memory.c

   1 /*
   2  * Physical memory management
   3  *
   4  * Copyright 2011 Red Hat, Inc. and/or its affiliates
   5  *
   6  * Authors:
   7  *  Avi Kivity <[email protected]>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Contributions after 2012-01-13 are licensed under the terms of the
  13  * GNU GPL, version 2 or (at your option) any later version.
  14  */
  15
  16 #include "memory.h"
  17 #include "exec-memory.h"
  18 #include "ioport.h"
  19 #include "bitops.h"
  20 #include "kvm.h"
  21 #include <assert.h>
  22
  23 #include "memory-internal.h"
  24
  25 unsigned memory_region_transaction_depth = 0;
  26 static bool global_dirty_log = false;
  27
  28 static QTAILQ_HEAD(memory_listeners, MemoryListener) memory_listeners
  29     = QTAILQ_HEAD_INITIALIZER(memory_listeners);
  30
  31 static QTAILQ_HEAD(, AddressSpace) address_spaces
  32     = QTAILQ_HEAD_INITIALIZER(address_spaces);
  33
  34 typedef struct AddrRange AddrRange;
  35
  36 /*
  37  * Note using signed integers limits us to physical addresses at most
  38  * 63 bits wide.  They are needed for negative offsetting in aliases
  39  * (large MemoryRegion::alias_offset).
  40  */
  41 struct AddrRange {
  42     Int128 start;
  43     Int128 size;
  44 };
  45
  46 static AddrRange addrrange_make(Int128 start, Int128 size)
  47 {
  48     return (AddrRange) { start, size };
  49 }
  50
  51 static bool addrrange_equal(AddrRange r1, AddrRange r2)
  52 {
  53     return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
  54 }
  55
  56 static Int128 addrrange_end(AddrRange r)
  57 {
  58     return int128_add(r.start, r.size);
  59 }
  60
  61 static AddrRange addrrange_shift(AddrRange range, Int128 delta)
  62 {
  63     int128_addto(&range.start, delta);
  64     return range;
  65 }
  66
  67 static bool addrrange_contains(AddrRange range, Int128 addr)
  68 {
  69     return int128_ge(addr, range.start)
  70         && int128_lt(addr, addrrange_end(range));
  71 }
  72
  73 static bool addrrange_intersects(AddrRange r1, AddrRange r2)
  74 {
  75     return addrrange_contains(r1, r2.start)
  76         || addrrange_contains(r2, r1.start);
  77 }
  78
  79 static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
  80 {
  81     Int128 start = int128_max(r1.start, r2.start);
  82     Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
  83     return addrrange_make(start, int128_sub(end, start));
  84 }
  85
  86 enum ListenerDirection { Forward, Reverse };
  87
  88 static bool memory_listener_match(MemoryListener *listener,
  89                                   MemoryRegionSection *section)
  90 {
  91     return !listener->address_space_filter
  92         || listener->address_space_filter == section->address_space;
  93 }
  94
  95 #define MEMORY_LISTENER_CALL_GLOBAL(_callback, _direction, _args...)    \
  96     do {                                                                \
  97         MemoryListener *_listener;                                      \
  98                                                                         \
  99         switch (_direction) {                                           \
 100         case Forward:                                                   \
 101             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 102                 if (_listener->_callback) {                             \
 103                     _listener->_callback(_listener, ##_args);           \
 104                 }                                                       \
 105             }                                                           \
 106             break;                                                      \
 107         case Reverse:                                                   \
 108             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 109                                    memory_listeners, link) {            \
 110                 if (_listener->_callback) {                             \
 111                     _listener->_callback(_listener, ##_args);           \
 112                 }                                                       \
 113             }                                                           \
 114             break;                                                      \
 115         default:                                                        \
 116             abort();                                                    \
 117         }                                                               \
 118     } while (0)
 119
 120 #define MEMORY_LISTENER_CALL(_callback, _direction, _section, _args...) \
 121     do {                                                                \
 122         MemoryListener *_listener;                                      \
 123                                                                         \
 124         switch (_direction) {                                           \
 125         case Forward:                                                   \
 126             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 127                 if (_listener->_callback                                \
 128                     && memory_listener_match(_listener, _section)) {    \
 129                     _listener->_callback(_listener, _section, ##_args); \
 130                 }                                                       \
 131             }                                                           \
 132             break;                                                      \
 133         case Reverse:                                                   \
 134             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 135                                    memory_listeners, link) {            \
 136                 if (_listener->_callback                                \
 137                     && memory_listener_match(_listener, _section)) {    \
 138                     _listener->_callback(_listener, _section, ##_args); \
 139                 }                                                       \
 140             }                                                           \
 141             break;                                                      \
 142         default:                                                        \
 143             abort();                                                    \
 144         }                                                               \
 145     } while (0)
 146
 147 #define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback)            \
 148     MEMORY_LISTENER_CALL(callback, dir, (&(MemoryRegionSection) {       \
 149         .mr = (fr)->mr,                                                 \
 150         .address_space = (as),                                          \
 151         .offset_within_region = (fr)->offset_in_region,                 \
 152         .size = int128_get64((fr)->addr.size),                          \
 153         .offset_within_address_space = int128_get64((fr)->addr.start),  \
 154         .readonly = (fr)->readonly,                                     \
 155               }))
 156
 157 struct CoalescedMemoryRange {
 158     AddrRange addr;
 159     QTAILQ_ENTRY(CoalescedMemoryRange) link;
 160 };
 161
 162 struct MemoryRegionIoeventfd {
 163     AddrRange addr;
 164     bool match_data;
 165     uint64_t data;
 166     EventNotifier *e;
 167 };
 168
 169 static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
 170                                            MemoryRegionIoeventfd b)
 171 {
 172     if (int128_lt(a.addr.start, b.addr.start)) {
 173         return true;
 174     } else if (int128_gt(a.addr.start, b.addr.start)) {
 175         return false;
 176     } else if (int128_lt(a.addr.size, b.addr.size)) {
 177         return true;
 178     } else if (int128_gt(a.addr.size, b.addr.size)) {
 179         return false;
 180     } else if (a.match_data < b.match_data) {
 181         return true;
 182     } else  if (a.match_data > b.match_data) {
 183         return false;
 184     } else if (a.match_data) {
 185         if (a.data < b.data) {
 186             return true;
 187         } else if (a.data > b.data) {
 188             return false;
 189         }
 190     }
 191     if (a.e < b.e) {
 192         return true;
 193     } else if (a.e > b.e) {
 194         return false;
 195     }
 196     return false;
 197 }
 198
 199 static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
 200                                           MemoryRegionIoeventfd b)
 201 {
 202     return !memory_region_ioeventfd_before(a, b)
 203         && !memory_region_ioeventfd_before(b, a);
 204 }
 205
 206 typedef struct FlatRange FlatRange;
 207 typedef struct FlatView FlatView;
 208
 209 /* Range of memory in the global map.  Addresses are absolute. */
 210 struct FlatRange {
 211     MemoryRegion *mr;
 212     hwaddr offset_in_region;
 213     AddrRange addr;
 214     uint8_t dirty_log_mask;
 215     bool readable;
 216     bool readonly;
 217 };
 218
 219 /* Flattened global view of current active memory hierarchy.  Kept in sorted
 220  * order.
