block: mark AioContext as recursive
AioContext can be accessed recursively, in fact that's what we do with aio_poll. Marking the GSource as recursive avoids that GLib blocks it and unblocks it around every call to aio_dispatch, which is a pretty expensive operation. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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