raw-posix: Deprecate aio=threads fallback without O_DIRECT
Currently, if the user requests aio=native, but forgets to choose a cache mode that sets O_DIRECT, that request is silently ignored and raw falls back to aio=threads. Deprecate that behaviour so we can make it an error in future qemu versions. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
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