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/i386/pc.h"
  39 #include "hw/pci/pci.h"
  40 #include "hw/audio/audio.h"
  41 #include "sysemu/kvm.h"
  42 #include "migration/migration.h"
  43 #include "hw/i386/smbios.h"
  44 #include "exec/address-spaces.h"
  45 #include "hw/audio/pcspk.h"
  46 #include "migration/page_cache.h"
  47 #include "qemu/config-file.h"
  48 #include "qmp-commands.h"
  49 #include "trace.h"
  50 #include "exec/cpu-all.h"
  51 #include "hw/acpi/acpi.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 = 32;
  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_MOXIE)
  89 #define QEMU_ARCH QEMU_ARCH_MOXIE
  90 #elif defined(TARGET_OPENRISC)
  91 #define QEMU_ARCH QEMU_ARCH_OPENRISC
  92 #elif defined(TARGET_PPC)
  93 #define QEMU_ARCH QEMU_ARCH_PPC
  94 #elif defined(TARGET_S390X)
  95 #define QEMU_ARCH QEMU_ARCH_S390X
  96 #elif defined(TARGET_SH4)
  97 #define QEMU_ARCH QEMU_ARCH_SH4
  98 #elif defined(TARGET_SPARC)
  99 #define QEMU_ARCH QEMU_ARCH_SPARC
 100 #elif defined(TARGET_XTENSA)
 101 #define QEMU_ARCH QEMU_ARCH_XTENSA
 102 #elif defined(TARGET_UNICORE32)
 103 #define QEMU_ARCH QEMU_ARCH_UNICORE32
 104 #endif
 105
 106 const uint32_t arch_type = QEMU_ARCH;
 107 static bool mig_throttle_on;
 108 static int dirty_rate_high_cnt;
 109 static void check_guest_throttling(void);
 110
 111 /***********************************************************/
 112 /* ram save/restore */
 113
 114 #define RAM_SAVE_FLAG_FULL     0x01 /* Obsolete, not used anymore */
 115 #define RAM_SAVE_FLAG_COMPRESS 0x02
 116 #define RAM_SAVE_FLAG_MEM_SIZE 0x04
 117 #define RAM_SAVE_FLAG_PAGE     0x08
 118 #define RAM_SAVE_FLAG_EOS      0x10
 119 #define RAM_SAVE_FLAG_CONTINUE 0x20
 120 #define RAM_SAVE_FLAG_XBZRLE   0x40
 121 /* 0x80 is reserved in migration.h start with 0x100 next */
 122
 123
 124 static struct defconfig_file {
 125     const char *filename;
 126     /* Indicates it is an user config file (disabled by -no-user-config) */
 127     bool userconfig;
 128 } default_config_files[] = {
 129     { CONFIG_QEMU_CONFDIR "/qemu.conf",                   true },
 130     { CONFIG_QEMU_CONFDIR "/target-" TARGET_NAME ".conf", true },
 131     { NULL }, /* end of list */
 132 };
 133
 134
 135 int qemu_read_default_config_files(bool userconfig)
 136 {
 137     int ret;
 138     struct defconfig_file *f;
 139
 140     for (f = default_config_files; f->filename; f++) {
 141         if (!userconfig && f->userconfig) {
 142             continue;
 143         }
 144         ret = qemu_read_config_file(f->filename);
 145         if (ret < 0 && ret != -ENOENT) {
 146             return ret;
 147         }
 148     }
 149
 150     return 0;
 151 }
 152
 153 static inline bool is_zero_range(uint8_t *p, uint64_t size)
 154 {
 155     return buffer_find_nonzero_offset(p, size) == size;
 156 }
 157
 158 /* struct contains XBZRLE cache and a static page
 159    used by the compression */
 160 static struct {
 161     /* buffer used for XBZRLE encoding */
 162     uint8_t *encoded_buf;
 163     /* buffer for storing page content */
 164     uint8_t *current_buf;
 165     /* buffer used for XBZRLE decoding */
 166     uint8_t *decoded_buf;
 167     /* Cache for XBZRLE */
 168     PageCache *cache;
 169 } XBZRLE = {
 170     .encoded_buf = NULL,
 171     .current_buf = NULL,
 172     .decoded_buf = NULL,
 173     .cache = NULL,
 174 };
 175
 176
 177 int64_t xbzrle_cache_resize(int64_t new_size)
 178 {
 179     if (XBZRLE.cache != NULL) {
 180         return cache_resize(XBZRLE.cache, new_size / TARGET_PAGE_SIZE) *
 181             TARGET_PAGE_SIZE;
 182     }
 183     return pow2floor(new_size);
 184 }
 185
 186 /* accounting for migration statistics */
 187 typedef struct AccountingInfo {
 188     uint64_t dup_pages;
 189     uint64_t skipped_pages;
 190     uint64_t norm_pages;
 191     uint64_t iterations;
 192     uint64_t xbzrle_bytes;
 193     uint64_t xbzrle_pages;
 194     uint64_t xbzrle_cache_miss;
 195     uint64_t xbzrle_overflows;
 196 } AccountingInfo;
 197
 198 static AccountingInfo acct_info;
 199
 200 static void acct_clear(void)
 201 {
 202     memset(&acct_info, 0, sizeof(acct_info));
 203 }
 204
 205 uint64_t dup_mig_bytes_transferred(void)
