Xen devel - May 2009 - [patch] Unrestricted guest support in VMX

Keir,
  A new VMX feature "Unrestricted Guest" feature is added in the VMX
specification. You can look at the latest Intel processor manual for
details of the feature here:

 http://www.intel.com/products/processor/manuals

    It allows fully virtualized guests to run real mode and unpaged mode
code natively in the VMX mode when EPT is turned on. With the
unrestricted guest there is no need to emulate the guest real mode code
in the vm86 container or in the emulator. Also the guest big real mode
code works like native. 

  The attached patch enhances Xen to use the unrestricted guest feature
if available on the processor. It also adds a new xen parameter to
disable the unrestricted guest feature at the boot time. 

Signed-Off-By: Nitin A Kamble <nitin.a.kamble@intel.com>

Thanks & Regards,
Nitin


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