Add "iommu=1" option in grub, due to VT-d is not enabled by default.
In addition, describes how to enable MSI/MSI-x for assigned devices.
Signed-off-by: Weidong Han <weidong.han@intel.com>
limitation note because Xen has supported MSI, and add link of VT-d
howto on xen wiki for more information about VT-d enabled systems.
Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: Edwin Zhai <edwin.zhai@intel.com>
docs/misc/vtd.txt is a vt-d how-to document that should answer
questions about how to use vt-d with latest Xen.
Signed-off-by: Allen Kay <allen.m.kay@intel.com>