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_page(uint8_t *p)
 154 {
 155     return buffer_find_nonzero_offset(p, TARGET_PAGE_SIZE) ==
 156         TARGET_PAGE_SIZE;
 157 }
 158
 159 /* struct contains XBZRLE cache and a static page
 160    used by the compression */
 161 static struct {
 162     /* buffer used for XBZRLE encoding */
 163     uint8_t *encoded_buf;
 164     /* buffer for storing page content */
 165     uint8_t *current_buf;
 166     /* buffer used for XBZRLE decoding */
 167     uint8_t *decoded_buf;
 168     /* Cache for XBZRLE */
 169     PageCache *cache;
 170 } XBZRLE = {
 171     .encoded_buf = NULL,
 172     .current_buf = NULL,
 173     .decoded_buf = NULL,
 174     .cache = NULL,
 175 };
 176
 177
 178 int64_t xbzrle_cache_resize(int64_t new_size)
 179 {
 180     if (XBZRLE.cache != NULL) {
 181         return cache_resize(XBZRLE.cache, new_size / TARGET_PAGE_SIZE) *
 182             TARGET_PAGE_SIZE;
 183     }
 184     return pow2floor(new_size);
 185 }
 186
 187 /* accounting for migration statistics */
 188 typedef struct AccountingInfo {
 189     uint64_t dup_pages;
 190     uint64_t skipped_pages;
 191     uint64_t norm_pages;
 192     uint64_t iterations;
 193     uint64_t xbzrle_bytes;
 194     uint64_t xbzrle_pages;
 195     uint64_t xbzrle_cache_miss;
 196     uint64_t xbzrle_overflows;
 197 } AccountingInfo;
 198
 199 static AccountingInfo acct_info;
 200
 201 static void acct_clear(void)
 202 {
 203     memset(&acct_info, 0, sizeof(acct_info));
 204 }
 205
 206 uint64_t dup_mig_bytes_transferred(void)
 207 {
 208     return acct_info.dup_pages * TARGET_PAGE_SIZE;
 209 }
 210
 211 uint64_t dup_mig_pages_transferred(void)
 212 {
 213     return acct_info.dup_pages;
 214 }
 215
 216 uint64_t skipped_mig_bytes_transferred(void)
 217 {
 218     return acct_info.skipped_pages * TARGET_PAGE_SIZE;
 219 }
 220
 221 uint64_t skipped_mig_pages_transferred(void)
 222 {
 223     return acct_info.skipped_pages;
 224 }
 225
 226 uint64_t norm_mig_bytes_transferred(void)
 227 {
 228     return acct_info.norm_pages * TARGET_PAGE_SIZE;
 229 }
 230
 231 uint64_t norm_mig_pages_transferred(void)
 232 {
 233     return acct_info.norm_pages;
 234 }
 235
 236 uint64_t xbzrle_mig_bytes_transferred(void)
 237 {
 238     return acct_info.xbzrle_bytes;
 239 }
 240
 241 uint64_t xbzrle_mig_pages_transferred(void)
 242 {
 243     return acct_info.xbzrle_pages;
 244 }
 245
 246 uint64_t xbzrle_mig_pages_cache_miss(void)
 247 {
 248     return acct_info.xbzrle_cache_miss;
 249 }
 250
 251 uint64_t xbzrle_mig_pages_overflow(void)
 252 {
 253     return acct_info.xbzrle_overflows;
 254 }
 255
 256 static size_t save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
 257                              int cont, int flag)
 258 {
 259     size_t size;
 260
 261     qemu_put_be64(f, offset | cont | flag);
 262     size = 8;
 263
 264     if (!cont) {
 265         qemu_put_byte(f, strlen(block->idstr));
 266         qemu_put_buffer(f, (uint8_t *)block->idstr,
 267                         strlen(block->idstr));
 268         size += 1 + strlen(block->idstr);
 269     }
 270     return size;
 271 }
 272
 273 #define ENCODING_FLAG_XBZRLE 0x1
 274
 275 static int save_xbzrle_page(QEMUFile *f, uint8_t *current_data,
 276                             ram_addr_t current_addr, RAMBlock *block,
 277                             ram_addr_t offset, int cont, bool last_stage)
 278 {
 279     int encoded_len = 0, bytes_sent = -1;
 280     uint8_t *prev_cached_page;
 281
 282     if (!cache_is_cached(XBZRLE.cache, current_addr)) {
 283         if (!last_stage) {
 284             cache_insert(XBZRLE.cache, current_addr, current_data);
 285         }
 286         acct_info.xbzrle_cache_miss++;
 287         return -1;
 288     }
 289
 290     prev_cached_page = get_cached_data(XBZRLE.cache, current_addr);
 291
 292     /* save current buffer into memory */
 293     memcpy(XBZRLE.current_buf, current_data, TARGET_PAGE_SIZE);
 294
 295     /* XBZRLE encoding (if there is no overflow) */
 296     encoded_len = xbzrle_encode_buffer(prev_cached_page, XBZRLE.current_buf,
 297                                        TARGET_PAGE_SIZE, XBZRLE.encoded_buf,
 298                                        TARGET_PAGE_SIZE);
 299     if (encoded_len == 0) {
 300         DPRINTF("Skipping unmodified page\n");
 301         return 0;
