Finding out if "Unrestricted Guest" supported at runtime

Finding out if "Unrestricted Guest" supported at runtime

Ritratto di johndoe31415
johndoe31415
Dom, 03/06/2012 - 03:51

Hi there,

is there an option to find out at runtime (e.g. with means of CPUID or something else) if the "Unrestricted Guest" feature is supported on the CPU? In the developer manual I can only find which flags control the UG feature (i.e. "25.8. Unrestricted Guests" ff), but I don't see anywhere how to determine if the feature is actually supported. Historically, at which processor family was "Unrestricted Guest" introduced? Is there a easy way to tell which processors contian the feature from the timeline?

Best regards,
Joe

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Ritratto di Tracy Camp
Tracy Camp
Lun, 04/06/2012 - 06:37
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There are a series of MSRs that tell you if a given CPU supports the '1' setting of unrestricted guest and a number of other virtualization features. The specific MSR is IA32_VMX_PROCBASED_CTLS2 and I believe unrestricted guest is bit 7 in the secondary proc controls VMCS field.

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Ritratto di johndoe31415
johndoe31415
Mar, 05/06/2012 - 01:07

Perfect, thank you very much!

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