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 "bitops.h"
  20 #include "kvm.h"
  21 #include <assert.h>
  22
  23 #include "exec/memory-internal.h"
  24
  25 static unsigned memory_region_transaction_depth;
  26 static bool memory_region_update_pending;
  27 static bool global_dirty_log = false;
  28
  29 static QTAILQ_HEAD(memory_listeners, MemoryListener) memory_listeners
  30     = QTAILQ_HEAD_INITIALIZER(memory_listeners);
  31
  32 static QTAILQ_HEAD(, AddressSpace) address_spaces
  33     = QTAILQ_HEAD_INITIALIZER(address_spaces);
  34
  35 typedef struct AddrRange AddrRange;
  36
  37 /*
  38  * Note using signed integers limits us to physical addresses at most
  39  * 63 bits wide.  They are needed for negative offsetting in aliases
  40  * (large MemoryRegion::alias_offset).
  41  */
  42 struct AddrRange {
  43     Int128 start;
  44     Int128 size;
  45 };
  46
  47 static AddrRange addrrange_make(Int128 start, Int128 size)
  48 {
  49     return (AddrRange) { start, size };
  50 }
  51
  52 static bool addrrange_equal(AddrRange r1, AddrRange r2)
  53 {
  54     return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
  55 }
  56
  57 static Int128 addrrange_end(AddrRange r)
  58 {
  59     return int128_add(r.start, r.size);
  60 }
  61
  62 static AddrRange addrrange_shift(AddrRange range, Int128 delta)
  63 {
  64     int128_addto(&range.start, delta);
  65     return range;
  66 }
  67
  68 static bool addrrange_contains(AddrRange range, Int128 addr)
  69 {
  70     return int128_ge(addr, range.start)
  71         && int128_lt(addr, addrrange_end(range));
  72 }
  73
  74 static bool addrrange_intersects(AddrRange r1, AddrRange r2)
  75 {
  76     return addrrange_contains(r1, r2.start)
  77         || addrrange_contains(r2, r1.start);
  78 }
  79
  80 static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
  81 {
  82     Int128 start = int128_max(r1.start, r2.start);
  83     Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
  84     return addrrange_make(start, int128_sub(end, start));
  85 }
  86
  87 enum ListenerDirection { Forward, Reverse };
  88
  89 static bool memory_listener_match(MemoryListener *listener,
  90                                   MemoryRegionSection *section)
  91 {
  92     return !listener->address_space_filter
  93         || listener->address_space_filter == section->address_space;
  94 }
  95
  96 #define MEMORY_LISTENER_CALL_GLOBAL(_callback, _direction, _args...)    \
  97     do {                                                                \
  98         MemoryListener *_listener;                                      \
  99                                                                         \
 100         switch (_direction) {                                           \
 101         case Forward:                                                   \
 102             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 103                 if (_listener->_callback) {                             \
 104                     _listener->_callback(_listener, ##_args);           \
 105                 }                                                       \
 106             }                                                           \
 107             break;                                                      \
 108         case Reverse:                                                   \
 109             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 110                                    memory_listeners, link) {            \
 111                 if (_listener->_callback) {                             \
 112                     _listener->_callback(_listener, ##_args);           \
 113                 }                                                       \
 114             }                                                           \
 115             break;                                                      \
 116         default:                                                        \
 117             abort();                                                    \
 118         }                                                               \
 119     } while (0)
 120
 121 #define MEMORY_LISTENER_CALL(_callback, _direction, _section, _args...) \
 122     do {                                                                \
 123         MemoryListener *_listener;                                      \
 124                                                                         \
 125         switch (_direction) {                                           \
 126         case Forward:                                                   \
 127             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 128                 if (_listener->_callback                                \
 129                     && memory_listener_match(_listener, _section)) {    \
 130                     _listener->_callback(_listener, _section, ##_args); \
 131                 }                                                       \
 132             }                                                           \
 133             break;                                                      \
 134         case Reverse:                                                   \
 135             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 136                                    memory_listeners, link) {            \
 137                 if (_listener->_callback                                \
 138                     && memory_listener_match(_listener, _section)) {    \
 139                     _listener->_callback(_listener, _section, ##_args); \
 140                 }                                                       \
 141             }                                                           \
 142             break;                                                      \
 143         default:                                                        \
 144             abort();                                                    \
 145         }                                                               \
 146     } while (0)
 147
 148 #define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback)            \
 149     MEMORY_LISTENER_CALL(callback, dir, (&(MemoryRegionSection) {       \
 150         .mr = (fr)->mr,                                                 \
 151         .address_space = (as),                                          \
 152         .offset_within_region = (fr)->offset_in_region,                 \
 153         .size = int128_get64((fr)->addr.size),                          \
 154         .offset_within_address_space = int128_get64((fr)->addr.start),  \
 155         .readonly = (fr)->readonly,                                     \
 156               }))
 157
 158 struct CoalescedMemoryRange {
 159     AddrRange addr;
 160     QTAILQ_ENTRY(CoalescedMemoryRange) link;
 161 };
 162
 163 struct MemoryRegionIoeventfd {
 164     AddrRange addr;
 165     bool match_data;
 166     uint64_t data;
 167     EventNotifier *e;
 168 };
 169
 170 static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
 171                                            MemoryRegionIoeventfd b)
 172 {
 173     if (int128_lt(a.addr.start, b.addr.start)) {
 174         return true;
 175     } else if (int128_gt(a.addr.start, b.addr.start)) {
 176         return false;
 177     } else if (int128_lt(a.addr.size, b.addr.size)) {
 178         return true;
 179     } else if (int128_gt(a.addr.size, b.addr.size)) {
 180         return false;
 181     } else if (a.match_data < b.match_data) {
 182         return true;
 183     } else  if (a.match_data > b.match_data) {
 184         return false;
 185     } else if (a.match_data) {
 186         if (a.data < b.data) {
 187             return true;
 188         } else if (a.data > b.data) {
 189             return false;
 190         }
 191     }
 192     if (a.e < b.e) {
 193         return true;
 194     } else if (a.e > b.e) {
 195         return false;
 196     }
 197     return false;
 198 }
 199
 200 static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
 201                                           MemoryRegionIoeventfd b)
 202 {
 203     return !memory_region_ioeventfd_before(a, b)
 204         && !memory_region_ioeventfd_before(b, a);
 205 }
 206
 207 typedef struct FlatRange FlatRange;
 208 typedef struct FlatView FlatView;
 209
 210 /* Range of memory in the global map.  Addresses are absolute. */
 211 struct FlatRange {
 212     MemoryRegion *mr;
 213     hwaddr offset_in_region;
 214     AddrRange addr;
 215     uint8_t dirty_log_mask;
 216     bool readable;
 217     bool readonly;
 218 };
 219
 220 /* Flattened global view of current active memory hierarchy.  Kept in sorted
 221  * order.
