memory.c

   1 /*
   2  * Physical memory management
   3  *
   4  * Copyright 2011 Red Hat, Inc. and/or its affiliates
   5  *
   6  * Authors:
   7  *  Avi Kivity <[email protected]>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Contributions after 2012-01-13 are licensed under the terms of the
  13  * GNU GPL, version 2 or (at your option) any later version.
  14  */
  15
  16 #include "exec/memory.h"
  17 #include "exec/address-spaces.h"
  18 #include "exec/ioport.h"
  19 #include "qapi/visitor.h"
  20 #include "qemu/bitops.h"
  21 #include "qom/object.h"
  22 #include "trace.h"
  23 #include <assert.h>
  24
  25 #include "exec/memory-internal.h"
  26 #include "exec/ram_addr.h"
  27 #include "sysemu/sysemu.h"
  28
  29 //#define DEBUG_UNASSIGNED
  30
  31 #define RAM_ADDR_INVALID (~(ram_addr_t)0)
  32
  33 static unsigned memory_region_transaction_depth;
  34 static bool memory_region_update_pending;
  35 static bool ioeventfd_update_pending;
  36 static bool global_dirty_log = false;
  37
  38 static QTAILQ_HEAD(memory_listeners, MemoryListener) memory_listeners
  39     = QTAILQ_HEAD_INITIALIZER(memory_listeners);
  40
  41 static QTAILQ_HEAD(, AddressSpace) address_spaces
  42     = QTAILQ_HEAD_INITIALIZER(address_spaces);
  43
  44 typedef struct AddrRange AddrRange;
  45
  46 /*
  47  * Note that signed integers are needed for negative offsetting in aliases
  48  * (large MemoryRegion::alias_offset).
  49  */
  50 struct AddrRange {
  51     Int128 start;
  52     Int128 size;
  53 };
  54
  55 static AddrRange addrrange_make(Int128 start, Int128 size)
  56 {
  57     return (AddrRange) { start, size };
  58 }
  59
  60 static bool addrrange_equal(AddrRange r1, AddrRange r2)
  61 {
  62     return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
  63 }
  64
  65 static Int128 addrrange_end(AddrRange r)
  66 {
  67     return int128_add(r.start, r.size);
  68 }
  69
  70 static AddrRange addrrange_shift(AddrRange range, Int128 delta)
  71 {
  72     int128_addto(&range.start, delta);
  73     return range;
  74 }
  75
  76 static bool addrrange_contains(AddrRange range, Int128 addr)
  77 {
  78     return int128_ge(addr, range.start)
  79         && int128_lt(addr, addrrange_end(range));
  80 }
  81
  82 static bool addrrange_intersects(AddrRange r1, AddrRange r2)
  83 {
  84     return addrrange_contains(r1, r2.start)
  85         || addrrange_contains(r2, r1.start);
  86 }
  87
  88 static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
  89 {
  90     Int128 start = int128_max(r1.start, r2.start);
  91     Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
  92     return addrrange_make(start, int128_sub(end, start));
  93 }
  94
  95 enum ListenerDirection { Forward, Reverse };
  96
  97 static bool memory_listener_match(MemoryListener *listener,
  98                                   MemoryRegionSection *section)
  99 {
 100     return !listener->address_space_filter
 101         || listener->address_space_filter == section->address_space;
 102 }
 103
 104 #define MEMORY_LISTENER_CALL_GLOBAL(_callback, _direction, _args...)    \
 105     do {                                                                \
 106         MemoryListener *_listener;                                      \
 107                                                                         \
 108         switch (_direction) {                                           \
 109         case Forward:                                                   \
 110             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 111                 if (_listener->_callback) {                             \
 112                     _listener->_callback(_listener, ##_args);           \
 113                 }                                                       \
 114             }                                                           \
 115             break;                                                      \
 116         case Reverse:                                                   \
 117             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 118                                    memory_listeners, link) {            \
 119                 if (_listener->_callback) {                             \
 120                     _listener->_callback(_listener, ##_args);           \
 121                 }                                                       \
 122             }                                                           \
 123             break;                                                      \
 124         default:                                                        \
 125             abort();                                                    \
 126         }                                                               \
 127     } while (0)
 128
 129 #define MEMORY_LISTENER_CALL(_callback, _direction, _section, _args...) \
 130     do {                                                                \
 131         MemoryListener *_listener;                                      \
 132                                                                         \
 133         switch (_direction) {                                           \
 134         case Forward:                                                   \
 135             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 136                 if (_listener->_callback                                \
 137                     && memory_listener_match(_listener, _section)) {    \
 138                     _listener->_callback(_listener, _section, ##_args); \
 139                 }                                                       \
 140             }                                                           \
 141             break;                                                      \
 142         case Reverse:                                                   \
 143             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 144                                    memory_listeners, link) {            \
 145                 if (_listener->_callback                                \
 146                     && memory_listener_match(_listener, _section)) {    \
 147                     _listener->_callback(_listener, _section, ##_args); \
 148                 }                                                       \
 149             }                                                           \
 150             break;                                                      \
 151         default:                                                        \
 152             abort();                                                    \
 153         }                                                               \
 154     } while (0)
 155
 156 /* No need to ref/unref .mr, the FlatRange keeps it alive.  */
 157 #define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback, _args...)  \
 158     MEMORY_LISTENER_CALL(callback, dir, (&(MemoryRegionSection) {       \
 159         .mr = (fr)->mr,                                                 \
 160         .address_space = (as),                                          \
 161         .offset_within_region = (fr)->offset_in_region,                 \
 162         .size = (fr)->addr.size,                                        \
 163         .offset_within_address_space = int128_get64((fr)->addr.start),  \
 164         .readonly = (fr)->readonly,                                     \
 165               }), ##_args)
 166
 167 struct CoalescedMemoryRange {
 168     AddrRange addr;
 169     QTAILQ_ENTRY(CoalescedMemoryRange) link;
 170 };
 171
 172 struct MemoryRegionIoeventfd {
 173     AddrRange addr;
 174     bool match_data;
 175     uint64_t data;
 176     EventNotifier *e;
 177 };
 178
 179 static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
 180                                            MemoryRegionIoeventfd b)
 181 {
 182     if (int128_lt(a.addr.start, b.addr.start)) {
 183         return true;
 184     } else if (int128_gt(a.addr.start, b.addr.start)) {
 185         return false;
 186     } else if (int128_lt(a.addr.size, b.addr.size)) {
 187         return true;
 188     } else if (int128_gt(a.addr.size, b.addr.size)) {
 189         return false;
 190     } else if (a.match_data < b.match_data) {
 191         return true;
 192     } else  if (a.match_data > b.match_data) {
 193         return false;
 194     } else if (a.match_data) {
 195         if (a.data < b.data) {
 196             return true;
 197         } else if (a.data > b.data) {
 198             return false;
 199         }
 200     }
 201     if (a.e < b.e) {
 202         return true;
 203     } else if (a.e > b.e) {
 204         return false;
 205     }
 206     return false;
 207 }
 208
 209 static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
 210                                           MemoryRegionIoeventfd b)
 211 {
 212     return !memory_region_ioeventfd_before(a, b)
 213         && !memory_region_ioeventfd_before(b, a);
 214 }
 215
 216 typedef struct FlatRange FlatRange;
 217 typedef struct FlatView FlatView;
 218
 219 /* Range of memory in the global map.  Addresses are absolute. */
 220 struct FlatRange {
 221     MemoryRegion *mr;
 222     hwaddr offset_in_region;
 223     AddrRange addr;
 224     uint8_t dirty_log_mask;
 225     bool romd_mode;
 226     bool readonly;
 227 };
 228
 229 /* Flattened global view of current active memory hierarchy.  Kept in sorted
 230  * order.
 231  */
 232 struct FlatView {
 233     struct rcu_head rcu;
 234     unsigned ref;
 235     FlatRange *ranges;
 236     unsigned nr;
 237     unsigned nr_allocated;
 238 };
 239
 240 typedef struct AddressSpaceOps AddressSpaceOps;
 241
 242 #define FOR_EACH_FLAT_RANGE(var, view)          \
 243     for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
 244
 245 static bool flatrange_equal(FlatRange *a, FlatRange *b)
 246 {
 247     return a->mr == b->mr
 248         && addrrange_equal(a->addr, b->addr)
 249         && a->offset_in_region == b->offset_in_region
 250         && a->romd_mode == b->romd_mode
 251         && a->readonly == b->readonly;
 252 }
 253
 254 static void flatview_init(FlatView *view)
 255 {
 256     view->ref = 1;
 257     view->ranges = NULL;
 258     view->nr = 0;
 259     view->nr_allocated = 0;
 260 }
 261
 262 /* Insert a range into a given position.  Caller is responsible for maintaining
 263  * sorting order.
