memory.c

   1 /*
   2  * Physical memory management
   3  *
   4  * Copyright 2011 Red Hat, Inc. and/or its affiliates
   5  *
   6  * Authors:
   7  *  Avi Kivity <[email protected]>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Contributions after 2012-01-13 are licensed under the terms of the
  13  * GNU GPL, version 2 or (at your option) any later version.
  14  */
  15
  16 #include "exec/memory.h"
  17 #include "exec/address-spaces.h"
  18 #include "exec/ioport.h"
  19 #include "qemu/bitops.h"
  20 #include "sysemu/kvm.h"
  21 #include <assert.h>
  22
  23 #include "exec/memory-internal.h"
  24
  25 //#define DEBUG_UNASSIGNED
  26
  27 static unsigned memory_region_transaction_depth;
  28 static bool memory_region_update_pending;
  29 static bool global_dirty_log = false;
  30
  31 static QTAILQ_HEAD(memory_listeners, MemoryListener) memory_listeners
  32     = QTAILQ_HEAD_INITIALIZER(memory_listeners);
  33
  34 static QTAILQ_HEAD(, AddressSpace) address_spaces
  35     = QTAILQ_HEAD_INITIALIZER(address_spaces);
  36
  37 typedef struct AddrRange AddrRange;
  38
  39 /*
  40  * Note using signed integers limits us to physical addresses at most
  41  * 63 bits wide.  They are needed for negative offsetting in aliases
  42  * (large MemoryRegion::alias_offset).
  43  */
  44 struct AddrRange {
  45     Int128 start;
  46     Int128 size;
  47 };
  48
  49 static AddrRange addrrange_make(Int128 start, Int128 size)
  50 {
  51     return (AddrRange) { start, size };
  52 }
  53
  54 static bool addrrange_equal(AddrRange r1, AddrRange r2)
  55 {
  56     return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
  57 }
  58
  59 static Int128 addrrange_end(AddrRange r)
  60 {
  61     return int128_add(r.start, r.size);
  62 }
  63
  64 static AddrRange addrrange_shift(AddrRange range, Int128 delta)
  65 {
  66     int128_addto(&range.start, delta);
  67     return range;
  68 }
  69
  70 static bool addrrange_contains(AddrRange range, Int128 addr)
  71 {
  72     return int128_ge(addr, range.start)
  73         && int128_lt(addr, addrrange_end(range));
  74 }
  75
  76 static bool addrrange_intersects(AddrRange r1, AddrRange r2)
  77 {
  78     return addrrange_contains(r1, r2.start)
  79         || addrrange_contains(r2, r1.start);
  80 }
  81
  82 static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
  83 {
  84     Int128 start = int128_max(r1.start, r2.start);
  85     Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
  86     return addrrange_make(start, int128_sub(end, start));
  87 }
  88
  89 enum ListenerDirection { Forward, Reverse };
  90
  91 static bool memory_listener_match(MemoryListener *listener,
  92                                   MemoryRegionSection *section)
  93 {
  94     return !listener->address_space_filter
  95         || listener->address_space_filter == section->address_space;
  96 }
  97
  98 #define MEMORY_LISTENER_CALL_GLOBAL(_callback, _direction, _args...)    \
  99     do {                                                                \
 100         MemoryListener *_listener;                                      \
 101                                                                         \
 102         switch (_direction) {                                           \
 103         case Forward:                                                   \
 104             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 105                 if (_listener->_callback) {                             \
 106                     _listener->_callback(_listener, ##_args);           \
 107                 }                                                       \
 108             }                                                           \
 109             break;                                                      \
 110         case Reverse:                                                   \
 111             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 112                                    memory_listeners, link) {            \
 113                 if (_listener->_callback) {                             \
 114                     _listener->_callback(_listener, ##_args);           \
 115                 }                                                       \
 116             }                                                           \
 117             break;                                                      \
 118         default:                                                        \
 119             abort();                                                    \
 120         }                                                               \
 121     } while (0)
 122
 123 #define MEMORY_LISTENER_CALL(_callback, _direction, _section, _args...) \
 124     do {                                                                \
 125         MemoryListener *_listener;                                      \
 126                                                                         \
 127         switch (_direction) {                                           \
 128         case Forward:                                                   \
 129             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 130                 if (_listener->_callback                                \
 131                     && memory_listener_match(_listener, _section)) {    \
 132                     _listener->_callback(_listener, _section, ##_args); \
 133                 }                                                       \
 134             }                                                           \
 135             break;                                                      \
 136         case Reverse:                                                   \
 137             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 138                                    memory_listeners, link) {            \
 139                 if (_listener->_callback                                \
 140                     && memory_listener_match(_listener, _section)) {    \
 141                     _listener->_callback(_listener, _section, ##_args); \
 142                 }                                                       \
 143             }                                                           \
 144             break;                                                      \
 145         default:                                                        \
 146             abort();                                                    \
 147         }                                                               \
 148     } while (0)
 149
 150 #define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback)            \
 151     MEMORY_LISTENER_CALL(callback, dir, (&(MemoryRegionSection) {       \
 152         .mr = (fr)->mr,                                                 \
 153         .address_space = (as),                                          \
 154         .offset_within_region = (fr)->offset_in_region,                 \
 155         .size = (fr)->addr.size,                                        \
 156         .offset_within_address_space = int128_get64((fr)->addr.start),  \
 157         .readonly = (fr)->readonly,                                     \
 158               }))
 159
 160 struct CoalescedMemoryRange {
 161     AddrRange addr;
 162     QTAILQ_ENTRY(CoalescedMemoryRange) link;
 163 };
 164
 165 struct MemoryRegionIoeventfd {
 166     AddrRange addr;
 167     bool match_data;
 168     uint64_t data;
 169     EventNotifier *e;
 170 };
 171
 172 static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
 173                                            MemoryRegionIoeventfd b)
 174 {
 175     if (int128_lt(a.addr.start, b.addr.start)) {
 176         return true;
 177     } else if (int128_gt(a.addr.start, b.addr.start)) {
 178         return false;
 179     } else if (int128_lt(a.addr.size, b.addr.size)) {
 180         return true;
 181     } else if (int128_gt(a.addr.size, b.addr.size)) {
 182         return false;
 183     } else if (a.match_data < b.match_data) {
 184         return true;
 185     } else  if (a.match_data > b.match_data) {
 186         return false;
 187     } else if (a.match_data) {
 188         if (a.data < b.data) {
 189             return true;
 190         } else if (a.data > b.data) {
 191             return false;
 192         }
 193     }
 194     if (a.e < b.e) {
 195         return true;
 196     } else if (a.e > b.e) {
 197         return false;
 198     }
 199     return false;
 200 }
 201
 202 static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
 203                                           MemoryRegionIoeventfd b)
 204 {
 205     return !memory_region_ioeventfd_before(a, b)
 206         && !memory_region_ioeventfd_before(b, a);
 207 }
 208
 209 typedef struct FlatRange FlatRange;
 210 typedef struct FlatView FlatView;
 211
 212 /* Range of memory in the global map.  Addresses are absolute. */
 213 struct FlatRange {
 214     MemoryRegion *mr;
 215     hwaddr offset_in_region;
 216     AddrRange addr;
 217     uint8_t dirty_log_mask;
 218     bool romd_mode;
 219     bool readonly;
 220 };
 221
 222 /* Flattened global view of current active memory hierarchy.  Kept in sorted
 223  * order.
