memory.c

   1 /*
   2  * Physical memory management
   3  *
   4  * Copyright 2011 Red Hat, Inc. and/or its affiliates
   5  *
   6  * Authors:
   7  *  Avi Kivity <avi@redhat.com>
   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 static unsigned memory_region_transaction_depth;
  32 static bool memory_region_update_pending;
  33 static bool ioeventfd_update_pending;
  34 static bool global_dirty_log = false;
  35
  36 static QTAILQ_HEAD(memory_listeners, MemoryListener) memory_listeners
  37     = QTAILQ_HEAD_INITIALIZER(memory_listeners);
  38
  39 static QTAILQ_HEAD(, AddressSpace) address_spaces
  40     = QTAILQ_HEAD_INITIALIZER(address_spaces);
  41
  42 typedef struct AddrRange AddrRange;
  43
  44 /*
  45  * Note that signed integers are needed for negative offsetting in aliases
  46  * (large MemoryRegion::alias_offset).
  47  */
  48 struct AddrRange {
  49     Int128 start;
  50     Int128 size;
  51 };
  52
  53 static AddrRange addrrange_make(Int128 start, Int128 size)
  54 {
  55     return (AddrRange) { start, size };
  56 }
  57
  58 static bool addrrange_equal(AddrRange r1, AddrRange r2)
  59 {
  60     return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
  61 }
  62
  63 static Int128 addrrange_end(AddrRange r)
  64 {
  65     return int128_add(r.start, r.size);
  66 }
  67
  68 static AddrRange addrrange_shift(AddrRange range, Int128 delta)
  69 {
  70     int128_addto(&range.start, delta);
  71     return range;
  72 }
  73
  74 static bool addrrange_contains(AddrRange range, Int128 addr)
  75 {
  76     return int128_ge(addr, range.start)
  77         && int128_lt(addr, addrrange_end(range));
  78 }
  79
  80 static bool addrrange_intersects(AddrRange r1, AddrRange r2)
  81 {
  82     return addrrange_contains(r1, r2.start)
  83         || addrrange_contains(r2, r1.start);
  84 }
  85
  86 static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
  87 {
  88     Int128 start = int128_max(r1.start, r2.start);
  89     Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
  90     return addrrange_make(start, int128_sub(end, start));
  91 }
  92
  93 enum ListenerDirection { Forward, Reverse };
  94
  95 static bool memory_listener_match(MemoryListener *listener,
  96                                   MemoryRegionSection *section)
  97 {
  98     return !listener->address_space_filter
  99         || listener->address_space_filter == section->address_space;
 100 }
 101
 102 #define MEMORY_LISTENER_CALL_GLOBAL(_callback, _direction, _args...)    \
 103     do {                                                                \
 104         MemoryListener *_listener;                                      \
 105                                                                         \
 106         switch (_direction) {                                           \
 107         case Forward:                                                   \
 108             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 109                 if (_listener->_callback) {                             \
 110                     _listener->_callback(_listener, ##_args);           \
 111                 }                                                       \
 112             }                                                           \
 113             break;                                                      \
 114         case Reverse:                                                   \
 115             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 116                                    memory_listeners, link) {            \
 117                 if (_listener->_callback) {                             \
 118                     _listener->_callback(_listener, ##_args);           \
 119                 }                                                       \
 120             }                                                           \
 121             break;                                                      \
 122         default:                                                        \
 123             abort();                                                    \
 124         }                                                               \
 125     } while (0)
 126
 127 #define MEMORY_LISTENER_CALL(_callback, _direction, _section, _args...) \
 128     do {                                                                \
 129         MemoryListener *_listener;                                      \
 130                                                                         \
 131         switch (_direction) {                                           \
 132         case Forward:                                                   \
 133             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 134                 if (_listener->_callback                                \
 135                     && memory_listener_match(_listener, _section)) {    \
 136                     _listener->_callback(_listener, _section, ##_args); \
 137                 }                                                       \
 138             }                                                           \
 139             break;                                                      \
 140         case Reverse:                                                   \
 141             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 142                                    memory_listeners, link) {            \
 143                 if (_listener->_callback                                \
 144                     && memory_listener_match(_listener, _section)) {    \
 145                     _listener->_callback(_listener, _section, ##_args); \
 146                 }                                                       \
 147             }                                                           \
 148             break;                                                      \
 149         default:                                                        \
 150             abort();                                                    \
 151         }                                                               \
 152     } while (0)
 153
 154 /* No need to ref/unref .mr, the FlatRange keeps it alive.  */
 155 #define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback, _args...)  \
 156     MEMORY_LISTENER_CALL(callback, dir, (&(MemoryRegionSection) {       \
 157         .mr = (fr)->mr,                                                 \
 158         .address_space = (as),                                          \
 159         .offset_within_region = (fr)->offset_in_region,                 \
 160         .size = (fr)->addr.size,                                        \
 161         .offset_within_address_space = int128_get64((fr)->addr.start),  \
 162         .readonly = (fr)->readonly,                                     \
 163               }), ##_args)
 164
 165 struct CoalescedMemoryRange {
 166     AddrRange addr;
 167     QTAILQ_ENTRY(CoalescedMemoryRange) link;
 168 };
 169
 170 struct MemoryRegionIoeventfd {
 171     AddrRange addr;
 172     bool match_data;
 173     uint64_t data;
 174     EventNotifier *e;
 175 };
 176
 177 static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
 178                                            MemoryRegionIoeventfd b)
 179 {
 180     if (int128_lt(a.addr.start, b.addr.start)) {
 181         return true;
 182     } else if (int128_gt(a.addr.start, b.addr.start)) {
 183         return false;
 184     } else if (int128_lt(a.addr.size, b.addr.size)) {
 185         return true;
 186     } else if (int128_gt(a.addr.size, b.addr.size)) {
 187         return false;
 188     } else if (a.match_data < b.match_data) {
 189         return true;
 190     } else  if (a.match_data > b.match_data) {
 191         return false;
 192     } else if (a.match_data) {
 193         if (a.data < b.data) {
 194             return true;
 195         } else if (a.data > b.data) {
 196             return false;
 197         }
 198     }
 199     if (a.e < b.e) {
 200         return true;
 201     } else if (a.e > b.e) {
 202         return false;
 203     }
 204     return false;
 205 }
 206
 207 static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
 208                                           MemoryRegionIoeventfd b)
 209 {
 210     return !memory_region_ioeventfd_before(a, b)
 211         && !memory_region_ioeventfd_before(b, a);
 212 }
 213
 214 typedef struct FlatRange FlatRange;
 215 typedef struct FlatView FlatView;
 216
 217 /* Range of memory in the global map.  Addresses are absolute. */
 218 struct FlatRange {
 219     MemoryRegion *mr;
 220     hwaddr offset_in_region;
 221     AddrRange addr;
 222     uint8_t dirty_log_mask;
 223     bool romd_mode;
 224     bool readonly;
 225 };
 226
 227 /* Flattened global view of current active memory hierarchy.  Kept in sorted
 228  * order.
 229  */
 230 struct FlatView {
 231     struct rcu_head rcu;
 232     unsigned ref;
 233     FlatRange *ranges;
 234     unsigned nr;
 235     unsigned nr_allocated;
 236 };
 237
 238 typedef struct AddressSpaceOps AddressSpaceOps;
 239
 240 #define FOR_EACH_FLAT_RANGE(var, view)          \
 241     for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
 242
 243 static bool flatrange_equal(FlatRange *a, FlatRange *b)
 244 {
 245     return a->mr == b->mr
 246         && addrrange_equal(a->addr, b->addr)
 247         && a->offset_in_region == b->offset_in_region
 248         && a->romd_mode == b->romd_mode
 249         && a->readonly == b->readonly;
 250 }
 251
 252 static void flatview_init(FlatView *view)
 253 {
 254     view->ref = 1;
 255     view->ranges = NULL;
 256     view->nr = 0;
 257     view->nr_allocated = 0;
 258 }
 259
 260 /* Insert a range into a given position.  Caller is responsible for maintaining
 261  * sorting order.