 206 {
 207     return acct_info.dup_pages * TARGET_PAGE_SIZE;
 208 }
 209
 210 uint64_t dup_mig_pages_transferred(void)
 211 {
 212     return acct_info.dup_pages;
 213 }
 214
 215 uint64_t skipped_mig_bytes_transferred(void)
 216 {
 217     return acct_info.skipped_pages * TARGET_PAGE_SIZE;
 218 }
 219
 220 uint64_t skipped_mig_pages_transferred(void)
 221 {
 222     return acct_info.skipped_pages;
 223 }
 224
 225 uint64_t norm_mig_bytes_transferred(void)
 226 {
 227     return acct_info.norm_pages * TARGET_PAGE_SIZE;
 228 }
 229
 230 uint64_t norm_mig_pages_transferred(void)
 231 {
 232     return acct_info.norm_pages;
 233 }
 234
 235 uint64_t xbzrle_mig_bytes_transferred(void)
 236 {
 237     return acct_info.xbzrle_bytes;
 238 }
 239
 240 uint64_t xbzrle_mig_pages_transferred(void)
 241 {
 242     return acct_info.xbzrle_pages;
 243 }
 244
 245 uint64_t xbzrle_mig_pages_cache_miss(void)
 246 {
 247     return acct_info.xbzrle_cache_miss;
 248 }
 249
 250 uint64_t xbzrle_mig_pages_overflow(void)
 251 {
 252     return acct_info.xbzrle_overflows;
 253 }
 254
 255 static size_t save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
 256                              int cont, int flag)
 257 {
 258     size_t size;
 259
 260     qemu_put_be64(f, offset | cont | flag);
 261     size = 8;
 262
 263     if (!cont) {
 264         qemu_put_byte(f, strlen(block->idstr));
 265         qemu_put_buffer(f, (uint8_t *)block->idstr,
 266                         strlen(block->idstr));
 267         size += 1 + strlen(block->idstr);
 268     }
 269     return size;
 270 }
 271
 272 #define ENCODING_FLAG_XBZRLE 0x1
 273
 274 static int save_xbzrle_page(QEMUFile *f, uint8_t *current_data,
 275                             ram_addr_t current_addr, RAMBlock *block,
 276                             ram_addr_t offset, int cont, bool last_stage)
 277 {
 278     int encoded_len = 0, bytes_sent = -1;
 279     uint8_t *prev_cached_page;
 280
 281     if (!cache_is_cached(XBZRLE.cache, current_addr)) {
 282         if (!last_stage) {
 283             cache_insert(XBZRLE.cache, current_addr, current_data);
 284         }
 285         acct_info.xbzrle_cache_miss++;
 286         return -1;
 287     }
 288
 289     prev_cached_page = get_cached_data(XBZRLE.cache, current_addr);
 290
 291     /* save current buffer into memory */
 292     memcpy(XBZRLE.current_buf, current_data, TARGET_PAGE_SIZE);
 293
 294     /* XBZRLE encoding (if there is no overflow) */
 295     encoded_len = xbzrle_encode_buffer(prev_cached_page, XBZRLE.current_buf,
 296                                        TARGET_PAGE_SIZE, XBZRLE.encoded_buf,
 297                                        TARGET_PAGE_SIZE);
 298     if (encoded_len == 0) {
 299         DPRINTF("Skipping unmodified page\n");
 300         return 0;
 301     } else if (encoded_len == -1) {
 302         DPRINTF("Overflow\n");
 303         acct_info.xbzrle_overflows++;
 304         /* update data in the cache */
 305         memcpy(prev_cached_page, current_data, TARGET_PAGE_SIZE);
 306         return -1;
 307     }
 308
 309     /* we need to update the data in the cache, in order to get the same data */
 310     if (!last_stage) {
 311         memcpy(prev_cached_page, XBZRLE.current_buf, TARGET_PAGE_SIZE);
 312     }
 313
 314     /* Send XBZRLE based compressed page */
 315     bytes_sent = save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_XBZRLE);
 316     qemu_put_byte(f, ENCODING_FLAG_XBZRLE);
 317     qemu_put_be16(f, encoded_len);
 318     qemu_put_buffer(f, XBZRLE.encoded_buf, encoded_len);
 319     bytes_sent += encoded_len + 1 + 2;
 320     acct_info.xbzrle_pages++;
 321     acct_info.xbzrle_bytes += bytes_sent;
 322
 323     return bytes_sent;
 324 }
 325
 326
 327 /* This is the last block that we have visited serching for dirty pages
 328  */
 329 static RAMBlock *last_seen_block;
 330 /* This is the last block from where we have sent data */
 331 static RAMBlock *last_sent_block;
 332 static ram_addr_t last_offset;
 333 static unsigned long *migration_bitmap;
 334 static uint64_t migration_dirty_pages;
 335 static uint32_t last_version;
 336 static bool ram_bulk_stage;
 337
 338 static inline
 339 ram_addr_t migration_bitmap_find_and_reset_dirty(MemoryRegion *mr,