 221  */
 222 struct FlatView {
 223     FlatRange *ranges;
 224     unsigned nr;
 225     unsigned nr_allocated;
 226 };
 227
 228 typedef struct AddressSpaceOps AddressSpaceOps;
 229
 230 #define FOR_EACH_FLAT_RANGE(var, view)          \
 231     for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
 232
 233 static bool flatrange_equal(FlatRange *a, FlatRange *b)
 234 {
 235     return a->mr == b->mr
 236         && addrrange_equal(a->addr, b->addr)
 237         && a->offset_in_region == b->offset_in_region
 238         && a->readable == b->readable
 239         && a->readonly == b->readonly;
 240 }
 241
 242 static void flatview_init(FlatView *view)
 243 {
 244     view->ranges = NULL;
 245     view->nr = 0;
 246     view->nr_allocated = 0;
 247 }
 248
 249 /* Insert a range into a given position.  Caller is responsible for maintaining
 250  * sorting order.
 251  */
 252 static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range)
 253 {
 254     if (view->nr == view->nr_allocated) {
 255         view->nr_allocated = MAX(2 * view->nr, 10);
 256         view->ranges = g_realloc(view->ranges,
 257                                     view->nr_allocated * sizeof(*view->ranges));
 258     }
 259     memmove(view->ranges + pos + 1, view->ranges + pos,
 260             (view->nr - pos) * sizeof(FlatRange));
 261     view->ranges[pos] = *range;
 262     ++view->nr;
 263 }
 264
 265 static void flatview_destroy(FlatView *view)
 266 {
 267     g_free(view->ranges);
 268 }
 269
 270 static bool can_merge(FlatRange *r1, FlatRange *r2)
 271 {
 272     return int128_eq(addrrange_end(r1->addr), r2->addr.start)
 273         && r1->mr == r2->mr
 274         && int128_eq(int128_add(int128_make64(r1->offset_in_region),
 275                                 r1->addr.size),
 276                      int128_make64(r2->offset_in_region))
 277         && r1->dirty_log_mask == r2->dirty_log_mask
 278         && r1->readable == r2->readable
 279         && r1->readonly == r2->readonly;
 280 }
 281
 282 /* Attempt to simplify a view by merging ajacent ranges */
 283 static void flatview_simplify(FlatView *view)
 284 {
 285     unsigned i, j;
 286
 287     i = 0;
 288     while (i < view->nr) {
 289         j = i + 1;
 290         while (j < view->nr
 291                && can_merge(&view->ranges[j-1], &view->ranges[j])) {
 292             int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
 293             ++j;
 294         }
 295         ++i;
 296         memmove(&view->ranges[i], &view->ranges[j],
 297                 (view->nr - j) * sizeof(view->ranges[j]));
 298         view->nr -= j - i;
 299     }
 300 }
 301
 302 static void memory_region_read_accessor(void *opaque,
 303                                         hwaddr addr,
 304                                         uint64_t *value,
 305                                         unsigned size,
 306                                         unsigned shift,
 307                                         uint64_t mask)
 308 {
 309     MemoryRegion *mr = opaque;
 310     uint64_t tmp;
 311
 312     if (mr->flush_coalesced_mmio) {
 313         qemu_flush_coalesced_mmio_buffer();
 314     }
 315     tmp = mr->ops->read(mr->opaque, addr, size);
 316     *value |= (tmp & mask) << shift;
 317 }
 318
 319 static void memory_region_write_accessor(void *opaque,
 320                                          hwaddr addr,
 321                                          uint64_t *value,
 322                                          unsigned size,
 323                                          unsigned shift,
 324                                          uint64_t mask)
 325 {
 326     MemoryRegion *mr = opaque;
 327     uint64_t tmp;
 328
 329     if (mr->flush_coalesced_mmio) {
 330         qemu_flush_coalesced_mmio_buffer();
 331     }
 332     tmp = (*value >> shift) & mask;
 333     mr->ops->write(mr->opaque, addr, tmp, size);
 334 }
 335
 336 static void access_with_adjusted_size(hwaddr addr,
 337                                       uint64_t *value,
 338                                       unsigned size,
 339                                       unsigned access_size_min,
 340                                       unsigned access_size_max,
 341                                       void (*access)(void *opaque,
 342                                                      hwaddr addr,
 343                                                      uint64_t *value,
 344                                                      unsigned size,
 345                                                      unsigned shift,
 346                                                      uint64_t mask),
 347                                       void *opaque)
 348 {
 349     uint64_t access_mask;
 350     unsigned access_size;
 351     unsigned i;
 352
 353     if (!access_size_min) {
 354         access_size_min = 1;
 355     }
 356     if (!access_size_max) {
 357         access_size_max = 4;
 358     }
 359     access_size = MAX(MIN(size, access_size_max), access_size_min);
 360     access_mask = -1ULL >> (64 - access_size * 8);
 361     for (i = 0; i < size; i += access_size) {
 362         /* FIXME: big-endian support */
 363         access(opaque, addr + i, value, access_size, i * 8, access_mask);
 364     }
 365 }
 366
 367 static const MemoryRegionPortio *find_portio(MemoryRegion *mr, uint64_t offset,
 368                                              unsigned width, bool write)
 369 {
 370     const MemoryRegionPortio *mrp;
 371
 372     for (mrp = mr->ops->old_portio; mrp->size; ++mrp) {
 373         if (offset >= mrp->offset && offset < mrp->offset + mrp->len
 374             && width == mrp->size
 375             && (write ? (bool)mrp->write : (bool)mrp->read)) {
 376             return mrp;
 377         }
 378     }
 379     return NULL;
 380 }
 381
 382 static void memory_region_iorange_read(IORange *iorange,
 383                                        uint64_t offset,
 384                                        unsigned width,
 385                                        uint64_t *data)
 386 {
 387     MemoryRegionIORange *mrio
 388         = container_of(iorange, MemoryRegionIORange, iorange);
 389     MemoryRegion *mr = mrio->mr;
 390
 391     offset += mrio->offset;
 392     if (mr->ops->old_portio) {
 393         const MemoryRegionPortio *mrp = find_portio(mr, offset - mrio->offset,
 394                                                     width, false);
 395
 396         *data = ((uint64_t)1 << (width * 8)) - 1;
 397         if (mrp) {
 398             *data = mrp->read(mr->opaque, offset);
 399         } else if (width == 2) {
 400             mrp = find_portio(mr, offset - mrio->offset, 1, false);
 401             assert(mrp);
 402             *data = mrp->read(mr->opaque, offset) |
 403                     (mrp->read(mr->opaque, offset + 1) << 8);
 404         }
 405         return;
 406     }
 407     *data = 0;
 408     access_with_adjusted_size(offset, data, width,
 409                               mr->ops->impl.min_access_size,
 410                               mr->ops->impl.max_access_size,
 411                               memory_region_read_accessor, mr);
 412 }
 413
 414 static void memory_region_iorange_write(IORange *iorange,
 415                                         uint64_t offset,
 416                                         unsigned width,
 417                                         uint64_t data)
 418 {
 419     MemoryRegionIORange *mrio
 420         = container_of(iorange, MemoryRegionIORange, iorange);
 421     MemoryRegion *mr = mrio->mr;
 422
 423     offset += mrio->offset;
 424     if (mr->ops->old_portio) {
 425         const MemoryRegionPortio *mrp = find_portio(mr, offset - mrio->offset,
 426                                                     width, true);
 427
 428         if (mrp) {
 429             mrp->write(mr->opaque, offset, data);
 430         } else if (width == 2) {
 431             mrp = find_portio(mr, offset - mrio->offset, 1, true);
 432             assert(mrp);
 433             mrp->write(mr->opaque, offset, data & 0xff);
 434             mrp->write(mr->opaque, offset + 1, data >> 8);
 435         }
 436         return;
 437     }
 438     access_with_adjusted_size(offset, &data, width,
 439                               mr->ops->impl.min_access_size,
 440                               mr->ops->impl.max_access_size,
 441                               memory_region_write_accessor, mr);
 442 }
 443
 444 static void memory_region_iorange_destructor(IORange *iorange)
 445 {
 446     g_free(container_of(iorange, MemoryRegionIORange, iorange));
 447 }
 448
 449 const IORangeOps memory_region_iorange_ops = {
 450     .read = memory_region_iorange_read,
 451     .write = memory_region_iorange_write,
 452     .destructor = memory_region_iorange_destructor,
 453 };
 454
 455 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
 456 {
 457     AddressSpace *as;
 458
 459     while (mr->parent) {
 460         mr = mr->parent;
 461     }
 462     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 463         if (mr == as->root) {
 464             return as;
 465         }
 466     }
 467     abort();
 468 }
 469
 470 /* Render a memory region into the global view.  Ranges in @view obscure
 471  * ranges in @mr.
