(Apparently I managed to screw up sending that, twice. Long weekend.)
Please consider adding the option of setting the "io" attribute when attaching disks to guests. Under Red Hat (unsure if this is true under vanilla libvirt), virt-install and virt-manager both default to explicitly setting "io='native'" in the disk "driver" tag. virsh, however, does not and also does not provide an option to specify that setting at all. As a result, disks use a different IO mechanism (the default, "threads") when attached post-setup using virsh. Adding this option allows users to keep disk performance consistent for disks attached at install, and those attached afterward.
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