memory.h

   1 /*
   2  * Physical memory management API
   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 #ifndef MEMORY_H
  15 #define MEMORY_H
  16
  17 #ifndef CONFIG_USER_ONLY
  18
  19 #include <stdint.h>
  20 #include <stdbool.h>
  21 #include "qemu-common.h"
  22 #include "cpu-common.h"
  23 #include "targphys.h"
  24 #include "qemu-queue.h"
  25 #include "iorange.h"
  26 #include "ioport.h"
  27 #include "int128.h"
  28
  29 typedef struct MemoryRegionOps MemoryRegionOps;
  30 typedef struct MemoryRegion MemoryRegion;
  31 typedef struct MemoryRegionPortio MemoryRegionPortio;
  32 typedef struct MemoryRegionMmio MemoryRegionMmio;
  33
  34 /* Must match *_DIRTY_FLAGS in cpu-all.h.  To be replaced with dynamic
  35  * registration.
  36  */
  37 #define DIRTY_MEMORY_VGA       0
  38 #define DIRTY_MEMORY_CODE      1
  39 #define DIRTY_MEMORY_MIGRATION 3
  40
  41 struct MemoryRegionMmio {
  42     CPUReadMemoryFunc *read[3];
  43     CPUWriteMemoryFunc *write[3];
  44 };
  45
  46 /*
  47  * Memory region callbacks
  48  */
  49 struct MemoryRegionOps {
  50     /* Read from the memory region. @addr is relative to @mr; @size is
  51      * in bytes. */
  52     uint64_t (*read)(void *opaque,
  53                      target_phys_addr_t addr,
  54                      unsigned size);
  55     /* Write to the memory region. @addr is relative to @mr; @size is
  56      * in bytes. */
  57     void (*write)(void *opaque,
  58                   target_phys_addr_t addr,
  59                   uint64_t data,
  60                   unsigned size);
  61
  62     enum device_endian endianness;
  63     /* Guest-visible constraints: */
  64     struct {
  65         /* If nonzero, specify bounds on access sizes beyond which a machine
  66          * check is thrown.
  67          */
  68         unsigned min_access_size;
  69         unsigned max_access_size;
  70         /* If true, unaligned accesses are supported.  Otherwise unaligned
  71          * accesses throw machine checks.
  72          */
  73          bool unaligned;
  74         /*
  75          * If present, and returns #false, the transaction is not accepted
  76          * by the device (and results in machine dependent behaviour such
  77          * as a machine check exception).
  78          */
  79         bool (*accepts)(void *opaque, target_phys_addr_t addr,
  80                         unsigned size, bool is_write);
  81     } valid;
  82     /* Internal implementation constraints: */
  83     struct {
  84         /* If nonzero, specifies the minimum size implemented.  Smaller sizes
  85          * will be rounded upwards and a partial result will be returned.
  86          */
  87         unsigned min_access_size;
  88         /* If nonzero, specifies the maximum size implemented.  Larger sizes
  89          * will be done as a series of accesses with smaller sizes.
  90          */
  91         unsigned max_access_size;
  92         /* If true, unaligned accesses are supported.  Otherwise all accesses
  93          * are converted to (possibly multiple) naturally aligned accesses.
