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[Xen-devel][PATCH][VT-d] Dis-allow PCI device assignment if PoD is enabl
| To: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel][PATCH][VT-d] Dis-allow PCI device assignment if PoD is enabled |
| From: | "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx> |
| Date: | Thu, 21 Jan 2010 20:28:13 +0800 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Cc: | "George.Dunlap@xxxxxxxxxxxxx" <George.Dunlap@xxxxxxxxxxxxx>, "Han, Weidong" <weidong.han@xxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "Cui, Dexuan" <dexuan.cui@xxxxxxxxx> |
| Delivery-date: | Thu, 21 Jan 2010 04:28:49 -0800 |
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| Thread-topic: | [Xen-devel][PATCH][VT-d] Dis-allow PCI device assignment if PoD is enabled |
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
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