 262  */
 263 static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range)
 264 {
 265     if (view->nr == view->nr_allocated) {
 266         view->nr_allocated = MAX(2 * view->nr, 10);
 267         view->ranges = g_realloc(view->ranges,
 268                                     view->nr_allocated * sizeof(*view->ranges));
 269     }
 270     memmove(view->ranges + pos + 1, view->ranges + pos,
 271             (view->nr - pos) * sizeof(FlatRange));
 272     view->ranges[pos] = *range;
 273     memory_region_ref(range->mr);
 274     ++view->nr;
 275 }
 276
 277 static void flatview_destroy(FlatView *view)
 278 {
 279     int i;
 280
 281     for (i = 0; i < view->nr; i++) {
 282         memory_region_unref(view->ranges[i].mr);
 283     }
 284     g_free(view->ranges);
 285     g_free(view);
 286 }
 287
 288 static void flatview_ref(FlatView *view)
 289 {
 290     atomic_inc(&view->ref);
 291 }
 292
 293 static void flatview_unref(FlatView *view)
 294 {
 295     if (atomic_fetch_dec(&view->ref) == 1) {
 296         flatview_destroy(view);
 297     }
 298 }
 299
 300 static bool can_merge(FlatRange *r1, FlatRange *r2)
 301 {
 302     return int128_eq(addrrange_end(r1->addr), r2->addr.start)
 303         && r1->mr == r2->mr
 304         && int128_eq(int128_add(int128_make64(r1->offset_in_region),
 305                                 r1->addr.size),
 306                      int128_make64(r2->offset_in_region))
 307         && r1->dirty_log_mask == r2->dirty_log_mask
 308         && r1->romd_mode == r2->romd_mode
 309         && r1->readonly == r2->readonly;
 310 }
 311
 312 /* Attempt to simplify a view by merging adjacent ranges */
 313 static void flatview_simplify(FlatView *view)
 314 {
 315     unsigned i, j;
 316
 317     i = 0;
 318     while (i < view->nr) {
 319         j = i + 1;
 320         while (j < view->nr
 321                && can_merge(&view->ranges[j-1], &view->ranges[j])) {
 322             int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
 323             ++j;
 324         }
 325         ++i;
 326         memmove(&view->ranges[i], &view->ranges[j],
 327                 (view->nr - j) * sizeof(view->ranges[j]));
 328         view->nr -= j - i;
 329     }
 330 }
 331
 332 static bool memory_region_big_endian(MemoryRegion *mr)
 333 {
 334 #ifdef TARGET_WORDS_BIGENDIAN
 335     return mr->ops->endianness != DEVICE_LITTLE_ENDIAN;
 336 #else
 337     return mr->ops->endianness == DEVICE_BIG_ENDIAN;
 338 #endif
 339 }
 340
 341 static bool memory_region_wrong_endianness(MemoryRegion *mr)
 342 {
 343 #ifdef TARGET_WORDS_BIGENDIAN
 344     return mr->ops->endianness == DEVICE_LITTLE_ENDIAN;
 345 #else
 346     return mr->ops->endianness == DEVICE_BIG_ENDIAN;
 347 #endif
 348 }
 349
 350 static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size)
 351 {
 352     if (memory_region_wrong_endianness(mr)) {
 353         switch (size) {
 354         case 1:
 355             break;
 356         case 2:
 357             *data = bswap16(*data);
 358             break;
 359         case 4:
 360             *data = bswap32(*data);
 361             break;
 362         case 8:
 363             *data = bswap64(*data);
 364             break;
 365         default:
 366             abort();
 367         }
 368     }
 369 }
 370
 371 static MemTxResult memory_region_oldmmio_read_accessor(MemoryRegion *mr,
 372                                                        hwaddr addr,
 373                                                        uint64_t *value,
 374                                                        unsigned size,
 375                                                        unsigned shift,
 376                                                        uint64_t mask,
 377                                                        MemTxAttrs attrs)
 378 {
 379     uint64_t tmp;
 380
 381     tmp = mr->ops->old_mmio.read[ctz32(size)](mr->opaque, addr);
 382     trace_memory_region_ops_read(mr, addr, tmp, size);
 383     *value |= (tmp & mask) << shift;
 384     return MEMTX_OK;
 385 }
 386
 387 static MemTxResult  memory_region_read_accessor(MemoryRegion *mr,
 388                                                 hwaddr addr,
 389                                                 uint64_t *value,
 390                                                 unsigned size,
 391                                                 unsigned shift,
 392                                                 uint64_t mask,
 393                                                 MemTxAttrs attrs)
 394 {
 395     uint64_t tmp;
 396
 397     if (mr->flush_coalesced_mmio) {
 398         qemu_flush_coalesced_mmio_buffer();
 399     }
 400     tmp = mr->ops->read(mr->opaque, addr, size);
 401     trace_memory_region_ops_read(mr, addr, tmp, size);
 402     *value |= (tmp & mask) << shift;
 403     return MEMTX_OK;
 404 }
 405
 406 static MemTxResult memory_region_read_with_attrs_accessor(MemoryRegion *mr,
 407                                                           hwaddr addr,
 408                                                           uint64_t *value,
 409                                                           unsigned size,
 410                                                           unsigned shift,
 411                                                           uint64_t mask,
 412                                                           MemTxAttrs attrs)
 413 {
 414     uint64_t tmp = 0;
 415     MemTxResult r;
 416
 417     if (mr->flush_coalesced_mmio) {
 418         qemu_flush_coalesced_mmio_buffer();
 419     }
 420     r = mr->ops->read_with_attrs(mr->opaque, addr, &tmp, size, attrs);
 421     trace_memory_region_ops_read(mr, addr, tmp, size);
 422     *value |= (tmp & mask) << shift;
 423     return r;
 424 }
 425
 426 static MemTxResult memory_region_oldmmio_write_accessor(MemoryRegion *mr,
 427                                                         hwaddr addr,
 428                                                         uint64_t *value,
 429                                                         unsigned size,
 430                                                         unsigned shift,
 431                                                         uint64_t mask,
 432                                                         MemTxAttrs attrs)
 433 {
 434     uint64_t tmp;
 435
 436     tmp = (*value >> shift) & mask;
 437     trace_memory_region_ops_write(mr, addr, tmp, size);
 438     mr->ops->old_mmio.write[ctz32(size)](mr->opaque, addr, tmp);
 439     return MEMTX_OK;
 440 }
 441
 442 static MemTxResult memory_region_write_accessor(MemoryRegion *mr,
 443                                                 hwaddr addr,
 444                                                 uint64_t *value,
 445                                                 unsigned size,
 446                                                 unsigned shift,
 447                                                 uint64_t mask,
 448                                                 MemTxAttrs attrs)
 449 {
 450     uint64_t tmp;
 451
 452     if (mr->flush_coalesced_mmio) {
 453         qemu_flush_coalesced_mmio_buffer();
 454     }
 455     tmp = (*value >> shift) & mask;
 456     trace_memory_region_ops_write(mr, addr, tmp, size);
 457     mr->ops->write(mr->opaque, addr, tmp, size);
 458     return MEMTX_OK;
 459 }
 460
 461 static MemTxResult memory_region_write_with_attrs_accessor(MemoryRegion *mr,
 462                                                            hwaddr addr,
 463                                                            uint64_t *value,
 464                                                            unsigned size,
 465                                                            unsigned shift,
 466                                                            uint64_t mask,
 467                                                            MemTxAttrs attrs)
 468 {
 469     uint64_t tmp;
 470
 471     if (mr->flush_coalesced_mmio) {
 472         qemu_flush_coalesced_mmio_buffer();
 473     }
 474     tmp = (*value >> shift) & mask;
 475     trace_memory_region_ops_write(mr, addr, tmp, size);
 476     return mr->ops->write_with_attrs(mr->opaque, addr, tmp, size, attrs);
 477 }
 478
 479 static MemTxResult access_with_adjusted_size(hwaddr addr,
 480                                       uint64_t *value,
 481                                       unsigned size,
 482                                       unsigned access_size_min,
 483                                       unsigned access_size_max,
 484                                       MemTxResult (*access)(MemoryRegion *mr,
 485                                                             hwaddr addr,
 486                                                             uint64_t *value,
 487                                                             unsigned size,
 488                                                             unsigned shift,
 489                                                             uint64_t mask,
 490                                                             MemTxAttrs attrs),
 491                                       MemoryRegion *mr,
 492                                       MemTxAttrs attrs)
 493 {
 494     uint64_t access_mask;
 495     unsigned access_size;
 496     unsigned i;
 497     MemTxResult r = MEMTX_OK;
 498
 499     if (!access_size_min) {
 500         access_size_min = 1;
 501     }
 502     if (!access_size_max) {
 503         access_size_max = 4;
 504     }
 505
 506     /* FIXME: support unaligned access? */
 507     access_size = MAX(MIN(size, access_size_max), access_size_min);
 508     access_mask = -1ULL >> (64 - access_size * 8);
 509     if (memory_region_big_endian(mr)) {
 510         for (i = 0; i < size; i += access_size) {
 511             r |= access(mr, addr + i, value, access_size,
 512                         (size - access_size - i) * 8, access_mask, attrs);
 513         }
 514     } else {
 515         for (i = 0; i < size; i += access_size) {
 516             r |= access(mr, addr + i, value, access_size, i * 8,
 517                         access_mask, attrs);
 518         }
 519     }
 520     return r;
 521 }
 522
 523 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
 524 {
 525     AddressSpace *as;
 526
 527     while (mr->container) {
 528         mr = mr->container;
 529     }
 530     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 531         if (mr == as->root) {
 532             return as;
 533         }
 534     }
 535     return NULL;
 536 }
 537
 538 /* Render a memory region into the global view.  Ranges in @view obscure
 539  * ranges in @mr.
