[Qemu-devel] [PATCH 4/5] qga schema: document generic QERR_UNSUPPORTED

[Michael Roth <mdroth@linux.vnet.ibm.com>]

From: Laszlo Ersek <lersek@redhat.com>

Part of the wording was shamelessly stolen from Michael Roth's email.

Suggested-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 qga/qapi-schema.json |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 2af3515..7155b7a 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -2,6 +2,17 @@
 
 ##
 #
+# General note concerning the use of guest agent interfaces:
+#
+# "unsupported" is a higher-level error than the errors that individual
+# commands might document. The caller should always be prepared to receive
+# QERR_UNSUPPORTED, even if the given command doesn't specify it, or doesn't
+# document any failure mode at all.
+#
+##
+
+##
+#
 # Echo back a unique integer value, and prepend to response a
 # leading sentinel byte (0xFF) the client can check scan for.
 #
-- 
1.7.9.5