 472  */
 473 static void render_memory_region(FlatView *view,
 474                                  MemoryRegion *mr,
 475                                  Int128 base,
 476                                  AddrRange clip,
 477                                  bool readonly)
 478 {
 479     MemoryRegion *subregion;
 480     unsigned i;
 481     hwaddr offset_in_region;
 482     Int128 remain;
 483     Int128 now;
 484     FlatRange fr;
 485     AddrRange tmp;
 486
 487     if (!mr->enabled) {
 488         return;
 489     }
 490
 491     int128_addto(&base, int128_make64(mr->addr));
 492     readonly |= mr->readonly;
 493
 494     tmp = addrrange_make(base, mr->size);
 495
 496     if (!addrrange_intersects(tmp, clip)) {
 497         return;
 498     }
 499
 500     clip = addrrange_intersection(tmp, clip);
 501
 502     if (mr->alias) {
 503         int128_subfrom(&base, int128_make64(mr->alias->addr));
 504         int128_subfrom(&base, int128_make64(mr->alias_offset));
 505         render_memory_region(view, mr->alias, base, clip, readonly);
 506         return;
 507     }
 508
 509     /* Render subregions in priority order. */
 510     QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) {
 511         render_memory_region(view, subregion, base, clip, readonly);
 512     }
 513
 514     if (!mr->terminates) {
 515         return;
 516     }
 517
 518     offset_in_region = int128_get64(int128_sub(clip.start, base));
 519     base = clip.start;
 520     remain = clip.size;
 521
 522     /* Render the region itself into any gaps left by the current view. */
 523     for (i = 0; i < view->nr && int128_nz(remain); ++i) {
 524         if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
 525             continue;
 526         }
 527         if (int128_lt(base, view->ranges[i].addr.start)) {
 528             now = int128_min(remain,
 529                              int128_sub(view->ranges[i].addr.start, base));
 530             fr.mr = mr;
 531             fr.offset_in_region = offset_in_region;
 532             fr.addr = addrrange_make(base, now);
 533             fr.dirty_log_mask = mr->dirty_log_mask;
 534             fr.readable = mr->readable;
 535             fr.readonly = readonly;
 536             flatview_insert(view, i, &fr);
 537             ++i;
 538             int128_addto(&base, now);
 539             offset_in_region += int128_get64(now);
 540             int128_subfrom(&remain, now);
 541         }
 542         now = int128_sub(int128_min(int128_add(base, remain),
 543                                     addrrange_end(view->ranges[i].addr)),
 544                          base);
 545         int128_addto(&base, now);
 546         offset_in_region += int128_get64(now);
 547         int128_subfrom(&remain, now);
 548     }
 549     if (int128_nz(remain)) {
 550         fr.mr = mr;
 551         fr.offset_in_region = offset_in_region;
 552         fr.addr = addrrange_make(base, remain);
 553         fr.dirty_log_mask = mr->dirty_log_mask;
 554         fr.readable = mr->readable;
 555         fr.readonly = readonly;
 556         flatview_insert(view, i, &fr);
 557     }
 558 }
 559
 560 /* Render a memory topology into a list of disjoint absolute ranges. */
 561 static FlatView generate_memory_topology(MemoryRegion *mr)
 562 {
 563     FlatView view;
 564
 565     flatview_init(&view);
 566
 567     if (mr) {
 568         render_memory_region(&view, mr, int128_zero(),
 569                              addrrange_make(int128_zero(), int128_2_64()), false);
 570     }
 571     flatview_simplify(&view);
 572
 573     return view;
 574 }
 575
 576 static void address_space_add_del_ioeventfds(AddressSpace *as,
 577                                              MemoryRegionIoeventfd *fds_new,
 578                                              unsigned fds_new_nb,
 579                                              MemoryRegionIoeventfd *fds_old,
 580                                              unsigned fds_old_nb)
 581 {
 582     unsigned iold, inew;
 583     MemoryRegionIoeventfd *fd;
 584     MemoryRegionSection section;
 585
 586     /* Generate a symmetric difference of the old and new fd sets, adding
 587      * and deleting as necessary.
