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virtio cleanup #5

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virtio cleanup #5

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xiw
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@xiw xiw commented Sep 27, 2019

Minor cleanup to make the code consistent with the virtio spec and other files.

- Make struct/constant names consistent with the VIRTIO spec (e.g.,
  using virtq_* rather than VRing*).

- Use struct virt_avail rather than raw u16 pointers to improve
  readability.

- Move NUM out of kernel/virtio.h, as other virtio drivers (e.g.,
  virtio-net) may need different sizes.
This makes it consistent with other files.
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