Description of problem:

When adding a SPICE display in the virt-manager UI, if the user disables automatic port allocation, then they are forced to enter a TLS port. This causes QEMU VMs to fail to run if TLS is not configured in qemu.conf. Thus, if TLS is not configured, then there is no way for the user to choose an explicit SPICE port through the UI.

Version-Release number of selected component (if applicable):

0.9.3

How reproducible:

100%

Steps to Reproduce:
1. On a system without TLS configured in QEMU, open virt-manager.
2. Open the Details for a working QEMU VM.
3. Add Hardware -> Graphics -> Spice server.
4. Disable automatic port allocation.
5. Choose a non-TLS port.
6. Attempt to remove the suggested TLS port number. Observe that the UI won't let you.
7. Click Finish.
8. Try to run the VM.

Actual results:

The user is forced to choose a TLS port and the VM fails to start, saying error "unsupported configuration: spice TLS port set in XML configuration, but TLS is disabled in qemu.conf".

Expected results:

The user should be able to set an explicit non-TLS port without having to set a TLS port, e.g. by specifying the TLS port as 0 or empty.

Additional info:

On Ubuntu 12.10, package version 0.9.3-1ubuntu2.

Workaround:

Hand-modify the XML to remove the tlsPort attribute.