Fedora 29 distro/install media will support arm32+UEFI: https://fedoraproject.org/wiki/Changes/uEFIforARMv7 This will track adding support to virt-manager for F29
I think all the bits are upstream now: b623ece2ba6736cd5b8ea2401ae9dd8504df391e eb0f4a612fe4c12f498ed8a80e5665d368b5f76c cab540792f4fc5ad0270d68d41b54a8fbeea5a7b
We will want this for libvirt too: https://www.redhat.com/archives/libvir-list/2018-August/msg00419.html
This update of blivet/anaconda is needed: https://bodhi.fedoraproject.org/updates/FEDORA-2018-85853d46b5 Plus a lorax build with this PR: https://github.com/weldr/lorax/pull/456/
virt-manager-1.6.0-1.3.git3bc7ff24c.fc29 has been submitted as an update to Fedora 29. https://bodhi.fedoraproject.org/updates/FEDORA-2018-91f23723ee
virt-manager-1.6.0-1.3.git3bc7ff24c.fc29 has been pushed to the Fedora 29 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-91f23723ee
virt-manager-1.6.0-1.3.git3bc7ff24c.fc29 has been pushed to the Fedora 29 stable repository. If problems still persist, please make note of it in this bug report.