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Some virtio implementations may forward the virtio requests directly to the underlying hw. The hw may have some restrictions in how many and how big the requests can be. Therefore, the corresponding virtio device will announce this limitations with the SIZE_MAX & SEG_MAX feature. Add support for those features. Split an io request into multiple virtio requests if more than seg_max segments would be used. Also split a single buffer request into multiple segments if the buffer is bigger then size_max. Signed-off-by: Christian Pötzsch <christian.poetzsch@kernkonzept.com> Signed-off-by: Adam Lackorzynski <adam@l4re.org>