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I switched to spice/qxl in my VM's configuration which resulted in a failure to start the VM. It turns out that my VM's config has "machine=0.11" in it, which apparently is too old to support any virtio-serial channels at all, yielding this error when starting the VM: Error starting domain: internal error Process exited while reading console log output: char device redirected to /dev/pts/6 do_spice_init: starting 0.9.1 spice_server_add_interface: SPICE_INTERFACE_KEYBOARD spice_server_add_interface: SPICE_INTERFACE_MOUSE spice_server_add_interface: SPICE_INTERFACE_QXL red_worker_main: begin ensure_display_channel_created: create display channel ensure_cursor_channel_created: create cursor channel qemu-kvm: -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0: virtio-serial-bus: Out-of-range port id specified, max. allowed: 0 qemu-kvm: -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0: Device 'virtserialport' could not be initialized I suppose the solution for this is to also update the "machine" value (which isn't user-changable in the GUI AFAICS) when automatically creating the spice channels to ensure that the VM's config is compatible with using spice in the first place. I just changed the "machine" value to 0.13 which allowed the VM to start.
This is kind of a difficult problem. we can't automatically change the machine value since it can have many other subtle side effects, changing low level hw details that make windows require reactivation for example. granted linux doesn't really care, but then again virt-manager doesn't know what OS your guest is running. the ideal way this would work is: - qemu has a verbose capabilities reporting system, communicating what devices/features it supports possibly dependent on the 'machine' type - libvirt consumes this and forwards it through it's capabilities API - virt-manager consumes this, sees that the qemu binary supports virtio-serial + spice but not your old machine version, disables the spice option in the UI with possibly some useful tooltip unfortunately none of that exists (though its the end goal for me at least). there are various other BZs tracking that work. reassigning this bug to qemu for a better error message at least if machine type doesn't support a particular hw option.
This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component.
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Well this was never fixed, and at this point the effort of adding that fix isn't too compelling given that we are dealing with very old machine types here. So just closing as WONTFIX