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Resolve Issue #143: virtio-blk: add zoned block device specification

Should the TC accept changes listed in the description to resolve issue 143, for inclusion in specification version(s) "virtio-v1.3-cs01", 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:
Issue #143: virtio-blk: add zoned block device specification
Introduce support for Zoned Block Devices (ZBDs) to virtio.

The virtio protocol for block devices (virtio-blk) is not aware of ZBDs but it allows the guest to successfully scan a host-managed zoned drive provided by as a virtio-blk device. As the result, the host-managed drive appears at the virtio-blk driver as a regular drive that will operate erroneously under the most common write workloads. Host-aware ZBDs are currently usable, but their performance is not optimal because the driver can only recoginze them as non-zoned block devices.

To properly support ZBDs, the virtio-blk protocol needs to be extended to add the capabilities to convey the zone characteristics of ZBDs to the driver and to provide the support for ZBD-specific commands.

The patch linked below extends the virtio-blk section of virtio specification with the minimum set of requirements that are necessary to support ZBDs.


The patch series to implement this spec extension in Linux kernel virtio-blk driver code has been posted to linux-block mailing list -


The patch series to add ZBD support to QEMU virtio codebase by Sam Li that follow this spec are in review at the QEMU mailing list -


The TC accepts the following proposed changes to the specification:

The TC agrees to include the above change(s) in specification version(s) "virtio-v1.3-cs01", and future versions of the


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 [ ]  Yes
 [ ]  No
 [ ]  Abstain
Opening:   Monday, 28 November 2022 @ 10:30 am EST
Closing:   Monday, 5 December 2022 @ 10:30 am EST
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 7 100%
No 0 0%
Abstain 0
Eligible members who have voted: 7 of 8 88%
Eligible members who have abstained: 0 of 8 0%
Eligible members who have not voted: 1 of 8 13%

Voting Details

Voter Company VoteReference Document and/or Comment
Enrico Granata
Google Inc.
Halil Pasic
Matti Moell
OpenSynergy GmbH
Mihai Carabas
Michael S. Tsirkin
Red Hat
Stefan Hajnoczi
Red Hat
Cornelia Huck
Red Hat
Jan Kiszka
Siemens AG