s390x/css: introduce read-only property type for device ids

Let's introduce a read-only property type that handles device ids of the
CssDevId type used for channel devices for future use. e.g. exposing the
busid of an I/O subchannel that is assigned to a ccw device.

Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index 37caa98..f966ce2 100644
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -1894,6 +1894,13 @@ PropertyInfo css_devid_propinfo = {
     .set = set_css_devid,
 };
 
+PropertyInfo css_devid_ro_propinfo = {
+    .name = "str",
+    .description = "Read-only identifier of an I/O device in the channel "
+                   "subsystem, example: fe.1.23ab",
+    .get = get_css_devid,
+};
+
 SubchDev *css_create_virtual_sch(CssDevId bus_id, Error **errp)
 {
     uint16_t schid = 0;