 264  */
 265 static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range)
 266 {
 267     if (view->nr == view->nr_allocated) {
 268         view->nr_allocated = MAX(2 * view->nr, 10);
 269         view->ranges = g_realloc(view->ranges,
 270                                     view->nr_allocated * sizeof(*view->ranges));
 271     }
 272     memmove(view->ranges + pos + 1, view->ranges + pos,
 273             (view->nr - pos) * sizeof(FlatRange));
 274     view->ranges[pos] = *range;
 275     memory_region_ref(range->mr);
 276     ++view->nr;
 277 }
 278
 279 static void flatview_destroy(FlatView *view)
 280 {
 281     int i;
 282
 283     for (i = 0; i < view->nr; i++) {
 284         memory_region_unref(view->ranges[i].mr);
 285     }
 286     g_free(view->ranges);
 287     g_free(view);
 288 }
 289
 290 static void flatview_ref(FlatView *view)
 291 {
 292     atomic_inc(&view->ref);
 293 }
 294
 295 static void flatview_unref(FlatView *view)
 296 {
 297     if (atomic_fetch_dec(&view->ref) == 1) {
 298         flatview_destroy(view);
 299     }
 300 }
 301
 302 static bool can_merge(FlatRange *r1, FlatRange *r2)
 303 {
 304     return int128_eq(addrrange_end(r1->addr), r2->addr.start)
 305         && r1->mr == r2->mr
 306         && int128_eq(int128_add(int128_make64(r1->offset_in_region),
 307                                 r1->addr.size),
 308                      int128_make64(r2->offset_in_region))
 309         && r1->dirty_log_mask == r2->dirty_log_mask
 310         && r1->romd_mode == r2->romd_mode
 311         && r1->readonly == r2->readonly;
 312 }
 313
 314 /* Attempt to simplify a view by merging adjacent ranges */
 315 static void flatview_simplify(FlatView *view)
 316 {
 317     unsigned i, j;
 318
 319     i = 0;
 320     while (i < view->nr) {
 321         j = i + 1;
 322         while (j < view->nr
 323                && can_merge(&view->ranges[j-1], &view->ranges[j])) {
 324             int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
 325             ++j;
 326         }
 327         ++i;
 328         memmove(&view->ranges[i], &view->ranges[j],
 329                 (view->nr - j) * sizeof(view->ranges[j]));
 330         view->nr -= j - i;
 331     }
 332 }
 333
 334 static bool memory_region_big_endian(MemoryRegion *mr)
 335 {
 336 #ifdef TARGET_WORDS_BIGENDIAN
 337     return mr->ops->endianness != DEVICE_LITTLE_ENDIAN;
 338 #else
 339     return mr->ops->endianness == DEVICE_BIG_ENDIAN;
 340 #endif
 341 }
 342
 343 static bool memory_region_wrong_endianness(MemoryRegion *mr)
 344 {
 345 #ifdef TARGET_WORDS_BIGENDIAN
 346     return mr->ops->endianness == DEVICE_LITTLE_ENDIAN;
 347 #else
 348     return mr->ops->endianness == DEVICE_BIG_ENDIAN;
 349 #endif
 350 }
 351
 352 static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size)
 353 {
 354     if (memory_region_wrong_endianness(mr)) {
 355         switch (size) {
 356         case 1:
 357             break;
 358         case 2:
 359             *data = bswap16(*data);
 360             break;
 361         case 4:
 362             *data = bswap32(*data);
 363             break;
 364         case 8:
 365             *data = bswap64(*data);
 366             break;
 367         default:
 368             abort();
 369         }
 370     }
 371 }
 372
 373 static MemTxResult memory_region_oldmmio_read_accessor(MemoryRegion *mr,
 374                                                        hwaddr addr,
 375                                                        uint64_t *value,
 376                                                        unsigned size,
 377                                                        unsigned shift,
 378                                                        uint64_t mask,
 379                                                        MemTxAttrs attrs)
 380 {
 381     uint64_t tmp;
 382
 383     tmp = mr->ops->old_mmio.read[ctz32(size)](mr->opaque, addr);
 384     trace_memory_region_ops_read(mr, addr, tmp, size);
 385     *value |= (tmp & mask) << shift;
 386     return MEMTX_OK;
 387 }
 388
 389 static MemTxResult  memory_region_read_accessor(MemoryRegion *mr,
 390                                                 hwaddr addr,
 391                                                 uint64_t *value,
 392                                                 unsigned size,
 393                                                 unsigned shift,
 394                                                 uint64_t mask,
 395                                                 MemTxAttrs attrs)
 396 {
 397     uint64_t tmp;
 398
 399     tmp = mr->ops->read(mr->opaque, addr, size);
 400     trace_memory_region_ops_read(mr, addr, tmp, size);
 401     *value |= (tmp & mask) << shift;
 402     return MEMTX_OK;
 403 }
 404
 405 static MemTxResult memory_region_read_with_attrs_accessor(MemoryRegion *mr,
 406                                                           hwaddr addr,
 407                                                           uint64_t *value,
 408                                                           unsigned size,
 409                                                           unsigned shift,
 410                                                           uint64_t mask,
 411                                                           MemTxAttrs attrs)
 412 {
 413     uint64_t tmp = 0;
 414     MemTxResult r;
 415
 416     r = mr->ops->read_with_attrs(mr->opaque, addr, &tmp, size, attrs);
 417     trace_memory_region_ops_read(mr, addr, tmp, size);
 418     *value |= (tmp & mask) << shift;
 419     return r;
 420 }
 421
 422 static MemTxResult memory_region_oldmmio_write_accessor(MemoryRegion *mr,
 423                                                         hwaddr addr,
 424                                                         uint64_t *value,
 425                                                         unsigned size,
 426                                                         unsigned shift,
 427                                                         uint64_t mask,
 428                                                         MemTxAttrs attrs)
 429 {
 430     uint64_t tmp;
 431
 432     tmp = (*value >> shift) & mask;
 433     trace_memory_region_ops_write(mr, addr, tmp, size);
 434     mr->ops->old_mmio.write[ctz32(size)](mr->opaque, addr, tmp);
 435     return MEMTX_OK;
 436 }
 437
 438 static MemTxResult memory_region_write_accessor(MemoryRegion *mr,
 439                                                 hwaddr addr,
 440                                                 uint64_t *value,
 441                                                 unsigned size,
 442                                                 unsigned shift,
 443                                                 uint64_t mask,
 444                                                 MemTxAttrs attrs)
 445 {
 446     uint64_t tmp;
 447
 448     tmp = (*value >> shift) & mask;
 449     trace_memory_region_ops_write(mr, addr, tmp, size);
 450     mr->ops->write(mr->opaque, addr, tmp, size);
 451     return MEMTX_OK;
 452 }
 453
 454 static MemTxResult memory_region_write_with_attrs_accessor(MemoryRegion *mr,
 455                                                            hwaddr addr,
 456                                                            uint64_t *value,
 457                                                            unsigned size,
 458                                                            unsigned shift,
 459                                                            uint64_t mask,
 460                                                            MemTxAttrs attrs)
 461 {
 462     uint64_t tmp;
 463
 464     tmp = (*value >> shift) & mask;
 465     trace_memory_region_ops_write(mr, addr, tmp, size);
 466     return mr->ops->write_with_attrs(mr->opaque, addr, tmp, size, attrs);
 467 }
 468
 469 static MemTxResult access_with_adjusted_size(hwaddr addr,
 470                                       uint64_t *value,
 471                                       unsigned size,
 472                                       unsigned access_size_min,
 473                                       unsigned access_size_max,
 474                                       MemTxResult (*access)(MemoryRegion *mr,
 475                                                             hwaddr addr,
 476                                                             uint64_t *value,
 477                                                             unsigned size,
 478                                                             unsigned shift,
 479                                                             uint64_t mask,
 480                                                             MemTxAttrs attrs),
 481                                       MemoryRegion *mr,
 482                                       MemTxAttrs attrs)
 483 {
 484     uint64_t access_mask;
 485     unsigned access_size;
 486     unsigned i;
 487     MemTxResult r = MEMTX_OK;
 488
 489     if (!access_size_min) {
 490         access_size_min = 1;
 491     }
 492     if (!access_size_max) {
 493         access_size_max = 4;
 494     }
 495
 496     /* FIXME: support unaligned access? */
 497     access_size = MAX(MIN(size, access_size_max), access_size_min);
 498     access_mask = -1ULL >> (64 - access_size * 8);
 499     if (memory_region_big_endian(mr)) {
 500         for (i = 0; i < size; i += access_size) {
 501             r |= access(mr, addr + i, value, access_size,
 502                         (size - access_size - i) * 8, access_mask, attrs);
 503         }
 504     } else {
 505         for (i = 0; i < size; i += access_size) {
 506             r |= access(mr, addr + i, value, access_size, i * 8,
 507                         access_mask, attrs);
 508         }
 509     }
 510     return r;
 511 }
 512
 513 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
 514 {
 515     AddressSpace *as;
 516
 517     while (mr->container) {
 518         mr = mr->container;
 519     }
 520     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 521         if (mr == as->root) {
 522             return as;
 523         }
 524     }
 525     return NULL;
 526 }
 527
 528 /* Render a memory region into the global view.  Ranges in @view obscure
 529  * ranges in @mr.
