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 static unsigned memory_region_transaction_depth;
  26 static bool memory_region_update_pending;
  27 static bool global_dirty_log = false;
  28
  29 static QTAILQ_HEAD(memory_listeners, MemoryListener) memory_listeners
  30     = QTAILQ_HEAD_INITIALIZER(memory_listeners);
  31
  32 static QTAILQ_HEAD(, AddressSpace) address_spaces
  33     = QTAILQ_HEAD_INITIALIZER(address_spaces);
  34
  35 typedef struct AddrRange AddrRange;
  36
  37 /*
  38  * Note using signed integers limits us to physical addresses at most
  39  * 63 bits wide.  They are needed for negative offsetting in aliases
  40  * (large MemoryRegion::alias_offset).
  41  */
  42 struct AddrRange {
  43     Int128 start;
  44     Int128 size;
  45 };
  46
  47 static AddrRange addrrange_make(Int128 start, Int128 size)
  48 {
  49     return (AddrRange) { start, size };
  50 }
  51
  52 static bool addrrange_equal(AddrRange r1, AddrRange r2)
  53 {
  54     return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
  55 }
  56
  57 static Int128 addrrange_end(AddrRange r)
  58 {
  59     return int128_add(r.start, r.size);
  60 }
  61
  62 static AddrRange addrrange_shift(AddrRange range, Int128 delta)
  63 {
  64     int128_addto(&range.start, delta);
  65     return range;
  66 }
  67
  68 static bool addrrange_contains(AddrRange range, Int128 addr)
  69 {
  70     return int128_ge(addr, range.start)
  71         && int128_lt(addr, addrrange_end(range));
  72 }
  73
  74 static bool addrrange_intersects(AddrRange r1, AddrRange r2)
  75 {
  76     return addrrange_contains(r1, r2.start)
  77         || addrrange_contains(r2, r1.start);
  78 }
  79
  80 static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
  81 {
  82     Int128 start = int128_max(r1.start, r2.start);
  83     Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
  84     return addrrange_make(start, int128_sub(end, start));
  85 }
  86
  87 enum ListenerDirection { Forward, Reverse };
  88
  89 static bool memory_listener_match(MemoryListener *listener,
  90                                   MemoryRegionSection *section)
  91 {
  92     return !listener->address_space_filter
  93         || listener->address_space_filter == section->address_space;
  94 }
  95
  96 #define MEMORY_LISTENER_CALL_GLOBAL(_callback, _direction, _args...)    \
  97     do {                                                                \
  98         MemoryListener *_listener;                                      \
  99                                                                         \
 100         switch (_direction) {                                           \
 101         case Forward:                                                   \
 102             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 103                 if (_listener->_callback) {                             \
 104                     _listener->_callback(_listener, ##_args);           \
 105                 }                                                       \
 106             }                                                           \
 107             break;                                                      \
 108         case Reverse:                                                   \
 109             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 110                                    memory_listeners, link) {            \
 111                 if (_listener->_callback) {                             \
 112                     _listener->_callback(_listener, ##_args);           \
 113                 }                                                       \
 114             }                                                           \
 115             break;                                                      \
 116         default:                                                        \
 117             abort();                                                    \
 118         }                                                               \
 119     } while (0)
 120
 121 #define MEMORY_LISTENER_CALL(_callback, _direction, _section, _args...) \
 122     do {                                                                \
 123         MemoryListener *_listener;                                      \
 124                                                                         \
 125         switch (_direction) {                                           \
 126         case Forward:                                                   \
 127             QTAILQ_FOREACH(_listener, &memory_listeners, link) {        \
 128                 if (_listener->_callback                                \
 129                     && memory_listener_match(_listener, _section)) {    \
 130                     _listener->_callback(_listener, _section, ##_args); \
 131                 }                                                       \
 132             }                                                           \
 133             break;                                                      \
 134         case Reverse:                                                   \
 135             QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners,        \
 136                                    memory_listeners, link) {            \
 137                 if (_listener->_callback                                \
 138                     && memory_listener_match(_listener, _section)) {    \
 139                     _listener->_callback(_listener, _section, ##_args); \
 140                 }                                                       \
 141             }                                                           \
 142             break;                                                      \
 143         default:                                                        \
 144             abort();                                                    \
 145         }                                                               \
 146     } while (0)
 147
 148 #define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback)            \
 149     MEMORY_LISTENER_CALL(callback, dir, (&(MemoryRegionSection) {       \
 150         .mr = (fr)->mr,                                                 \
 151         .address_space = (as),                                          \
 152         .offset_within_region = (fr)->offset_in_region,                 \
 153         .size = int128_get64((fr)->addr.size),                          \
 154         .offset_within_address_space = int128_get64((fr)->addr.start),  \
 155         .readonly = (fr)->readonly,                                     \
 156               }))
 157
 158 struct CoalescedMemoryRange {
 159     AddrRange addr;
 160     QTAILQ_ENTRY(CoalescedMemoryRange) link;
 161 };
 162
 163 struct MemoryRegionIoeventfd {
 164     AddrRange addr;
 165     bool match_data;
 166     uint64_t data;
 167     EventNotifier *e;
 168 };
 169
 170 static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
 171                                            MemoryRegionIoeventfd b)
 172 {
 173     if (int128_lt(a.addr.start, b.addr.start)) {
 174         return true;
 175     } else if (int128_gt(a.addr.start, b.addr.start)) {
 176         return false;
 177     } else if (int128_lt(a.addr.size, b.addr.size)) {
 178         return true;
 179     } else if (int128_gt(a.addr.size, b.addr.size)) {
 180         return false;
 181     } else if (a.match_data < b.match_data) {
 182         return true;
 183     } else  if (a.match_data > b.match_data) {
 184         return false;
 185     } else if (a.match_data) {
 186         if (a.data < b.data) {
 187             return true;
 188         } else if (a.data > b.data) {
 189             return false;
 190         }
 191     }
 192     if (a.e < b.e) {
 193         return true;
 194     } else if (a.e > b.e) {
 195         return false;
 196     }
 197     return false;
 198 }
 199
 200 static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
 201                                           MemoryRegionIoeventfd b)
 202 {
 203     return !memory_region_ioeventfd_before(a, b)
 204         && !memory_region_ioeventfd_before(b, a);
 205 }
 206
 207 typedef struct FlatRange FlatRange;
 208 typedef struct FlatView FlatView;
 209
 210 /* Range of memory in the global map.  Addresses are absolute. */
 211 struct FlatRange {
 212     MemoryRegion *mr;
 213     hwaddr offset_in_region;
 214     AddrRange addr;
 215     uint8_t dirty_log_mask;
 216     bool romd_mode;
 217     bool readonly;
 218 };
 219
 220 /* Flattened global view of current active memory hierarchy.  Kept in sorted
 221  * order.