  94          */
  95          bool unaligned;
  96     } impl;
  97
  98     /* If .read and .write are not present, old_portio may be used for
  99      * backwards compatibility with old portio registration
 100      */
 101     const MemoryRegionPortio *old_portio;
 102     /* If .read and .write are not present, old_mmio may be used for
 103      * backwards compatibility with old mmio registration
 104      */
 105     const MemoryRegionMmio old_mmio;
 106 };
 107
 108 typedef struct CoalescedMemoryRange CoalescedMemoryRange;
 109 typedef struct MemoryRegionIoeventfd MemoryRegionIoeventfd;
 110
 111 struct MemoryRegion {
 112     /* All fields are private - violators will be prosecuted */
 113     const MemoryRegionOps *ops;
 114     void *opaque;
 115     MemoryRegion *parent;
 116     Int128 size;
 117     target_phys_addr_t addr;
 118     target_phys_addr_t offset;
 119     void (*destructor)(MemoryRegion *mr);
 120     ram_addr_t ram_addr;
 121     IORange iorange;
 122     bool subpage;
 123     bool terminates;
 124     bool readable;
 125     bool ram;
 126     bool readonly; /* For RAM regions */
 127     bool enabled;
 128     bool rom_device;
 129     bool warning_printed; /* For reservations */
 130     MemoryRegion *alias;
 131     target_phys_addr_t alias_offset;
 132     unsigned priority;
 133     bool may_overlap;
 134     QTAILQ_HEAD(subregions, MemoryRegion) subregions;
 135     QTAILQ_ENTRY(MemoryRegion) subregions_link;
 136     QTAILQ_HEAD(coalesced_ranges, CoalescedMemoryRange) coalesced;
 137     const char *name;
 138     uint8_t dirty_log_mask;
 139     unsigned ioeventfd_nb;
 140     MemoryRegionIoeventfd *ioeventfds;
 141 };
 142
 143 struct MemoryRegionPortio {
 144     uint32_t offset;
 145     uint32_t len;
 146     unsigned size;
 147     IOPortReadFunc *read;
 148     IOPortWriteFunc *write;
 149 };
 150
 151 #define PORTIO_END_OF_LIST() { }
 152
 153 typedef struct MemoryRegionSection MemoryRegionSection;
 154
 155 /**
 156  * MemoryRegionSection: describes a fragment of a #MemoryRegion
 157  *
 158  * @mr: the region, or %NULL if empty
 159  * @address_space: the address space the region is mapped in
 160  * @offset_within_region: the beginning of the section, relative to @mr's start
 161  * @size: the size of the section; will not exceed @mr's boundaries
 162  * @offset_within_address_space: the address of the first byte of the section
 163  *     relative to the region's address space
 164  */
 165 struct MemoryRegionSection {
 166     MemoryRegion *mr;
 167     MemoryRegion *address_space;
 168     target_phys_addr_t offset_within_region;
 169     uint64_t size;
 170     target_phys_addr_t offset_within_address_space;
 171 };
 172
 173 typedef struct MemoryListener MemoryListener;
 174
 175 /**
 176  * MemoryListener: callbacks structure for updates to the physical memory map
 177  *
 178  * Allows a component to adjust to changes in the guest-visible memory map.
 179  * Use with memory_listener_register() and memory_listener_unregister().
 180  */
 181 struct MemoryListener {
 182     void (*region_add)(MemoryListener *listener, MemoryRegionSection *section);
 183     void (*region_del)(MemoryListener *listener, MemoryRegionSection *section);
 184     void (*log_start)(MemoryListener *listener, MemoryRegionSection *section);
 185     void (*log_stop)(MemoryListener *listener, MemoryRegionSection *section);
 186     void (*log_sync)(MemoryListener *listener, MemoryRegionSection *section);
 187     void (*log_global_start)(MemoryListener *listener);
 188     void (*log_global_stop)(MemoryListener *listener);
 189     QLIST_ENTRY(MemoryListener) link;
 190 };
 191
 192 /**
 193  * memory_region_init: Initialize a memory region
 194  *
 195  * The region typically acts as a container for other memory regions.  Use
 196  * memory_region_add_subregion() to add subregions.
 197  *
 198  * @mr: the #MemoryRegion to be initialized
 199  * @name: used for debugging; not visible to the user or ABI
 200  * @size: size of the region; any subregions beyond this size will be clipped
 201  */
 202 void memory_region_init(MemoryRegion *mr,
 203                         const char *name,
 204                         uint64_t size);
 205 /**
 206  * memory_region_init_io: Initialize an I/O memory region.
 207  *
 208  * Accesses into the region will cause the callbacks in @ops to be called.