 340                                                  ram_addr_t start)
 341 {
 342     unsigned long base = mr->ram_addr >> TARGET_PAGE_BITS;
 343     unsigned long nr = base + (start >> TARGET_PAGE_BITS);
 344     uint64_t mr_size = TARGET_PAGE_ALIGN(memory_region_size(mr));
 345     unsigned long size = base + (mr_size >> TARGET_PAGE_BITS);
 346
 347     unsigned long next;
 348
 349     if (ram_bulk_stage && nr > base) {
 350         next = nr + 1;
 351     } else {
 352         next = find_next_bit(migration_bitmap, size, nr);
 353     }
 354
 355     if (next < size) {
 356         clear_bit(next, migration_bitmap);
 357         migration_dirty_pages--;
 358     }
 359     return (next - base) << TARGET_PAGE_BITS;
 360 }
 361
 362 static inline bool migration_bitmap_set_dirty(MemoryRegion *mr,
 363                                               ram_addr_t offset)
 364 {
 365     bool ret;
 366     int nr = (mr->ram_addr + offset) >> TARGET_PAGE_BITS;
 367
 368     ret = test_and_set_bit(nr, migration_bitmap);
 369
 370     if (!ret) {
 371         migration_dirty_pages++;
 372     }
 373     return ret;
 374 }
 375
 376 /* Needs iothread lock! */
 377
 378 static void migration_bitmap_sync(void)
 379 {
 380     RAMBlock *block;
 381     ram_addr_t addr;
 382     uint64_t num_dirty_pages_init = migration_dirty_pages;
 383     MigrationState *s = migrate_get_current();
 384     static int64_t start_time;
 385     static int64_t bytes_xfer_prev;
 386     static int64_t num_dirty_pages_period;
 387     int64_t end_time;
 388     int64_t bytes_xfer_now;
 389
 390     if (!bytes_xfer_prev) {
 391         bytes_xfer_prev = ram_bytes_transferred();
 392     }
 393
 394     if (!start_time) {
 395         start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
 396     }
 397
 398     trace_migration_bitmap_sync_start();
 399     address_space_sync_dirty_bitmap(&address_space_memory);
 400
 401     QTAILQ_FOREACH(block, &ram_list.blocks, next) {
 402         for (addr = 0; addr < block->length; addr += TARGET_PAGE_SIZE) {
 403             if (memory_region_test_and_clear_dirty(block->mr,
 404                                                    addr, TARGET_PAGE_SIZE,
 405                                                    DIRTY_MEMORY_MIGRATION)) {
 406                 migration_bitmap_set_dirty(block->mr, addr);
 407             }
 408         }
 409     }
 410     trace_migration_bitmap_sync_end(migration_dirty_pages
 411                                     - num_dirty_pages_init);
 412     num_dirty_pages_period += migration_dirty_pages - num_dirty_pages_init;
 413     end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
 414
 415     /* more than 1 second = 1000 millisecons */
 416     if (end_time > start_time + 1000) {
 417         if (migrate_auto_converge()) {
 418             /* The following detection logic can be refined later. For now:
 419                Check to see if the dirtied bytes is 50% more than the approx.
 420                amount of bytes that just got transferred since the last time we
 421                were in this routine. If that happens >N times (for now N==4)
 422                we turn on the throttle down logic */
 423             bytes_xfer_now = ram_bytes_transferred();
 424             if (s->dirty_pages_rate &&
 425                (num_dirty_pages_period * TARGET_PAGE_SIZE >
 426                    (bytes_xfer_now - bytes_xfer_prev)/2) &&
 427                (dirty_rate_high_cnt++ > 4)) {
 428                     trace_migration_throttle();
 429                     mig_throttle_on = true;
 430                     dirty_rate_high_cnt = 0;
 431              }
 432              bytes_xfer_prev = bytes_xfer_now;
 433         } else {
 434              mig_throttle_on = false;
 435         }
 436         s->dirty_pages_rate = num_dirty_pages_period * 1000
 437             / (end_time - start_time);
 438         s->dirty_bytes_rate = s->dirty_pages_rate * TARGET_PAGE_SIZE;
 439         start_time = end_time;
 440         num_dirty_pages_period = 0;
 441     }
 442 }
 443
 444 /*
 445  * ram_save_block: Writes a page of memory to the stream f
 446  *
 447  * Returns:  The number of bytes written.
