86 Payload  section in Message Specification
91 A single 64-bit integer
100 A vring state description
111 A vring descriptor index for split virtqueues
128 Vring descriptor indices for packed virtqueues
148 A vring address description
172 Memory region description
207 Single memory region description
218 Multiple Memory regions description
231 Log description
244 An IOTLB message
269 Virtio device config space
287 Vring area description
301 Inflight description
317 VhostUserShared
327 Device state transfer parameters