Implement Virtio Block Driver

[bayedieng]

See #48

[bayedieng]

Hey @nuta, I began working on the virtio-blk driver and added an additional device param in the run-qemu script for the virtio-blk-pci device. I noticed that when building and running the kernel a virtio-net.pcap file is automatically generated. I would like to do the same for a vdisk file but not sure how.

[nuta]

You can use QEMU's tracing to figure out what's going on in the host's emulation:

$ make run QEMU_ARGS="--trace 'virtio_*'"

Tip: I usually use my own QEMU build to insert printf and enable hidden DEBUG macros (an example in FAT emulation) when I debug my device drivers.

[bayedieng]

Thanks, got it.