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604b4749c5
Firstly, we're going to use the multifd flag soon in multifd code, so ram.c isn't gonna work. Secondly, we have a separate RDMA flag dangling around, which is definitely not obvious. There's one comment that helps, but not too much. Put all RAM save flags altogether, so nothing will get overlooked. Add a section explain why we can't use bits over 0x200. Remove RAM_SAVE_FLAG_FULL as it's already not used in QEMU, as the comment explained. Reviewed-by: Fabiano Rosas <farosas@suse.de> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20241206224755.1108686-4-peterx@redhat.com> Signed-off-by: Fabiano Rosas <farosas@suse.de>
125 lines
5.1 KiB
C
125 lines
5.1 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2011-2015 Red Hat Inc
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*
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* Authors:
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* Juan Quintela <quintela@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef QEMU_MIGRATION_RAM_H
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#define QEMU_MIGRATION_RAM_H
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#include "qapi/qapi-types-migration.h"
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#include "exec/cpu-common.h"
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#include "io/channel.h"
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/*
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* RAM_SAVE_FLAG_ZERO used to be named RAM_SAVE_FLAG_COMPRESS, it
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* worked for pages that were filled with the same char. We switched
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* it to only search for the zero value. And to avoid confusion with
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* RAM_SAVE_FLAG_COMPRESS_PAGE just rename it.
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*
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* RAM_SAVE_FLAG_FULL (0x01) was obsoleted in 2009.
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*
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* RAM_SAVE_FLAG_COMPRESS_PAGE (0x100) was removed in QEMU 9.1.
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*
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* RAM_SAVE_FLAG_HOOK is only used in RDMA. Whenever this is found in the
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* data stream, the flags will be passed to rdma functions in the
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* incoming-migration side.
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*
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* We can't use any flag that is bigger than 0x200, because the flags are
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* always assumed to be encoded in a ramblock address offset, which is
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* multiple of PAGE_SIZE. Here it means QEMU supports migration with any
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* architecture that has PAGE_SIZE>=1K (0x400).
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*/
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#define RAM_SAVE_FLAG_ZERO 0x002
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#define RAM_SAVE_FLAG_MEM_SIZE 0x004
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#define RAM_SAVE_FLAG_PAGE 0x008
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#define RAM_SAVE_FLAG_EOS 0x010
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#define RAM_SAVE_FLAG_CONTINUE 0x020
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#define RAM_SAVE_FLAG_XBZRLE 0x040
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#define RAM_SAVE_FLAG_HOOK 0x080
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#define RAM_SAVE_FLAG_MULTIFD_FLUSH 0x200
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extern XBZRLECacheStats xbzrle_counters;
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/* Should be holding either ram_list.mutex, or the RCU lock. */
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#define RAMBLOCK_FOREACH_NOT_IGNORED(block) \
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INTERNAL_RAMBLOCK_FOREACH(block) \
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if (migrate_ram_is_ignored(block)) {} else
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#define RAMBLOCK_FOREACH_MIGRATABLE(block) \
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INTERNAL_RAMBLOCK_FOREACH(block) \
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if (!qemu_ram_is_migratable(block)) {} else
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void ram_mig_init(void);
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int xbzrle_cache_resize(uint64_t new_size, Error **errp);
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uint64_t ram_bytes_remaining(void);
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uint64_t ram_bytes_total(void);
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void mig_throttle_counter_reset(void);
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uint64_t ram_pagesize_summary(void);
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int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len,
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Error **errp);
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void ram_postcopy_migrated_memory_release(MigrationState *ms);
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/* For outgoing discard bitmap */
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void ram_postcopy_send_discard_bitmap(MigrationState *ms);
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/* For incoming postcopy discard */
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int ram_discard_range(const char *block_name, uint64_t start, size_t length);
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int ram_postcopy_incoming_init(MigrationIncomingState *mis);
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int ram_load_postcopy(QEMUFile *f, int channel);
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void ram_handle_zero(void *host, uint64_t size);
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void ram_transferred_add(uint64_t bytes);
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void ram_release_page(const char *rbname, uint64_t offset);
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int ramblock_recv_bitmap_test(RAMBlock *rb, void *host_addr);
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bool ramblock_recv_bitmap_test_byte_offset(RAMBlock *rb, uint64_t byte_offset);
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void ramblock_recv_bitmap_set(RAMBlock *rb, void *host_addr);
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void ramblock_recv_bitmap_set_range(RAMBlock *rb, void *host_addr, size_t nr);
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void ramblock_recv_bitmap_set_offset(RAMBlock *rb, uint64_t byte_offset);
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int64_t ramblock_recv_bitmap_send(QEMUFile *file,
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const char *block_name);
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bool ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *rb, Error **errp);
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bool ramblock_page_is_discarded(RAMBlock *rb, ram_addr_t start);
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void postcopy_preempt_shutdown_file(MigrationState *s);
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void *postcopy_preempt_thread(void *opaque);
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void ramblock_set_file_bmap_atomic(RAMBlock *block, ram_addr_t offset,
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bool set);
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/* ram cache */
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int colo_init_ram_cache(void);
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void colo_flush_ram_cache(void);
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void colo_release_ram_cache(void);
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void colo_incoming_start_dirty_log(void);
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void colo_record_bitmap(RAMBlock *block, ram_addr_t *normal, uint32_t pages);
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/* Background snapshot */
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bool ram_write_tracking_available(void);
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bool ram_write_tracking_compatible(void);
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void ram_write_tracking_prepare(void);
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int ram_write_tracking_start(void);
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void ram_write_tracking_stop(void);
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#endif
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