memory.c

   1 /*
   2  * Physical memory management
   3  *
   4  * Copyright 2011 Red Hat, Inc. and/or its affiliates
   5  *
   6  * Authors:
   7  *  Avi Kivity <avi@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #include "memory.h"
  15 #include "exec-memory.h"
  16 #include "ioport.h"
  17 #include "bitops.h"
  18 #include "kvm.h"
  19 #include <assert.h>
  20
  21 #define WANT_EXEC_OBSOLETE
  22 #include "exec-obsolete.h"
  23
  24 unsigned memory_region_transaction_depth = 0;
  25 static bool memory_region_update_pending = false;
  26
  27 typedef struct AddrRange AddrRange;
  28
  29 /*
  30  * Note using signed integers limits us to physical addresses at most
  31  * 63 bits wide.  They are needed for negative offsetting in aliases
  32  * (large MemoryRegion::alias_offset).
  33  */
  34 struct AddrRange {
  35     Int128 start;
  36     Int128 size;
  37 };
  38
  39 static AddrRange addrrange_make(Int128 start, Int128 size)
  40 {
  41     return (AddrRange) { start, size };
  42 }
  43
  44 static bool addrrange_equal(AddrRange r1, AddrRange r2)
  45 {
  46     return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
  47 }
  48
  49 static Int128 addrrange_end(AddrRange r)
  50 {
  51     return int128_add(r.start, r.size);
  52 }
  53
  54 static AddrRange addrrange_shift(AddrRange range, Int128 delta)
  55 {
  56     int128_addto(&range.start, delta);
  57     return range;
  58 }
  59
  60 static bool addrrange_contains(AddrRange range, Int128 addr)
  61 {
  62     return int128_ge(addr, range.start)
  63         && int128_lt(addr, addrrange_end(range));
  64 }
  65
  66 static bool addrrange_intersects(AddrRange r1, AddrRange r2)
  67 {
  68     return addrrange_contains(r1, r2.start)
  69         || addrrange_contains(r2, r1.start);
  70 }
  71
  72 static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
  73 {
  74     Int128 start = int128_max(r1.start, r2.start);
  75     Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
  76     return addrrange_make(start, int128_sub(end, start));
  77 }
  78
  79 struct CoalescedMemoryRange {
  80     AddrRange addr;
  81     QTAILQ_ENTRY(CoalescedMemoryRange) link;
  82 };
  83
  84 struct MemoryRegionIoeventfd {
  85     AddrRange addr;
  86     bool match_data;
  87     uint64_t data;
  88     int fd;
  89 };
  90
  91 static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
  92                                            MemoryRegionIoeventfd b)
  93 {
  94     if (int128_lt(a.addr.start, b.addr.start)) {
  95         return true;
  96     } else if (int128_gt(a.addr.start, b.addr.start)) {
  97         return false;
  98     } else if (int128_lt(a.addr.size, b.addr.size)) {
  99         return true;
 100     } else if (int128_gt(a.addr.size, b.addr.size)) {
 101         return false;
 102     } else if (a.match_data < b.match_data) {
 103         return true;
 104     } else  if (a.match_data > b.match_data) {
 105         return false;
 106     } else if (a.match_data) {
 107         if (a.data < b.data) {
 108             return true;
 109         } else if (a.data > b.data) {
 110             return false;
 111         }
 112     }
 113     if (a.fd < b.fd) {
 114         return true;
 115     } else if (a.fd > b.fd) {
 116         return false;
 117     }
 118     return false;
 119 }
 120
 121 static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
 122                                           MemoryRegionIoeventfd b)
 123 {
 124     return !memory_region_ioeventfd_before(a, b)
 125         && !memory_region_ioeventfd_before(b, a);
 126 }
 127
 128 typedef struct FlatRange FlatRange;
 129 typedef struct FlatView FlatView;
 130
 131 /* Range of memory in the global map.  Addresses are absolute. */
 132 struct FlatRange {
 133     MemoryRegion *mr;
 134     target_phys_addr_t offset_in_region;
 135     AddrRange addr;
 136     uint8_t dirty_log_mask;
 137     bool readable;
 138     bool readonly;
 139 };
 140
 141 /* Flattened global view of current active memory hierarchy.  Kept in sorted
 142  * order.
 143  */
 144 struct FlatView {
 145     FlatRange *ranges;
 146     unsigned nr;
 147     unsigned nr_allocated;
 148 };
 149
 150 typedef struct AddressSpace AddressSpace;
 151 typedef struct AddressSpaceOps AddressSpaceOps;
 152
 153 /* A system address space - I/O, memory, etc. */
 154 struct AddressSpace {
 155     const AddressSpaceOps *ops;
 156     MemoryRegion *root;
 157     FlatView current_map;
 158     int ioeventfd_nb;
 159     MemoryRegionIoeventfd *ioeventfds;
 160 };
 161
 162 struct AddressSpaceOps {
 163     void (*range_add)(AddressSpace *as, FlatRange *fr);
 164     void (*range_del)(AddressSpace *as, FlatRange *fr);
 165     void (*log_start)(AddressSpace *as, FlatRange *fr);
 166     void (*log_stop)(AddressSpace *as, FlatRange *fr);
 167     void (*ioeventfd_add)(AddressSpace *as, MemoryRegionIoeventfd *fd);
 168     void (*ioeventfd_del)(AddressSpace *as, MemoryRegionIoeventfd *fd);
 169 };
 170
 171 #define FOR_EACH_FLAT_RANGE(var, view)          \
 172     for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
 173
 174 static bool flatrange_equal(FlatRange *a, FlatRange *b)
 175 {
 176     return a->mr == b->mr
 177         && addrrange_equal(a->addr, b->addr)
 178         && a->offset_in_region == b->offset_in_region
 179         && a->readable == b->readable
 180         && a->readonly == b->readonly;
 181 }
 182
 183 static void flatview_init(FlatView *view)
 184 {
 185     view->ranges = NULL;
 186     view->nr = 0;
 187     view->nr_allocated = 0;
 188 }
 189
 190 /* Insert a range into a given position.  Caller is responsible for maintaining
 191  * sorting order.