 448  *           0 means no dirty pages
 449  */
 450
 451 static int ram_save_block(QEMUFile *f, bool last_stage)
 452 {
 453     RAMBlock *block = last_seen_block;
 454     ram_addr_t offset = last_offset;
 455     bool complete_round = false;
 456     int bytes_sent = 0;
 457     MemoryRegion *mr;
 458     ram_addr_t current_addr;
 459
 460     if (!block)
 461         block = QTAILQ_FIRST(&ram_list.blocks);
 462
 463     while (true) {
 464         mr = block->mr;
 465         offset = migration_bitmap_find_and_reset_dirty(mr, offset);
 466         if (complete_round && block == last_seen_block &&
 467             offset >= last_offset) {
 468             break;
 469         }
 470         if (offset >= block->length) {
 471             offset = 0;
 472             block = QTAILQ_NEXT(block, next);
 473             if (!block) {
 474                 block = QTAILQ_FIRST(&ram_list.blocks);
 475                 complete_round = true;
 476                 ram_bulk_stage = false;
 477             }
 478         } else {
 479             int ret;
 480             uint8_t *p;
 481             int cont = (block == last_sent_block) ?
 482                 RAM_SAVE_FLAG_CONTINUE : 0;
 483
 484             p = memory_region_get_ram_ptr(mr) + offset;
 485
 486             /* In doubt sent page as normal */
 487             bytes_sent = -1;
 488             ret = ram_control_save_page(f, block->offset,
 489                                offset, TARGET_PAGE_SIZE, &bytes_sent);
 490
 491             if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
 492                 if (ret != RAM_SAVE_CONTROL_DELAYED) {
 493                     if (bytes_sent > 0) {
 494                         acct_info.norm_pages++;
 495                     } else if (bytes_sent == 0) {
 496                         acct_info.dup_pages++;
 497                     }
 498                 }
 499             } else if (is_zero_range(p, TARGET_PAGE_SIZE)) {
 500                 acct_info.dup_pages++;
 501                 bytes_sent = save_block_hdr(f, block, offset, cont,
 502                                             RAM_SAVE_FLAG_COMPRESS);
 503                 qemu_put_byte(f, 0);
 504                 bytes_sent++;
 505             } else if (!ram_bulk_stage && migrate_use_xbzrle()) {
 506                 current_addr = block->offset + offset;
 507                 bytes_sent = save_xbzrle_page(f, p, current_addr, block,
 508                                               offset, cont, last_stage);
 509                 if (!last_stage) {
 510                     p = get_cached_data(XBZRLE.cache, current_addr);
 511                 }
 512             }
 513
 514             /* XBZRLE overflow or normal page */
 515             if (bytes_sent == -1) {
 516                 bytes_sent = save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
 517                 qemu_put_buffer_async(f, p, TARGET_PAGE_SIZE);
 518                 bytes_sent += TARGET_PAGE_SIZE;
 519                 acct_info.norm_pages++;
 520             }
 521
 522             /* if page is unmodified, continue to the next */
 523             if (bytes_sent > 0) {
 524                 last_sent_block = block;
 525                 break;
 526             }
 527         }
 528     }
 529     last_seen_block = block;
 530     last_offset = offset;
 531
 532     return bytes_sent;
 533 }
 534
 535 static uint64_t bytes_transferred;
 536
 537 void acct_update_position(QEMUFile *f, size_t size, bool zero)
 538 {
 539     uint64_t pages = size / TARGET_PAGE_SIZE;
 540     if (zero) {
 541         acct_info.dup_pages += pages;
 542     } else {
 543         acct_info.norm_pages += pages;
 544         bytes_transferred += size;
 545         qemu_update_position(f, size);
 546     }
 547 }
 548
 549 static ram_addr_t ram_save_remaining(void)
 550 {
 551     return migration_dirty_pages;
 552 }
 553
 554 uint64_t ram_bytes_remaining(void)
 555 {
 556     return ram_save_remaining() * TARGET_PAGE_SIZE;
 557 }
 558
 559 uint64_t ram_bytes_transferred(void)
 560 {
 561     return bytes_transferred;
 562 }
 563
 564 uint64_t ram_bytes_total(void)
 565 {
 566     RAMBlock *block;
 567     uint64_t total = 0;
 568
 569     QTAILQ_FOREACH(block, &ram_list.blocks, next)
 570         total += block->length;
 571
 572     return total;
 573 }
 574
 575 static void migration_end(void)
 576 {
 577     if (migration_bitmap) {
