Virtualization Software Development

Need required about using intel-vt into guests (nested)

Hi, i'm creating a hypervisor based on Intel-vt extensions, each VM must be able to have it's own hypervisor with Intel-vt (i don't have choice).

The probleme is to use a hypervisor into a VM with Intel-VT require to be in root-operation to perfectly use virtualization instructions such as VMCALL, VMREAD ... But each vm-exit will only give control to the first hypervisor.

So the sub-monitor will never be used.

How can i do that ? Is nested virtualization with Intel-VT is realy possible without modifying guest ?

Thanks a lot.

how to know what the VMM has registered for its control fields

I'm trying to find out what does the Microsoft Hypervisor register for as its control fields.

What registers do I need to be looking at it to find this? The documentaiton is unclear as to where the registers are that control the fields. It keeps saying bitmaps .. but to what.

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Finding out if "Unrestricted Guest" supported at runtime

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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