 588      */
 589
 590     iold = inew = 0;
 591     while (iold < fds_old_nb || inew < fds_new_nb) {
 592         if (iold < fds_old_nb
 593             && (inew == fds_new_nb
 594                 || memory_region_ioeventfd_before(fds_old[iold],
 595                                                   fds_new[inew]))) {
 596             fd = &fds_old[iold];
 597             section = (MemoryRegionSection) {
 598                 .address_space = as,
 599                 .offset_within_address_space = int128_get64(fd->addr.start),
 600                 .size = int128_get64(fd->addr.size),
 601             };
 602             MEMORY_LISTENER_CALL(eventfd_del, Forward, &section,
 603                                  fd->match_data, fd->data, fd->e);
 604             ++iold;
 605         } else if (inew < fds_new_nb
 606                    && (iold == fds_old_nb
 607                        || memory_region_ioeventfd_before(fds_new[inew],
 608                                                          fds_old[iold]))) {
 609             fd = &fds_new[inew];
 610             section = (MemoryRegionSection) {
 611                 .address_space = as,
 612                 .offset_within_address_space = int128_get64(fd->addr.start),
 613                 .size = int128_get64(fd->addr.size),
 614             };
 615             MEMORY_LISTENER_CALL(eventfd_add, Reverse, &section,
 616                                  fd->match_data, fd->data, fd->e);
 617             ++inew;
 618         } else {
 619             ++iold;
 620             ++inew;
 621         }
 622     }
 623 }
 624
 625 static void address_space_update_ioeventfds(AddressSpace *as)
 626 {
 627     FlatRange *fr;
 628     unsigned ioeventfd_nb = 0;
 629     MemoryRegionIoeventfd *ioeventfds = NULL;
 630     AddrRange tmp;
 631     unsigned i;
 632
 633     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
 634         for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
 635             tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
 636                                   int128_sub(fr->addr.start,
 637                                              int128_make64(fr->offset_in_region)));
 638             if (addrrange_intersects(fr->addr, tmp)) {
 639                 ++ioeventfd_nb;
 640                 ioeventfds = g_realloc(ioeventfds,
 641                                           ioeventfd_nb * sizeof(*ioeventfds));
 642                 ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i];
 643                 ioeventfds[ioeventfd_nb-1].addr = tmp;
 644             }
 645         }
 646     }
 647
 648     address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb,
 649                                      as->ioeventfds, as->ioeventfd_nb);
 650
 651     g_free(as->ioeventfds);
 652     as->ioeventfds = ioeventfds;
 653     as->ioeventfd_nb = ioeventfd_nb;
 654 }
 655
 656 static void address_space_update_topology_pass(AddressSpace *as,
 657                                                FlatView old_view,
 658                                                FlatView new_view,
 659                                                bool adding)
 660 {
 661     unsigned iold, inew;
 662     FlatRange *frold, *frnew;
 663
 664     /* Generate a symmetric difference of the old and new memory maps.
 665      * Kill ranges in the old map, and instantiate ranges in the new map.
 666      */
 667     iold = inew = 0;
 668     while (iold < old_view.nr || inew < new_view.nr) {
 669         if (iold < old_view.nr) {
 670             frold = &old_view.ranges[iold];
 671         } else {
 672             frold = NULL;
 673         }
 674         if (inew < new_view.nr) {
 675             frnew = &new_view.ranges[inew];
 676         } else {
 677             frnew = NULL;
 678         }
 679
 680         if (frold
 681             && (!frnew
 682                 || int128_lt(frold->addr.start, frnew->addr.start)
 683                 || (int128_eq(frold->addr.start, frnew->addr.start)
 684                     && !flatrange_equal(frold, frnew)))) {
 685             /* In old, but (not in new, or in new but attributes changed). */
 686
 687             if (!adding) {
 688                 MEMORY_LISTENER_UPDATE_REGION(frold, as, Reverse, region_del);
 689             }
 690
 691             ++iold;
 692         } else if (frold && frnew && flatrange_equal(frold, frnew)) {
 693             /* In both (logging may have changed) */
 694
 695             if (adding) {
 696                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_nop);
 697                 if (frold->dirty_log_mask && !frnew->dirty_log_mask) {
 698                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Reverse, log_stop);
 699                 } else if (frnew->dirty_log_mask && !frold->dirty_log_mask) {
 700                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, log_start);
 701                 }
 702             }
 703
 704             ++iold;
 705             ++inew;
 706         } else {
 707             /* In new */
 708
 709             if (adding) {
 710                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_add);
 711             }
 712
 713             ++inew;
 714         }
 715     }
 716 }
 717
 718
 719 static void address_space_update_topology(AddressSpace *as)
 720 {
 721     FlatView old_view = *as->current_map;
 722     FlatView new_view = generate_memory_topology(as->root);
 723
 724     address_space_update_topology_pass(as, old_view, new_view, false);
 725     address_space_update_topology_pass(as, old_view, new_view, true);
 726
 727     *as->current_map = new_view;
 728     flatview_destroy(&old_view);
 729     address_space_update_ioeventfds(as);
 730 }
 731
 732 void memory_region_transaction_begin(void)
 733 {
 734     qemu_flush_coalesced_mmio_buffer();
 735     ++memory_region_transaction_depth;
 736 }
 737
 738 void memory_region_transaction_commit(void)
 739 {
 740     AddressSpace *as;
 741
 742     assert(memory_region_transaction_depth);
 743     --memory_region_transaction_depth;
 744     if (!memory_region_transaction_depth) {
 745         MEMORY_LISTENER_CALL_GLOBAL(begin, Forward);
 746
 747         QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 748             address_space_update_topology(as);
 749         }
 750
 751         MEMORY_LISTENER_CALL_GLOBAL(commit, Forward);
 752     }
 753 }
 754
 755 static void memory_region_destructor_none(MemoryRegion *mr)
 756 {
 757 }
 758
 759 static void memory_region_destructor_ram(MemoryRegion *mr)
 760 {
 761     qemu_ram_free(mr->ram_addr);
 762 }
 763
 764 static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
 765 {
 766     qemu_ram_free_from_ptr(mr->ram_addr);
 767 }
 768
 769 static void memory_region_destructor_iomem(MemoryRegion *mr)
 770 {
 771 }
 772
 773 static void memory_region_destructor_rom_device(MemoryRegion *mr)
 774 {
 775     qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
 776 }
 777
 778 static bool memory_region_wrong_endianness(MemoryRegion *mr)
 779 {
 780 #ifdef TARGET_WORDS_BIGENDIAN
 781     return mr->ops->endianness == DEVICE_LITTLE_ENDIAN;
 782 #else
 783     return mr->ops->endianness == DEVICE_BIG_ENDIAN;
 784 #endif
 785 }
 786
 787 void memory_region_init(MemoryRegion *mr,
 788                         const char *name,
 789                         uint64_t size)
 790 {
 791     mr->ops = NULL;
 792     mr->parent = NULL;
 793     mr->size = int128_make64(size);
 794     if (size == UINT64_MAX) {
 795         mr->size = int128_2_64();
 796     }
 797     mr->addr = 0;
 798     mr->subpage = false;
 799     mr->enabled = true;
 800     mr->terminates = false;
 801     mr->ram = false;
 802     mr->readable = true;
 803     mr->readonly = false;
 804     mr->rom_device = false;