 222  */
 223 struct FlatView {
 224     FlatRange *ranges;
 225     unsigned nr;
 226     unsigned nr_allocated;
 227 };
 228
 229 typedef struct AddressSpaceOps AddressSpaceOps;
 230
 231 #define FOR_EACH_FLAT_RANGE(var, view)          \
 232     for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
 233
 234 static bool flatrange_equal(FlatRange *a, FlatRange *b)
 235 {
 236     return a->mr == b->mr
 237         && addrrange_equal(a->addr, b->addr)
 238         && a->offset_in_region == b->offset_in_region
 239         && a->readable == b->readable
 240         && a->readonly == b->readonly;
 241 }
 242
 243 static void flatview_init(FlatView *view)
 244 {
 245     view->ranges = NULL;
 246     view->nr = 0;
 247     view->nr_allocated = 0;
 248 }
 249
 250 /* Insert a range into a given position.  Caller is responsible for maintaining
 251  * sorting order.
 252  */
 253 static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range)
 254 {
 255     if (view->nr == view->nr_allocated) {
 256         view->nr_allocated = MAX(2 * view->nr, 10);
 257         view->ranges = g_realloc(view->ranges,
 258                                     view->nr_allocated * sizeof(*view->ranges));
 259     }
 260     memmove(view->ranges + pos + 1, view->ranges + pos,
 261             (view->nr - pos) * sizeof(FlatRange));
 262     view->ranges[pos] = *range;
 263     ++view->nr;
 264 }
 265
 266 static void flatview_destroy(FlatView *view)
 267 {
 268     g_free(view->ranges);
 269 }
 270
 271 static bool can_merge(FlatRange *r1, FlatRange *r2)
 272 {
 273     return int128_eq(addrrange_end(r1->addr), r2->addr.start)
 274         && r1->mr == r2->mr
 275         && int128_eq(int128_add(int128_make64(r1->offset_in_region),
 276                                 r1->addr.size),
 277                      int128_make64(r2->offset_in_region))
 278         && r1->dirty_log_mask == r2->dirty_log_mask
 279         && r1->readable == r2->readable
 280         && r1->readonly == r2->readonly;
 281 }
 282
 283 /* Attempt to simplify a view by merging ajacent ranges */
 284 static void flatview_simplify(FlatView *view)
 285 {
 286     unsigned i, j;
 287
 288     i = 0;
 289     while (i < view->nr) {
 290         j = i + 1;
 291         while (j < view->nr
 292                && can_merge(&view->ranges[j-1], &view->ranges[j])) {
 293             int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
 294             ++j;
 295         }
 296         ++i;
 297         memmove(&view->ranges[i], &view->ranges[j],
 298                 (view->nr - j) * sizeof(view->ranges[j]));
 299         view->nr -= j - i;
 300     }
 301 }
 302
 303 static void memory_region_read_accessor(void *opaque,
 304                                         hwaddr addr,
 305                                         uint64_t *value,
 306                                         unsigned size,
 307                                         unsigned shift,
 308                                         uint64_t mask)
 309 {
 310     MemoryRegion *mr = opaque;
 311     uint64_t tmp;
 312
 313     if (mr->flush_coalesced_mmio) {
 314         qemu_flush_coalesced_mmio_buffer();
 315     }
 316     tmp = mr->ops->read(mr->opaque, addr, size);
 317     *value |= (tmp & mask) << shift;
 318 }
 319
 320 static void memory_region_write_accessor(void *opaque,
 321                                          hwaddr addr,
 322                                          uint64_t *value,
 323                                          unsigned size,
 324                                          unsigned shift,
 325                                          uint64_t mask)
 326 {
 327     MemoryRegion *mr = opaque;
 328     uint64_t tmp;
 329
 330     if (mr->flush_coalesced_mmio) {
 331         qemu_flush_coalesced_mmio_buffer();
 332     }
 333     tmp = (*value >> shift) & mask;
 334     mr->ops->write(mr->opaque, addr, tmp, size);
 335 }
 336
 337 static void access_with_adjusted_size(hwaddr addr,
 338                                       uint64_t *value,
 339                                       unsigned size,
 340                                       unsigned access_size_min,
 341                                       unsigned access_size_max,
 342                                       void (*access)(void *opaque,
 343                                                      hwaddr addr,
 344                                                      uint64_t *value,
 345                                                      unsigned size,
 346                                                      unsigned shift,
 347                                                      uint64_t mask),
 348                                       void *opaque)
 349 {
 350     uint64_t access_mask;
 351     unsigned access_size;
 352     unsigned i;
 353
 354     if (!access_size_min) {
 355         access_size_min = 1;
 356     }
 357     if (!access_size_max) {
 358         access_size_max = 4;
 359     }
 360     access_size = MAX(MIN(size, access_size_max), access_size_min);
 361     access_mask = -1ULL >> (64 - access_size * 8);
 362     for (i = 0; i < size; i += access_size) {
 363         /* FIXME: big-endian support */
 364         access(opaque, addr + i, value, access_size, i * 8, access_mask);
 365     }
 366 }
 367
 368 static const MemoryRegionPortio *find_portio(MemoryRegion *mr, uint64_t offset,
 369                                              unsigned width, bool write)
 370 {
 371     const MemoryRegionPortio *mrp;
 372
 373     for (mrp = mr->ops->old_portio; mrp->size; ++mrp) {
 374         if (offset >= mrp->offset && offset < mrp->offset + mrp->len
 375             && width == mrp->size
 376             && (write ? (bool)mrp->write : (bool)mrp->read)) {
 377             return mrp;
 378         }
 379     }
 380     return NULL;
 381 }
 382
 383 static void memory_region_iorange_read(IORange *iorange,
 384                                        uint64_t offset,
 385                                        unsigned width,
 386                                        uint64_t *data)
 387 {
 388     MemoryRegionIORange *mrio
 389         = container_of(iorange, MemoryRegionIORange, iorange);
 390     MemoryRegion *mr = mrio->mr;
 391
 392     offset += mrio->offset;
 393     if (mr->ops->old_portio) {
 394         const MemoryRegionPortio *mrp = find_portio(mr, offset - mrio->offset,
 395                                                     width, false);
 396
 397         *data = ((uint64_t)1 << (width * 8)) - 1;
 398         if (mrp) {
 399             *data = mrp->read(mr->opaque, offset);
 400         } else if (width == 2) {
 401             mrp = find_portio(mr, offset - mrio->offset, 1, false);
 402             assert(mrp);
 403             *data = mrp->read(mr->opaque, offset) |
 404                     (mrp->read(mr->opaque, offset + 1) << 8);
 405         }
 406         return;
 407     }
 408     *data = 0;
 409     access_with_adjusted_size(offset, data, width,
 410                               mr->ops->impl.min_access_size,
 411                               mr->ops->impl.max_access_size,
 412                               memory_region_read_accessor, mr);
 413 }
 414
 415 static void memory_region_iorange_write(IORange *iorange,
 416                                         uint64_t offset,
 417                                         unsigned width,
 418                                         uint64_t data)
 419 {
 420     MemoryRegionIORange *mrio
 421         = container_of(iorange, MemoryRegionIORange, iorange);
 422     MemoryRegion *mr = mrio->mr;
 423
 424     offset += mrio->offset;
 425     if (mr->ops->old_portio) {
 426         const MemoryRegionPortio *mrp = find_portio(mr, offset - mrio->offset,
 427                                                     width, true);
 428
 429         if (mrp) {
 430             mrp->write(mr->opaque, offset, data);
 431         } else if (width == 2) {
 432             mrp = find_portio(mr, offset - mrio->offset, 1, true);
 433             assert(mrp);
 434             mrp->write(mr->opaque, offset, data & 0xff);
 435             mrp->write(mr->opaque, offset + 1, data >> 8);
 436         }
 437         return;
 438     }
 439     access_with_adjusted_size(offset, &data, width,
 440                               mr->ops->impl.min_access_size,
 441                               mr->ops->impl.max_access_size,
 442                               memory_region_write_accessor, mr);
 443 }
 444
 445 static void memory_region_iorange_destructor(IORange *iorange)
 446 {
 447     g_free(container_of(iorange, MemoryRegionIORange, iorange));
 448 }
 449
 450 const IORangeOps memory_region_iorange_ops = {
 451     .read = memory_region_iorange_read,
 452     .write = memory_region_iorange_write,
 453     .destructor = memory_region_iorange_destructor,
 454 };
 455
 456 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
 457 {
 458     AddressSpace *as;
 459
 460     while (mr->parent) {
 461         mr = mr->parent;
 462     }
 463     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 464         if (mr == as->root) {
 465             return as;
 466         }
 467     }
 468     abort();
 469 }
 470
 471 /* Render a memory region into the global view.  Ranges in @view obscure
 472  * ranges in @mr.
