4ed49feb44
Add a new migration capability 'mapped-ram'. The core of the feature is to ensure that RAM pages are mapped directly to offsets in the resulting migration file instead of being streamed at arbitrary points. The reasons why we'd want such behavior are: - The resulting file will have a bounded size, since pages which are dirtied multiple times will always go to a fixed location in the file, rather than constantly being added to a sequential stream. This eliminates cases where a VM with, say, 1G of RAM can result in a migration file that's 10s of GBs, provided that the workload constantly redirties memory. - It paves the way to implement O_DIRECT-enabled save/restore of the migration stream as the pages are ensured to be written at aligned offsets. - It allows the usage of multifd so we can write RAM pages to the migration file in parallel. For now, enabling the capability has no effect. The next couple of patches implement the core functionality. Acked-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Fabiano Rosas <farosas@suse.de> Link: https://lore.kernel.org/r/20240229153017.2221-8-farosas@suse.de Signed-off-by: Peter Xu <peterx@redhat.com>
109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
/*
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* QEMU migration capabilities
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*
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* Copyright (c) 2012-2023 Red Hat Inc
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*
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* Authors:
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* Orit Wasserman <owasserm@redhat.com>
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* Juan Quintela <quintela@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef QEMU_MIGRATION_OPTIONS_H
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#define QEMU_MIGRATION_OPTIONS_H
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#include "hw/qdev-properties.h"
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#include "hw/qdev-properties-system.h"
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/* migration properties */
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extern Property migration_properties[];
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/* capabilities */
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bool migrate_auto_converge(void);
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bool migrate_background_snapshot(void);
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bool migrate_block(void);
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bool migrate_colo(void);
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bool migrate_compress(void);
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bool migrate_dirty_bitmaps(void);
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bool migrate_dirty_limit(void);
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bool migrate_events(void);
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bool migrate_mapped_ram(void);
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bool migrate_ignore_shared(void);
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bool migrate_late_block_activate(void);
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bool migrate_multifd(void);
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bool migrate_pause_before_switchover(void);
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bool migrate_postcopy_blocktime(void);
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bool migrate_postcopy_preempt(void);
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bool migrate_postcopy_ram(void);
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bool migrate_rdma_pin_all(void);
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bool migrate_release_ram(void);
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bool migrate_return_path(void);
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bool migrate_switchover_ack(void);
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bool migrate_validate_uuid(void);
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bool migrate_xbzrle(void);
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bool migrate_zero_blocks(void);
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bool migrate_zero_copy_send(void);
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/*
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* pseudo capabilities
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*
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* These are functions that are used in a similar way to capabilities
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* check, but they are not a capability.
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*/
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bool migrate_multifd_flush_after_each_section(void);
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bool migrate_postcopy(void);
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bool migrate_rdma(void);
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bool migrate_tls(void);
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/* capabilities helpers */
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bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp);
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bool migrate_cap_set(int cap, bool value, Error **errp);
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/* parameters */
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const BitmapMigrationNodeAliasList *migrate_block_bitmap_mapping(void);
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bool migrate_has_block_bitmap_mapping(void);
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bool migrate_block_incremental(void);
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uint32_t migrate_checkpoint_delay(void);
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int migrate_compress_level(void);
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int migrate_compress_threads(void);
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int migrate_compress_wait_thread(void);
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uint8_t migrate_cpu_throttle_increment(void);
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uint8_t migrate_cpu_throttle_initial(void);
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bool migrate_cpu_throttle_tailslow(void);
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int migrate_decompress_threads(void);
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uint64_t migrate_downtime_limit(void);
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uint8_t migrate_max_cpu_throttle(void);
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uint64_t migrate_max_bandwidth(void);
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uint64_t migrate_avail_switchover_bandwidth(void);
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uint64_t migrate_max_postcopy_bandwidth(void);
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MigMode migrate_mode(void);
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int migrate_multifd_channels(void);
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MultiFDCompression migrate_multifd_compression(void);
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int migrate_multifd_zlib_level(void);
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int migrate_multifd_zstd_level(void);
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uint8_t migrate_throttle_trigger_threshold(void);
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const char *migrate_tls_authz(void);
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const char *migrate_tls_creds(void);
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const char *migrate_tls_hostname(void);
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uint64_t migrate_xbzrle_cache_size(void);
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/* parameters setters */
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void migrate_set_block_incremental(bool value);
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/* parameters helpers */
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bool migrate_params_check(MigrationParameters *params, Error **errp);
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void migrate_params_init(MigrationParameters *params);
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void block_cleanup_parameters(void);
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#endif
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