[Xen-devel][PATCH][VT-d] Dis-allow PCI device assignment if PoD is enabled

["Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>]

It seems that currently we don't have any code to handle
the coexistence of VT-d and PoD. VT-d engine needs to set up
the entire page table for the domain. However if PoD is enabled,
un-populated memory is marked as populate_on_demand, and
VT-d engine won't set up page tables for them. Therefore any
DMA towards those memory may cause DMA fault.
        So for safety concern, its better to dis-allow PCI device
assignment if PoD is enabled.

Best Regards, 
-- Dongxiao

Attachment: pod_disable_dev_assign.patch
Description: pod_disable_dev_assign.patch

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