 473  */
 474 static void render_memory_region(FlatView *view,
 475                                  MemoryRegion *mr,
 476                                  Int128 base,
 477                                  AddrRange clip,
 478                                  bool readonly)
 479 {
 480     MemoryRegion *subregion;
 481     unsigned i;
 482     hwaddr offset_in_region;
 483     Int128 remain;
 484     Int128 now;
 485     FlatRange fr;
 486     AddrRange tmp;
 487
 488     if (!mr->enabled) {
 489         return;
 490     }
 491
 492     int128_addto(&base, int128_make64(mr->addr));
 493     readonly |= mr->readonly;
 494
 495     tmp = addrrange_make(base, mr->size);
 496
 497     if (!addrrange_intersects(tmp, clip)) {
 498         return;
 499     }
 500
 501     clip = addrrange_intersection(tmp, clip);
 502
 503     if (mr->alias) {
 504         int128_subfrom(&base, int128_make64(mr->alias->addr));
 505         int128_subfrom(&base, int128_make64(mr->alias_offset));
 506         render_memory_region(view, mr->alias, base, clip, readonly);
 507         return;
 508     }
 509
 510     /* Render subregions in priority order. */
 511     QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) {
 512         render_memory_region(view, subregion, base, clip, readonly);
 513     }
 514
 515     if (!mr->terminates) {
 516         return;
 517     }
 518
 519     offset_in_region = int128_get64(int128_sub(clip.start, base));
 520     base = clip.start;
 521     remain = clip.size;
 522
 523     /* Render the region itself into any gaps left by the current view. */
 524     for (i = 0; i < view->nr && int128_nz(remain); ++i) {
 525         if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
 526             continue;
 527         }
 528         if (int128_lt(base, view->ranges[i].addr.start)) {
 529             now = int128_min(remain,
 530                              int128_sub(view->ranges[i].addr.start, base));
 531             fr.mr = mr;
 532             fr.offset_in_region = offset_in_region;
 533             fr.addr = addrrange_make(base, now);
 534             fr.dirty_log_mask = mr->dirty_log_mask;
 535             fr.readable = mr->readable;
 536             fr.readonly = readonly;
 537             flatview_insert(view, i, &fr);
 538             ++i;
 539             int128_addto(&base, now);
 540             offset_in_region += int128_get64(now);
 541             int128_subfrom(&remain, now);
 542         }
 543         now = int128_sub(int128_min(int128_add(base, remain),
 544                                     addrrange_end(view->ranges[i].addr)),
 545                          base);
 546         int128_addto(&base, now);
 547         offset_in_region += int128_get64(now);
 548         int128_subfrom(&remain, now);
 549     }
 550     if (int128_nz(remain)) {
 551         fr.mr = mr;
 552         fr.offset_in_region = offset_in_region;
 553         fr.addr = addrrange_make(base, remain);
 554         fr.dirty_log_mask = mr->dirty_log_mask;
 555         fr.readable = mr->readable;
 556         fr.readonly = readonly;
 557         flatview_insert(view, i, &fr);
 558     }
 559 }
 560
 561 /* Render a memory topology into a list of disjoint absolute ranges. */
 562 static FlatView generate_memory_topology(MemoryRegion *mr)
 563 {
 564     FlatView view;
 565
 566     flatview_init(&view);
 567
 568     if (mr) {
 569         render_memory_region(&view, mr, int128_zero(),
 570                              addrrange_make(int128_zero(), int128_2_64()), false);
 571     }
 572     flatview_simplify(&view);
 573
 574     return view;
 575 }
 576
 577 static void address_space_add_del_ioeventfds(AddressSpace *as,
 578                                              MemoryRegionIoeventfd *fds_new,
 579                                              unsigned fds_new_nb,
 580                                              MemoryRegionIoeventfd *fds_old,
 581                                              unsigned fds_old_nb)
 582 {
 583     unsigned iold, inew;
 584     MemoryRegionIoeventfd *fd;
 585     MemoryRegionSection section;
 586
 587     /* Generate a symmetric difference of the old and new fd sets, adding
 588      * and deleting as necessary.
 589      */
 590
 591     iold = inew = 0;
 592     while (iold < fds_old_nb || inew < fds_new_nb) {
 593         if (iold < fds_old_nb
 594             && (inew == fds_new_nb
 595                 || memory_region_ioeventfd_before(fds_old[iold],
 596                                                   fds_new[inew]))) {
 597             fd = &fds_old[iold];
 598             section = (MemoryRegionSection) {
 599                 .address_space = as,
 600                 .offset_within_address_space = int128_get64(fd->addr.start),
 601                 .size = int128_get64(fd->addr.size),
 602             };
 603             MEMORY_LISTENER_CALL(eventfd_del, Forward, &section,
 604                                  fd->match_data, fd->data, fd->e);
 605             ++iold;
 606         } else if (inew < fds_new_nb
 607                    && (iold == fds_old_nb
 608                        || memory_region_ioeventfd_before(fds_new[inew],
 609                                                          fds_old[iold]))) {
 610             fd = &fds_new[inew];
 611             section = (MemoryRegionSection) {
 612                 .address_space = as,
 613                 .offset_within_address_space = int128_get64(fd->addr.start),
 614                 .size = int128_get64(fd->addr.size),
 615             };
 616             MEMORY_LISTENER_CALL(eventfd_add, Reverse, &section,
 617                                  fd->match_data, fd->data, fd->e);
 618             ++inew;
 619         } else {
 620             ++iold;
 621             ++inew;
 622         }
 623     }
 624 }
 625
 626 static void address_space_update_ioeventfds(AddressSpace *as)
 627 {
 628     FlatRange *fr;
 629     unsigned ioeventfd_nb = 0;
 630     MemoryRegionIoeventfd *ioeventfds = NULL;
 631     AddrRange tmp;
 632     unsigned i;
 633
 634     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
 635         for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
 636             tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
 637                                   int128_sub(fr->addr.start,
 638                                              int128_make64(fr->offset_in_region)));
 639             if (addrrange_intersects(fr->addr, tmp)) {
 640                 ++ioeventfd_nb;
 641                 ioeventfds = g_realloc(ioeventfds,
 642                                           ioeventfd_nb * sizeof(*ioeventfds));
 643                 ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i];
 644                 ioeventfds[ioeventfd_nb-1].addr = tmp;
 645             }
 646         }
 647     }
 648
 649     address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb,
 650                                      as->ioeventfds, as->ioeventfd_nb);
 651
 652     g_free(as->ioeventfds);
 653     as->ioeventfds = ioeventfds;
 654     as->ioeventfd_nb = ioeventfd_nb;
 655 }
 656
 657 static void address_space_update_topology_pass(AddressSpace *as,
 658                                                FlatView old_view,
 659                                                FlatView new_view,
 660                                                bool adding)
 661 {
 662     unsigned iold, inew;
 663     FlatRange *frold, *frnew;
 664
 665     /* Generate a symmetric difference of the old and new memory maps.