 222  */
 223 struct FlatView {
 224     FlatRange *ranges;
 225     unsigned nr;
 226     unsigned nr_allocated;
 227 };
 228
 229 typedef struct AddressSpaceOps AddressSpaceOps;
 230
 231 #define FOR_EACH_FLAT_RANGE(var, view)          \
 232     for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
 233
 234 static bool flatrange_equal(FlatRange *a, FlatRange *b)
 235 {
 236     return a->mr == b->mr
 237         && addrrange_equal(a->addr, b->addr)
 238         && a->offset_in_region == b->offset_in_region
 239         && a->romd_mode == b->romd_mode
 240         && a->readonly == b->readonly;
 241 }
 242
 243 static void flatview_init(FlatView *view)
 244 {
 245     view->ranges = NULL;
 246     view->nr = 0;
 247     view->nr_allocated = 0;
 248 }
 249
 250 /* Insert a range into a given position.  Caller is responsible for maintaining
 251  * sorting order.
 252  */
 253 static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range)
 254 {
 255     if (view->nr == view->nr_allocated) {
 256         view->nr_allocated = MAX(2 * view->nr, 10);
 257         view->ranges = g_realloc(view->ranges,
 258                                     view->nr_allocated * sizeof(*view->ranges));
 259     }
 260     memmove(view->ranges + pos + 1, view->ranges + pos,
 261             (view->nr - pos) * sizeof(FlatRange));
 262     view->ranges[pos] = *range;
 263     ++view->nr;
 264 }
 265
 266 static void flatview_destroy(FlatView *view)
 267 {
 268     g_free(view->ranges);
 269 }
 270
 271 static bool can_merge(FlatRange *r1, FlatRange *r2)
 272 {
 273     return int128_eq(addrrange_end(r1->addr), r2->addr.start)
 274         && r1->mr == r2->mr
 275         && int128_eq(int128_add(int128_make64(r1->offset_in_region),
 276                                 r1->addr.size),
 277                      int128_make64(r2->offset_in_region))
 278         && r1->dirty_log_mask == r2->dirty_log_mask
 279         && r1->romd_mode == r2->romd_mode
 280         && r1->readonly == r2->readonly;
 281 }
 282
 283 /* Attempt to simplify a view by merging ajacent ranges */
 284 static void flatview_simplify(FlatView *view)
 285 {
 286     unsigned i, j;
 287
 288     i = 0;
 289     while (i < view->nr) {
 290         j = i + 1;
 291         while (j < view->nr
 292                && can_merge(&view->ranges[j-1], &view->ranges[j])) {
 293             int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
 294             ++j;
 295         }
 296         ++i;
 297         memmove(&view->ranges[i], &view->ranges[j],
 298                 (view->nr - j) * sizeof(view->ranges[j]));
 299         view->nr -= j - i;
 300     }
 301 }
 302
 303 static void memory_region_read_accessor(void *opaque,
 304                                         hwaddr addr,
 305                                         uint64_t *value,
 306                                         unsigned size,
 307                                         unsigned shift,
 308                                         uint64_t mask)
 309 {
 310     MemoryRegion *mr = opaque;
 311     uint64_t tmp;
 312
 313     if (mr->flush_coalesced_mmio) {
 314         qemu_flush_coalesced_mmio_buffer();
 315     }
 316     tmp = mr->ops->read(mr->opaque, addr, size);
 317     *value |= (tmp & mask) << shift;
 318 }
 319
 320 static void memory_region_write_accessor(void *opaque,
 321                                          hwaddr addr,
 322                                          uint64_t *value,
 323                                          unsigned size,
 324                                          unsigned shift,
 325                                          uint64_t mask)
 326 {
 327     MemoryRegion *mr = opaque;
 328     uint64_t tmp;
 329
 330     if (mr->flush_coalesced_mmio) {
 331         qemu_flush_coalesced_mmio_buffer();
 332     }
 333     tmp = (*value >> shift) & mask;
 334     mr->ops->write(mr->opaque, addr, tmp, size);
 335 }
 336
 337 static void access_with_adjusted_size(hwaddr addr,
 338                                       uint64_t *value,
 339                                       unsigned size,
 340                                       unsigned access_size_min,
 341                                       unsigned access_size_max,
 342                                       void (*access)(void *opaque,
 343                                                      hwaddr addr,
 344                                                      uint64_t *value,
 345                                                      unsigned size,
 346                                                      unsigned shift,
 347                                                      uint64_t mask),
 348                                       void *opaque)
 349 {
 350     uint64_t access_mask;
 351     unsigned access_size;
 352     unsigned i;
 353
 354     if (!access_size_min) {
 355         access_size_min = 1;
 356     }
 357     if (!access_size_max) {
 358         access_size_max = 4;
 359     }
 360     access_size = MAX(MIN(size, access_size_max), access_size_min);
 361     access_mask = -1ULL >> (64 - access_size * 8);
 362     for (i = 0; i < size; i += access_size) {
 363         /* FIXME: big-endian support */
 364         access(opaque, addr + i, value, access_size, i * 8, access_mask);
 365     }
 366 }
 367
 368 static const MemoryRegionPortio *find_portio(MemoryRegion *mr, uint64_t offset,
 369                                              unsigned width, bool write)
 370 {
 371     const MemoryRegionPortio *mrp;
 372
 373     for (mrp = mr->ops->old_portio; mrp->size; ++mrp) {
 374         if (offset >= mrp->offset && offset < mrp->offset + mrp->len
 375             && width == mrp->size
 376             && (write ? (bool)mrp->write : (bool)mrp->read)) {
 377             return mrp;
 378         }
 379     }
 380     return NULL;
 381 }
 382
 383 static void memory_region_iorange_read(IORange *iorange,
 384                                        uint64_t offset,
 385                                        unsigned width,
 386                                        uint64_t *data)
 387 {
 388     MemoryRegionIORange *mrio
 389         = container_of(iorange, MemoryRegionIORange, iorange);
 390     MemoryRegion *mr = mrio->mr;
 391
 392     offset += mrio->offset;
 393     if (mr->ops->old_portio) {
 394         const MemoryRegionPortio *mrp = find_portio(mr, offset - mrio->offset,
 395                                                     width, false);
 396
 397         *data = ((uint64_t)1 << (width * 8)) - 1;
 398         if (mrp) {
 399             *data = mrp->read(mr->opaque, offset);
 400         } else if (width == 2) {
 401             mrp = find_portio(mr, offset - mrio->offset, 1, false);
 402             assert(mrp);
 403             *data = mrp->read(mr->opaque, offset) |
 404                     (mrp->read(mr->opaque, offset + 1) << 8);
 405         }
 406         return;
 407     }
 408     *data = 0;
 409     access_with_adjusted_size(offset, data, width,
 410                               mr->ops->impl.min_access_size,
 411                               mr->ops->impl.max_access_size,
 412                               memory_region_read_accessor, mr);
 413 }
 414
 415 static void memory_region_iorange_write(IORange *iorange,
 416                                         uint64_t offset,
 417                                         unsigned width,
 418                                         uint64_t data)
 419 {
 420     MemoryRegionIORange *mrio
 421         = container_of(iorange, MemoryRegionIORange, iorange);
 422     MemoryRegion *mr = mrio->mr;
 423
 424     offset += mrio->offset;
 425     if (mr->ops->old_portio) {
 426         const MemoryRegionPortio *mrp = find_portio(mr, offset - mrio->offset,
 427                                                     width, true);
 428
 429         if (mrp) {
 430             mrp->write(mr->opaque, offset, data);
 431         } else if (width == 2) {
 432             mrp = find_portio(mr, offset - mrio->offset, 1, true);
 433             assert(mrp);
 434             mrp->write(mr->opaque, offset, data & 0xff);
 435             mrp->write(mr->opaque, offset + 1, data >> 8);
 436         }
 437         return;
 438     }
 439     access_with_adjusted_size(offset, &data, width,
 440                               mr->ops->impl.min_access_size,
 441                               mr->ops->impl.max_access_size,
 442                               memory_region_write_accessor, mr);
 443 }
 444
 445 static void memory_region_iorange_destructor(IORange *iorange)
 446 {
 447     g_free(container_of(iorange, MemoryRegionIORange, iorange));
 448 }
 449
 450 const IORangeOps memory_region_iorange_ops = {
 451     .read = memory_region_iorange_read,
 452     .write = memory_region_iorange_write,
 453     .destructor = memory_region_iorange_destructor,
 454 };
 455
 456 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
 457 {
 458     AddressSpace *as;
 459
 460     while (mr->parent) {
 461         mr = mr->parent;
 462     }
 463     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 464         if (mr == as->root) {
 465             return as;
 466         }
 467     }
 468     abort();
 469 }
 470
 471 /* Render a memory region into the global view.  Ranges in @view obscure
 472  * ranges in @mr.
