diff options
| author | mstsirkin <mstsirkin@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652> | 2014-12-22 08:56:23 +0000 |
|---|---|---|
| committer | mstsirkin <mstsirkin@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652> | 2014-12-22 08:56:23 +0000 |
| commit | 008ede54e424e49256106c201e5458551eacf238 (patch) | |
| tree | 8b429d4c103fb639bd31c1746f36cc5fe16224c6 | |
| parent | 42180b0ccf2de93537a74c39311b09333945d035 (diff) | |
ccw: two-stage indicators for legacy devices
Some legacy devices will support two-stage queue indicators and therefore
won't reject CCW_CMD_SET_IND_ADAPTER. Note this.
VIRTIO-127
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio/trunk@443 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652
| -rw-r--r-- | content.tex | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/content.tex b/content.tex index d2d9ae7..952b605 100644 --- a/content.tex +++ b/content.tex @@ -2742,8 +2742,11 @@ command reject to any subsequent CCW_CMD_SET_IND_ADAPTER command. \paragraph{Legacy Interfaces: A Note on Setting Up Indicators}\label{sec:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Setting Up Indicators / Legacy Interfaces: A Note on Setting Up Indicators} -Legacy devices will only support classic queue indicators; they will -reject CCW_CMD_SET_IND_ADAPTER as they don't know that command. +In some cases, legacy devices will only support classic queue indicators; +in that case, they will reject CCW_CMD_SET_IND_ADAPTER as they don't know that +command. Some legacy devices will support two-stage queue indicators, though, +and a driver will be able to successfully use CCW_CMD_SET_IND_ADAPTER to set +them up. \subsection{Device Operation}\label{sec:Virtio Transport Options / Virtio over channel I/O / Device Operation} |