 302     } else if (encoded_len == -1) {
 303         DPRINTF("Overflow\n");
 304         acct_info.xbzrle_overflows++;
 305         /* update data in the cache */
 306         memcpy(prev_cached_page, current_data, TARGET_PAGE_SIZE);
 307         return -1;
 308     }
 309
 310     /* we need to update the data in the cache, in order to get the same data */
 311     if (!last_stage) {
 312         memcpy(prev_cached_page, XBZRLE.current_buf, TARGET_PAGE_SIZE);
 313     }
 314
 315     /* Send XBZRLE based compressed page */
 316     bytes_sent = save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_XBZRLE);
 317     qemu_put_byte(f, ENCODING_FLAG_XBZRLE);
 318     qemu_put_be16(f, encoded_len);
 319     qemu_put_buffer(f, XBZRLE.encoded_buf, encoded_len);
 320     bytes_sent += encoded_len + 1 + 2;
 321     acct_info.xbzrle_pages++;
 322     acct_info.xbzrle_bytes += bytes_sent;
 323
 324     return bytes_sent;
 325 }
 326
 327
 328 /* This is the last block that we have visited serching for dirty pages
 329  */
 330 static RAMBlock *last_seen_block;
 331 /* This is the last block from where we have sent data */
 332 static RAMBlock *last_sent_block;
 333 static ram_addr_t last_offset;
 334 static unsigned long *migration_bitmap;
 335 static uint64_t migration_dirty_pages;
 336 static uint32_t last_version;
 337 static bool ram_bulk_stage;
 338
 339 static inline
 340 ram_addr_t migration_bitmap_find_and_reset_dirty(MemoryRegion *mr,
 341                                                  ram_addr_t start)
 342 {
 343     unsigned long base = mr->ram_addr >> TARGET_PAGE_BITS;
 344     unsigned long nr = base + (start >> TARGET_PAGE_BITS);
 345     uint64_t mr_size = TARGET_PAGE_ALIGN(memory_region_size(mr));
 346     unsigned long size = base + (mr_size >> TARGET_PAGE_BITS);
 347
 348     unsigned long next;
 349
 350     if (ram_bulk_stage && nr > base) {
 351         next = nr + 1;
 352     } else {
 353         next = find_next_bit(migration_bitmap, size, nr);
 354     }
 355
 356     if (next < size) {
 357         clear_bit(next, migration_bitmap);
 358         migration_dirty_pages--;
 359     }
 360     return (next - base) << TARGET_PAGE_BITS;
 361 }
 362
 363 static inline bool migration_bitmap_set_dirty(MemoryRegion *mr,
 364                                               ram_addr_t offset)
 365 {
 366     bool ret;
 367     int nr = (mr->ram_addr + offset) >> TARGET_PAGE_BITS;
 368
 369     ret = test_and_set_bit(nr, migration_bitmap);
 370
 371     if (!ret) {
 372         migration_dirty_pages++;
 373     }
 374     return ret;
 375 }
 376
 377 /* Needs iothread lock! */
 378
 379 static void migration_bitmap_sync(void)
 380 {
 381     RAMBlock *block;
 382     ram_addr_t addr;
 383     uint64_t num_dirty_pages_init = migration_dirty_pages;
 384     MigrationState *s = migrate_get_current();
 385     static int64_t start_time;
 386     static int64_t bytes_xfer_prev;
 387     static int64_t num_dirty_pages_period;
 388     int64_t end_time;
 389     int64_t bytes_xfer_now;
 390
 391     if (!bytes_xfer_prev) {
 392         bytes_xfer_prev = ram_bytes_transferred();
 393     }
 394
 395     if (!start_time) {
 396         start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
 397     }
 398
 399     trace_migration_bitmap_sync_start();
 400     address_space_sync_dirty_bitmap(&address_space_memory);
 401
 402     QTAILQ_FOREACH(block, &ram_list.blocks, next) {
 403         for (addr = 0; addr < block->length; addr += TARGET_PAGE_SIZE) {
 404             if (memory_region_test_and_clear_dirty(block->mr,
 405                                                    addr, TARGET_PAGE_SIZE,
 406                                                    DIRTY_MEMORY_MIGRATION)) {
 407                 migration_bitmap_set_dirty(block->mr, addr);
 408             }
 409         }
 410     }
 411     trace_migration_bitmap_sync_end(migration_dirty_pages
 412                                     - num_dirty_pages_init);
 413     num_dirty_pages_period += migration_dirty_pages - num_dirty_pages_init;
 414     end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
 415
 416     /* more than 1 second = 1000 millisecons */
 417     if (end_time > start_time + 1000) {
 418         if (migrate_auto_converge()) {
 419             /* The following detection logic can be refined later. For now:
 420                Check to see if the dirtied bytes is 50% more than the approx.
 421                amount of bytes that just got transferred since the last time we
 422                were in this routine. If that happens >N times (for now N==4)
 423                we turn on the throttle down logic */
 424             bytes_xfer_now = ram_bytes_transferred();
 425             if (s->dirty_pages_rate &&
 426                (num_dirty_pages_period * TARGET_PAGE_SIZE >
 427                    (bytes_xfer_now - bytes_xfer_prev)/2) &&
 428                (dirty_rate_high_cnt++ > 4)) {
 429                     trace_migration_throttle();
 430                     mig_throttle_on = true;
 431                     dirty_rate_high_cnt = 0;
 432              }
 433              bytes_xfer_prev = bytes_xfer_now;
 434         } else {
 435              mig_throttle_on = false;
 436         }
 437         s->dirty_pages_rate = num_dirty_pages_period * 1000
 438             / (end_time - start_time);
 439         s->dirty_bytes_rate = s->dirty_pages_rate * TARGET_PAGE_SIZE;
 440         start_time = end_time;
 441         num_dirty_pages_period = 0;
 442     }
 443 }
 444
 445 /*
 446  * ram_save_block: Writes a page of memory to the stream f
 447  *
 448  * Returns:  The number of bytes written.
 449  *           0 means no dirty pages
 450  */
 451
 452 static int ram_save_block(QEMUFile *f, bool last_stage)
 453 {
 454     RAMBlock *block = last_seen_block;
 455     ram_addr_t offset = last_offset;
 456     bool complete_round = false;
 457     int bytes_sent = 0;
 458     MemoryRegion *mr;
 459     ram_addr_t current_addr;
 460
 461     if (!block)
 462         block = QTAILQ_FIRST(&ram_list.blocks);
 463
 464     while (true) {
 465         mr = block->mr;
 466         offset = migration_bitmap_find_and_reset_dirty(mr, offset);
 467         if (complete_round && block == last_seen_block &&
 468             offset >= last_offset) {
 469             break;
 470         }
 471         if (offset >= block->length) {
 472             offset = 0;
 473             block = QTAILQ_NEXT(block, next);
 474             if (!block) {
 475                 block = QTAILQ_FIRST(&ram_list.blocks);
 476                 complete_round = true;
 477                 ram_bulk_stage = false;
 478             }
 479         } else {
 480             int ret;
 481             uint8_t *p;
 482             int cont = (block == last_sent_block) ?
 483                 RAM_SAVE_FLAG_CONTINUE : 0;
 484
 485             p = memory_region_get_ram_ptr(mr) + offset;
 486
 487             /* In doubt sent page as normal */
 488             bytes_sent = -1;
 489             ret = ram_control_save_page(f, block->offset,
 490                                offset, TARGET_PAGE_SIZE, &bytes_sent);
 491
 492             if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
 493                 if (ret != RAM_SAVE_CONTROL_DELAYED) {
 494                     if (bytes_sent > 0) {
 495                         acct_info.norm_pages++;
 496                     } else if (bytes_sent == 0) {
 497                         acct_info.dup_pages++;
 498                     }
 499                 }
 500             } else if (is_zero_page(p)) {
 501                 acct_info.dup_pages++;
 502                 bytes_sent = save_block_hdr(f, block, offset, cont,
 503                                             RAM_SAVE_FLAG_COMPRESS);
 504                 qemu_put_byte(f, 0);
 505                 bytes_sent++;
 506             } else if (!ram_bulk_stage && migrate_use_xbzrle()) {
 507                 current_addr = block->offset + offset;
 508                 bytes_sent = save_xbzrle_page(f, p, current_addr, block,
 509                                               offset, cont, last_stage);
 510                 if (!last_stage) {
 511                     p = get_cached_data(XBZRLE.cache, current_addr);
 512                 }
 513             }
 514
 515             /* XBZRLE overflow or normal page */
 516             if (bytes_sent == -1) {
 517                 bytes_sent = save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
 518                 qemu_put_buffer_async(f, p, TARGET_PAGE_SIZE);
 519                 bytes_sent += TARGET_PAGE_SIZE;
 520                 acct_info.norm_pages++;
 521             }
 522
 523             /* if page is unmodified, continue to the next */
 524             if (bytes_sent > 0) {
 525                 last_sent_block = block;
 526                 break;
 527             }
 528         }
 529     }
 530     last_seen_block = block;