 666      * Kill ranges in the old map, and instantiate ranges in the new map.
 667      */
 668     iold = inew = 0;
 669     while (iold < old_view.nr || inew < new_view.nr) {
 670         if (iold < old_view.nr) {
 671             frold = &old_view.ranges[iold];
 672         } else {
 673             frold = NULL;
 674         }
 675         if (inew < new_view.nr) {
 676             frnew = &new_view.ranges[inew];
 677         } else {
 678             frnew = NULL;
 679         }
 680
 681         if (frold
 682             && (!frnew
 683                 || int128_lt(frold->addr.start, frnew->addr.start)
 684                 || (int128_eq(frold->addr.start, frnew->addr.start)
 685                     && !flatrange_equal(frold, frnew)))) {
 686             /* In old, but (not in new, or in new but attributes changed). */
 687
 688             if (!adding) {
 689                 MEMORY_LISTENER_UPDATE_REGION(frold, as, Reverse, region_del);
 690             }
 691
 692             ++iold;
 693         } else if (frold && frnew && flatrange_equal(frold, frnew)) {
 694             /* In both (logging may have changed) */
 695
 696             if (adding) {
 697                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_nop);
 698                 if (frold->dirty_log_mask && !frnew->dirty_log_mask) {
 699                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Reverse, log_stop);
 700                 } else if (frnew->dirty_log_mask && !frold->dirty_log_mask) {
 701                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, log_start);
 702                 }
 703             }
 704
 705             ++iold;
 706             ++inew;
 707         } else {
 708             /* In new */
 709
 710             if (adding) {
 711                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_add);
 712             }
 713
 714             ++inew;
 715         }
 716     }
 717 }
 718
 719
 720 static void address_space_update_topology(AddressSpace *as)
 721 {
 722     FlatView old_view = *as->current_map;
 723     FlatView new_view = generate_memory_topology(as->root);
 724
 725     address_space_update_topology_pass(as, old_view, new_view, false);
 726     address_space_update_topology_pass(as, old_view, new_view, true);
 727
 728     *as->current_map = new_view;
 729     flatview_destroy(&old_view);
 730     address_space_update_ioeventfds(as);
 731 }
 732
 733 void memory_region_transaction_begin(void)
 734 {
 735     qemu_flush_coalesced_mmio_buffer();
 736     ++memory_region_transaction_depth;
 737 }
 738
 739 void memory_region_transaction_commit(void)
 740 {
 741     AddressSpace *as;
 742
 743     assert(memory_region_transaction_depth);
 744     --memory_region_transaction_depth;
 745     if (!memory_region_transaction_depth && memory_region_update_pending) {
 746         memory_region_update_pending = false;
 747         MEMORY_LISTENER_CALL_GLOBAL(begin, Forward);
 748
 749         QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 750             address_space_update_topology(as);
 751         }
 752
 753         MEMORY_LISTENER_CALL_GLOBAL(commit, Forward);
 754     }
 755 }
 756
 757 static void memory_region_destructor_none(MemoryRegion *mr)
 758 {
 759 }
 760
 761 static void memory_region_destructor_ram(MemoryRegion *mr)
 762 {
 763     qemu_ram_free(mr->ram_addr);
 764 }
 765
 766 static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
 767 {
 768     qemu_ram_free_from_ptr(mr->ram_addr);
 769 }
 770
 771 static void memory_region_destructor_iomem(MemoryRegion *mr)
 772 {
 773 }
 774
 775 static void memory_region_destructor_rom_device(MemoryRegion *mr)
 776 {
 777     qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
 778 }
 779
 780 static bool memory_region_wrong_endianness(MemoryRegion *mr)
 781 {
 782 #ifdef TARGET_WORDS_BIGENDIAN
 783     return mr->ops->endianness == DEVICE_LITTLE_ENDIAN;
 784 #else
 785     return mr->ops->endianness == DEVICE_BIG_ENDIAN;
 786 #endif
 787 }
 788
 789 void memory_region_init(MemoryRegion *mr,
 790                         const char *name,
 791                         uint64_t size)
 792 {
 793     mr->ops = NULL;
 794     mr->parent = NULL;
 795     mr->size = int128_make64(size);
 796     if (size == UINT64_MAX) {
 797         mr->size = int128_2_64();
 798     }
 799     mr->addr = 0;
 800     mr->subpage = false;
 801     mr->enabled = true;
 802     mr->terminates = false;
 803     mr->ram = false;
 804     mr->readable = true;
 805     mr->readonly = false;
 806     mr->rom_device = false;
 807     mr->destructor = memory_region_destructor_none;
 808     mr->priority = 0;
 809     mr->may_overlap = false;
 810     mr->alias = NULL;
 811     QTAILQ_INIT(&mr->subregions);
 812     memset(&mr->subregions_link, 0, sizeof mr->subregions_link);
 813     QTAILQ_INIT(&mr->coalesced);
 814     mr->name = g_strdup(name);
 815     mr->dirty_log_mask = 0;
 816     mr->ioeventfd_nb = 0;
 817     mr->ioeventfds = NULL;
 818     mr->flush_coalesced_mmio = false;
 819 }
 820
 821 static bool memory_region_access_valid(MemoryRegion *mr,
 822                                        hwaddr addr,
 823                                        unsigned size,
 824                                        bool is_write)
 825 {
 826     if (mr->ops->valid.accepts
 827         && !mr->ops->valid.accepts(mr->opaque, addr, size, is_write)) {
 828         return false;
 829     }
 830
 831     if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
 832         return false;
 833     }
 834
 835     /* Treat zero as compatibility all valid */
 836     if (!mr->ops->valid.max_access_size) {
 837         return true;
 838     }
 839
 840     if (size > mr->ops->valid.max_access_size
 841         || size < mr->ops->valid.min_access_size) {
 842         return false;
 843     }
 844     return true;
 845 }
 846
 847 static uint64_t memory_region_dispatch_read1(MemoryRegion *mr,
 848                                              hwaddr addr,
 849                                              unsigned size)
 850 {
 851     uint64_t data = 0;
 852
 853     if (!memory_region_access_valid(mr, addr, size, false)) {
 854         return -1U; /* FIXME: better signalling */
 855     }
 856
 857     if (!mr->ops->read) {
 858         return mr->ops->old_mmio.read[bitops_ffsl(size)](mr->opaque, addr);
 859     }
 860
 861     /* FIXME: support unaligned access */
 862     access_with_adjusted_size(addr, &data, size,
 863                               mr->ops->impl.min_access_size,
 864                               mr->ops->impl.max_access_size,
 865                               memory_region_read_accessor, mr);
 866
 867     return data;
 868 }
 869
 870 static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size)
 871 {
 872     if (memory_region_wrong_endianness(mr)) {
 873         switch (size) {
 874         case 1:
 875             break;
 876         case 2:
 877             *data = bswap16(*data);
 878             break;
 879         case 4:
 880             *data = bswap32(*data);
 881             break;
 882         default:
 883             abort();
 884         }
 885     }
 886 }
 887
 888 static uint64_t memory_region_dispatch_read(MemoryRegion *mr,
