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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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5
migration/migration.h
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@ -43,6 +43,7 @@
#define MIGRATION_THREAD_DST_PREEMPT "mig/dst/preempt"
struct PostcopyBlocktimeContext;
typedef struct ThreadPool ThreadPool;
#define MIGRATION_RESUME_ACK_VALUE (1)
@ -187,6 +188,10 @@ struct MigrationIncomingState {
Coroutine *colo_incoming_co;
QemuSemaphore colo_incoming_sem;
/* Optional load threads pool and its thread exit request flag */
ThreadPool *load_threads;
bool load_threads_abort;
/*
* PostcopyBlocktimeContext to keep information for postcopy
* live migration, to calculate vCPU block time