 578         memory_global_dirty_log_stop();
 579         g_free(migration_bitmap);
 580         migration_bitmap = NULL;
 581     }
 582
 583     if (XBZRLE.cache) {
 584         cache_fini(XBZRLE.cache);
 585         g_free(XBZRLE.cache);
 586         g_free(XBZRLE.encoded_buf);
 587         g_free(XBZRLE.current_buf);
 588         g_free(XBZRLE.decoded_buf);
 589         XBZRLE.cache = NULL;
 590     }
 591 }
 592
 593 static void ram_migration_cancel(void *opaque)
 594 {
 595     migration_end();
 596 }
 597
 598 static void reset_ram_globals(void)
 599 {
 600     last_seen_block = NULL;
 601     last_sent_block = NULL;
 602     last_offset = 0;
 603     last_version = ram_list.version;
 604     ram_bulk_stage = true;
 605 }
 606
 607 #define MAX_WAIT 50 /* ms, half buffered_file limit */
 608
 609 static int ram_save_setup(QEMUFile *f, void *opaque)
 610 {
 611     RAMBlock *block;
 612     int64_t ram_pages = last_ram_offset() >> TARGET_PAGE_BITS;
 613
 614     migration_bitmap = bitmap_new(ram_pages);
 615     bitmap_set(migration_bitmap, 0, ram_pages);
 616     migration_dirty_pages = ram_pages;
 617     mig_throttle_on = false;
 618     dirty_rate_high_cnt = 0;
 619
 620     if (migrate_use_xbzrle()) {
 621         XBZRLE.cache = cache_init(migrate_xbzrle_cache_size() /
 622                                   TARGET_PAGE_SIZE,
 623                                   TARGET_PAGE_SIZE);
 624         if (!XBZRLE.cache) {
 625             DPRINTF("Error creating cache\n");
 626             return -1;
 627         }
 628         XBZRLE.encoded_buf = g_malloc0(TARGET_PAGE_SIZE);
 629         XBZRLE.current_buf = g_malloc(TARGET_PAGE_SIZE);
 630         acct_clear();
 631     }
 632
 633     qemu_mutex_lock_iothread();
 634     qemu_mutex_lock_ramlist();
 635     bytes_transferred = 0;
 636     reset_ram_globals();
 637
 638     memory_global_dirty_log_start();
 639     migration_bitmap_sync();
 640     qemu_mutex_unlock_iothread();
 641
 642     qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
 643
 644     QTAILQ_FOREACH(block, &ram_list.blocks, next) {
 645         qemu_put_byte(f, strlen(block->idstr));
 646         qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr));
 647         qemu_put_be64(f, block->length);
 648     }
 649
 650     qemu_mutex_unlock_ramlist();
 651
 652     ram_control_before_iterate(f, RAM_CONTROL_SETUP);
 653     ram_control_after_iterate(f, RAM_CONTROL_SETUP);
 654
 655     qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
 656
 657     return 0;
 658 }
 659
 660 static int ram_save_iterate(QEMUFile *f, void *opaque)
 661 {
 662     int ret;
 663     int i;
 664     int64_t t0;
 665     int total_sent = 0;
 666
 667     qemu_mutex_lock_ramlist();
 668
 669     if (ram_list.version != last_version) {
 670         reset_ram_globals();
 671     }
 672
 673     ram_control_before_iterate(f, RAM_CONTROL_ROUND);
 674
 675     t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
 676     i = 0;
 677     while ((ret = qemu_file_rate_limit(f)) == 0) {
 678         int bytes_sent;
 679
 680         bytes_sent = ram_save_block(f, false);
 681         /* no more blocks to sent */
 682         if (bytes_sent == 0) {
 683             break;
 684         }
 685         total_sent += bytes_sent;
 686         acct_info.iterations++;
 687         check_guest_throttling();
 688         /* we want to check in the 1st loop, just in case it was the 1st time
 689            and we had to sync the dirty bitmap.
 690            qemu_get_clock_ns() is a bit expensive, so we only check each some
 691            iterations
 692         */
 693         if ((i & 63) == 0) {
 694             uint64_t t1 = (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - t0) / 1000000;
 695             if (t1 > MAX_WAIT) {
 696                 DPRINTF("big wait: %" PRIu64 " milliseconds, %d iterations\n",
 697                         t1, i);
 698                 break;
 699             }
 700         }
 701         i++;
 702     }
 703
 704     qemu_mutex_unlock_ramlist();
 705
 706     /*
 707      * Must occur before EOS (or any QEMUFile operation)
 708      * because of RDMA protocol.
 709      */
 710     ram_control_after_iterate(f, RAM_CONTROL_ROUND);
 711
 712     bytes_transferred += total_sent;
 713
 714     /*
 715      * Do not count these 8 bytes into total_sent, so that we can
 716      * return 0 if no page had been dirtied.
