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Subject: [PATCH 2/3] ccw: no classic indicators for > 64 virtqueues


If classic indicators are setup, the device can only notify the
driver for the first 64 virtqueues. To avoid problems, simply
disallow classic indicators for devices with more than 64 queues.

VIRTIO-132

Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
 content.tex | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/content.tex b/content.tex
index 657b9cd..4abd4eb 100644
--- a/content.tex
+++ b/content.tex
@@ -2792,6 +2792,11 @@ If the driver has already set up two-staged queue indicators via the
 CCW_CMD_SET_IND_ADAPTER command, the device MUST post a unit check
 with command reject to any subsequent CCW_CMD_SET_IND command.
 
+If the device cannot notify the driver for all of the queues it
+provides via classic queue indicators (i.e. if it provides more than
+64 queues), it MUST post a unit check with command reject to
+CCW_CMD_SET_IND.
+
 \paragraph{Setting Up Configuration Change Indicators}\label{sec:Virtio Transport Options / Virtio over channel I/O / Device Initialization / Setting Up Indicators / Setting Up Configuration Change Indicators}
 
 Indicators for configuration change host->guest notification are
-- 
2.11.0



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