 889                                             hwaddr addr,
 890                                             unsigned size)
 891 {
 892     uint64_t ret;
 893
 894     ret = memory_region_dispatch_read1(mr, addr, size);
 895     adjust_endianness(mr, &ret, size);
 896     return ret;
 897 }
 898
 899 static void memory_region_dispatch_write(MemoryRegion *mr,
 900                                          hwaddr addr,
 901                                          uint64_t data,
 902                                          unsigned size)
 903 {
 904     if (!memory_region_access_valid(mr, addr, size, true)) {
 905         return; /* FIXME: better signalling */
 906     }
 907
 908     adjust_endianness(mr, &data, size);
 909
 910     if (!mr->ops->write) {
 911         mr->ops->old_mmio.write[bitops_ffsl(size)](mr->opaque, addr, data);
 912         return;
 913     }
 914
 915     /* FIXME: support unaligned access */
 916     access_with_adjusted_size(addr, &data, size,
 917                               mr->ops->impl.min_access_size,
 918                               mr->ops->impl.max_access_size,
 919                               memory_region_write_accessor, mr);
 920 }
 921
 922 void memory_region_init_io(MemoryRegion *mr,
 923                            const MemoryRegionOps *ops,
 924                            void *opaque,
 925                            const char *name,
 926                            uint64_t size)
 927 {
 928     memory_region_init(mr, name, size);
 929     mr->ops = ops;
 930     mr->opaque = opaque;
 931     mr->terminates = true;
 932     mr->destructor = memory_region_destructor_iomem;
 933     mr->ram_addr = ~(ram_addr_t)0;
 934 }
 935
 936 void memory_region_init_ram(MemoryRegion *mr,
 937                             const char *name,
 938                             uint64_t size)
 939 {
 940     memory_region_init(mr, name, size);
 941     mr->ram = true;
 942     mr->terminates = true;
 943     mr->destructor = memory_region_destructor_ram;
 944     mr->ram_addr = qemu_ram_alloc(size, mr);
 945 }
 946
 947 void memory_region_init_ram_ptr(MemoryRegion *mr,
 948                                 const char *name,
 949                                 uint64_t size,
 950                                 void *ptr)
 951 {
 952     memory_region_init(mr, name, size);
 953     mr->ram = true;
 954     mr->terminates = true;
 955     mr->destructor = memory_region_destructor_ram_from_ptr;
 956     mr->ram_addr = qemu_ram_alloc_from_ptr(size, ptr, mr);
 957 }
 958
 959 void memory_region_init_alias(MemoryRegion *mr,
 960                               const char *name,
 961                               MemoryRegion *orig,
 962                               hwaddr offset,
 963                               uint64_t size)
 964 {
 965     memory_region_init(mr, name, size);
 966     mr->alias = orig;
 967     mr->alias_offset = offset;
 968 }
 969
 970 void memory_region_init_rom_device(MemoryRegion *mr,
 971                                    const MemoryRegionOps *ops,
 972                                    void *opaque,
 973                                    const char *name,
 974                                    uint64_t size)
 975 {
 976     memory_region_init(mr, name, size);
 977     mr->ops = ops;
 978     mr->opaque = opaque;
 979     mr->terminates = true;
 980     mr->rom_device = true;
 981     mr->destructor = memory_region_destructor_rom_device;
 982     mr->ram_addr = qemu_ram_alloc(size, mr);
 983 }
 984
 985 static uint64_t invalid_read(void *opaque, hwaddr addr,
 986                              unsigned size)
 987 {
 988     MemoryRegion *mr = opaque;
 989
 990     if (!mr->warning_printed) {
 991         fprintf(stderr, "Invalid read from memory region %s\n", mr->name);
 992         mr->warning_printed = true;
 993     }
 994     return -1U;
 995 }
 996
 997 static void invalid_write(void *opaque, hwaddr addr, uint64_t data,
 998                           unsigned size)
 999 {
1000     MemoryRegion *mr = opaque;
1001
1002     if (!mr->warning_printed) {
1003         fprintf(stderr, "Invalid write to memory region %s\n", mr->name);
1004         mr->warning_printed = true;
1005     }
1006 }
1007
1008 static const MemoryRegionOps reservation_ops = {
1009     .read = invalid_read,
1010     .write = invalid_write,
1011     .endianness = DEVICE_NATIVE_ENDIAN,
1012 };
1013
1014 void memory_region_init_reservation(MemoryRegion *mr,
1015                                     const char *name,
1016                                     uint64_t size)
1017 {
1018     memory_region_init_io(mr, &reservation_ops, mr, name, size);
1019 }
1020
1021 void memory_region_destroy(MemoryRegion *mr)
1022 {
1023     assert(QTAILQ_EMPTY(&mr->subregions));
1024     assert(memory_region_transaction_depth == 0);
1025     mr->destructor(mr);
1026     memory_region_clear_coalescing(mr);
1027     g_free((char *)mr->name);
1028     g_free(mr->ioeventfds);
1029 }
1030
1031 uint64_t memory_region_size(MemoryRegion *mr)
1032 {
1033     if (int128_eq(mr->size, int128_2_64())) {
1034         return UINT64_MAX;
1035     }
1036     return int128_get64(mr->size);
1037 }
1038
1039 const char *memory_region_name(MemoryRegion *mr)
1040 {
1041     return mr->name;
1042 }
1043
1044 bool memory_region_is_ram(MemoryRegion *mr)
1045 {
1046     return mr->ram;
1047 }
1048
1049 bool memory_region_is_logging(MemoryRegion *mr)
1050 {
1051     return mr->dirty_log_mask;
1052 }
1053
1054 bool memory_region_is_rom(MemoryRegion *mr)
1055 {
1056     return mr->ram && mr->readonly;
1057 }
1058
1059 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
1060 {
1061     uint8_t mask = 1 << client;
1062
1063     memory_region_transaction_begin();
1064     mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
1065     memory_region_update_pending |= mr->enabled;
1066     memory_region_transaction_commit();
1067 }
1068
1069 bool memory_region_get_dirty(MemoryRegion *mr, hwaddr addr,
1070                              hwaddr size, unsigned client)
1071 {
1072     assert(mr->terminates);
1073     return cpu_physical_memory_get_dirty(mr->ram_addr + addr, size,
1074                                          1 << client);
1075 }
1076
1077 void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,
1078                              hwaddr size)
1079 {
1080     assert(mr->terminates);
1081     return cpu_physical_memory_set_dirty_range(mr->ram_addr + addr, size, -1);
1082 }
1083
1084 void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
1085 {
1086     AddressSpace *as;
1087     FlatRange *fr;
1088
1089     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1090         FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1091             if (fr->mr == mr) {
1092                 MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1093             }
1094         }
1095     }
1096 }
1097
1098 void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
1099 {
1100     if (mr->readonly != readonly) {
1101         memory_region_transaction_begin();
1102         mr->readonly = readonly;
1103         memory_region_update_pending |= mr->enabled;
1104         memory_region_transaction_commit();
1105     }
1106 }
1107
1108 void memory_region_rom_device_set_readable(MemoryRegion *mr, bool readable)
1109 {