 805     mr->destructor = memory_region_destructor_none;
 806     mr->priority = 0;
 807     mr->may_overlap = false;
 808     mr->alias = NULL;
 809     QTAILQ_INIT(&mr->subregions);
 810     memset(&mr->subregions_link, 0, sizeof mr->subregions_link);
 811     QTAILQ_INIT(&mr->coalesced);
 812     mr->name = g_strdup(name);
 813     mr->dirty_log_mask = 0;
 814     mr->ioeventfd_nb = 0;
 815     mr->ioeventfds = NULL;
 816     mr->flush_coalesced_mmio = false;
 817 }
 818
 819 static bool memory_region_access_valid(MemoryRegion *mr,
 820                                        hwaddr addr,
 821                                        unsigned size,
 822                                        bool is_write)
 823 {
 824     if (mr->ops->valid.accepts
 825         && !mr->ops->valid.accepts(mr->opaque, addr, size, is_write)) {
 826         return false;
 827     }
 828
 829     if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
 830         return false;
 831     }
 832
 833     /* Treat zero as compatibility all valid */
 834     if (!mr->ops->valid.max_access_size) {
 835         return true;
 836     }
 837
 838     if (size > mr->ops->valid.max_access_size
 839         || size < mr->ops->valid.min_access_size) {
 840         return false;
 841     }
 842     return true;
 843 }
 844
 845 static uint64_t memory_region_dispatch_read1(MemoryRegion *mr,
 846                                              hwaddr addr,
 847                                              unsigned size)
 848 {
 849     uint64_t data = 0;
 850
 851     if (!memory_region_access_valid(mr, addr, size, false)) {
 852         return -1U; /* FIXME: better signalling */
 853     }
 854
 855     if (!mr->ops->read) {
 856         return mr->ops->old_mmio.read[bitops_ffsl(size)](mr->opaque, addr);
 857     }
 858
 859     /* FIXME: support unaligned access */
 860     access_with_adjusted_size(addr, &data, size,
 861                               mr->ops->impl.min_access_size,
 862                               mr->ops->impl.max_access_size,
 863                               memory_region_read_accessor, mr);
 864
 865     return data;
 866 }
 867
 868 static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size)
 869 {
 870     if (memory_region_wrong_endianness(mr)) {
 871         switch (size) {
 872         case 1:
 873             break;
 874         case 2:
 875             *data = bswap16(*data);
 876             break;
 877         case 4:
 878             *data = bswap32(*data);
 879             break;
 880         default:
 881             abort();
 882         }
 883     }
 884 }
 885
 886 static uint64_t memory_region_dispatch_read(MemoryRegion *mr,
 887                                             hwaddr addr,
 888                                             unsigned size)
 889 {
 890     uint64_t ret;
 891
 892     ret = memory_region_dispatch_read1(mr, addr, size);
 893     adjust_endianness(mr, &ret, size);
 894     return ret;
 895 }
 896
 897 static void memory_region_dispatch_write(MemoryRegion *mr,
 898                                          hwaddr addr,
 899                                          uint64_t data,
 900                                          unsigned size)
 901 {
 902     if (!memory_region_access_valid(mr, addr, size, true)) {
 903         return; /* FIXME: better signalling */
 904     }
 905
 906     adjust_endianness(mr, &data, size);
 907
 908     if (!mr->ops->write) {
 909         mr->ops->old_mmio.write[bitops_ffsl(size)](mr->opaque, addr, data);
 910         return;
 911     }
 912
 913     /* FIXME: support unaligned access */
 914     access_with_adjusted_size(addr, &data, size,
 915                               mr->ops->impl.min_access_size,
 916                               mr->ops->impl.max_access_size,
 917                               memory_region_write_accessor, mr);
 918 }
 919
 920 void memory_region_init_io(MemoryRegion *mr,
 921                            const MemoryRegionOps *ops,
 922                            void *opaque,
 923                            const char *name,
 924                            uint64_t size)
 925 {
 926     memory_region_init(mr, name, size);
 927     mr->ops = ops;
 928     mr->opaque = opaque;
 929     mr->terminates = true;
 930     mr->destructor = memory_region_destructor_iomem;
 931     mr->ram_addr = ~(ram_addr_t)0;
 932 }
 933
 934 void memory_region_init_ram(MemoryRegion *mr,
 935                             const char *name,
 936                             uint64_t size)
 937 {
 938     memory_region_init(mr, name, size);
 939     mr->ram = true;
 940     mr->terminates = true;
 941     mr->destructor = memory_region_destructor_ram;
 942     mr->ram_addr = qemu_ram_alloc(size, mr);
 943 }
 944
 945 void memory_region_init_ram_ptr(MemoryRegion *mr,
 946                                 const char *name,
 947                                 uint64_t size,
 948                                 void *ptr)
 949 {
 950     memory_region_init(mr, name, size);
 951     mr->ram = true;
 952     mr->terminates = true;
 953     mr->destructor = memory_region_destructor_ram_from_ptr;
 954     mr->ram_addr = qemu_ram_alloc_from_ptr(size, ptr, mr);
 955 }
 956
 957 void memory_region_init_alias(MemoryRegion *mr,
 958                               const char *name,
 959                               MemoryRegion *orig,
 960                               hwaddr offset,
 961                               uint64_t size)
 962 {
 963     memory_region_init(mr, name, size);
 964     mr->alias = orig;
 965     mr->alias_offset = offset;
 966 }
 967
 968 void memory_region_init_rom_device(MemoryRegion *mr,
 969                                    const MemoryRegionOps *ops,
 970                                    void *opaque,
 971                                    const char *name,
 972                                    uint64_t size)
 973 {
 974     memory_region_init(mr, name, size);
 975     mr->ops = ops;
 976     mr->opaque = opaque;
 977     mr->terminates = true;
 978     mr->rom_device = true;
 979     mr->destructor = memory_region_destructor_rom_device;
 980     mr->ram_addr = qemu_ram_alloc(size, mr);
 981 }
 982
 983 static uint64_t invalid_read(void *opaque, hwaddr addr,
 984                              unsigned size)
 985 {
 986     MemoryRegion *mr = opaque;
 987
 988     if (!mr->warning_printed) {
 989         fprintf(stderr, "Invalid read from memory region %s\n", mr->name);
 990         mr->warning_printed = true;
 991     }
 992     return -1U;
 993 }
 994
 995 static void invalid_write(void *opaque, hwaddr addr, uint64_t data,
 996                           unsigned size)
 997 {
 998     MemoryRegion *mr = opaque;
 999
1000     if (!mr->warning_printed) {
1001         fprintf(stderr, "Invalid write to memory region %s\n", mr->name);
1002         mr->warning_printed = true;
1003     }
1004 }
1005
1006 static const MemoryRegionOps reservation_ops = {
1007     .read = invalid_read,
1008     .write = invalid_write,
1009     .endianness = DEVICE_NATIVE_ENDIAN,
1010 };
1011
1012 void memory_region_init_reservation(MemoryRegion *mr,
1013                                     const char *name,
1014                                     uint64_t size)
1015 {
1016     memory_region_init_io(mr, &reservation_ops, mr, name, size);
1017 }
1018
1019 void memory_region_destroy(MemoryRegion *mr)
1020 {
1021     assert(QTAILQ_EMPTY(&mr->subregions));
1022     assert(memory_region_transaction_depth == 0);
1023     mr->destructor(mr);
1024     memory_region_clear_coalescing(mr);
1025     g_free((char *)mr->name);
1026     g_free(mr->ioeventfds);
1027 }
1028
1029 uint64_t memory_region_size(MemoryRegion *mr)
1030 {
1031     if (int128_eq(mr->size, int128_2_64())) {
1032         return UINT64_MAX;
1033     }
1034     return int128_get64(mr->size);
