Log:
2024-01-07 10:23:56.756+0000: starting up libvirt version: 9.7.0, package: 1.fc39 (Fedora Project, 2023-09-04-13:12:57, ), qemu version: 8.1.3qemu-8.1.3-1.fc39, kernel: 6.6.9-200.fc39.x86_64, hostname: XXX
LC_ALL=C \
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin \
HOME=/var/lib/libvirt/qemu/domain-1-Whonix-Gateway \
XDG_DATA_HOME=/var/lib/libvirt/qemu/domain-1-Whonix-Gateway/.local/share \
XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain-1-Whonix-Gateway/.cache \
XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain-1-Whonix-Gateway/.config \
/usr/bin/qemu-system-x86_64 \
-name guest=Whonix-Gateway,debug-threads=on \
-S \
-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain-1-Whonix-Gateway/master-key.aes"}' \
-machine pc-i440fx-8.1,usb=off,vmport=off,dump-guest-core=off,mem-merge=off,memory-backend=pc.ram,hpet=off,acpi=on \
-accel kvm \
-cpu host,migratable=on,kvmclock=on,kvm-pv-unhalt=on,pmu=off \
-m size=1048576k \
-object '{"qom-type":"memory-backend-ram","id":"pc.ram","size":1073741824}' \
-overcommit mem-lock=off \
-smp 1,sockets=1,cores=1,threads=1 \
-uuid 45026b03-a90c-4afc-ab24-6420e0cce02f \
-device '{"driver":"vmgenid","guid":"0efde9fb-3a6a-4035-b776-d1164537f80d","id":"vmgenid0"}' \
-no-user-config \
-nodefaults \
-chardev socket,id=charmonitor,fd=33,server=on,wait=off \
-mon chardev=charmonitor,id=monitor,mode=control \
-rtc base=utc,clock=vm,driftfix=slew \
-global kvm-pit.lost_tick_policy=delay \
-no-shutdown \
-global PIIX4_PM.disable_s3=1 \
-global PIIX4_PM.disable_s4=1 \
-boot menu=off,strict=on \
-device '{"driver":"piix3-usb-uhci","id":"usb","bus":"pci.0","addr":"0x1.0x2"}' \
-device '{"driver":"virtio-serial-pci","id":"virtio-serial0","bus":"pci.0","addr":"0x5"}' \
-blockdev '{"driver":"file","filename":"/var/lib/libvirt/images/Whonix-Gateway.qcow2","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-1-format","read-only":false,"driver":"qcow2","file":"libvirt-1-storage","backing":null}' \
-device '{"driver":"virtio-blk-pci","bus":"pci.0","addr":"0x6","drive":"libvirt-1-format","id":"virtio-disk0","bootindex":1}' \
-netdev '{"type":"tap","fd":"34","id":"hostnet0"}' \
-device '{"driver":"virtio-net-pci","netdev":"hostnet0","id":"net0","mac":"52:54:00:ea:9a:bf","bus":"pci.0","addr":"0x3"}' \
-netdev '{"type":"tap","fd":"36","id":"hostnet1"}' \
-device '{"driver":"virtio-net-pci","netdev":"hostnet1","id":"net1","mac":"52:54:00:1b:e4:6a","bus":"pci.0","addr":"0x4"}' \
-chardev pty,id=charserial0 \
-device '{"driver":"isa-serial","chardev":"charserial0","id":"serial0","index":0}' \
-chardev spicevmc,id=charchannel0,name=vdagent \
-device '{"driver":"virtserialport","bus":"virtio-serial0.0","nr":1,"chardev":"charchannel0","id":"channel0","name":"com.redhat.spice.0"}' \
-audiodev '{"id":"audio1","driver":"spice"}' \
-spice port=5900,addr=127.0.0.1,disable-ticketing=on,disable-agent-file-xfer=on,seamless-migration=on \
-device '{"driver":"virtio-vga","id":"video0","max_outputs":1,"bus":"pci.0","addr":"0x2"}' \
-object '{"qom-type":"rng-random","id":"objrng0","filename":"/dev/urandom"}' \
-device '{"driver":"virtio-rng-pci","rng":"objrng0","id":"rng0","bus":"pci.0","addr":"0x7"}' \
-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
-msg timestamp=on
char device redirected to /dev/pts/2 (label charserial0)
2024-01-07T10:24:33.667007Z qemu-system-x86_64: terminating on signal 15 from pid 8496 (<unknown process>)
2024-01-07 10:24:33.867+0000: shutting down, reason=destroyed
Maybe not Fedora Silverblue related.
See also: No bootable device
Can you help @HulaHoop ?