 530  */
 531 static void render_memory_region(FlatView *view,
 532                                  MemoryRegion *mr,
 533                                  Int128 base,
 534                                  AddrRange clip,
 535                                  bool readonly)
 536 {
 537     MemoryRegion *subregion;
 538     unsigned i;
 539     hwaddr offset_in_region;
 540     Int128 remain;
 541     Int128 now;
 542     FlatRange fr;
 543     AddrRange tmp;
 544
 545     if (!mr->enabled) {
 546         return;
 547     }
 548
 549     int128_addto(&base, int128_make64(mr->addr));
 550     readonly |= mr->readonly;
 551
 552     tmp = addrrange_make(base, mr->size);
 553
 554     if (!addrrange_intersects(tmp, clip)) {
 555         return;
 556     }
 557
 558     clip = addrrange_intersection(tmp, clip);
 559
 560     if (mr->alias) {
 561         int128_subfrom(&base, int128_make64(mr->alias->addr));
 562         int128_subfrom(&base, int128_make64(mr->alias_offset));
 563         render_memory_region(view, mr->alias, base, clip, readonly);
 564         return;
 565     }
 566
 567     /* Render subregions in priority order. */
 568     QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) {
 569         render_memory_region(view, subregion, base, clip, readonly);
 570     }
 571
 572     if (!mr->terminates) {
 573         return;
 574     }
 575
 576     offset_in_region = int128_get64(int128_sub(clip.start, base));
 577     base = clip.start;
 578     remain = clip.size;
 579
 580     fr.mr = mr;
 581     fr.dirty_log_mask = memory_region_get_dirty_log_mask(mr);
 582     fr.romd_mode = mr->romd_mode;
 583     fr.readonly = readonly;
 584
 585     /* Render the region itself into any gaps left by the current view. */
 586     for (i = 0; i < view->nr && int128_nz(remain); ++i) {
 587         if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
 588             continue;
 589         }
 590         if (int128_lt(base, view->ranges[i].addr.start)) {
 591             now = int128_min(remain,
 592                              int128_sub(view->ranges[i].addr.start, base));
 593             fr.offset_in_region = offset_in_region;
 594             fr.addr = addrrange_make(base, now);
 595             flatview_insert(view, i, &fr);
 596             ++i;
 597             int128_addto(&base, now);
 598             offset_in_region += int128_get64(now);
 599             int128_subfrom(&remain, now);
 600         }
 601         now = int128_sub(int128_min(int128_add(base, remain),
 602                                     addrrange_end(view->ranges[i].addr)),
 603                          base);
 604         int128_addto(&base, now);
 605         offset_in_region += int128_get64(now);
 606         int128_subfrom(&remain, now);
 607     }
 608     if (int128_nz(remain)) {
 609         fr.offset_in_region = offset_in_region;
 610         fr.addr = addrrange_make(base, remain);
 611         flatview_insert(view, i, &fr);
 612     }
 613 }
 614
 615 /* Render a memory topology into a list of disjoint absolute ranges. */
 616 static FlatView *generate_memory_topology(MemoryRegion *mr)
 617 {
 618     FlatView *view;
 619
 620     view = g_new(FlatView, 1);
 621     flatview_init(view);
 622
 623     if (mr) {
 624         render_memory_region(view, mr, int128_zero(),
 625                              addrrange_make(int128_zero(), int128_2_64()), false);
 626     }
 627     flatview_simplify(view);
 628
 629     return view;
 630 }
 631
 632 static void address_space_add_del_ioeventfds(AddressSpace *as,
 633                                              MemoryRegionIoeventfd *fds_new,
 634                                              unsigned fds_new_nb,
 635                                              MemoryRegionIoeventfd *fds_old,
 636                                              unsigned fds_old_nb)
 637 {
 638     unsigned iold, inew;
 639     MemoryRegionIoeventfd *fd;
 640     MemoryRegionSection section;
 641
 642     /* Generate a symmetric difference of the old and new fd sets, adding
 643      * and deleting as necessary.
 644      */
 645
 646     iold = inew = 0;
 647     while (iold < fds_old_nb || inew < fds_new_nb) {
 648         if (iold < fds_old_nb
 649             && (inew == fds_new_nb
 650                 || memory_region_ioeventfd_before(fds_old[iold],
 651                                                   fds_new[inew]))) {
 652             fd = &fds_old[iold];
 653             section = (MemoryRegionSection) {
 654                 .address_space = as,
 655                 .offset_within_address_space = int128_get64(fd->addr.start),
 656                 .size = fd->addr.size,
 657             };
 658             MEMORY_LISTENER_CALL(eventfd_del, Forward, &section,
 659                                  fd->match_data, fd->data, fd->e);
 660             ++iold;
 661         } else if (inew < fds_new_nb
 662                    && (iold == fds_old_nb
 663                        || memory_region_ioeventfd_before(fds_new[inew],
 664                                                          fds_old[iold]))) {
 665             fd = &fds_new[inew];
 666             section = (MemoryRegionSection) {
 667                 .address_space = as,
 668                 .offset_within_address_space = int128_get64(fd->addr.start),
 669                 .size = fd->addr.size,
 670             };
 671             MEMORY_LISTENER_CALL(eventfd_add, Reverse, &section,
 672                                  fd->match_data, fd->data, fd->e);
 673             ++inew;
 674         } else {
 675             ++iold;
 676             ++inew;
 677         }
 678     }
 679 }
 680
 681 static FlatView *address_space_get_flatview(AddressSpace *as)
 682 {
 683     FlatView *view;
 684
 685     rcu_read_lock();
 686     view = atomic_rcu_read(&as->current_map);
 687     flatview_ref(view);
 688     rcu_read_unlock();
 689     return view;
 690 }
 691
 692 static void address_space_update_ioeventfds(AddressSpace *as)
 693 {
 694     FlatView *view;
 695     FlatRange *fr;
 696     unsigned ioeventfd_nb = 0;
 697     MemoryRegionIoeventfd *ioeventfds = NULL;
 698     AddrRange tmp;
 699     unsigned i;
 700
 701     view = address_space_get_flatview(as);
 702     FOR_EACH_FLAT_RANGE(fr, view) {
 703         for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
 704             tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
 705                                   int128_sub(fr->addr.start,
 706                                              int128_make64(fr->offset_in_region)));
 707             if (addrrange_intersects(fr->addr, tmp)) {
 708                 ++ioeventfd_nb;
 709                 ioeventfds = g_realloc(ioeventfds,
 710                                           ioeventfd_nb * sizeof(*ioeventfds));
 711                 ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i];
 712                 ioeventfds[ioeventfd_nb-1].addr = tmp;
 713             }
 714         }
 715     }
 716
 717     address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb,
 718                                      as->ioeventfds, as->ioeventfd_nb);
 719
 720     g_free(as->ioeventfds);
 721     as->ioeventfds = ioeventfds;
 722     as->ioeventfd_nb = ioeventfd_nb;
 723     flatview_unref(view);
 724 }
 725
 726 static void address_space_update_topology_pass(AddressSpace *as,
 727                                                const FlatView *old_view,
 728                                                const FlatView *new_view,
 729                                                bool adding)
 730 {
 731     unsigned iold, inew;
 732     FlatRange *frold, *frnew;
 733
 734     /* Generate a symmetric difference of the old and new memory maps.
 735      * Kill ranges in the old map, and instantiate ranges in the new map.
 736      */
 737     iold = inew = 0;
 738     while (iold < old_view->nr || inew < new_view->nr) {
 739         if (iold < old_view->nr) {
 740             frold = &old_view->ranges[iold];
 741         } else {
 742             frold = NULL;
 743         }
 744         if (inew < new_view->nr) {
 745             frnew = &new_view->ranges[inew];
 746         } else {
 747             frnew = NULL;
 748         }
 749
 750         if (frold
 751             && (!frnew
 752                 || int128_lt(frold->addr.start, frnew->addr.start)
 753                 || (int128_eq(frold->addr.start, frnew->addr.start)
 754                     && !flatrange_equal(frold, frnew)))) {
 755             /* In old but not in new, or in both but attributes changed. */
 756
 757             if (!adding) {
 758                 MEMORY_LISTENER_UPDATE_REGION(frold, as, Reverse, region_del);
 759             }
 760
 761             ++iold;
 762         } else if (frold && frnew && flatrange_equal(frold, frnew)) {
 763             /* In both and unchanged (except logging may have changed) */
 764
 765             if (adding) {
 766                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_nop);
 767                 if (frnew->dirty_log_mask & ~frold->dirty_log_mask) {
 768                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, log_start,
 769                                                   frold->dirty_log_mask,
 770                                                   frnew->dirty_log_mask);
 771                 }
 772                 if (frold->dirty_log_mask & ~frnew->dirty_log_mask) {
 773                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Reverse, log_stop,
 774                                                   frold->dirty_log_mask,
 775                                                   frnew->dirty_log_mask);
 776                 }
 777             }
 778
 779             ++iold;
 780             ++inew;
 781         } else {
 782             /* In new */
 783
 784             if (adding) {
 785                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_add);
 786             }
 787
 788             ++inew;
 789         }
 790     }
 791 }
 792
 793
 794 static void address_space_update_topology(AddressSpace *as)
 795 {
 796     FlatView *old_view = address_space_get_flatview(as);
 797     FlatView *new_view = generate_memory_topology(as->root);
 798
 799     address_space_update_topology_pass(as, old_view, new_view, false);
 800     address_space_update_topology_pass(as, old_view, new_view, true);
 801
 802     /* Writes are protected by the BQL.  */
 803     atomic_rcu_set(&as->current_map, new_view);
 804     call_rcu(old_view, flatview_unref, rcu);
 805
 806     /* Note that all the old MemoryRegions are still alive up to this
 807      * point.  This relieves most MemoryListeners from the need to
 808      * ref/unref the MemoryRegions they get---unless they use them
 809      * outside the iothread mutex, in which case precise reference
 810      * counting is necessary.
