Arm CCA instance creation fails

Hi, With the below virt-install options, I am trying to import a Realm VM: […] export LIBVIRT_QEMU=/home/realm/qemu-system-aarch64 virt-install --machine=virt --arch=aarch64 --name=test8 --disk path=/var/lib/libvirt/images/jammy.qcow2,format=qcow2,device=disk,bus=virtio,cache=none --memory=2048 --vcpu=8 --nographic --check all=off --features acpi=off --import --os-variant=ubuntu22.04 --qemu-commandline="-M virt,confidential-guest-support=rme0,acpi=off,gic-version=3 -cpu host -object rme-guest,id=rme0,measurement-algo=sha512" --boot kernel=Image-cca,initrd=rootfs.cpio […] However, it fails with the messages: WARNING Disk /var/lib/libvirt/images/jammy.qcow2 is already in use by other guests ['test', 'tmp1', 'jammy']. Starting install... ERROR internal error: QEMU unexpectedly closed the monitor (vm='test8'): 2024-07-22T06:40:39.290847Z qemu-system-aarch64: could not load kernel '/home/realm/Image-cca' Domain installation does not appear to have been successful. If it was, you can restart your domain by running: virsh --connect qemu:///system start test8 otherwise, please restart your installation. The libvirt packages are from Ubuntu 24.04 LTS, but QEMU is the one Linaro folk maintain. Am I using the opions wrong for kernel direct boot scenario? Thanks, Itaru.