expected_downtime = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
 662     DPRINTF("ram_save_live: expected(%" PRIu64 ") <= max(" PRIu64 ")?\n",
 663             expected_downtime, migrate_max_downtime());
 664
 665     if (expected_downtime <= migrate_max_downtime()) {
 666         migration_bitmap_sync();
 667         expected_downtime = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
 668         s->expected_downtime = expected_downtime / 1000000; /* ns -> ms */
 669
 670         return expected_downtime <= migrate_max_downtime();
 671     }
 672     return 0;
 673 }
 674
 675 static int ram_save_complete(QEMUFile *f, void *opaque)
 676 {
 677     migration_bitmap_sync();
 678
 679     /* try transferring iterative blocks of memory */
 680
 681     /* flush all remaining blocks regardless of rate limiting */
 682     while (true) {
 683         int bytes_sent;
 684
 685         bytes_sent = ram_save_block(f, true);
 686         /* no more blocks to sent */
 687         if (bytes_sent < 0) {
 688             break;
 689         }
 690         bytes_transferred += bytes_sent;
 691     }
 692     memory_global_dirty_log_stop();
 693
 694     qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
 695
 696     g_free(migration_bitmap);
 697     migration_bitmap = NULL;
 698
 699     return 0;
 700 }
 701
 702 static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host)
 703 {
 704     int ret, rc = 0;
 705     unsigned int xh_len;
 706     int xh_flags;
 707
 708     if (!XBZRLE.decoded_buf) {
 709         XBZRLE.decoded_buf = g_malloc(TARGET_PAGE_SIZE);
 710     }
 711
 712     /* extract RLE header */
 713     xh_flags = qemu_get_byte(f);
 714     xh_len = qemu_get_be16(f);
 715
 716     if (xh_flags != ENCODING_FLAG_XBZRLE) {
 717         fprintf(stderr, "Failed to load XBZRLE page - wrong compression!\n");
 718         return -1;
 719     }
 720
 721     if (xh_len > TARGET_PAGE_SIZE) {
 722         fprintf(stderr, "Failed to load XBZRLE page - len overflow!\n");
 723         return -1;
 724     }
 725     /* load data and decode */
 726     qemu_get_buffer(f, XBZRLE.decoded_buf, xh_len);
 727
 728     /* decode RLE */
 729     ret = xbzrle_decode_buffer(XBZRLE.decoded_buf, xh_len, host,
 730                                TARGET_PAGE_SIZE);
 731     if (ret == -1) {
 732         fprintf(stderr, "Failed to load XBZRLE page - decode error!\n");
 733         rc = -1;
 734     } else  if (ret > TARGET_PAGE_SIZE) {
 735         fprintf(stderr, "Failed to load XBZRLE page - size %d exceeds %d!\n",
 736                 ret, TARGET_PAGE_SIZE);
 737         abort();
 738     }
 739
 740     return rc;
 741 }
 742
 743 static inline void *host_from_stream_offset(QEMUFile *f,
 744                                             ram_addr_t offset,
 745                                             int flags)
 746 {
 747     static RAMBlock *block = NULL;
 748     char id[256];
 749     uint8_t len;
 750
 751     if (flags & RAM_SAVE_FLAG_CONTINUE) {
 752         if (!block) {
 753             fprintf(stderr, "Ack, bad migration stream!\n");
 754             return NULL;
 755         }
 756
 757         return memory_region_get_ram_ptr(block->mr) + offset;
 758     }
 759
 760     len = qemu_get_byte(f);
 761     qemu_get_buffer(f, (uint8_t *)id, len);
 762     id[len] = 0;
 763
 764     QLIST_FOREACH(block, &ram_list.blocks, next) {
 765         if (!strncmp(id, block->idstr, sizeof(id)))
 766             return memory_region_get_ram_ptr(block->mr) + offset;
 767     }
 768
 769     fprintf(stderr, "Can't find block %s!\n", id);
