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Resolve VIRTIO-137: used len field requirements not documented clearly

Should the TC accept changes listed in the description to resolve issue VIRTIO-137, for inclusion in specification version(s) "virtio 1.0 cs03", and future versions of the specification?

Please vote Yes if you agree with all of the following.
If you disagree, please vote No.
If you don't have an opinion, please vote Abstain.

I move that:
The TC agrees to resolve the following specification issue:
VIRTIO-137: used len field requirements not documented clearly
When debugging qemu (which gets this wrong), I noted that the used ring's len field is only documented as follows:

field{len} the total of bytes written into the buffer.

Followed by a (presumably non-normative) note:
... is extremely useful for drivers using untrusted buffers: if you do not know exactly how much has been written by the device, you usually have to zero the buffer to ensure no data leakage occurs.

There is thus an implication that 'len' indicates the amount which was definitely overwritten by the device, but it should be clearly spelled out (such as what happens in the error case where the device may not know how much was actually overwritten).


The TC accepts the following proposed changes to the specification:

The TC agrees to include the above change(s) in specification version(s) "virtio 1.0 cs03", and future versions of the


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the Virtio TC has adopted a standing rule to conduct business only by
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close of the second ballot missed.


 [ ]  Yes
 [ ]  No
 [ ]  Abstain
Opening:   Wednesday, 25 March 2015 @ 11:45 am EDT
Closing:   Wednesday, 1 April 2015 @ 11:45 am EDT
Group:   OASIS Virtual I/O Device (VIRTIO) TC
Ballot has closed.

Referenced Items
Name Type Date Action

Voting Details

Voting Summary

Options with highest number of votes are bold

Option # Votes % of Total
Yes 8 100%
No 0 0%
Abstain 0
Eligible members who have voted: 8 of 10 80%
Eligible members who have abstained: 0 of 10 0%
Eligible members who have not voted: 2 of 10 20%

Voting Details

Voter Company VoteReference Document and/or Comment
Pawel Moll
ARM Limited
Richard Sohn
Paul Mundt
Huawei Technologies Co., Ltd.
Rusty Russell
Cornelia Huck
Bryan Venteicher
Daniel Kiper
James Bottomley
Parallels IP Holdings GmbH
Amit Shah
Red Hat
Michael Tsirkin
Red Hat