 192  */
 193 static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range)
 194 {
 195     if (view->nr == view->nr_allocated) {
 196         view->nr_allocated = MAX(2 * view->nr, 10);
 197         view->ranges = g_realloc(view->ranges,
 198                                     view->nr_allocated * sizeof(*view->ranges));
 199     }
 200     memmove(view->ranges + pos + 1, view->ranges + pos,
 201             (view->nr - pos) * sizeof(FlatRange));
 202     view->ranges[pos] = *range;
 203     ++view->nr;
 204 }
 205
 206 static void flatview_destroy(FlatView *view)
 207 {
 208     g_free(view->ranges);
 209 }
 210
 211 static bool can_merge(FlatRange *r1, FlatRange *r2)
 212 {
 213     return int128_eq(addrrange_end(r1->addr), r2->addr.start)
 214         && r1->mr == r2->mr
 215         && int128_eq(int128_add(int128_make64(r1->offset_in_region),
 216                                 r1->addr.size),
 217                      int128_make64(r2->offset_in_region))
 218         && r1->dirty_log_mask == r2->dirty_log_mask
 219         && r1->readable == r2->readable
 220         && r1->readonly == r2->readonly;
 221 }
 222
 223 /* Attempt to simplify a view by merging ajacent ranges */
 224 static void flatview_simplify(FlatView *view)
 225 {
 226     unsigned i, j;
 227
 228     i = 0;
 229     while (i < view->nr) {
 230         j = i + 1;
 231         while (j < view->nr
 232                && can_merge(&view->ranges[j-1], &view->ranges[j])) {
 233             int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
 234             ++j;
 235         }
 236         ++i;
 237         memmove(&view->ranges[i], &view->ranges[j],
 238                 (view->nr - j) * sizeof(view->ranges[j]));
 239         view->nr -= j - i;
 240     }
 241 }
 242
 243 static void memory_region_read_accessor(void *opaque,
 244                                         target_phys_addr_t addr,
 245                                         uint64_t *value,
 246                                         unsigned size,
 247                                         unsigned shift,
 248                                         uint64_t mask)
 249 {
 250     MemoryRegion *mr = opaque;
 251     uint64_t tmp;
 252
 253     tmp = mr->ops->read(mr->opaque, addr, size);
 254     *value |= (tmp & mask) << shift;
 255 }
 256
 257 static void memory_region_write_accessor(void *opaque,
 258                                          target_phys_addr_t addr,
 259                                          uint64_t *value,
 260                                          unsigned size,
 261                                          unsigned shift,
 262                                          uint64_t mask)
 263 {
 264     MemoryRegion *mr = opaque;
 265     uint64_t tmp;
 266
 267     tmp = (*value >> shift) & mask;
 268     mr->ops->write(mr->opaque, addr, tmp, size);
 269 }
 270
 271 static void access_with_adjusted_size(target_phys_addr_t addr,
 272                                       uint64_t *value,
 273                                       unsigned size,
 274                                       unsigned access_size_min,
 275                                       unsigned access_size_max,
 276                                       void (*access)(void *opaque,
 277                                                      target_phys_addr_t addr,
 278                                                      uint64_t *value,
 279                                                      unsigned size,
 280                                                      unsigned shift,
 281                                                      uint64_t mask),
 282                                       void *opaque)
 283 {
 284     uint64_t access_mask;
 285     unsigned access_size;
 286     unsigned i;
 287
 288     if (!access_size_min) {
 289         access_size_min = 1;
 290     }
 291     if (!access_size_max) {
 292         access_size_max = 4;
 293     }
 294     access_size = MAX(MIN(size, access_size_max), access_size_min);
 295     access_mask = -1ULL >> (64 - access_size * 8);
 296     for (i = 0; i < size; i += access_size) {
 297         /* FIXME: big-endian support */
 298         access(opaque, addr + i, value, access_size, i * 8, access_mask);
 299     }
 300 }
 301
 302 static void memory_region_prepare_ram_addr(MemoryRegion *mr);
 303
 304 static void as_memory_range_add(AddressSpace *as, FlatRange *fr)
 305 {
 306     ram_addr_t phys_offset, region_offset;
 307
 308     memory_region_prepare_ram_addr(fr->mr);
 309
 310     phys_offset = fr->mr->ram_addr;
 311     region_offset = fr->offset_in_region;
 312     /* cpu_register_physical_memory_log() wants region_offset for
 313      * mmio, but prefers offseting phys_offset for RAM.  Humour it.
 314      */
 315     if ((phys_offset & ~TARGET_PAGE_MASK) <= IO_MEM_ROM) {
 316         phys_offset += region_offset;
 317         region_offset = 0;
 318     }
 319
 320     if (!fr->readable) {
 321         phys_offset &= ~TARGET_PAGE_MASK & ~IO_MEM_ROMD;
 322     }
 323
 324     if (fr->readonly) {
 325         phys_offset |= IO_MEM_ROM;
 326     }
 327
 328     cpu_register_physical_memory_log(int128_get64(fr->addr.start),
 329                                      int128_get64(fr->addr.size),
 330                                      phys_offset,
 331                                      region_offset,
 332                                      fr->dirty_log_mask);
 333 }
 334
 335 static void as_memory_range_del(AddressSpace *as, FlatRange *fr)
 336 {
 337     if (fr->dirty_log_mask) {
 338         Int128 end = addrrange_end(fr->addr);
 339         cpu_physical_sync_dirty_bitmap(int128_get64(fr->addr.start),
 340                                        int128_get64(end));
 341     }
 342     cpu_register_physical_memory(int128_get64(fr->addr.start),
 343                                  int128_get64(fr->addr.size),
 344                                  IO_MEM_UNASSIGNED);
 345 }
 346
 347 static void as_memory_log_start(AddressSpace *as, FlatRange *fr)
 348 {
 349     cpu_physical_log_start(int128_get64(fr->addr.start),
 350                            int128_get64(fr->addr.size));
 351 }
 352
 353 static void as_memory_log_stop(AddressSpace *as, FlatRange *fr)
 354 {
 355     cpu_physical_log_stop(int128_get64(fr->addr.start),