 224  */
 225 struct FlatView {
 226     FlatRange *ranges;
 227     unsigned nr;
 228     unsigned nr_allocated;
 229 };
 230
 231 typedef struct AddressSpaceOps AddressSpaceOps;
 232
 233 #define FOR_EACH_FLAT_RANGE(var, view)          \
 234     for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
 235
 236 static bool flatrange_equal(FlatRange *a, FlatRange *b)
 237 {
 238     return a->mr == b->mr
 239         && addrrange_equal(a->addr, b->addr)
 240         && a->offset_in_region == b->offset_in_region
 241         && a->romd_mode == b->romd_mode
 242         && a->readonly == b->readonly;
 243 }
 244
 245 static void flatview_init(FlatView *view)
 246 {
 247     view->ranges = NULL;
 248     view->nr = 0;
 249     view->nr_allocated = 0;
 250 }
 251
 252 /* Insert a range into a given position.  Caller is responsible for maintaining
 253  * sorting order.
 254  */
 255 static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range)
 256 {
 257     if (view->nr == view->nr_allocated) {
 258         view->nr_allocated = MAX(2 * view->nr, 10);
 259         view->ranges = g_realloc(view->ranges,
 260                                     view->nr_allocated * sizeof(*view->ranges));
 261     }
 262     memmove(view->ranges + pos + 1, view->ranges + pos,
 263             (view->nr - pos) * sizeof(FlatRange));
 264     view->ranges[pos] = *range;
 265     ++view->nr;
 266 }
 267
 268 static void flatview_destroy(FlatView *view)
 269 {
 270     g_free(view->ranges);
 271 }
 272
 273 static bool can_merge(FlatRange *r1, FlatRange *r2)
 274 {
 275     return int128_eq(addrrange_end(r1->addr), r2->addr.start)
 276         && r1->mr == r2->mr
 277         && int128_eq(int128_add(int128_make64(r1->offset_in_region),
 278                                 r1->addr.size),
 279                      int128_make64(r2->offset_in_region))
 280         && r1->dirty_log_mask == r2->dirty_log_mask
 281         && r1->romd_mode == r2->romd_mode
 282         && r1->readonly == r2->readonly;
 283 }
 284
 285 /* Attempt to simplify a view by merging adjacent ranges */
 286 static void flatview_simplify(FlatView *view)
 287 {
 288     unsigned i, j;
 289
 290     i = 0;
 291     while (i < view->nr) {
 292         j = i + 1;
 293         while (j < view->nr
 294                && can_merge(&view->ranges[j-1], &view->ranges[j])) {
 295             int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
 296             ++j;
 297         }
 298         ++i;
 299         memmove(&view->ranges[i], &view->ranges[j],
 300                 (view->nr - j) * sizeof(view->ranges[j]));
 301         view->nr -= j - i;
 302     }
 303 }
 304
 305 static void memory_region_oldmmio_read_accessor(void *opaque,
 306                                                 hwaddr addr,
 307                                                 uint64_t *value,
 308                                                 unsigned size,
 309                                                 unsigned shift,
 310                                                 uint64_t mask)
 311 {
 312     MemoryRegion *mr = opaque;
 313     uint64_t tmp;
 314
 315     tmp = mr->ops->old_mmio.read[ctz32(size)](mr->opaque, addr);
 316     *value |= (tmp & mask) << shift;
 317 }
 318
 319 static void memory_region_read_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 = mr->ops->read(mr->opaque, addr, size);
 333     *value |= (tmp & mask) << shift;
 334 }
 335
 336 static void memory_region_oldmmio_write_accessor(void *opaque,
 337                                                  hwaddr addr,
 338                                                  uint64_t *value,
 339                                                  unsigned size,
 340                                                  unsigned shift,
 341                                                  uint64_t mask)
 342 {
 343     MemoryRegion *mr = opaque;
 344     uint64_t tmp;
 345
 346     tmp = (*value >> shift) & mask;
 347     mr->ops->old_mmio.write[ctz32(size)](mr->opaque, addr, tmp);
 348 }
 349
 350 static void memory_region_write_accessor(void *opaque,
 351                                          hwaddr addr,
 352                                          uint64_t *value,
 353                                          unsigned size,
 354                                          unsigned shift,
 355                                          uint64_t mask)
 356 {
 357     MemoryRegion *mr = opaque;
 358     uint64_t tmp;
 359
 360     if (mr->flush_coalesced_mmio) {
 361         qemu_flush_coalesced_mmio_buffer();
 362     }
 363     tmp = (*value >> shift) & mask;
 364     mr->ops->write(mr->opaque, addr, tmp, size);
 365 }
 366
 367 static void access_with_adjusted_size(hwaddr addr,
 368                                       uint64_t *value,
 369                                       unsigned size,
 370                                       unsigned access_size_min,
 371                                       unsigned access_size_max,
 372                                       void (*access)(void *opaque,
 373                                                      hwaddr addr,
 374                                                      uint64_t *value,
 375                                                      unsigned size,
 376                                                      unsigned shift,
 377                                                      uint64_t mask),
 378                                       void *opaque)
 379 {
 380     uint64_t access_mask;
 381     unsigned access_size;
 382     unsigned i;
 383
 384     if (!access_size_min) {
 385         access_size_min = 1;
 386     }
 387     if (!access_size_max) {
 388         access_size_max = 4;
 389     }
 390
 391     /* FIXME: support unaligned access? */
 392     access_size = MAX(MIN(size, access_size_max), access_size_min);
 393     access_mask = -1ULL >> (64 - access_size * 8);
 394     for (i = 0; i < size; i += access_size) {
 395 #ifdef TARGET_WORDS_BIGENDIAN
 396         access(opaque, addr + i, value, access_size,
 397                (size - access_size - i) * 8, access_mask);
 398 #else
 399         access(opaque, addr + i, value, access_size, i * 8, access_mask);
 400 #endif
 401     }
 402 }
 403
 404 static const MemoryRegionPortio *find_portio(MemoryRegion *mr, uint64_t offset,
 405                                              unsigned width, bool write)
 406 {
 407     const MemoryRegionPortio *mrp;
 408
 409     for (mrp = mr->ops->old_portio; mrp->size; ++mrp) {
 410         if (offset >= mrp->offset && offset < mrp->offset + mrp->len
 411             && width == mrp->size
 412             && (write ? (bool)mrp->write : (bool)mrp->read)) {
 413             return mrp;
 414         }
 415     }
 416     return NULL;
 417 }
 418
 419 static void memory_region_iorange_read(IORange *iorange,
 420                                        uint64_t offset,
 421                                        unsigned width,
 422                                        uint64_t *data)
 423 {
 424     MemoryRegionIORange *mrio
 425         = container_of(iorange, MemoryRegionIORange, iorange);
 426     MemoryRegion *mr = mrio->mr;
 427
 428     offset += mrio->offset;
 429     if (mr->ops->old_portio) {
 430         const MemoryRegionPortio *mrp = find_portio(mr, offset - mrio->offset,
 431                                                     width, false);
 432
 433         *data = ((uint64_t)1 << (width * 8)) - 1;
 434         if (mrp) {
 435             *data = mrp->read(mr->opaque, offset);
 436         } else if (width == 2) {
 437             mrp = find_portio(mr, offset - mrio->offset, 1, false);
 438             assert(mrp);
 439             *data = mrp->read(mr->opaque, offset) |
 440                     (mrp->read(mr->opaque, offset + 1) << 8);
 441         }
 442         return;
 443     }
 444     *data = 0;
 445     access_with_adjusted_size(offset, data, width,
 446                               mr->ops->impl.min_access_size,
 447                               mr->ops->impl.max_access_size,
 448                               memory_region_read_accessor, mr);
 449 }
 450
 451 static void memory_region_iorange_write(IORange *iorange,
 452                                         uint64_t offset,
 453                                         unsigned width,
 454                                         uint64_t data)
 455 {
 456     MemoryRegionIORange *mrio
 457         = container_of(iorange, MemoryRegionIORange, iorange);
 458     MemoryRegion *mr = mrio->mr;
 459
 460     offset += mrio->offset;
 461     if (mr->ops->old_portio) {
 462         const MemoryRegionPortio *mrp = find_portio(mr, offset - mrio->offset,
 463                                                     width, true);
 464
 465         if (mrp) {
 466             mrp->write(mr->opaque, offset, data);
 467         } else if (width == 2) {
 468             mrp = find_portio(mr, offset - mrio->offset, 1, true);
 469             assert(mrp);
 470             mrp->write(mr->opaque, offset, data & 0xff);
 471             mrp->write(mr->opaque, offset + 1, data >> 8);
 472         }
 473         return;
 474     }
 475     access_with_adjusted_size(offset, &data, width,
 476                               mr->ops->impl.min_access_size,
 477                               mr->ops->impl.max_access_size,
 478                               memory_region_write_accessor, mr);
 479 }
 480
 481 static void memory_region_iorange_destructor(IORange *iorange)
 482 {
 483     g_free(container_of(iorange, MemoryRegionIORange, iorange));
 484 }
 485
 486 const IORangeOps memory_region_iorange_ops = {
 487     .read = memory_region_iorange_read,
 488     .write = memory_region_iorange_write,
 489     .destructor = memory_region_iorange_destructor,
 490 };
 491
 492 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
 493 {
 494     AddressSpace *as;
 495
 496     while (mr->parent) {
 497         mr = mr->parent;
 498     }
 499     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 500         if (mr == as->root) {
 501             return as;
 502         }
 503     }
 504     abort();
 505 }
 506
 507 /* Render a memory region into the global view.  Ranges in @view obscure
 508  * ranges in @mr.