 209  * if @size is nonzero, subregions will be clipped to @size.
 210  *
 211  * @mr: the #MemoryRegion to be initialized.
 212  * @ops: a structure containing read and write callbacks to be used when
 213  *       I/O is performed on the region.
 214  * @opaque: passed to to the read and write callbacks of the @ops structure.
 215  * @name: used for debugging; not visible to the user or ABI
 216  * @size: size of the region.
 217  */
 218 void memory_region_init_io(MemoryRegion *mr,
 219                            const MemoryRegionOps *ops,
 220                            void *opaque,
 221                            const char *name,
 222                            uint64_t size);
 223
 224 /**
 225  * memory_region_init_ram:  Initialize RAM memory region.  Accesses into the
 226  *                          region will modify memory directly.
 227  *
 228  * @mr: the #MemoryRegion to be initialized.
 229  * @name: the name of the region.
 230  * @size: size of the region.
 231  */
 232 void memory_region_init_ram(MemoryRegion *mr,
 233                             const char *name,
 234                             uint64_t size);
 235
 236 /**
 237  * memory_region_init_ram:  Initialize RAM memory region from a user-provided.
 238  *                          pointer.  Accesses into the region will modify
 239  *                          memory directly.
 240  *
 241  * @mr: the #MemoryRegion to be initialized.
 242  * @name: the name of the region.
 243  * @size: size of the region.
 244  * @ptr: memory to be mapped; must contain at least @size bytes.
 245  */
 246 void memory_region_init_ram_ptr(MemoryRegion *mr,
 247                                 const char *name,
 248                                 uint64_t size,
 249                                 void *ptr);
 250
 251 /**
 252  * memory_region_init_alias: Initialize a memory region that aliases all or a
 253  *                           part of another memory region.
 254  *
 255  * @mr: the #MemoryRegion to be initialized.
 256  * @name: used for debugging; not visible to the user or ABI
 257  * @orig: the region to be referenced; @mr will be equivalent to
 258  *        @orig between @offset and @offset + @size - 1.
 259  * @offset: start of the section in @orig to be referenced.
 260  * @size: size of the region.
 261  */
 262 void memory_region_init_alias(MemoryRegion *mr,
 263                               const char *name,
 264                               MemoryRegion *orig,
 265                               target_phys_addr_t offset,
 266                               uint64_t size);
 267
 268 /**
 269  * memory_region_init_rom_device:  Initialize a ROM memory region.  Writes are
 270  *                                 handled via callbacks.
 271  *
 272  * @mr: the #MemoryRegion to be initialized.
 273  * @ops: callbacks for write access handling.
 274  * @name: the name of the region.
 275  * @size: size of the region.
 276  */
 277 void memory_region_init_rom_device(MemoryRegion *mr,
 278                                    const MemoryRegionOps *ops,
 279                                    void *opaque,
 280                                    const char *name,
 281                                    uint64_t size);
 282
 283 /**
 284  * memory_region_init_reservation: Initialize a memory region that reserves
 285  *                                 I/O space.
 286  *
 287  * A reservation region primariy serves debugging purposes.  It claims I/O
 288  * space that is not supposed to be handled by QEMU itself.  Any access via
 289  * the memory API will cause an abort().
 290  *
 291  * @mr: the #MemoryRegion to be initialized
 292  * @name: used for debugging; not visible to the user or ABI
 293  * @size: size of the region.
 294  */
 295 void memory_region_init_reservation(MemoryRegion *mr,
 296                                     const char *name,
 297                                     uint64_t size);
 298 /**
 299  * memory_region_destroy: Destroy a memory region and reclaim all resources.
 300  *
 301  * @mr: the region to be destroyed.  May not currently be a subregion
 302  *      (see memory_region_add_subregion()) or referenced in an alias
 303  *      (see memory_region_init_alias()).
 304  */
 305 void memory_region_destroy(MemoryRegion *mr);
 306
 307 /**
 308  * memory_region_size: get a memory region's size.
