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 static bool global_dirty_log = false;
  27
  28 static QLIST_HEAD(, MemoryListener) memory_listeners
  29     = QLIST_HEAD_INITIALIZER(memory_listeners);
  30
  31 typedef struct AddrRange AddrRange;
  32
  33 /*
  34  * Note using signed integers limits us to physical addresses at most
  35  * 63 bits wide.  They are needed for negative offsetting in aliases
  36  * (large MemoryRegion::alias_offset).
  37  */
  38 struct AddrRange {
  39     Int128 start;
  40     Int128 size;
  41 };
  42
  43 static AddrRange addrrange_make(Int128 start, Int128 size)
  44 {
  45     return (AddrRange) { start, size };
  46 }
  47
  48 static bool addrrange_equal(AddrRange r1, AddrRange r2)
  49 {
  50     return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size);
  51 }
  52
  53 static Int128 addrrange_end(AddrRange r)
  54 {
  55     return int128_add(r.start, r.size);
  56 }
  57
  58 static AddrRange addrrange_shift(AddrRange range, Int128 delta)
  59 {
  60     int128_addto(&range.start, delta);
  61     return range;
  62 }
  63
  64 static bool addrrange_contains(AddrRange range, Int128 addr)
  65 {
  66     return int128_ge(addr, range.start)
  67         && int128_lt(addr, addrrange_end(range));
  68 }
  69
  70 static bool addrrange_intersects(AddrRange r1, AddrRange r2)
  71 {
  72     return addrrange_contains(r1, r2.start)
  73         || addrrange_contains(r2, r1.start);
  74 }
  75
  76 static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2)
  77 {
  78     Int128 start = int128_max(r1.start, r2.start);
  79     Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2));
  80     return addrrange_make(start, int128_sub(end, start));
  81 }
  82
  83 struct CoalescedMemoryRange {
  84     AddrRange addr;
  85     QTAILQ_ENTRY(CoalescedMemoryRange) link;
  86 };
  87
  88 struct MemoryRegionIoeventfd {
  89     AddrRange addr;
  90     bool match_data;
  91     uint64_t data;
  92     int fd;
  93 };
  94
  95 static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a,
  96                                            MemoryRegionIoeventfd b)
  97 {
  98     if (int128_lt(a.addr.start, b.addr.start)) {
  99         return true;
 100     } else if (int128_gt(a.addr.start, b.addr.start)) {
 101         return false;
 102     } else if (int128_lt(a.addr.size, b.addr.size)) {
 103         return true;
 104     } else if (int128_gt(a.addr.size, b.addr.size)) {
 105         return false;
 106     } else if (a.match_data < b.match_data) {
 107         return true;
 108     } else  if (a.match_data > b.match_data) {
 109         return false;
 110     } else if (a.match_data) {
 111         if (a.data < b.data) {
 112             return true;
 113         } else if (a.data > b.data) {
 114             return false;
 115         }
 116     }
 117     if (a.fd < b.fd) {
 118         return true;
 119     } else if (a.fd > b.fd) {
 120         return false;
 121     }
 122     return false;
 123 }
 124
 125 static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
 126                                           MemoryRegionIoeventfd b)
 127 {
 128     return !memory_region_ioeventfd_before(a, b)
 129         && !memory_region_ioeventfd_before(b, a);
 130 }
 131
 132 typedef struct FlatRange FlatRange;
 133 typedef struct FlatView FlatView;
 134
 135 /* Range of memory in the global map.  Addresses are absolute. */
 136 struct FlatRange {
 137     MemoryRegion *mr;
 138     target_phys_addr_t offset_in_region;
 139     AddrRange addr;
 140     uint8_t dirty_log_mask;
 141     bool readable;
 142     bool readonly;
 143 };
 144
 145 /* Flattened global view of current active memory hierarchy.  Kept in sorted
 146  * order.
 147  */
 148 struct FlatView {
 149     FlatRange *ranges;
 150     unsigned nr;
 151     unsigned nr_allocated;
 152 };
 153
 154 typedef struct AddressSpace AddressSpace;
 155 typedef struct AddressSpaceOps AddressSpaceOps;
 156
 157 /* A system address space - I/O, memory, etc. */
 158 struct AddressSpace {
 159     const AddressSpaceOps *ops;
 160     MemoryRegion *root;
 161     FlatView current_map;
 162     int ioeventfd_nb;
 163     MemoryRegionIoeventfd *ioeventfds;
 164 };
 165
 166 struct AddressSpaceOps {
 167     void (*range_add)(AddressSpace *as, FlatRange *fr);
 168     void (*range_del)(AddressSpace *as, FlatRange *fr);
 169     void (*log_start)(AddressSpace *as, FlatRange *fr);
 170     void (*log_stop)(AddressSpace *as, FlatRange *fr);
 171     void (*ioeventfd_add)(AddressSpace *as, MemoryRegionIoeventfd *fd);
 172     void (*ioeventfd_del)(AddressSpace *as, MemoryRegionIoeventfd *fd);
 173 };
 174
 175 #define FOR_EACH_FLAT_RANGE(var, view)          \
 176     for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
 177
 178 static bool flatrange_equal(FlatRange *a, FlatRange *b)
 179 {
 180     return a->mr == b->mr
 181         && addrrange_equal(a->addr, b->addr)
 182         && a->offset_in_region == b->offset_in_region
 183         && a->readable == b->readable
 184         && a->readonly == b->readonly;
 185 }
 186
 187 static void flatview_init(FlatView *view)
 188 {
 189     view->ranges = NULL;
 190     view->nr = 0;
 191     view->nr_allocated = 0;
 192 }
 193
 194 /* Insert a range into a given position.  Caller is responsible for maintaining
 195  * sorting order.