 509  */
 510 static void render_memory_region(FlatView *view,
 511                                  MemoryRegion *mr,
 512                                  Int128 base,
 513                                  AddrRange clip,
 514                                  bool readonly)
 515 {
 516     MemoryRegion *subregion;
 517     unsigned i;
 518     hwaddr offset_in_region;
 519     Int128 remain;
 520     Int128 now;
 521     FlatRange fr;
 522     AddrRange tmp;
 523
 524     if (!mr->enabled) {
 525         return;
 526     }
 527
 528     int128_addto(&base, int128_make64(mr->addr));
 529     readonly |= mr->readonly;
 530
 531     tmp = addrrange_make(base, mr->size);
 532
 533     if (!addrrange_intersects(tmp, clip)) {
 534         return;
 535     }
 536
 537     clip = addrrange_intersection(tmp, clip);
 538
 539     if (mr->alias) {
 540         int128_subfrom(&base, int128_make64(mr->alias->addr));
 541         int128_subfrom(&base, int128_make64(mr->alias_offset));
 542         render_memory_region(view, mr->alias, base, clip, readonly);
 543         return;
 544     }
 545
 546     /* Render subregions in priority order. */
 547     QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) {
 548         render_memory_region(view, subregion, base, clip, readonly);
 549     }
 550
 551     if (!mr->terminates) {
 552         return;
 553     }
 554
 555     offset_in_region = int128_get64(int128_sub(clip.start, base));
 556     base = clip.start;
 557     remain = clip.size;
 558
 559     fr.mr = mr;
 560     fr.dirty_log_mask = mr->dirty_log_mask;
 561     fr.romd_mode = mr->romd_mode;
 562     fr.readonly = readonly;
 563
 564     /* Render the region itself into any gaps left by the current view. */
 565     for (i = 0; i < view->nr && int128_nz(remain); ++i) {
 566         if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
 567             continue;
 568         }
 569         if (int128_lt(base, view->ranges[i].addr.start)) {
 570             now = int128_min(remain,
 571                              int128_sub(view->ranges[i].addr.start, base));
 572             fr.offset_in_region = offset_in_region;
 573             fr.addr = addrrange_make(base, now);
 574             flatview_insert(view, i, &fr);
 575             ++i;
 576             int128_addto(&base, now);
 577             offset_in_region += int128_get64(now);
 578             int128_subfrom(&remain, now);
 579         }
 580         now = int128_sub(int128_min(int128_add(base, remain),
 581                                     addrrange_end(view->ranges[i].addr)),
 582                          base);
 583         int128_addto(&base, now);
 584         offset_in_region += int128_get64(now);
 585         int128_subfrom(&remain, now);
 586     }
 587     if (int128_nz(remain)) {
 588         fr.offset_in_region = offset_in_region;
 589         fr.addr = addrrange_make(base, remain);
 590         flatview_insert(view, i, &fr);
 591     }
 592 }
 593
 594 /* Render a memory topology into a list of disjoint absolute ranges. */
 595 static FlatView generate_memory_topology(MemoryRegion *mr)
 596 {
 597     FlatView view;
 598
 599     flatview_init(&view);
 600
 601     if (mr) {
 602         render_memory_region(&view, mr, int128_zero(),
 603                              addrrange_make(int128_zero(), int128_2_64()), false);
 604     }
 605     flatview_simplify(&view);
 606
 607     return view;
 608 }
 609
 610 static void address_space_add_del_ioeventfds(AddressSpace *as,
 611                                              MemoryRegionIoeventfd *fds_new,
 612                                              unsigned fds_new_nb,
 613                                              MemoryRegionIoeventfd *fds_old,
 614                                              unsigned fds_old_nb)
 615 {
 616     unsigned iold, inew;
 617     MemoryRegionIoeventfd *fd;
 618     MemoryRegionSection section;
 619
 620     /* Generate a symmetric difference of the old and new fd sets, adding
 621      * and deleting as necessary.
 622      */
 623
 624     iold = inew = 0;
 625     while (iold < fds_old_nb || inew < fds_new_nb) {
 626         if (iold < fds_old_nb
 627             && (inew == fds_new_nb
 628                 || memory_region_ioeventfd_before(fds_old[iold],
 629                                                   fds_new[inew]))) {
 630             fd = &fds_old[iold];
 631             section = (MemoryRegionSection) {
 632                 .address_space = as,
 633                 .offset_within_address_space = int128_get64(fd->addr.start),
 634                 .size = fd->addr.size,
 635             };
 636             MEMORY_LISTENER_CALL(eventfd_del, Forward, &section,
 637                                  fd->match_data, fd->data, fd->e);
 638             ++iold;
 639         } else if (inew < fds_new_nb
 640                    && (iold == fds_old_nb
 641                        || memory_region_ioeventfd_before(fds_new[inew],
 642                                                          fds_old[iold]))) {
 643             fd = &fds_new[inew];
 644             section = (MemoryRegionSection) {
 645                 .address_space = as,
 646                 .offset_within_address_space = int128_get64(fd->addr.start),
 647                 .size = fd->addr.size,
 648             };
 649             MEMORY_LISTENER_CALL(eventfd_add, Reverse, &section,
 650                                  fd->match_data, fd->data, fd->e);
 651             ++inew;
 652         } else {
 653             ++iold;
 654             ++inew;
 655         }
 656     }
 657 }
 658
 659 static void address_space_update_ioeventfds(AddressSpace *as)
 660 {
 661     FlatRange *fr;
 662     unsigned ioeventfd_nb = 0;
 663     MemoryRegionIoeventfd *ioeventfds = NULL;
 664     AddrRange tmp;
 665     unsigned i;
 666
 667     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
 668         for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
 669             tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
 670                                   int128_sub(fr->addr.start,
 671                                              int128_make64(fr->offset_in_region)));
 672             if (addrrange_intersects(fr->addr, tmp)) {
 673                 ++ioeventfd_nb;
 674                 ioeventfds = g_realloc(ioeventfds,
 675                                           ioeventfd_nb * sizeof(*ioeventfds));
 676                 ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i];
 677                 ioeventfds[ioeventfd_nb-1].addr = tmp;
 678             }
 679         }
 680     }
 681
 682     address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb,
 683                                      as->ioeventfds, as->ioeventfd_nb);
 684
 685     g_free(as->ioeventfds);
 686     as->ioeventfds = ioeventfds;
 687     as->ioeventfd_nb = ioeventfd_nb;
 688 }
 689
 690 static void address_space_update_topology_pass(AddressSpace *as,
 691                                                FlatView old_view,
 692                                                FlatView new_view,
 693                                                bool adding)
 694 {
 695     unsigned iold, inew;
 696     FlatRange *frold, *frnew;
 697
 698     /* Generate a symmetric difference of the old and new memory maps.