 309  *
 310  * @mr: the memory region being queried.
 311  */
 312 uint64_t memory_region_size(MemoryRegion *mr);
 313
 314 /**
 315  * memory_region_is_ram: check whether a memory region is random access
 316  *
 317  * Returns %true is a memory region is random access.
 318  *
 319  * @mr: the memory region being queried
 320  */
 321 bool memory_region_is_ram(MemoryRegion *mr);
 322
 323 /**
 324  * memory_region_name: get a memory region's name
 325  *
 326  * Returns the string that was used to initialize the memory region.
 327  *
 328  * @mr: the memory region being queried
 329  */
 330 const char *memory_region_name(MemoryRegion *mr);
 331
 332 /**
 333  * memory_region_is_logging: return whether a memory region is logging writes
 334  *
 335  * Returns %true if the memory region is logging writes
 336  *
 337  * @mr: the memory region being queried
 338  */
 339 bool memory_region_is_logging(MemoryRegion *mr);
 340
 341 /**
 342  * memory_region_is_rom: check whether a memory region is ROM
 343  *
 344  * Returns %true is a memory region is read-only memory.
 345  *
 346  * @mr: the memory region being queried
 347  */
 348 bool memory_region_is_rom(MemoryRegion *mr);
 349
 350 /**
 351  * memory_region_get_ram_ptr: Get a pointer into a RAM memory region.
 352  *
 353  * Returns a host pointer to a RAM memory region (created with
 354  * memory_region_init_ram() or memory_region_init_ram_ptr()).  Use with
 355  * care.
 356  *
 357  * @mr: the memory region being queried.
 358  */
 359 void *memory_region_get_ram_ptr(MemoryRegion *mr);
 360
 361 /**
 362  * memory_region_set_offset: Sets an offset to be added to MemoryRegionOps
 363  *                           callbacks.
 364  *
 365  * This function is deprecated and should not be used in new code.
 366  */
 367 void memory_region_set_offset(MemoryRegion *mr, target_phys_addr_t offset);
 368
 369 /**
 370  * memory_region_set_log: Turn dirty logging on or off for a region.
 371  *
 372  * Turns dirty logging on or off for a specified client (display, migration).
 373  * Only meaningful for RAM regions.
 374  *
 375  * @mr: the memory region being updated.
 376  * @log: whether dirty logging is to be enabled or disabled.
 377  * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
 378  *          %DIRTY_MEMORY_VGA.
 379  */
 380 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client);
 381
 382 /**
 383  * memory_region_get_dirty: Check whether a page is dirty for a specified
 384  *                          client.
 385  *
 386  * Checks whether a page has been written to since the last
 387  * call to memory_region_reset_dirty() with the same @client.  Dirty logging
 388  * must be enabled.
 389  *
 390  * @mr: the memory region being queried.
 391  * @addr: the address (relative to the start of the region) being queried.
 392  * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
 393  *          %DIRTY_MEMORY_VGA.
 394  */
 395 bool memory_region_get_dirty(MemoryRegion *mr, target_phys_addr_t addr,
 396                              unsigned client);
 397
 398 /**
 399  * memory_region_set_dirty: Mark a page as dirty in a memory region.
 400  *
 401  * Marks a page as dirty, after it has been dirtied outside guest code.
 402  *
 403  * @mr: the memory region being queried.
 404  * @addr: the address (relative to the start of the region) being dirtied.
 405  */
 406 void memory_region_set_dirty(MemoryRegion *mr, target_phys_addr_t addr);
 407
 408 /**
 409  * memory_region_sync_dirty_bitmap: Synchronize a region's dirty bitmap with
 410  *                                  any external TLBs (e.g. kvm)
 411  *
 412  * Flushes dirty information from accelerators such as kvm and vhost-net
 413  * and makes it available to users of the memory API.
 414  *
 415  * @mr: the region being flushed.