 540  */
 541 static void render_memory_region(FlatView *view,
 542                                  MemoryRegion *mr,
 543                                  Int128 base,
 544                                  AddrRange clip,
 545                                  bool readonly)
 546 {
 547     MemoryRegion *subregion;
 548     unsigned i;
 549     hwaddr offset_in_region;
 550     Int128 remain;
 551     Int128 now;
 552     FlatRange fr;
 553     AddrRange tmp;
 554
 555     if (!mr->enabled) {
 556         return;
 557     }
 558
 559     int128_addto(&base, int128_make64(mr->addr));
 560     readonly |= mr->readonly;
 561
 562     tmp = addrrange_make(base, mr->size);
 563
 564     if (!addrrange_intersects(tmp, clip)) {
 565         return;
 566     }
 567
 568     clip = addrrange_intersection(tmp, clip);
 569
 570     if (mr->alias) {
 571         int128_subfrom(&base, int128_make64(mr->alias->addr));
 572         int128_subfrom(&base, int128_make64(mr->alias_offset));
 573         render_memory_region(view, mr->alias, base, clip, readonly);
 574         return;
 575     }
 576
 577     /* Render subregions in priority order. */
 578     QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) {
 579         render_memory_region(view, subregion, base, clip, readonly);
 580     }
 581
 582     if (!mr->terminates) {
 583         return;
 584     }
 585
 586     offset_in_region = int128_get64(int128_sub(clip.start, base));
 587     base = clip.start;
 588     remain = clip.size;
 589
 590     fr.mr = mr;
 591     fr.dirty_log_mask = memory_region_get_dirty_log_mask(mr);
 592     fr.romd_mode = mr->romd_mode;
 593     fr.readonly = readonly;
 594
 595     /* Render the region itself into any gaps left by the current view. */
 596     for (i = 0; i < view->nr && int128_nz(remain); ++i) {
 597         if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
 598             continue;
 599         }
 600         if (int128_lt(base, view->ranges[i].addr.start)) {
 601             now = int128_min(remain,
 602                              int128_sub(view->ranges[i].addr.start, base));
 603             fr.offset_in_region = offset_in_region;
 604             fr.addr = addrrange_make(base, now);
 605             flatview_insert(view, i, &fr);
 606             ++i;
 607             int128_addto(&base, now);
 608             offset_in_region += int128_get64(now);
 609             int128_subfrom(&remain, now);
 610         }
 611         now = int128_sub(int128_min(int128_add(base, remain),
 612                                     addrrange_end(view->ranges[i].addr)),
 613                          base);
 614         int128_addto(&base, now);
 615         offset_in_region += int128_get64(now);
 616         int128_subfrom(&remain, now);
 617     }
 618     if (int128_nz(remain)) {
 619         fr.offset_in_region = offset_in_region;
 620         fr.addr = addrrange_make(base, remain);
 621         flatview_insert(view, i, &fr);
 622     }
 623 }
 624
 625 /* Render a memory topology into a list of disjoint absolute ranges. */
 626 static FlatView *generate_memory_topology(MemoryRegion *mr)
 627 {
 628     FlatView *view;
 629
 630     view = g_new(FlatView, 1);
 631     flatview_init(view);
 632
 633     if (mr) {
 634         render_memory_region(view, mr, int128_zero(),
 635                              addrrange_make(int128_zero(), int128_2_64()), false);
 636     }
 637     flatview_simplify(view);
 638
 639     return view;
 640 }
 641
 642 static void address_space_add_del_ioeventfds(AddressSpace *as,
 643                                              MemoryRegionIoeventfd *fds_new,
 644                                              unsigned fds_new_nb,
 645                                              MemoryRegionIoeventfd *fds_old,
 646                                              unsigned fds_old_nb)
 647 {
 648     unsigned iold, inew;
 649     MemoryRegionIoeventfd *fd;
 650     MemoryRegionSection section;
 651
 652     /* Generate a symmetric difference of the old and new fd sets, adding
 653      * and deleting as necessary.
 654      */
 655
 656     iold = inew = 0;
 657     while (iold < fds_old_nb || inew < fds_new_nb) {
 658         if (iold < fds_old_nb
 659             && (inew == fds_new_nb
 660                 || memory_region_ioeventfd_before(fds_old[iold],
 661                                                   fds_new[inew]))) {
 662             fd = &fds_old[iold];
 663             section = (MemoryRegionSection) {
 664                 .address_space = as,
 665                 .offset_within_address_space = int128_get64(fd->addr.start),
 666                 .size = fd->addr.size,
 667             };
 668             MEMORY_LISTENER_CALL(eventfd_del, Forward, &section,
 669                                  fd->match_data, fd->data, fd->e);
 670             ++iold;
 671         } else if (inew < fds_new_nb
 672                    && (iold == fds_old_nb
 673                        || memory_region_ioeventfd_before(fds_new[inew],
 674                                                          fds_old[iold]))) {
 675             fd = &fds_new[inew];
 676             section = (MemoryRegionSection) {
 677                 .address_space = as,
 678                 .offset_within_address_space = int128_get64(fd->addr.start),
 679                 .size = fd->addr.size,
 680             };
 681             MEMORY_LISTENER_CALL(eventfd_add, Reverse, &section,
 682                                  fd->match_data, fd->data, fd->e);
 683             ++inew;
 684         } else {
 685             ++iold;
 686             ++inew;
 687         }
 688     }
 689 }
 690
 691 static FlatView *address_space_get_flatview(AddressSpace *as)
 692 {
 693     FlatView *view;
 694
 695     rcu_read_lock();
 696     view = atomic_rcu_read(&as->current_map);
 697     flatview_ref(view);
 698     rcu_read_unlock();
 699     return view;
 700 }
 701
 702 static void address_space_update_ioeventfds(AddressSpace *as)
 703 {
 704     FlatView *view;
 705     FlatRange *fr;
 706     unsigned ioeventfd_nb = 0;
 707     MemoryRegionIoeventfd *ioeventfds = NULL;
 708     AddrRange tmp;
 709     unsigned i;
 710
 711     view = address_space_get_flatview(as);
 712     FOR_EACH_FLAT_RANGE(fr, view) {
 713         for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
 714             tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
 715                                   int128_sub(fr->addr.start,
 716                                              int128_make64(fr->offset_in_region)));
 717             if (addrrange_intersects(fr->addr, tmp)) {
 718                 ++ioeventfd_nb;
 719                 ioeventfds = g_realloc(ioeventfds,
 720                                           ioeventfd_nb * sizeof(*ioeventfds));
 721                 ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i];
 722                 ioeventfds[ioeventfd_nb-1].addr = tmp;
 723             }
 724         }
 725     }
 726
 727     address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb,
 728                                      as->ioeventfds, as->ioeventfd_nb);
 729
 730     g_free(as->ioeventfds);
 731     as->ioeventfds = ioeventfds;
 732     as->ioeventfd_nb = ioeventfd_nb;
 733     flatview_unref(view);
 734 }
 735
 736 static void address_space_update_topology_pass(AddressSpace *as,
 737                                                const FlatView *old_view,
 738                                                const FlatView *new_view,
 739                                                bool adding)
 740 {
 741     unsigned iold, inew;
 742     FlatRange *frold, *frnew;
 743
 744     /* Generate a symmetric difference of the old and new memory maps.
 745      * Kill ranges in the old map, and instantiate ranges in the new map.
 746      */
 747     iold = inew = 0;
 748     while (iold < old_view->nr || inew < new_view->nr) {
 749         if (iold < old_view->nr) {
 750             frold = &old_view->ranges[iold];
 751         } else {
 752             frold = NULL;
 753         }
 754         if (inew < new_view->nr) {
 755             frnew = &new_view->ranges[inew];
 756         } else {
 757             frnew = NULL;
 758         }
 759
 760         if (frold
 761             && (!frnew
 762                 || int128_lt(frold->addr.start, frnew->addr.start)
 763                 || (int128_eq(frold->addr.start, frnew->addr.start)
 764                     && !flatrange_equal(frold, frnew)))) {
 765             /* In old but not in new, or in both but attributes changed. */
 766
 767             if (!adding) {
 768                 MEMORY_LISTENER_UPDATE_REGION(frold, as, Reverse, region_del);
 769             }
 770
 771             ++iold;
 772         } else if (frold && frnew && flatrange_equal(frold, frnew)) {
 773             /* In both and unchanged (except logging may have changed) */
 774
 775             if (adding) {
 776                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_nop);
 777                 if (frnew->dirty_log_mask & ~frold->dirty_log_mask) {
 778                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, log_start,
 779                                                   frold->dirty_log_mask,
 780                                                   frnew->dirty_log_mask);
 781                 }
 782                 if (frold->dirty_log_mask & ~frnew->dirty_log_mask) {
 783                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Reverse, log_stop,
 784                                                   frold->dirty_log_mask,
 785                                                   frnew->dirty_log_mask);
 786                 }
 787             }
 788
 789             ++iold;
 790             ++inew;
 791         } else {
 792             /* In new */
 793
 794             if (adding) {
 795                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_add);
 796             }
 797
 798             ++inew;
 799         }
 800     }
 801 }
 802
 803
 804 static void address_space_update_topology(AddressSpace *as)
 805 {
 806     FlatView *old_view = address_space_get_flatview(as);
 807     FlatView *new_view = generate_memory_topology(as->root);
 808
 809     address_space_update_topology_pass(as, old_view, new_view, false);
 810     address_space_update_topology_pass(as, old_view, new_view, true);
 811
 812     /* Writes are protected by the BQL.  */
 813     atomic_rcu_set(&as->current_map, new_view);
 814     call_rcu(old_view, flatview_unref, rcu);
 815
 816     /* Note that all the old MemoryRegions are still alive up to this
 817      * point.  This relieves most MemoryListeners from the need to
 818      * ref/unref the MemoryRegions they get---unless they use them
 819      * outside the iothread mutex, in which case precise reference
 820      * counting is necessary.
