Load QEMU Firmware Configuration Device in virt-manager?

Question

Is there a way to load fw_cfg file in virt-manager (v1.4.1)?

On the plain QEMU command line I can do it like so:

-fw_cfg name=opt/com.coreos/config,file=some/file.json

I cannot find equivalent option in the virt-manager.

Answer 1

I was informed in the mailing list that:

...this will never be implemented into the virt-manager GUI.

Fortunately there's a workaround, as it's possible to set this via virt-xml/virt-install.

Eg.: you have created a virtual machine in virt-manager GUI and named it VM-1.

Now you can attach fw_cfg file to your virtual machine by using virt-xml:

virt-xml VM-1 --edit --qemu-commandline="-fw_cfg name=opt/com.coreos/config,file=/full/path/to/file.json"

However note, this is just an experimental feature in libvirt, more info here.