 811      */
 812     flatview_unref(old_view);
 813
 814     address_space_update_ioeventfds(as);
 815 }
 816
 817 void memory_region_transaction_begin(void)
 818 {
 819     qemu_flush_coalesced_mmio_buffer();
 820     ++memory_region_transaction_depth;
 821 }
 822
 823 static void memory_region_clear_pending(void)
 824 {
 825     memory_region_update_pending = false;
 826     ioeventfd_update_pending = false;
 827 }
 828
 829 void memory_region_transaction_commit(void)
 830 {
 831     AddressSpace *as;
 832
 833     assert(memory_region_transaction_depth);
 834     --memory_region_transaction_depth;
 835     if (!memory_region_transaction_depth) {
 836         if (memory_region_update_pending) {
 837             MEMORY_LISTENER_CALL_GLOBAL(begin, Forward);
 838
 839             QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 840                 address_space_update_topology(as);
 841             }
 842
 843             MEMORY_LISTENER_CALL_GLOBAL(commit, Forward);
 844         } else if (ioeventfd_update_pending) {
 845             QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 846                 address_space_update_ioeventfds(as);
 847             }
 848         }
 849         memory_region_clear_pending();
 850    }
 851 }
 852
 853 static void memory_region_destructor_none(MemoryRegion *mr)
 854 {
 855 }
 856
 857 static void memory_region_destructor_ram(MemoryRegion *mr)
 858 {
 859     qemu_ram_free(mr->ram_addr);
 860 }
 861
 862 static void memory_region_destructor_alias(MemoryRegion *mr)
 863 {
 864     memory_region_unref(mr->alias);
 865 }
 866
 867 static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
 868 {
 869     qemu_ram_free_from_ptr(mr->ram_addr);
 870 }
 871
 872 static void memory_region_destructor_rom_device(MemoryRegion *mr)
 873 {
 874     qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
 875 }
 876
 877 static bool memory_region_need_escape(char c)
 878 {
 879     return c == '/' || c == '[' || c == '\\' || c == ']';
 880 }
 881
 882 static char *memory_region_escape_name(const char *name)
 883 {
 884     const char *p;
 885     char *escaped, *q;
 886     uint8_t c;
 887     size_t bytes = 0;
 888
 889     for (p = name; *p; p++) {
 890         bytes += memory_region_need_escape(*p) ? 4 : 1;
 891     }
 892     if (bytes == p - name) {
 893        return g_memdup(name, bytes + 1);
 894     }
 895
 896     escaped = g_malloc(bytes + 1);
 897     for (p = name, q = escaped; *p; p++) {
 898         c = *p;
 899         if (unlikely(memory_region_need_escape(c))) {
 900             *q++ = '\\';
 901             *q++ = 'x';
 902             *q++ = "0123456789abcdef"[c >> 4];
 903             c = "0123456789abcdef"[c & 15];
 904         }
 905         *q++ = c;
 906     }
 907     *q = 0;
 908     return escaped;
 909 }
 910
 911 void memory_region_init(MemoryRegion *mr,
 912                         Object *owner,
 913                         const char *name,
 914                         uint64_t size)
 915 {
 916     if (!owner) {
 917         owner = container_get(qdev_get_machine(), "/unattached");
 918     }
 919
 920     object_initialize(mr, sizeof(*mr), TYPE_MEMORY_REGION);
 921     mr->size = int128_make64(size);
 922     if (size == UINT64_MAX) {
 923         mr->size = int128_2_64();
 924     }
 925     mr->name = g_strdup(name);
 926
 927     if (name) {
 928         char *escaped_name = memory_region_escape_name(name);
 929         char *name_array = g_strdup_printf("%s[*]", escaped_name);
 930         object_property_add_child(owner, name_array, OBJECT(mr), &error_abort);
 931         object_unref(OBJECT(mr));
 932         g_free(name_array);
 933         g_free(escaped_name);
 934     }
 935 }
 936
 937 static void memory_region_get_addr(Object *obj, Visitor *v, void *opaque,
 938                                    const char *name, Error **errp)
 939 {
 940     MemoryRegion *mr = MEMORY_REGION(obj);
 941     uint64_t value = mr->addr;
 942
 943     visit_type_uint64(v, &value, name, errp);
 944 }
 945
 946 static void memory_region_get_container(Object *obj, Visitor *v, void *opaque,
 947                                         const char *name, Error **errp)
 948 {
 949     MemoryRegion *mr = MEMORY_REGION(obj);
 950     gchar *path = (gchar *)"";
 951
 952     if (mr->container) {
 953         path = object_get_canonical_path(OBJECT(mr->container));
 954     }
 955     visit_type_str(v, &path, name, errp);
 956     if (mr->container) {
 957         g_free(path);
 958     }
 959 }
 960
 961 static Object *memory_region_resolve_container(Object *obj, void *opaque,
 962                                                const char *part)
 963 {
 964     MemoryRegion *mr = MEMORY_REGION(obj);
 965
 966     return OBJECT(mr->container);
 967 }
 968
 969 static void memory_region_get_priority(Object *obj, Visitor *v, void *opaque,
 970                                        const char *name, Error **errp)
 971 {
 972     MemoryRegion *mr = MEMORY_REGION(obj);
 973     int32_t value = mr->priority;
 974
 975     visit_type_int32(v, &value, name, errp);
 976 }
 977
 978 static bool memory_region_get_may_overlap(Object *obj, Error **errp)
 979 {
 980     MemoryRegion *mr = MEMORY_REGION(obj);
 981
 982     return mr->may_overlap;
 983 }
 984
 985 static void memory_region_get_size(Object *obj, Visitor *v, void *opaque,
 986                                    const char *name, Error **errp)
 987 {
 988     MemoryRegion *mr = MEMORY_REGION(obj);
 989     uint64_t value = memory_region_size(mr);
 990
 991     visit_type_uint64(v, &value, name, errp);
 992 }
 993
 994 static void memory_region_initfn(Object *obj)
 995 {
 996     MemoryRegion *mr = MEMORY_REGION(obj);
 997     ObjectProperty *op;
 998
 999     mr->ops = &unassigned_mem_ops;
1000     mr->ram_addr = RAM_ADDR_INVALID;
1001     mr->enabled = true;
1002     mr->romd_mode = true;
1003     mr->global_locking = true;
1004     mr->destructor = memory_region_destructor_none;
1005     QTAILQ_INIT(&mr->subregions);
1006     QTAILQ_INIT(&mr->coalesced);
1007
1008     op = object_property_add(OBJECT(mr), "container",
1009                              "link<" TYPE_MEMORY_REGION ">",
1010                              memory_region_get_container,
1011                              NULL, /* memory_region_set_container */
1012                              NULL, NULL, &error_abort);
1013     op->resolve = memory_region_resolve_container;
1014
1015     object_property_add(OBJECT(mr), "addr", "uint64",
1016                         memory_region_get_addr,
1017                         NULL, /* memory_region_set_addr */
1018                         NULL, NULL, &error_abort);
1019     object_property_add(OBJECT(mr), "priority", "uint32",
1020                         memory_region_get_priority,
1021                         NULL, /* memory_region_set_priority */
1022                         NULL, NULL, &error_abort);
1023     object_property_add_bool(OBJECT(mr), "may-overlap",
1024                              memory_region_get_may_overlap,
1025                              NULL, /* memory_region_set_may_overlap */
1026                              &error_abort);
1027     object_property_add(OBJECT(mr), "size", "uint64",
1028                         memory_region_get_size,
1029                         NULL, /* memory_region_set_size, */
1030                         NULL, NULL, &error_abort);
1031 }
1032
1033 static uint64_t unassigned_mem_read(void *opaque, hwaddr addr,
1034                                     unsigned size)
1035 {
1036 #ifdef DEBUG_UNASSIGNED
1037     printf("Unassigned mem read " TARGET_FMT_plx "\n", addr);
1038 #endif
1039     if (current_cpu != NULL) {
1040         cpu_unassigned_access(current_cpu, addr, false, false, 0, size);
1041     }
1042     return 0;
1043 }
1044
1045 static void unassigned_mem_write(void *opaque, hwaddr addr,
1046                                  uint64_t val, unsigned size)
1047 {
1048 #ifdef DEBUG_UNASSIGNED
1049     printf("Unassigned mem write " TARGET_FMT_plx " = 0x%"PRIx64"\n", addr, val);
1050 #endif
1051     if (current_cpu != NULL) {
1052         cpu_unassigned_access(current_cpu, addr, true, false, 0, size);
1053     }
1054 }
1055
1056 static bool unassigned_mem_accepts(void *opaque, hwaddr addr,
1057                                    unsigned size, bool is_write)
1058 {
1059     return false;
1060 }
1061
1062 const MemoryRegionOps unassigned_mem_ops = {
1063     .valid.accepts = unassigned_mem_accepts,
1064     .endianness = DEVICE_NATIVE_ENDIAN,
1065 };
1066
1067 bool memory_region_access_valid(MemoryRegion *mr,
1068                                 hwaddr addr,
1069                                 unsigned size,
1070                                 bool is_write)
1071 {
1072     int access_size_min, access_size_max;
1073     int access_size, i;
1074
1075     if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
1076         return false;
1077     }
1078
1079     if (!mr->ops->valid.accepts) {
1080         return true;
1081     }
1082
1083     access_size_min = mr->ops->valid.min_access_size;
1084     if (!mr->ops->valid.min_access_size) {
1085         access_size_min = 1;
1086     }
1087
1088     access_size_max = mr->ops->valid.max_access_size;
1089     if (!mr->ops->valid.max_access_size) {
1090         access_size_max = 4;
1091     }
1092
1093     access_size = MAX(MIN(size, access_size_max), access_size_min);
1094     for (i = 0; i < size; i += access_size) {
1095         if (!mr->ops->valid.accepts(mr->opaque, addr + i, access_size,
1096                                     is_write)) {
1097             return false;
1098         }
1099     }
1100
1101     return true;
1102 }
1103
1104 static MemTxResult memory_region_dispatch_read1(MemoryRegion *mr,
1105                                                 hwaddr addr,
1106                                                 uint64_t *pval,
1107                                                 unsigned size,