 821      */
 822     flatview_unref(old_view);
 823
 824     address_space_update_ioeventfds(as);
 825 }
 826
 827 void memory_region_transaction_begin(void)
 828 {
 829     qemu_flush_coalesced_mmio_buffer();
 830     ++memory_region_transaction_depth;
 831 }
 832
 833 static void memory_region_clear_pending(void)
 834 {
 835     memory_region_update_pending = false;
 836     ioeventfd_update_pending = false;
 837 }
 838
 839 void memory_region_transaction_commit(void)
 840 {
 841     AddressSpace *as;
 842
 843     assert(memory_region_transaction_depth);
 844     --memory_region_transaction_depth;
 845     if (!memory_region_transaction_depth) {
 846         if (memory_region_update_pending) {
 847             MEMORY_LISTENER_CALL_GLOBAL(begin, Forward);
 848
 849             QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 850                 address_space_update_topology(as);
 851             }
 852
 853             MEMORY_LISTENER_CALL_GLOBAL(commit, Forward);
 854         } else if (ioeventfd_update_pending) {
 855             QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 856                 address_space_update_ioeventfds(as);
 857             }
 858         }
 859         memory_region_clear_pending();
 860    }
 861 }
 862
 863 static void memory_region_destructor_none(MemoryRegion *mr)
 864 {
 865 }
 866
 867 static void memory_region_destructor_ram(MemoryRegion *mr)
 868 {
 869     qemu_ram_free(mr->ram_addr);
 870 }
 871
 872 static void memory_region_destructor_alias(MemoryRegion *mr)
 873 {
 874     memory_region_unref(mr->alias);
 875 }
 876
 877 static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
 878 {
 879     qemu_ram_free_from_ptr(mr->ram_addr);
 880 }
 881
 882 static void memory_region_destructor_rom_device(MemoryRegion *mr)
 883 {
 884     qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
 885 }
 886
 887 static bool memory_region_need_escape(char c)
 888 {
 889     return c == '/' || c == '[' || c == '\\' || c == ']';
 890 }
 891
 892 static char *memory_region_escape_name(const char *name)
 893 {
 894     const char *p;
 895     char *escaped, *q;
 896     uint8_t c;
 897     size_t bytes = 0;
 898
 899     for (p = name; *p; p++) {
 900         bytes += memory_region_need_escape(*p) ? 4 : 1;
 901     }
 902     if (bytes == p - name) {
 903        return g_memdup(name, bytes + 1);
 904     }
 905
 906     escaped = g_malloc(bytes + 1);
 907     for (p = name, q = escaped; *p; p++) {
 908         c = *p;
 909         if (unlikely(memory_region_need_escape(c))) {
 910             *q++ = '\\';
 911             *q++ = 'x';
 912             *q++ = "0123456789abcdef"[c >> 4];
 913             c = "0123456789abcdef"[c & 15];
 914         }
 915         *q++ = c;
 916     }
 917     *q = 0;
 918     return escaped;
 919 }
 920
 921 void memory_region_init(MemoryRegion *mr,
 922                         Object *owner,
 923                         const char *name,
 924                         uint64_t size)
 925 {
 926     if (!owner) {
 927         owner = container_get(qdev_get_machine(), "/unattached");
 928     }
 929
 930     object_initialize(mr, sizeof(*mr), TYPE_MEMORY_REGION);
 931     mr->size = int128_make64(size);
 932     if (size == UINT64_MAX) {
 933         mr->size = int128_2_64();
 934     }
 935     mr->name = g_strdup(name);
 936
 937     if (name) {
 938         char *escaped_name = memory_region_escape_name(name);
 939         char *name_array = g_strdup_printf("%s[*]", escaped_name);
 940         object_property_add_child(owner, name_array, OBJECT(mr), &error_abort);
 941         object_unref(OBJECT(mr));
 942         g_free(name_array);
 943         g_free(escaped_name);
 944     }
 945 }
 946
 947 static void memory_region_get_addr(Object *obj, Visitor *v, void *opaque,
 948                                    const char *name, Error **errp)
 949 {
 950     MemoryRegion *mr = MEMORY_REGION(obj);
 951     uint64_t value = mr->addr;
 952
 953     visit_type_uint64(v, &value, name, errp);
 954 }
 955
 956 static void memory_region_get_container(Object *obj, Visitor *v, void *opaque,
 957                                         const char *name, Error **errp)
 958 {
 959     MemoryRegion *mr = MEMORY_REGION(obj);
 960     gchar *path = (gchar *)"";
 961
 962     if (mr->container) {
 963         path = object_get_canonical_path(OBJECT(mr->container));
 964     }
 965     visit_type_str(v, &path, name, errp);
 966     if (mr->container) {
 967         g_free(path);
 968     }
 969 }
 970
 971 static Object *memory_region_resolve_container(Object *obj, void *opaque,
 972                                                const char *part)
 973 {
 974     MemoryRegion *mr = MEMORY_REGION(obj);
 975
 976     return OBJECT(mr->container);
 977 }
 978
 979 static void memory_region_get_priority(Object *obj, Visitor *v, void *opaque,
 980                                        const char *name, Error **errp)
 981 {
 982     MemoryRegion *mr = MEMORY_REGION(obj);
 983     int32_t value = mr->priority;
 984
 985     visit_type_int32(v, &value, name, errp);
 986 }
 987
 988 static bool memory_region_get_may_overlap(Object *obj, Error **errp)
 989 {
 990     MemoryRegion *mr = MEMORY_REGION(obj);
 991
 992     return mr->may_overlap;
 993 }
 994
 995 static void memory_region_get_size(Object *obj, Visitor *v, void *opaque,
 996                                    const char *name, Error **errp)
 997 {
 998     MemoryRegion *mr = MEMORY_REGION(obj);
 999     uint64_t value = memory_region_size(mr);
1000
1001     visit_type_uint64(v, &value, name, errp);
1002 }
1003
1004 static void memory_region_initfn(Object *obj)
1005 {
1006     MemoryRegion *mr = MEMORY_REGION(obj);
1007     ObjectProperty *op;
1008
1009     mr->ops = &unassigned_mem_ops;
1010     mr->enabled = true;
1011     mr->romd_mode = true;
1012     mr->destructor = memory_region_destructor_none;
1013     QTAILQ_INIT(&mr->subregions);
1014     QTAILQ_INIT(&mr->coalesced);
1015
1016     op = object_property_add(OBJECT(mr), "container",
1017                              "link<" TYPE_MEMORY_REGION ">",
1018                              memory_region_get_container,
1019                              NULL, /* memory_region_set_container */
1020                              NULL, NULL, &error_abort);
1021     op->resolve = memory_region_resolve_container;
1022
1023     object_property_add(OBJECT(mr), "addr", "uint64",
1024                         memory_region_get_addr,
1025                         NULL, /* memory_region_set_addr */
1026                         NULL, NULL, &error_abort);
1027     object_property_add(OBJECT(mr), "priority", "uint32",
1028                         memory_region_get_priority,
1029                         NULL, /* memory_region_set_priority */
1030                         NULL, NULL, &error_abort);
1031     object_property_add_bool(OBJECT(mr), "may-overlap",
1032                              memory_region_get_may_overlap,
1033                              NULL, /* memory_region_set_may_overlap */
1034                              &error_abort);
1035     object_property_add(OBJECT(mr), "size", "uint64",
1036                         memory_region_get_size,
1037                         NULL, /* memory_region_set_size, */
1038                         NULL, NULL, &error_abort);
1039 }
1040
1041 static uint64_t unassigned_mem_read(void *opaque, hwaddr addr,
1042                                     unsigned size)
1043 {
1044 #ifdef DEBUG_UNASSIGNED
1045     printf("Unassigned mem read " TARGET_FMT_plx "\n", addr);
1046 #endif
1047     if (current_cpu != NULL) {
1048         cpu_unassigned_access(current_cpu, addr, false, false, 0, size);
1049     }
1050     return 0;
1051 }
1052
1053 static void unassigned_mem_write(void *opaque, hwaddr addr,
1054                                  uint64_t val, unsigned size)
1055 {
1056 #ifdef DEBUG_UNASSIGNED
1057     printf("Unassigned mem write " TARGET_FMT_plx " = 0x%"PRIx64"\n", addr, val);
1058 #endif
1059     if (current_cpu != NULL) {
1060         cpu_unassigned_access(current_cpu, addr, true, false, 0, size);
1061     }
1062 }
1063
1064 static bool unassigned_mem_accepts(void *opaque, hwaddr addr,
1065                                    unsigned size, bool is_write)
1066 {
1067     return false;
1068 }
1069
1070 const MemoryRegionOps unassigned_mem_ops = {
1071     .valid.accepts = unassigned_mem_accepts,
1072     .endianness = DEVICE_NATIVE_ENDIAN,
1073 };
1074
1075 bool memory_region_access_valid(MemoryRegion *mr,
1076                                 hwaddr addr,
1077                                 unsigned size,
1078                                 bool is_write)
1079 {
1080     int access_size_min, access_size_max;
1081     int access_size, i;
1082
1083     if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
1084         return false;
1085     }
1086
1087     if (!mr->ops->valid.accepts) {
1088         return true;
1089     }
1090
1091     access_size_min = mr->ops->valid.min_access_size;
1092     if (!mr->ops->valid.min_access_size) {
1093         access_size_min = 1;
1094     }
1095
1096     access_size_max = mr->ops->valid.max_access_size;
1097     if (!mr->ops->valid.max_access_size) {
1098         access_size_max = 4;
1099     }
1100
1101     access_size = MAX(MIN(size, access_size_max), access_size_min);
1102     for (i = 0; i < size; i += access_size) {
1103         if (!mr->ops->valid.accepts(mr->opaque, addr + i, access_size,
1104                                     is_write)) {
1105             return false;
1106         }
1107     }
1108
1109     return true;
1110 }
1111
1112 static MemTxResult memory_region_dispatch_read1(MemoryRegion *mr,
1113                                                 hwaddr addr,
1114                                                 uint64_t *pval,
1115                                                 unsigned size,
1116                                                 MemTxAttrs attrs)
1117 {