 416  */
 417 void memory_region_sync_dirty_bitmap(MemoryRegion *mr);
 418
 419 /**
 420  * memory_region_reset_dirty: Mark a range of pages as clean, for a specified
 421  *                            client.
 422  *
 423  * Marks a range of pages as no longer dirty.
 424  *
 425  * @mr: the region being updated.
 426  * @addr: the start of the subrange being cleaned.
 427  * @size: the size of the subrange being cleaned.
 428  * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
 429  *          %DIRTY_MEMORY_VGA.
 430  */
 431 void memory_region_reset_dirty(MemoryRegion *mr, target_phys_addr_t addr,
 432                                target_phys_addr_t size, unsigned client);
 433
 434 /**
 435  * memory_region_set_readonly: Turn a memory region read-only (or read-write)
 436  *
 437  * Allows a memory region to be marked as read-only (turning it into a ROM).
 438  * only useful on RAM regions.
 439  *
 440  * @mr: the region being updated.
 441  * @readonly: whether rhe region is to be ROM or RAM.
 442  */
 443 void memory_region_set_readonly(MemoryRegion *mr, bool readonly);
 444
 445 /**
 446  * memory_region_rom_device_set_readable: enable/disable ROM readability
 447  *
 448  * Allows a ROM device (initialized with memory_region_init_rom_device() to
 449  * to be marked as readable (default) or not readable.  When it is readable,
 450  * the device is mapped to guest memory.  When not readable, reads are
 451  * forwarded to the #MemoryRegion.read function.
 452  *
 453  * @mr: the memory region to be updated
 454  * @readable: whether reads are satisified directly (%true) or via callbacks
 455  *            (%false)
 456  */
 457 void memory_region_rom_device_set_readable(MemoryRegion *mr, bool readable);
 458
 459 /**
 460  * memory_region_set_coalescing: Enable memory coalescing for the region.
 461  *
 462  * Enabled writes to a region to be queued for later processing. MMIO ->write
 463  * callbacks may be delayed until a non-coalesced MMIO is issued.
 464  * Only useful for IO regions.  Roughly similar to write-combining hardware.
 465  *
 466  * @mr: the memory region to be write coalesced
 467  */
 468 void memory_region_set_coalescing(MemoryRegion *mr);
 469
 470 /**
 471  * memory_region_add_coalescing: Enable memory coalescing for a sub-range of
 472  *                               a region.
 473  *
 474  * Like memory_region_set_coalescing(), but works on a sub-range of a region.
 475  * Multiple calls can be issued coalesced disjoint ranges.
 476  *
 477  * @mr: the memory region to be updated.
 478  * @offset: the start of the range within the region to be coalesced.
 479  * @size: the size of the subrange to be coalesced.
 480  */
 481 void memory_region_add_coalescing(MemoryRegion *mr,
 482                                   target_phys_addr_t offset,
 483                                   uint64_t size);
 484
 485 /**
 486  * memory_region_clear_coalescing: Disable MMIO coalescing for the region.
 487  *
 488  * Disables any coalescing caused by memory_region_set_coalescing() or
 489  * memory_region_add_coalescing().  Roughly equivalent to uncacheble memory
 490  * hardware.
 491  *
 492  * @mr: the memory region to be updated.
 493  */
 494 void memory_region_clear_coalescing(MemoryRegion *mr);
 495
 496 /**
 497  * memory_region_add_eventfd: Request an eventfd to be triggered when a word
 498  *                            is written to a location.
 499  *
 500  * Marks a word in an IO region (initialized with memory_region_init_io())
 501  * as a trigger for an eventfd event.  The I/O callback will not be called.
 502  * The caller must be prepared to handle failure (that is, take the required
 503  * action if the callback _is_ called).
 504  *
 505  * @mr: the memory region being updated.
 506  * @addr: the address within @mr that is to be monitored
 507  * @size: the size of the access to trigger the eventfd
 508  * @match_data: whether to match against @data, instead of just @addr
 509  * @data: the data to match against the guest write
 510  * @fd: the eventfd to be triggered when @addr, @size, and @data all match.