1108                                                 MemTxAttrs attrs)
1109 {
1110     *pval = 0;
1111
1112     if (mr->ops->read) {
1113         return access_with_adjusted_size(addr, pval, size,
1114                                          mr->ops->impl.min_access_size,
1115                                          mr->ops->impl.max_access_size,
1116                                          memory_region_read_accessor,
1117                                          mr, attrs);
1118     } else if (mr->ops->read_with_attrs) {
1119         return access_with_adjusted_size(addr, pval, size,
1120                                          mr->ops->impl.min_access_size,
1121                                          mr->ops->impl.max_access_size,
1122                                          memory_region_read_with_attrs_accessor,
1123                                          mr, attrs);
1124     } else {
1125         return access_with_adjusted_size(addr, pval, size, 1, 4,
1126                                          memory_region_oldmmio_read_accessor,
1127                                          mr, attrs);
1128     }
1129 }
1130
1131 MemTxResult memory_region_dispatch_read(MemoryRegion *mr,
1132                                         hwaddr addr,
1133                                         uint64_t *pval,
1134                                         unsigned size,
1135                                         MemTxAttrs attrs)
1136 {
1137     MemTxResult r;
1138
1139     if (!memory_region_access_valid(mr, addr, size, false)) {
1140         *pval = unassigned_mem_read(mr, addr, size);
1141         return MEMTX_DECODE_ERROR;
1142     }
1143
1144     r = memory_region_dispatch_read1(mr, addr, pval, size, attrs);
1145     adjust_endianness(mr, pval, size);
1146     return r;
1147 }
1148
1149 MemTxResult memory_region_dispatch_write(MemoryRegion *mr,
1150                                          hwaddr addr,
1151                                          uint64_t data,
1152                                          unsigned size,
1153                                          MemTxAttrs attrs)
1154 {
1155     if (!memory_region_access_valid(mr, addr, size, true)) {
1156         unassigned_mem_write(mr, addr, data, size);
1157         return MEMTX_DECODE_ERROR;
1158     }
1159
1160     adjust_endianness(mr, &data, size);
1161
1162     if (mr->ops->write) {
1163         return access_with_adjusted_size(addr, &data, size,
1164                                          mr->ops->impl.min_access_size,
1165                                          mr->ops->impl.max_access_size,
1166                                          memory_region_write_accessor, mr,
1167                                          attrs);
1168     } else if (mr->ops->write_with_attrs) {
1169         return
1170             access_with_adjusted_size(addr, &data, size,
1171                                       mr->ops->impl.min_access_size,
1172                                       mr->ops->impl.max_access_size,
1173                                       memory_region_write_with_attrs_accessor,
1174                                       mr, attrs);
1175     } else {
1176         return access_with_adjusted_size(addr, &data, size, 1, 4,
1177                                          memory_region_oldmmio_write_accessor,
1178                                          mr, attrs);
1179     }
1180 }
1181
1182 void memory_region_init_io(MemoryRegion *mr,
1183                            Object *owner,
1184                            const MemoryRegionOps *ops,
1185                            void *opaque,
1186                            const char *name,
1187                            uint64_t size)
1188 {
1189     memory_region_init(mr, owner, name, size);
1190     mr->ops = ops;
1191     mr->opaque = opaque;
1192     mr->terminates = true;
1193 }
1194
1195 void memory_region_init_ram(MemoryRegion *mr,
1196                             Object *owner,
1197                             const char *name,
1198                             uint64_t size,
1199                             Error **errp)
1200 {
1201     memory_region_init(mr, owner, name, size);
1202     mr->ram = true;
1203     mr->terminates = true;
1204     mr->destructor = memory_region_destructor_ram;
1205     mr->ram_addr = qemu_ram_alloc(size, mr, errp);
1206     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
1207 }
1208
1209 void memory_region_init_resizeable_ram(MemoryRegion *mr,
1210                                        Object *owner,
1211                                        const char *name,
1212                                        uint64_t size,
1213                                        uint64_t max_size,
1214                                        void (*resized)(const char*,
1215                                                        uint64_t length,
1216                                                        void *host),
1217                                        Error **errp)
1218 {
1219     memory_region_init(mr, owner, name, size);
1220     mr->ram = true;
1221     mr->terminates = true;
1222     mr->destructor = memory_region_destructor_ram;
1223     mr->ram_addr = qemu_ram_alloc_resizeable(size, max_size, resized, mr, errp);
1224     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
1225 }
1226
1227 #ifdef __linux__
1228 void memory_region_init_ram_from_file(MemoryRegion *mr,
1229                                       struct Object *owner,
1230                                       const char *name,
1231                                       uint64_t size,
1232                                       bool share,
1233                                       const char *path,
1234                                       Error **errp)
1235 {
1236     memory_region_init(mr, owner, name, size);
1237     mr->ram = true;
1238     mr->terminates = true;
1239     mr->destructor = memory_region_destructor_ram;
1240     mr->ram_addr = qemu_ram_alloc_from_file(size, mr, share, path, errp);
1241     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
1242 }
1243 #endif
1244
1245 void memory_region_init_ram_ptr(MemoryRegion *mr,
1246                                 Object *owner,
1247                                 const char *name,
1248                                 uint64_t size,
1249                                 void *ptr)
1250 {
1251     memory_region_init(mr, owner, name, size);
1252     mr->ram = true;
1253     mr->terminates = true;
1254     mr->destructor = memory_region_destructor_ram_from_ptr;
1255     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
1256
1257     /* qemu_ram_alloc_from_ptr cannot fail with ptr != NULL.  */
1258     assert(ptr != NULL);
1259     mr->ram_addr = qemu_ram_alloc_from_ptr(size, ptr, mr, &error_abort);
1260 }
1261
1262 void memory_region_set_skip_dump(MemoryRegion *mr)
1263 {
1264     mr->skip_dump = true;
1265 }
1266
1267 void memory_region_init_alias(MemoryRegion *mr,
1268                               Object *owner,
1269                               const char *name,
1270                               MemoryRegion *orig,
1271                               hwaddr offset,
1272                               uint64_t size)
1273 {
1274     memory_region_init(mr, owner, name, size);
1275     memory_region_ref(orig);
1276     mr->destructor = memory_region_destructor_alias;
1277     mr->alias = orig;
1278     mr->alias_offset = offset;
1279 }
1280
1281 void memory_region_init_rom_device(MemoryRegion *mr,
1282                                    Object *owner,
1283                                    const MemoryRegionOps *ops,
1284                                    void *opaque,
1285                                    const char *name,
1286                                    uint64_t size,
1287                                    Error **errp)
1288 {
1289     memory_region_init(mr, owner, name, size);
1290     mr->ops = ops;
1291     mr->opaque = opaque;
1292     mr->terminates = true;
1293     mr->rom_device = true;
1294     mr->destructor = memory_region_destructor_rom_device;
1295     mr->ram_addr = qemu_ram_alloc(size, mr, errp);
1296 }
1297
1298 void memory_region_init_iommu(MemoryRegion *mr,
1299                               Object *owner,
1300                               const MemoryRegionIOMMUOps *ops,
1301                               const char *name,
1302                               uint64_t size)
1303 {
1304     memory_region_init(mr, owner, name, size);
1305     mr->iommu_ops = ops,
1306     mr->terminates = true;  /* then re-forwards */
1307     notifier_list_init(&mr->iommu_notify);
1308 }
1309
1310 void memory_region_init_reservation(MemoryRegion *mr,
1311                                     Object *owner,
1312                                     const char *name,
1313                                     uint64_t size)
1314 {
1315     memory_region_init_io(mr, owner, &unassigned_mem_ops, mr, name, size);
1316 }
1317
1318 static void memory_region_finalize(Object *obj)
1319 {
1320     MemoryRegion *mr = MEMORY_REGION(obj);
1321
1322     assert(QTAILQ_EMPTY(&mr->subregions));
1323     mr->destructor(mr);
1324     memory_region_clear_coalescing(mr);
1325     g_free((char *)mr->name);
1326     g_free(mr->ioeventfds);
1327 }
1328
1329 Object *memory_region_owner(MemoryRegion *mr)
1330 {
1331     Object *obj = OBJECT(mr);
1332     return obj->parent;
1333 }
1334
1335 void memory_region_ref(MemoryRegion *mr)
1336 {
1337     /* MMIO callbacks most likely will access data that belongs
1338      * to the owner, hence the need to ref/unref the owner whenever
1339      * the memory region is in use.
1340      *
1341      * The memory region is a child of its owner.  As long as the
1342      * owner doesn't call unparent itself on the memory region,
1343      * ref-ing the owner will also keep the memory region alive.
1344      * Memory regions without an owner are supposed to never go away,
1345      * but we still ref/unref them for debugging purposes.