1118     *pval = 0;
1119
1120     if (mr->ops->read) {
1121         return access_with_adjusted_size(addr, pval, size,
1122                                          mr->ops->impl.min_access_size,
1123                                          mr->ops->impl.max_access_size,
1124                                          memory_region_read_accessor,
1125                                          mr, attrs);
1126     } else if (mr->ops->read_with_attrs) {
1127         return access_with_adjusted_size(addr, pval, size,
1128                                          mr->ops->impl.min_access_size,
1129                                          mr->ops->impl.max_access_size,
1130                                          memory_region_read_with_attrs_accessor,
1131                                          mr, attrs);
1132     } else {
1133         return access_with_adjusted_size(addr, pval, size, 1, 4,
1134                                          memory_region_oldmmio_read_accessor,
1135                                          mr, attrs);
1136     }
1137 }
1138
1139 MemTxResult memory_region_dispatch_read(MemoryRegion *mr,
1140                                         hwaddr addr,
1141                                         uint64_t *pval,
1142                                         unsigned size,
1143                                         MemTxAttrs attrs)
1144 {
1145     MemTxResult r;
1146
1147     if (!memory_region_access_valid(mr, addr, size, false)) {
1148         *pval = unassigned_mem_read(mr, addr, size);
1149         return MEMTX_DECODE_ERROR;
1150     }
1151
1152     r = memory_region_dispatch_read1(mr, addr, pval, size, attrs);
1153     adjust_endianness(mr, pval, size);
1154     return r;
1155 }
1156
1157 MemTxResult memory_region_dispatch_write(MemoryRegion *mr,
1158                                          hwaddr addr,
1159                                          uint64_t data,
1160                                          unsigned size,
1161                                          MemTxAttrs attrs)
1162 {
1163     if (!memory_region_access_valid(mr, addr, size, true)) {
1164         unassigned_mem_write(mr, addr, data, size);
1165         return MEMTX_DECODE_ERROR;
1166     }
1167
1168     adjust_endianness(mr, &data, size);
1169
1170     if (mr->ops->write) {
1171         return access_with_adjusted_size(addr, &data, size,
1172                                          mr->ops->impl.min_access_size,
1173                                          mr->ops->impl.max_access_size,
1174                                          memory_region_write_accessor, mr,
1175                                          attrs);
1176     } else if (mr->ops->write_with_attrs) {
1177         return
1178             access_with_adjusted_size(addr, &data, size,
1179                                       mr->ops->impl.min_access_size,
1180                                       mr->ops->impl.max_access_size,
1181                                       memory_region_write_with_attrs_accessor,
1182                                       mr, attrs);
1183     } else {
1184         return access_with_adjusted_size(addr, &data, size, 1, 4,
1185                                          memory_region_oldmmio_write_accessor,
1186                                          mr, attrs);
1187     }
1188 }
1189
1190 void memory_region_init_io(MemoryRegion *mr,
1191                            Object *owner,
1192                            const MemoryRegionOps *ops,
1193                            void *opaque,
1194                            const char *name,
1195                            uint64_t size)
1196 {
1197     memory_region_init(mr, owner, name, size);
1198     mr->ops = ops;
1199     mr->opaque = opaque;
1200     mr->terminates = true;
1201     mr->ram_addr = ~(ram_addr_t)0;
1202 }
1203
1204 void memory_region_init_ram(MemoryRegion *mr,
1205                             Object *owner,
1206                             const char *name,
1207                             uint64_t size,
1208                             Error **errp)
1209 {
1210     memory_region_init(mr, owner, name, size);
1211     mr->ram = true;
1212     mr->terminates = true;
1213     mr->destructor = memory_region_destructor_ram;
1214     mr->ram_addr = qemu_ram_alloc(size, mr, errp);
1215     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
1216 }
1217
1218 void memory_region_init_resizeable_ram(MemoryRegion *mr,
1219                                        Object *owner,
1220                                        const char *name,
1221                                        uint64_t size,
1222                                        uint64_t max_size,
1223                                        void (*resized)(const char*,
1224                                                        uint64_t length,
1225                                                        void *host),
1226                                        Error **errp)
1227 {
1228     memory_region_init(mr, owner, name, size);
1229     mr->ram = true;
1230     mr->terminates = true;
1231     mr->destructor = memory_region_destructor_ram;
1232     mr->ram_addr = qemu_ram_alloc_resizeable(size, max_size, resized, mr, errp);
1233     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
1234 }
1235
1236 #ifdef __linux__
1237 void memory_region_init_ram_from_file(MemoryRegion *mr,
1238                                       struct Object *owner,
1239                                       const char *name,
1240                                       uint64_t size,
1241                                       bool share,
1242                                       const char *path,
1243                                       Error **errp)
1244 {
1245     memory_region_init(mr, owner, name, size);
1246     mr->ram = true;
1247     mr->terminates = true;
1248     mr->destructor = memory_region_destructor_ram;
1249     mr->ram_addr = qemu_ram_alloc_from_file(size, mr, share, path, errp);
1250     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
1251 }
1252 #endif
1253
1254 void memory_region_init_ram_ptr(MemoryRegion *mr,
1255                                 Object *owner,
1256                                 const char *name,
1257                                 uint64_t size,
1258                                 void *ptr)
1259 {
1260     memory_region_init(mr, owner, name, size);
1261     mr->ram = true;
1262     mr->terminates = true;
1263     mr->destructor = memory_region_destructor_ram_from_ptr;
1264     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
1265
1266     /* qemu_ram_alloc_from_ptr cannot fail with ptr != NULL.  */
1267     assert(ptr != NULL);
1268     mr->ram_addr = qemu_ram_alloc_from_ptr(size, ptr, mr, &error_abort);
1269 }
1270
1271 void memory_region_set_skip_dump(MemoryRegion *mr)
1272 {
1273     mr->skip_dump = true;
1274 }
1275
1276 void memory_region_init_alias(MemoryRegion *mr,
1277                               Object *owner,
1278                               const char *name,
1279                               MemoryRegion *orig,
1280                               hwaddr offset,
1281                               uint64_t size)
1282 {
1283     memory_region_init(mr, owner, name, size);
1284     memory_region_ref(orig);
1285     mr->destructor = memory_region_destructor_alias;
1286     mr->alias = orig;
1287     mr->alias_offset = offset;
1288 }
1289
1290 void memory_region_init_rom_device(MemoryRegion *mr,
1291                                    Object *owner,
1292                                    const MemoryRegionOps *ops,
1293                                    void *opaque,
1294                                    const char *name,
1295                                    uint64_t size,
1296                                    Error **errp)
1297 {
1298     memory_region_init(mr, owner, name, size);
1299     mr->ops = ops;
1300     mr->opaque = opaque;
1301     mr->terminates = true;
1302     mr->rom_device = true;
1303     mr->destructor = memory_region_destructor_rom_device;
1304     mr->ram_addr = qemu_ram_alloc(size, mr, errp);
1305 }
1306
1307 void memory_region_init_iommu(MemoryRegion *mr,
1308                               Object *owner,
1309                               const MemoryRegionIOMMUOps *ops,
1310                               const char *name,
1311                               uint64_t size)
1312 {
1313     memory_region_init(mr, owner, name, size);
1314     mr->iommu_ops = ops,
1315     mr->terminates = true;  /* then re-forwards */
1316     notifier_list_init(&mr->iommu_notify);
1317 }
1318
1319 void memory_region_init_reservation(MemoryRegion *mr,
1320                                     Object *owner,
1321                                     const char *name,
1322                                     uint64_t size)
1323 {
1324     memory_region_init_io(mr, owner, &unassigned_mem_ops, mr, name, size);
1325 }
1326
1327 static void memory_region_finalize(Object *obj)
1328 {
1329     MemoryRegion *mr = MEMORY_REGION(obj);
1330
1331     assert(QTAILQ_EMPTY(&mr->subregions));
1332     mr->destructor(mr);
1333     memory_region_clear_coalescing(mr);
1334     g_free((char *)mr->name);
1335     g_free(mr->ioeventfds);
1336 }
1337
1338 Object *memory_region_owner(MemoryRegion *mr)
1339 {
1340     Object *obj = OBJECT(mr);
1341     return obj->parent;
1342 }
1343
1344 void memory_region_ref(MemoryRegion *mr)
1345 {
1346     /* MMIO callbacks most likely will access data that belongs
1347      * to the owner, hence the need to ref/unref the owner whenever
1348      * the memory region is in use.
1349      *
1350      * The memory region is a child of its owner.  As long as the
1351      * owner doesn't call unparent itself on the memory region,
1352      * ref-ing the owner will also keep the memory region alive.
1353      * Memory regions without an owner are supposed to never go away,
1354      * but we still ref/unref them for debugging purposes.