 770     return NULL;
 771 }
 772
 773 static int ram_load(QEMUFile *f, void *opaque, int version_id)
 774 {
 775     ram_addr_t addr;
 776     int flags, ret = 0;
 777     int error;
 778     static uint64_t seq_iter;
 779
 780     seq_iter++;
 781
 782     if (version_id < 4 || version_id > 4) {
 783         return -EINVAL;
 784     }
 785
 786     do {
 787         addr = qemu_get_be64(f);
 788
 789         flags = addr & ~TARGET_PAGE_MASK;
 790         addr &= TARGET_PAGE_MASK;
 791
 792         if (flags & RAM_SAVE_FLAG_MEM_SIZE) {
 793             if (version_id == 4) {
 794                 /* Synchronize RAM block list */
 795                 char id[256];
 796                 ram_addr_t length;
 797                 ram_addr_t total_ram_bytes = addr;
 798
 799                 while (total_ram_bytes) {
 800                     RAMBlock *block;
 801                     uint8_t len;
 802
 803                     len = qemu_get_byte(f);
 804                     qemu_get_buffer(f, (uint8_t *)id, len);
 805                     id[len] = 0;
 806                     length = qemu_get_be64(f);
 807
 808                     QLIST_FOREACH(block, &ram_list.blocks, next) {
 809                         if (!strncmp(id, block->idstr, sizeof(id))) {
 810                             if (block->length != length) {
 811                                 ret =  -EINVAL;
 812                                 goto done;
 813                             }
 814                             break;
 815                         }
 816                     }
 817
 818                     if (!block) {
 819                         fprintf(stderr, "Unknown ramblock \"%s\", cannot "
 820                                 "accept migration\n", id);
 821                         ret = -EINVAL;
 822                         goto done;
 823                     }
 824
 825                     total_ram_bytes -= length;
 826                 }
 827             }
 828         }
 829
 830         if (flags & RAM_SAVE_FLAG_COMPRESS) {
 831             void *host;
 832             uint8_t ch;
 833
 834             host = host_from_stream_offset(f, addr, flags);
 835             if (!host) {
 836                 return -EINVAL;
 837             }
 838
 839             ch = qemu_get_byte(f);
 840             memset(host, ch, TARGET_PAGE_SIZE);
 841 #ifndef _WIN32
 842             if (ch == 0 &&
 843                 (!kvm_enabled() || kvm_has_sync_mmu()) &&
 844                 getpagesize() <= TARGET_PAGE_SIZE) {
 845                 qemu_madvise(host, TARGET_PAGE_SIZE, QEMU_MADV_DONTNEED);
 846             }
 847 #endif
 848         } else if (flags & RAM_SAVE_FLAG_PAGE) {
 849             void *host;
 850
 851             host = host_from_stream_offset(f, addr, flags);
 852             if (!host) {
 853                 return -EINVAL;
 854             }
 855
 856             qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
 857         } else if (flags & RAM_SAVE_FLAG_XBZRLE) {
 858             if (!migrate_use_xbzrle()) {
 859                 return -EINVAL;
 860             }
 861             void *host = host_from_stream_offset(f, addr, flags);
 862             if (!host) {
 863                 return -EINVAL;
 864             }
 865
 866             if (load_xbzrle(f, addr, host) < 0) {
 867                 ret = -EINVAL;
 868                 goto done;
 869             }
 870         }
 871         error = qemu_file_get_error(f);
 872         if (error) {
 873             ret = error;
 874             goto done;
 875         }