 196  */
 197 static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range)
 198 {
 199     if (view->nr == view->nr_allocated) {
 200         view->nr_allocated = MAX(2 * view->nr, 10);
 201         view->ranges = g_realloc(view->ranges,
 202                                     view->nr_allocated * sizeof(*view->ranges));
 203     }
 204     memmove(view->ranges + pos + 1, view->ranges + pos,
 205             (view->nr - pos) * sizeof(FlatRange));
 206     view->ranges[pos] = *range;
 207     ++view->nr;
 208 }
 209
 210 static void flatview_destroy(FlatView *view)
 211 {
 212     g_free(view->ranges);
 213 }
 214
 215 static bool can_merge(FlatRange *r1, FlatRange *r2)
 216 {
 217     return int128_eq(addrrange_end(r1->addr), r2->addr.start)
 218         && r1->mr == r2->mr
 219         && int128_eq(int128_add(int128_make64(r1->offset_in_region),
 220                                 r1->addr.size),
 221                      int128_make64(r2->offset_in_region))
 222         && r1->dirty_log_mask == r2->dirty_log_mask
 223         && r1->readable == r2->readable
 224         && r1->readonly == r2->readonly;
 225 }
 226
 227 /* Attempt to simplify a view by merging ajacent ranges */
 228 static void flatview_simplify(FlatView *view)
 229 {
 230     unsigned i, j;
 231
 232     i = 0;
 233     while (i < view->nr) {
 234         j = i + 1;
 235         while (j < view->nr
 236                && can_merge(&view->ranges[j-1], &view->ranges[j])) {
 237             int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size);
 238             ++j;
 239         }
 240         ++i;
 241         memmove(&view->ranges[i], &view->ranges[j],
 242                 (view->nr - j) * sizeof(view->ranges[j]));
 243         view->nr -= j - i;
 244     }
 245 }
 246
 247 static void memory_region_read_accessor(void *opaque,
 248                                         target_phys_addr_t addr,
 249                                         uint64_t *value,
 250                                         unsigned size,
 251                                         unsigned shift,
 252                                         uint64_t mask)
 253 {
 254     MemoryRegion *mr = opaque;
 255     uint64_t tmp;
 256
 257     tmp = mr->ops->read(mr->opaque, addr, size);
 258     *value |= (tmp & mask) << shift;
 259 }
 260
 261 static void memory_region_write_accessor(void *opaque,
 262                                          target_phys_addr_t addr,
 263                                          uint64_t *value,
 264                                          unsigned size,
 265                                          unsigned shift,
 266                                          uint64_t mask)
 267 {
 268     MemoryRegion *mr = opaque;
 269     uint64_t tmp;
 270
 271     tmp = (*value >> shift) & mask;
 272     mr->ops->write(mr->opaque, addr, tmp, size);
 273 }
 274
 275 static void access_with_adjusted_size(target_phys_addr_t addr,
 276                                       uint64_t *value,
 277                                       unsigned size,
 278                                       unsigned access_size_min,
 279                                       unsigned access_size_max,
 280                                       void (*access)(void *opaque,
 281                                                      target_phys_addr_t addr,
 282                                                      uint64_t *value,
 283                                                      unsigned size,
 284                                                      unsigned shift,
 285                                                      uint64_t mask),
 286                                       void *opaque)
 287 {
 288     uint64_t access_mask;
 289     unsigned access_size;
 290     unsigned i;
 291
 292     if (!access_size_min) {
 293         access_size_min = 1;
 294     }
 295     if (!access_size_max) {
 296         access_size_max = 4;
 297     }
 298     access_size = MAX(MIN(size, access_size_max), access_size_min);
 299     access_mask = -1ULL >> (64 - access_size * 8);
 300     for (i = 0; i < size; i += access_size) {
 301         /* FIXME: big-endian support */
 302         access(opaque, addr + i, value, access_size, i * 8, access_mask);
 303     }
 304 }
 305
 306 static void memory_region_prepare_ram_addr(MemoryRegion *mr);
 307
 308 static void as_memory_range_add(AddressSpace *as, FlatRange *fr)
 309 {
 310     ram_addr_t phys_offset, region_offset;
 311
 312     memory_region_prepare_ram_addr(fr->mr);
 313
 314     phys_offset = fr->mr->ram_addr;
 315     region_offset = fr->offset_in_region;
 316     /* cpu_register_physical_memory_log() wants region_offset for
 317      * mmio, but prefers offseting phys_offset for RAM.  Humour it.
 318      */
 319     if ((phys_offset & ~TARGET_PAGE_MASK) <= IO_MEM_ROM) {
 320         phys_offset += region_offset;
 321         region_offset = 0;
 322     }
 323
 324     if (!fr->readable) {
 325         phys_offset &= ~TARGET_PAGE_MASK & ~IO_MEM_ROMD;
 326     }
 327
 328     if (fr->readonly) {
 329         phys_offset |= IO_MEM_ROM;
 330     }
 331
 332     cpu_register_physical_memory_log(int128_get64(fr->addr.start),
 333                                      int128_get64(fr->addr.size),
 334                                      phys_offset,
 335                                      region_offset,
 336                                      fr->dirty_log_mask);
 337 }
 338
 339 static void as_memory_range_del(AddressSpace *as, FlatRange *fr)
 340 {
 341     cpu_register_physical_memory(int128_get64(fr->addr.start),
 342                                  int128_get64(fr->addr.size),
 343                                  IO_MEM_UNASSIGNED);
 344 }
 345
 346 static void as_memory_log_start(AddressSpace *as, FlatRange *fr)
 347 {
 348 }
 349
 350 static void as_memory_log_stop(AddressSpace *as, FlatRange *fr)
 351 {
 352 }
 353
 354 static void as_memory_ioeventfd_add(AddressSpace *as, MemoryRegionIoeventfd *fd)
 355 {
 356     int r;
 357
 358     assert(fd->match_data && int128_get64(fd->addr.size) == 4);
 359
 360     r = kvm_set_ioeventfd_mmio_long(fd->fd, int128_get64(fd->addr.start),
 361                                     fd->data, true);
 362     if (r < 0) {
 363         abort();
 364     }
 365 }
 366
 367 static void as_memory_ioeventfd_del(AddressSpace *as, MemoryRegionIoeventfd *fd)
 368 {
 369     int r;
 370
 371     r = kvm_set_ioeventfd_mmio_long(fd->fd, int128_get64(fd->addr.start),
 372                                     fd->data, false);
 373     if (r < 0) {
 374         abort();
 375     }
 376 }
 377
 378 static const AddressSpaceOps address_space_ops_memory = {
 379     .range_add = as_memory_range_add,
 380     .range_del = as_memory_range_del,
 381     .log_start = as_memory_log_start,
 382     .log_stop = as_memory_log_stop,
 383     .ioeventfd_add = as_memory_ioeventfd_add,
 384     .ioeventfd_del = as_memory_ioeventfd_del,
 385 };
 386
 387 static AddressSpace address_space_memory = {
 388     .ops = &address_space_ops_memory,
 389 };
 390
 391 static const MemoryRegionPortio *find_portio(MemoryRegion *mr, uint64_t offset,
 392                                              unsigned width, bool write)
 393 {
 394     const MemoryRegionPortio *mrp;
 395
 396     for (mrp = mr->ops->old_portio; mrp->size; ++mrp) {
 397         if (offset >= mrp->offset && offset < mrp->offset + mrp->len
 398             && width == mrp->size
 399             && (write ? (bool)mrp->write : (bool)mrp->read)) {
 400             return mrp;
 401         }
 402     }
 403     return NULL;
 404 }
 405
 406 static void memory_region_iorange_read(IORange *iorange,
 407                                        uint64_t offset,
 408                                        unsigned width,
 409                                        uint64_t *data)
 410 {
 411     MemoryRegion *mr = container_of(iorange, MemoryRegion, iorange);
 412
 413     if (mr->ops->old_portio) {
 414         const MemoryRegionPortio *mrp = find_portio(mr, offset, width, false);
 415
 416         *data = ((uint64_t)1 << (width * 8)) - 1;
