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 #include "qemu/stats64.h" 36 37 /* 38 * These are the ram migration statistic counters. It is loosely 39 * based on MigrationStats. We change to Stat64 any counter that 40 * needs to be updated using atomic ops (can be accessed by more than 41 * one thread). 42 */ 43 typedef struct { 44 int64_t dirty_pages_rate; 45 Stat64 dirty_sync_count; 46 Stat64 dirty_sync_missed_zero_copy; 47 Stat64 downtime_bytes; 48 Stat64 zero_pages; 49 Stat64 multifd_bytes; 50 Stat64 normal_pages; 51 Stat64 postcopy_bytes; 52 Stat64 postcopy_requests; 53 Stat64 precopy_bytes; 54 int64_t remaining; 55 Stat64 transferred; 56 } RAMStats; 57 58 extern RAMStats ram_counters; 59 extern XBZRLECacheStats xbzrle_counters; 60 extern CompressionStats compression_counters; 61 62 bool ramblock_is_ignored(RAMBlock *block); 63 /* Should be holding either ram_list.mutex, or the RCU lock. */ 64 #define RAMBLOCK_FOREACH_NOT_IGNORED(block) \ 65 INTERNAL_RAMBLOCK_FOREACH(block) \ 66 if (ramblock_is_ignored(block)) {} else 67 68 #define RAMBLOCK_FOREACH_MIGRATABLE(block) \ 69 INTERNAL_RAMBLOCK_FOREACH(block) \ 70 if (!qemu_ram_is_migratable(block)) {} else 71 72 int xbzrle_cache_resize(uint64_t new_size, Error **errp); 73 uint64_t ram_bytes_remaining(void); 74 uint64_t ram_bytes_total(void); 75 void mig_throttle_counter_reset(void); 76 77 uint64_t ram_pagesize_summary(void); 78 int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len); 79 void acct_update_position(QEMUFile *f, size_t size, bool zero); 80 void ram_postcopy_migrated_memory_release(MigrationState *ms); 81 /* For outgoing discard bitmap */ 82 void ram_postcopy_send_discard_bitmap(MigrationState *ms); 83 /* For incoming postcopy discard */ 84 int ram_discard_range(const char *block_name, uint64_t start, size_t length); 85 int ram_postcopy_incoming_init(MigrationIncomingState *mis); 86 int ram_load_postcopy(QEMUFile *f, int channel); 87 88 void ram_handle_compressed(void *host, uint8_t ch, uint64_t size); 89 90 void ram_transferred_add(uint64_t bytes); 91 void ram_release_page(const char *rbname, uint64_t offset); 92 93 int ramblock_recv_bitmap_test(RAMBlock *rb, void *host_addr); 94 bool ramblock_recv_bitmap_test_byte_offset(RAMBlock *rb, uint64_t byte_offset); 95 void ramblock_recv_bitmap_set(RAMBlock *rb, void *host_addr); 96 void ramblock_recv_bitmap_set_range(RAMBlock *rb, void *host_addr, size_t nr); 97 int64_t ramblock_recv_bitmap_send(QEMUFile *file, 98 const char *block_name); 99 int ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *rb); 100 bool ramblock_page_is_discarded(RAMBlock *rb, ram_addr_t start); 101 void postcopy_preempt_shutdown_file(MigrationState *s); 102 void *postcopy_preempt_thread(void *opaque); 103 104 /* ram cache */ 105 int colo_init_ram_cache(void); 106 void colo_flush_ram_cache(void); 107 void colo_release_ram_cache(void); 108 void colo_incoming_start_dirty_log(void); 109 110 /* Background snapshot */ 111 bool ram_write_tracking_available(void); 112 bool ram_write_tracking_compatible(void); 113 void ram_write_tracking_prepare(void); 114 int ram_write_tracking_start(void); 115 void ram_write_tracking_stop(void); 116 117 #endif 118