 699      * Kill ranges in the old map, and instantiate ranges in the new map.
 700      */
 701     iold = inew = 0;
 702     while (iold < old_view.nr || inew < new_view.nr) {
 703         if (iold < old_view.nr) {
 704             frold = &old_view.ranges[iold];
 705         } else {
 706             frold = NULL;
 707         }
 708         if (inew < new_view.nr) {
 709             frnew = &new_view.ranges[inew];
 710         } else {
 711             frnew = NULL;
 712         }
 713
 714         if (frold
 715             && (!frnew
 716                 || int128_lt(frold->addr.start, frnew->addr.start)
 717                 || (int128_eq(frold->addr.start, frnew->addr.start)
 718                     && !flatrange_equal(frold, frnew)))) {
 719             /* In old but not in new, or in both but attributes changed. */
 720
 721             if (!adding) {
 722                 MEMORY_LISTENER_UPDATE_REGION(frold, as, Reverse, region_del);
 723             }
 724
 725             ++iold;
 726         } else if (frold && frnew && flatrange_equal(frold, frnew)) {
 727             /* In both and unchanged (except logging may have changed) */
 728
 729             if (adding) {
 730                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_nop);
 731                 if (frold->dirty_log_mask && !frnew->dirty_log_mask) {
 732                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Reverse, log_stop);
 733                 } else if (frnew->dirty_log_mask && !frold->dirty_log_mask) {
 734                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, log_start);
 735                 }
 736             }
 737
 738             ++iold;
 739             ++inew;
 740         } else {
 741             /* In new */
 742
 743             if (adding) {
 744                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_add);
 745             }
 746
 747             ++inew;
 748         }
 749     }
 750 }
 751
 752
 753 static void address_space_update_topology(AddressSpace *as)
 754 {
 755     FlatView old_view = *as->current_map;
 756     FlatView new_view = generate_memory_topology(as->root);
 757
 758     address_space_update_topology_pass(as, old_view, new_view, false);
 759     address_space_update_topology_pass(as, old_view, new_view, true);
 760
 761     *as->current_map = new_view;
 762     flatview_destroy(&old_view);
 763     address_space_update_ioeventfds(as);
 764 }
 765
 766 void memory_region_transaction_begin(void)
 767 {
 768     qemu_flush_coalesced_mmio_buffer();
 769     ++memory_region_transaction_depth;
 770 }
 771
 772 void memory_region_transaction_commit(void)
 773 {
 774     AddressSpace *as;
 775
 776     assert(memory_region_transaction_depth);
 777     --memory_region_transaction_depth;
 778     if (!memory_region_transaction_depth && memory_region_update_pending) {
 779         memory_region_update_pending = false;
 780         MEMORY_LISTENER_CALL_GLOBAL(begin, Forward);
 781
 782         QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 783             address_space_update_topology(as);
 784         }
 785
 786         MEMORY_LISTENER_CALL_GLOBAL(commit, Forward);
 787     }
 788 }
 789
 790 static void memory_region_destructor_none(MemoryRegion *mr)
 791 {
 792 }
 793
 794 static void memory_region_destructor_ram(MemoryRegion *mr)
 795 {
 796     qemu_ram_free(mr->ram_addr);
 797 }
 798
 799 static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
 800 {
 801     qemu_ram_free_from_ptr(mr->ram_addr);
 802 }
 803
 804 static void memory_region_destructor_rom_device(MemoryRegion *mr)
 805 {
 806     qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
 807 }
 808
 809 static bool memory_region_wrong_endianness(MemoryRegion *mr)
 810 {
 811 #ifdef TARGET_WORDS_BIGENDIAN
 812     return mr->ops->endianness == DEVICE_LITTLE_ENDIAN;
 813 #else
 814     return mr->ops->endianness == DEVICE_BIG_ENDIAN;
 815 #endif
 816 }
 817
 818 void memory_region_init(MemoryRegion *mr,
 819                         const char *name,
 820                         uint64_t size)
 821 {
 822     mr->ops = &unassigned_mem_ops;
 823     mr->opaque = NULL;
 824     mr->iommu_ops = NULL;
 825     mr->parent = NULL;
 826     mr->size = int128_make64(size);
 827     if (size == UINT64_MAX) {
 828         mr->size = int128_2_64();
 829     }
 830     mr->addr = 0;
 831     mr->subpage = false;
 832     mr->enabled = true;
 833     mr->terminates = false;
 834     mr->ram = false;
 835     mr->romd_mode = true;
 836     mr->readonly = false;
 837     mr->rom_device = false;
 838     mr->destructor = memory_region_destructor_none;
 839     mr->priority = 0;
 840     mr->may_overlap = false;
 841     mr->alias = NULL;
 842     QTAILQ_INIT(&mr->subregions);
 843     memset(&mr->subregions_link, 0, sizeof mr->subregions_link);
 844     QTAILQ_INIT(&mr->coalesced);
 845     mr->name = g_strdup(name);
 846     mr->dirty_log_mask = 0;
 847     mr->ioeventfd_nb = 0;
 848     mr->ioeventfds = NULL;
 849     mr->flush_coalesced_mmio = false;
 850 }
 851
 852 static uint64_t unassigned_mem_read(void *opaque, hwaddr addr,
 853                                     unsigned size)
 854 {
 855 #ifdef DEBUG_UNASSIGNED
 856     printf("Unassigned mem read " TARGET_FMT_plx "\n", addr);
 857 #endif
 858 #if defined(TARGET_ALPHA) || defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
 859     cpu_unassigned_access(cpu_single_env, addr, 0, 0, 0, size);
 860 #endif
 861     return 0;
 862 }
 863
 864 static void unassigned_mem_write(void *opaque, hwaddr addr,
 865                                  uint64_t val, unsigned size)
 866 {
 867 #ifdef DEBUG_UNASSIGNED
 868     printf("Unassigned mem write " TARGET_FMT_plx " = 0x%"PRIx64"\n", addr, val);
 869 #endif
 870 #if defined(TARGET_ALPHA) || defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
 871     cpu_unassigned_access(cpu_single_env, addr, 1, 0, 0, size);
 872 #endif
 873 }
 874
 875 static bool unassigned_mem_accepts(void *opaque, hwaddr addr,
 876                                    unsigned size, bool is_write)
 877 {
 878     return false;
 879 }
 880
 881 const MemoryRegionOps unassigned_mem_ops = {
 882     .valid.accepts = unassigned_mem_accepts,
 883     .endianness = DEVICE_NATIVE_ENDIAN,
 884 };
 885
 886 bool memory_region_access_valid(MemoryRegion *mr,
 887                                 hwaddr addr,
 888                                 unsigned size,
 889                                 bool is_write)
 890 {
 891     int access_size_min, access_size_max;
 892     int access_size, i;
 893
 894     if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
 895         return false;
 896     }
 897
 898     if (!mr->ops->valid.accepts) {
 899         return true;
 900     }
 901
 902     access_size_min = mr->ops->valid.min_access_size;
 903     if (!mr->ops->valid.min_access_size) {
 904         access_size_min = 1;
 905     }
 906
 907     access_size_max = mr->ops->valid.max_access_size;
 908     if (!mr->ops->valid.max_access_size) {
 909         access_size_max = 4;
 910     }
 911
 912     access_size = MAX(MIN(size, access_size_max), access_size_min);
 913     for (i = 0; i < size; i += access_size) {
 914         if (!mr->ops->valid.accepts(mr->opaque, addr + i, access_size,
 915                                     is_write)) {
 916             return false;
 917         }
 918     }
 919
 920     return true;
 921 }
 922
 923 static uint64_t memory_region_dispatch_read1(MemoryRegion *mr,
 924                                              hwaddr addr,
 925                                              unsigned size)
 926 {
 927     uint64_t data = 0;
 928
 929     if (mr->ops->read) {
 930         access_with_adjusted_size(addr, &data, size,
 931                                   mr->ops->impl.min_access_size,