 356                           int128_get64(fr->addr.size));
 357 }
 358
 359 static void as_memory_ioeventfd_add(AddressSpace *as, MemoryRegionIoeventfd *fd)
 360 {
 361     int r;
 362
 363     assert(fd->match_data && int128_get64(fd->addr.size) == 4);
 364
 365     r = kvm_set_ioeventfd_mmio_long(fd->fd, int128_get64(fd->addr.start),
 366                                     fd->data, true);
 367     if (r < 0) {
 368         abort();
 369     }
 370 }
 371
 372 static void as_memory_ioeventfd_del(AddressSpace *as, MemoryRegionIoeventfd *fd)
 373 {
 374     int r;
 375
 376     r = kvm_set_ioeventfd_mmio_long(fd->fd, int128_get64(fd->addr.start),
 377                                     fd->data, false);
 378     if (r < 0) {
 379         abort();
 380     }
 381 }
 382
 383 static const AddressSpaceOps address_space_ops_memory = {
 384     .range_add = as_memory_range_add,
 385     .range_del = as_memory_range_del,
 386     .log_start = as_memory_log_start,
 387     .log_stop = as_memory_log_stop,
 388     .ioeventfd_add = as_memory_ioeventfd_add,
 389     .ioeventfd_del = as_memory_ioeventfd_del,
 390 };
 391
 392 static AddressSpace address_space_memory = {
 393     .ops = &address_space_ops_memory,
 394 };
 395
 396 static const MemoryRegionPortio *find_portio(MemoryRegion *mr, uint64_t offset,
 397                                              unsigned width, bool write)
 398 {
 399     const MemoryRegionPortio *mrp;
 400
 401     for (mrp = mr->ops->old_portio; mrp->size; ++mrp) {
 402         if (offset >= mrp->offset && offset < mrp->offset + mrp->len
 403             && width == mrp->size
 404             && (write ? (bool)mrp->write : (bool)mrp->read)) {
 405             return mrp;
 406         }
 407     }
 408     return NULL;
 409 }
 410
 411 static void memory_region_iorange_read(IORange *iorange,
 412                                        uint64_t offset,
 413                                        unsigned width,
 414                                        uint64_t *data)
 415 {
 416     MemoryRegion *mr = container_of(iorange, MemoryRegion, iorange);
 417
 418     if (mr->ops->old_portio) {
 419         const MemoryRegionPortio *mrp = find_portio(mr, offset, width, false);
 420
 421         *data = ((uint64_t)1 << (width * 8)) - 1;
 422         if (mrp) {
 423             *data = mrp->read(mr->opaque, offset + mr->offset);
 424         } else if (width == 2) {
 425             mrp = find_portio(mr, offset, 1, false);
 426             assert(mrp);
 427             *data = mrp->read(mr->opaque, offset + mr->offset) |
 428                     (mrp->read(mr->opaque, offset + mr->offset + 1) << 8);
 429         }
 430         return;
 431     }
 432     *data = 0;
 433     access_with_adjusted_size(offset + mr->offset, data, width,
 434                               mr->ops->impl.min_access_size,
 435                               mr->ops->impl.max_access_size,
 436                               memory_region_read_accessor, mr);
 437 }
 438
 439 static void memory_region_iorange_write(IORange *iorange,
 440                                         uint64_t offset,
 441                                         unsigned width,
 442                                         uint64_t data)
 443 {
 444     MemoryRegion *mr = container_of(iorange, MemoryRegion, iorange);
 445
 446     if (mr->ops->old_portio) {
 447         const MemoryRegionPortio *mrp = find_portio(mr, offset, width, true);
 448
 449         if (mrp) {
 450             mrp->write(mr->opaque, offset + mr->offset, data);
 451         } else if (width == 2) {
 452             mrp = find_portio(mr, offset, 1, false);
 453             assert(mrp);
 454             mrp->write(mr->opaque, offset + mr->offset, data & 0xff);
 455             mrp->write(mr->opaque, offset + mr->offset + 1, data >> 8);
 456         }
 457         return;
 458     }
 459     access_with_adjusted_size(offset + mr->offset, &data, width,
 460                               mr->ops->impl.min_access_size,
 461                               mr->ops->impl.max_access_size,
 462                               memory_region_write_accessor, mr);
 463 }
 464
 465 static const IORangeOps memory_region_iorange_ops = {
 466     .read = memory_region_iorange_read,
 467     .write = memory_region_iorange_write,
 468 };
 469
 470 static void as_io_range_add(AddressSpace *as, FlatRange *fr)
 471 {
 472     iorange_init(&fr->mr->iorange, &memory_region_iorange_ops,
 473                  int128_get64(fr->addr.start), int128_get64(fr->addr.size));
 474     ioport_register(&fr->mr->iorange);
 475 }
 476
 477 static void as_io_range_del(AddressSpace *as, FlatRange *fr)
 478 {
 479     isa_unassign_ioport(int128_get64(fr->addr.start),
 480                         int128_get64(fr->addr.size));
 481 }
 482
 483 static void as_io_ioeventfd_add(AddressSpace *as, MemoryRegionIoeventfd *fd)
 484 {
 485     int r;
 486
 487     assert(fd->match_data && int128_get64(fd->addr.size) == 2);
 488
 489     r = kvm_set_ioeventfd_pio_word(fd->fd, int128_get64(fd->addr.start),
 490                                    fd->data, true);
 491     if (r < 0) {
 492         abort();
 493     }
 494 }
 495
 496 static void as_io_ioeventfd_del(AddressSpace *as, MemoryRegionIoeventfd *fd)
 497 {
 498     int r;
 499
 500     r = kvm_set_ioeventfd_pio_word(fd->fd, int128_get64(fd->addr.start),
 501                                    fd->data, false);
 502     if (r < 0) {
 503         abort();
 504     }
 505 }
 506
 507 static const AddressSpaceOps address_space_ops_io = {
 508     .range_add = as_io_range_add,
 509     .range_del = as_io_range_del,
 510     .ioeventfd_add = as_io_ioeventfd_add,
 511     .ioeventfd_del = as_io_ioeventfd_del,
 512 };
 513
 514 static AddressSpace address_space_io = {
 515     .ops = &address_space_ops_io,
 516 };
 517
 518 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
 519 {
 520     while (mr->parent) {
 521         mr = mr->parent;
 522     }
 523     if (mr == address_space_memory.root) {
 524         return &address_space_memory;
 525     }
 526     if (mr == address_space_io.root) {
 527         return &address_space_io;
 528     }
 529     abort();
 530 }
 531
 532 /* Render a memory region into the global view.  Ranges in @view obscure
 533  * ranges in @mr.
