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