 876     } while (!(flags & RAM_SAVE_FLAG_EOS));
 877
 878 done:
 879     DPRINTF("Completed load of VM with exit code %d seq iteration "
 880             "%" PRIu64 "\n", ret, seq_iter);
 881     return ret;
 882 }
 883
 884 SaveVMHandlers savevm_ram_handlers = {
 885     .save_live_setup = ram_save_setup,
 886     .save_live_iterate = ram_save_iterate,
 887     .save_live_complete = ram_save_complete,
 888     .load_state = ram_load,
 889     .cancel = ram_migration_cancel,
 890 };
 891
 892 #ifdef HAS_AUDIO
 893 struct soundhw {
 894     const char *name;
 895     const char *descr;
 896     int enabled;
 897     int isa;
 898     union {
 899         int (*init_isa) (ISABus *bus);
 900         int (*init_pci) (PCIBus *bus);
 901     } init;
 902 };
 903
 904 static struct soundhw soundhw[] = {
 905 #ifdef HAS_AUDIO_CHOICE
 906 #ifdef CONFIG_PCSPK
 907     {
 908         "pcspk",
 909         "PC speaker",
 910         0,
 911         1,
 912         { .init_isa = pcspk_audio_init }
 913     },
 914 #endif
 915
 916 #ifdef CONFIG_SB16
 917     {
 918         "sb16",
 919         "Creative Sound Blaster 16",
 920         0,
 921         1,
 922         { .init_isa = SB16_init }
 923     },
 924 #endif
 925
 926 #ifdef CONFIG_CS4231A
 927     {
 928         "cs4231a",
 929         "CS4231A",
 930         0,
 931         1,
 932         { .init_isa = cs4231a_init }
 933     },
 934 #endif
 935
 936 #ifdef CONFIG_ADLIB
 937     {
 938         "adlib",
 939 #ifdef HAS_YMF262
 940         "Yamaha YMF262 (OPL3)",
 941 #else
 942         "Yamaha YM3812 (OPL2)",
 943 #endif
 944         0,
 945         1,
 946         { .init_isa = Adlib_init }
 947     },
 948 #endif
 949
 950 #ifdef CONFIG_GUS
 951     {
 952         "gus",
 953         "Gravis Ultrasound GF1",
 954         0,
 955         1,
 956         { .init_isa = GUS_init }
 957     },
 958 #endif
 959
 960 #ifdef CONFIG_AC97
 961     {
 962         "ac97",
 963         "Intel 82801AA AC97 Audio",
 964         0,
 965         0,
 966         { .init_pci = ac97_init }
 967     },
 968 #endif
 969
 970 #ifdef CONFIG_ES1370
 971     {
 972         "es1370",
 973         "ENSONIQ AudioPCI ES1370",
 974         0,
 975         0,
 976         { .init_pci = es1370_init }
 977     },
 978 #endif
 979
 980 #ifdef CONFIG_HDA
 981     {
 982         "hda",
 983         "Intel HD Audio",
 984         0,
 985         0,
 986         { .init_pci = intel_hda_and_codec_init }
 987     },
 988 #endif
 989
 990 #endif /* HAS_AUDIO_CHOICE */
 991
 992     { NULL, NULL, 0, 0, { NULL } }
 993 };
 994
 995 void select_soundhw(const char *optarg)
 996 {
 997     struct soundhw *c;
 998
 999     if (is_help_option(optarg)) {
1000     show_valid_cards:
1001
1002 #ifdef HAS_AUDIO_CHOICE
1003         printf("Valid sound card names (comma separated):\n");
1004         for (c = soundhw; c->name; ++c) {
1005             printf ("%-11s %s\n", c->name, c->descr);
1006         }
1007         printf("\n-soundhw all will enable all of the above\n");
1008 #else
1009         printf("Machine has no user-selectable audio hardware "
1010                "(it may or may not have always-present audio hardware).\n");
1011 #endif
1012         exit(!is_help_option(optarg));
1013     }
1014     else {
1015         size_t l;
1016         const char *p;
1017         char *e;
1018         int bad_card = 0;
1019
1020         if (!strcmp(optarg, "all")) {
1021             for (c = soundhw; c->name; ++c) {
1022                 c->enabled = 1;
1023             }
1024             return;
1025         }
1026
