A better Rogister than the Register - Adamson Rust
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CPUID masking is already implemented in Xen, called CPUID Levelling in the Xen 3.3 feature list, and thus Xen 3.3 can do that already...
Proxmox - bare metal install of system - virtualization - OpenVZ or KVM - machine clustering with live migration through KVM.


http://pve.proxmox.com/wiki/Backup_-_Restore_-_Live_Migration
They mask the cpu flag (cat /proc/cpuinfo to see them) between processors, so the VM only gets to see the "lowest common denominator" feature list.

Caught this over on the 360 virtualization blog.