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When blkdeviotune was first committed in 0.9.8, we had the limitation that setting one value reset all others. But bytes and iops should be relatively independent. Furthermore, setting tuning values on a live domain followed by dumpxml did not output the new settings. * src/qemu/qemu_driver.c (qemuDiskPathToAlias): Add parameter, and update callers. (qemuDomainSetBlockIoTune): Don't lose previous unrelated settings. Make live changes reflect to dumpxml output. * tools/virsh.pod (blkdeviotune): Update documentation.