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Keir Fraser
39b4fc5972
Imagine a PCIe switch, which doesn't support ACS (Access Control Services), has 2 downstream ports: A and B, according to PCIe spec, the PCIe switch should directly route the transaction that is from A and to a device under B -- the Root Complex and IOMMU engine are bypassed -- this doesn't work at all in the case of hvm guest and can even incur potential security issue, so we should not allow such kind of device assignment. If all the intermediate PCIe swiches between a device and Root Complex support and enable ACS, we can safely asssign the device to guest. Cc: Allen Kay <allen.m.kay@intel.com> Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>
The file test.py here is from the Zope project, and is Copyright (c) 2001, 2002 Zope Corporation and Contributors. This file is released under the Zope Public License, version 2.0, a copy of which is in the file ZPL-2.0.