 417         if (mrp) {
 418             *data = mrp->read(mr->opaque, offset + mr->offset);
 419         } else if (width == 2) {
 420             mrp = find_portio(mr, offset, 1, false);
 421             assert(mrp);
 422             *data = mrp->read(mr->opaque, offset + mr->offset) |
 423                     (mrp->read(mr->opaque, offset + mr->offset + 1) << 8);
 424         }
 425         return;
 426     }
 427     *data = 0;
 428     access_with_adjusted_size(offset + mr->offset, data, width,
 429                               mr->ops->impl.min_access_size,
 430                               mr->ops->impl.max_access_size,
 431                               memory_region_read_accessor, mr);
 432 }
 433
 434 static void memory_region_iorange_write(IORange *iorange,
 435                                         uint64_t offset,
 436                                         unsigned width,
 437                                         uint64_t data)
 438 {
 439     MemoryRegion *mr = container_of(iorange, MemoryRegion, iorange);
 440
 441     if (mr->ops->old_portio) {
 442         const MemoryRegionPortio *mrp = find_portio(mr, offset, width, true);
 443
 444         if (mrp) {
 445             mrp->write(mr->opaque, offset + mr->offset, data);
 446         } else if (width == 2) {
 447             mrp = find_portio(mr, offset, 1, false);
 448             assert(mrp);
 449             mrp->write(mr->opaque, offset + mr->offset, data & 0xff);
 450             mrp->write(mr->opaque, offset + mr->offset + 1, data >> 8);
 451         }
 452         return;
 453     }
 454     access_with_adjusted_size(offset + mr->offset, &data, width,
 455                               mr->ops->impl.min_access_size,
 456                               mr->ops->impl.max_access_size,
 457                               memory_region_write_accessor, mr);
 458 }
 459
 460 static const IORangeOps memory_region_iorange_ops = {
 461     .read = memory_region_iorange_read,
 462     .write = memory_region_iorange_write,
 463 };
 464
 465 static void as_io_range_add(AddressSpace *as, FlatRange *fr)
 466 {
 467     iorange_init(&fr->mr->iorange, &memory_region_iorange_ops,
 468                  int128_get64(fr->addr.start), int128_get64(fr->addr.size));
 469     ioport_register(&fr->mr->iorange);
 470 }
 471
 472 static void as_io_range_del(AddressSpace *as, FlatRange *fr)
 473 {
 474     isa_unassign_ioport(int128_get64(fr->addr.start),
 475                         int128_get64(fr->addr.size));
 476 }
 477
 478 static void as_io_ioeventfd_add(AddressSpace *as, MemoryRegionIoeventfd *fd)
 479 {
 480     int r;
 481
 482     assert(fd->match_data && int128_get64(fd->addr.size) == 2);
 483
 484     r = kvm_set_ioeventfd_pio_word(fd->fd, int128_get64(fd->addr.start),
 485                                    fd->data, true);
 486     if (r < 0) {
 487         abort();
 488     }
 489 }
 490
 491 static void as_io_ioeventfd_del(AddressSpace *as, MemoryRegionIoeventfd *fd)
 492 {
 493     int r;
 494
 495     r = kvm_set_ioeventfd_pio_word(fd->fd, int128_get64(fd->addr.start),
 496                                    fd->data, false);
 497     if (r < 0) {
 498         abort();
 499     }
 500 }
 501
 502 static const AddressSpaceOps address_space_ops_io = {
 503     .range_add = as_io_range_add,
 504     .range_del = as_io_range_del,
 505     .ioeventfd_add = as_io_ioeventfd_add,
 506     .ioeventfd_del = as_io_ioeventfd_del,
 507 };
 508
 509 static AddressSpace address_space_io = {
 510     .ops = &address_space_ops_io,
 511 };
 512
 513 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
 514 {
 515     while (mr->parent) {
 516         mr = mr->parent;
 517     }
 518     if (mr == address_space_memory.root) {
 519         return &address_space_memory;
 520     }
 521     if (mr == address_space_io.root) {
 522         return &address_space_io;
 523     }
 524     abort();
 525 }
 526
 527 /* Render a memory region into the global view.  Ranges in @view obscure
 528  * ranges in @mr.
 529  */
 530 static void render_memory_region(FlatView *view,
 531                                  MemoryRegion *mr,
 532                                  Int128 base,
 533                                  AddrRange clip,
 534                                  bool readonly)
 535 {
 536     MemoryRegion *subregion;
 537     unsigned i;
 538     target_phys_addr_t offset_in_region;
 539     Int128 remain;
 540     Int128 now;
 541     FlatRange fr;
 542     AddrRange tmp;
 543
 544     if (!mr->enabled) {
 545         return;
 546     }
 547
 548     int128_addto(&base, int128_make64(mr->addr));
 549     readonly |= mr->readonly;
 550
 551     tmp = addrrange_make(base, mr->size);
 552
 553     if (!addrrange_intersects(tmp, clip)) {
 554         return;
 555     }
 556
 557     clip = addrrange_intersection(tmp, clip);
 558
 559     if (mr->alias) {
 560         int128_subfrom(&base, int128_make64(mr->alias->addr));
 561         int128_subfrom(&base, int128_make64(mr->alias_offset));
 562         render_memory_region(view, mr->alias, base, clip, readonly);
 563         return;
 564     }
 565
 566     /* Render subregions in priority order. */
 567     QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) {
 568         render_memory_region(view, subregion, base, clip, readonly);
 569     }
 570
 571     if (!mr->terminates) {
 572         return;
 573     }
 574
 575     offset_in_region = int128_get64(int128_sub(clip.start, base));
 576     base = clip.start;
 577     remain = clip.size;
 578
 579     /* Render the region itself into any gaps left by the current view. */
 580     for (i = 0; i < view->nr && int128_nz(remain); ++i) {
 581         if (int128_ge(base, addrrange_end(view->ranges[i].addr))) {
 582             continue;
 583         }
 584         if (int128_lt(base, view->ranges[i].addr.start)) {
 585             now = int128_min(remain,
 586                              int128_sub(view->ranges[i].addr.start, base));
 587             fr.mr = mr;
 588             fr.offset_in_region = offset_in_region;
 589             fr.addr = addrrange_make(base, now);
 590             fr.dirty_log_mask = mr->dirty_log_mask;
 591             fr.readable = mr->readable;
 592             fr.readonly = readonly;
 593             flatview_insert(view, i, &fr);
 594             ++i;
 595             int128_addto(&base, now);
 596             offset_in_region += int128_get64(now);
 597             int128_subfrom(&remain, now);
 598         }
 599         if (int128_eq(base, view->ranges[i].addr.start)) {
 600             now = int128_min(remain, view->ranges[i].addr.size);
 601             int128_addto(&base, now);
 602             offset_in_region += int128_get64(now);
 603             int128_subfrom(&remain, now);
 604         }
 605     }
 606     if (int128_nz(remain)) {
 607         fr.mr = mr;
 608         fr.offset_in_region = offset_in_region;
 609         fr.addr = addrrange_make(base, remain);
 610         fr.dirty_log_mask = mr->dirty_log_mask;
 611         fr.readable = mr->readable;
 612         fr.readonly = readonly;
 613         flatview_insert(view, i, &fr);
 614     }
 615 }
 616
 617 /* Render a memory topology into a list of disjoint absolute ranges. */
 618 static FlatView generate_memory_topology(MemoryRegion *mr)
 619 {
 620     FlatView view;
 621
 622     flatview_init(&view);
 623
 624     render_memory_region(&view, mr, int128_zero(),
 625                          addrrange_make(int128_zero(), int128_2_64()), false);
 626     flatview_simplify(&view);
 627
 628     return view;
 629 }
 630
 631 static void address_space_add_del_ioeventfds(AddressSpace *as,
 632                                              MemoryRegionIoeventfd *fds_new,
 633                                              unsigned fds_new_nb,
 634                                              MemoryRegionIoeventfd *fds_old,
 635                                              unsigned fds_old_nb)
 636 {
 637     unsigned iold, inew;
 638
 639     /* Generate a symmetric difference of the old and new fd sets, adding
 640      * and deleting as necessary.
