To work around this issue, disable Kernel DMA Protection in BIOS. It's a known implementation issue with Kernel DMA Protection. This issue occurs when legacy peripheral component interconnect (PCI) devices installed in an external chassis attempt Direct Memory Access. Xen VGA passthrough requires IOMMU (Intel VT-d. This means you can give HVM guest full and direct control of the graphics adapter, making it possible to have high performance full 3D and video acceleration in a virtual machine. Xen 4.0.0 is the first version to support VGA graphics adapter passthrough to Xen HVM (fully virtualized) guests.Most versions of Windows can use direct memory access (DMA) for higher performance on IDE hard disks and optical drives (i.e., CD or DVD). Them for the host disks containing VMware virtual disk files can improve VMware disk performance in particular, especially when VMware is making heavy use of the disk.
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