 534  */
 535 static void render_memory_region(FlatView *view,
 536                                  MemoryRegion *mr,
 537                                  Int128 base,
 538                                  AddrRange clip,
 539                                  bool readonly)
 540 {
 541     MemoryRegion *subregion;
 542     unsigned i;
 543     target_phys_addr_t offset_in_region;
 544     Int128 remain;
 545     Int128 now;
 546     FlatRange fr;
 547     AddrRange tmp;
 548
 549     if (!mr->enabled) {
 550         return;
 551     }
 552
 553     int128_addto(&base, int128_make64(mr->addr));
 554     readonly |= mr->readonly;
 555
 556     tmp = addrrange_make(base, mr->size);
 557
 558     if (!addrrange_intersects(tmp, clip)) {
 559         return;
 560     }
 561
 562     clip = addrrange_intersection(tmp, clip);
 563
 564     if (mr->alias) {
 565         int128_subfrom(&base, int128_make64(mr->alias->addr));
 566         int128_subfrom(&base, int128_make64(mr->alias_offset));
 567         render_memory_region(view, mr->alias, base, clip, readonly);
 568         return;
 569     }
 570
 571     /* Render subregions in priority order. */
 572     QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) {
 573         render_memory_region(view, subregion, base, clip, readonly);
 574     }
 575
 576     if (!mr->terminates) {
 577         return;
 578     }
 579
 580     offset_in_region = int128_get64(int128_sub(clip.start, base));
 581     base = clip.start;
 582     remain = clip.size;
 583
 584     /* Render the region itself into any gaps left by the current view. */
 585     for (i = 0; i < view->nr && int128_nz(remain); ++i) {
 586         if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
 587             continue;
 588         }
 589         if (int128_lt(base, view->ranges[i].addr.start)) {
 590             now = int128_min(remain,
 591                              int128_sub(view->ranges[i].addr.start, base));
 592             fr.mr = mr;
 593             fr.offset_in_region = offset_in_region;
 594             fr.addr = addrrange_make(base, now);
 595             fr.dirty_log_mask = mr->dirty_log_mask;
 596             fr.readable = mr->readable;
 597             fr.readonly = readonly;
 598             flatview_insert(view, i, &fr);
 599             ++i;
 600             int128_addto(&base, now);
 601             offset_in_region += int128_get64(now);
 602             int128_subfrom(&remain, now);
 603         }
 604         if (int128_eq(base, view->ranges[i].addr.start)) {
 605             now = int128_min(remain, view->ranges[i].addr.size);
 606             int128_addto(&base, now);
 607             offset_in_region += int128_get64(now);
 608             int128_subfrom(&remain, now);
 609         }
 610     }
 611     if (int128_nz(remain)) {
 612         fr.mr = mr;
 613         fr.offset_in_region = offset_in_region;
 614         fr.addr = addrrange_make(base, remain);
 615         fr.dirty_log_mask = mr->dirty_log_mask;
 616         fr.readable = mr->readable;
 617         fr.readonly = readonly;
 618         flatview_insert(view, i, &fr);
 619     }
 620 }
 621
 622 /* Render a memory topology into a list of disjoint absolute ranges. */
 623 static FlatView generate_memory_topology(MemoryRegion *mr)
 624 {
 625     FlatView view;
 626
 627     flatview_init(&view);
 628
 629     render_memory_region(&view, mr, int128_zero(),
 630                          addrrange_make(int128_zero(), int128_2_64()), false);
 631     flatview_simplify(&view);
 632
 633     return view;
 634 }
 635
 636 static void address_space_add_del_ioeventfds(AddressSpace *as,
 637                                              MemoryRegionIoeventfd *fds_new,
 638                                              unsigned fds_new_nb,
 639                                              MemoryRegionIoeventfd *fds_old,
 640                                              unsigned fds_old_nb)
 641 {
 642     unsigned iold, inew;
 643
 644     /* Generate a symmetric difference of the old and new fd sets, adding
 645      * and deleting as necessary.
 646      */
 647
 648     iold = inew = 0;
 649     while (iold < fds_old_nb || inew < fds_new_nb) {
 650         if (iold < fds_old_nb
 651             && (inew == fds_new_nb
 652                 || memory_region_ioeventfd_before(fds_old[iold],
 653                                                   fds_new[inew]))) {
 654             as->ops->ioeventfd_del(as, &fds_old[iold]);
 655             ++iold;
 656         } else if (inew < fds_new_nb
 657                    && (iold == fds_old_nb
 658                        || memory_region_ioeventfd_before(fds_new[inew],
 659                                                          fds_old[iold]))) {
 660             as->ops->ioeventfd_add(as, &fds_new[inew]);
 661             ++inew;
 662         } else {
 663             ++iold;
 664             ++inew;
 665         }
 666     }
 667 }
 668
 669 static void address_space_update_ioeventfds(AddressSpace *as)
 670 {
 671     FlatRange *fr;
 672     unsigned ioeventfd_nb = 0;
 673     MemoryRegionIoeventfd *ioeventfds = NULL;
 674     AddrRange tmp;
 675     unsigned i;
 676
 677     FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
 678         for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
 679             tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
 680                                   int128_sub(fr->addr.start,
 681                                              int128_make64(fr->offset_in_region)));
 682             if (addrrange_intersects(fr->addr, tmp)) {
 683                 ++ioeventfd_nb;
 684                 ioeventfds = g_realloc(ioeventfds,
 685                                           ioeventfd_nb * sizeof(*ioeventfds));
 686                 ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i];
 687                 ioeventfds[ioeventfd_nb-1].addr = tmp;
 688             }
 689         }
 690     }
 691
 692     address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb,
 693                                      as->ioeventfds, as->ioeventfd_nb);
 694
 695     g_free(as->ioeventfds);
 696     as->ioeventfds = ioeventfds;
 697     as->ioeventfd_nb = ioeventfd_nb;
 698 }
 699
 700 static void address_space_update_topology_pass(AddressSpace *as,
 701                                                FlatView old_view,
 702                                                FlatView new_view,
 703                                                bool adding)
 704 {
 705     unsigned iold, inew;
 706     FlatRange *frold, *frnew;
 707
 708     /* Generate a symmetric difference of the old and new memory maps.
 709      * Kill ranges in the old map, and instantiate ranges in the new map.
 710      */
 711     iold = inew = 0;
 712     while (iold < old_view.nr || inew < new_view.nr) {
 713         if (iold < old_view.nr) {
 714             frold = &old_view.ranges[iold];
 715         } else {
 716             frold = NULL;
 717         }
 718         if (inew < new_view.nr) {
 719             frnew = &new_view.ranges[inew];
 720         } else {
 721             frnew = NULL;
 722         }
 723
 724         if (frold
 725             && (!frnew
 726                 || int128_lt(frold->addr.start, frnew->addr.start)
 727                 || (int128_eq(frold->addr.start, frnew->addr.start)
 728                     && !flatrange_equal(frold, frnew)))) {