1110     if (mr->readable != readable) {
1111         memory_region_transaction_begin();
1112         mr->readable = readable;
1113         memory_region_update_pending |= mr->enabled;
1114         memory_region_transaction_commit();
1115     }
1116 }
1117
1118 void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
1119                                hwaddr size, unsigned client)
1120 {
1121     assert(mr->terminates);
1122     cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
1123                                     mr->ram_addr + addr + size,
1124                                     1 << client);
1125 }
1126
1127 void *memory_region_get_ram_ptr(MemoryRegion *mr)
1128 {
1129     if (mr->alias) {
1130         return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset;
1131     }
1132
1133     assert(mr->terminates);
1134
1135     return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
1136 }
1137
1138 static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as)
1139 {
1140     FlatRange *fr;
1141     CoalescedMemoryRange *cmr;
1142     AddrRange tmp;
1143     MemoryRegionSection section;
1144
1145     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1146         if (fr->mr == mr) {
1147             section = (MemoryRegionSection) {
1148                 .address_space = as,
1149                 .offset_within_address_space = int128_get64(fr->addr.start),
1150                 .size = int128_get64(fr->addr.size),
1151             };
1152
1153             MEMORY_LISTENER_CALL(coalesced_mmio_del, Reverse, &section,
1154                                  int128_get64(fr->addr.start),
1155                                  int128_get64(fr->addr.size));
1156             QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
1157                 tmp = addrrange_shift(cmr->addr,
1158                                       int128_sub(fr->addr.start,
1159                                                  int128_make64(fr->offset_in_region)));
1160                 if (!addrrange_intersects(tmp, fr->addr)) {
1161                     continue;
1162                 }
1163                 tmp = addrrange_intersection(tmp, fr->addr);
1164                 MEMORY_LISTENER_CALL(coalesced_mmio_add, Forward, &section,
1165                                      int128_get64(tmp.start),
1166                                      int128_get64(tmp.size));
1167             }
1168         }
1169     }
1170 }
1171
1172 static void memory_region_update_coalesced_range(MemoryRegion *mr)
1173 {
1174     AddressSpace *as;
1175
1176     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1177         memory_region_update_coalesced_range_as(mr, as);
1178     }
1179 }
1180
1181 void memory_region_set_coalescing(MemoryRegion *mr)
1182 {
1183     memory_region_clear_coalescing(mr);
1184     memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
1185 }
1186
1187 void memory_region_add_coalescing(MemoryRegion *mr,
1188                                   hwaddr offset,
1189                                   uint64_t size)
1190 {
1191     CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
1192
1193     cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
1194     QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
1195     memory_region_update_coalesced_range(mr);
1196     memory_region_set_flush_coalesced(mr);
1197 }
1198
1199 void memory_region_clear_coalescing(MemoryRegion *mr)
1200 {
1201     CoalescedMemoryRange *cmr;
1202
1203     qemu_flush_coalesced_mmio_buffer();
1204     mr->flush_coalesced_mmio = false;
1205
1206     while (!QTAILQ_EMPTY(&mr->coalesced)) {
1207         cmr = QTAILQ_FIRST(&mr->coalesced);
1208         QTAILQ_REMOVE(&mr->coalesced, cmr, link);
1209         g_free(cmr);
1210     }
1211     memory_region_update_coalesced_range(mr);
1212 }
1213
1214 void memory_region_set_flush_coalesced(MemoryRegion *mr)
1215 {
1216     mr->flush_coalesced_mmio = true;
1217 }
1218
1219 void memory_region_clear_flush_coalesced(MemoryRegion *mr)
1220 {
1221     qemu_flush_coalesced_mmio_buffer();
1222     if (QTAILQ_EMPTY(&mr->coalesced)) {
1223         mr->flush_coalesced_mmio = false;
1224     }
1225 }
1226
1227 void memory_region_add_eventfd(MemoryRegion *mr,
1228                                hwaddr addr,
1229                                unsigned size,
1230                                bool match_data,
1231                                uint64_t data,
1232                                EventNotifier *e)
1233 {
1234     MemoryRegionIoeventfd mrfd = {
1235         .addr.start = int128_make64(addr),
1236         .addr.size = int128_make64(size),
1237         .match_data = match_data,
1238         .data = data,
1239         .e = e,
1240     };
1241     unsigned i;
1242
1243     adjust_endianness(mr, &mrfd.data, size);
1244     memory_region_transaction_begin();
1245     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1246         if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
1247             break;
1248         }
1249     }
1250     ++mr->ioeventfd_nb;
1251     mr->ioeventfds = g_realloc(mr->ioeventfds,
1252                                   sizeof(*mr->ioeventfds) * mr->ioeventfd_nb);
1253     memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i],
1254             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i));
1255     mr->ioeventfds[i] = mrfd;
1256     memory_region_update_pending |= mr->enabled;
1257     memory_region_transaction_commit();
1258 }
1259
1260 void memory_region_del_eventfd(MemoryRegion *mr,
1261                                hwaddr addr,
1262                                unsigned size,
1263                                bool match_data,
1264                                uint64_t data,
1265                                EventNotifier *e)
1266 {
1267     MemoryRegionIoeventfd mrfd = {
1268         .addr.start = int128_make64(addr),
1269         .addr.size = int128_make64(size),
1270         .match_data = match_data,
1271         .data = data,
1272         .e = e,
1273     };
1274     unsigned i;
1275
1276     adjust_endianness(mr, &mrfd.data, size);
1277     memory_region_transaction_begin();
1278     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1279         if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {
1280             break;
1281         }
1282     }
1283     assert(i != mr->ioeventfd_nb);
1284     memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1],
1285             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1)));
1286     --mr->ioeventfd_nb;
1287     mr->ioeventfds = g_realloc(mr->ioeventfds,
1288                                   sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1);
1289     memory_region_update_pending |= mr->enabled;
1290     memory_region_transaction_commit();
1291 }
1292
1293 static void memory_region_add_subregion_common(MemoryRegion *mr,
1294                                                hwaddr offset,
1295                                                MemoryRegion *subregion)
1296 {
1297     MemoryRegion *other;
1298
1299     memory_region_transaction_begin();
1300
1301     assert(!subregion->parent);
1302     subregion->parent = mr;
1303     subregion->addr = offset;
1304     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1305         if (subregion->may_overlap || other->may_overlap) {
