From fa4463e0432ab66432a28d6b975f8eed99b3f4fa Mon Sep 17 00:00:00 2001
From: Cornelia Huck <cornelia.huck@de.ibm.com>
Date: Thu, 16 Jul 2015 10:42:18 +0200
Subject: s390x/css: ccw-0 enforces count > 0

Type-0 ccws need to have a count > 0 for any command other than TIC.
Generate a channel-program check if this is not the case.

Reviewed-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
 hw/s390x/css.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'hw/s390x')

diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index 2c0782cc6a..95962808de 100644
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -290,6 +290,10 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr)
         ((ccw.cmd_code & 0xf0) != 0)) {
         return -EINVAL;
     }
+    if (!sch->ccw_fmt_1 && (ccw.count == 0) &&
+        (ccw.cmd_code != CCW_CMD_TIC)) {
+        return -EINVAL;
+    }
 
     if (ccw.flags & CCW_FLAG_SUSPEND) {
         return -EINPROGRESS;
-- 
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