Flexible Device Sharing in PCIe Clusters using Device Lending

Processing workloads may have very high IO demands, exceeding the capabilities provided by resource virtualization and requiring direct access to the physical hardware. For computers that are interconnected in PCI Express (PCIe) networks, we have previously proposed Device Lending as a solution for assigning devices to remote hosts. In this paper, we explain how we have extended our
implementation with support for the Linux Kernel-based Virtual Machine (KVM) hypervisor. Using our extended Device Lending, it becomes possible to dynamically “pass through” physical remote
devices to VM guests while still retaining the flexibility of virtualization, something that previously required extensive facilitation in
both hypervisor and device drivers in the form of paravirtualization.

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