 473  */
 474 static void render_memory_region(FlatView *view,
 475                                  MemoryRegion *mr,
 476                                  Int128 base,
 477                                  AddrRange clip,
 478                                  bool readonly)
 479 {
 480     MemoryRegion *subregion;
 481     unsigned i;
 482     hwaddr offset_in_region;
 483     Int128 remain;
 484     Int128 now;
 485     FlatRange fr;
 486     AddrRange tmp;
 487
 488     if (!mr->enabled) {
 489         return;
 490     }
 491
 492     int128_addto(&base, int128_make64(mr->addr));
 493     readonly |= mr->readonly;
 494
 495     tmp = addrrange_make(base, mr->size);
 496
 497     if (!addrrange_intersects(tmp, clip)) {
 498         return;
 499     }
 500
 501     clip = addrrange_intersection(tmp, clip);
 502
 503     if (mr->alias) {
 504         int128_subfrom(&base, int128_make64(mr->alias->addr));
 505         int128_subfrom(&base, int128_make64(mr->alias_offset));
 506         render_memory_region(view, mr->alias, base, clip, readonly);
 507         return;
 508     }
 509
 510     /* Render subregions in priority order. */
 511     QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) {
 512         render_memory_region(view, subregion, base, clip, readonly);
 513     }
 514
 515     if (!mr->terminates) {
 516         return;
 517     }
 518
 519     offset_in_region = int128_get64(int128_sub(clip.start, base));
 520     base = clip.start;
 521     remain = clip.size;
 522
 523     /* Render the region itself into any gaps left by the current view. */
 524     for (i = 0; i < view->nr && int128_nz(remain); ++i) {
 525         if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
 526             continue;
 527         }
 528         if (int128_lt(base, view->ranges[i].addr.start)) {
 529             now = int128_min(remain,
 530                              int128_sub(view->ranges[i].addr.start, base));
 531             fr.mr = mr;
 532             fr.offset_in_region = offset_in_region;
 533             fr.addr = addrrange_make(base, now);
 534             fr.dirty_log_mask = mr->dirty_log_mask;
 535             fr.romd_mode = mr->romd_mode;
 536             fr.readonly = readonly;
 537             flatview_insert(view, i, &fr);
 538             ++i;
 539             int128_addto(&base, now);
 540             offset_in_region += int128_get64(now);
 541             int128_subfrom(&remain, now);
 542         }
 543         now = int128_sub(int128_min(int128_add(base, remain),
 544                                     addrrange_end(view->ranges[i].addr)),
 545                          base);
 546         int128_addto(&base, now);
 547         offset_in_region += int128_get64(now);
 548         int128_subfrom(&remain, now);
 549     }
 550     if (int128_nz(remain)) {
 551         fr.mr = mr;
 552         fr.offset_in_region = offset_in_region;
 553         fr.addr = addrrange_make(base, remain);
 554         fr.dirty_log_mask = mr->dirty_log_mask;
 555         fr.romd_mode = mr->romd_mode;
 556         fr.readonly = readonly;
 557         flatview_insert(view, i, &fr);
 558     }
 559 }
 560
 561 /* Render a memory topology into a list of disjoint absolute ranges. */
 562 static FlatView generate_memory_topology(MemoryRegion *mr)
 563 {
 564     FlatView view;
 565
 566     flatview_init(&view);
 567
 568     if (mr) {
 569         render_memory_region(&view, mr, int128_zero(),
 570                              addrrange_make(int128_zero(), int128_2_64()), false);
 571     }
 572     flatview_simplify(&view);
 573
 574     return view;
 575 }
 576
 577 static void address_space_add_del_ioeventfds(AddressSpace *as,
 578                                              MemoryRegionIoeventfd *fds_new,
 579                                              unsigned fds_new_nb,
 580                                              MemoryRegionIoeventfd *fds_old,
 581                                              unsigned fds_old_nb)
 582 {
 583     unsigned iold, inew;
 584     MemoryRegionIoeventfd *fd;
 585     MemoryRegionSection section;
 586
 587     /* Generate a symmetric difference of the old and new fd sets, adding
 588      * and deleting as necessary.
 589      */
 590
 591     iold = inew = 0;
 592     while (iold < fds_old_nb || inew < fds_new_nb) {
 593         if (iold < fds_old_nb
 594             && (inew == fds_new_nb
 595                 || memory_region_ioeventfd_before(fds_old[iold],
 596                                                   fds_new[inew]))) {
 597             fd = &fds_old[iold];
 598             section = (MemoryRegionSection) {
 599                 .address_space = as,
 600                 .offset_within_address_space = int128_get64(fd->addr.start),
 601                 .size = int128_get64(fd->addr.size),
 602             };
 603             MEMORY_LISTENER_CALL(eventfd_del, Forward, &section,
 604                                  fd->match_data, fd->data, fd->e);
 605             ++iold;
 606         } else if (inew < fds_new_nb
 607                    && (iold == fds_old_nb
 608                        || memory_region_ioeventfd_before(fds_new[inew],
 609                                                          fds_old[iold]))) {
 610             fd = &fds_new[inew];
 611             section = (MemoryRegionSection) {
 612                 .address_space = as,
 613                 .offset_within_address_space = int128_get64(fd->addr.start),
 614                 .size = int128_get64(fd->addr.size),
 615             };
 616             MEMORY_LISTENER_CALL(eventfd_add, Reverse, &section,
 617                                  fd->match_data, fd->data, fd->e);
 618             ++inew;
 619         } else {
 620             ++iold;
 621             ++inew;
 622         }
 623     }
 624 }
 625
 626 static void address_space_update_ioeventfds(AddressSpace *as)
 627 {
 628     FlatRange *fr;
 629     unsigned ioeventfd_nb = 0;
 630     MemoryRegionIoeventfd *ioeventfds = NULL;
 631     AddrRange tmp;
 632     unsigned i;
 633
 634     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
 635         for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
 636             tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
 637                                   int128_sub(fr->addr.start,
 638                                              int128_make64(fr->offset_in_region)));
 639             if (addrrange_intersects(fr->addr, tmp)) {
 640                 ++ioeventfd_nb;
 641                 ioeventfds = g_realloc(ioeventfds,
 642                                           ioeventfd_nb * sizeof(*ioeventfds));
 643                 ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i];
 644                 ioeventfds[ioeventfd_nb-1].addr = tmp;
 645             }
 646         }
 647     }
 648
 649     address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb,
 650                                      as->ioeventfds, as->ioeventfd_nb);
 651
 652     g_free(as->ioeventfds);
 653     as->ioeventfds = ioeventfds;
 654     as->ioeventfd_nb = ioeventfd_nb;
 655 }
 656
 657 static void address_space_update_topology_pass(AddressSpace *as,
 658                                                FlatView old_view,
 659                                                FlatView new_view,
 660                                                bool adding)
 661 {
 662     unsigned iold, inew;
 663     FlatRange *frold, *frnew;
 664
 665     /* Generate a symmetric difference of the old and new memory maps.