 932                                   mr->ops->impl.max_access_size,
 933                                   memory_region_read_accessor, mr);
 934     } else {
 935         access_with_adjusted_size(addr, &data, size, 1, 4,
 936                                   memory_region_oldmmio_read_accessor, mr);
 937     }
 938
 939     return data;
 940 }
 941
 942 static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size)
 943 {
 944     if (memory_region_wrong_endianness(mr)) {
 945         switch (size) {
 946         case 1:
 947             break;
 948         case 2:
 949             *data = bswap16(*data);
 950             break;
 951         case 4:
 952             *data = bswap32(*data);
 953             break;
 954         case 8:
 955             *data = bswap64(*data);
 956             break;
 957         default:
 958             abort();
 959         }
 960     }
 961 }
 962
 963 static bool memory_region_dispatch_read(MemoryRegion *mr,
 964                                         hwaddr addr,
 965                                         uint64_t *pval,
 966                                         unsigned size)
 967 {
 968     if (!memory_region_access_valid(mr, addr, size, false)) {
 969         *pval = unassigned_mem_read(mr, addr, size);
 970         return true;
 971     }
 972
 973     *pval = memory_region_dispatch_read1(mr, addr, size);
 974     adjust_endianness(mr, pval, size);
 975     return false;
 976 }
 977
 978 static bool memory_region_dispatch_write(MemoryRegion *mr,
 979                                          hwaddr addr,
 980                                          uint64_t data,
 981                                          unsigned size)
 982 {
 983     if (!memory_region_access_valid(mr, addr, size, true)) {
 984         unassigned_mem_write(mr, addr, data, size);
 985         return true;
 986     }
 987
 988     adjust_endianness(mr, &data, size);
 989
 990     if (mr->ops->write) {
 991         access_with_adjusted_size(addr, &data, size,
 992                                   mr->ops->impl.min_access_size,
 993                                   mr->ops->impl.max_access_size,
 994                                   memory_region_write_accessor, mr);
 995     } else {
 996         access_with_adjusted_size(addr, &data, size, 1, 4,
 997                                   memory_region_oldmmio_write_accessor, mr);
 998     }
 999     return false;
1000 }
1001
1002 void memory_region_init_io(MemoryRegion *mr,
1003                            const MemoryRegionOps *ops,
1004                            void *opaque,
1005                            const char *name,
1006                            uint64_t size)
1007 {
1008     memory_region_init(mr, name, size);
1009     mr->ops = ops;
1010     mr->opaque = opaque;
1011     mr->terminates = true;
1012     mr->ram_addr = ~(ram_addr_t)0;
1013 }
1014
1015 void memory_region_init_ram(MemoryRegion *mr,
1016                             const char *name,
1017                             uint64_t size)
1018 {
1019     memory_region_init(mr, name, size);
1020     mr->ram = true;
1021     mr->terminates = true;
1022     mr->destructor = memory_region_destructor_ram;
1023     mr->ram_addr = qemu_ram_alloc(size, mr);
1024 }
1025
1026 void memory_region_init_ram_ptr(MemoryRegion *mr,
1027                                 const char *name,
1028                                 uint64_t size,
1029                                 void *ptr)
1030 {
1031     memory_region_init(mr, name, size);
1032     mr->ram = true;
1033     mr->terminates = true;
1034     mr->destructor = memory_region_destructor_ram_from_ptr;
1035     mr->ram_addr = qemu_ram_alloc_from_ptr(size, ptr, mr);
1036 }
1037
1038 void memory_region_init_alias(MemoryRegion *mr,
1039                               const char *name,
1040                               MemoryRegion *orig,
1041                               hwaddr offset,
1042                               uint64_t size)
1043 {
1044     memory_region_init(mr, name, size);
1045     mr->alias = orig;
1046     mr->alias_offset = offset;
1047 }
1048
1049 void memory_region_init_rom_device(MemoryRegion *mr,
1050                                    const MemoryRegionOps *ops,
1051                                    void *opaque,
1052                                    const char *name,
1053                                    uint64_t size)
1054 {
1055     memory_region_init(mr, name, size);
1056     mr->ops = ops;
1057     mr->opaque = opaque;
1058     mr->terminates = true;
1059     mr->rom_device = true;
1060     mr->destructor = memory_region_destructor_rom_device;
1061     mr->ram_addr = qemu_ram_alloc(size, mr);
1062 }
1063
1064 void memory_region_init_iommu(MemoryRegion *mr,
1065                               const MemoryRegionIOMMUOps *ops,
1066                               const char *name,
1067                               uint64_t size)
1068 {
1069     memory_region_init(mr, name, size);
1070     mr->iommu_ops = ops,
1071     mr->terminates = true;  /* then re-forwards */
1072     notifier_list_init(&mr->iommu_notify);
1073 }
1074
1075 void memory_region_init_reservation(MemoryRegion *mr,
1076                                     const char *name,
1077                                     uint64_t size)
1078 {
1079     memory_region_init_io(mr, &unassigned_mem_ops, mr, name, size);
1080 }
1081
1082 void memory_region_destroy(MemoryRegion *mr)
1083 {
1084     assert(QTAILQ_EMPTY(&mr->subregions));
1085     assert(memory_region_transaction_depth == 0);
1086     mr->destructor(mr);
1087     memory_region_clear_coalescing(mr);
1088     g_free((char *)mr->name);
1089     g_free(mr->ioeventfds);
1090 }
1091
1092 uint64_t memory_region_size(MemoryRegion *mr)
1093 {
1094     if (int128_eq(mr->size, int128_2_64())) {
1095         return UINT64_MAX;
1096     }
1097     return int128_get64(mr->size);
1098 }
1099
1100 const char *memory_region_name(MemoryRegion *mr)
1101 {
1102     return mr->name;
1103 }
1104
1105 bool memory_region_is_ram(MemoryRegion *mr)
1106 {
1107     return mr->ram;
1108 }
1109
1110 bool memory_region_is_logging(MemoryRegion *mr)
1111 {
1112     return mr->dirty_log_mask;
1113 }
1114
1115 bool memory_region_is_rom(MemoryRegion *mr)
1116 {
1117     return mr->ram && mr->readonly;
1118 }
1119
1120 bool memory_region_is_iommu(MemoryRegion *mr)
1121 {
1122     return mr->iommu_ops;
1123 }
1124
1125 void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n)
1126 {
1127     notifier_list_add(&mr->iommu_notify, n);
1128 }
1129
1130 void memory_region_unregister_iommu_notifier(Notifier *n)
1131 {
1132     notifier_remove(n);
1133 }
1134
1135 void memory_region_notify_iommu(MemoryRegion *mr,
1136                                 IOMMUTLBEntry entry)
1137 {
1138     assert(memory_region_is_iommu(mr));
1139     notifier_list_notify(&mr->iommu_notify, &entry);
1140 }
1141
1142 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
1143 {
1144     uint8_t mask = 1 << client;
1145
1146     memory_region_transaction_begin();
1147     mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
1148     memory_region_update_pending |= mr->enabled;
1149     memory_region_transaction_commit();
1150 }
1151
1152 bool memory_region_get_dirty(MemoryRegion *mr, hwaddr addr,
1153                              hwaddr size, unsigned client)
1154 {
1155     assert(mr->terminates);
1156     return cpu_physical_memory_get_dirty(mr->ram_addr + addr, size,
1157                                          1 << client);
1158 }
1159
1160 void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,
1161                              hwaddr size)
1162 {
1163     assert(mr->terminates);
1164     return cpu_physical_memory_set_dirty_range(mr->ram_addr + addr, size, -1);
1165 }
1166
1167 bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr,