 717      */
 718     qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
 719     bytes_transferred += 8;
 720
 721     ret = qemu_file_get_error(f);
 722     if (ret < 0) {
 723         return ret;
 724     }
 725
 726     return total_sent;
 727 }
 728
 729 static int ram_save_complete(QEMUFile *f, void *opaque)
 730 {
 731     qemu_mutex_lock_ramlist();
 732     migration_bitmap_sync();
 733
 734     ram_control_before_iterate(f, RAM_CONTROL_FINISH);
 735
 736     /* try transferring iterative blocks of memory */
 737
 738     /* flush all remaining blocks regardless of rate limiting */
 739     while (true) {
 740         int bytes_sent;
 741
 742         bytes_sent = ram_save_block(f, true);
 743         /* no more blocks to sent */
 744         if (bytes_sent == 0) {
 745             break;
 746         }
 747         bytes_transferred += bytes_sent;
 748     }
 749
 750     ram_control_after_iterate(f, RAM_CONTROL_FINISH);
 751     migration_end();
 752
 753     qemu_mutex_unlock_ramlist();
 754     qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
 755
 756     return 0;
 757 }
 758
 759 static uint64_t ram_save_pending(QEMUFile *f, void *opaque, uint64_t max_size)
 760 {
 761     uint64_t remaining_size;
 762
 763     remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE;
 764
 765     if (remaining_size < max_size) {
 766         qemu_mutex_lock_iothread();
 767         migration_bitmap_sync();
 768         qemu_mutex_unlock_iothread();
 769         remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE;
 770     }
 771     return remaining_size;
 772 }
 773
 774 static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host)
 775 {
 776     int ret, rc = 0;
 777     unsigned int xh_len;
 778     int xh_flags;
 779
 780     if (!XBZRLE.decoded_buf) {
 781         XBZRLE.decoded_buf = g_malloc(TARGET_PAGE_SIZE);
 782     }
 783
 784     /* extract RLE header */
 785     xh_flags = qemu_get_byte(f);
 786     xh_len = qemu_get_be16(f);
 787
 788     if (xh_flags != ENCODING_FLAG_XBZRLE) {
 789         fprintf(stderr, "Failed to load XBZRLE page - wrong compression!\n");
 790         return -1;
 791     }
 792
 793     if (xh_len > TARGET_PAGE_SIZE) {
 794         fprintf(stderr, "Failed to load XBZRLE page - len overflow!\n");
 795         return -1;
 796     }
 797     /* load data and decode */
 798     qemu_get_buffer(f, XBZRLE.decoded_buf, xh_len);
 799
 800     /* decode RLE */
 801     ret = xbzrle_decode_buffer(XBZRLE.decoded_buf, xh_len, host,
 802                                TARGET_PAGE_SIZE);
 803     if (ret == -1) {
 804         fprintf(stderr, "Failed to load XBZRLE page - decode error!\n");
 805         rc = -1;
 806     } else  if (ret > TARGET_PAGE_SIZE) {
 807         fprintf(stderr, "Failed to load XBZRLE page - size %d exceeds %d!\n",
 808                 ret, TARGET_PAGE_SIZE);
 809         abort();
 810     }
 811
 812     return rc;
 813 }
 814
 815 static inline void *host_from_stream_offset(QEMUFile *f,
 816                                             ram_addr_t offset,
 817                                             int flags)
 818 {
 819     static RAMBlock *block = NULL;
 820     char id[256];
 821     uint8_t len;
 822
 823     if (flags & RAM_SAVE_FLAG_CONTINUE) {
 824         if (!block) {
 825             fprintf(stderr, "Ack, bad migration stream!\n");
 826             return NULL;
 827         }
 828
 829         return memory_region_get_ram_ptr(block->mr) + offset;
 830     }
 831
 832     len = qemu_get_byte(f);
 833     qemu_get_buffer(f, (uint8_t *)id, len);
 834     id[len] = 0;
 835
 836     QTAILQ_FOREACH(block, &ram_list.blocks, next) {
 837         if (!strncmp(id, block->idstr, sizeof(id)))
 838             return memory_region_get_ram_ptr(block->mr) + offset;
 839     }
 840
 841     fprintf(stderr, "Can't find block %s!\n", id);
 842     return NULL;
 843 }
 844
 845 /*
 846  * If a page (or a whole RDMA chunk) has been
 847  * determined to be zero, then zap it.
 848  */
 849 void ram_handle_compressed(void *host, uint8_t ch, uint64_t size)
 850 {
 851     if (ch != 0 || !is_zero_range(host, size)) {
 852         memset(host, ch, size);
 853     }
 854 }
 855
 856 static int ram_load(QEMUFile *f, void *opaque, int version_id)
 857 {
 858     ram_addr_t addr;
 859     int flags, ret = 0;
 860     int error;
 861     static uint64_t seq_iter;
 862
 863     seq_iter++;
 864
 865     if (version_id < 4 || version_id > 4) {
 866         return -EINVAL;
 867     }
 868
 869     do {
 870         addr = qemu_get_be64(f);
 871
 872         flags = addr & ~TARGET_PAGE_MASK;
 873         addr &= TARGET_PAGE_MASK;
 874
 875         if (flags & RAM_SAVE_FLAG_MEM_SIZE) {
 876             if (version_id == 4) {
 877                 /* Synchronize RAM block list */
 878                 char id[256];
 879                 ram_addr_t length;
 880                 ram_addr_t total_ram_bytes = addr;
 881
 882                 while (total_ram_bytes) {
 883                     RAMBlock *block;
 884                     uint8_t len;
 885
 886                     len = qemu_get_byte(f);
 887                     qemu_get_buffer(f, (uint8_t *)id, len);
