RE: [Xen-devel] [RFC][PATCH] 0/9 Populate-on-demand memory

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Han, Weidong 
>Sent: Thursday, December 25, 2008 1:43 PM
>>> 
>>> At any rate, until we have that worked out, we should probably add
>>> some "seatbelt" code to make sure that people don't use PoD for a
>>> VT-d enabled domain.  I know absolutely nothing about the VT-d code;
>>> could you either write a patch to do this check, or give me an idea
>>> of the simplest thing to check?
>> 
>> Weidong works on VT-d and could give comments on exact point
>> to check.
>> 
>
>You can simply check "iommu_enabled" to know whether IOMMU 
>including VT-d and AMD IOMMU is used or not.
>

Weidong, does iommu_enabled indicate IOMMU h/w availability?
Then you'll have this nice feature disabled on most new platform
with IOMMU shipped. :-) Here a domain-based check is required,
i.e. PoD is only appliable when target domain is not passthroughed
with any device.

Thanks,
Kevin
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