diff options
Diffstat (limited to 'virtio-v1.0-wd01-part1-specification.txt')
| -rw-r--r-- | virtio-v1.0-wd01-part1-specification.txt | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/virtio-v1.0-wd01-part1-specification.txt b/virtio-v1.0-wd01-part1-specification.txt index 5aad07e..66d3bab 100644 --- a/virtio-v1.0-wd01-part1-specification.txt +++ b/virtio-v1.0-wd01-part1-specification.txt @@ -1544,6 +1544,28 @@ normal channel subsystem device discovery (usually a STORE SUBCHANNEL loop) and answers to the basic channel commands, most importantly SENSE ID. +For a virtio-ccw proxy device, SENSE ID will return the following +information: + +------------------------------------------------------ +| Bytes | Contents | +|-------|--------------------------------------------| +| 0 | reserved | 0xff | +|-------|-----------------------|--------------------| +| 1-2 | control unit type | 0x3832 | +|-------|-----------------------|--------------------| +| 3 | control unit model | <virtio device id> | +|-------|-----------------------|--------------------| +| 4-5 | device type | zeroes (unset) | +|-------|-----------------------|--------------------| +| 6 | device model | zeroes (unset) | +|-------|-----------------------|--------------------| +| 7-255 | extended SenseId data | zeroes (unset) | +------------------------------------------------------ + +A driver for virtio-ccw devices MUST check for a control unit +type of 0x3832 and MUST ignore the device type and model. + In addition to the basic channel commands, virtio-ccw defines a set of channel commands related to configuration and operation of virtio: |