1306             continue;
1307         }
1308         if (int128_gt(int128_make64(offset),
1309                       int128_add(int128_make64(other->addr), other->size))
1310             || int128_le(int128_add(int128_make64(offset), subregion->size),
1311                          int128_make64(other->addr))) {
1312             continue;
1313         }
1314 #if 0
1315         printf("warning: subregion collision %llx/%llx (%s) "
1316                "vs %llx/%llx (%s)\n",
1317                (unsigned long long)offset,
1318                (unsigned long long)int128_get64(subregion->size),
1319                subregion->name,
1320                (unsigned long long)other->addr,
1321                (unsigned long long)int128_get64(other->size),
1322                other->name);
1323 #endif
1324     }
1325     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1326         if (subregion->priority >= other->priority) {
1327             QTAILQ_INSERT_BEFORE(other, subregion, subregions_link);
1328             goto done;
1329         }
1330     }
1331     QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link);
1332 done:
1333     memory_region_update_pending |= mr->enabled && subregion->enabled;
1334     memory_region_transaction_commit();
1335 }
1336
1337
1338 void memory_region_add_subregion(MemoryRegion *mr,
1339                                  hwaddr offset,
1340                                  MemoryRegion *subregion)
1341 {
1342     subregion->may_overlap = false;
1343     subregion->priority = 0;
1344     memory_region_add_subregion_common(mr, offset, subregion);
1345 }
1346
1347 void memory_region_add_subregion_overlap(MemoryRegion *mr,
1348                                          hwaddr offset,
1349                                          MemoryRegion *subregion,
1350                                          unsigned priority)
1351 {
1352     subregion->may_overlap = true;
1353     subregion->priority = priority;
1354     memory_region_add_subregion_common(mr, offset, subregion);
1355 }
1356
1357 void memory_region_del_subregion(MemoryRegion *mr,
1358                                  MemoryRegion *subregion)
1359 {
1360     memory_region_transaction_begin();
1361     assert(subregion->parent == mr);
1362     subregion->parent = NULL;
1363     QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
1364     memory_region_update_pending |= mr->enabled && subregion->enabled;
1365     memory_region_transaction_commit();
1366 }
1367
1368 void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
1369 {
1370     if (enabled == mr->enabled) {
1371         return;
1372     }
1373     memory_region_transaction_begin();
1374     mr->enabled = enabled;
1375     memory_region_update_pending = true;
1376     memory_region_transaction_commit();
1377 }
1378
1379 void memory_region_set_address(MemoryRegion *mr, hwaddr addr)
1380 {
1381     MemoryRegion *parent = mr->parent;
1382     unsigned priority = mr->priority;
1383     bool may_overlap = mr->may_overlap;
1384
1385     if (addr == mr->addr || !parent) {
1386         mr->addr = addr;
1387         return;
1388     }
1389
1390     memory_region_transaction_begin();
1391     memory_region_del_subregion(parent, mr);
1392     if (may_overlap) {
1393         memory_region_add_subregion_overlap(parent, addr, mr, priority);
1394     } else {
1395         memory_region_add_subregion(parent, addr, mr);
1396     }
1397     memory_region_transaction_commit();
1398 }
1399
1400 void memory_region_set_alias_offset(MemoryRegion *mr, hwaddr offset)
1401 {
1402     assert(mr->alias);
1403
1404     if (offset == mr->alias_offset) {
1405         return;
1406     }
1407
1408     memory_region_transaction_begin();
1409     mr->alias_offset = offset;
1410     memory_region_update_pending |= mr->enabled;
1411     memory_region_transaction_commit();
1412 }
1413
1414 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
1415 {
1416     return mr->ram_addr;
1417 }
1418
1419 static int cmp_flatrange_addr(const void *addr_, const void *fr_)
1420 {
1421     const AddrRange *addr = addr_;
1422     const FlatRange *fr = fr_;
1423
1424     if (int128_le(addrrange_end(*addr), fr->addr.start)) {
1425         return -1;
1426     } else if (int128_ge(addr->start, addrrange_end(fr->addr))) {
1427         return 1;
1428     }
1429     return 0;
1430 }
1431
1432 static FlatRange *address_space_lookup(AddressSpace *as, AddrRange addr)
1433 {
1434     return bsearch(&addr, as->current_map->ranges, as->current_map->nr,
1435                    sizeof(FlatRange), cmp_flatrange_addr);
1436 }
1437
1438 MemoryRegionSection memory_region_find(MemoryRegion *address_space,
1439                                        hwaddr addr, uint64_t size)
1440 {
1441     AddressSpace *as = memory_region_to_address_space(address_space);
1442     AddrRange range = addrrange_make(int128_make64(addr),
1443                                      int128_make64(size));
1444     FlatRange *fr = address_space_lookup(as, range);
1445     MemoryRegionSection ret = { .mr = NULL, .size = 0 };
1446
1447     if (!fr) {
1448         return ret;
1449     }
1450
1451     while (fr > as->current_map->ranges
1452            && addrrange_intersects(fr[-1].addr, range)) {
1453         --fr;
1454     }
1455
1456     ret.mr = fr->mr;
1457     range = addrrange_intersection(range, fr->addr);
1458     ret.offset_within_region = fr->offset_in_region;
1459     ret.offset_within_region += int128_get64(int128_sub(range.start,
1460                                                         fr->addr.start));
1461     ret.size = int128_get64(range.size);
1462     ret.offset_within_address_space = int128_get64(range.start);
1463     ret.readonly = fr->readonly;
1464     return ret;
1465 }
1466
1467 void memory_global_sync_dirty_bitmap(MemoryRegion *address_space)
1468 {
1469     AddressSpace *as = memory_region_to_address_space(address_space);
1470     FlatRange *fr;
1471
1472     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1473         MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1474     }
1475 }
1476
1477 void memory_global_dirty_log_start(void)
1478 {
1479     global_dirty_log = true;
1480     MEMORY_LISTENER_CALL_GLOBAL(log_global_start, Forward);
1481 }
1482
1483 void memory_global_dirty_log_stop(void)
1484 {
1485     global_dirty_log = false;
1486     MEMORY_LISTENER_CALL_GLOBAL(log_global_stop, Reverse);
1487 }
1488
1489 static void listener_add_address_space(MemoryListener *listener,
1490                                        AddressSpace *as)
1491 {
1492     FlatRange *fr;
1493
1494     if (listener->address_space_filter
1495         && listener->address_space_filter != as) {
1496         return;
1497     }
1498
1499     if (global_dirty_log) {
1500         if (listener->log_global_start) {
1501             listener->log_global_start(listener);
1502         }
1503     }
1504
1505     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1506         MemoryRegionSection section = {
1507             .mr = fr->mr,
1508             .address_space = as,
1509             .offset_within_region = fr->offset_in_region,
1510             .size = int128_get64(fr->addr.size),
1511             .offset_within_address_space = int128_get64(fr->addr.start),