1035 }
1036
1037 const char *memory_region_name(MemoryRegion *mr)
1038 {
1039     return mr->name;
1040 }
1041
1042 bool memory_region_is_ram(MemoryRegion *mr)
1043 {
1044     return mr->ram;
1045 }
1046
1047 bool memory_region_is_logging(MemoryRegion *mr)
1048 {
1049     return mr->dirty_log_mask;
1050 }
1051
1052 bool memory_region_is_rom(MemoryRegion *mr)
1053 {
1054     return mr->ram && mr->readonly;
1055 }
1056
1057 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
1058 {
1059     uint8_t mask = 1 << client;
1060
1061     memory_region_transaction_begin();
1062     mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
1063     memory_region_transaction_commit();
1064 }
1065
1066 bool memory_region_get_dirty(MemoryRegion *mr, hwaddr addr,
1067                              hwaddr size, unsigned client)
1068 {
1069     assert(mr->terminates);
1070     return cpu_physical_memory_get_dirty(mr->ram_addr + addr, size,
1071                                          1 << client);
1072 }
1073
1074 void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,
1075                              hwaddr size)
1076 {
1077     assert(mr->terminates);
1078     return cpu_physical_memory_set_dirty_range(mr->ram_addr + addr, size, -1);
1079 }
1080
1081 void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
1082 {
1083     AddressSpace *as;
1084     FlatRange *fr;
1085
1086     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1087         FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1088             if (fr->mr == mr) {
1089                 MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1090             }
1091         }
1092     }
1093 }
1094
1095 void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
1096 {
1097     if (mr->readonly != readonly) {
1098         memory_region_transaction_begin();
1099         mr->readonly = readonly;
1100         memory_region_transaction_commit();
1101     }
1102 }
1103
1104 void memory_region_rom_device_set_readable(MemoryRegion *mr, bool readable)
1105 {
1106     if (mr->readable != readable) {
1107         memory_region_transaction_begin();
1108         mr->readable = readable;
1109         memory_region_transaction_commit();
1110     }
1111 }
1112
1113 void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
1114                                hwaddr size, unsigned client)
1115 {
1116     assert(mr->terminates);
1117     cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
1118                                     mr->ram_addr + addr + size,
1119                                     1 << client);
1120 }
1121
1122 void *memory_region_get_ram_ptr(MemoryRegion *mr)
1123 {
1124     if (mr->alias) {
1125         return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset;
1126     }
1127
1128     assert(mr->terminates);
1129
1130     return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
1131 }
1132
1133 static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as)
1134 {
1135     FlatRange *fr;
1136     CoalescedMemoryRange *cmr;
1137     AddrRange tmp;
1138     MemoryRegionSection section;
1139
1140     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1141         if (fr->mr == mr) {
1142             section = (MemoryRegionSection) {
1143                 .address_space = as,
1144                 .offset_within_address_space = int128_get64(fr->addr.start),
1145                 .size = int128_get64(fr->addr.size),
1146             };
1147
1148             MEMORY_LISTENER_CALL(coalesced_mmio_del, Reverse, &section,
1149                                  int128_get64(fr->addr.start),
1150                                  int128_get64(fr->addr.size));
1151             QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
1152                 tmp = addrrange_shift(cmr->addr,
1153                                       int128_sub(fr->addr.start,
1154                                                  int128_make64(fr->offset_in_region)));
1155                 if (!addrrange_intersects(tmp, fr->addr)) {
1156                     continue;
1157                 }
1158                 tmp = addrrange_intersection(tmp, fr->addr);
1159                 MEMORY_LISTENER_CALL(coalesced_mmio_add, Forward, &section,
1160                                      int128_get64(tmp.start),
1161                                      int128_get64(tmp.size));
1162             }
1163         }
1164     }
1165 }
1166
1167 static void memory_region_update_coalesced_range(MemoryRegion *mr)
1168 {
1169     AddressSpace *as;
1170
1171     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1172         memory_region_update_coalesced_range_as(mr, as);
1173     }
1174 }
1175
1176 void memory_region_set_coalescing(MemoryRegion *mr)
1177 {
1178     memory_region_clear_coalescing(mr);
1179     memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
1180 }
1181
1182 void memory_region_add_coalescing(MemoryRegion *mr,
1183                                   hwaddr offset,
1184                                   uint64_t size)
1185 {
1186     CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
1187
1188     cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
1189     QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
1190     memory_region_update_coalesced_range(mr);
1191     memory_region_set_flush_coalesced(mr);
1192 }
1193
1194 void memory_region_clear_coalescing(MemoryRegion *mr)
1195 {
1196     CoalescedMemoryRange *cmr;
1197
1198     qemu_flush_coalesced_mmio_buffer();
1199     mr->flush_coalesced_mmio = false;
1200
1201     while (!QTAILQ_EMPTY(&mr->coalesced)) {
1202         cmr = QTAILQ_FIRST(&mr->coalesced);
1203         QTAILQ_REMOVE(&mr->coalesced, cmr, link);
1204         g_free(cmr);
1205     }
1206     memory_region_update_coalesced_range(mr);
1207 }
1208
1209 void memory_region_set_flush_coalesced(MemoryRegion *mr)
1210 {
1211     mr->flush_coalesced_mmio = true;
1212 }
1213
1214 void memory_region_clear_flush_coalesced(MemoryRegion *mr)
1215 {
1216     qemu_flush_coalesced_mmio_buffer();
1217     if (QTAILQ_EMPTY(&mr->coalesced)) {
1218         mr->flush_coalesced_mmio = false;
1219     }
1220 }
1221
1222 void memory_region_add_eventfd(MemoryRegion *mr,
1223                                hwaddr addr,
1224                                unsigned size,
1225                                bool match_data,
1226                                uint64_t data,
1227                                EventNotifier *e)
1228 {
1229     MemoryRegionIoeventfd mrfd = {
1230         .addr.start = int128_make64(addr),
1231         .addr.size = int128_make64(size),
1232         .match_data = match_data,
1233         .data = data,
1234         .e = e,
1235     };
1236     unsigned i;
1237
1238     adjust_endianness(mr, &mrfd.data, size);
1239     memory_region_transaction_begin();
1240     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1241         if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
1242             break;
1243         }
1244     }
1245     ++mr->ioeventfd_nb;
1246     mr->ioeventfds = g_realloc(mr->ioeventfds,
1247                                   sizeof(*mr->ioeventfds) * mr->ioeventfd_nb);
1248     memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i],
1249             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i));
1250     mr->ioeventfds[i] = mrfd;
1251     memory_region_transaction_commit();
1252 }
1253
1254 void memory_region_del_eventfd(MemoryRegion *mr,
1255                                hwaddr addr,
1256                                unsigned size,
1257                                bool match_data,
1258                                uint64_t data,
1259                                EventNotifier *e)
1260 {
1261     MemoryRegionIoeventfd mrfd = {
1262         .addr.start = int128_make64(addr),
