Home > Hyper-V R2, Virtualization > Tech Ed: Windows Server 2008 R2 Hyper-V News!

Tech Ed: Windows Server 2008 R2 Hyper-V News!

Today Tech Ed in Los Angeles has announced some great news for all virtualizations fans.


The most amazing part is Processor Compatibility


With Hyper-V R2, we include a new Processor Compatibility feature. Processor compatibility allows you to move a virtual machine up and down multiple processor generations from the same vendor. Here’s how it works.

When a Virtual Machine (VM) is started on a host, the hypervisor exposes the set of supported processor features available on the underlying hardware to the VM. This set of processor features are called guest visible processor features and are available to the VM until the VM is restarted.


When a VM is started with processor compatibility mode enabled, Hyper-V normalizes the processor feature set and only exposes guest visible processor features that are available on all Hyper-V enabled processors of the same processor architecture, i.e. AMD or Intel.  This allows the VM to be migrated to any hardware platform of the same processor architecture. Processor features are “hidden” by the hypervisor by intercepting a VM’s CPUID instruction and clearing the returned bits corresponding to the hidden features.


Just so we’re clear: this still means AMD<->AMD and Intel<->Intel. It does not mean you can Live Migrate between different processor vendors AMD<->Intel or vice versa.


Check more there

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