1027         p = optarg;
1028         while (*p) {
1029             e = strchr(p, ',');
1030             l = !e ? strlen(p) : (size_t) (e - p);
1031
1032             for (c = soundhw; c->name; ++c) {
1033                 if (!strncmp(c->name, p, l) && !c->name[l]) {
1034                     c->enabled = 1;
1035                     break;
1036                 }
1037             }
1038
1039             if (!c->name) {
1040                 if (l > 80) {
1041                     fprintf(stderr,
1042                             "Unknown sound card name (too big to show)\n");
1043                 }
1044                 else {
1045                     fprintf(stderr, "Unknown sound card name `%.*s'\n",
1046                             (int) l, p);
1047                 }
1048                 bad_card = 1;
1049             }
1050             p += l + (e != NULL);
1051         }
1052
1053         if (bad_card) {
1054             goto show_valid_cards;
1055         }
1056     }
1057 }
1058
1059 void audio_init(ISABus *isa_bus, PCIBus *pci_bus)
1060 {
1061     struct soundhw *c;
1062
1063     for (c = soundhw; c->name; ++c) {
1064         if (c->enabled) {
1065             if (c->isa) {
1066                 if (isa_bus) {
1067                     c->init.init_isa(isa_bus);
1068                 }
1069             } else {
1070                 if (pci_bus) {
1071                     c->init.init_pci(pci_bus);
1072                 }
1073             }
1074         }
1075     }
1076 }
1077 #else
1078 void select_soundhw(const char *optarg)
1079 {
1080 }
1081 void audio_init(ISABus *isa_bus, PCIBus *pci_bus)
1082 {
1083 }
1084 #endif
1085
1086 int qemu_uuid_parse(const char *str, uint8_t *uuid)
1087 {
1088     int ret;
1089
1090     if (strlen(str) != 36) {
1091         return -1;
1092     }
1093
1094     ret = sscanf(str, UUID_FMT, &uuid[0], &uuid[1], &uuid[2], &uuid[3],
1095                  &uuid[4], &uuid[5], &uuid[6], &uuid[7], &uuid[8], &uuid[9],
1096                  &uuid[10], &uuid[11], &uuid[12], &uuid[13], &uuid[14],
1097                  &uuid[15]);
1098
1099     if (ret != 16) {
1100         return -1;
1101     }
1102 #ifdef TARGET_I386
1103     smbios_add_field(1, offsetof(struct smbios_type_1, uuid), 16, uuid);
1104 #endif
1105     return 0;
1106 }
1107
1108 void do_acpitable_option(const char *optarg)
1109 {
1110 #ifdef TARGET_I386
1111     if (acpi_table_add(optarg) < 0) {
1112         fprintf(stderr, "Wrong acpi table provided\n");
1113         exit(1);
1114     }
1115 #endif
1116 }
1117
1118 void do_smbios_option(const char *optarg)
1119 {
1120 #ifdef TARGET_I386
1121     if (smbios_entry_add(optarg) < 0) {
1122         fprintf(stderr, "Wrong smbios provided\n");
1123         exit(1);
1124     }
1125 #endif
1126 }
1127
1128 void cpudef_init(void)
1129 {
1130 #if defined(cpudef_setup)
1131     cpudef_setup(); /* parse cpu definitions in target config file */
1132 #endif
1133 }
1134
1135 int audio_available(void)
1136 {
1137 #ifdef HAS_AUDIO
1138     return 1;
1139 #else
1140     return 0;
1141 #endif
1142 }
1143
1144 int tcg_available(void)
1145 {
1146     return 1;
1147 }
1148
1149 int kvm_available(void)
1150 {
1151 #ifdef CONFIG_KVM
1152     return 1;
1153 #else
1154     return 0;
1155 #endif
1156 }
1157
1158 int xen_available(void)
1159 {
1160 #ifdef CONFIG_XEN
1161     return 1;
1162 #else
1163     return 0;
1164 #endif
1165 }
1166
1167
1168 TargetInfo *qmp_query_target(Error **errp)
1169 {
1170     TargetInfo *info = g_malloc0(sizeof(*info));
1171
1172     info->arch = TARGET_TYPE;
1173
1174     return info;
1175 }