1168                                         hwaddr size, unsigned client)
1169 {
1170     bool ret;
1171     assert(mr->terminates);
1172     ret = cpu_physical_memory_get_dirty(mr->ram_addr + addr, size,
1173                                         1 << client);
1174     if (ret) {
1175         cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
1176                                         mr->ram_addr + addr + size,
1177                                         1 << client);
1178     }
1179     return ret;
1180 }
1181
1182
1183 void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
1184 {
1185     AddressSpace *as;
1186     FlatRange *fr;
1187
1188     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1189         FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1190             if (fr->mr == mr) {
1191                 MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1192             }
1193         }
1194     }
1195 }
1196
1197 void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
1198 {
1199     if (mr->readonly != readonly) {
1200         memory_region_transaction_begin();
1201         mr->readonly = readonly;
1202         memory_region_update_pending |= mr->enabled;
1203         memory_region_transaction_commit();
1204     }
1205 }
1206
1207 void memory_region_rom_device_set_romd(MemoryRegion *mr, bool romd_mode)
1208 {
1209     if (mr->romd_mode != romd_mode) {
1210         memory_region_transaction_begin();
1211         mr->romd_mode = romd_mode;
1212         memory_region_update_pending |= mr->enabled;
1213         memory_region_transaction_commit();
1214     }
1215 }
1216
1217 void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
1218                                hwaddr size, unsigned client)
1219 {
1220     assert(mr->terminates);
1221     cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
1222                                     mr->ram_addr + addr + size,
1223                                     1 << client);
1224 }
1225
1226 void *memory_region_get_ram_ptr(MemoryRegion *mr)
1227 {
1228     if (mr->alias) {
1229         return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset;
1230     }
1231
1232     assert(mr->terminates);
1233
1234     return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
1235 }
1236
1237 static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as)
1238 {
1239     FlatRange *fr;
1240     CoalescedMemoryRange *cmr;
1241     AddrRange tmp;
1242     MemoryRegionSection section;
1243
1244     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1245         if (fr->mr == mr) {
1246             section = (MemoryRegionSection) {
1247                 .address_space = as,
1248                 .offset_within_address_space = int128_get64(fr->addr.start),
1249                 .size = fr->addr.size,
1250             };
1251
1252             MEMORY_LISTENER_CALL(coalesced_mmio_del, Reverse, &section,
1253                                  int128_get64(fr->addr.start),
1254                                  int128_get64(fr->addr.size));
1255             QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
1256                 tmp = addrrange_shift(cmr->addr,
1257                                       int128_sub(fr->addr.start,
1258                                                  int128_make64(fr->offset_in_region)));
1259                 if (!addrrange_intersects(tmp, fr->addr)) {
1260                     continue;
1261                 }
1262                 tmp = addrrange_intersection(tmp, fr->addr);
1263                 MEMORY_LISTENER_CALL(coalesced_mmio_add, Forward, &section,
1264                                      int128_get64(tmp.start),
1265                                      int128_get64(tmp.size));
1266             }
1267         }
1268     }
1269 }
1270
1271 static void memory_region_update_coalesced_range(MemoryRegion *mr)
1272 {
1273     AddressSpace *as;
1274
1275     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1276         memory_region_update_coalesced_range_as(mr, as);
1277     }
1278 }
1279
1280 void memory_region_set_coalescing(MemoryRegion *mr)
1281 {
1282     memory_region_clear_coalescing(mr);
1283     memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
1284 }
1285
1286 void memory_region_add_coalescing(MemoryRegion *mr,
1287                                   hwaddr offset,
1288                                   uint64_t size)
1289 {
1290     CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
1291
1292     cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
1293     QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
1294     memory_region_update_coalesced_range(mr);
1295     memory_region_set_flush_coalesced(mr);
1296 }
1297
1298 void memory_region_clear_coalescing(MemoryRegion *mr)
1299 {
1300     CoalescedMemoryRange *cmr;
1301
1302     qemu_flush_coalesced_mmio_buffer();
1303     mr->flush_coalesced_mmio = false;
1304
1305     while (!QTAILQ_EMPTY(&mr->coalesced)) {
1306         cmr = QTAILQ_FIRST(&mr->coalesced);
1307         QTAILQ_REMOVE(&mr->coalesced, cmr, link);
1308         g_free(cmr);
1309     }
1310     memory_region_update_coalesced_range(mr);
1311 }
1312
1313 void memory_region_set_flush_coalesced(MemoryRegion *mr)
1314 {
1315     mr->flush_coalesced_mmio = true;
1316 }
1317
1318 void memory_region_clear_flush_coalesced(MemoryRegion *mr)
1319 {
1320     qemu_flush_coalesced_mmio_buffer();
1321     if (QTAILQ_EMPTY(&mr->coalesced)) {
1322         mr->flush_coalesced_mmio = false;
1323     }
1324 }
1325
1326 void memory_region_add_eventfd(MemoryRegion *mr,
1327                                hwaddr addr,
1328                                unsigned size,
1329                                bool match_data,
1330                                uint64_t data,
1331                                EventNotifier *e)
1332 {
1333     MemoryRegionIoeventfd mrfd = {
1334         .addr.start = int128_make64(addr),
1335         .addr.size = int128_make64(size),
1336         .match_data = match_data,
1337         .data = data,
1338         .e = e,
1339     };
1340     unsigned i;
1341
1342     adjust_endianness(mr, &mrfd.data, size);
1343     memory_region_transaction_begin();
1344     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1345         if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
1346             break;
1347         }
1348     }
1349     ++mr->ioeventfd_nb;
1350     mr->ioeventfds = g_realloc(mr->ioeventfds,
1351                                   sizeof(*mr->ioeventfds) * mr->ioeventfd_nb);
1352     memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i],
1353             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i));
1354     mr->ioeventfds[i] = mrfd;
1355     memory_region_update_pending |= mr->enabled;
1356     memory_region_transaction_commit();
1357 }
1358
1359 void memory_region_del_eventfd(MemoryRegion *mr,
1360                                hwaddr addr,
1361                                unsigned size,
1362                                bool match_data,
1363                                uint64_t data,
1364                                EventNotifier *e)
1365 {
1366     MemoryRegionIoeventfd mrfd = {
1367         .addr.start = int128_make64(addr),
1368         .addr.size = int128_make64(size),
1369         .match_data = match_data,
1370         .data = data,
1371         .e = e,
1372     };
1373     unsigned i;
1374
1375     adjust_endianness(mr, &mrfd.data, size);
1376     memory_region_transaction_begin();
1377     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1378         if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {
1379             break;
1380         }
1381     }
1382     assert(i != mr->ioeventfd_nb);
1383     memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1],