 888                     id[len] = 0;
 889                     length = qemu_get_be64(f);
 890
 891                     QTAILQ_FOREACH(block, &ram_list.blocks, next) {
 892                         if (!strncmp(id, block->idstr, sizeof(id))) {
 893                             if (block->length != length) {
 894                                 fprintf(stderr,
 895                                         "Length mismatch: %s: " RAM_ADDR_FMT
 896                                         " in != " RAM_ADDR_FMT "\n", id, length,
 897                                         block->length);
 898                                 ret =  -EINVAL;
 899                                 goto done;
 900                             }
 901                             break;
 902                         }
 903                     }
 904
 905                     if (!block) {
 906                         fprintf(stderr, "Unknown ramblock \"%s\", cannot "
 907                                 "accept migration\n", id);
 908                         ret = -EINVAL;
 909                         goto done;
 910                     }
 911
 912                     total_ram_bytes -= length;
 913                 }
 914             }
 915         }
 916
 917         if (flags & RAM_SAVE_FLAG_COMPRESS) {
 918             void *host;
 919             uint8_t ch;
 920
 921             host = host_from_stream_offset(f, addr, flags);
 922             if (!host) {
 923                 return -EINVAL;
 924             }
 925
 926             ch = qemu_get_byte(f);
 927             ram_handle_compressed(host, ch, TARGET_PAGE_SIZE);
 928         } else if (flags & RAM_SAVE_FLAG_PAGE) {
 929             void *host;
 930
 931             host = host_from_stream_offset(f, addr, flags);
 932             if (!host) {
 933                 return -EINVAL;
 934             }
 935
 936             qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
 937         } else if (flags & RAM_SAVE_FLAG_XBZRLE) {
 938             void *host = host_from_stream_offset(f, addr, flags);
 939             if (!host) {
 940                 return -EINVAL;
 941             }
 942
 943             if (load_xbzrle(f, addr, host) < 0) {
 944                 ret = -EINVAL;
 945                 goto done;
 946             }
 947         } else if (flags & RAM_SAVE_FLAG_HOOK) {
 948             ram_control_load_hook(f, flags);
 949         }
 950         error = qemu_file_get_error(f);
 951         if (error) {
 952             ret = error;
 953             goto done;
 954         }
 955     } while (!(flags & RAM_SAVE_FLAG_EOS));
 956
 957 done:
 958     DPRINTF("Completed load of VM with exit code %d seq iteration "
 959             "%" PRIu64 "\n", ret, seq_iter);
 960     return ret;
 961 }
 962
 963 SaveVMHandlers savevm_ram_handlers = {
 964     .save_live_setup = ram_save_setup,
 965     .save_live_iterate = ram_save_iterate,
 966     .save_live_complete = ram_save_complete,
 967     .save_live_pending = ram_save_pending,
 968     .load_state = ram_load,
 969     .cancel = ram_migration_cancel,
 970 };
 971
 972 struct soundhw {
 973     const char *name;
 974     const char *descr;
 975     int enabled;
 976     int isa;
 977     union {
 978         int (*init_isa) (ISABus *bus);
 979         int (*init_pci) (PCIBus *bus);
 980     } init;
 981 };
 982
 983 static struct soundhw soundhw[9];
 984 static int soundhw_count;
 985
 986 void isa_register_soundhw(const char *name, const char *descr,
 987                           int (*init_isa)(ISABus *bus))
 988 {
 989     assert(soundhw_count < ARRAY_SIZE(soundhw) - 1);
 990     soundhw[soundhw_count].name = name;
 991     soundhw[soundhw_count].descr = descr;
 992     soundhw[soundhw_count].isa = 1;
 993     soundhw[soundhw_count].init.init_isa = init_isa;
 994     soundhw_count++;
 995 }
 996
 997 void pci_register_soundhw(const char *name, const char *descr,
 998                           int (*init_pci)(PCIBus *bus))
 999 {
1000     assert(soundhw_count < ARRAY_SIZE(soundhw) - 1);
1001     soundhw[soundhw_count].name = name;
1002     soundhw[soundhw_count].descr = descr;
1003     soundhw[soundhw_count].isa = 0;
1004     soundhw[soundhw_count].init.init_pci = init_pci;
1005     soundhw_count++;
1006 }
1007
1008 void select_soundhw(const char *optarg)
1009 {
1010     struct soundhw *c;
1011
1012     if (is_help_option(optarg)) {
1013     show_valid_cards:
1014
1015         if (soundhw_count) {
1016              printf("Valid sound card names (comma separated):\n");
1017              for (c = soundhw; c->name; ++c) {
1018                  printf ("%-11s %s\n", c->name, c->descr);
1019              }
1020              printf("\n-soundhw all will enable all of the above\n");
1021         } else {
1022              printf("Machine has no user-selectable audio hardware "
1023                     "(it may or may not have always-present audio hardware).\n");
1024         }
1025         exit(!is_help_option(optarg));
1026     }
1027     else {
1028         size_t l;
1029         const char *p;
1030         char *e;
1031         int bad_card = 0;
1032
1033         if (!strcmp(optarg, "all")) {
