On 5 July 2016 at 16:20, Tom Hanson <thomas.han...@linaro.org> wrote: > So, in the original minimal command line above (#3) is the transport/bus > missing? Or is mmio implied? Or?
The virt board creates a collection of virtio-mmio transports, so if you create just a backend on the command line (via "-device virtio-scsi-device") it will be plugged into a virtio-bus on a virtio-mmio transport. You almost certainly didn't want to do this -- virtio-mmio is only there for legacy reasons [it predates pci support in the 'virt' board and the device-tree-driven kernel and for a time it was the only way to do virtio]. You want to use virtio-pci, which is more flexible and has more features (so either use -device virtio-scsi-pci, or use -device virtio-scsi-device with -device virtio-pci and suitable id/bus options to explicitly wire them together). thanks -- PMM