 531     last_offset = offset;
 532
 533     return bytes_sent;
 534 }
 535
 536 static uint64_t bytes_transferred;
 537
 538 void acct_update_position(QEMUFile *f, size_t size, bool zero)
 539 {
 540     uint64_t pages = size / TARGET_PAGE_SIZE;
 541     if (zero) {
 542         acct_info.dup_pages += pages;
 543     } else {
 544         acct_info.norm_pages += pages;
 545         bytes_transferred += size;
 546         qemu_update_position(f, size);
 547     }
 548 }
 549
 550 static ram_addr_t ram_save_remaining(void)
 551 {
 552     return migration_dirty_pages;
 553 }
 554
 555 uint64_t ram_bytes_remaining(void)
 556 {
 557     return ram_save_remaining() * TARGET_PAGE_SIZE;
 558 }
 559
 560 uint64_t ram_bytes_transferred(void)
 561 {
 562     return bytes_transferred;
 563 }
 564
 565 uint64_t ram_bytes_total(void)
 566 {
 567     RAMBlock *block;
 568     uint64_t total = 0;
 569
 570     QTAILQ_FOREACH(block, &ram_list.blocks, next)
 571         total += block->length;
 572
 573     return total;
 574 }
 575
 576 static void migration_end(void)
 577 {
 578     if (migration_bitmap) {
 579         memory_global_dirty_log_stop();
 580         g_free(migration_bitmap);
 581         migration_bitmap = NULL;
 582     }
 583
 584     if (XBZRLE.cache) {
 585         cache_fini(XBZRLE.cache);
 586         g_free(XBZRLE.cache);
 587         g_free(XBZRLE.encoded_buf);
 588         g_free(XBZRLE.current_buf);
 589         g_free(XBZRLE.decoded_buf);
 590         XBZRLE.cache = NULL;
 591     }
 592 }
 593
 594 static void ram_migration_cancel(void *opaque)
 595 {
 596     migration_end();
 597 }
 598
 599 static void reset_ram_globals(void)
 600 {
 601     last_seen_block = NULL;
 602     last_sent_block = NULL;
 603     last_offset = 0;
 604     last_version = ram_list.version;
 605     ram_bulk_stage = true;
 606 }
 607
 608 #define MAX_WAIT 50 /* ms, half buffered_file limit */
 609
 610 static int ram_save_setup(QEMUFile *f, void *opaque)
 611 {
 612     RAMBlock *block;
 613     int64_t ram_pages = last_ram_offset() >> TARGET_PAGE_BITS;
 614
 615     migration_bitmap = bitmap_new(ram_pages);
 616     bitmap_set(migration_bitmap, 0, ram_pages);
 617     migration_dirty_pages = ram_pages;
 618     mig_throttle_on = false;
 619     dirty_rate_high_cnt = 0;
 620
 621     if (migrate_use_xbzrle()) {
 622         XBZRLE.cache = cache_init(migrate_xbzrle_cache_size() /
 623                                   TARGET_PAGE_SIZE,
 624                                   TARGET_PAGE_SIZE);
 625         if (!XBZRLE.cache) {
 626             DPRINTF("Error creating cache\n");
 627             return -1;
 628         }
 629         XBZRLE.encoded_buf = g_malloc0(TARGET_PAGE_SIZE);
 630         XBZRLE.current_buf = g_malloc(TARGET_PAGE_SIZE);
 631         acct_clear();
 632     }
 633
 634     qemu_mutex_lock_iothread();
 635     qemu_mutex_lock_ramlist();
 636     bytes_transferred = 0;
 637     reset_ram_globals();
 638
 639     memory_global_dirty_log_start();
 640     migration_bitmap_sync();
 641     qemu_mutex_unlock_iothread();
 642
 643     qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
 644
 645     QTAILQ_FOREACH(block, &ram_list.blocks, next) {
 646         qemu_put_byte(f, strlen(block->idstr));
 647         qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr));
 648         qemu_put_be64(f, block->length);
 649     }
 650
 651     qemu_mutex_unlock_ramlist();
 652
 653     ram_control_before_iterate(f, RAM_CONTROL_SETUP);
 654     ram_control_after_iterate(f, RAM_CONTROL_SETUP);
 655
 656     qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
 657
 658     return 0;
 659 }
 660
 661 static int ram_save_iterate(QEMUFile *f, void *opaque)
 662 {
 663     int ret;
 664     int i;
 665     int64_t t0;
 666     int total_sent = 0;
 667
 668     qemu_mutex_lock_ramlist();
 669
 670     if (ram_list.version != last_version) {
 671         reset_ram_globals();
 672     }
 673
 674     ram_control_before_iterate(f, RAM_CONTROL_ROUND);
 675
 676     t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
 677     i = 0;
 678     while ((ret = qemu_file_rate_limit(f)) == 0) {
 679         int bytes_sent;
 680
 681         bytes_sent = ram_save_block(f, false);
 682         /* no more blocks to sent */
 683         if (bytes_sent == 0) {
 684             break;
 685         }
 686         total_sent += bytes_sent;
 687         acct_info.iterations++;
 688         check_guest_throttling();
 689         /* we want to check in the 1st loop, just in case it was the 1st time
 690            and we had to sync the dirty bitmap.
