migration/ram.h

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  * Copyright (c) 2011-2015 Red Hat Inc
   6  *
   7  * Authors:
   8  *  Juan Quintela <quintela@redhat.com>
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  23  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  26  * THE SOFTWARE.
  27  */
  28
  29 #ifndef QEMU_MIGRATION_RAM_H
  30 #define QEMU_MIGRATION_RAM_H
  31
  32 #include "qapi/qapi-types-migration.h"
  33 #include "exec/cpu-common.h"
  34 #include "io/channel.h"
  35
  36 extern MigrationStats ram_counters;
  37 extern XBZRLECacheStats xbzrle_counters;
  38 extern CompressionStats compression_counters;
  39
  40 bool ramblock_is_ignored(RAMBlock *block);
  41 /* Should be holding either ram_list.mutex, or the RCU lock. */
  42 #define RAMBLOCK_FOREACH_NOT_IGNORED(block)            \
  43     INTERNAL_RAMBLOCK_FOREACH(block)                   \
  44         if (ramblock_is_ignored(block)) {} else
  45
  46 #define RAMBLOCK_FOREACH_MIGRATABLE(block)             \
  47     INTERNAL_RAMBLOCK_FOREACH(block)                   \
  48         if (!qemu_ram_is_migratable(block)) {} else
  49
  50 int xbzrle_cache_resize(uint64_t new_size, Error **errp);
  51 uint64_t ram_bytes_remaining(void);
  52 uint64_t ram_bytes_total(void);
  53 void mig_throttle_counter_reset(void);
  54
  55 uint64_t ram_pagesize_summary(void);
  56 int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len);
  57 void acct_update_position(QEMUFile *f, size_t size, bool zero);
  58 void ram_postcopy_migrated_memory_release(MigrationState *ms);
  59 /* For outgoing discard bitmap */
  60 void ram_postcopy_send_discard_bitmap(MigrationState *ms);
  61 /* For incoming postcopy discard */
  62 int ram_discard_range(const char *block_name, uint64_t start, size_t length);
  63 int ram_postcopy_incoming_init(MigrationIncomingState *mis);
  64 int ram_load_postcopy(QEMUFile *f);
  65
  66 void ram_handle_compressed(void *host, uint8_t ch, uint64_t size);
  67
  68 int ramblock_recv_bitmap_test(RAMBlock *rb, void *host_addr);
  69 bool ramblock_recv_bitmap_test_byte_offset(RAMBlock *rb, uint64_t byte_offset);
  70 void ramblock_recv_bitmap_set(RAMBlock *rb, void *host_addr);
  71 void ramblock_recv_bitmap_set_range(RAMBlock *rb, void *host_addr, size_t nr);
  72 int64_t ramblock_recv_bitmap_send(QEMUFile *file,
  73                                   const char *block_name);
  74 int ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *rb);
  75 bool ramblock_page_is_discarded(RAMBlock *rb, ram_addr_t start);
  76
  77 /* ram cache */
  78 int colo_init_ram_cache(void);
  79 void colo_flush_ram_cache(void);
  80 void colo_release_ram_cache(void);
  81 void colo_incoming_start_dirty_log(void);
  82
  83 /* Background snapshot */
  84 bool ram_write_tracking_available(void);
  85 bool ram_write_tracking_compatible(void);
  86 void ram_write_tracking_prepare(void);
  87 int ram_write_tracking_start(void);
  88 void ram_write_tracking_stop(void);
  89
  90 #endif