1346      */
1347     Object *obj = OBJECT(mr);
1348     if (obj && obj->parent) {
1349         object_ref(obj->parent);
1350     } else {
1351         object_ref(obj);
1352     }
1353 }
1354
1355 void memory_region_unref(MemoryRegion *mr)
1356 {
1357     Object *obj = OBJECT(mr);
1358     if (obj && obj->parent) {
1359         object_unref(obj->parent);
1360     } else {
1361         object_unref(obj);
1362     }
1363 }
1364
1365 uint64_t memory_region_size(MemoryRegion *mr)
1366 {
1367     if (int128_eq(mr->size, int128_2_64())) {
1368         return UINT64_MAX;
1369     }
1370     return int128_get64(mr->size);
1371 }
1372
1373 const char *memory_region_name(const MemoryRegion *mr)
1374 {
1375     if (!mr->name) {
1376         ((MemoryRegion *)mr)->name =
1377             object_get_canonical_path_component(OBJECT(mr));
1378     }
1379     return mr->name;
1380 }
1381
1382 bool memory_region_is_ram(MemoryRegion *mr)
1383 {
1384     return mr->ram;
1385 }
1386
1387 bool memory_region_is_skip_dump(MemoryRegion *mr)
1388 {
1389     return mr->skip_dump;
1390 }
1391
1392 uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr)
1393 {
1394     uint8_t mask = mr->dirty_log_mask;
1395     if (global_dirty_log) {
1396         mask |= (1 << DIRTY_MEMORY_MIGRATION);
1397     }
1398     return mask;
1399 }
1400
1401 bool memory_region_is_logging(MemoryRegion *mr, uint8_t client)
1402 {
1403     return memory_region_get_dirty_log_mask(mr) & (1 << client);
1404 }
1405
1406 bool memory_region_is_rom(MemoryRegion *mr)
1407 {
1408     return mr->ram && mr->readonly;
1409 }
1410
1411 bool memory_region_is_iommu(MemoryRegion *mr)
1412 {
1413     return mr->iommu_ops;
1414 }
1415
1416 void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n)
1417 {
1418     notifier_list_add(&mr->iommu_notify, n);
1419 }
1420
1421 void memory_region_unregister_iommu_notifier(Notifier *n)
1422 {
1423     notifier_remove(n);
1424 }
1425
1426 void memory_region_notify_iommu(MemoryRegion *mr,
1427                                 IOMMUTLBEntry entry)
1428 {
1429     assert(memory_region_is_iommu(mr));
1430     notifier_list_notify(&mr->iommu_notify, &entry);
1431 }
1432
1433 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
1434 {
1435     uint8_t mask = 1 << client;
1436
1437     assert(client == DIRTY_MEMORY_VGA);
1438     memory_region_transaction_begin();
1439     mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
1440     memory_region_update_pending |= mr->enabled;
1441     memory_region_transaction_commit();
1442 }
1443
1444 bool memory_region_get_dirty(MemoryRegion *mr, hwaddr addr,
1445                              hwaddr size, unsigned client)
1446 {
1447     assert(mr->ram_addr != RAM_ADDR_INVALID);
1448     return cpu_physical_memory_get_dirty(mr->ram_addr + addr, size, client);
1449 }
1450
1451 void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,
1452                              hwaddr size)
1453 {
1454     assert(mr->ram_addr != RAM_ADDR_INVALID);
1455     cpu_physical_memory_set_dirty_range(mr->ram_addr + addr, size,
1456                                         memory_region_get_dirty_log_mask(mr));
1457 }
1458
1459 bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr,
1460                                         hwaddr size, unsigned client)
1461 {
1462     assert(mr->ram_addr != RAM_ADDR_INVALID);
1463     return cpu_physical_memory_test_and_clear_dirty(mr->ram_addr + addr,
1464                                                     size, client);
1465 }
1466
1467
1468 void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
1469 {
1470     AddressSpace *as;
1471     FlatRange *fr;
1472
1473     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1474         FlatView *view = address_space_get_flatview(as);
1475         FOR_EACH_FLAT_RANGE(fr, view) {
1476             if (fr->mr == mr) {
1477                 MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1478             }
1479         }
1480         flatview_unref(view);
1481     }
1482 }
1483
1484 void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
1485 {
1486     if (mr->readonly != readonly) {
1487         memory_region_transaction_begin();
1488         mr->readonly = readonly;
1489         memory_region_update_pending |= mr->enabled;
1490         memory_region_transaction_commit();
1491     }
1492 }
1493
1494 void memory_region_rom_device_set_romd(MemoryRegion *mr, bool romd_mode)
1495 {
1496     if (mr->romd_mode != romd_mode) {
1497         memory_region_transaction_begin();
1498         mr->romd_mode = romd_mode;
1499         memory_region_update_pending |= mr->enabled;
1500         memory_region_transaction_commit();
1501     }
1502 }
1503
1504 void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
1505                                hwaddr size, unsigned client)
1506 {
1507     assert(mr->ram_addr != RAM_ADDR_INVALID);
1508     cpu_physical_memory_test_and_clear_dirty(mr->ram_addr + addr, size,
1509                                              client);
1510 }
1511
1512 int memory_region_get_fd(MemoryRegion *mr)
1513 {
1514     if (mr->alias) {
1515         return memory_region_get_fd(mr->alias);
1516     }
1517
1518     assert(mr->ram_addr != RAM_ADDR_INVALID);
1519
1520     return qemu_get_ram_fd(mr->ram_addr & TARGET_PAGE_MASK);
1521 }
1522
1523 void *memory_region_get_ram_ptr(MemoryRegion *mr)
1524 {
1525     if (mr->alias) {
1526         return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset;
1527     }
1528
1529     assert(mr->ram_addr != RAM_ADDR_INVALID);
1530
1531     return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
1532 }
1533
1534 void memory_region_ram_resize(MemoryRegion *mr, ram_addr_t newsize, Error **errp)
1535 {
1536     assert(mr->ram_addr != RAM_ADDR_INVALID);
1537
1538     qemu_ram_resize(mr->ram_addr, newsize, errp);
1539 }
1540
1541 static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as)
1542 {
1543     FlatView *view;
1544     FlatRange *fr;
1545     CoalescedMemoryRange *cmr;
1546     AddrRange tmp;
1547     MemoryRegionSection section;
1548
1549     view = address_space_get_flatview(as);
1550     FOR_EACH_FLAT_RANGE(fr, view) {
1551         if (fr->mr == mr) {
1552             section = (MemoryRegionSection) {
1553                 .address_space = as,
1554                 .offset_within_address_space = int128_get64(fr->addr.start),
1555                 .size = fr->addr.size,
1556             };
1557
1558             MEMORY_LISTENER_CALL(coalesced_mmio_del, Reverse, &section,
1559                                  int128_get64(fr->addr.start),
1560                                  int128_get64(fr->addr.size));
1561             QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
1562                 tmp = addrrange_shift(cmr->addr,
1563                                       int128_sub(fr->addr.start,
1564                                                  int128_make64(fr->offset_in_region)));
1565                 if (!addrrange_intersects(tmp, fr->addr)) {
1566                     continue;
1567                 }
1568                 tmp = addrrange_intersection(tmp, fr->addr);
1569                 MEMORY_LISTENER_CALL(coalesced_mmio_add, Forward, &section,
1570                                      int128_get64(tmp.start),
1571                                      int128_get64(tmp.size));
1572             }
1573         }
1574     }
1575     flatview_unref(view);
1576 }
1577
1578 static void memory_region_update_coalesced_range(MemoryRegion *mr)
1579 {
1580     AddressSpace *as;
1581
1582     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1583         memory_region_update_coalesced_range_as(mr, as);
1584     }
1585 }
1586
1587 void memory_region_set_coalescing(MemoryRegion *mr)
1588 {
1589     memory_region_clear_coalescing(mr);
1590     memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
1591 }
1592
1593 void memory_region_add_coalescing(MemoryRegion *mr,
1594                                   hwaddr offset,
1595                                   uint64_t size)
1596 {
1597     CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
1598
1599     cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
1600     QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
1601     memory_region_update_coalesced_range(mr);
1602     memory_region_set_flush_coalesced(mr);
1603 }
1604
1605 void memory_region_clear_coalescing(MemoryRegion *mr)
1606 {
1607     CoalescedMemoryRange *cmr;
1608     bool updated = false;
1609
1610     qemu_flush_coalesced_mmio_buffer();
1611     mr->flush_coalesced_mmio = false;
1612
1613     while (!QTAILQ_EMPTY(&mr->coalesced)) {
1614         cmr = QTAILQ_FIRST(&mr->coalesced);
1615         QTAILQ_REMOVE(&mr->coalesced, cmr, link);
1616         g_free(cmr);
1617         updated = true;
1618     }
1619
1620     if (updated) {
1621         memory_region_update_coalesced_range(mr);
1622     }
1623 }
1624
1625 void memory_region_set_flush_coalesced(MemoryRegion *mr)
1626 {
1627     mr->flush_coalesced_mmio = true;
1628 }
1629
1630 void memory_region_clear_flush_coalesced(MemoryRegion *mr)
1631 {
1632     qemu_flush_coalesced_mmio_buffer();
1633     if (QTAILQ_EMPTY(&mr->coalesced)) {
1634         mr->flush_coalesced_mmio = false;
1635     }
1636 }
1637
1638 void memory_region_set_global_locking(MemoryRegion *mr)
1639 {
1640     mr->global_locking = true;
1641 }
1642
1643 void memory_region_clear_global_locking(MemoryRegion *mr)
1644 {
1645     mr->global_locking = false;
1646 }
1647
1648 void memory_region_add_eventfd(MemoryRegion *mr,
1649                                hwaddr addr,
1650                                unsigned size,
1651                                bool match_data,
1652                                uint64_t data,
1653                                EventNotifier *e)
1654 {
1655     MemoryRegionIoeventfd mrfd = {
1656         .addr.start = int128_make64(addr),
1657         .addr.size = int128_make64(size),
1658         .match_data = match_data,
1659         .data = data,
1660         .e = e,
1661     };
1662     unsigned i;
1663
1664     adjust_endianness(mr, &mrfd.data, size);
1665     memory_region_transaction_begin();
1666     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1667         if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