 641      */
 642
 643     iold = inew = 0;
 644     while (iold < fds_old_nb || inew < fds_new_nb) {
 645         if (iold < fds_old_nb
 646             && (inew == fds_new_nb
 647                 || memory_region_ioeventfd_before(fds_old[iold],
 648                                                   fds_new[inew]))) {
 649             as->ops->ioeventfd_del(as, &fds_old[iold]);
 650             ++iold;
 651         } else if (inew < fds_new_nb
 652                    && (iold == fds_old_nb
 653                        || memory_region_ioeventfd_before(fds_new[inew],
 654                                                          fds_old[iold]))) {
 655             as->ops->ioeventfd_add(as, &fds_new[inew]);
 656             ++inew;
 657         } else {
 658             ++iold;
 659             ++inew;
 660         }
 661     }
 662 }
 663
 664 static void address_space_update_ioeventfds(AddressSpace *as)
 665 {
 666     FlatRange *fr;
 667     unsigned ioeventfd_nb = 0;
 668     MemoryRegionIoeventfd *ioeventfds = NULL;
 669     AddrRange tmp;
 670     unsigned i;
 671
 672     FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
 673         for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
 674             tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
 675                                   int128_sub(fr->addr.start,
 676                                              int128_make64(fr->offset_in_region)));
 677             if (addrrange_intersects(fr->addr, tmp)) {
 678                 ++ioeventfd_nb;
 679                 ioeventfds = g_realloc(ioeventfds,
 680                                           ioeventfd_nb * sizeof(*ioeventfds));
 681                 ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i];
 682                 ioeventfds[ioeventfd_nb-1].addr = tmp;
 683             }
 684         }
 685     }
 686
 687     address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb,
 688                                      as->ioeventfds, as->ioeventfd_nb);
 689
 690     g_free(as->ioeventfds);
 691     as->ioeventfds = ioeventfds;
 692     as->ioeventfd_nb = ioeventfd_nb;
 693 }
 694
 695 typedef void ListenerCallback(MemoryListener *listener,
 696                               MemoryRegionSection *mrs);
 697
 698 /* Want "void (&MemoryListener::*callback)(const MemoryRegionSection& s)" */
 699 static void memory_listener_update_region(FlatRange *fr, AddressSpace *as,
 700                                           size_t callback_offset)
 701 {
 702     MemoryRegionSection section = {
 703         .mr = fr->mr,
 704         .address_space = as->root,
 705         .offset_within_region = fr->offset_in_region,
 706         .size = int128_get64(fr->addr.size),
 707         .offset_within_address_space = int128_get64(fr->addr.start),
 708     };
 709     MemoryListener *listener;
 710
 711     QLIST_FOREACH(listener, &memory_listeners, link) {
 712         ListenerCallback *callback
 713             = *(ListenerCallback **)((void *)listener + callback_offset);
 714         callback(listener, &section);
 715     }
 716 }
 717
 718 #define MEMORY_LISTENER_UPDATE_REGION(fr, as, callback) \
 719     memory_listener_update_region(fr, as, offsetof(MemoryListener, callback))
 720
 721 static void address_space_update_topology_pass(AddressSpace *as,
 722                                                FlatView old_view,
 723                                                FlatView new_view,
 724                                                bool adding)
 725 {
 726     unsigned iold, inew;
 727     FlatRange *frold, *frnew;
 728
 729     /* Generate a symmetric difference of the old and new memory maps.
 730      * Kill ranges in the old map, and instantiate ranges in the new map.
 731      */
 732     iold = inew = 0;
 733     while (iold < old_view.nr || inew < new_view.nr) {
 734         if (iold < old_view.nr) {
 735             frold = &old_view.ranges[iold];
 736         } else {
 737             frold = NULL;
 738         }
 739         if (inew < new_view.nr) {
 740             frnew = &new_view.ranges[inew];
 741         } else {
 742             frnew = NULL;
 743         }
 744
 745         if (frold
 746             && (!frnew
 747                 || int128_lt(frold->addr.start, frnew->addr.start)
 748                 || (int128_eq(frold->addr.start, frnew->addr.start)
 749                     && !flatrange_equal(frold, frnew)))) {
 750             /* In old, but (not in new, or in new but attributes changed). */
 751
 752             if (!adding) {
 753                 MEMORY_LISTENER_UPDATE_REGION(frold, as, region_del);
 754                 as->ops->range_del(as, frold);
 755             }
 756
 757             ++iold;
 758         } else if (frold && frnew && flatrange_equal(frold, frnew)) {
 759             /* In both (logging may have changed) */
 760
 761             if (adding) {
 762                 if (frold->dirty_log_mask && !frnew->dirty_log_mask) {
 763                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, log_stop);
 764                     as->ops->log_stop(as, frnew);
 765                 } else if (frnew->dirty_log_mask && !frold->dirty_log_mask) {
 766                     as->ops->log_start(as, frnew);
 767                     MEMORY_LISTENER_UPDATE_REGION(frnew, as, log_start);
 768                 }
 769             }
 770
 771             ++iold;
 772             ++inew;
 773         } else {
 774             /* In new */
 775
 776             if (adding) {
 777                 as->ops->range_add(as, frnew);
 778                 MEMORY_LISTENER_UPDATE_REGION(frnew, as, region_add);
 779             }
 780
 781             ++inew;
 782         }
 783     }
 784 }
 785
 786
 787 static void address_space_update_topology(AddressSpace *as)
 788 {
 789     FlatView old_view = as->current_map;
 790     FlatView new_view = generate_memory_topology(as->root);
 791
 792     address_space_update_topology_pass(as, old_view, new_view, false);
 793     address_space_update_topology_pass(as, old_view, new_view, true);
 794
 795     as->current_map = new_view;
 796     flatview_destroy(&old_view);
 797     address_space_update_ioeventfds(as);
 798 }
 799
 800 static void memory_region_update_topology(MemoryRegion *mr)
 801 {
 802     if (memory_region_transaction_depth) {
 803         memory_region_update_pending |= !mr || mr->enabled;
 804         return;
 805     }
 806
 807     if (mr && !mr->enabled) {
 808         return;
 809     }
 810
 811     if (address_space_memory.root) {
 812         address_space_update_topology(&address_space_memory);
 813     }
 814     if (address_space_io.root) {
 815         address_space_update_topology(&address_space_io);
 816     }
 817
 818     memory_region_update_pending = false;
 819 }
 820
 821 void memory_region_transaction_begin(void)
 822 {
 823     ++memory_region_transaction_depth;
 824 }
 825
 826 void memory_region_transaction_commit(void)
 827 {
 828     assert(memory_region_transaction_depth);
 829     --memory_region_transaction_depth;
 830     if (!memory_region_transaction_depth && memory_region_update_pending) {
 831         memory_region_update_topology(NULL);
 832     }
 833 }
 834