 666      * Kill ranges in the old map, and instantiate ranges in the new map.
 667      */
 668     iold = inew = 0;
 669     while (iold < old_view.nr || inew < new_view.nr) {
 670         if (iold < old_view.nr) {
 671             frold = &old_view.ranges[iold];
 672         } else {
 673             frold = NULL;
 674         }
 675         if (inew < new_view.nr) {
 676             frnew = &new_view.ranges[inew];
 677         } else {
 678             frnew = NULL;
 679         }
 680
 681         if (frold
 682             && (!frnew
 683                 || int128_lt(frold->addr.start, frnew->addr.start)
 684                 || (int128_eq(frold->addr.start, frnew->addr.start)
 685                     && !flatrange_equal(frold, frnew)))) {
 686             /* In old, but (not in new, or in new but attributes changed). */
 687
 688             if (!adding) {
 689                 MEMORY_LISTENER_UPDATE_REGION(frold, as, Reverse, region_del);
 690             }
 691
 692             ++iold;
 693         } else if (frold && frnew && flatrange_equal(frold, frnew)) {
 694             /* In both (logging may have changed) */
 695
 696             if (adding) {
 697                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_nop);
 698                 if (frold->dirty_log_mask && !frnew->dirty_log_mask) {
 699                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Reverse, log_stop);
 700                 } else if (frnew->dirty_log_mask && !frold->dirty_log_mask) {
 701                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, log_start);
 702                 }
 703             }
 704
 705             ++iold;
 706             ++inew;
 707         } else {
 708             /* In new */
 709
 710             if (adding) {
 711                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_add);
 712             }
 713
 714             ++inew;
 715         }
 716     }
 717 }
 718
 719
 720 static void address_space_update_topology(AddressSpace *as)
 721 {
 722     FlatView old_view = *as->current_map;
 723     FlatView new_view = generate_memory_topology(as->root);
 724
 725     address_space_update_topology_pass(as, old_view, new_view, false);
 726     address_space_update_topology_pass(as, old_view, new_view, true);
 727
 728     *as->current_map = new_view;
 729     flatview_destroy(&old_view);
 730     address_space_update_ioeventfds(as);
 731 }
 732
 733 void memory_region_transaction_begin(void)
 734 {
 735     qemu_flush_coalesced_mmio_buffer();
 736     ++memory_region_transaction_depth;
 737 }
 738
 739 void memory_region_transaction_commit(void)
 740 {
 741     AddressSpace *as;
 742
 743     assert(memory_region_transaction_depth);
 744     --memory_region_transaction_depth;
 745     if (!memory_region_transaction_depth && memory_region_update_pending) {
 746         memory_region_update_pending = false;
 747         MEMORY_LISTENER_CALL_GLOBAL(begin, Forward);
 748
 749         QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
 750             address_space_update_topology(as);
 751         }
 752
 753         MEMORY_LISTENER_CALL_GLOBAL(commit, Forward);
 754     }
 755 }
 756
 757 static void memory_region_destructor_none(MemoryRegion *mr)
 758 {
 759 }
 760
 761 static void memory_region_destructor_ram(MemoryRegion *mr)
 762 {
 763     qemu_ram_free(mr->ram_addr);
 764 }
 765
 766 static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
 767 {
 768     qemu_ram_free_from_ptr(mr->ram_addr);
 769 }
 770
 771 static void memory_region_destructor_rom_device(MemoryRegion *mr)
 772 {
 773     qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
 774 }
 775
 776 static bool memory_region_wrong_endianness(MemoryRegion *mr)
 777 {
 778 #ifdef TARGET_WORDS_BIGENDIAN
 779     return mr->ops->endianness == DEVICE_LITTLE_ENDIAN;
 780 #else
 781     return mr->ops->endianness == DEVICE_BIG_ENDIAN;
 782 #endif
 783 }
 784
 785 void memory_region_init(MemoryRegion *mr,
 786                         const char *name,
 787                         uint64_t size)
 788 {
 789     mr->ops = NULL;
 790     mr->parent = NULL;
 791     mr->size = int128_make64(size);
 792     if (size == UINT64_MAX) {
 793         mr->size = int128_2_64();
 794     }
 795     mr->addr = 0;
 796     mr->subpage = false;
 797     mr->enabled = true;
 798     mr->terminates = false;
 799     mr->ram = false;
 800     mr->romd_mode = true;
 801     mr->readonly = false;
 802     mr->rom_device = false;
 803     mr->destructor = memory_region_destructor_none;
 804     mr->priority = 0;
 805     mr->may_overlap = false;
 806     mr->alias = NULL;
 807     QTAILQ_INIT(&mr->subregions);
 808     memset(&mr->subregions_link, 0, sizeof mr->subregions_link);
 809     QTAILQ_INIT(&mr->coalesced);
 810     mr->name = g_strdup(name);
 811     mr->dirty_log_mask = 0;
 812     mr->ioeventfd_nb = 0;
 813     mr->ioeventfds = NULL;
 814     mr->flush_coalesced_mmio = false;
 815 }
 816
 817 static bool memory_region_access_valid(MemoryRegion *mr,
 818                                        hwaddr addr,
 819                                        unsigned size,
 820                                        bool is_write)
 821 {
 822     if (mr->ops->valid.accepts
 823         && !mr->ops->valid.accepts(mr->opaque, addr, size, is_write)) {
 824         return false;
 825     }
 826
 827     if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
 828         return false;
 829     }
 830
 831     /* Treat zero as compatibility all valid */
 832     if (!mr->ops->valid.max_access_size) {
 833         return true;
 834     }
 835
 836     if (size > mr->ops->valid.max_access_size
 837         || size < mr->ops->valid.min_access_size) {
 838         return false;
 839     }
 840     return true;
 841 }
 842
 843 static uint64_t memory_region_dispatch_read1(MemoryRegion *mr,
 844                                              hwaddr addr,
 845                                              unsigned size)
 846 {
 847     uint64_t data = 0;
 848
 849     if (!memory_region_access_valid(mr, addr, size, false)) {
 850         return -1U; /* FIXME: better signalling */
 851     }
 852
 853     if (!mr->ops->read) {
 854         return mr->ops->old_mmio.read[ctz32(size)](mr->opaque, addr);
 855     }
 856
 857     /* FIXME: support unaligned access */
 858     access_with_adjusted_size(addr, &data, size,
 859                               mr->ops->impl.min_access_size,
 860                               mr->ops->impl.max_access_size,
 861                               memory_region_read_accessor, mr);
 862
 863     return data;
 864 }
 865
 866 static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size)
 867 {
 868     if (memory_region_wrong_endianness(mr)) {
 869         switch (size) {
 870         case 1:
 871             break;
 872         case 2:
 873             *data = bswap16(*data);
 874             break;
 875         case 4:
 876             *data = bswap32(*data);
 877             break;
 878         default:
 879             abort();
 880         }
 881     }
 882 }
 883
 884 static uint64_t memory_region_dispatch_read(MemoryRegion *mr,
 885                                             hwaddr addr,
 886                                             unsigned size)
 887 {
 888     uint64_t ret;
 889
 890     ret = memory_region_dispatch_read1(mr, addr, size);
 891     adjust_endianness(mr, &ret, size);