1668             break;
1669         }
1670     }
1671     ++mr->ioeventfd_nb;
1672     mr->ioeventfds = g_realloc(mr->ioeventfds,
1673                                   sizeof(*mr->ioeventfds) * mr->ioeventfd_nb);
1674     memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i],
1675             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i));
1676     mr->ioeventfds[i] = mrfd;
1677     ioeventfd_update_pending |= mr->enabled;
1678     memory_region_transaction_commit();
1679 }
1680
1681 void memory_region_del_eventfd(MemoryRegion *mr,
1682                                hwaddr addr,
1683                                unsigned size,
1684                                bool match_data,
1685                                uint64_t data,
1686                                EventNotifier *e)
1687 {
1688     MemoryRegionIoeventfd mrfd = {
1689         .addr.start = int128_make64(addr),
1690         .addr.size = int128_make64(size),
1691         .match_data = match_data,
1692         .data = data,
1693         .e = e,
1694     };
1695     unsigned i;
1696
1697     adjust_endianness(mr, &mrfd.data, size);
1698     memory_region_transaction_begin();
1699     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1700         if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {
1701             break;
1702         }
1703     }
1704     assert(i != mr->ioeventfd_nb);
1705     memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1],
1706             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1)));
1707     --mr->ioeventfd_nb;
1708     mr->ioeventfds = g_realloc(mr->ioeventfds,
1709                                   sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1);
1710     ioeventfd_update_pending |= mr->enabled;
1711     memory_region_transaction_commit();
1712 }
1713
1714 static void memory_region_update_container_subregions(MemoryRegion *subregion)
1715 {
1716     hwaddr offset = subregion->addr;
1717     MemoryRegion *mr = subregion->container;
1718     MemoryRegion *other;
1719
1720     memory_region_transaction_begin();
1721
1722     memory_region_ref(subregion);
1723     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1724         if (subregion->may_overlap || other->may_overlap) {
1725             continue;
1726         }
1727         if (int128_ge(int128_make64(offset),
1728                       int128_add(int128_make64(other->addr), other->size))
1729             || int128_le(int128_add(int128_make64(offset), subregion->size),
1730                          int128_make64(other->addr))) {
1731             continue;
1732         }
1733 #if 0
1734         printf("warning: subregion collision %llx/%llx (%s) "
1735                "vs %llx/%llx (%s)\n",
1736                (unsigned long long)offset,
1737                (unsigned long long)int128_get64(subregion->size),
1738                subregion->name,
1739                (unsigned long long)other->addr,
1740                (unsigned long long)int128_get64(other->size),
1741                other->name);
1742 #endif
1743     }
1744     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1745         if (subregion->priority >= other->priority) {
1746             QTAILQ_INSERT_BEFORE(other, subregion, subregions_link);
1747             goto done;
1748         }
1749     }
1750     QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link);
1751 done:
1752     memory_region_update_pending |= mr->enabled && subregion->enabled;
1753     memory_region_transaction_commit();
1754 }
1755
1756 static void memory_region_add_subregion_common(MemoryRegion *mr,
1757                                                hwaddr offset,
1758                                                MemoryRegion *subregion)
1759 {
1760     assert(!subregion->container);
1761     subregion->container = mr;
1762     subregion->addr = offset;
1763     memory_region_update_container_subregions(subregion);
1764 }
1765
1766 void memory_region_add_subregion(MemoryRegion *mr,
1767                                  hwaddr offset,
1768                                  MemoryRegion *subregion)
1769 {
1770     subregion->may_overlap = false;
1771     subregion->priority = 0;
1772     memory_region_add_subregion_common(mr, offset, subregion);
1773 }
1774
1775 void memory_region_add_subregion_overlap(MemoryRegion *mr,
1776                                          hwaddr offset,
1777                                          MemoryRegion *subregion,
1778                                          int priority)
1779 {
1780     subregion->may_overlap = true;
1781     subregion->priority = priority;
1782     memory_region_add_subregion_common(mr, offset, subregion);
1783 }
1784
1785 void memory_region_del_subregion(MemoryRegion *mr,
1786                                  MemoryRegion *subregion)
1787 {
1788     memory_region_transaction_begin();
1789     assert(subregion->container == mr);
1790     subregion->container = NULL;
1791     QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
1792     memory_region_unref(subregion);
1793     memory_region_update_pending |= mr->enabled && subregion->enabled;
1794     memory_region_transaction_commit();
1795 }
1796
1797 void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
1798 {
1799     if (enabled == mr->enabled) {
1800         return;
1801     }
1802     memory_region_transaction_begin();
1803     mr->enabled = enabled;
1804     memory_region_update_pending = true;
1805     memory_region_transaction_commit();
1806 }
1807
1808 void memory_region_set_size(MemoryRegion *mr, uint64_t size)
1809 {
1810     Int128 s = int128_make64(size);
1811
1812     if (size == UINT64_MAX) {
1813         s = int128_2_64();
1814     }
1815     if (int128_eq(s, mr->size)) {
1816         return;
1817     }
1818     memory_region_transaction_begin();
1819     mr->size = s;
1820     memory_region_update_pending = true;
1821     memory_region_transaction_commit();
1822 }
1823
1824 static void memory_region_readd_subregion(MemoryRegion *mr)
1825 {
1826     MemoryRegion *container = mr->container;
1827
1828     if (container) {
1829         memory_region_transaction_begin();
1830         memory_region_ref(mr);
1831         memory_region_del_subregion(container, mr);
1832         mr->container = container;
1833         memory_region_update_container_subregions(mr);
1834         memory_region_unref(mr);
1835         memory_region_transaction_commit();
1836     }
1837 }
1838
1839 void memory_region_set_address(MemoryRegion *mr, hwaddr addr)
1840 {
1841     if (addr != mr->addr) {
1842         mr->addr = addr;
1843         memory_region_readd_subregion(mr);
1844     }
1845 }
1846
1847 void memory_region_set_alias_offset(MemoryRegion *mr, hwaddr offset)
1848 {
1849     assert(mr->alias);
1850
1851     if (offset == mr->alias_offset) {
1852         return;
1853     }
1854
1855     memory_region_transaction_begin();
1856     mr->alias_offset = offset;
1857     memory_region_update_pending |= mr->enabled;
1858     memory_region_transaction_commit();
1859 }
1860
1861 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
1862 {
1863     return mr->ram_addr;
1864 }
1865
1866 uint64_t memory_region_get_alignment(const MemoryRegion *mr)
1867 {
1868     return mr->align;
1869 }
1870
1871 static int cmp_flatrange_addr(const void *addr_, const void *fr_)
1872 {
1873     const AddrRange *addr = addr_;
1874     const FlatRange *fr = fr_;
1875
1876     if (int128_le(addrrange_end(*addr), fr->addr.start)) {
1877         return -1;
1878     } else if (int128_ge(addr->start, addrrange_end(fr->addr))) {
1879         return 1;
1880     }
1881     return 0;
1882 }
1883
1884 static FlatRange *flatview_lookup(FlatView *view, AddrRange addr)
1885 {
1886     return bsearch(&addr, view->ranges, view->nr,
1887                    sizeof(FlatRange), cmp_flatrange_addr);
1888 }
1889
1890 bool memory_region_present(MemoryRegion *container, hwaddr addr)
1891 {
1892     MemoryRegion *mr = memory_region_find(container, addr, 1).mr;
1893     if (!mr || (mr == container)) {
1894         return false;
1895     }
1896     memory_region_unref(mr);
1897     return true;
1898 }
1899
1900 bool memory_region_is_mapped(MemoryRegion *mr)
1901 {
1902     return mr->container ? true : false;
1903 }
1904
1905 MemoryRegionSection memory_region_find(MemoryRegion *mr,
1906                                        hwaddr addr, uint64_t size)
1907 {
1908     MemoryRegionSection ret = { .mr = NULL };
1909     MemoryRegion *root;
1910     AddressSpace *as;
1911     AddrRange range;
1912     FlatView *view;
1913     FlatRange *fr;
1914
1915     addr += mr->addr;
1916     for (root = mr; root->container; ) {
1917         root = root->container;
1918         addr += root->addr;
1919     }
1920
1921     as = memory_region_to_address_space(root);
1922     if (!as) {
1923         return ret;
1924     }
1925     range = addrrange_make(int128_make64(addr), int128_make64(size));
1926
1927     rcu_read_lock();
1928     view = atomic_rcu_read(&as->current_map);
1929     fr = flatview_lookup(view, range);
1930     if (!fr) {
1931         goto out;
1932     }
1933
1934     while (fr > view->ranges && addrrange_intersects(fr[-1].addr, range)) {
1935         --fr;
1936     }
1937
1938     ret.mr = fr->mr;
1939     ret.address_space = as;
1940     range = addrrange_intersection(range, fr->addr);
1941     ret.offset_within_region = fr->offset_in_region;
1942     ret.offset_within_region += int128_get64(int128_sub(range.start,
1943                                                         fr->addr.start));
1944     ret.size = range.size;
1945     ret.offset_within_address_space = int128_get64(range.start);
1946     ret.readonly = fr->readonly;
1947     memory_region_ref(ret.mr);
1948 out:
1949     rcu_read_unlock();
1950     return ret;
1951 }
1952
1953 void address_space_sync_dirty_bitmap(AddressSpace *as)
1954 {
1955     FlatView *view;
1956     FlatRange *fr;
1957
1958     view = address_space_get_flatview(as);
1959     FOR_EACH_FLAT_RANGE(fr, view) {
1960         MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1961     }
1962     flatview_unref(view);
1963 }
1964
1965 void memory_global_dirty_log_start(void)
1966 {
1967     global_dirty_log = true;