 835 static void memory_region_destructor_none(MemoryRegion *mr)
 836 {
 837 }
 838
 839 static void memory_region_destructor_ram(MemoryRegion *mr)
 840 {
 841     qemu_ram_free(mr->ram_addr);
 842 }
 843
 844 static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr)
 845 {
 846     qemu_ram_free_from_ptr(mr->ram_addr);
 847 }
 848
 849 static void memory_region_destructor_iomem(MemoryRegion *mr)
 850 {
 851     cpu_unregister_io_memory(mr->ram_addr);
 852 }
 853
 854 static void memory_region_destructor_rom_device(MemoryRegion *mr)
 855 {
 856     qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK);
 857     cpu_unregister_io_memory(mr->ram_addr & ~(TARGET_PAGE_MASK | IO_MEM_ROMD));
 858 }
 859
 860 void memory_region_init(MemoryRegion *mr,
 861                         const char *name,
 862                         uint64_t size)
 863 {
 864     mr->ops = NULL;
 865     mr->parent = NULL;
 866     mr->size = int128_make64(size);
 867     if (size == UINT64_MAX) {
 868         mr->size = int128_2_64();
 869     }
 870     mr->addr = 0;
 871     mr->offset = 0;
 872     mr->enabled = true;
 873     mr->terminates = false;
 874     mr->ram = false;
 875     mr->readable = true;
 876     mr->readonly = false;
 877     mr->destructor = memory_region_destructor_none;
 878     mr->priority = 0;
 879     mr->may_overlap = false;
 880     mr->alias = NULL;
 881     QTAILQ_INIT(&mr->subregions);
 882     memset(&mr->subregions_link, 0, sizeof mr->subregions_link);
 883     QTAILQ_INIT(&mr->coalesced);
 884     mr->name = g_strdup(name);
 885     mr->dirty_log_mask = 0;
 886     mr->ioeventfd_nb = 0;
 887     mr->ioeventfds = NULL;
 888 }
 889
 890 static bool memory_region_access_valid(MemoryRegion *mr,
 891                                        target_phys_addr_t addr,
 892                                        unsigned size,
 893                                        bool is_write)
 894 {
 895     if (mr->ops->valid.accepts
 896         && !mr->ops->valid.accepts(mr->opaque, addr, size, is_write)) {
 897         return false;
 898     }
 899
 900     if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
 901         return false;
 902     }
 903
 904     /* Treat zero as compatibility all valid */
 905     if (!mr->ops->valid.max_access_size) {
 906         return true;
 907     }
 908
 909     if (size > mr->ops->valid.max_access_size
 910         || size < mr->ops->valid.min_access_size) {
 911         return false;
 912     }
 913     return true;
 914 }
 915
 916 static uint32_t memory_region_read_thunk_n(void *_mr,
 917                                            target_phys_addr_t addr,
 918                                            unsigned size)
 919 {
 920     MemoryRegion *mr = _mr;
 921     uint64_t data = 0;
 922
 923     if (!memory_region_access_valid(mr, addr, size, false)) {
 924         return -1U; /* FIXME: better signalling */
 925     }
 926
 927     if (!mr->ops->read) {
 928         return mr->ops->old_mmio.read[bitops_ffsl(size)](mr->opaque, addr);
 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_read_accessor, mr);
 936
 937     return data;
 938 }
 939
 940 static void memory_region_write_thunk_n(void *_mr,
 941                                         target_phys_addr_t addr,
 942                                         unsigned size,
 943                                         uint64_t data)
 944 {
 945     MemoryRegion *mr = _mr;
 946
 947     if (!memory_region_access_valid(mr, addr, size, true)) {
 948         return; /* FIXME: better signalling */
 949     }
 950
 951     if (!mr->ops->write) {
 952         mr->ops->old_mmio.write[bitops_ffsl(size)](mr->opaque, addr, data);
 953         return;
 954     }
 955
 956     /* FIXME: support unaligned access */
 957     access_with_adjusted_size(addr + mr->offset, &data, size,
 958                               mr->ops->impl.min_access_size,
 959                               mr->ops->impl.max_access_size,
 960                               memory_region_write_accessor, mr);
 961 }
 962
 963 static uint32_t memory_region_read_thunk_b(void *mr, target_phys_addr_t addr)
 964 {
 965     return memory_region_read_thunk_n(mr, addr, 1);
 966 }
 967
 968 static uint32_t memory_region_read_thunk_w(void *mr, target_phys_addr_t addr)
 969 {
 970     return memory_region_read_thunk_n(mr, addr, 2);
 971 }
 972
 973 static uint32_t memory_region_read_thunk_l(void *mr, target_phys_addr_t addr)
 974 {
 975     return memory_region_read_thunk_n(mr, addr, 4);
 976 }
 977
 978 static void memory_region_write_thunk_b(void *mr, target_phys_addr_t addr,
 979                                         uint32_t data)
 980 {
 981     memory_region_write_thunk_n(mr, addr, 1, data);
 982 }
 983
 984 static void memory_region_write_thunk_w(void *mr, target_phys_addr_t addr,
 985                                         uint32_t data)
 986 {
 987     memory_region_write_thunk_n(mr, addr, 2, data);
 988 }
 989
 990 static void memory_region_write_thunk_l(void *mr, target_phys_addr_t addr,
 991                                         uint32_t data)
 992 {
 993     memory_region_write_thunk_n(mr, addr, 4, data);
 994 }
 995
 996 static CPUReadMemoryFunc * const memory_region_read_thunk[] = {
 997     memory_region_read_thunk_b,
 998     memory_region_read_thunk_w,
 999     memory_region_read_thunk_l,
1000 };
1001
1002 static CPUWriteMemoryFunc * const memory_region_write_thunk[] = {
1003     memory_region_write_thunk_b,
1004     memory_region_write_thunk_w,
1005     memory_region_write_thunk_l,
1006 };
1007
1008 static void memory_region_prepare_ram_addr(MemoryRegion *mr)
1009 {
1010     if (mr->backend_registered) {
1011         return;
1012     }
1013
1014     mr->destructor = memory_region_destructor_iomem;
1015     mr->ram_addr = cpu_register_io_memory(memory_region_read_thunk,
1016                                           memory_region_write_thunk,
1017                                           mr,
1018                                           mr->ops->endianness);
1019     mr->backend_registered = true;
1020 }
1021
1022 void memory_region_init_io(MemoryRegion *mr,
1023                            const MemoryRegionOps *ops,
1024                            void *opaque,
1025                            const char *name,
1026                            uint64_t size)
1027 {
1028     memory_region_init(mr, name, size);
1029     mr->ops = ops;
1030     mr->opaque = opaque;
1031     mr->terminates = true;
1032     mr->backend_registered = false;
1033 }
1034
1035 void memory_region_init_ram(MemoryRegion *mr,
1036                             const char *name,
1037                             uint64_t size)
1038 {
1039     memory_region_init(mr, name, size);
1040     mr->ram = true;
1041     mr->terminates = true;
1042     mr->destructor = memory_region_destructor_ram;
1043     mr->ram_addr = qemu_ram_alloc(size, mr);
1044     mr->backend_registered = true;
1045 }
1046
1047 void memory_region_init_ram_ptr(MemoryRegion *mr,
1048                                 const char *name,
1049                                 uint64_t size,
1050                                 void *ptr)
1051 {
1052     memory_region_init(mr, name, size);
1053     mr->ram = true;
1054     mr->terminates = true;