 691            qemu_get_clock_ns() is a bit expensive, so we only check each some
 692            iterations
 693         */
 694         if ((i & 63) == 0) {
 695             uint64_t t1 = (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - t0) / 1000000;
 696             if (t1 > MAX_WAIT) {
 697                 DPRINTF("big wait: %" PRIu64 " milliseconds, %d iterations\n",
 698                         t1, i);
 699                 break;
 700             }
 701         }
 702         i++;
 703     }
 704
 705     qemu_mutex_unlock_ramlist();
 706
 707     /*
 708      * Must occur before EOS (or any QEMUFile operation)
 709      * because of RDMA protocol.
 710      */
 711     ram_control_after_iterate(f, RAM_CONTROL_ROUND);
 712
 713     if (ret < 0) {
 714         bytes_transferred += total_sent;
 715         return ret;
 716     }
 717
 718     qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
 719     total_sent += 8;
 720     bytes_transferred += total_sent;
 721
 722     return total_sent;
 723 }
 724
 725 static int ram_save_complete(QEMUFile *f, void *opaque)
 726 {
 727     qemu_mutex_lock_ramlist();
 728     migration_bitmap_sync();
 729
 730     ram_control_before_iterate(f, RAM_CONTROL_FINISH);
 731
 732     /* try transferring iterative blocks of memory */
 733
 734     /* flush all remaining blocks regardless of rate limiting */
 735     while (true) {
 736         int bytes_sent;
 737
 738         bytes_sent = ram_save_block(f, true);
 739         /* no more blocks to sent */
 740         if (bytes_sent == 0) {
 741             break;
 742         }
 743         bytes_transferred += bytes_sent;
 744     }
 745
 746     ram_control_after_iterate(f, RAM_CONTROL_FINISH);
 747     migration_end();
 748
 749     qemu_mutex_unlock_ramlist();
 750     qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
 751
 752     return 0;
 753 }
 754
 755 static uint64_t ram_save_pending(QEMUFile *f, void *opaque, uint64_t max_size)
 756 {
 757     uint64_t remaining_size;
 758
 759     remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE;
 760
 761     if (remaining_size < max_size) {
 762         qemu_mutex_lock_iothread();
 763         migration_bitmap_sync();
 764         qemu_mutex_unlock_iothread();
 765         remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE;
 766     }
 767     return remaining_size;
 768 }
 769
 770 static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host)
 771 {
 772     int ret, rc = 0;
 773     unsigned int xh_len;
 774     int xh_flags;
 775
 776     if (!XBZRLE.decoded_buf) {
 777         XBZRLE.decoded_buf = g_malloc(TARGET_PAGE_SIZE);
 778     }
 779
 780     /* extract RLE header */
 781     xh_flags = qemu_get_byte(f);
 782     xh_len = qemu_get_be16(f);
 783
 784     if (xh_flags != ENCODING_FLAG_XBZRLE) {
 785         fprintf(stderr, "Failed to load XBZRLE page - wrong compression!\n");
 786         return -1;
 787     }
 788
 789     if (xh_len > TARGET_PAGE_SIZE) {
 790         fprintf(stderr, "Failed to load XBZRLE page - len overflow!\n");
 791         return -1;
 792     }
 793     /* load data and decode */
 794     qemu_get_buffer(f, XBZRLE.decoded_buf, xh_len);
 795
 796     /* decode RLE */
 797     ret = xbzrle_decode_buffer(XBZRLE.decoded_buf, xh_len, host,
 798                                TARGET_PAGE_SIZE);
 799     if (ret == -1) {
 800         fprintf(stderr, "Failed to load XBZRLE page - decode error!\n");
 801         rc = -1;
 802     } else  if (ret > TARGET_PAGE_SIZE) {
 803         fprintf(stderr, "Failed to load XBZRLE page - size %d exceeds %d!\n",
 804                 ret, TARGET_PAGE_SIZE);
 805         abort();
 806     }
 807
 808     return rc;
 809 }
 810
 811 static inline void *host_from_stream_offset(QEMUFile *f,
 812                                             ram_addr_t offset,
 813                                             int flags)
 814 {
 815     static RAMBlock *block = NULL;
 816     char id[256];
 817     uint8_t len;
 818
 819     if (flags & RAM_SAVE_FLAG_CONTINUE) {
 820         if (!block) {
 821             fprintf(stderr, "Ack, bad migration stream!\n");
