[OASIS Issue Tracker] (VIRTIO-117) ccw: provide status accessor for driver

[ https://issues.oasis-open.org/browse/VIRTIO-117?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael S. Tsirkin updated VIRTIO-117:
--------------------------------------

    Environment: Cornelia Huck <>  (was: Cornelia Huck <> )
     Resolution: 
ccw: add CCW_CMD_READ_STATUS

ccw currently allows the driver to update the status via the
CCW_CMD_WRITE_STATUS command; however, it does not allow the driver to
retrieve the current status at the device, which is needed to properly
support DEVICE_NEEDS_RESET.

Therefore, provide a new command CCW_CMD_READ_STATUS allowing the driver
to retrieve the device status. Provide this command when revision 2 has
been negotiated.

VIRTIO-117

Signed-off-by: Cornelia Huck <>
Message-Id: <>

git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio/branches/v1.1@574 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652


> ccw: provide status accessor for driver
> ---------------------------------------
>
>                 Key: VIRTIO-117
>                 URL: https://issues.oasis-open.org/browse/VIRTIO-117
>             Project: OASIS Virtual I/O Device (VIRTIO) TC
>          Issue Type: Improvement
>    Affects Versions: virtio 1.0 csprd01, virtio 1.0 csprd02, virtio 1.0 csprd03, virtio 1.0 cs01, virtio 1.0 cs02, virtio 1.0 cs03, virtio 1.0 cs04
>         Environment: Cornelia Huck <>
>            Reporter: Cornelia Huck
>            Assignee: Cornelia Huck
>             Fix For: virtio 1.1 cs01
>
>
> ccw currently allows the driver to update the status via WRITE_STATUS; however, it does not allow the driver to retrieve the current status at the device.



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