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migration: simplify blockers

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Modify migrate_add_blocker and migrate_del_blocker to take an Error **
reason.  This allows migration to own the Error object, so that if
an error occurs in migrate_add_blocker, migration code can free the Error
and clear the client handle, simplifying client code.  It also simplifies
the migrate_del_blocker call site.

In addition, this is a pre-requisite for a proposed future patch that would
add a mode argument to migration requests to support live update, and
maintain a list of blockers for each mode.  A blocker may apply to a single
mode or to multiple modes, and passing Error** will allow one Error object
to be registered for multiple modes.

No functional change.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Tested-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <1697634216-84215-1-git-send-email-steven.sistare@oracle.com>
This commit is contained in:
Steve Sistare 2023-10-18 06:03:36 -07:00 • committed by Juan Quintela
parent 04131e0009
commit c8a7fc5179
33 changed files with 92 additions and 150 deletions
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10
hw/vfio/common.c
View file

@ -129,11 +129,7 @@ int vfio_block_multiple_devices_migration(VFIODevice *vbasedev, Error **errp)
error_setg(&multiple_devices_migration_blocker,
"Multiple VFIO devices migration is supported only if all of "
"them support P2P migration");
ret = migrate_add_blocker(multiple_devices_migration_blocker, errp);
if (ret < 0) {
error_free(multiple_devices_migration_blocker);
multiple_devices_migration_blocker = NULL;
}
ret = migrate_add_blocker(&multiple_devices_migration_blocker, errp);
return ret;
}
@ -145,9 +141,7 @@ void vfio_unblock_multiple_devices_migration(void)
return;
}
migrate_del_blocker(multiple_devices_migration_blocker);
error_free(multiple_devices_migration_blocker);
multiple_devices_migration_blocker = NULL;
migrate_del_blocker(&multiple_devices_migration_blocker);
}
bool vfio_viommu_preset(VFIODevice *vbasedev)