 822             return NULL;
 823         }
 824
 825         return memory_region_get_ram_ptr(block->mr) + offset;
 826     }
 827
 828     len = qemu_get_byte(f);
 829     qemu_get_buffer(f, (uint8_t *)id, len);
 830     id[len] = 0;
 831
 832     QTAILQ_FOREACH(block, &ram_list.blocks, next) {
 833         if (!strncmp(id, block->idstr, sizeof(id)))
 834             return memory_region_get_ram_ptr(block->mr) + offset;
 835     }
 836
 837     fprintf(stderr, "Can't find block %s!\n", id);
 838     return NULL;
 839 }
 840
 841 /*
 842  * If a page (or a whole RDMA chunk) has been
 843  * determined to be zero, then zap it.
 844  */
 845 void ram_handle_compressed(void *host, uint8_t ch, uint64_t size)
 846 {
 847     if (ch != 0 || !is_zero_page(host)) {
 848         memset(host, ch, size);
 849 #ifndef _WIN32
 850         if (ch == 0 &&
 851             (!kvm_enabled() || kvm_has_sync_mmu()) &&
 852             getpagesize() <= TARGET_PAGE_SIZE) {
 853             qemu_madvise(host, TARGET_PAGE_SIZE, QEMU_MADV_DONTNEED);
 854         }
 855 #endif
 856     }
 857 }
 858
 859 static int ram_load(QEMUFile *f, void *opaque, int version_id)
 860 {
 861     ram_addr_t addr;
 862     int flags, ret = 0;
 863     int error;
 864     static uint64_t seq_iter;
 865
 866     seq_iter++;
 867
 868     if (version_id < 4 || version_id > 4) {
 869         return -EINVAL;
 870     }
 871
 872     do {
 873         addr = qemu_get_be64(f);
 874
 875         flags = addr & ~TARGET_PAGE_MASK;
 876         addr &= TARGET_PAGE_MASK;
 877
 878         if (flags & RAM_SAVE_FLAG_MEM_SIZE) {
 879             if (version_id == 4) {
 880                 /* Synchronize RAM block list */
 881                 char id[256];
 882                 ram_addr_t length;
 883                 ram_addr_t total_ram_bytes = addr;
 884
 885                 while (total_ram_bytes) {
 886                     RAMBlock *block;
 887                     uint8_t len;
 888
 889                     len = qemu_get_byte(f);
 890                     qemu_get_buffer(f, (uint8_t *)id, len);
 891                     id[len] = 0;
 892                     length = qemu_get_be64(f);
 893
 894                     QTAILQ_FOREACH(block, &ram_list.blocks, next) {
 895                         if (!strncmp(id, block->idstr, sizeof(id))) {
 896                             if (block->length != length) {
 897                                 fprintf(stderr,
 898                                         "Length mismatch: %s: " RAM_ADDR_FMT
 899                                         " in != " RAM_ADDR_FMT "\n", id, length,
 900                                         block->length);
 901                                 ret =  -EINVAL;
 902                                 goto done;
 903                             }
 904                             break;
 905                         }
 906                     }
 907
 908                     if (!block) {
 909                         fprintf(stderr, "Unknown ramblock \"%s\", cannot "
 910                                 "accept migration\n", id);
 911                         ret = -EINVAL;
 912                         goto done;
 913                     }
 914
 915                     total_ram_bytes -= length;
 916                 }
 917             }
 918         }
 919
 920         if (flags & RAM_SAVE_FLAG_COMPRESS) {
 921             void *host;
 922             uint8_t ch;
 923
 924             host = host_from_stream_offset(f, addr, flags);
 925             if (!host) {
 926                 return -EINVAL;
 927             }
 928
 929             ch = qemu_get_byte(f);
 930             ram_handle_compressed(host, ch, TARGET_PAGE_SIZE);
 931         } else if (flags & RAM_SAVE_FLAG_PAGE) {
 932             void *host;
 933
 934             host = host_from_stream_offset(f, addr, flags);
 935             if (!host) {
 936                 return -EINVAL;
 937             }
 938
 939             qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
 940         } else if (flags & RAM_SAVE_FLAG_XBZRLE) {
 941             void *host = host_from_stream_offset(f, addr, flags);
