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 Multi-Root I/O Virtualization

The purpose of this document is to specify PCI I/O virtualization and sharing technology. The specification is focused on multi-root topologies; e.g., a server blade enclosure that uses a PCI Express® Switch-based topology to connect server blades to PCI Express Devices or PCI Express-to-PCI Bridges and enable the leaf Devices to be serially or simultaneously shared by one or more System Images (SI). Unlike the Single Root IOV environment, independent SI may execute on disparate processing components such as independent server blades.

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Multi-Root I/O Virtualization and Sharing 1.0 Specification