 892     return ret;
 893 }
 894
 895 static void memory_region_dispatch_write(MemoryRegion *mr,
 896                                          hwaddr addr,
 897                                          uint64_t data,
 898                                          unsigned size)
 899 {
 900     if (!memory_region_access_valid(mr, addr, size, true)) {
 901         return; /* FIXME: better signalling */
 902     }
 903
 904     adjust_endianness(mr, &data, size);
 905
 906     if (!mr->ops->write) {
 907         mr->ops->old_mmio.write[ctz32(size)](mr->opaque, addr, data);
 908         return;
 909     }
 910
 911     /* FIXME: support unaligned access */
 912     access_with_adjusted_size(addr, &data, size,
 913                               mr->ops->impl.min_access_size,
 914                               mr->ops->impl.max_access_size,
 915                               memory_region_write_accessor, mr);
 916 }
 917
 918 void memory_region_init_io(MemoryRegion *mr,
 919                            const MemoryRegionOps *ops,
 920                            void *opaque,
 921                            const char *name,
 922                            uint64_t size)
 923 {
 924     memory_region_init(mr, name, size);
 925     mr->ops = ops;
 926     mr->opaque = opaque;
 927     mr->terminates = true;
 928     mr->ram_addr = ~(ram_addr_t)0;
 929 }
 930
 931 void memory_region_init_ram(MemoryRegion *mr,
 932                             const char *name,
 933                             uint64_t size)
 934 {
 935     memory_region_init(mr, name, size);
 936     mr->ram = true;
 937     mr->terminates = true;
 938     mr->destructor = memory_region_destructor_ram;
 939     mr->ram_addr = qemu_ram_alloc(size, mr);
 940 }
 941
 942 void memory_region_init_ram_ptr(MemoryRegion *mr,
 943                                 const char *name,
 944                                 uint64_t size,
 945                                 void *ptr)
 946 {
 947     memory_region_init(mr, name, size);
 948     mr->ram = true;
 949     mr->terminates = true;
 950     mr->destructor = memory_region_destructor_ram_from_ptr;
 951     mr->ram_addr = qemu_ram_alloc_from_ptr(size, ptr, mr);
 952 }
 953
 954 void memory_region_init_alias(MemoryRegion *mr,
 955                               const char *name,
 956                               MemoryRegion *orig,
 957                               hwaddr offset,
 958                               uint64_t size)
 959 {
 960     memory_region_init(mr, name, size);
 961     mr->alias = orig;
 962     mr->alias_offset = offset;
 963 }
 964
 965 void memory_region_init_rom_device(MemoryRegion *mr,
 966                                    const MemoryRegionOps *ops,
 967                                    void *opaque,
 968                                    const char *name,
 969                                    uint64_t size)
 970 {
 971     memory_region_init(mr, name, size);
 972     mr->ops = ops;
 973     mr->opaque = opaque;
 974     mr->terminates = true;
 975     mr->rom_device = true;
 976     mr->destructor = memory_region_destructor_rom_device;
 977     mr->ram_addr = qemu_ram_alloc(size, mr);
 978 }
 979
 980 static uint64_t invalid_read(void *opaque, hwaddr addr,
 981                              unsigned size)
 982 {
 983     MemoryRegion *mr = opaque;
 984
 985     if (!mr->warning_printed) {
 986         fprintf(stderr, "Invalid read from memory region %s\n", mr->name);
 987         mr->warning_printed = true;
 988     }
 989     return -1U;
 990 }
 991
 992 static void invalid_write(void *opaque, hwaddr addr, uint64_t data,
 993                           unsigned size)
 994 {
 995     MemoryRegion *mr = opaque;
 996
 997     if (!mr->warning_printed) {
 998         fprintf(stderr, "Invalid write to memory region %s\n", mr->name);
 999         mr->warning_printed = true;
1000     }
1001 }
1002
1003 static const MemoryRegionOps reservation_ops = {
1004     .read = invalid_read,
1005     .write = invalid_write,
1006     .endianness = DEVICE_NATIVE_ENDIAN,
1007 };
1008
1009 void memory_region_init_reservation(MemoryRegion *mr,
1010                                     const char *name,
1011                                     uint64_t size)
1012 {
1013     memory_region_init_io(mr, &reservation_ops, mr, name, size);
1014 }
1015
1016 void memory_region_destroy(MemoryRegion *mr)
1017 {
1018     assert(QTAILQ_EMPTY(&mr->subregions));
1019     assert(memory_region_transaction_depth == 0);
1020     mr->destructor(mr);
1021     memory_region_clear_coalescing(mr);
1022     g_free((char *)mr->name);
1023     g_free(mr->ioeventfds);
1024 }
1025
1026 uint64_t memory_region_size(MemoryRegion *mr)
1027 {
1028     if (int128_eq(mr->size, int128_2_64())) {
1029         return UINT64_MAX;
1030     }
1031     return int128_get64(mr->size);
1032 }
1033
1034 const char *memory_region_name(MemoryRegion *mr)
1035 {
1036     return mr->name;
1037 }
1038
1039 bool memory_region_is_ram(MemoryRegion *mr)
1040 {
1041     return mr->ram;
1042 }
1043
1044 bool memory_region_is_logging(MemoryRegion *mr)
1045 {
1046     return mr->dirty_log_mask;
1047 }
1048
1049 bool memory_region_is_rom(MemoryRegion *mr)
1050 {
1051     return mr->ram && mr->readonly;
1052 }
1053
1054 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
1055 {
1056     uint8_t mask = 1 << client;
1057
1058     memory_region_transaction_begin();
1059     mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
1060     memory_region_update_pending |= mr->enabled;
1061     memory_region_transaction_commit();
1062 }
1063
1064 bool memory_region_get_dirty(MemoryRegion *mr, hwaddr addr,
1065                              hwaddr size, unsigned client)
1066 {
1067     assert(mr->terminates);
1068     return cpu_physical_memory_get_dirty(mr->ram_addr + addr, size,
1069                                          1 << client);
1070 }
1071
1072 void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,
1073                              hwaddr size)
1074 {
1075     assert(mr->terminates);
1076     return cpu_physical_memory_set_dirty_range(mr->ram_addr + addr, size, -1);
1077 }
1078
1079 bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr,
1080                                         hwaddr size, unsigned client)
1081 {
1082     bool ret;
1083     assert(mr->terminates);
1084     ret = cpu_physical_memory_get_dirty(mr->ram_addr + addr, size,
1085                                         1 << client);
1086     if (ret) {
1087         cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
1088                                         mr->ram_addr + addr + size,
1089                                         1 << client);
1090     }
1091     return ret;
1092 }
1093
1094
1095 void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
1096 {
1097     AddressSpace *as;
1098     FlatRange *fr;
1099
1100     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1101         FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1102             if (fr->mr == mr) {
1103                 MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1104             }
1105         }
1106     }
1107 }
1108
1109 void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
1110 {
1111     if (mr->readonly != readonly) {
1112         memory_region_transaction_begin();
1113         mr->readonly = readonly;
1114         memory_region_update_pending |= mr->enabled;
