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[Qemu-devel] [PATCH] virtio-ccw: Add secondary indicators.
From: |
Heinz Graalfs |
Subject: |
[Qemu-devel] [PATCH] virtio-ccw: Add secondary indicators. |
Date: |
Tue, 11 Sep 2012 17:34:35 +0200 |
From: Cornelia Huck <address@hidden>
Add a ccw to specify the location of indicators for configuration
changes and notice how they are to be used.
Signed-off-by: Cornelia Huck <address@hidden>
---
virtio-spec.lyx | 28 +++++++++++++++++++++++++---
1 file changed, 25 insertions(+), 3 deletions(-)
diff --git a/virtio-spec.lyx b/virtio-spec.lyx
index 8247d2e..41318b1 100644
--- a/virtio-spec.lyx
+++ b/virtio-spec.lyx
@@ -9442,13 +9442,20 @@ status open
\begin_layout LyX-Code
-\change_inserted -385801441 1343732726
+\change_inserted -385801441 1347015671
#define CCW_CMD_SET_IND 0x43
\end_layout
\begin_layout LyX-Code
+\change_inserted -385801441 1347015690
+
+#define CCW_CMD_SET_CONF_IND 0x53
+\end_layout
+
+\begin_layout LyX-Code
+
\change_inserted -385801441 1343732726
#define CCW_CMD_READ_FEAT 0x12
@@ -9819,12 +9826,19 @@ Setting Up Indicators
\begin_layout Standard
-\change_inserted -385801441 1343732726
+\change_inserted -385801441 1347015710
To communicate the location of the indicator bits for host->guest notification,
the guest uses the CCW_CMD_SET_IND command which sends the guest address
of the indicators in a 64 bit value.
\end_layout
+\begin_layout Standard
+
+\change_inserted -385801441 1347015749
+For the indicator bits used in the configuration change host->guest
notification
+, the CCW_CMD_SET_CONF_IND command is used analogously.
+\end_layout
+
\begin_layout Subsection*
\change_inserted -385801441 1343732726
@@ -9839,13 +9853,21 @@ Host->Guest Notification
\begin_layout Standard
-\change_inserted -385801441 1343732726
+\change_inserted -385801441 1347015762
For notifying the guest of virtqueue buffers, the host sets the corresponding
bit in the guest-provided indicators.
If an interrupt is not already pending for the subchannel, the host generates
an unsolicited I/O interrupt.
\end_layout
+\begin_layout Standard
+
+\change_inserted -385801441 1347015847
+If the host wants to notify the guest about configuration changes, it sets
+ bit 0 in the configuration indicators and generates an unsolicited I/O
+ interrupt, if needed.
+\end_layout
+
\begin_layout Subsubsection*
\change_inserted -385801441 1343732726
--
1.7.11.5