Stefan Hajnoczi wrote: > Why add a nop AIO operation instead of setting > BlockDriverState->enable_write_cache to zero? In that case no write > cache would be reported to the guest (just like cache=writethrough).
Hmm. If the guest sees write cache absent, that prevents changing the cache policy on the host later (from not flushing to flushing), which you might want to do after an OS install has finished and booted up. -- Jamie