1055     mr->destructor = memory_region_destructor_ram_from_ptr;
1056     mr->ram_addr = qemu_ram_alloc_from_ptr(size, ptr, mr);
1057     mr->backend_registered = true;
1058 }
1059
1060 void memory_region_init_alias(MemoryRegion *mr,
1061                               const char *name,
1062                               MemoryRegion *orig,
1063                               target_phys_addr_t offset,
1064                               uint64_t size)
1065 {
1066     memory_region_init(mr, name, size);
1067     mr->alias = orig;
1068     mr->alias_offset = offset;
1069 }
1070
1071 void memory_region_init_rom_device(MemoryRegion *mr,
1072                                    const MemoryRegionOps *ops,
1073                                    void *opaque,
1074                                    const char *name,
1075                                    uint64_t size)
1076 {
1077     memory_region_init(mr, name, size);
1078     mr->ops = ops;
1079     mr->opaque = opaque;
1080     mr->terminates = true;
1081     mr->destructor = memory_region_destructor_rom_device;
1082     mr->ram_addr = qemu_ram_alloc(size, mr);
1083     mr->ram_addr |= cpu_register_io_memory(memory_region_read_thunk,
1084                                            memory_region_write_thunk,
1085                                            mr,
1086                                            mr->ops->endianness);
1087     mr->ram_addr |= IO_MEM_ROMD;
1088     mr->backend_registered = true;
1089 }
1090
1091 void memory_region_destroy(MemoryRegion *mr)
1092 {
1093     assert(QTAILQ_EMPTY(&mr->subregions));
1094     mr->destructor(mr);
1095     memory_region_clear_coalescing(mr);
1096     g_free((char *)mr->name);
1097     g_free(mr->ioeventfds);
1098 }
1099
1100 uint64_t memory_region_size(MemoryRegion *mr)
1101 {
1102     if (int128_eq(mr->size, int128_2_64())) {
1103         return UINT64_MAX;
1104     }
1105     return int128_get64(mr->size);
1106 }
1107
1108 const char *memory_region_name(MemoryRegion *mr)
1109 {
1110     return mr->name;
1111 }
1112
1113 bool memory_region_is_ram(MemoryRegion *mr)
1114 {
1115     return mr->ram;
1116 }
1117
1118 bool memory_region_is_logging(MemoryRegion *mr)
1119 {
1120     return mr->dirty_log_mask;
1121 }
1122
1123 bool memory_region_is_rom(MemoryRegion *mr)
1124 {
1125     return mr->ram && mr->readonly;
1126 }
1127
1128 void memory_region_set_offset(MemoryRegion *mr, target_phys_addr_t offset)
1129 {
1130     mr->offset = offset;
1131 }
1132
1133 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
1134 {
1135     uint8_t mask = 1 << client;
1136
1137     mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask);
1138     memory_region_update_topology(mr);
1139 }
1140
1141 bool memory_region_get_dirty(MemoryRegion *mr, target_phys_addr_t addr,
1142                              unsigned client)
1143 {
1144     assert(mr->terminates);
1145     return cpu_physical_memory_get_dirty(mr->ram_addr + addr, 1 << client);
1146 }
1147
1148 void memory_region_set_dirty(MemoryRegion *mr, target_phys_addr_t addr)
1149 {
1150     assert(mr->terminates);
1151     return cpu_physical_memory_set_dirty(mr->ram_addr + addr);
1152 }
1153
1154 void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
1155 {
1156     FlatRange *fr;
1157
1158     FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
1159         if (fr->mr == mr) {
1160             MEMORY_LISTENER_UPDATE_REGION(fr, &address_space_memory, log_sync);
1161         }
1162     }
1163 }
1164
1165 void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
1166 {
1167     if (mr->readonly != readonly) {
1168         mr->readonly = readonly;
1169         memory_region_update_topology(mr);
1170     }
1171 }
1172
1173 void memory_region_rom_device_set_readable(MemoryRegion *mr, bool readable)
1174 {
1175     if (mr->readable != readable) {
1176         mr->readable = readable;
1177         memory_region_update_topology(mr);
1178     }
1179 }
1180
1181 void memory_region_reset_dirty(MemoryRegion *mr, target_phys_addr_t addr,
1182                                target_phys_addr_t size, unsigned client)
1183 {
1184     assert(mr->terminates);
1185     cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
1186                                     mr->ram_addr + addr + size,
1187                                     1 << client);
1188 }
1189
1190 void *memory_region_get_ram_ptr(MemoryRegion *mr)
1191 {
1192     if (mr->alias) {
1193         return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset;
1194     }
1195
1196     assert(mr->terminates);
1197
1198     return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
1199 }
1200
1201 static void memory_region_update_coalesced_range(MemoryRegion *mr)
1202 {
1203     FlatRange *fr;
1204     CoalescedMemoryRange *cmr;
1205     AddrRange tmp;
1206
1207     FOR_EACH_FLAT_RANGE(fr, &address_space_memory.current_map) {
1208         if (fr->mr == mr) {
1209             qemu_unregister_coalesced_mmio(int128_get64(fr->addr.start),
1210                                            int128_get64(fr->addr.size));
1211             QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
1212                 tmp = addrrange_shift(cmr->addr,
1213                                       int128_sub(fr->addr.start,
1214                                                  int128_make64(fr->offset_in_region)));
1215                 if (!addrrange_intersects(tmp, fr->addr)) {
1216                     continue;
1217                 }
1218                 tmp = addrrange_intersection(tmp, fr->addr);
1219                 qemu_register_coalesced_mmio(int128_get64(tmp.start),
1220                                              int128_get64(tmp.size));
1221             }
1222         }
1223     }
1224 }
1225
1226 void memory_region_set_coalescing(MemoryRegion *mr)
1227 {
1228     memory_region_clear_coalescing(mr);
1229     memory_region_add_coalescing(mr, 0, int128_get64(mr->size));
1230 }
1231
1232 void memory_region_add_coalescing(MemoryRegion *mr,
1233                                   target_phys_addr_t offset,
1234                                   uint64_t size)
1235 {
1236     CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr));
1237
1238     cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size));
1239     QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link);
1240     memory_region_update_coalesced_range(mr);
1241 }
1242
1243 void memory_region_clear_coalescing(MemoryRegion *mr)
1244 {
1245     CoalescedMemoryRange *cmr;
1246
1247     while (!QTAILQ_EMPTY(&mr->coalesced)) {
1248         cmr = QTAILQ_FIRST(&mr->coalesced);
1249         QTAILQ_REMOVE(&mr->coalesced, cmr, link);
1250         g_free(cmr);
1251     }
1252     memory_region_update_coalesced_range(mr);
1253 }
1254
1255 void memory_region_add_eventfd(MemoryRegion *mr,
1256                                target_phys_addr_t addr,
1257                                unsigned size,
1258                                bool match_data,
1259                                uint64_t data,
1260                                int fd)
1261 {
1262     MemoryRegionIoeventfd mrfd = {
1263         .addr.start = int128_make64(addr),
1264         .addr.size = int128_make64(size),
1265         .match_data = match_data,