1115         memory_region_transaction_commit();
1116     }
1117 }
1118
1119 void memory_region_rom_device_set_romd(MemoryRegion *mr, bool romd_mode)
1120 {
1121     if (mr->romd_mode != romd_mode) {
1122         memory_region_transaction_begin();
1123         mr->romd_mode = romd_mode;
1124         memory_region_update_pending |= mr->enabled;
1125         memory_region_transaction_commit();
1126     }
1127 }
1128
1129 void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
1130                                hwaddr size, unsigned client)
1131 {
1132     assert(mr->terminates);
1133     cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
1134                                     mr->ram_addr + addr + size,
1135                                     1 << client);
1136 }
1137
1138 void *memory_region_get_ram_ptr(MemoryRegion *mr)
1139 {
1140     if (mr->alias) {
1141         return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset;
1142     }
1143
1144     assert(mr->terminates);
1145
1146     return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
1147 }
1148
1149 static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as)
1150 {
1151     FlatRange *fr;
1152     CoalescedMemoryRange *cmr;
1153     AddrRange tmp;
1154     MemoryRegionSection section;
1155
1156     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1157         if (fr->mr == mr) {
1158             section = (MemoryRegionSection) {
1159                 .address_space = as,
1160                 .offset_within_address_space = int128_get64(fr->addr.start),
1161                 .size = int128_get64(fr->addr.size),
1162             };
1163
1164             MEMORY_LISTENER_CALL(coalesced_mmio_del, Reverse, &section,
1165                                  int128_get64(fr->addr.start),
1166                                  int128_get64(fr->addr.size));
1167             QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
1168                 tmp = addrrange_shift(cmr->addr,
1169                                       int128_sub(fr->addr.start,
1170                                                  int128_make64(fr->offset_in_region)));
1171                 if (!addrrange_intersects(tmp, fr->addr)) {
1172                     continue;
1173                 }
1174                 tmp = addrrange_intersection(tmp, fr->addr);
1175                 MEMORY_LISTENER_CALL(coalesced_mmio_add, Forward, &section,
1176                                      int128_get64(tmp.start),
1177                                      int128_get64(tmp.size));
1178             }
1179         }
1180     }
1181 }
1182
1183 static void memory_region_update_coalesced_range(MemoryRegion *mr)
1184 {
1185     AddressSpace *as;
1186
1187     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1188         memory_region_update_coalesced_range_as(mr, as);
1189     }
1190 }
1191
1192 void memory_region_set_coalescing(MemoryRegion *mr)
1193 {
1194     memory_region_clear_coalescing(mr);
1195     memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
1196 }
1197
1198 void memory_region_add_coalescing(MemoryRegion *mr,
1199                                   hwaddr offset,
1200                                   uint64_t size)
1201 {
1202     CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
1203
1204     cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
1205     QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
1206     memory_region_update_coalesced_range(mr);
1207     memory_region_set_flush_coalesced(mr);
1208 }
1209
1210 void memory_region_clear_coalescing(MemoryRegion *mr)
1211 {
1212     CoalescedMemoryRange *cmr;
1213
1214     qemu_flush_coalesced_mmio_buffer();
1215     mr->flush_coalesced_mmio = false;
1216
1217     while (!QTAILQ_EMPTY(&mr->coalesced)) {
1218         cmr = QTAILQ_FIRST(&mr->coalesced);
1219         QTAILQ_REMOVE(&mr->coalesced, cmr, link);
1220         g_free(cmr);
1221     }
1222     memory_region_update_coalesced_range(mr);
1223 }
1224
1225 void memory_region_set_flush_coalesced(MemoryRegion *mr)
1226 {
1227     mr->flush_coalesced_mmio = true;
1228 }
1229
1230 void memory_region_clear_flush_coalesced(MemoryRegion *mr)
1231 {
1232     qemu_flush_coalesced_mmio_buffer();
1233     if (QTAILQ_EMPTY(&mr->coalesced)) {
1234         mr->flush_coalesced_mmio = false;
1235     }
1236 }
1237
1238 void memory_region_add_eventfd(MemoryRegion *mr,
1239                                hwaddr addr,
1240                                unsigned size,
1241                                bool match_data,
1242                                uint64_t data,
1243                                EventNotifier *e)
1244 {
1245     MemoryRegionIoeventfd mrfd = {
1246         .addr.start = int128_make64(addr),
1247         .addr.size = int128_make64(size),
1248         .match_data = match_data,
1249         .data = data,
1250         .e = e,
1251     };
1252     unsigned i;
1253
1254     adjust_endianness(mr, &mrfd.data, size);
1255     memory_region_transaction_begin();
1256     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1257         if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
1258             break;
1259         }
1260     }
1261     ++mr->ioeventfd_nb;
1262     mr->ioeventfds = g_realloc(mr->ioeventfds,
1263                                   sizeof(*mr->ioeventfds) * mr->ioeventfd_nb);
1264     memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i],
1265             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i));
1266     mr->ioeventfds[i] = mrfd;
1267     memory_region_update_pending |= mr->enabled;
1268     memory_region_transaction_commit();
1269 }
1270
1271 void memory_region_del_eventfd(MemoryRegion *mr,
1272                                hwaddr addr,
1273                                unsigned size,
1274                                bool match_data,
1275                                uint64_t data,
1276                                EventNotifier *e)
1277 {
1278     MemoryRegionIoeventfd mrfd = {
1279         .addr.start = int128_make64(addr),
1280         .addr.size = int128_make64(size),
1281         .match_data = match_data,
1282         .data = data,
1283         .e = e,
1284     };
1285     unsigned i;
1286
1287     adjust_endianness(mr, &mrfd.data, size);
1288     memory_region_transaction_begin();
1289     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1290         if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {
1291             break;
1292         }
1293     }
1294     assert(i != mr->ioeventfd_nb);
1295     memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1],
1296             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1)));
1297     --mr->ioeventfd_nb;
1298     mr->ioeventfds = g_realloc(mr->ioeventfds,
1299                                   sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1);
1300     memory_region_update_pending |= mr->enabled;
1301     memory_region_transaction_commit();
1302 }
1303
1304 static void memory_region_add_subregion_common(MemoryRegion *mr,
1305                                                hwaddr offset,
1306                                                MemoryRegion *subregion)
1307 {
1308     MemoryRegion *other;
1309
1310     memory_region_transaction_begin();
1311
1312     assert(!subregion->parent);
1313     subregion->parent = mr;
1314     subregion->addr = offset;