1355      */
1356     Object *obj = OBJECT(mr);
1357     if (obj && obj->parent) {
1358         object_ref(obj->parent);
1359     } else {
1360         object_ref(obj);
1361     }
1362 }
1363
1364 void memory_region_unref(MemoryRegion *mr)
1365 {
1366     Object *obj = OBJECT(mr);
1367     if (obj && obj->parent) {
1368         object_unref(obj->parent);
1369     } else {
1370         object_unref(obj);
1371     }
1372 }
1373
1374 uint64_t memory_region_size(MemoryRegion *mr)
1375 {
1376     if (int128_eq(mr->size, int128_2_64())) {
1377         return UINT64_MAX;
1378     }
1379     return int128_get64(mr->size);
1380 }
1381
1382 const char *memory_region_name(const MemoryRegion *mr)
1383 {
1384     if (!mr->name) {
1385         ((MemoryRegion *)mr)->name =
1386             object_get_canonical_path_component(OBJECT(mr));
1387     }
1388     return mr->name;
1389 }
1390
1391 bool memory_region_is_ram(MemoryRegion *mr)
1392 {
1393     return mr->ram;
1394 }
1395
1396 bool memory_region_is_skip_dump(MemoryRegion *mr)
1397 {
1398     return mr->skip_dump;
1399 }
1400
1401 uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr)
1402 {
1403     uint8_t mask = mr->dirty_log_mask;
1404     if (global_dirty_log) {
1405         mask |= (1 << DIRTY_MEMORY_MIGRATION);
1406     }
1407     return mask;
1408 }
1409
1410 bool memory_region_is_logging(MemoryRegion *mr, uint8_t client)
1411 {
1412     return memory_region_get_dirty_log_mask(mr) & (1 << client);
1413 }
1414
1415 bool memory_region_is_rom(MemoryRegion *mr)
1416 {
1417     return mr->ram && mr->readonly;
1418 }
1419
1420 bool memory_region_is_iommu(MemoryRegion *mr)
1421 {
1422     return mr->iommu_ops;
1423 }
1424
1425 void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n)
1426 {
1427     notifier_list_add(&mr->iommu_notify, n);
1428 }
1429
1430 void memory_region_unregister_iommu_notifier(Notifier *n)
1431 {
1432     notifier_remove(n);
1433 }
1434
1435 void memory_region_notify_iommu(MemoryRegion *mr,
1436                                 IOMMUTLBEntry entry)
1437 {
1438     assert(memory_region_is_iommu(mr));
1439     notifier_list_notify(&mr->iommu_notify, &entry);
1440 }
1441
1442 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
1443 {
1444     uint8_t mask = 1 << client;
1445
1446     assert(client == DIRTY_MEMORY_VGA);
1447     memory_region_transaction_begin();
1448     mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
1449     memory_region_update_pending |= mr->enabled;
1450     memory_region_transaction_commit();
1451 }
1452
1453 bool memory_region_get_dirty(MemoryRegion *mr, hwaddr addr,
1454                              hwaddr size, unsigned client)
1455 {
1456     assert(mr->terminates);
1457     return cpu_physical_memory_get_dirty(mr->ram_addr + addr, size, client);
1458 }
1459
1460 void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,
1461                              hwaddr size)
1462 {
1463     assert(mr->terminates);
1464     cpu_physical_memory_set_dirty_range(mr->ram_addr + addr, size,
1465                                         memory_region_get_dirty_log_mask(mr));
1466 }
1467
1468 bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr,
1469                                         hwaddr size, unsigned client)
1470 {
1471     bool ret;
1472     assert(mr->terminates);
1473     ret = cpu_physical_memory_get_dirty(mr->ram_addr + addr, size, client);
1474     if (ret) {
1475         cpu_physical_memory_reset_dirty(mr->ram_addr + addr, size, client);
1476     }
1477     return ret;
1478 }
1479
1480
1481 void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
1482 {
1483     AddressSpace *as;
1484     FlatRange *fr;
1485
1486     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1487         FlatView *view = address_space_get_flatview(as);
1488         FOR_EACH_FLAT_RANGE(fr, view) {
1489             if (fr->mr == mr) {
1490                 MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1491             }
1492         }
1493         flatview_unref(view);
1494     }
1495 }
1496
1497 void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
1498 {
1499     if (mr->readonly != readonly) {
1500         memory_region_transaction_begin();
1501         mr->readonly = readonly;
1502         memory_region_update_pending |= mr->enabled;
1503         memory_region_transaction_commit();
1504     }
1505 }
1506
1507 void memory_region_rom_device_set_romd(MemoryRegion *mr, bool romd_mode)
1508 {
1509     if (mr->romd_mode != romd_mode) {
1510         memory_region_transaction_begin();
1511         mr->romd_mode = romd_mode;
1512         memory_region_update_pending |= mr->enabled;
1513         memory_region_transaction_commit();
1514     }
1515 }
1516
1517 void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
1518                                hwaddr size, unsigned client)
1519 {
1520     assert(mr->terminates);
1521     cpu_physical_memory_reset_dirty(mr->ram_addr + addr, size, client);
1522 }
1523
1524 int memory_region_get_fd(MemoryRegion *mr)
1525 {
1526     if (mr->alias) {
1527         return memory_region_get_fd(mr->alias);
1528     }
1529
1530     assert(mr->terminates);
1531
1532     return qemu_get_ram_fd(mr->ram_addr & TARGET_PAGE_MASK);
1533 }
1534
1535 void *memory_region_get_ram_ptr(MemoryRegion *mr)
1536 {
1537     if (mr->alias) {
1538         return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset;
1539     }
1540
1541     assert(mr->terminates);
1542
1543     return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
1544 }
1545
1546 void memory_region_ram_resize(MemoryRegion *mr, ram_addr_t newsize, Error **errp)
1547 {
1548     assert(mr->terminates);
1549
1550     qemu_ram_resize(mr->ram_addr, newsize, errp);
1551 }
1552
1553 static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as)
1554 {
1555     FlatView *view;
1556     FlatRange *fr;
1557     CoalescedMemoryRange *cmr;
1558     AddrRange tmp;
1559     MemoryRegionSection section;
1560
1561     view = address_space_get_flatview(as);
1562     FOR_EACH_FLAT_RANGE(fr, view) {
1563         if (fr->mr == mr) {
1564             section = (MemoryRegionSection) {
1565                 .address_space = as,
1566                 .offset_within_address_space = int128_get64(fr->addr.start),
1567                 .size = fr->addr.size,
1568             };
1569
1570             MEMORY_LISTENER_CALL(coalesced_mmio_del, Reverse, &section,
1571                                  int128_get64(fr->addr.start),
1572                                  int128_get64(fr->addr.size));
1573             QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
1574                 tmp = addrrange_shift(cmr->addr,
1575                                       int128_sub(fr->addr.start,
1576                                                  int128_make64(fr->offset_in_region)));
1577                 if (!addrrange_intersects(tmp, fr->addr)) {
1578                     continue;
1579                 }
1580                 tmp = addrrange_intersection(tmp, fr->addr);
1581                 MEMORY_LISTENER_CALL(coalesced_mmio_add, Forward, &section,
1582                                      int128_get64(tmp.start),
1583                                      int128_get64(tmp.size));
1584             }
1585         }
1586     }
1587     flatview_unref(view);
1588 }
1589
1590 static void memory_region_update_coalesced_range(MemoryRegion *mr)
1591 {
1592     AddressSpace *as;
1593
1594     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1595         memory_region_update_coalesced_range_as(mr, as);
1596     }
1597 }
1598
1599 void memory_region_set_coalescing(MemoryRegion *mr)
1600 {
1601     memory_region_clear_coalescing(mr);
1602     memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
1603 }
1604
1605 void memory_region_add_coalescing(MemoryRegion *mr,
1606                                   hwaddr offset,
1607                                   uint64_t size)
1608 {
1609     CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
1610
1611     cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
1612     QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
1613     memory_region_update_coalesced_range(mr);
1614     memory_region_set_flush_coalesced(mr);
1615 }
1616
1617 void memory_region_clear_coalescing(MemoryRegion *mr)
1618 {
1619     CoalescedMemoryRange *cmr;
1620     bool updated = false;
1621
1622     qemu_flush_coalesced_mmio_buffer();
1623     mr->flush_coalesced_mmio = false;
1624
1625     while (!QTAILQ_EMPTY(&mr->coalesced)) {
1626         cmr = QTAILQ_FIRST(&mr->coalesced);
1627         QTAILQ_REMOVE(&mr->coalesced, cmr, link);
1628         g_free(cmr);
1629         updated = true;
1630     }
1631
1632     if (updated) {
1633         memory_region_update_coalesced_range(mr);
1634     }
1635 }
1636
1637 void memory_region_set_flush_coalesced(MemoryRegion *mr)
1638 {
1639     mr->flush_coalesced_mmio = true;
1640 }
1641
1642 void memory_region_clear_flush_coalesced(MemoryRegion *mr)
1643 {
1644     qemu_flush_coalesced_mmio_buffer();
1645     if (QTAILQ_EMPTY(&mr->coalesced)) {
1646         mr->flush_coalesced_mmio = false;
1647     }
1648 }
1649
1650 void memory_region_add_eventfd(MemoryRegion *mr,
1651                                hwaddr addr,
1652                                unsigned size,
1653                                bool match_data,
1654                                uint64_t data,
1655                                EventNotifier *e)
1656 {
1657     MemoryRegionIoeventfd mrfd = {
1658         .addr.start = int128_make64(addr),
1659         .addr.size = int128_make64(size),
1660         .match_data = match_data,
1661         .data = data,
1662         .e = e,
1663     };
1664     unsigned i;
1665
1666     adjust_endianness(mr, &mrfd.data, size);
1667     memory_region_transaction_begin();
1668     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1669         if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
1670             break;
1671         }
1672     }
1673     ++mr->ioeventfd_nb;
1674     mr->ioeventfds = g_realloc(mr->ioeventfds,
1675                                   sizeof(*mr->ioeventfds) * mr->ioeventfd_nb);
