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