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iov: Introduce a new file for helpers around iovs, add iov_from_buf()
The virtio-net code uses iov_fill() which fills an iov from a linearbuffer. The virtio-serial-bus code does something similar in anopen-coded function.
Create a new iov.c file that has iov_from_buf()....
iov: Add iov_to_buf and iov_size helpers
iov_to_buf() puts the buffer contents in the iov in a linearized buffer.
iov_size() gets the length of the contents in the iov.
The iov_to_buf() function is the memcpy_to_iovec() function that wasused in virtio-ballon.c....