 729             /* In old, but (not in new, or in new but attributes changed). */
 730
 731             if (!adding) {
 732                 as->ops->range_del(as, frold);
 733             }
 734
 735             ++iold;
 736         } else if (frold && frnew && flatrange_equal(frold, frnew)) {
 737             /* In both (logging may have changed) */
 738
 739             if (adding) {
 740                 if (frold->dirty_log_mask && !frnew->dirty_log_mask) {
 741                     as->ops->log_stop(as, frnew);
 742                 } else if (frnew->dirty_log_mask && !frold->dirty_log_mask) {
 743                     as->ops->log_start(as, frnew);
 744                 }
 745             }
 746
 747             ++iold;
 748             ++inew;
 749         } else {
 750             /* In new */
 751
 752             if (adding) {
 753                 as->ops->range_add(as, frnew);
 754             }
 755
 756             ++inew;
 757         }
 758     }
 759 }
 760
 761
 762 static void address_space_update_topology(AddressSpace *as)
 763 {
 764     FlatView old_view = as->current_map;
 765     FlatView new_view = generate_memory_topology(as->root);
 766
 767     address_space_update_topology_pass(as, old_view, new_view, false);
 768     address_space_update_topology_pass(as, old_view, new_view, true);
 769
 770     as->current_map = new_view;
 771     flatview_destroy(&old_view);
 772     address_space_update_ioeventfds(as);
 773 }
 774
 775 static void memory_region_update_topology(MemoryRegion *mr)
 776 {
 777     if (memory_region_transaction_depth) {
 778         memory_region_update_pending |= !mr || mr->enabled;
 779         return;
 780     }
 781
 782     if (mr && !mr->enabled) {
 783         return;
 784     }
 785
 786     if (address_space_memory.root) {
 787         address_space_update_topology(&address_space_memory);
 788     }
 789     if (address_space_io.root) {
 790         address_space_update_topology(&address_space_io);
 791     }
 792
 793     memory_region_update_pending = false;
 794 }
 795
 796 void memory_region_transaction_begin(void)
 797 {
 798     ++memory_region_transaction_depth;
 799 }
 800
 801 void memory_region_transaction_commit(void)
 802 {
 803     assert(memory_region_transaction_depth);
 804     --memory_region_transaction_depth;
 805     if (!memory_region_transaction_depth && memory_region_update_pending) {
 806         memory_region_update_topology(NULL);
 807     }
 808 }
 809
 810 static void memory_region_destructor_none(MemoryRegion *mr)
 811 {
 812 }
 813
 814 static void memory_region_destructor_ram(MemoryRegion *mr)
 815 {
 816     qemu_ram_free(mr->ram_addr);
 817 }
 818
 819 static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
 820 {
 821     qemu_ram_free_from_ptr(mr->ram_addr);
 822 }
 823
 824 static void memory_region_destructor_iomem(MemoryRegion *mr)
 825 {
 826     cpu_unregister_io_memory(mr->ram_addr);
 827 }
 828
 829 static void memory_region_destructor_rom_device(MemoryRegion *mr)
 830 {
 831     qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
 832     cpu_unregister_io_memory(mr->ram_addr & ~(TARGET_PAGE_MASK | IO_MEM_ROMD));
 833 }
 834
 835 void memory_region_init(MemoryRegion *mr,
 836                         const char *name,
 837                         uint64_t size)
 838 {
 839     mr->ops = NULL;
 840     mr->parent = NULL;
 841     mr->size = int128_make64(size);
 842     if (size == UINT64_MAX) {
 843         mr->size = int128_2_64();
 844     }
 845     mr->addr = 0;
 846     mr->offset = 0;
 847     mr->enabled = true;
 848     mr->terminates = false;
 849     mr->ram = false;
 850     mr->readable = true;
 851     mr->readonly = false;
 852     mr->destructor = memory_region_destructor_none;
 853     mr->priority = 0;
 854     mr->may_overlap = false;
 855     mr->alias = NULL;
 856     QTAILQ_INIT(&mr->subregions);
 857     memset(&mr->subregions_link, 0, sizeof mr->subregions_link);
 858     QTAILQ_INIT(&mr->coalesced);
 859     mr->name = g_strdup(name);
 860     mr->dirty_log_mask = 0;
 861     mr->ioeventfd_nb = 0;
 862     mr->ioeventfds = NULL;
 863 }
 864
 865 static bool memory_region_access_valid(MemoryRegion *mr,
 866                                        target_phys_addr_t addr,
 867                                        unsigned size,
 868                                        bool is_write)
 869 {
 870     if (mr->ops->valid.accepts
 871         && !mr->ops->valid.accepts(mr->opaque, addr, size, is_write)) {
 872         return false;
 873     }
 874
 875     if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
 876         return false;
 877     }
 878
 879     /* Treat zero as compatibility all valid */
 880     if (!mr->ops->valid.max_access_size) {
 881         return true;
 882     }
 883
 884     if (size > mr->ops->valid.max_access_size
 885         || size < mr->ops->valid.min_access_size) {
 886         return false;
 887     }
 888     return true;
 889 }
 890
 891 static uint32_t memory_region_read_thunk_n(void *_mr,
 892                                            target_phys_addr_t addr,
 893                                            unsigned size)
 894 {
 895     MemoryRegion *mr = _mr;
 896     uint64_t data = 0;
 897
 898     if (!memory_region_access_valid(mr, addr, size, false)) {
 899         return -1U; /* FIXME: better signalling */
 900     }
 901
 902     if (!mr->ops->read) {
 903         return mr->ops->old_mmio.read[bitops_ffsl(size)](mr->opaque, addr);
 904     }
 905
 906     /* FIXME: support unaligned access */
 907     access_with_adjusted_size(addr + mr->offset, &data, size,
 908                               mr->ops->impl.min_access_size,
 909                               mr->ops->impl.max_access_size,
 910                               memory_region_read_accessor, mr);
 911
 912     return data;
 913 }
 914
 915 static void memory_region_write_thunk_n(void *_mr,
 916                                         target_phys_addr_t addr,
 917                                         unsigned size,
 918                                         uint64_t data)
 919 {
 920     MemoryRegion *mr = _mr;
 921
 922     if (!memory_region_access_valid(mr, addr, size, true)) {
 923         return; /* FIXME: better signalling */
 924     }
 925
 926     if (!mr->ops->write) {
 927         mr->ops->old_mmio.write[bitops_ffsl(size)](mr->opaque, addr, data);
 928         return;
 929     }
 930
 931     /* FIXME: support unaligned access */
 932     access_with_adjusted_size(addr + mr->offset, &data, size,
 933                               mr->ops->impl.min_access_size,
 934                               mr->ops->impl.max_access_size,
 935                               memory_region_write_accessor, mr);
 936 }
 937
 938 static uint32_t memory_region_read_thunk_b(void *mr, target_phys_addr_t addr)
 939 {
 940     return memory_region_read_thunk_n(mr, addr, 1);
 941 }
 942
 943 static uint32_t memory_region_read_thunk_w(void *mr, target_phys_addr_t addr)
 944 {
 945     return memory_region_read_thunk_n(mr, addr, 2);
 946 }
 947
 948 static uint32_t memory_region_read_thunk_l(void *mr, target_phys_addr_t addr)
 949 {
 950     return memory_region_read_thunk_n(mr, addr, 4);
 951 }
 952
 953 static void memory_region_write_thunk_b(void *mr, target_phys_addr_t addr,
 954                                         uint32_t data)
 955 {
 956     memory_region_write_thunk_n(mr, addr, 1, data);
 957 }
 958
 959 static void memory_region_write_thunk_w(void *mr, target_phys_addr_t addr,
