Re: VT guests in kvm

[Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>]

Barry Silverman wrote:
> Does KVM support itself as a guest?
>
> IE Would the VT instruction set have to be emulated 
> completely in software, or
> could the host's VT instructions be used after 
> suitable KVM modification/validation.
>   

Nested hardware virtualization is a very interesting topic that AFAIK 
noone has yet to address.

The VT instruction set would have to be emulated of course.  It's a bit 
easier with VT I suspect b/c you can more easily trap things like 
vmwrite to ensure the guest isn't building a malicious VMCS.

It would incur some overhead in already sensitive places (since 
vmlaunch/vmresume will trap).  I think it could be done in such a way 
though that any level of nesting will have a fixed overhead.

An analysis of this would make a pretty interesting paper IMHO.

Regards,

Anthony Liguori

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http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642