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