1315     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1316         if (subregion->may_overlap || other->may_overlap) {
1317             continue;
1318         }
1319         if (int128_ge(int128_make64(offset),
1320                       int128_add(int128_make64(other->addr), other->size))
1321             || int128_le(int128_add(int128_make64(offset), subregion->size),
1322                          int128_make64(other->addr))) {
1323             continue;
1324         }
1325 #if 0
1326         printf("warning: subregion collision %llx/%llx (%s) "
1327                "vs %llx/%llx (%s)\n",
1328                (unsigned long long)offset,
1329                (unsigned long long)int128_get64(subregion->size),
1330                subregion->name,
1331                (unsigned long long)other->addr,
1332                (unsigned long long)int128_get64(other->size),
1333                other->name);
1334 #endif
1335     }
1336     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1337         if (subregion->priority >= other->priority) {
1338             QTAILQ_INSERT_BEFORE(other, subregion, subregions_link);
1339             goto done;
1340         }
1341     }
1342     QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link);
1343 done:
1344     memory_region_update_pending |= mr->enabled && subregion->enabled;
1345     memory_region_transaction_commit();
1346 }
1347
1348
1349 void memory_region_add_subregion(MemoryRegion *mr,
1350                                  hwaddr offset,
1351                                  MemoryRegion *subregion)
1352 {
1353     subregion->may_overlap = false;
1354     subregion->priority = 0;
1355     memory_region_add_subregion_common(mr, offset, subregion);
1356 }
1357
1358 void memory_region_add_subregion_overlap(MemoryRegion *mr,
1359                                          hwaddr offset,
1360                                          MemoryRegion *subregion,
1361                                          unsigned priority)
1362 {
1363     subregion->may_overlap = true;
1364     subregion->priority = priority;
1365     memory_region_add_subregion_common(mr, offset, subregion);
1366 }
1367
1368 void memory_region_del_subregion(MemoryRegion *mr,
1369                                  MemoryRegion *subregion)
1370 {
1371     memory_region_transaction_begin();
1372     assert(subregion->parent == mr);
1373     subregion->parent = NULL;
1374     QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
1375     memory_region_update_pending |= mr->enabled && subregion->enabled;
1376     memory_region_transaction_commit();
1377 }
1378
1379 void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
1380 {
1381     if (enabled == mr->enabled) {
1382         return;
1383     }
1384     memory_region_transaction_begin();
1385     mr->enabled = enabled;
1386     memory_region_update_pending = true;
1387     memory_region_transaction_commit();
1388 }
1389
1390 void memory_region_set_address(MemoryRegion *mr, hwaddr addr)
1391 {
1392     MemoryRegion *parent = mr->parent;
1393     unsigned priority = mr->priority;
1394     bool may_overlap = mr->may_overlap;
1395
1396     if (addr == mr->addr || !parent) {
1397         mr->addr = addr;
1398         return;
1399     }
1400
1401     memory_region_transaction_begin();
1402     memory_region_del_subregion(parent, mr);
1403     if (may_overlap) {
1404         memory_region_add_subregion_overlap(parent, addr, mr, priority);
1405     } else {
1406         memory_region_add_subregion(parent, addr, mr);
1407     }
1408     memory_region_transaction_commit();
1409 }
1410
1411 void memory_region_set_alias_offset(MemoryRegion *mr, hwaddr offset)
1412 {
1413     assert(mr->alias);
1414
1415     if (offset == mr->alias_offset) {
1416         return;
1417     }
1418
1419     memory_region_transaction_begin();
1420     mr->alias_offset = offset;
1421     memory_region_update_pending |= mr->enabled;
1422     memory_region_transaction_commit();
1423 }
1424
1425 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
1426 {
1427     return mr->ram_addr;
1428 }
1429
1430 static int cmp_flatrange_addr(const void *addr_, const void *fr_)
1431 {
1432     const AddrRange *addr = addr_;
1433     const FlatRange *fr = fr_;
1434
1435     if (int128_le(addrrange_end(*addr), fr->addr.start)) {
1436         return -1;
1437     } else if (int128_ge(addr->start, addrrange_end(fr->addr))) {
1438         return 1;
1439     }
1440     return 0;
1441 }
1442
1443 static FlatRange *address_space_lookup(AddressSpace *as, AddrRange addr)
1444 {
1445     return bsearch(&addr, as->current_map->ranges, as->current_map->nr,
1446                    sizeof(FlatRange), cmp_flatrange_addr);
1447 }
1448
1449 MemoryRegionSection memory_region_find(MemoryRegion *mr,
1450                                        hwaddr addr, uint64_t size)
1451 {
1452     MemoryRegionSection ret = { .mr = NULL, .size = 0 };
1453     MemoryRegion *root;
1454     AddressSpace *as;
1455     AddrRange range;
1456     FlatRange *fr;
1457
1458     addr += mr->addr;
1459     for (root = mr; root->parent; ) {
1460         root = root->parent;
1461         addr += root->addr;
1462     }
1463
1464     as = memory_region_to_address_space(root);
1465     range = addrrange_make(int128_make64(addr), int128_make64(size));
1466     fr = address_space_lookup(as, range);
1467     if (!fr) {
1468         return ret;
1469     }
1470
1471     while (fr > as->current_map->ranges
1472            && addrrange_intersects(fr[-1].addr, range)) {
1473         --fr;
1474     }
1475
1476     ret.mr = fr->mr;
1477     ret.address_space = as;
1478     range = addrrange_intersection(range, fr->addr);
1479     ret.offset_within_region = fr->offset_in_region;
1480     ret.offset_within_region += int128_get64(int128_sub(range.start,
1481                                                         fr->addr.start));
1482     ret.size = int128_get64(range.size);
1483     ret.offset_within_address_space = int128_get64(range.start);
1484     ret.readonly = fr->readonly;
1485     return ret;
1486 }
1487
1488 void address_space_sync_dirty_bitmap(AddressSpace *as)
1489 {
1490     FlatRange *fr;
1491
1492     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1493         MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
1494     }
1495 }
1496
1497 void memory_global_dirty_log_start(void)
1498 {
1499     global_dirty_log = true;
1500     MEMORY_LISTENER_CALL_GLOBAL(log_global_start, Forward);
1501 }
1502
1503 void memory_global_dirty_log_stop(void)
1504 {
1505     global_dirty_log = false;
1506     MEMORY_LISTENER_CALL_GLOBAL(log_global_stop, Reverse);
1507 }
1508
1509 static void listener_add_address_space(MemoryListener *listener,
1510                                        AddressSpace *as)
1511 {
1512     FlatRange *fr;
1513
1514     if (listener->address_space_filter
1515         && listener->address_space_filter != as) {
1516         return;
1517     }
1518
1519     if (global_dirty_log) {
1520         if (listener->log_global_start) {
1521             listener->log_global_start(listener);
1522         }
1523     }
1524
1525     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
1526         MemoryRegionSection section = {
1527             .mr = fr->mr,
1528             .address_space = as,
1529             .offset_within_region = fr->offset_in_region,
1530             .size = int128_get64(fr->addr.size),
1531             .offset_within_address_space = int128_get64(fr->addr.start),
