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...se there was only one format so it was hard to imagine what an independent API would look like. Now that there's an alternative in form of the packed ring, it's easier to see the issues, and fixing them is perhaps the cleanest way to add support for more formats. This patchset does this by indtroducing two new structures: vhost_buf to represent a buffer and vhost_desc to represent a descriptor. Descriptors aren't normally of interest to devices but do occationally get exposed e.g. for logging. Perhaps surprisingly, the higher level API actually makes things a bit easier for callers, as well...