Rusty Russell wrote:
Example block driver using virtio.
The block driver uses outbufs with sg[0] being the request information
(struct virtio_blk_outhdr) with the type, sector and inbuf id. For a
write, the rest of the sg will contain the data to be written.
The first segment of the inbuf is a result code (struct
virtio_blk_inhdr). For a read, the rest of the sg points to the input
buffer.
TODO:
1) Ordered tag support.
Implementing a do_request function has quite a few disadvantages over
hooking into q->make_request_fn. This way, we have the device plug
(latency), request merging, and I/O scheduling inside the guest.
It seems preferable to do that in the host, especially when requests
of multiple guests end up on the same physical media (shared access,
or partitioned).
_______________________________________________
Virtualization mailing list
Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linux-foundation.org/mailman/listinfo/virtualization