1266         .data = data,
1267         .fd = fd,
1268     };
1269     unsigned i;
1270
1271     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1272         if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
1273             break;
1274         }
1275     }
1276     ++mr->ioeventfd_nb;
1277     mr->ioeventfds = g_realloc(mr->ioeventfds,
1278                                   sizeof(*mr->ioeventfds) * mr->ioeventfd_nb);
1279     memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i],
1280             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i));
1281     mr->ioeventfds[i] = mrfd;
1282     memory_region_update_topology(mr);
1283 }
1284
1285 void memory_region_del_eventfd(MemoryRegion *mr,
1286                                target_phys_addr_t addr,
1287                                unsigned size,
1288                                bool match_data,
1289                                uint64_t data,
1290                                int fd)
1291 {
1292     MemoryRegionIoeventfd mrfd = {
1293         .addr.start = int128_make64(addr),
1294         .addr.size = int128_make64(size),
1295         .match_data = match_data,
1296         .data = data,
1297         .fd = fd,
1298     };
1299     unsigned i;
1300
1301     for (i = 0; i < mr->ioeventfd_nb; ++i) {
1302         if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {
1303             break;
1304         }
1305     }
1306     assert(i != mr->ioeventfd_nb);
1307     memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1],
1308             sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1)));
1309     --mr->ioeventfd_nb;
1310     mr->ioeventfds = g_realloc(mr->ioeventfds,
1311                                   sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1);
1312     memory_region_update_topology(mr);
1313 }
1314
1315 static void memory_region_add_subregion_common(MemoryRegion *mr,
1316                                                target_phys_addr_t offset,
1317                                                MemoryRegion *subregion)
1318 {
1319     MemoryRegion *other;
1320
1321     assert(!subregion->parent);
1322     subregion->parent = mr;
1323     subregion->addr = offset;
1324     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1325         if (subregion->may_overlap || other->may_overlap) {
1326             continue;
1327         }
1328         if (int128_gt(int128_make64(offset),
1329                       int128_add(int128_make64(other->addr), other->size))
1330             || int128_le(int128_add(int128_make64(offset), subregion->size),
1331                          int128_make64(other->addr))) {
1332             continue;
1333         }
1334 #if 0
1335         printf("warning: subregion collision %llx/%llx (%s) "
1336                "vs %llx/%llx (%s)\n",
1337                (unsigned long long)offset,
1338                (unsigned long long)int128_get64(subregion->size),
1339                subregion->name,
1340                (unsigned long long)other->addr,
1341                (unsigned long long)int128_get64(other->size),
1342                other->name);
1343 #endif
1344     }
1345     QTAILQ_FOREACH(other, &mr->subregions, subregions_link) {
1346         if (subregion->priority >= other->priority) {
1347             QTAILQ_INSERT_BEFORE(other, subregion, subregions_link);
1348             goto done;
1349         }
1350     }
1351     QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link);
1352 done:
1353     memory_region_update_topology(mr);
1354 }
1355
1356
1357 void memory_region_add_subregion(MemoryRegion *mr,
1358                                  target_phys_addr_t offset,
1359                                  MemoryRegion *subregion)
1360 {
1361     subregion->may_overlap = false;
1362     subregion->priority = 0;
1363     memory_region_add_subregion_common(mr, offset, subregion);
1364 }
1365
1366 void memory_region_add_subregion_overlap(MemoryRegion *mr,
1367                                          target_phys_addr_t offset,
1368                                          MemoryRegion *subregion,
1369                                          unsigned priority)
1370 {
1371     subregion->may_overlap = true;
1372     subregion->priority = priority;
1373     memory_region_add_subregion_common(mr, offset, subregion);
1374 }
1375
1376 void memory_region_del_subregion(MemoryRegion *mr,
1377                                  MemoryRegion *subregion)
1378 {
1379     assert(subregion->parent == mr);
1380     subregion->parent = NULL;
1381     QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link);
1382     memory_region_update_topology(mr);
1383 }
1384
1385 void memory_region_set_enabled(MemoryRegion *mr, bool enabled)
1386 {
1387     if (enabled == mr->enabled) {
1388         return;
1389     }
1390     mr->enabled = enabled;
1391     memory_region_update_topology(NULL);
1392 }
1393
1394 void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr)
1395 {
1396     MemoryRegion *parent = mr->parent;
1397     unsigned priority = mr->priority;
1398     bool may_overlap = mr->may_overlap;
1399
1400     if (addr == mr->addr || !parent) {
1401         mr->addr = addr;
1402         return;
1403     }
1404
1405     memory_region_transaction_begin();
1406     memory_region_del_subregion(parent, mr);
1407     if (may_overlap) {
1408         memory_region_add_subregion_overlap(parent, addr, mr, priority);
1409     } else {
1410         memory_region_add_subregion(parent, addr, mr);
1411     }
1412     memory_region_transaction_commit();
1413 }
1414
1415 void memory_region_set_alias_offset(MemoryRegion *mr, target_phys_addr_t offset)
1416 {
1417     target_phys_addr_t old_offset = mr->alias_offset;
1418
1419     assert(mr->alias);
1420     mr->alias_offset = offset;
1421
1422     if (offset == old_offset || !mr->parent) {
1423         return;
1424     }
1425
1426     memory_region_update_topology(mr);
1427 }
1428
1429 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
1430 {
1431     assert(mr->backend_registered);
1432     return mr->ram_addr;
1433 }
1434
1435 static int cmp_flatrange_addr(const void *addr_, const void *fr_)
1436 {
1437     const AddrRange *addr = addr_;
1438     const FlatRange *fr = fr_;
1439
1440     if (int128_le(addrrange_end(*addr), fr->addr.start)) {
1441         return -1;
1442     } else if (int128_ge(addr->start, addrrange_end(fr->addr))) {
1443         return 1;
1444     }
1445     return 0;
1446 }
1447
1448 static FlatRange *address_space_lookup(AddressSpace *as, AddrRange addr)
1449 {
1450     return bsearch(&addr, as->current_map.ranges, as->current_map.nr,
1451                    sizeof(FlatRange), cmp_flatrange_addr);
1452 }
1453
1454 MemoryRegionSection memory_region_find(MemoryRegion *address_space,
1455                                        target_phys_addr_t addr, uint64_t size)
1456 {
1457     AddressSpace *as = memory_region_to_address_space(address_space);
1458     AddrRange range = addrrange_make(int128_make64(addr),
1459                                      int128_make64(size));
1460     FlatRange *fr = address_space_lookup(as, range);
1461     MemoryRegionSection ret = { .mr = NULL, .size = 0 };
1462
1463     if (!fr) {
1464         return ret;
1465     }
1466