 960                                         uint32_t data)
 961 {
 962     memory_region_write_thunk_n(mr, addr, 2, data);
 963 }
 964
 965 static void memory_region_write_thunk_l(void *mr, target_phys_addr_t addr,
 966                                         uint32_t data)
 967 {
 968     memory_region_write_thunk_n(mr, addr, 4, data);
 969 }
 970
 971 static CPUReadMemoryFunc * const memory_region_read_thunk[] = {
 972     memory_region_read_thunk_b,
 973     memory_region_read_thunk_w,
 974     memory_region_read_thunk_l,
 975 };
 976
 977 static CPUWriteMemoryFunc * const memory_region_write_thunk[] = {
 978     memory_region_write_thunk_b,
 979     memory_region_write_thunk_w,
 980     memory_region_write_thunk_l,
 981 };
 982
 983 static void memory_region_prepare_ram_addr(MemoryRegion *mr)
 984 {
 985     if (mr->backend_registered) {
 986         return;
 987     }
 988
 989     mr->destructor = memory_region_destructor_iomem;
 990     mr->ram_addr = cpu_register_io_memory(memory_region_read_thunk,
 991                                           memory_region_write_thunk,
 992                                           mr,
 993                                           mr->ops->endianness);
 994     mr->backend_registered = true;
 995 }
 996
 997 void memory_region_init_io(MemoryRegion *mr,
 998                            const MemoryRegionOps *ops,
 999                            void *opaque,
1000                            const char *name,
1001                            uint64_t size)
1002 {
1003     memory_region_init(mr, name, size);
1004     mr->ops = ops;
1005     mr->opaque = opaque;
1006     mr->terminates = true;
1007     mr->backend_registered = false;
1008 }
1009
1010 void memory_region_init_ram(MemoryRegion *mr,
1011                             DeviceState *dev,
1012                             const char *name,
1013                             uint64_t size)
1014 {
1015     memory_region_init(mr, name, size);
1016     mr->ram = true;
1017     mr->terminates = true;
1018     mr->destructor = memory_region_destructor_ram;
1019     mr->ram_addr = qemu_ram_alloc(dev, name, size, mr);
1020     mr->backend_registered = true;
1021 }
1022
1023 void memory_region_init_ram_ptr(MemoryRegion *mr,
1024                                 DeviceState *dev,
1025                                 const char *name,
1026                                 uint64_t size,
1027                                 void *ptr)
1028 {
1029     memory_region_init(mr, name, size);
1030     mr->ram = true;
1031     mr->terminates = true;
1032     mr->destructor = memory_region_destructor_ram_from_ptr;
1033     mr->ram_addr = qemu_ram_alloc_from_ptr(dev, name, size, ptr, mr);
1034     mr->backend_registered = true;
1035 }
1036
1037 void memory_region_init_alias(MemoryRegion *mr,
1038                               const char *name,
1039                               MemoryRegion *orig,
1040                               target_phys_addr_t offset,
1041                               uint64_t size)
1042 {
1043     memory_region_init(mr, name, size);
1044     mr->alias = orig;
1045     mr->alias_offset = offset;
1046 }
1047
1048 void memory_region_init_rom_device(MemoryRegion *mr,
1049                                    const MemoryRegionOps *ops,
1050                                    void *opaque,
1051                                    DeviceState *dev,
1052                                    const char *name,
1053                                    uint64_t size)
1054 {
1055     memory_region_init(mr, name, size);
1056     mr->ops = ops;
1057     mr->opaque = opaque;
1058     mr->terminates = true;
1059     mr->destructor = memory_region_destructor_rom_device;
1060     mr->ram_addr = qemu_ram_alloc(dev, name, size, mr);
1061     mr->ram_addr |= cpu_register_io_memory(memory_region_read_thunk,
1062                                            memory_region_write_thunk,
1063                                            mr,
1064                                            mr->ops->endianness);
1065     mr->ram_addr |= IO_MEM_ROMD;
1066     mr->backend_registered = true;
1067 }
1068
1069 void memory_region_destroy(MemoryRegion *mr)
1070 {
1071     assert(QTAILQ_EMPTY(&mr->subregions));
1072     mr->destructor(mr);
1073     memory_region_clear_coalescing(mr);
1074     g_free((char *)mr->name);
1075     g_free(mr->ioeventfds);
1076 }
1077
1078 uint64_t memory_region_size(MemoryRegion *mr)
1079 {
1080     if (int128_eq(mr->size, int128_2_64())) {
1081         return UINT64_MAX;
1082     }
1083     return int128_get64(mr->size);
1084 }
1085
1086 bool memory_region_is_ram(MemoryRegion *mr)
1087 {
1088     return mr->ram;
1089 }
1090
1091 bool memory_region_is_logging(MemoryRegion *mr)
1092 {
1093     return mr->dirty_log_mask;
1094 }
1095
1096 bool memory_region_is_rom(MemoryRegion *mr)
1097 {
1098     return mr->ram && mr->readonly;
1099 }
1100
1101 void memory_region_set_offset(MemoryRegion *mr, target_phys_addr_t offset)
1102 {
1103     mr->offset = offset;
1104 }
1105
1106 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
1107 {
1108     uint8_t mask = 1 << client;
1109
1110     mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
1111     memory_region_update_topology(mr);
1112 }
1113
1114 bool memory_region_get_dirty(MemoryRegion *mr, target_phys_addr_t addr,
1115                              unsigned client)
1116 {
1117     assert(mr->terminates);
1118     return cpu_physical_memory_get_dirty(mr->ram_addr + addr, 1 << client);
1119 }
1120
1121 void memory_region_set_dirty(MemoryRegion *mr, target_phys_addr_t addr)
1122 {
1123     assert(mr->terminates);
1124     return cpu_physical_memory_set_dirty(mr->ram_addr + addr);
1125 }
1126
1127 void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
1128 {
1129     FlatRange *fr;
1130
1131     FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
1132         if (fr->mr == mr) {
1133             cpu_physical_sync_dirty_bitmap(int128_get64(fr->addr.start),
1134                                            int128_get64(addrrange_end(fr->addr)));
1135         }
1136     }
1137 }
1138
1139 void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
1140 {
1141     if (mr->readonly != readonly) {
1142         mr->readonly = readonly;
1143         memory_region_update_topology(mr);
1144     }
1145 }
1146
1147 void memory_region_rom_device_set_readable(MemoryRegion *mr, bool readable)
1148 {
1149     if (mr->readable != readable) {
1150         mr->readable = readable;
1151         memory_region_update_topology(mr);
1152     }
1153 }
1154
1155 void memory_region_reset_dirty(MemoryRegion *mr, target_phys_addr_t addr,
1156                                target_phys_addr_t size, unsigned client)
1157 {
1158     assert(mr->terminates);
1159     cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
1160                                     mr->ram_addr + addr + size,
1161                                     1 << client);
1162 }
1163
1164 void *memory_region_get_ram_ptr(MemoryRegion *mr)
1165 {
1166     if (mr->alias) {
1167         return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset;
1168     }
1169
1170     assert(mr->terminates);
1171
1172     return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
1173 }
1174
1175 static void memory_region_update_coalesced_range(MemoryRegion *mr)
1176 {
1177     FlatRange *fr;
1178     CoalescedMemoryRange *cmr;
1179     AddrRange tmp;
1180