1968
1969     MEMORY_LISTENER_CALL_GLOBAL(log_global_start, Forward);
1970
1971     /* Refresh DIRTY_LOG_MIGRATION bit.  */
1972     memory_region_transaction_begin();
1973     memory_region_update_pending = true;
1974     memory_region_transaction_commit();
1975 }
1976
1977 void memory_global_dirty_log_stop(void)
1978 {
1979     global_dirty_log = false;
1980
1981     /* Refresh DIRTY_LOG_MIGRATION bit.  */
1982     memory_region_transaction_begin();
1983     memory_region_update_pending = true;
1984     memory_region_transaction_commit();
1985
1986     MEMORY_LISTENER_CALL_GLOBAL(log_global_stop, Reverse);
1987 }
1988
1989 static void listener_add_address_space(MemoryListener *listener,
1990                                        AddressSpace *as)
1991 {
1992     FlatView *view;
1993     FlatRange *fr;
1994
1995     if (listener->address_space_filter
1996         && listener->address_space_filter != as) {
1997         return;
1998     }
1999
2000     if (global_dirty_log) {
2001         if (listener->log_global_start) {
2002             listener->log_global_start(listener);
2003         }
2004     }
2005
2006     view = address_space_get_flatview(as);
2007     FOR_EACH_FLAT_RANGE(fr, view) {
2008         MemoryRegionSection section = {
2009             .mr = fr->mr,
2010             .address_space = as,
2011             .offset_within_region = fr->offset_in_region,
2012             .size = fr->addr.size,
2013             .offset_within_address_space = int128_get64(fr->addr.start),
2014             .readonly = fr->readonly,
2015         };
2016         if (listener->region_add) {
2017             listener->region_add(listener, &section);
2018         }
2019     }
2020     flatview_unref(view);
2021 }
2022
2023 void memory_listener_register(MemoryListener *listener, AddressSpace *filter)
2024 {
2025     MemoryListener *other = NULL;
2026     AddressSpace *as;
2027
2028     listener->address_space_filter = filter;
2029     if (QTAILQ_EMPTY(&memory_listeners)
2030         || listener->priority >= QTAILQ_LAST(&memory_listeners,
2031                                              memory_listeners)->priority) {
2032         QTAILQ_INSERT_TAIL(&memory_listeners, listener, link);
2033     } else {
2034         QTAILQ_FOREACH(other, &memory_listeners, link) {
2035             if (listener->priority < other->priority) {
2036                 break;
2037             }
2038         }
2039         QTAILQ_INSERT_BEFORE(other, listener, link);
2040     }
2041
2042     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
2043         listener_add_address_space(listener, as);
2044     }
2045 }
2046
2047 void memory_listener_unregister(MemoryListener *listener)
2048 {
2049     QTAILQ_REMOVE(&memory_listeners, listener, link);
2050 }
2051
2052 void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name)
2053 {
2054     memory_region_ref(root);
2055     memory_region_transaction_begin();
2056     as->root = root;
2057     as->current_map = g_new(FlatView, 1);
2058     flatview_init(as->current_map);
2059     as->ioeventfd_nb = 0;
2060     as->ioeventfds = NULL;
2061     QTAILQ_INSERT_TAIL(&address_spaces, as, address_spaces_link);
2062     as->name = g_strdup(name ? name : "anonymous");
2063     address_space_init_dispatch(as);
2064     memory_region_update_pending |= root->enabled;
2065     memory_region_transaction_commit();
2066 }
2067
2068 static void do_address_space_destroy(AddressSpace *as)
2069 {
2070     MemoryListener *listener;
2071
2072     address_space_destroy_dispatch(as);
2073
2074     QTAILQ_FOREACH(listener, &memory_listeners, link) {
2075         assert(listener->address_space_filter != as);
2076     }
2077
2078     flatview_unref(as->current_map);
2079     g_free(as->name);
2080     g_free(as->ioeventfds);
2081     memory_region_unref(as->root);
2082 }
2083
2084 void address_space_destroy(AddressSpace *as)
2085 {
2086     MemoryRegion *root = as->root;
2087
2088     /* Flush out anything from MemoryListeners listening in on this */
2089     memory_region_transaction_begin();
2090     as->root = NULL;
2091     memory_region_transaction_commit();
2092     QTAILQ_REMOVE(&address_spaces, as, address_spaces_link);
2093     address_space_unregister(as);
2094
2095     /* At this point, as->dispatch and as->current_map are dummy
2096      * entries that the guest should never use.  Wait for the old
2097      * values to expire before freeing the data.
2098      */
2099     as->root = root;
2100     call_rcu(as, do_address_space_destroy, rcu);
2101 }
2102
2103 typedef struct MemoryRegionList MemoryRegionList;
2104
2105 struct MemoryRegionList {
2106     const MemoryRegion *mr;
2107     QTAILQ_ENTRY(MemoryRegionList) queue;
2108 };
2109
2110 typedef QTAILQ_HEAD(queue, MemoryRegionList) MemoryRegionListHead;
2111
2112 static void mtree_print_mr(fprintf_function mon_printf, void *f,
2113                            const MemoryRegion *mr, unsigned int level,
2114                            hwaddr base,
2115                            MemoryRegionListHead *alias_print_queue)
2116 {
2117     MemoryRegionList *new_ml, *ml, *next_ml;
2118     MemoryRegionListHead submr_print_queue;
2119     const MemoryRegion *submr;
2120     unsigned int i;
2121
2122     if (!mr) {
2123         return;
2124     }
2125
2126     for (i = 0; i < level; i++) {
2127         mon_printf(f, "  ");
2128     }
2129
2130     if (mr->alias) {
2131         MemoryRegionList *ml;
2132         bool found = false;
2133
2134         /* check if the alias is already in the queue */
2135         QTAILQ_FOREACH(ml, alias_print_queue, queue) {
2136             if (ml->mr == mr->alias) {
2137                 found = true;
2138             }
2139         }
2140
2141         if (!found) {
2142             ml = g_new(MemoryRegionList, 1);
2143             ml->mr = mr->alias;
2144             QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue);
2145         }
2146         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx
2147                    " (prio %d, %c%c): alias %s @%s " TARGET_FMT_plx
2148                    "-" TARGET_FMT_plx "%s\n",
2149                    base + mr->addr,
2150                    base + mr->addr
2151                    + (int128_nz(mr->size) ?
2152                       (hwaddr)int128_get64(int128_sub(mr->size,
2153                                                       int128_one())) : 0),
2154                    mr->priority,
2155                    mr->romd_mode ? 'R' : '-',
2156                    !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
2157                                                                        : '-',
2158                    memory_region_name(mr),
2159                    memory_region_name(mr->alias),
2160                    mr->alias_offset,
2161                    mr->alias_offset
2162                    + (int128_nz(mr->size) ?
2163                       (hwaddr)int128_get64(int128_sub(mr->size,
2164                                                       int128_one())) : 0),
2165                    mr->enabled ? "" : " [disabled]");
2166     } else {
2167         mon_printf(f,
2168                    TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d, %c%c): %s%s\n",
2169                    base + mr->addr,
2170                    base + mr->addr
2171                    + (int128_nz(mr->size) ?
2172                       (hwaddr)int128_get64(int128_sub(mr->size,
2173                                                       int128_one())) : 0),
2174                    mr->priority,
2175                    mr->romd_mode ? 'R' : '-',
2176                    !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
2177                                                                        : '-',
2178                    memory_region_name(mr),
2179                    mr->enabled ? "" : " [disabled]");
2180     }
2181
2182     QTAILQ_INIT(&submr_print_queue);
2183
2184     QTAILQ_FOREACH(submr, &mr->subregions, subregions_link) {
2185         new_ml = g_new(MemoryRegionList, 1);
2186         new_ml->mr = submr;
2187         QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
2188             if (new_ml->mr->addr < ml->mr->addr ||
2189                 (new_ml->mr->addr == ml->mr->addr &&
2190                  new_ml->mr->priority > ml->mr->priority)) {
2191                 QTAILQ_INSERT_BEFORE(ml, new_ml, queue);
2192                 new_ml = NULL;
2193                 break;
2194             }
2195         }
2196         if (new_ml) {
2197             QTAILQ_INSERT_TAIL(&submr_print_queue, new_ml, queue);
2198         }
2199     }
2200
2201     QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
2202         mtree_print_mr(mon_printf, f, ml->mr, level + 1, base + mr->addr,
2203                        alias_print_queue);
2204     }
2205
2206     QTAILQ_FOREACH_SAFE(ml, &submr_print_queue, queue, next_ml) {
2207         g_free(ml);
2208     }
2209 }
2210
2211 void mtree_info(fprintf_function mon_printf, void *f)
2212 {
2213     MemoryRegionListHead ml_head;
2214     MemoryRegionList *ml, *ml2;
2215     AddressSpace *as;
2216
2217     QTAILQ_INIT(&ml_head);
2218
2219     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
2220         mon_printf(f, "address-space: %s\n", as->name);
2221         mtree_print_mr(mon_printf, f, as->root, 1, 0, &ml_head);
2222         mon_printf(f, "\n");
2223     }
2224
2225     /* print aliased regions */
2226     QTAILQ_FOREACH(ml, &ml_head, queue) {
2227         mon_printf(f, "memory-region: %s\n", memory_region_name(ml->mr));
2228         mtree_print_mr(mon_printf, f, ml->mr, 1, 0, &ml_head);
2229         mon_printf(f, "\n");
2230     }
2231
2232     QTAILQ_FOREACH_SAFE(ml, &ml_head, queue, ml2) {
2233         g_free(ml);
2234     }
2235 }
2236
2237 static const TypeInfo memory_region_info = {
2238     .parent             = TYPE_OBJECT,
2239     .name               = TYPE_MEMORY_REGION,
2240     .instance_size      = sizeof(MemoryRegion),
2241     .instance_init      = memory_region_initfn,
2242     .instance_finalize  = memory_region_finalize,
2243 };
2244
2245 static void memory_register_types(void)
2246 {
2247     type_register_static(&memory_region_info);
2248 }
2249
2250 type_init(memory_register_types)