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

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

Okay, it's fair to say that any changes we make need careful checking of all
existing compat shims then. :-) This is all a bit orthogonal to the issues
in the Cx patchset.

 -- Keir

On 30/4/08 11:25, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

>>>> 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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