From adc597e5068d28dfc24093c310678188d859ea5f Mon Sep 17 00:00:00 2001 From: "cornelia.huck" Date: Thu, 12 Dec 2013 10:08:47 +0000 Subject: ccw: clarify passing of subchannel id Make clear that the upper half of the register must be ignored, just like normal I/O instructions do. Signed-off-by: Cornelia Huck git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio@172 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652 --- content.tex | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'content.tex') diff --git a/content.tex b/content.tex index b0a0ab7..b6092b6 100644 --- a/content.tex +++ b/content.tex @@ -2243,6 +2243,10 @@ GPR & Input Value & Output Value \\ \hline \end{tabular} +The device MUST ignore bits 0-31 (counting from the left) of GPR2. +This aligns passing the subchannel ID with the way it is passed +for the existing I/O instructions. + Host cookie is an optional per-virtqueue 64 bit value that can be used by the hypervisor to speed up the notification execution. For each notification, the output value is returned in GPR2 and -- cgit v1.2.3