1384             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1)));
1385     --mr->ioeventfd_nb;
1386     mr->ioeventfds = g_realloc(mr->ioeventfds,
1387                                   sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1);
1388     memory_region_update_pending |= mr->enabled;
1389     memory_region_transaction_commit();
1390 }
1391
1392 static void memory_region_add_subregion_common(MemoryRegion *mr,
1393                                                hwaddr offset,
1394                                                MemoryRegion *subregion)
1395 {
1396     MemoryRegion *other;
1397
1398     memory_region_transaction_begin();
1399
1400     assert(!subregion->parent);
1401     subregion->parent = mr;
1402     subregion->addr = offset;
1403     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1404         if (subregion->may_overlap || other->may_overlap) {
1405             continue;
1406         }
1407         if (int128_ge(int128_make64(offset),
1408                       int128_add(int128_make64(other->addr), other->size))
1409             || int128_le(int128_add(int128_make64(offset), subregion->size),
1410                          int128_make64(other->addr))) {
1411             continue;
1412         }
1413 #if 0
1414         printf("warning: subregion collision %llx/%llx (%s) "
1415                "vs %llx/%llx (%s)\n",
1416                (unsigned long long)offset,
1417                (unsigned long long)int128_get64(subregion->size),
1418                subregion->name,
1419                (unsigned long long)other->addr,
1420                (unsigned long long)int128_get64(other->size),
1421                other->name);
1422 #endif
1423     }
1424     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1425         if (subregion->priority >= other->priority) {
1426             QTAILQ_INSERT_BEFORE(other, subregion, subregions_link);
1427             goto done;
1428         }
1429     }
1430     QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link);
1431 done:
1432     memory_region_update_pending |= mr->enabled && subregion->enabled;
1433     memory_region_transaction_commit();
1434 }
1435
1436
1437 void memory_region_add_subregion(MemoryRegion *mr,
1438                                  hwaddr offset,
1439                                  MemoryRegion *subregion)
1440 {
1441     subregion->may_overlap = false;
1442     subregion->priority = 0;
1443     memory_region_add_subregion_common(mr, offset, subregion);
1444 }
1445
1446 void memory_region_add_subregion_overlap(MemoryRegion *mr,
1447                                          hwaddr offset,
1448                                          MemoryRegion *subregion,
1449                                          unsigned priority)
1450 {
1451     subregion->may_overlap = true;
1452     subregion->priority = priority;
1453     memory_region_add_subregion_common(mr, offset, subregion);
1454 }
1455
1456 void memory_region_del_subregion(MemoryRegion *mr,
1457                                  MemoryRegion *subregion)
1458 {
1459     memory_region_transaction_begin();
1460     assert(subregion->parent == mr);
1461     subregion->parent = NULL;
1462     QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
1463     memory_region_update_pending |= mr->enabled && subregion->enabled;
1464     memory_region_transaction_commit();
1465 }
1466
1467 void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
1468 {
1469     if (enabled == mr->enabled) {
1470         return;
1471     }
1472     memory_region_transaction_begin();
1473     mr->enabled = enabled;
1474     memory_region_update_pending = true;
1475     memory_region_transaction_commit();
1476 }
1477
1478 void memory_region_set_address(MemoryRegion *mr, hwaddr addr)
1479 {
1480     MemoryRegion *parent = mr->parent;
1481     unsigned priority = mr->priority;
1482     bool may_overlap = mr->may_overlap;
1483
1484     if (addr == mr->addr || !parent) {
1485         mr->addr = addr;
1486         return;
1487     }
1488
1489     memory_region_transaction_begin();
1490     memory_region_del_subregion(parent, mr);
1491     if (may_overlap) {
1492         memory_region_add_subregion_overlap(parent, addr, mr, priority);
1493     } else {
1494         memory_region_add_subregion(parent, addr, mr);
1495     }
1496     memory_region_transaction_commit();
1497 }
1498
1499 void memory_region_set_alias_offset(MemoryRegion *mr, hwaddr offset)
1500 {
1501     assert(mr->alias);
1502
1503     if (offset == mr->alias_offset) {
1504         return;
1505     }
1506
1507     memory_region_transaction_begin();
1508     mr->alias_offset = offset;
1509     memory_region_update_pending |= mr->enabled;
1510     memory_region_transaction_commit();
1511 }
1512
1513 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
1514 {
1515     return mr->ram_addr;
1516 }
1517
1518 static int cmp_flatrange_addr(const void *addr_, const void *fr_)
1519 {
1520     const AddrRange *addr = addr_;
1521     const FlatRange *fr = fr_;
1522
1523     if (int128_le(addrrange_end(*addr), fr->addr.start)) {
1524         return -1;
1525     } else if (int128_ge(addr->start, addrrange_end(fr->addr))) {
1526         return 1;
1527     }
1528     return 0;
1529 }
1530
1531 static FlatRange *address_space_lookup(AddressSpace *as, AddrRange addr)
1532 {
1533     return bsearch(&addr, as->current_map->ranges, as->current_map->nr,
1534                    sizeof(FlatRange), cmp_flatrange_addr);
1535 }
1536
1537 MemoryRegionSection memory_region_find(MemoryRegion *mr,
1538                                        hwaddr addr, uint64_t size)
1539 {
1540     MemoryRegionSection ret = { .mr = NULL };
1541     MemoryRegion *root;
1542     AddressSpace *as;
1543     AddrRange range;
1544     FlatRange *fr;
1545
1546     addr += mr->addr;
1547     for (root = mr; root->parent; ) {
1548         root = root->parent;
1549         addr += root->addr;
1550     }
1551
1552     as = memory_region_to_address_space(root);
1553     range = addrrange_make(int128_make64(addr), int128_make64(size));
1554     fr = address_space_lookup(as, range);
1555     if (!fr) {
1556         return ret;
1557     }
1558
1559     while (fr > as->current_map->ranges
1560            && addrrange_intersects(fr[-1].addr, range)) {
1561         --fr;
1562     }
1563
1564     ret.mr = fr->mr;
1565     ret.address_space = as;
1566     range = addrrange_intersection(range, fr->addr);
1567     ret.offset_within_region = fr->offset_in_region;
1568     ret.offset_within_region += int128_get64(int128_sub(range.start,
1569                                                         fr->addr.start));
1570     ret.size = range.size;
1571     ret.offset_within_address_space = int128_get64(range.start);
1572     ret.readonly = fr->readonly;
1573     return ret;
1574 }
1575
1576 void address_space_sync_dirty_bitmap(AddressSpace *as)
1577 {
1578     FlatRange *fr;
1579
1580     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1581         MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1582     }
1583 }
1584
1585 void memory_global_dirty_log_start(void)
1586 {
1587     global_dirty_log = true;
1588     MEMORY_LISTENER_CALL_GLOBAL(log_global_start, Forward);
1589 }
1590
1591 void memory_global_dirty_log_stop(void)
1592 {
1593     global_dirty_log = false;
1594     MEMORY_LISTENER_CALL_GLOBAL(log_global_stop, Reverse);
1595 }
1596
1597 static void listener_add_address_space(MemoryListener *listener,
1598                                        AddressSpace *as)
1599 {
1600     FlatRange *fr;
1601
1602     if (listener->address_space_filter
1603         && listener->address_space_filter != as) {
1604         return;
1605     }
1606
1607     if (global_dirty_log) {
1608         if (listener->log_global_start) {
1609             listener->log_global_start(listener);
1610         }
1611     }