 942             if (!host) {
 943                 return -EINVAL;
 944             }
 945
 946             if (load_xbzrle(f, addr, host) < 0) {
 947                 ret = -EINVAL;
 948                 goto done;
 949             }
 950         } else if (flags & RAM_SAVE_FLAG_HOOK) {
 951             ram_control_load_hook(f, flags);
 952         }
 953         error = qemu_file_get_error(f);
 954         if (error) {
 955             ret = error;
 956             goto done;
 957         }
 958     } while (!(flags & RAM_SAVE_FLAG_EOS));
 959
 960 done:
 961     DPRINTF("Completed load of VM with exit code %d seq iteration "
 962             "%" PRIu64 "\n", ret, seq_iter);
 963     return ret;
 964 }
 965
 966 SaveVMHandlers savevm_ram_handlers = {
 967     .save_live_setup = ram_save_setup,
 968     .save_live_iterate = ram_save_iterate,
 969     .save_live_complete = ram_save_complete,
 970     .save_live_pending = ram_save_pending,
 971     .load_state = ram_load,
 972     .cancel = ram_migration_cancel,
 973 };
 974
 975 struct soundhw {
 976     const char *name;
 977     const char *descr;
 978     int enabled;
 979     int isa;
 980     union {
 981         int (*init_isa) (ISABus *bus);
 982         int (*init_pci) (PCIBus *bus);
 983     } init;
 984 };
 985
 986 static struct soundhw soundhw[9];
 987 static int soundhw_count;
 988
 989 void isa_register_soundhw(const char *name, const char *descr,
 990                           int (*init_isa)(ISABus *bus))
 991 {
 992     assert(soundhw_count < ARRAY_SIZE(soundhw) - 1);
 993     soundhw[soundhw_count].name = name;
 994     soundhw[soundhw_count].descr = descr;
 995     soundhw[soundhw_count].isa = 1;
 996     soundhw[soundhw_count].init.init_isa = init_isa;
 997     soundhw_count++;
 998 }
 999
1000 void pci_register_soundhw(const char *name, const char *descr,
1001                           int (*init_pci)(PCIBus *bus))
1002 {
1003     assert(soundhw_count < ARRAY_SIZE(soundhw) - 1);
1004     soundhw[soundhw_count].name = name;
1005     soundhw[soundhw_count].descr = descr;
1006     soundhw[soundhw_count].isa = 0;
1007     soundhw[soundhw_count].init.init_pci = init_pci;
1008     soundhw_count++;
1009 }
1010
1011 void select_soundhw(const char *optarg)
1012 {
1013     struct soundhw *c;
1014
1015     if (is_help_option(optarg)) {
1016     show_valid_cards:
1017
1018         if (soundhw_count) {
1019              printf("Valid sound card names (comma separated):\n");
1020              for (c = soundhw; c->name; ++c) {
1021                  printf ("%-11s %s\n", c->name, c->descr);
1022              }
1023              printf("\n-soundhw all will enable all of the above\n");
1024         } else {
1025              printf("Machine has no user-selectable audio hardware "
1026                     "(it may or may not have always-present audio hardware).\n");
1027         }
1028         exit(!is_help_option(optarg));
1029     }
1030     else {
1031         size_t l;
1032         const char *p;
1033         char *e;
1034         int bad_card = 0;
1035
1036         if (!strcmp(optarg, "all")) {
1037             for (c = soundhw; c->name; ++c) {
1038                 c->enabled = 1;
1039             }
1040             return;
1041         }
1042
1043         p = optarg;
1044         while (*p) {
1045             e = strchr(p, ',');
1046             l = !e ? strlen(p) : (size_t) (e - p);
1047
1048             for (c = soundhw; c->name; ++c) {
1049                 if (!strncmp(c->name, p, l) && !c->name[l]) {
1050                     c->enabled = 1;
1051                     break;
1052                 }
1053             }
1054
1055             if (!c->name) {
1056                 if (l > 80) {
1057                     fprintf(stderr,
1058                             "Unknown sound card name (too big to show)\n");
1059                 }
1060                 else {
1061                     fprintf(stderr, "Unknown sound card name `%.*s'\n",
1062                             (int) l, p);
1063                 }
1064                 bad_card = 1;
1065             }
1066             p += l + (e != NULL);