1532             .readonly = fr->readonly,
1533         };
1534         if (listener->region_add) {
1535             listener->region_add(listener, &section);
1536         }
1537     }
1538 }
1539
1540 void memory_listener_register(MemoryListener *listener, AddressSpace *filter)
1541 {
1542     MemoryListener *other = NULL;
1543     AddressSpace *as;
1544
1545     listener->address_space_filter = filter;
1546     if (QTAILQ_EMPTY(&memory_listeners)
1547         || listener->priority >= QTAILQ_LAST(&memory_listeners,
1548                                              memory_listeners)->priority) {
1549         QTAILQ_INSERT_TAIL(&memory_listeners, listener, link);
1550     } else {
1551         QTAILQ_FOREACH(other, &memory_listeners, link) {
1552             if (listener->priority < other->priority) {
1553                 break;
1554             }
1555         }
1556         QTAILQ_INSERT_BEFORE(other, listener, link);
1557     }
1558
1559     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1560         listener_add_address_space(listener, as);
1561     }
1562 }
1563
1564 void memory_listener_unregister(MemoryListener *listener)
1565 {
1566     QTAILQ_REMOVE(&memory_listeners, listener, link);
1567 }
1568
1569 void address_space_init(AddressSpace *as, MemoryRegion *root)
1570 {
1571     memory_region_transaction_begin();
1572     as->root = root;
1573     as->current_map = g_new(FlatView, 1);
1574     flatview_init(as->current_map);
1575     as->ioeventfd_nb = 0;
1576     as->ioeventfds = NULL;
1577     QTAILQ_INSERT_TAIL(&address_spaces, as, address_spaces_link);
1578     as->name = NULL;
1579     address_space_init_dispatch(as);
1580     memory_region_update_pending |= root->enabled;
1581     memory_region_transaction_commit();
1582 }
1583
1584 void address_space_destroy(AddressSpace *as)
1585 {
1586     /* Flush out anything from MemoryListeners listening in on this */
1587     memory_region_transaction_begin();
1588     as->root = NULL;
1589     memory_region_transaction_commit();
1590     QTAILQ_REMOVE(&address_spaces, as, address_spaces_link);
1591     address_space_destroy_dispatch(as);
1592     flatview_destroy(as->current_map);
1593     g_free(as->current_map);
1594     g_free(as->ioeventfds);
1595 }
1596
1597 uint64_t io_mem_read(MemoryRegion *mr, hwaddr addr, unsigned size)
1598 {
1599     return memory_region_dispatch_read(mr, addr, size);
1600 }
1601
1602 void io_mem_write(MemoryRegion *mr, hwaddr addr,
1603                   uint64_t val, unsigned size)
1604 {
1605     memory_region_dispatch_write(mr, addr, val, size);
1606 }
1607
1608 typedef struct MemoryRegionList MemoryRegionList;
1609
1610 struct MemoryRegionList {
1611     const MemoryRegion *mr;
1612     bool printed;
1613     QTAILQ_ENTRY(MemoryRegionList) queue;
1614 };
1615
1616 typedef QTAILQ_HEAD(queue, MemoryRegionList) MemoryRegionListHead;
1617
1618 static void mtree_print_mr(fprintf_function mon_printf, void *f,
1619                            const MemoryRegion *mr, unsigned int level,
1620                            hwaddr base,
1621                            MemoryRegionListHead *alias_print_queue)
1622 {
1623     MemoryRegionList *new_ml, *ml, *next_ml;
1624     MemoryRegionListHead submr_print_queue;
1625     const MemoryRegion *submr;
1626     unsigned int i;
1627
1628     if (!mr || !mr->enabled) {
1629         return;
1630     }
1631
1632     for (i = 0; i < level; i++) {
1633         mon_printf(f, "  ");
1634     }
1635
1636     if (mr->alias) {
1637         MemoryRegionList *ml;
1638         bool found = false;
1639
1640         /* check if the alias is already in the queue */
1641         QTAILQ_FOREACH(ml, alias_print_queue, queue) {
1642             if (ml->mr == mr->alias && !ml->printed) {
1643                 found = true;
1644             }
1645         }
1646
1647         if (!found) {
1648             ml = g_new(MemoryRegionList, 1);
1649             ml->mr = mr->alias;
1650             ml->printed = false;
1651             QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue);
1652         }
1653         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx
1654                    " (prio %d, %c%c): alias %s @%s " TARGET_FMT_plx
1655                    "-" TARGET_FMT_plx "\n",
1656                    base + mr->addr,
1657                    base + mr->addr
1658                    + (hwaddr)int128_get64(mr->size) - 1,
1659                    mr->priority,
1660                    mr->romd_mode ? 'R' : '-',
1661                    !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
1662                                                                        : '-',
1663                    mr->name,
1664                    mr->alias->name,
1665                    mr->alias_offset,
1666                    mr->alias_offset
1667                    + (hwaddr)int128_get64(mr->size) - 1);
1668     } else {
1669         mon_printf(f,
1670                    TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d, %c%c): %s\n",
1671                    base + mr->addr,
1672                    base + mr->addr
1673                    + (hwaddr)int128_get64(mr->size) - 1,
1674                    mr->priority,
1675                    mr->romd_mode ? 'R' : '-',
1676                    !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W'
1677                                                                        : '-',
1678                    mr->name);
1679     }
1680
1681     QTAILQ_INIT(&submr_print_queue);
1682
1683     QTAILQ_FOREACH(submr, &mr->subregions, subregions_link) {
1684         new_ml = g_new(MemoryRegionList, 1);
1685         new_ml->mr = submr;
1686         QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1687             if (new_ml->mr->addr < ml->mr->addr ||
1688                 (new_ml->mr->addr == ml->mr->addr &&
1689                  new_ml->mr->priority > ml->mr->priority)) {
1690                 QTAILQ_INSERT_BEFORE(ml, new_ml, queue);
1691                 new_ml = NULL;
1692                 break;
1693             }
1694         }
1695         if (new_ml) {
1696             QTAILQ_INSERT_TAIL(&submr_print_queue, new_ml, queue);
1697         }
1698     }
1699
1700     QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1701         mtree_print_mr(mon_printf, f, ml->mr, level + 1, base + mr->addr,
1702                        alias_print_queue);
1703     }
1704
1705     QTAILQ_FOREACH_SAFE(ml, &submr_print_queue, queue, next_ml) {
1706         g_free(ml);
1707     }
1708 }
1709
1710 void mtree_info(fprintf_function mon_printf, void *f)
1711 {
1712     MemoryRegionListHead ml_head;
1713     MemoryRegionList *ml, *ml2;
1714     AddressSpace *as;
1715
1716     QTAILQ_INIT(&ml_head);
1717
1718     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
1719         if (!as->name) {
1720             continue;
1721         }
1722         mon_printf(f, "%s\n", as->name);
1723         mtree_print_mr(mon_printf, f, as->root, 0, 0, &ml_head);
1724     }
1725
1726     mon_printf(f, "aliases\n");
1727     /* print aliased regions */
1728     QTAILQ_FOREACH(ml, &ml_head, queue) {
1729         if (!ml->printed) {
1730             mon_printf(f, "%s\n", ml->mr->name);
1731             mtree_print_mr(mon_printf, f, ml->mr, 0, 0, &ml_head);
1732         }
1733     }
1734
1735     QTAILQ_FOREACH_SAFE(ml, &ml_head, queue, ml2) {
1736         g_free(ml);
1737     }
1738 }