1612
1613     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1614         MemoryRegionSection section = {
1615             .mr = fr->mr,
1616             .address_space = as,
1617             .offset_within_region = fr->offset_in_region,
1618             .size = fr->addr.size,
1619             .offset_within_address_space = int128_get64(fr->addr.start),
1620             .readonly = fr->readonly,
1621         };
1622         if (listener->region_add) {
1623             listener->region_add(listener, &section);
1624         }
1625     }
1626 }
1627
1628 void memory_listener_register(MemoryListener *listener, AddressSpace *filter)
1629 {
1630     MemoryListener *other = NULL;
1631     AddressSpace *as;
1632
1633     listener->address_space_filter = filter;
1634     if (QTAILQ_EMPTY(&memory_listeners)
1635         || listener->priority >= QTAILQ_LAST(&memory_listeners,
1636                                              memory_listeners)->priority) {
1637         QTAILQ_INSERT_TAIL(&memory_listeners, listener, link);
1638     } else {
1639         QTAILQ_FOREACH(other, &memory_listeners, link) {
1640             if (listener->priority < other->priority) {
1641                 break;
1642             }
1643         }
1644         QTAILQ_INSERT_BEFORE(other, listener, link);
1645     }
1646
1647     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1648         listener_add_address_space(listener, as);
1649     }
1650 }
1651
1652 void memory_listener_unregister(MemoryListener *listener)
1653 {
1654     QTAILQ_REMOVE(&memory_listeners, listener, link);
1655 }
1656
1657 void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name)
1658 {
1659     memory_region_transaction_begin();
1660     as->root = root;
1661     as->current_map = g_new(FlatView, 1);
1662     flatview_init(as->current_map);
1663     as->ioeventfd_nb = 0;
1664     as->ioeventfds = NULL;
1665     QTAILQ_INSERT_TAIL(&address_spaces, as, address_spaces_link);
1666     as->name = g_strdup(name ? name : "anonymous");
1667     address_space_init_dispatch(as);
1668     memory_region_update_pending |= root->enabled;
1669     memory_region_transaction_commit();
1670 }
1671
1672 void address_space_destroy(AddressSpace *as)
1673 {
1674     /* Flush out anything from MemoryListeners listening in on this */
1675     memory_region_transaction_begin();
1676     as->root = NULL;
1677     memory_region_transaction_commit();
1678     QTAILQ_REMOVE(&address_spaces, as, address_spaces_link);
1679     address_space_destroy_dispatch(as);
1680     flatview_destroy(as->current_map);
1681     g_free(as->name);
1682     g_free(as->current_map);
1683     g_free(as->ioeventfds);
1684 }
1685
1686 bool io_mem_read(MemoryRegion *mr, hwaddr addr, uint64_t *pval, unsigned size)
1687 {
1688     return memory_region_dispatch_read(mr, addr, pval, size);
1689 }
1690
1691 bool io_mem_write(MemoryRegion *mr, hwaddr addr,
1692                   uint64_t val, unsigned size)
1693 {
1694     return memory_region_dispatch_write(mr, addr, val, size);
1695 }
1696
1697 typedef struct MemoryRegionList MemoryRegionList;
1698
1699 struct MemoryRegionList {
1700     const MemoryRegion *mr;
1701     bool printed;
1702     QTAILQ_ENTRY(MemoryRegionList) queue;
1703 };
1704
1705 typedef QTAILQ_HEAD(queue, MemoryRegionList) MemoryRegionListHead;
1706
1707 static void mtree_print_mr(fprintf_function mon_printf, void *f,
1708                            const MemoryRegion *mr, unsigned int level,
1709                            hwaddr base,
1710                            MemoryRegionListHead *alias_print_queue)
1711 {
1712     MemoryRegionList *new_ml, *ml, *next_ml;
1713     MemoryRegionListHead submr_print_queue;
1714     const MemoryRegion *submr;
1715     unsigned int i;
1716
1717     if (!mr || !mr->enabled) {
1718         return;
1719     }
1720
1721     for (i = 0; i < level; i++) {
1722         mon_printf(f, "  ");
1723     }
1724
1725     if (mr->alias) {
1726         MemoryRegionList *ml;
1727         bool found = false;
1728
1729         /* check if the alias is already in the queue */
1730         QTAILQ_FOREACH(ml, alias_print_queue, queue) {
1731             if (ml->mr == mr->alias && !ml->printed) {
1732                 found = true;
1733             }
1734         }
1735
1736         if (!found) {
1737             ml = g_new(MemoryRegionList, 1);
1738             ml->mr = mr->alias;
1739             ml->printed = false;
1740             QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue);
1741         }
1742         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx
1743                    " (prio %d, %c%c): alias %s @%s " TARGET_FMT_plx
1744                    "-" TARGET_FMT_plx "\n",
1745                    base + mr->addr,
1746                    base + mr->addr
1747                    + (hwaddr)int128_get64(int128_sub(mr->size, int128_make64(1))),
1748                    mr->priority,
1749                    mr->romd_mode ? 'R' : '-',
1750                    !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
1751                                                                        : '-',
1752                    mr->name,
1753                    mr->alias->name,
1754                    mr->alias_offset,
1755                    mr->alias_offset
1756                    + (hwaddr)int128_get64(mr->size) - 1);
1757     } else {
1758         mon_printf(f,
1759                    TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d, %c%c): %s\n",
1760                    base + mr->addr,
1761                    base + mr->addr
1762                    + (hwaddr)int128_get64(int128_sub(mr->size, int128_make64(1))),
1763                    mr->priority,
1764                    mr->romd_mode ? 'R' : '-',
1765                    !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
1766                                                                        : '-',
1767                    mr->name);
1768     }
1769
1770     QTAILQ_INIT(&submr_print_queue);
1771
1772     QTAILQ_FOREACH(submr, &mr->subregions, subregions_link) {
1773         new_ml = g_new(MemoryRegionList, 1);
1774         new_ml->mr = submr;
1775         QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1776             if (new_ml->mr->addr < ml->mr->addr ||
1777                 (new_ml->mr->addr == ml->mr->addr &&
1778                  new_ml->mr->priority > ml->mr->priority)) {
1779                 QTAILQ_INSERT_BEFORE(ml, new_ml, queue);
1780                 new_ml = NULL;
1781                 break;
1782             }
1783         }
1784         if (new_ml) {
1785             QTAILQ_INSERT_TAIL(&submr_print_queue, new_ml, queue);
1786         }
1787     }
1788
1789     QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1790         mtree_print_mr(mon_printf, f, ml->mr, level + 1, base + mr->addr,
1791                        alias_print_queue);
1792     }
1793
1794     QTAILQ_FOREACH_SAFE(ml, &submr_print_queue, queue, next_ml) {
1795         g_free(ml);
1796     }
1797 }
1798
1799 void mtree_info(fprintf_function mon_printf, void *f)
1800 {
1801     MemoryRegionListHead ml_head;
1802     MemoryRegionList *ml, *ml2;
1803     AddressSpace *as;
1804
1805     QTAILQ_INIT(&ml_head);
1806
1807     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1808         mon_printf(f, "%s\n", as->name);
1809         mtree_print_mr(mon_printf, f, as->root, 0, 0, &ml_head);
1810     }
1811
1812     mon_printf(f, "aliases\n");
1813     /* print aliased regions */
1814     QTAILQ_FOREACH(ml, &ml_head, queue) {
1815         if (!ml->printed) {
1816             mon_printf(f, "%s\n", ml->mr->name);
1817             mtree_print_mr(mon_printf, f, ml->mr, 0, 0, &ml_head);
1818         }
1819     }
1820
1821     QTAILQ_FOREACH_SAFE(ml, &ml_head, queue, ml2) {
1822         g_free(ml);
1823     }
1824 }