From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <jbeulich@novell.com>
Subject: RE: [PATCH 1/9] Add cpu idle pwr mgmt to xen
Date: Wed, 30 Apr 2008 11:25:06 +0100
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To: Kevin Tian <kevin.tian@intel.com>
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>>> "Tian, Kevin" <kevin.tian@intel.com> 30.04.08 11:42 >>>
>What do you mean by partly copying things? For a 32-on-64 guest,
>all pointers from guest are 32-bit and compat_handler_okay already
>ensures compat pointers validity. Only native structure may have=20
>64-bit pointer field, which is checked by common guest_handle_okay
>if from a 64bit guest, or is trusted by increasing addr limitation if
>from compat layer...

VCPUOP_register_runstate_memory_area is an example of this.

Jan