Re: [Xen-devel] VMM detection

["Wu Bingzheng" <wubingzheng@xxxxxxx>]

> It would be impossible to hide virtualisation from a PV guest kernel of
> course, and very hard to hide it from a PV guest application also.
> 
> -- Keir

So do you mean that in HVM guest, the SGDT will get the GDT of guest, but not Xen?

It lists 17 instructions in Pentium instruction set, which is virtualization sensitive
and unprivileged, including SGDT, at paper named
Analysis of the IntelPentium's Ability to Support aSecure Virtual Machine Monitor
<http://www.usenix.org/events/sec00/full_papers/robin/robin_html/index.html>.
Using these instructions, we can detect VMM on a PV guest.

I want to know if we can use these instructions to detect VMM on a HVM guest.

Thanks,
Wu

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