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Created attachment 1241655 [details]
screenshot

Description of problem:
Can't change smartcard mode from host to passthrough in virt-manager

Version-Release number of selected component (if applicable):
virt-manager-0.9.0-34.el6.x86_64
libvirt-0.10.2-62.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.501.el6.x86_64
python-virtinst-0.600.0-31.el6.noarch


How reproducible:
100%

Steps to Reproduce:
1 Prepare a guest in virt-manager and add smartcard which is host to guest
Open guest's virtual hardware detail-> add hardware -> select smartcard device and mode is host ->Finish

2.Return to  guest's virtual hardware detail, try to change smartcard mode from host to passthrough ,then will pop up error"Error changing VM configuration: XML error: passthrough mode requires a character device type attribute", details pls refer to screenshot and log

Actual results:
As above description

Expected results:
Can change smartcard mode from host to passthrough in virt-manager


Additional info:
1.Can't reproduce this problem on rhel7.3

Created attachment 1241656 [details]
virt-manager-debug.log

Thanks for the report, but I don't think this is worth fixing for RHEL6, given that:

1) there's no customer/user complaint
2) I don't think there's many people using this functionality with virt-manager, 3) you can workaround it by removing the device and using 'add hardware' to add a passthrough one
4) rhel6 is old and the virt-manager code there is old too so it will need a custom patch

FYI this works upstream, but the code is vastly different

Closing as WONTFIX but please reopen if anyone disagrees