Immediate "system reset" when booting UEFI?

Hey folks, I'm running libvirt 10.1.0/qemu-system-x86-core-9.0.1-1.fc40.x86_64 on Fedora 40. I'm trying to boot an Ubuntu image in UEFI mode, like this: virt-install -r 2048 -n ubuntu.virt --os-variant ubuntu24.04 \ --disk pool=default,size=10,backing_store=mantic-server-cloudimg-amd64.img,backing_format=qcow2 \ --cloud-init root-ssh-key=$HOME/.ssh/id_ed25519.pub \ --boot uefi This results in the domain booting up and then immediately resetting: BdsDxe: loading Boot0001 "UEFI Misc Device" from PciRoot(0x0)/Pci(0x2,0x3)/Pci(0x0,0x0) BdsDxe: starting Boot0001 "UEFI Misc Device" from PciRoot(0x0)/Pci(0x2,0x3)/Pci(0x0,0x0) Reset System Domain creation completed. At this point, the machine is actually powered down and needs to be restarted manually: virsh start ubuntu.virt This works fine, and the domain boots successfully, but now the cloud-init metadata provided by the `--cloud-init` option to `virt-install` is no longer available (because this is no longer the initial, virt-install managed boot of the domain). What is causing the firmware to reset the system when it first boots? -- Lars Kellogg-Stedman <lars(a)redhat.com&gt;