 511  **/
 512 void memory_region_add_eventfd(MemoryRegion *mr,
 513                                target_phys_addr_t addr,
 514                                unsigned size,
 515                                bool match_data,
 516                                uint64_t data,
 517                                int fd);
 518
 519 /**
 520  * memory_region_del_eventfd: Cancel an eventfd.
 521  *
 522  * Cancels an eventfd trigger requested by a previous
 523  * memory_region_add_eventfd() call.
 524  *
 525  * @mr: the memory region being updated.
 526  * @addr: the address within @mr that is to be monitored
 527  * @size: the size of the access to trigger the eventfd
 528  * @match_data: whether to match against @data, instead of just @addr
 529  * @data: the data to match against the guest write
 530  * @fd: the eventfd to be triggered when @addr, @size, and @data all match.
 531  */
 532 void memory_region_del_eventfd(MemoryRegion *mr,
 533                                target_phys_addr_t addr,
 534                                unsigned size,
 535                                bool match_data,
 536                                uint64_t data,
 537                                int fd);
 538 /**
 539  * memory_region_add_subregion: Add a subregion to a container.
 540  *
 541  * Adds a subregion at @offset.  The subregion may not overlap with other
 542  * subregions (except for those explicitly marked as overlapping).  A region
 543  * may only be added once as a subregion (unless removed with
 544  * memory_region_del_subregion()); use memory_region_init_alias() if you
 545  * want a region to be a subregion in multiple locations.
 546  *
 547  * @mr: the region to contain the new subregion; must be a container
 548  *      initialized with memory_region_init().
 549  * @offset: the offset relative to @mr where @subregion is added.
 550  * @subregion: the subregion to be added.
 551  */
 552 void memory_region_add_subregion(MemoryRegion *mr,
 553                                  target_phys_addr_t offset,
 554                                  MemoryRegion *subregion);
 555 /**
 556  * memory_region_add_subregion: Add a subregion to a container, with overlap.
 557  *
 558  * Adds a subregion at @offset.  The subregion may overlap with other
 559  * subregions.  Conflicts are resolved by having a higher @priority hide a
 560  * lower @priority. Subregions without priority are taken as @priority 0.
 561  * A region may only be added once as a subregion (unless removed with
 562  * memory_region_del_subregion()); use memory_region_init_alias() if you
 563  * want a region to be a subregion in multiple locations.
 564  *
 565  * @mr: the region to contain the new subregion; must be a container
 566  *      initialized with memory_region_init().
 567  * @offset: the offset relative to @mr where @subregion is added.
 568  * @subregion: the subregion to be added.
 569  * @priority: used for resolving overlaps; highest priority wins.
 570  */
 571 void memory_region_add_subregion_overlap(MemoryRegion *mr,
 572                                          target_phys_addr_t offset,
 573                                          MemoryRegion *subregion,
 574                                          unsigned priority);
 575
 576 /**
 577  * memory_region_get_ram_addr: Get the ram address associated with a memory
 578  *                             region
 579  *
 580  * DO NOT USE THIS FUNCTION.  This is a temporary workaround while the Xen
 581  * code is being reworked.
 582  */
 583 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr);
 584
 585 /**
 586  * memory_region_del_subregion: Remove a subregion.
 587  *
 588  * Removes a subregion from its container.
 589  *
 590  * @mr: the container to be updated.
 591  * @subregion: the region being removed; must be a current subregion of @mr.
 592  */
 593 void memory_region_del_subregion(MemoryRegion *mr,
 594                                  MemoryRegion *subregion);
 595
 596 /*
 597  * memory_region_set_enabled: dynamically enable or disable a region
 598  *
 599  * Enables or disables a memory region.  A disabled memory region
 600  * ignores all accesses to itself and its subregions.  It does not
 601  * obscure sibling subregions with lower priority - it simply behaves as
 602  * if it was removed from the hierarchy.
