Re: [Xen-devel] [PATCH 1/9] Add cpu idle pwr mgmt to xen

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 30.04.08 12:00 >>>
>Yes, I don't think we do partial copying anywhere right now. If we did, we
>could apply guest_handle_okay() checks explicitly before removing the
>addr-space limitation.

XENMEM_set_memory_map is one example where we do (valid here
because the E820 layout is identical for 32- and 64-bits).

>On the other hand, I don't think we have any hypercall right now where 4kB
>is likely to be too little space, and where the hypercall cannot be
>sub-divided into smaller chunks by the compat shim.

XENMEM_exchange and GNTTABOP_setup_table are examples for this.

Jan


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