John Zulauf
Visual Computing Group, Intel Corporation
Xen Extensions to Enable Modular/3rd Party Device Emulation for HVM Domains
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Frequently a platform solution requires specific device support. No
current or proposed solution has the necessary flexibility to support
the addition of arbitrary device emulation. The current HVM device
emulation qemu-dm is monolithic, synchronous and GPL licensed. 1-1
mapping solutions only support a single domain's access to arbitrary
devices; IOMMU based solutions require instances of the desired
hardware for each domain.

Extensions to Xen are presented that define an interface for generic,
external device emulation, sharing or pass-through, which is scalable,
remote-able or even proprietary. Both PCI and non-PCI extension
mechanisms are presented with notes about required
"para-optimzations".