Comment 2 for bug 1456819

Please refer to

https://bugzilla.redhat.com/show_bug.cgi?id=1185253

especially note (2) under "Additional info" in Comment #0.

"Hyper-V extensions + UEFI guest firmware + Win7 guest + guest is multi-VCPU" is not a supported configuration, even in Microsoft's own stack.

Virt-manager has been modified to avoid such a configuration (see comment #10).