1263         .addr.size = int128_make64(size),
1264         .match_data = match_data,
1265         .data = data,
1266         .e = e,
1267     };
1268     unsigned i;
1269
1270     adjust_endianness(mr, &mrfd.data, size);
1271     memory_region_transaction_begin();
1272     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1273         if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {
1274             break;
1275         }
1276     }
1277     assert(i != mr->ioeventfd_nb);
1278     memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1],
1279             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1)));
1280     --mr->ioeventfd_nb;
1281     mr->ioeventfds = g_realloc(mr->ioeventfds,
1282                                   sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1);
1283     memory_region_transaction_commit();
1284 }
1285
1286 static void memory_region_add_subregion_common(MemoryRegion *mr,
1287                                                hwaddr offset,
1288                                                MemoryRegion *subregion)
1289 {
1290     MemoryRegion *other;
1291
1292     memory_region_transaction_begin();
1293
1294     assert(!subregion->parent);
1295     subregion->parent = mr;
1296     subregion->addr = offset;
1297     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1298         if (subregion->may_overlap || other->may_overlap) {
1299             continue;
1300         }
1301         if (int128_gt(int128_make64(offset),
1302                       int128_add(int128_make64(other->addr), other->size))
1303             || int128_le(int128_add(int128_make64(offset), subregion->size),
1304                          int128_make64(other->addr))) {
1305             continue;
1306         }
1307 #if 0
1308         printf("warning: subregion collision %llx/%llx (%s) "
1309                "vs %llx/%llx (%s)\n",
1310                (unsigned long long)offset,
1311                (unsigned long long)int128_get64(subregion->size),
1312                subregion->name,
1313                (unsigned long long)other->addr,
1314                (unsigned long long)int128_get64(other->size),
1315                other->name);
1316 #endif
1317     }
1318     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1319         if (subregion->priority >= other->priority) {
1320             QTAILQ_INSERT_BEFORE(other, subregion, subregions_link);
1321             goto done;
1322         }
1323     }
1324     QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link);
1325 done:
1326     memory_region_transaction_commit();
1327 }
1328
1329
1330 void memory_region_add_subregion(MemoryRegion *mr,
1331                                  hwaddr offset,
1332                                  MemoryRegion *subregion)
1333 {
1334     subregion->may_overlap = false;
1335     subregion->priority = 0;
1336     memory_region_add_subregion_common(mr, offset, subregion);
1337 }
1338
1339 void memory_region_add_subregion_overlap(MemoryRegion *mr,
1340                                          hwaddr offset,
1341                                          MemoryRegion *subregion,
1342                                          unsigned priority)
1343 {
1344     subregion->may_overlap = true;
1345     subregion->priority = priority;
1346     memory_region_add_subregion_common(mr, offset, subregion);
1347 }
1348
1349 void memory_region_del_subregion(MemoryRegion *mr,
1350                                  MemoryRegion *subregion)
1351 {
1352     memory_region_transaction_begin();
1353     assert(subregion->parent == mr);
1354     subregion->parent = NULL;
1355     QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
1356     memory_region_transaction_commit();
1357 }
1358
1359 void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
1360 {
1361     if (enabled == mr->enabled) {
1362         return;
1363     }
1364     memory_region_transaction_begin();
1365     mr->enabled = enabled;
1366     memory_region_transaction_commit();
1367 }
1368
1369 void memory_region_set_address(MemoryRegion *mr, hwaddr addr)
1370 {
1371     MemoryRegion *parent = mr->parent;
1372     unsigned priority = mr->priority;
1373     bool may_overlap = mr->may_overlap;
1374
1375     if (addr == mr->addr || !parent) {
1376         mr->addr = addr;
1377         return;
1378     }
1379
1380     memory_region_transaction_begin();
1381     memory_region_del_subregion(parent, mr);
1382     if (may_overlap) {
1383         memory_region_add_subregion_overlap(parent, addr, mr, priority);
1384     } else {
1385         memory_region_add_subregion(parent, addr, mr);
1386     }
1387     memory_region_transaction_commit();
1388 }
1389
1390 void memory_region_set_alias_offset(MemoryRegion *mr, hwaddr offset)
1391 {
1392     assert(mr->alias);
1393
1394     if (offset == mr->alias_offset) {
1395         return;
1396     }
1397
1398     memory_region_transaction_begin();
1399     mr->alias_offset = offset;
1400     memory_region_transaction_commit();
1401 }
1402
1403 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
1404 {
1405     return mr->ram_addr;
1406 }
1407
1408 static int cmp_flatrange_addr(const void *addr_, const void *fr_)
1409 {
1410     const AddrRange *addr = addr_;
1411     const FlatRange *fr = fr_;
1412
1413     if (int128_le(addrrange_end(*addr), fr->addr.start)) {
1414         return -1;
1415     } else if (int128_ge(addr->start, addrrange_end(fr->addr))) {
1416         return 1;
1417     }
1418     return 0;
1419 }
1420
1421 static FlatRange *address_space_lookup(AddressSpace *as, AddrRange addr)
1422 {
1423     return bsearch(&addr, as->current_map->ranges, as->current_map->nr,
1424                    sizeof(FlatRange), cmp_flatrange_addr);
1425 }
1426
1427 MemoryRegionSection memory_region_find(MemoryRegion *address_space,
1428                                        hwaddr addr, uint64_t size)
1429 {
1430     AddressSpace *as = memory_region_to_address_space(address_space);
1431     AddrRange range = addrrange_make(int128_make64(addr),
1432                                      int128_make64(size));
1433     FlatRange *fr = address_space_lookup(as, range);
1434     MemoryRegionSection ret = { .mr = NULL, .size = 0 };
1435
1436     if (!fr) {
1437         return ret;
1438     }
1439
1440     while (fr > as->current_map->ranges
1441            && addrrange_intersects(fr[-1].addr, range)) {
1442         --fr;
1443     }
1444
1445     ret.mr = fr->mr;
1446     range = addrrange_intersection(range, fr->addr);
1447     ret.offset_within_region = fr->offset_in_region;
1448     ret.offset_within_region += int128_get64(int128_sub(range.start,
1449                                                         fr->addr.start));
1450     ret.size = int128_get64(range.size);
1451     ret.offset_within_address_space = int128_get64(range.start);
1452     ret.readonly = fr->readonly;
1453     return ret;
1454 }
1455
1456 void memory_global_sync_dirty_bitmap(MemoryRegion *address_space)
1457 {
1458     AddressSpace *as = memory_region_to_address_space(address_space);
1459     FlatRange *fr;
1460
1461     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1462         MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1463     }
1464 }
1465
1466 void memory_global_dirty_log_start(void)
1467 {
1468     global_dirty_log = true;
1469     MEMORY_LISTENER_CALL_GLOBAL(log_global_start, Forward);
1470 }
1471
1472 void memory_global_dirty_log_stop(void)
1473 {
1474     global_dirty_log = false;
1475     MEMORY_LISTENER_CALL_GLOBAL(log_global_stop, Reverse);
1476 }
1477
1478 static void listener_add_address_space(MemoryListener *listener,
1479                                        AddressSpace *as)
1480 {
1481     FlatRange *fr;
1482
1483     if (listener->address_space_filter
1484         && listener->address_space_filter != as) {