1181     FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
1182         if (fr->mr == mr) {
1183             qemu_unregister_coalesced_mmio(int128_get64(fr->addr.start),
1184                                            int128_get64(fr->addr.size));
1185             QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
1186                 tmp = addrrange_shift(cmr->addr,
1187                                       int128_sub(fr->addr.start,
1188                                                  int128_make64(fr->offset_in_region)));
1189                 if (!addrrange_intersects(tmp, fr->addr)) {
1190                     continue;
1191                 }
1192                 tmp = addrrange_intersection(tmp, fr->addr);
1193                 qemu_register_coalesced_mmio(int128_get64(tmp.start),
1194                                              int128_get64(tmp.size));
1195             }
1196         }
1197     }
1198 }
1199
1200 void memory_region_set_coalescing(MemoryRegion *mr)
1201 {
1202     memory_region_clear_coalescing(mr);
1203     memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
1204 }
1205
1206 void memory_region_add_coalescing(MemoryRegion *mr,
1207                                   target_phys_addr_t offset,
1208                                   uint64_t size)
1209 {
1210     CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
1211
1212     cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
1213     QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
1214     memory_region_update_coalesced_range(mr);
1215 }
1216
1217 void memory_region_clear_coalescing(MemoryRegion *mr)
1218 {
1219     CoalescedMemoryRange *cmr;
1220
1221     while (!QTAILQ_EMPTY(&mr->coalesced)) {
1222         cmr = QTAILQ_FIRST(&mr->coalesced);
1223         QTAILQ_REMOVE(&mr->coalesced, cmr, link);
1224         g_free(cmr);
1225     }
1226     memory_region_update_coalesced_range(mr);
1227 }
1228
1229 void memory_region_add_eventfd(MemoryRegion *mr,
1230                                target_phys_addr_t addr,
1231                                unsigned size,
1232                                bool match_data,
1233                                uint64_t data,
1234                                int fd)
1235 {
1236     MemoryRegionIoeventfd mrfd = {
1237         .addr.start = int128_make64(addr),
1238         .addr.size = int128_make64(size),
1239         .match_data = match_data,
1240         .data = data,
1241         .fd = fd,
1242     };
1243     unsigned i;
1244
1245     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1246         if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
1247             break;
1248         }
1249     }
1250     ++mr->ioeventfd_nb;
1251     mr->ioeventfds = g_realloc(mr->ioeventfds,
1252                                   sizeof(*mr->ioeventfds) * mr->ioeventfd_nb);
1253     memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i],
1254             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i));
1255     mr->ioeventfds[i] = mrfd;
1256     memory_region_update_topology(mr);
1257 }
1258
1259 void memory_region_del_eventfd(MemoryRegion *mr,
1260                                target_phys_addr_t addr,
1261                                unsigned size,
1262                                bool match_data,
1263                                uint64_t data,
1264                                int fd)
1265 {
1266     MemoryRegionIoeventfd mrfd = {
1267         .addr.start = int128_make64(addr),
1268         .addr.size = int128_make64(size),
1269         .match_data = match_data,
1270         .data = data,
1271         .fd = fd,
1272     };
1273     unsigned i;
1274
1275     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1276         if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {
1277             break;
1278         }
1279     }
1280     assert(i != mr->ioeventfd_nb);
1281     memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1],
1282             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1)));
1283     --mr->ioeventfd_nb;
1284     mr->ioeventfds = g_realloc(mr->ioeventfds,
1285                                   sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1);
1286     memory_region_update_topology(mr);
1287 }
1288
1289 static void memory_region_add_subregion_common(MemoryRegion *mr,
1290                                                target_phys_addr_t offset,
1291                                                MemoryRegion *subregion)
1292 {
1293     MemoryRegion *other;
1294
1295     assert(!subregion->parent);
1296     subregion->parent = mr;
1297     subregion->addr = offset;
1298     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1299         if (subregion->may_overlap || other->may_overlap) {
1300             continue;
1301         }
1302         if (int128_gt(int128_make64(offset),
1303                       int128_add(int128_make64(other->addr), other->size))
1304             || int128_le(int128_add(int128_make64(offset), subregion->size),
1305                          int128_make64(other->addr))) {
1306             continue;
1307         }
1308 #if 0
1309         printf("warning: subregion collision %llx/%llx (%s) "
1310                "vs %llx/%llx (%s)\n",
1311                (unsigned long long)offset,
1312                (unsigned long long)int128_get64(subregion->size),
1313                subregion->name,
1314                (unsigned long long)other->addr,
1315                (unsigned long long)int128_get64(other->size),
1316                other->name);
1317 #endif
1318     }
1319     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1320         if (subregion->priority >= other->priority) {
1321             QTAILQ_INSERT_BEFORE(other, subregion, subregions_link);
1322             goto done;
1323         }
1324     }
1325     QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link);
1326 done:
1327     memory_region_update_topology(mr);
1328 }
1329
1330
1331 void memory_region_add_subregion(MemoryRegion *mr,
1332                                  target_phys_addr_t offset,
1333                                  MemoryRegion *subregion)
1334 {
1335     subregion->may_overlap = false;
1336     subregion->priority = 0;
1337     memory_region_add_subregion_common(mr, offset, subregion);
1338 }
1339
1340 void memory_region_add_subregion_overlap(MemoryRegion *mr,
1341                                          target_phys_addr_t offset,
1342                                          MemoryRegion *subregion,
1343                                          unsigned priority)
1344 {
1345     subregion->may_overlap = true;
1346     subregion->priority = priority;
1347     memory_region_add_subregion_common(mr, offset, subregion);
1348 }
1349
1350 void memory_region_del_subregion(MemoryRegion *mr,
1351                                  MemoryRegion *subregion)
1352 {
1353     assert(subregion->parent == mr);
1354     subregion->parent = NULL;
1355     QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
1356     memory_region_update_topology(mr);
1357 }
1358
1359 void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
1360 {
1361     if (enabled == mr->enabled) {
1362         return;
1363     }
1364     mr->enabled = enabled;
1365     memory_region_update_topology(NULL);
1366 }
1367
1368 void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr)
1369 {
1370     MemoryRegion *parent = mr->parent;
1371     unsigned priority = mr->priority;
