Windows Server 2008 R2 Hyper-V also introduces a new feature named Processor Compatibility Mode for live migration. This feature was implemented to expand customers’ options when it comes to live migrating VMs across different CPU versions from the same processor manufacture (e.g. Intel-to-Intel and AMD-to-AMD). Previously, any Live or Quick Migration operation had to be conducted across hosts with identical CPUs.
Processor compatibility is disabled by default, but can be activated either via the Hyper-V Manager or System Center Virtual machine Manager 2008 R2. It is most applicable to Hyper-V’s Live Migration (new with R2), but Quick Migration or standard Save/Restore operations can also benefit from it. Lastly, processor compatibility is supported by any Hyper-V-enabled CPU which supports hardware assisted virtualization; however, it is important to note that it supports migration only across CPUs versions in the same product family (ie, Intel-to-Intel or AMD-to-AMD). Cross-vendor CPU migration is not supported mainly due to differing instruction sets implemented by different CPU vendors.
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