virtio-pci transport support #2
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Support mapping PCI by BDF to ioreq server via Xen DM calls, which shall be used by virtio-pci transport code. Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Initial introduction of Virtio PCI transport protocol support. Fundamentals are covered: it can present itself to ioreq server, provide PCI config space with basic configuration of virtio block device, handshake with frontend driver, map single MMIO BAR and operate split virtqueue. Corner and special cases not implemented yet and mostly are stubs. Only modern virtio-pci interface supported. Benchmarks show similar performance of virtio-mmio transport. Most of files and code imported from upstream kvmtool project, either directly or with substantial modifications. Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
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A draft PR for initial virtio-pci transport backend support.
CLI inderface of virtio_disk not changed, as well as default behaviour. Only a bunch of code added, so that preliminary comments could be addressed. Patches to actually use this code and integrate it with Xen interface are yet to be presented.