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Subject: [OASIS Issue Tracker] (VIRTIO-132) ccw: handling of more than 64 virtqueues

    [ https://issues.oasis-open.org/browse/VIRTIO-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=65551#comment-65551 ] 

Michael S. Tsirkin commented on VIRTIO-132:

BALLOT CREATED AT URL: https://www.oasis-open.org/apps/org/workgroup/virtio/ballot.php?id=3048

> ccw: handling of more than 64 virtqueues
> ----------------------------------------
>                 Key: VIRTIO-132
>                 URL: https://issues.oasis-open.org/browse/VIRTIO-132
>             Project: OASIS Virtual I/O Device (VIRTIO) TC
>          Issue Type: Bug
>    Affects Versions: virtio 1.0 cs01, virtio 1.0 cs02
>         Environment: Cornelia Huck <cornelia.huck@de.ibm.com>
>            Reporter: Cornelia Huck
>            Assignee: Cornelia Huck
>             Fix For: virtio 1.1 cs01
> For virtio-ccw devices using classic queue indicators, we cannot handle devices with more than 64 queues as the indicator value is a 64 bit integer and we would not be able to notify for the higher number virtqueues. The driver needs to use two-stage indicators if a device has more than 64 virtqueues.

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