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 /* 37 * RAM_SAVE_FLAG_ZERO used to be named RAM_SAVE_FLAG_COMPRESS, it 38 * worked for pages that were filled with the same char. We switched 39 * it to only search for the zero value. And to avoid confusion with 40 * RAM_SAVE_FLAG_COMPRESS_PAGE just rename it. 41 * 42 * RAM_SAVE_FLAG_FULL (0x01) was obsoleted in 2009. 43 * 44 * RAM_SAVE_FLAG_COMPRESS_PAGE (0x100) was removed in QEMU 9.1. 45 * 46 * RAM_SAVE_FLAG_HOOK is only used in RDMA. Whenever this is found in the 47 * data stream, the flags will be passed to rdma functions in the 48 * incoming-migration side. 49 * 50 * We can't use any flag that is bigger than 0x200, because the flags are 51 * always assumed to be encoded in a ramblock address offset, which is 52 * multiple of PAGE_SIZE. Here it means QEMU supports migration with any 53 * architecture that has PAGE_SIZE>=1K (0x400). 54 */ 55 #define RAM_SAVE_FLAG_ZERO 0x002 56 #define RAM_SAVE_FLAG_MEM_SIZE 0x004 57 #define RAM_SAVE_FLAG_PAGE 0x008 58 #define RAM_SAVE_FLAG_EOS 0x010 59 #define RAM_SAVE_FLAG_CONTINUE 0x020 60 #define RAM_SAVE_FLAG_XBZRLE 0x040 61 #define RAM_SAVE_FLAG_HOOK 0x080 62 #define RAM_SAVE_FLAG_MULTIFD_FLUSH 0x200 63 64 extern XBZRLECacheStats xbzrle_counters; 65 66 /* Should be holding either ram_list.mutex, or the RCU lock. */ 67 #define RAMBLOCK_FOREACH_NOT_IGNORED(block) \ 68 INTERNAL_RAMBLOCK_FOREACH(block) \ 69 if (migrate_ram_is_ignored(block)) {} else 70 71 #define RAMBLOCK_FOREACH_MIGRATABLE(block) \ 72 INTERNAL_RAMBLOCK_FOREACH(block) \ 73 if (!qemu_ram_is_migratable(block)) {} else 74 75 void ram_mig_init(void); 76 int xbzrle_cache_resize(uint64_t new_size, Error **errp); 77 uint64_t ram_bytes_remaining(void); 78 uint64_t ram_bytes_total(void); 79 void mig_throttle_counter_reset(void); 80 81 uint64_t ram_pagesize_summary(void); 82 int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len, 83 Error **errp); 84 void ram_postcopy_migrated_memory_release(MigrationState *ms); 85 /* For outgoing discard bitmap */ 86 void ram_postcopy_send_discard_bitmap(MigrationState *ms); 87 /* For incoming postcopy discard */ 88 int ram_discard_range(const char *block_name, uint64_t start, size_t length); 89 int ram_postcopy_incoming_init(MigrationIncomingState *mis); 90 int ram_load_postcopy(QEMUFile *f, int channel); 91 92 void ram_handle_zero(void *host, uint64_t size); 93 94 void ram_transferred_add(uint64_t bytes); 95 void ram_release_page(const char *rbname, uint64_t offset); 96 97 int ramblock_recv_bitmap_test(RAMBlock *rb, void *host_addr); 98 bool ramblock_recv_bitmap_test_byte_offset(RAMBlock *rb, uint64_t byte_offset); 99 void ramblock_recv_bitmap_set(RAMBlock *rb, void *host_addr); 100 void ramblock_recv_bitmap_set_range(RAMBlock *rb, void *host_addr, size_t nr); 101 void ramblock_recv_bitmap_set_offset(RAMBlock *rb, uint64_t byte_offset); 102 int64_t ramblock_recv_bitmap_send(QEMUFile *file, 103 const char *block_name); 104 bool ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *rb, Error **errp); 105 bool ramblock_page_is_discarded(RAMBlock *rb, ram_addr_t start); 106 void postcopy_preempt_shutdown_file(MigrationState *s); 107 void *postcopy_preempt_thread(void *opaque); 108 void ramblock_set_file_bmap_atomic(RAMBlock *block, ram_addr_t offset, 109 bool set); 110 111 /* ram cache */ 112 int colo_init_ram_cache(void); 113 void colo_flush_ram_cache(void); 114 void colo_release_ram_cache(void); 115 void colo_incoming_start_dirty_log(void); 116 void colo_record_bitmap(RAMBlock *block, ram_addr_t *normal, uint32_t pages); 117 118 /* Background snapshot */ 119 bool ram_write_tracking_available(void); 120 bool ram_write_tracking_compatible(void); 121 void ram_write_tracking_prepare(void); 122 int ram_write_tracking_start(void); 123 void ram_write_tracking_stop(void); 124 125 #endif 126