1467     while (fr > as->current_map.ranges
1468            && addrrange_intersects(fr[-1].addr, range)) {
1469         --fr;
1470     }
1471
1472     ret.mr = fr->mr;
1473     range = addrrange_intersection(range, fr->addr);
1474     ret.offset_within_region = fr->offset_in_region;
1475     ret.offset_within_region += int128_get64(int128_sub(range.start,
1476                                                         fr->addr.start));
1477     ret.size = int128_get64(range.size);
1478     ret.offset_within_address_space = int128_get64(range.start);
1479     return ret;
1480 }
1481
1482 void memory_global_sync_dirty_bitmap(MemoryRegion *address_space)
1483 {
1484     AddressSpace *as = memory_region_to_address_space(address_space);
1485     FlatRange *fr;
1486
1487     FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
1488         MEMORY_LISTENER_UPDATE_REGION(fr, as, log_sync);
1489     }
1490 }
1491
1492 void memory_global_dirty_log_start(void)
1493 {
1494     MemoryListener *listener;
1495
1496     global_dirty_log = true;
1497     QLIST_FOREACH(listener, &memory_listeners, link) {
1498         listener->log_global_start(listener);
1499     }
1500 }
1501
1502 void memory_global_dirty_log_stop(void)
1503 {
1504     MemoryListener *listener;
1505
1506     global_dirty_log = false;
1507     QLIST_FOREACH(listener, &memory_listeners, link) {
1508         listener->log_global_stop(listener);
1509     }
1510 }
1511
1512 static void listener_add_address_space(MemoryListener *listener,
1513                                        AddressSpace *as)
1514 {
1515     FlatRange *fr;
1516
1517     if (global_dirty_log) {
1518         listener->log_global_start(listener);
1519     }
1520     FOR_EACH_FLAT_RANGE(fr, &as->current_map) {
1521         MemoryRegionSection section = {
1522             .mr = fr->mr,
1523             .address_space = as->root,
1524             .offset_within_region = fr->offset_in_region,
1525             .size = int128_get64(fr->addr.size),
1526             .offset_within_address_space = int128_get64(fr->addr.start),
1527         };
1528         listener->region_add(listener, &section);
1529     }
1530 }
1531
1532 void memory_listener_register(MemoryListener *listener)
1533 {
1534     QLIST_INSERT_HEAD(&memory_listeners, listener, link);
1535     listener_add_address_space(listener, &address_space_memory);
1536     listener_add_address_space(listener, &address_space_io);
1537 }
1538
1539 void memory_listener_unregister(MemoryListener *listener)
1540 {
1541     QLIST_REMOVE(listener, link);
1542 }
1543
1544 void set_system_memory_map(MemoryRegion *mr)
1545 {
1546     address_space_memory.root = mr;
1547     memory_region_update_topology(NULL);
1548 }
1549
1550 void set_system_io_map(MemoryRegion *mr)
1551 {
1552     address_space_io.root = mr;
1553     memory_region_update_topology(NULL);
1554 }
1555
1556 typedef struct MemoryRegionList MemoryRegionList;
1557
1558 struct MemoryRegionList {
1559     const MemoryRegion *mr;
1560     bool printed;
1561     QTAILQ_ENTRY(MemoryRegionList) queue;
1562 };
1563
1564 typedef QTAILQ_HEAD(queue, MemoryRegionList) MemoryRegionListHead;
1565
1566 static void mtree_print_mr(fprintf_function mon_printf, void *f,
1567                            const MemoryRegion *mr, unsigned int level,
1568                            target_phys_addr_t base,
1569                            MemoryRegionListHead *alias_print_queue)
1570 {
1571     MemoryRegionList *new_ml, *ml, *next_ml;
1572     MemoryRegionListHead submr_print_queue;
1573     const MemoryRegion *submr;
1574     unsigned int i;
1575
1576     if (!mr) {
1577         return;
1578     }
1579
1580     for (i = 0; i < level; i++) {
1581         mon_printf(f, "  ");
1582     }
1583
1584     if (mr->alias) {
1585         MemoryRegionList *ml;
1586         bool found = false;
1587
1588         /* check if the alias is already in the queue */
1589         QTAILQ_FOREACH(ml, alias_print_queue, queue) {
1590             if (ml->mr == mr->alias && !ml->printed) {
1591                 found = true;
1592             }
1593         }
1594
1595         if (!found) {
1596             ml = g_new(MemoryRegionList, 1);
1597             ml->mr = mr->alias;
1598             ml->printed = false;
1599             QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue);
1600         }
1601         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d): alias %s @%s "
1602                    TARGET_FMT_plx "-" TARGET_FMT_plx "\n",
1603                    base + mr->addr,
1604                    base + mr->addr
1605                    + (target_phys_addr_t)int128_get64(mr->size) - 1,
1606                    mr->priority,
1607                    mr->name,
1608                    mr->alias->name,
1609                    mr->alias_offset,
1610                    mr->alias_offset
1611                    + (target_phys_addr_t)int128_get64(mr->size) - 1);
1612     } else {
1613         mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d): %s\n",
1614                    base + mr->addr,
1615                    base + mr->addr
1616                    + (target_phys_addr_t)int128_get64(mr->size) - 1,
1617                    mr->priority,
1618                    mr->name);
1619     }
1620
1621     QTAILQ_INIT(&submr_print_queue);
1622
1623     QTAILQ_FOREACH(submr, &mr->subregions, subregions_link) {
1624         new_ml = g_new(MemoryRegionList, 1);
1625         new_ml->mr = submr;
1626         QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1627             if (new_ml->mr->addr < ml->mr->addr ||
1628                 (new_ml->mr->addr == ml->mr->addr &&
1629                  new_ml->mr->priority > ml->mr->priority)) {
1630                 QTAILQ_INSERT_BEFORE(ml, new_ml, queue);
1631                 new_ml = NULL;
1632                 break;
1633             }
1634         }
1635         if (new_ml) {
1636             QTAILQ_INSERT_TAIL(&submr_print_queue, new_ml, queue);
1637         }
1638     }
1639
1640     QTAILQ_FOREACH(ml, &submr_print_queue, queue) {
1641         mtree_print_mr(mon_printf, f, ml->mr, level + 1, base + mr->addr,
1642                        alias_print_queue);
1643     }
1644
1645     QTAILQ_FOREACH_SAFE(ml, &submr_print_queue, queue, next_ml) {
1646         g_free(ml);
1647     }
1648 }
1649
1650 void mtree_info(fprintf_function mon_printf, void *f)
1651 {
1652     MemoryRegionListHead ml_head;
1653     MemoryRegionList *ml, *ml2;
1654
1655     QTAILQ_INIT(&ml_head);
1656
1657     mon_printf(f, "memory\n");
1658     mtree_print_mr(mon_printf, f, address_space_memory.root, 0, 0, &ml_head);
1659
1660     /* print aliased regions */
1661     QTAILQ_FOREACH(ml, &ml_head, queue) {
1662         if (!ml->printed) {
1663             mon_printf(f, "%s\n", ml->mr->name);
1664             mtree_print_mr(mon_printf, f, ml->mr, 0, 0, &ml_head);
1665         }
1666     }
1667
1668     QTAILQ_FOREACH_SAFE(ml, &ml_head, queue, ml2) {
1669         g_free(ml);
1670     }
1671
1672     if (address_space_io.root &&
1673         !QTAILQ_EMPTY(&address_space_io.root->subregions)) {
1674         QTAILQ_INIT(&ml_head);
1675         mon_printf(f, "I/O\n");
1676         mtree_print_mr(mon_printf, f, address_space_io.root, 0, 0, &ml_head);
1677     }
1678 }