1067         }
1068
1069         if (bad_card) {
1070             goto show_valid_cards;
1071         }
1072     }
1073 }
1074
1075 void audio_init(void)
1076 {
1077     struct soundhw *c;
1078     ISABus *isa_bus = (ISABus *) object_resolve_path_type("", TYPE_ISA_BUS, NULL);
1079     PCIBus *pci_bus = (PCIBus *) object_resolve_path_type("", TYPE_PCI_BUS, NULL);
1080
1081     for (c = soundhw; c->name; ++c) {
1082         if (c->enabled) {
1083             if (c->isa) {
1084                 if (!isa_bus) {
1085                     fprintf(stderr, "ISA bus not available for %s\n", c->name);
1086                     exit(1);
1087                 }
1088                 c->init.init_isa(isa_bus);
1089             } else {
1090                 if (!pci_bus) {
1091                     fprintf(stderr, "PCI bus not available for %s\n", c->name);
1092                     exit(1);
1093                 }
1094                 c->init.init_pci(pci_bus);
1095             }
1096         }
1097     }
1098 }
1099
1100 int qemu_uuid_parse(const char *str, uint8_t *uuid)
1101 {
1102     int ret;
1103
1104     if (strlen(str) != 36) {
1105         return -1;
1106     }
1107
1108     ret = sscanf(str, UUID_FMT, &uuid[0], &uuid[1], &uuid[2], &uuid[3],
1109                  &uuid[4], &uuid[5], &uuid[6], &uuid[7], &uuid[8], &uuid[9],
1110                  &uuid[10], &uuid[11], &uuid[12], &uuid[13], &uuid[14],
1111                  &uuid[15]);
1112
1113     if (ret != 16) {
1114         return -1;
1115     }
1116     return 0;
1117 }
1118
1119 void do_acpitable_option(const QemuOpts *opts)
1120 {
1121 #ifdef TARGET_I386
1122     Error *err = NULL;
1123
1124     acpi_table_add(opts, &err);
1125     if (err) {
1126         error_report("Wrong acpi table provided: %s",
1127                      error_get_pretty(err));
1128         error_free(err);
1129         exit(1);
1130     }
1131 #endif
1132 }
1133
1134 void do_smbios_option(QemuOpts *opts)
1135 {
1136 #ifdef TARGET_I386
1137     smbios_entry_add(opts);
1138 #endif
1139 }
1140
1141 void cpudef_init(void)
1142 {
1143 #if defined(cpudef_setup)
1144     cpudef_setup(); /* parse cpu definitions in target config file */
1145 #endif
1146 }
1147
1148 int tcg_available(void)
1149 {
1150     return 1;
1151 }
1152
1153 int kvm_available(void)
1154 {
1155 #ifdef CONFIG_KVM
1156     return 1;
1157 #else
1158     return 0;
1159 #endif
1160 }
1161
1162 int xen_available(void)
1163 {
1164 #ifdef CONFIG_XEN
1165     return 1;
1166 #else
1167     return 0;
1168 #endif
1169 }
1170
1171
1172 TargetInfo *qmp_query_target(Error **errp)
1173 {
1174     TargetInfo *info = g_malloc0(sizeof(*info));
1175
1176     info->arch = g_strdup(TARGET_NAME);
1177
1178     return info;
1179 }
1180
1181 /* Stub function that's gets run on the vcpu when its brought out of the
1182    VM to run inside qemu via async_run_on_cpu()*/
1183 static void mig_sleep_cpu(void *opq)
1184 {
1185     qemu_mutex_unlock_iothread();
1186     g_usleep(30*1000);
1187     qemu_mutex_lock_iothread();
1188 }
1189
1190 /* To reduce the dirty rate explicitly disallow the VCPUs from spending
1191    much time in the VM. The migration thread will try to catchup.
1192    Workload will experience a performance drop.
1193 */
1194 static void mig_throttle_guest_down(void)
1195 {
1196     CPUState *cpu;
1197
1198     qemu_mutex_lock_iothread();
1199     CPU_FOREACH(cpu) {
1200         async_run_on_cpu(cpu, mig_sleep_cpu, NULL);
1201     }
1202     qemu_mutex_unlock_iothread();
1203 }
1204
1205 static void check_guest_throttling(void)
1206 {
1207     static int64_t t0;
1208     int64_t        t1;
1209
1210     if (!mig_throttle_on) {
1211         return;
1212     }
1213
1214     if (!t0)  {
1215         t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
1216         return;
1217     }
1218
1219     t1 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
1220
1221     /* If it has been more than 40 ms since the last time the guest
1222      * was throttled then do it again.
1223      */
1224     if (40 < (t1-t0)/1000000) {
1225         mig_throttle_guest_down();
1226         t0 = t1;
1227     }
1228 }