1676     memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i],
1677             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i));
1678     mr->ioeventfds[i] = mrfd;
1679     ioeventfd_update_pending |= mr->enabled;
1680     memory_region_transaction_commit();
1681 }
1682
1683 void memory_region_del_eventfd(MemoryRegion *mr,
1684                                hwaddr addr,
1685                                unsigned size,
1686                                bool match_data,
1687                                uint64_t data,
1688                                EventNotifier *e)
1689 {
1690     MemoryRegionIoeventfd mrfd = {
1691         .addr.start = int128_make64(addr),
1692         .addr.size = int128_make64(size),
1693         .match_data = match_data,
1694         .data = data,
1695         .e = e,
1696     };
1697     unsigned i;
1698
1699     adjust_endianness(mr, &mrfd.data, size);
1700     memory_region_transaction_begin();
1701     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1702         if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {
1703             break;
1704         }
1705     }
1706     assert(i != mr->ioeventfd_nb);
1707     memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1],
1708             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1)));
1709     --mr->ioeventfd_nb;
1710     mr->ioeventfds = g_realloc(mr->ioeventfds,
1711                                   sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1);
1712     ioeventfd_update_pending |= mr->enabled;
1713     memory_region_transaction_commit();
1714 }
1715
1716 static void memory_region_update_container_subregions(MemoryRegion *subregion)
1717 {
1718     hwaddr offset = subregion->addr;
1719     MemoryRegion *mr = subregion->container;
1720     MemoryRegion *other;
1721
1722     memory_region_transaction_begin();
1723
1724     memory_region_ref(subregion);
1725     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1726         if (subregion->may_overlap || other->may_overlap) {
1727             continue;
1728         }
1729         if (int128_ge(int128_make64(offset),
1730                       int128_add(int128_make64(other->addr), other->size))
1731             || int128_le(int128_add(int128_make64(offset), subregion->size),
1732                          int128_make64(other->addr))) {
1733             continue;
1734         }
1735 #if 0
1736         printf("warning: subregion collision %llx/%llx (%s) "
1737                "vs %llx/%llx (%s)\n",
1738                (unsigned long long)offset,
1739                (unsigned long long)int128_get64(subregion->size),
1740                subregion->name,
1741                (unsigned long long)other->addr,
1742                (unsigned long long)int128_get64(other->size),
1743                other->name);
1744 #endif
1745     }
1746     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1747         if (subregion->priority >= other->priority) {
1748             QTAILQ_INSERT_BEFORE(other, subregion, subregions_link);
1749             goto done;
1750         }
1751     }
1752     QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link);
1753 done:
1754     memory_region_update_pending |= mr->enabled && subregion->enabled;
1755     memory_region_transaction_commit();
1756 }
1757
1758 static void memory_region_add_subregion_common(MemoryRegion *mr,
1759                                                hwaddr offset,
1760                                                MemoryRegion *subregion)
1761 {
1762     assert(!subregion->container);
1763     subregion->container = mr;
1764     subregion->addr = offset;
1765     memory_region_update_container_subregions(subregion);
1766 }
1767
1768 void memory_region_add_subregion(MemoryRegion *mr,
1769                                  hwaddr offset,
1770                                  MemoryRegion *subregion)
1771 {
1772     subregion->may_overlap = false;
1773     subregion->priority = 0;
1774     memory_region_add_subregion_common(mr, offset, subregion);
1775 }
1776
1777 void memory_region_add_subregion_overlap(MemoryRegion *mr,
1778                                          hwaddr offset,
1779                                          MemoryRegion *subregion,
1780                                          int priority)
1781 {
1782     subregion->may_overlap = true;
1783     subregion->priority = priority;
1784     memory_region_add_subregion_common(mr, offset, subregion);
1785 }
1786
1787 void memory_region_del_subregion(MemoryRegion *mr,
1788                                  MemoryRegion *subregion)
1789 {
1790     memory_region_transaction_begin();
1791     assert(subregion->container == mr);
1792     subregion->container = NULL;
1793     QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
1794     memory_region_unref(subregion);
1795     memory_region_update_pending |= mr->enabled && subregion->enabled;
1796     memory_region_transaction_commit();
1797 }
1798
1799 void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
1800 {
1801     if (enabled == mr->enabled) {
1802         return;
1803     }
1804     memory_region_transaction_begin();
1805     mr->enabled = enabled;
1806     memory_region_update_pending = true;
1807     memory_region_transaction_commit();
1808 }
1809
1810 void memory_region_set_size(MemoryRegion *mr, uint64_t size)
1811 {
1812     Int128 s = int128_make64(size);
1813
1814     if (size == UINT64_MAX) {
1815         s = int128_2_64();
1816     }
1817     if (int128_eq(s, mr->size)) {
1818         return;
1819     }
1820     memory_region_transaction_begin();
1821     mr->size = s;
1822     memory_region_update_pending = true;
1823     memory_region_transaction_commit();
1824 }
1825
1826 static void memory_region_readd_subregion(MemoryRegion *mr)
1827 {
1828     MemoryRegion *container = mr->container;
1829
1830     if (container) {
1831         memory_region_transaction_begin();
1832         memory_region_ref(mr);
1833         memory_region_del_subregion(container, mr);
1834         mr->container = container;
1835         memory_region_update_container_subregions(mr);
1836         memory_region_unref(mr);
1837         memory_region_transaction_commit();
1838     }
1839 }
1840
1841 void memory_region_set_address(MemoryRegion *mr, hwaddr addr)
1842 {
1843     if (addr != mr->addr) {
1844         mr->addr = addr;
1845         memory_region_readd_subregion(mr);
1846     }
1847 }
1848
1849 void memory_region_set_alias_offset(MemoryRegion *mr, hwaddr offset)
1850 {
1851     assert(mr->alias);
1852
1853     if (offset == mr->alias_offset) {
1854         return;
1855     }
1856
1857     memory_region_transaction_begin();
1858     mr->alias_offset = offset;
1859     memory_region_update_pending |= mr->enabled;
1860     memory_region_transaction_commit();
1861 }
1862
1863 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
1864 {
1865     return mr->ram_addr;
1866 }
1867
1868 uint64_t memory_region_get_alignment(const MemoryRegion *mr)
1869 {
1870     return mr->align;
1871 }
1872
1873 static int cmp_flatrange_addr(const void *addr_, const void *fr_)
1874 {
1875     const AddrRange *addr = addr_;
1876     const FlatRange *fr = fr_;
1877
1878     if (int128_le(addrrange_end(*addr), fr->addr.start)) {
1879         return -1;
1880     } else if (int128_ge(addr->start, addrrange_end(fr->addr))) {
1881         return 1;
1882     }
1883     return 0;
1884 }
1885
1886 static FlatRange *flatview_lookup(FlatView *view, AddrRange addr)
1887 {
1888     return bsearch(&addr, view->ranges, view->nr,
1889                    sizeof(FlatRange), cmp_flatrange_addr);
1890 }
1891
1892 bool memory_region_present(MemoryRegion *container, hwaddr addr)
1893 {
1894     MemoryRegion *mr = memory_region_find(container, addr, 1).mr;
1895     if (!mr || (mr == container)) {
1896         return false;
1897     }
1898     memory_region_unref(mr);
1899     return true;
1900 }
1901
1902 bool memory_region_is_mapped(MemoryRegion *mr)
1903 {
1904     return mr->container ? true : false;
1905 }
1906
1907 MemoryRegionSection memory_region_find(MemoryRegion *mr,
1908                                        hwaddr addr, uint64_t size)
1909 {
1910     MemoryRegionSection ret = { .mr = NULL };
1911     MemoryRegion *root;
1912     AddressSpace *as;
1913     AddrRange range;
1914     FlatView *view;
1915     FlatRange *fr;
1916
1917     addr += mr->addr;
1918     for (root = mr; root->container; ) {
1919         root = root->container;
1920         addr += root->addr;
1921     }
1922
1923     as = memory_region_to_address_space(root);
1924     if (!as) {
1925         return ret;
1926     }
1927     range = addrrange_make(int128_make64(addr), int128_make64(size));
1928
1929     rcu_read_lock();
1930     view = atomic_rcu_read(&as->current_map);
1931     fr = flatview_lookup(view, range);
1932     if (!fr) {
1933         goto out;
1934     }
1935
1936     while (fr > view->ranges && addrrange_intersects(fr[-1].addr, range)) {
1937         --fr;
1938     }
1939
1940     ret.mr = fr->mr;
1941     ret.address_space = as;
1942     range = addrrange_intersection(range, fr->addr);
1943     ret.offset_within_region = fr->offset_in_region;
1944     ret.offset_within_region += int128_get64(int128_sub(range.start,
1945                                                         fr->addr.start));
1946     ret.size = range.size;
1947     ret.offset_within_address_space = int128_get64(range.start);
1948     ret.readonly = fr->readonly;
1949     memory_region_ref(ret.mr);
1950 out:
1951     rcu_read_unlock();
1952     return ret;
1953 }
1954
1955 void address_space_sync_dirty_bitmap(AddressSpace *as)
1956 {
1957     FlatView *view;
1958     FlatRange *fr;
1959
1960     view = address_space_get_flatview(as);
1961     FOR_EACH_FLAT_RANGE(fr, view) {
1962         MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1963     }
1964     flatview_unref(view);
1965 }
1966
1967 void memory_global_dirty_log_start(void)
1968 {
1969     global_dirty_log = true;
1970
1971     MEMORY_LISTENER_CALL_GLOBAL(log_global_start, Forward);
1972
