Community
cancel
Showing results for 
Search instead for 
Did you mean: 
johndoe31415
Beginner
1,216 Views

Finding out if "Unrestricted Guest" supported at runtime

Jump to solution
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
0 Kudos
1 Solution
Tracy_Camp
New Contributor I
1,216 Views
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.

View solution in original post

2 Replies
Tracy_Camp
New Contributor I
1,217 Views
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.

View solution in original post

johndoe31415
Beginner
1,216 Views
Perfect, thank you very much!
Reply