Be the first to like this
Device passthrough allows the user to give control of physical devices (NIC, graphic card, etc) to a virtual machine, giving it full and direct access to the device. This has several potential uses, including avoiding overhead of the device para-virtualization and being able to run unmodified guest on Xen on ARM.
Whilst PCI passthrough is already something well established on Xen, ARM support will require some fundamental changes due to architectural differences. For instance, the MSI doorbell will be translated by the IOMMU.
During this session, we will look at the state of PCI passthrough on x86. Then, we will describe the interactions of the components (PCI Root controller, interrupt controller and IOMMU) required for the use of PCI on an ARM system.
With this background, we will round out the discussion with the proposed approach for implementing PCI passthrough on ARM.