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migration: Add thread pool of optional load threads

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Some drivers might want to make use of auxiliary helper threads during VM
state loading, for example to make sure that their blocking (sync) I/O
operations don't block the rest of the migration process.

Add a migration core managed thread pool to facilitate this use case.

The migration core will wait for these threads to finish before
(re)starting the VM at destination.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Link: https://lore.kernel.org/qemu-devel/b09fd70369b6159c75847e69f235cb908b02570c.1741124640.git.maciej.szmigiero@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Maciej S. Szmigiero 2025-03-04 23:03:36 +01:00 • committed by Cédric Le Goater
parent 18eb55546a
commit b1937fd1eb
6 changed files with 105 additions and 4 deletions
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3
include/migration/misc.h
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@ -45,9 +45,12 @@ bool migrate_ram_is_ignored(RAMBlock *block);
/* migration/block.c */
AnnounceParameters *migrate_announce_params(void);
/* migration/savevm.c */
void dump_vmstate_json_to_file(FILE *out_fp);
void qemu_loadvm_start_load_thread(MigrationLoadThread function,
void *opaque);
/* migration/migration.c */
void migration_object_init(void);