 603  *
 604  * Regions default to being enabled.
 605  *
 606  * @mr: the region to be updated
 607  * @enabled: whether to enable or disable the region
 608  */
 609 void memory_region_set_enabled(MemoryRegion *mr, bool enabled);
 610
 611 /*
 612  * memory_region_set_address: dynamically update the address of a region
 613  *
 614  * Dynamically updates the address of a region, relative to its parent.
 615  * May be used on regions are currently part of a memory hierarchy.
 616  *
 617  * @mr: the region to be updated
 618  * @addr: new address, relative to parent region
 619  */
 620 void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr);
 621
 622 /*
 623  * memory_region_set_alias_offset: dynamically update a memory alias's offset
 624  *
 625  * Dynamically updates the offset into the target region that an alias points
 626  * to, as if the fourth argument to memory_region_init_alias() has changed.
 627  *
 628  * @mr: the #MemoryRegion to be updated; should be an alias.
 629  * @offset: the new offset into the target memory region
 630  */
 631 void memory_region_set_alias_offset(MemoryRegion *mr,
 632                                     target_phys_addr_t offset);
 633
 634 /**
 635  * memory_region_find: locate a MemoryRegion in an address space
 636  *
 637  * Locates the first #MemoryRegion within an address space given by
 638  * @address_space that overlaps the range given by @addr and @size.
 639  *
 640  * Returns a #MemoryRegionSection that describes a contiguous overlap.
 641  * It will have the following characteristics:
 642  *    .@offset_within_address_space >= @addr
 643  *    .@offset_within_address_space + .@size <= @addr + @size
 644  *    .@size = 0 iff no overlap was found
 645  *    .@mr is non-%NULL iff an overlap was found
 646  *
 647  * @address_space: a top-level (i.e. parentless) region that contains
 648  *       the region to be found
 649  * @addr: start of the area within @address_space to be searched
 650  * @size: size of the area to be searched
 651  */
 652 MemoryRegionSection memory_region_find(MemoryRegion *address_space,
 653                                        target_phys_addr_t addr, uint64_t size);
 654
 655
 656 /**
 657  * memory_global_sync_dirty_bitmap: synchronize the dirty log for all memory
 658  *
 659  * Synchronizes the dirty page log for an entire address space.
 660  * @address_space: a top-level (i.e. parentless) region that contains the
 661  *       memory being synchronized
 662  */
 663 void memory_global_sync_dirty_bitmap(MemoryRegion *address_space);
 664
 665 /**
 666  * memory_region_transaction_begin: Start a transaction.
 667  *
 668  * During a transaction, changes will be accumulated and made visible
 669  * only when the transaction ends (is committed).
 670  */
 671 void memory_region_transaction_begin(void);
 672
 673 /**
 674  * memory_region_transaction_commit: Commit a transaction and make changes
 675  *                                   visible to the guest.
 676  */
 677 void memory_region_transaction_commit(void);
 678
 679 /**
 680  * memory_listener_register: register callbacks to be called when memory
 681  *                           sections are mapped or unmapped into an address
 682  *                           space
 683  *
 684  * @listener: an object containing the callbacks to be called
 685  */
 686 void memory_listener_register(MemoryListener *listener);
 687
 688 /**
 689  * memory_listener_unregister: undo the effect of memory_listener_register()
 690  *
 691  * @listener: an object containing the callbacks to be removed
 692  */
 693 void memory_listener_unregister(MemoryListener *listener);
 694
 695 /**
 696  * memory_global_dirty_log_start: begin dirty logging for all regions
 697  */
 698 void memory_global_dirty_log_start(void);
 699
 700 /**
 701  * memory_global_dirty_log_stop: begin dirty logging for all regions
 702  */
 703 void memory_global_dirty_log_stop(void);
 704
 705 void mtree_info(fprintf_function mon_printf, void *f);
 706
 707 #endif
 708
 709 #endif