1034             for (c = soundhw; c->name; ++c) {
1035                 c->enabled = 1;
1036             }
1037             return;
1038         }
1039
1040         p = optarg;
1041         while (*p) {
1042             e = strchr(p, ',');
1043             l = !e ? strlen(p) : (size_t) (e - p);
1044
1045             for (c = soundhw; c->name; ++c) {
1046                 if (!strncmp(c->name, p, l) && !c->name[l]) {
1047                     c->enabled = 1;
1048                     break;
1049                 }
1050             }
1051
1052             if (!c->name) {
1053                 if (l > 80) {
1054                     fprintf(stderr,
1055                             "Unknown sound card name (too big to show)\n");
1056                 }
1057                 else {
1058                     fprintf(stderr, "Unknown sound card name `%.*s'\n",
1059                             (int) l, p);
1060                 }
1061                 bad_card = 1;
1062             }
1063             p += l + (e != NULL);
1064         }
1065
1066         if (bad_card) {
1067             goto show_valid_cards;
1068         }
1069     }
1070 }
1071
1072 void audio_init(void)
1073 {
1074     struct soundhw *c;
1075     ISABus *isa_bus = (ISABus *) object_resolve_path_type("", TYPE_ISA_BUS, NULL);
1076     PCIBus *pci_bus = (PCIBus *) object_resolve_path_type("", TYPE_PCI_BUS, NULL);
1077
1078     for (c = soundhw; c->name; ++c) {
1079         if (c->enabled) {
1080             if (c->isa) {
1081                 if (!isa_bus) {
1082                     fprintf(stderr, "ISA bus not available for %s\n", c->name);
1083                     exit(1);
1084                 }
1085                 c->init.init_isa(isa_bus);
1086             } else {
1087                 if (!pci_bus) {
1088                     fprintf(stderr, "PCI bus not available for %s\n", c->name);
1089                     exit(1);
1090                 }
1091                 c->init.init_pci(pci_bus);
1092             }
1093         }
1094     }
1095 }
1096
1097 int qemu_uuid_parse(const char *str, uint8_t *uuid)
1098 {
1099     int ret;
1100
1101     if (strlen(str) != 36) {
1102         return -1;
1103     }
1104
1105     ret = sscanf(str, UUID_FMT, &uuid[0], &uuid[1], &uuid[2], &uuid[3],
1106                  &uuid[4], &uuid[5], &uuid[6], &uuid[7], &uuid[8], &uuid[9],
1107                  &uuid[10], &uuid[11], &uuid[12], &uuid[13], &uuid[14],
1108                  &uuid[15]);
1109
1110     if (ret != 16) {
1111         return -1;
1112     }
1113     return 0;
1114 }
1115
1116 void do_acpitable_option(const QemuOpts *opts)
1117 {
1118 #ifdef TARGET_I386
1119     Error *err = NULL;
1120
1121     acpi_table_add(opts, &err);
1122     if (err) {
1123         error_report("Wrong acpi table provided: %s",
1124                      error_get_pretty(err));
1125         error_free(err);
1126         exit(1);
1127     }
1128 #endif
1129 }
1130
1131 void do_smbios_option(QemuOpts *opts)
1132 {
1133 #ifdef TARGET_I386
1134     smbios_entry_add(opts);
1135 #endif
1136 }
1137
1138 void cpudef_init(void)
1139 {
1140 #if defined(cpudef_setup)
1141     cpudef_setup(); /* parse cpu definitions in target config file */
1142 #endif
1143 }
1144
1145 int tcg_available(void)
1146 {
1147     return 1;
1148 }
1149
1150 int kvm_available(void)
1151 {
1152 #ifdef CONFIG_KVM
1153     return 1;
1154 #else
1155     return 0;
1156 #endif
1157 }
1158
1159 int xen_available(void)
1160 {
1161 #ifdef CONFIG_XEN
1162     return 1;
1163 #else
1164     return 0;
1165 #endif
1166 }
1167
1168
1169 TargetInfo *qmp_query_target(Error **errp)
1170 {
1171     TargetInfo *info = g_malloc0(sizeof(*info));
1172
1173     info->arch = g_strdup(TARGET_NAME);
1174
1175     return info;
1176 }
1177
1178 /* Stub function that's gets run on the vcpu when its brought out of the
1179    VM to run inside qemu via async_run_on_cpu()*/
1180 static void mig_sleep_cpu(void *opq)
1181 {
1182     qemu_mutex_unlock_iothread();
1183     g_usleep(30*1000);
1184     qemu_mutex_lock_iothread();
1185 }
1186
1187 /* To reduce the dirty rate explicitly disallow the VCPUs from spending
1188    much time in the VM. The migration thread will try to catchup.
1189    Workload will experience a performance drop.
1190 */
1191 static void mig_throttle_guest_down(void)
1192 {
1193     CPUState *cpu;
1194
1195     qemu_mutex_lock_iothread();
1196     CPU_FOREACH(cpu) {
1197         async_run_on_cpu(cpu, mig_sleep_cpu, NULL);
1198     }
1199     qemu_mutex_unlock_iothread();
1200 }
1201
1202 static void check_guest_throttling(void)
1203 {
1204     static int64_t t0;
1205     int64_t        t1;
1206
1207     if (!mig_throttle_on) {
1208         return;
1209     }
1210
1211     if (!t0)  {
1212         t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
1213         return;
1214     }
1215
1216     t1 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
1217
1218     /* If it has been more than 40 ms since the last time the guest
1219      * was throttled then do it again.
1220      */
1221     if (40 < (t1-t0)/1000000) {
1222         mig_throttle_guest_down();
1223         t0 = t1;
1224     }
1225 }