1485         return;
1486     }
1487
1488     if (global_dirty_log) {
1489         if (listener->log_global_start) {
1490             listener->log_global_start(listener);
1491         }
1492     }
1493
1494     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1495         MemoryRegionSection section = {
1496             .mr = fr->mr,
1497             .address_space = as,
1498             .offset_within_region = fr->offset_in_region,
1499             .size = int128_get64(fr->addr.size),
1500             .offset_within_address_space = int128_get64(fr->addr.start),
1501             .readonly = fr->readonly,
1502         };
1503         if (listener->region_add) {
1504             listener->region_add(listener, &section);
1505         }
1506     }
1507 }
1508
1509 void memory_listener_register(MemoryListener *listener, AddressSpace *filter)
1510 {
1511     MemoryListener *other = NULL;
1512     AddressSpace *as;
1513
1514     listener->address_space_filter = filter;
1515     if (QTAILQ_EMPTY(&memory_listeners)
1516         || listener->priority >= QTAILQ_LAST(&memory_listeners,
1517                                              memory_listeners)->priority) {
1518         QTAILQ_INSERT_TAIL(&memory_listeners, listener, link);
1519     } else {
1520         QTAILQ_FOREACH(other, &memory_listeners, link) {
1521             if (listener->priority < other->priority) {
1522                 break;
1523             }
1524         }
1525         QTAILQ_INSERT_BEFORE(other, listener, link);
1526     }
1527
1528     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1529         listener_add_address_space(listener, as);
1530     }
1531 }
1532
1533 void memory_listener_unregister(MemoryListener *listener)
1534 {
1535     QTAILQ_REMOVE(&memory_listeners, listener, link);
1536 }
1537
1538 void address_space_init(AddressSpace *as, MemoryRegion *root)
1539 {
1540     memory_region_transaction_begin();
1541     as->root = root;
1542     as->current_map = g_new(FlatView, 1);
1543     flatview_init(as->current_map);
1544     QTAILQ_INSERT_TAIL(&address_spaces, as, address_spaces_link);
1545     as->name = NULL;
1546     memory_region_transaction_commit();
1547     address_space_init_dispatch(as);
1548 }
1549
1550 void address_space_destroy(AddressSpace *as)
1551 {
1552     /* Flush out anything from MemoryListeners listening in on this */
1553     memory_region_transaction_begin();
1554     as->root = NULL;
1555     memory_region_transaction_commit();
1556     QTAILQ_REMOVE(&address_spaces, as, address_spaces_link);
1557     address_space_destroy_dispatch(as);
1558     flatview_destroy(as->current_map);
1559     g_free(as->current_map);
1560 }
1561
1562 uint64_t io_mem_read(MemoryRegion *mr, hwaddr addr, unsigned size)
1563 {
1564     return memory_region_dispatch_read(mr, addr, size);
1565 }
1566
1567 void io_mem_write(MemoryRegion *mr, hwaddr addr,
1568                   uint64_t val, unsigned size)
1569 {
1570     memory_region_dispatch_write(mr, addr, val, size);
1571 }
1572
1573 typedef struct MemoryRegionList MemoryRegionList;
1574
1575 struct MemoryRegionList {
1576     const MemoryRegion *mr;
1577     bool printed;
1578     QTAILQ_ENTRY(MemoryRegionList) queue;
1579 };
1580
1581 typedef QTAILQ_HEAD(queue, MemoryRegionList) MemoryRegionListHead;
1582
1583 static void mtree_print_mr(fprintf_function mon_printf, void *f,
1584                            const MemoryRegion *mr, unsigned int level,
1585                            hwaddr base,
1586                            MemoryRegionListHead *alias_print_queue)
1587 {
1588     MemoryRegionList *new_ml, *ml, *next_ml;
1589     MemoryRegionListHead submr_print_queue;
1590     const MemoryRegion *submr;
1591     unsigned int i;
1592
1593     if (!mr) {
1594         return;
1595     }
1596
1597     for (i = 0; i < level; i++) {
1598         mon_printf(f, "  ");
1599     }
1600
1601     if (mr->alias) {
1602         MemoryRegionList *ml;
1603         bool found = false;
1604
1605         /* check if the alias is already in the queue */
1606         QTAILQ_FOREACH(ml, alias_print_queue, queue) {
1607             if (ml->mr == mr->alias && !ml->printed) {
1608                 found = true;
1609             }
1610         }
1611
1612         if (!found) {
1613             ml = g_new(MemoryRegionList, 1);
1614             ml->mr = mr->alias;
1615             ml->printed = false;
1616             QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue);
1617         }
1618         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx
1619                    " (prio %d, %c%c): alias %s @%s " TARGET_FMT_plx
1620                    "-" TARGET_FMT_plx "\n",
1621                    base + mr->addr,
1622                    base + mr->addr
1623                    + (hwaddr)int128_get64(mr->size) - 1,
1624                    mr->priority,
1625                    mr->readable ? 'R' : '-',
1626                    !mr->readonly && !(mr->rom_device && mr->readable) ? 'W'
1627                                                                       : '-',
1628                    mr->name,
1629                    mr->alias->name,
1630                    mr->alias_offset,
1631                    mr->alias_offset
1632                    + (hwaddr)int128_get64(mr->size) - 1);
1633     } else {
1634         mon_printf(f,
1635                    TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d, %c%c): %s\n",
1636                    base + mr->addr,
1637                    base + mr->addr
1638                    + (hwaddr)int128_get64(mr->size) - 1,
1639                    mr->priority,
1640                    mr->readable ? 'R' : '-',
1641                    !mr->readonly && !(mr->rom_device && mr->readable) ? 'W'
1642                                                                       : '-',
1643                    mr->name);
1644     }
1645
1646     QTAILQ_INIT(&submr_print_queue);
1647
1648     QTAILQ_FOREACH(submr, &mr->subregions, subregions_link) {
1649         new_ml = g_new(MemoryRegionList, 1);
1650         new_ml->mr = submr;
1651         QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1652             if (new_ml->mr->addr < ml->mr->addr ||
1653                 (new_ml->mr->addr == ml->mr->addr &&
1654                  new_ml->mr->priority > ml->mr->priority)) {
1655                 QTAILQ_INSERT_BEFORE(ml, new_ml, queue);
1656                 new_ml = NULL;
1657                 break;
1658             }
1659         }
1660         if (new_ml) {
1661             QTAILQ_INSERT_TAIL(&submr_print_queue, new_ml, queue);
1662         }
1663     }
1664
1665     QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1666         mtree_print_mr(mon_printf, f, ml->mr, level + 1, base + mr->addr,
1667                        alias_print_queue);
1668     }
1669
1670     QTAILQ_FOREACH_SAFE(ml, &submr_print_queue, queue, next_ml) {
1671         g_free(ml);
1672     }
1673 }
1674
1675 void mtree_info(fprintf_function mon_printf, void *f)
1676 {
1677     MemoryRegionListHead ml_head;
1678     MemoryRegionList *ml, *ml2;
1679     AddressSpace *as;
1680
1681     QTAILQ_INIT(&ml_head);
1682
1683     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1684         if (!as->name) {
1685             continue;
1686         }
1687         mon_printf(f, "%s\n", as->name);
1688         mtree_print_mr(mon_printf, f, as->root, 0, 0, &ml_head);
1689     }
1690
1691     mon_printf(f, "aliases\n");
1692     /* print aliased regions */
1693     QTAILQ_FOREACH(ml, &ml_head, queue) {
1694         if (!ml->printed) {
1695             mon_printf(f, "%s\n", ml->mr->name);
1696             mtree_print_mr(mon_printf, f, ml->mr, 0, 0, &ml_head);
1697         }
1698     }
1699
1700     QTAILQ_FOREACH_SAFE(ml, &ml_head, queue, ml2) {
1701         g_free(ml);
1702     }
1703 }