1512             .readonly = fr->readonly,
1513         };
1514         if (listener->region_add) {
1515             listener->region_add(listener, &section);
1516         }
1517     }
1518 }
1519
1520 void memory_listener_register(MemoryListener *listener, AddressSpace *filter)
1521 {
1522     MemoryListener *other = NULL;
1523     AddressSpace *as;
1524
1525     listener->address_space_filter = filter;
1526     if (QTAILQ_EMPTY(&memory_listeners)
1527         || listener->priority >= QTAILQ_LAST(&memory_listeners,
1528                                              memory_listeners)->priority) {
1529         QTAILQ_INSERT_TAIL(&memory_listeners, listener, link);
1530     } else {
1531         QTAILQ_FOREACH(other, &memory_listeners, link) {
1532             if (listener->priority < other->priority) {
1533                 break;
1534             }
1535         }
1536         QTAILQ_INSERT_BEFORE(other, listener, link);
1537     }
1538
1539     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1540         listener_add_address_space(listener, as);
1541     }
1542 }
1543
1544 void memory_listener_unregister(MemoryListener *listener)
1545 {
1546     QTAILQ_REMOVE(&memory_listeners, listener, link);
1547 }
1548
1549 void address_space_init(AddressSpace *as, MemoryRegion *root)
1550 {
1551     memory_region_transaction_begin();
1552     as->root = root;
1553     as->current_map = g_new(FlatView, 1);
1554     flatview_init(as->current_map);
1555     QTAILQ_INSERT_TAIL(&address_spaces, as, address_spaces_link);
1556     as->name = NULL;
1557     memory_region_transaction_commit();
1558     address_space_init_dispatch(as);
1559 }
1560
1561 void address_space_destroy(AddressSpace *as)
1562 {
1563     /* Flush out anything from MemoryListeners listening in on this */
1564     memory_region_transaction_begin();
1565     as->root = NULL;
1566     memory_region_transaction_commit();
1567     QTAILQ_REMOVE(&address_spaces, as, address_spaces_link);
1568     address_space_destroy_dispatch(as);
1569     flatview_destroy(as->current_map);
1570     g_free(as->current_map);
1571 }
1572
1573 uint64_t io_mem_read(MemoryRegion *mr, hwaddr addr, unsigned size)
1574 {
1575     return memory_region_dispatch_read(mr, addr, size);
1576 }
1577
1578 void io_mem_write(MemoryRegion *mr, hwaddr addr,
1579                   uint64_t val, unsigned size)
1580 {
1581     memory_region_dispatch_write(mr, addr, val, size);
1582 }
1583
1584 typedef struct MemoryRegionList MemoryRegionList;
1585
1586 struct MemoryRegionList {
1587     const MemoryRegion *mr;
1588     bool printed;
1589     QTAILQ_ENTRY(MemoryRegionList) queue;
1590 };
1591
1592 typedef QTAILQ_HEAD(queue, MemoryRegionList) MemoryRegionListHead;
1593
1594 static void mtree_print_mr(fprintf_function mon_printf, void *f,
1595                            const MemoryRegion *mr, unsigned int level,
1596                            hwaddr base,
1597                            MemoryRegionListHead *alias_print_queue)
1598 {
1599     MemoryRegionList *new_ml, *ml, *next_ml;
1600     MemoryRegionListHead submr_print_queue;
1601     const MemoryRegion *submr;
1602     unsigned int i;
1603
1604     if (!mr || !mr->enabled) {
1605         return;
1606     }
1607
1608     for (i = 0; i < level; i++) {
1609         mon_printf(f, "  ");
1610     }
1611
1612     if (mr->alias) {
1613         MemoryRegionList *ml;
1614         bool found = false;
1615
1616         /* check if the alias is already in the queue */
1617         QTAILQ_FOREACH(ml, alias_print_queue, queue) {
1618             if (ml->mr == mr->alias && !ml->printed) {
1619                 found = true;
1620             }
1621         }
1622
1623         if (!found) {
1624             ml = g_new(MemoryRegionList, 1);
1625             ml->mr = mr->alias;
1626             ml->printed = false;
1627             QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue);
1628         }
1629         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx
1630                    " (prio %d, %c%c): alias %s @%s " TARGET_FMT_plx
1631                    "-" TARGET_FMT_plx "\n",
1632                    base + mr->addr,
1633                    base + mr->addr
1634                    + (hwaddr)int128_get64(mr->size) - 1,
1635                    mr->priority,
1636                    mr->readable ? 'R' : '-',
1637                    !mr->readonly && !(mr->rom_device && mr->readable) ? 'W'
1638                                                                       : '-',
1639                    mr->name,
1640                    mr->alias->name,
1641                    mr->alias_offset,
1642                    mr->alias_offset
1643                    + (hwaddr)int128_get64(mr->size) - 1);
1644     } else {
1645         mon_printf(f,
1646                    TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d, %c%c): %s\n",
1647                    base + mr->addr,
1648                    base + mr->addr
1649                    + (hwaddr)int128_get64(mr->size) - 1,
1650                    mr->priority,
1651                    mr->readable ? 'R' : '-',
1652                    !mr->readonly && !(mr->rom_device && mr->readable) ? 'W'
1653                                                                       : '-',
1654                    mr->name);
1655     }
1656
1657     QTAILQ_INIT(&submr_print_queue);
1658
1659     QTAILQ_FOREACH(submr, &mr->subregions, subregions_link) {
1660         new_ml = g_new(MemoryRegionList, 1);
1661         new_ml->mr = submr;
1662         QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1663             if (new_ml->mr->addr < ml->mr->addr ||
1664                 (new_ml->mr->addr == ml->mr->addr &&
1665                  new_ml->mr->priority > ml->mr->priority)) {
1666                 QTAILQ_INSERT_BEFORE(ml, new_ml, queue);
1667                 new_ml = NULL;
1668                 break;
1669             }
1670         }
1671         if (new_ml) {
1672             QTAILQ_INSERT_TAIL(&submr_print_queue, new_ml, queue);
1673         }
1674     }
1675
1676     QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1677         mtree_print_mr(mon_printf, f, ml->mr, level + 1, base + mr->addr,
1678                        alias_print_queue);
1679     }
1680
1681     QTAILQ_FOREACH_SAFE(ml, &submr_print_queue, queue, next_ml) {
1682         g_free(ml);
1683     }
1684 }
1685
1686 void mtree_info(fprintf_function mon_printf, void *f)
1687 {
1688     MemoryRegionListHead ml_head;
1689     MemoryRegionList *ml, *ml2;
1690     AddressSpace *as;
1691
1692     QTAILQ_INIT(&ml_head);
1693
1694     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1695         if (!as->name) {
1696             continue;
1697         }
1698         mon_printf(f, "%s\n", as->name);
1699         mtree_print_mr(mon_printf, f, as->root, 0, 0, &ml_head);
1700     }
1701
1702     mon_printf(f, "aliases\n");
1703     /* print aliased regions */
1704     QTAILQ_FOREACH(ml, &ml_head, queue) {
1705         if (!ml->printed) {
1706             mon_printf(f, "%s\n", ml->mr->name);
1707             mtree_print_mr(mon_printf, f, ml->mr, 0, 0, &ml_head);
1708         }
1709     }
1710
1711     QTAILQ_FOREACH_SAFE(ml, &ml_head, queue, ml2) {
1712         g_free(ml);
1713     }
1714 }