1372     bool may_overlap = mr->may_overlap;
1373
1374     if (addr == mr->addr || !parent) {
1375         mr->addr = addr;
1376         return;
1377     }
1378
1379     memory_region_transaction_begin();
1380     memory_region_del_subregion(parent, mr);
1381     if (may_overlap) {
1382         memory_region_add_subregion_overlap(parent, addr, mr, priority);
1383     } else {
1384         memory_region_add_subregion(parent, addr, mr);
1385     }
1386     memory_region_transaction_commit();
1387 }
1388
1389 void memory_region_set_alias_offset(MemoryRegion *mr, target_phys_addr_t offset)
1390 {
1391     target_phys_addr_t old_offset = mr->alias_offset;
1392
1393     assert(mr->alias);
1394     mr->alias_offset = offset;
1395
1396     if (offset == old_offset || !mr->parent) {
1397         return;
1398     }
1399
1400     memory_region_update_topology(mr);
1401 }
1402
1403 static int cmp_flatrange_addr(const void *addr_, const void *fr_)
1404 {
1405     const AddrRange *addr = addr_;
1406     const FlatRange *fr = fr_;
1407
1408     if (int128_le(addrrange_end(*addr), fr->addr.start)) {
1409         return -1;
1410     } else if (int128_ge(addr->start, addrrange_end(fr->addr))) {
1411         return 1;
1412     }
1413     return 0;
1414 }
1415
1416 static FlatRange *address_space_lookup(AddressSpace *as, AddrRange addr)
1417 {
1418     return bsearch(&addr, as->current_map.ranges, as->current_map.nr,
1419                    sizeof(FlatRange), cmp_flatrange_addr);
1420 }
1421
1422 MemoryRegionSection memory_region_find(MemoryRegion *address_space,
1423                                        target_phys_addr_t addr, uint64_t size)
1424 {
1425     AddressSpace *as = memory_region_to_address_space(address_space);
1426     AddrRange range = addrrange_make(int128_make64(addr),
1427                                      int128_make64(size));
1428     FlatRange *fr = address_space_lookup(as, range);
1429     MemoryRegionSection ret = { .mr = NULL, .size = 0 };
1430
1431     if (!fr) {
1432         return ret;
1433     }
1434
1435     while (fr > as->current_map.ranges
1436            && addrrange_intersects(fr[-1].addr, range)) {
1437         --fr;
1438     }
1439
1440     ret.mr = fr->mr;
1441     range = addrrange_intersection(range, fr->addr);
1442     ret.offset_within_region = fr->offset_in_region;
1443     ret.offset_within_region += int128_get64(int128_sub(range.start,
1444                                                         fr->addr.start));
1445     ret.size = int128_get64(range.size);
1446     ret.offset_within_address_space = int128_get64(range.start);
1447     return ret;
1448 }
1449
1450 void memory_global_sync_dirty_bitmap(MemoryRegion *address_space)
1451 {
1452     cpu_physical_sync_dirty_bitmap(0, TARGET_PHYS_ADDR_MAX);
1453 }
1454
1455 void set_system_memory_map(MemoryRegion *mr)
1456 {
1457     address_space_memory.root = mr;
1458     memory_region_update_topology(NULL);
1459 }
1460
1461 void set_system_io_map(MemoryRegion *mr)
1462 {
1463     address_space_io.root = mr;
1464     memory_region_update_topology(NULL);
1465 }
1466
1467 typedef struct MemoryRegionList MemoryRegionList;
1468
1469 struct MemoryRegionList {
1470     const MemoryRegion *mr;
1471     bool printed;
1472     QTAILQ_ENTRY(MemoryRegionList) queue;
1473 };
1474
1475 typedef QTAILQ_HEAD(queue, MemoryRegionList) MemoryRegionListHead;
1476
1477 static void mtree_print_mr(fprintf_function mon_printf, void *f,
1478                            const MemoryRegion *mr, unsigned int level,
1479                            target_phys_addr_t base,
1480                            MemoryRegionListHead *alias_print_queue)
1481 {
1482     MemoryRegionList *new_ml, *ml, *next_ml;
1483     MemoryRegionListHead submr_print_queue;
1484     const MemoryRegion *submr;
1485     unsigned int i;
1486
1487     if (!mr) {
1488         return;
1489     }
1490
1491     for (i = 0; i < level; i++) {
1492         mon_printf(f, "  ");
1493     }
1494
1495     if (mr->alias) {
1496         MemoryRegionList *ml;
1497         bool found = false;
1498
1499         /* check if the alias is already in the queue */
1500         QTAILQ_FOREACH(ml, alias_print_queue, queue) {
1501             if (ml->mr == mr->alias && !ml->printed) {
1502                 found = true;
1503             }
1504         }
1505
1506         if (!found) {
1507             ml = g_new(MemoryRegionList, 1);
1508             ml->mr = mr->alias;
1509             ml->printed = false;
1510             QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue);
1511         }
1512         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d): alias %s @%s "
1513                    TARGET_FMT_plx "-" TARGET_FMT_plx "\n",
1514                    base + mr->addr,
1515                    base + mr->addr
1516                    + (target_phys_addr_t)int128_get64(mr->size) - 1,
1517                    mr->priority,
1518                    mr->name,
1519                    mr->alias->name,
1520                    mr->alias_offset,
1521                    mr->alias_offset
1522                    + (target_phys_addr_t)int128_get64(mr->size) - 1);
1523     } else {
1524         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d): %s\n",
1525                    base + mr->addr,
1526                    base + mr->addr
1527                    + (target_phys_addr_t)int128_get64(mr->size) - 1,
1528                    mr->priority,
1529                    mr->name);
1530     }
1531
1532     QTAILQ_INIT(&submr_print_queue);
1533
1534     QTAILQ_FOREACH(submr, &mr->subregions, subregions_link) {
1535         new_ml = g_new(MemoryRegionList, 1);
1536         new_ml->mr = submr;
1537         QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1538             if (new_ml->mr->addr < ml->mr->addr ||
1539                 (new_ml->mr->addr == ml->mr->addr &&
1540                  new_ml->mr->priority > ml->mr->priority)) {
1541                 QTAILQ_INSERT_BEFORE(ml, new_ml, queue);
1542                 new_ml = NULL;
1543                 break;
1544             }
1545         }
1546         if (new_ml) {
1547             QTAILQ_INSERT_TAIL(&submr_print_queue, new_ml, queue);
1548         }
1549     }
1550
1551     QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1552         mtree_print_mr(mon_printf, f, ml->mr, level + 1, base + mr->addr,
1553                        alias_print_queue);
1554     }
1555
1556     QTAILQ_FOREACH_SAFE(ml, &submr_print_queue, queue, next_ml) {
1557         g_free(ml);
1558     }
1559 }
1560
1561 void mtree_info(fprintf_function mon_printf, void *f)
1562 {
1563     MemoryRegionListHead ml_head;
1564     MemoryRegionList *ml, *ml2;
1565
1566     QTAILQ_INIT(&ml_head);
1567
1568     mon_printf(f, "memory\n");
1569     mtree_print_mr(mon_printf, f, address_space_memory.root, 0, 0, &ml_head);
1570
1571     /* print aliased regions */
1572     QTAILQ_FOREACH(ml, &ml_head, queue) {
1573         if (!ml->printed) {
1574             mon_printf(f, "%s\n", ml->mr->name);
1575             mtree_print_mr(mon_printf, f, ml->mr, 0, 0, &ml_head);
1576         }
1577     }
1578
1579     QTAILQ_FOREACH_SAFE(ml, &ml_head, queue, ml2) {
1580         g_free(ml);
1581     }
1582
1583     if (address_space_io.root &&
1584         !QTAILQ_EMPTY(&address_space_io.root->subregions)) {
1585         QTAILQ_INIT(&ml_head);
1586         mon_printf(f, "I/O\n");
1587         mtree_print_mr(mon_printf, f, address_space_io.root, 0, 0, &ml_head);
1588     }
1589 }