1973     /* Refresh DIRTY_LOG_MIGRATION bit.  */
1974     memory_region_transaction_begin();
1975     memory_region_update_pending = true;
1976     memory_region_transaction_commit();
1977 }
1978
1979 void memory_global_dirty_log_stop(void)
1980 {
1981     global_dirty_log = false;
1982
1983     /* Refresh DIRTY_LOG_MIGRATION bit.  */
1984     memory_region_transaction_begin();
1985     memory_region_update_pending = true;
1986     memory_region_transaction_commit();
1987
1988     MEMORY_LISTENER_CALL_GLOBAL(log_global_stop, Reverse);
1989 }
1990
1991 static void listener_add_address_space(MemoryListener *listener,
1992                                        AddressSpace *as)
1993 {
1994     FlatView *view;
1995     FlatRange *fr;
1996
1997     if (listener->address_space_filter
1998         && listener->address_space_filter != as) {
1999         return;
2000     }
2001
2002     if (global_dirty_log) {
2003         if (listener->log_global_start) {
2004             listener->log_global_start(listener);
2005         }
2006     }
2007
2008     view = address_space_get_flatview(as);
2009     FOR_EACH_FLAT_RANGE(fr, view) {
2010         MemoryRegionSection section = {
2011             .mr = fr->mr,
2012             .address_space = as,
2013             .offset_within_region = fr->offset_in_region,
2014             .size = fr->addr.size,
2015             .offset_within_address_space = int128_get64(fr->addr.start),
2016             .readonly = fr->readonly,
2017         };
2018         if (listener->region_add) {
2019             listener->region_add(listener, &section);
2020         }
2021     }
2022     flatview_unref(view);
2023 }
2024
2025 void memory_listener_register(MemoryListener *listener, AddressSpace *filter)
2026 {
2027     MemoryListener *other = NULL;
2028     AddressSpace *as;
2029
2030     listener->address_space_filter = filter;
2031     if (QTAILQ_EMPTY(&memory_listeners)
2032         || listener->priority >= QTAILQ_LAST(&memory_listeners,
2033                                              memory_listeners)->priority) {
2034         QTAILQ_INSERT_TAIL(&memory_listeners, listener, link);
2035     } else {
2036         QTAILQ_FOREACH(other, &memory_listeners, link) {
2037             if (listener->priority < other->priority) {
2038                 break;
2039             }
2040         }
2041         QTAILQ_INSERT_BEFORE(other, listener, link);
2042     }
2043
2044     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
2045         listener_add_address_space(listener, as);
2046     }
2047 }
2048
2049 void memory_listener_unregister(MemoryListener *listener)
2050 {
2051     QTAILQ_REMOVE(&memory_listeners, listener, link);
2052 }
2053
2054 void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name)
2055 {
2056     memory_region_ref(root);
2057     memory_region_transaction_begin();
2058     as->root = root;
2059     as->current_map = g_new(FlatView, 1);
2060     flatview_init(as->current_map);
2061     as->ioeventfd_nb = 0;
2062     as->ioeventfds = NULL;
2063     QTAILQ_INSERT_TAIL(&address_spaces, as, address_spaces_link);
2064     as->name = g_strdup(name ? name : "anonymous");
2065     address_space_init_dispatch(as);
2066     memory_region_update_pending |= root->enabled;
2067     memory_region_transaction_commit();
2068 }
2069
2070 static void do_address_space_destroy(AddressSpace *as)
2071 {
2072     MemoryListener *listener;
2073
2074     address_space_destroy_dispatch(as);
2075
2076     QTAILQ_FOREACH(listener, &memory_listeners, link) {
2077         assert(listener->address_space_filter != as);
2078     }
2079
2080     flatview_unref(as->current_map);
2081     g_free(as->name);
2082     g_free(as->ioeventfds);
2083     memory_region_unref(as->root);
2084 }
2085
2086 void address_space_destroy(AddressSpace *as)
2087 {
2088     MemoryRegion *root = as->root;
2089
2090     /* Flush out anything from MemoryListeners listening in on this */
2091     memory_region_transaction_begin();
2092     as->root = NULL;
2093     memory_region_transaction_commit();
2094     QTAILQ_REMOVE(&address_spaces, as, address_spaces_link);
2095     address_space_unregister(as);
2096
2097     /* At this point, as->dispatch and as->current_map are dummy
2098      * entries that the guest should never use.  Wait for the old
2099      * values to expire before freeing the data.
2100      */
2101     as->root = root;
2102     call_rcu(as, do_address_space_destroy, rcu);
2103 }
2104
2105 typedef struct MemoryRegionList MemoryRegionList;
2106
2107 struct MemoryRegionList {
2108     const MemoryRegion *mr;
2109     QTAILQ_ENTRY(MemoryRegionList) queue;
2110 };
2111
2112 typedef QTAILQ_HEAD(queue, MemoryRegionList) MemoryRegionListHead;
2113
2114 static void mtree_print_mr(fprintf_function mon_printf, void *f,
2115                            const MemoryRegion *mr, unsigned int level,
2116                            hwaddr base,
2117                            MemoryRegionListHead *alias_print_queue)
2118 {
2119     MemoryRegionList *new_ml, *ml, *next_ml;
2120     MemoryRegionListHead submr_print_queue;
2121     const MemoryRegion *submr;
2122     unsigned int i;
2123
2124     if (!mr) {
2125         return;
2126     }
2127
2128     for (i = 0; i < level; i++) {
2129         mon_printf(f, "  ");
2130     }
2131
2132     if (mr->alias) {
2133         MemoryRegionList *ml;
2134         bool found = false;
2135
2136         /* check if the alias is already in the queue */
2137         QTAILQ_FOREACH(ml, alias_print_queue, queue) {
2138             if (ml->mr == mr->alias) {
2139                 found = true;
2140             }
2141         }
2142
2143         if (!found) {
2144             ml = g_new(MemoryRegionList, 1);
2145             ml->mr = mr->alias;
2146             QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue);
2147         }
2148         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx
2149                    " (prio %d, %c%c): alias %s @%s " TARGET_FMT_plx
2150                    "-" TARGET_FMT_plx "%s\n",
2151                    base + mr->addr,
2152                    base + mr->addr
2153                    + (int128_nz(mr->size) ?
2154                       (hwaddr)int128_get64(int128_sub(mr->size,
2155                                                       int128_one())) : 0),
2156                    mr->priority,
2157                    mr->romd_mode ? 'R' : '-',
2158                    !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
2159                                                                        : '-',
2160                    memory_region_name(mr),
2161                    memory_region_name(mr->alias),
2162                    mr->alias_offset,
2163                    mr->alias_offset
2164                    + (int128_nz(mr->size) ?
2165                       (hwaddr)int128_get64(int128_sub(mr->size,
2166                                                       int128_one())) : 0),
2167                    mr->enabled ? "" : " [disabled]");
2168     } else {
2169         mon_printf(f,
2170                    TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d, %c%c): %s%s\n",
2171                    base + mr->addr,
2172                    base + mr->addr
2173                    + (int128_nz(mr->size) ?
2174                       (hwaddr)int128_get64(int128_sub(mr->size,
2175                                                       int128_one())) : 0),
2176                    mr->priority,
2177                    mr->romd_mode ? 'R' : '-',
2178                    !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
2179                                                                        : '-',
2180                    memory_region_name(mr),
2181                    mr->enabled ? "" : " [disabled]");
2182     }
2183
2184     QTAILQ_INIT(&submr_print_queue);
2185
2186     QTAILQ_FOREACH(submr, &mr->subregions, subregions_link) {
2187         new_ml = g_new(MemoryRegionList, 1);
2188         new_ml->mr = submr;
2189         QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
2190             if (new_ml->mr->addr < ml->mr->addr ||
2191                 (new_ml->mr->addr == ml->mr->addr &&
2192                  new_ml->mr->priority > ml->mr->priority)) {
2193                 QTAILQ_INSERT_BEFORE(ml, new_ml, queue);
2194                 new_ml = NULL;
2195                 break;
2196             }
2197         }
2198         if (new_ml) {
2199             QTAILQ_INSERT_TAIL(&submr_print_queue, new_ml, queue);
2200         }
2201     }
2202
2203     QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
2204         mtree_print_mr(mon_printf, f, ml->mr, level + 1, base + mr->addr,
2205                        alias_print_queue);
2206     }
2207
2208     QTAILQ_FOREACH_SAFE(ml, &submr_print_queue, queue, next_ml) {
2209         g_free(ml);
2210     }
2211 }
2212
2213 void mtree_info(fprintf_function mon_printf, void *f)
2214 {
2215     MemoryRegionListHead ml_head;
2216     MemoryRegionList *ml, *ml2;
2217     AddressSpace *as;
2218
2219     QTAILQ_INIT(&ml_head);
2220
2221     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
2222         mon_printf(f, "address-space: %s\n", as->name);
2223         mtree_print_mr(mon_printf, f, as->root, 1, 0, &ml_head);
2224         mon_printf(f, "\n");
2225     }
2226
2227     /* print aliased regions */
2228     QTAILQ_FOREACH(ml, &ml_head, queue) {
2229         mon_printf(f, "memory-region: %s\n", memory_region_name(ml->mr));
2230         mtree_print_mr(mon_printf, f, ml->mr, 1, 0, &ml_head);
2231         mon_printf(f, "\n");
2232     }
2233
2234     QTAILQ_FOREACH_SAFE(ml, &ml_head, queue, ml2) {
2235         g_free(ml);
2236     }
2237 }
2238
2239 static const TypeInfo memory_region_info = {
2240     .parent             = TYPE_OBJECT,
2241     .name               = TYPE_MEMORY_REGION,
2242     .instance_size      = sizeof(MemoryRegion),
2243     .instance_init      = memory_region_initfn,
2244     .instance_finalize  = memory_region_finalize,
2245 };
2246
2247 static void memory_register_types(void)
2248 {
2249     type_register_static(&memory_region_info);
2250 }
2251
2252 type_init(memory_register_types)