s390x: Add individual loadparm assignment to CCW device

Add a loadparm property to the VirtioCcwDevice object so that different
loadparms can be defined on a per-device basis for CCW boot devices.

The machine/global loadparm is still supported. If both a global and per-device
loadparm are defined, the per-device value will override the global value for
that device, but any other devices that do not specify a per-device loadparm
will still use the global loadparm.

It is invalid to assign a loadparm to a non-boot device.

Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241020012953.1380075-15-jrossi@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/hw/s390x/ccw-device.c b/hw/s390x/ccw-device.c
index 14c24e3890..230cc09e03 100644
--- a/hw/s390x/ccw-device.c
+++ b/hw/s390x/ccw-device.c
@@ -13,6 +13,10 @@
 #include "ccw-device.h"
 #include "hw/qdev-properties.h"
 #include "qemu/module.h"
+#include "ipl.h"
+#include "qapi/visitor.h"
+#include "qemu/ctype.h"
+#include "qapi/error.h"
 
 static void ccw_device_refill_ids(CcwDevice *dev)
 {
@@ -37,10 +41,52 @@ static bool ccw_device_realize(CcwDevice *dev, Error **errp)
     return true;
 }
 
+static void ccw_device_get_loadparm(Object *obj, Visitor *v,
+                                 const char *name, void *opaque,
+                                 Error **errp)
+{
+    CcwDevice *dev = CCW_DEVICE(obj);
+    char *str = g_strndup((char *) dev->loadparm, sizeof(dev->loadparm));
+
+    visit_type_str(v, name, &str, errp);
+    g_free(str);
+}
+
+static void ccw_device_set_loadparm(Object *obj, Visitor *v,
+                                 const char *name, void *opaque,
+                                 Error **errp)
+{
+    CcwDevice *dev = CCW_DEVICE(obj);
+    char *val;
+    int index;
+
+    index = object_property_get_int(obj, "bootindex", NULL);
+
+    if (index < 0) {
+        error_setg(errp, "LOADPARM is only valid for boot devices!");
+    }
+
+    if (!visit_type_str(v, name, &val, errp)) {
+        return;
+    }
+
+    s390_ipl_fmt_loadparm(dev->loadparm, val, errp);
+}
+
+static const PropertyInfo ccw_loadparm = {
+    .name  = "ccw_loadparm",
+    .description = "Up to 8 chars in set of [A-Za-z0-9. ] to pass"
+            " to the guest loader/kernel",
+    .get = ccw_device_get_loadparm,
+    .set = ccw_device_set_loadparm,
+};
+
 static Property ccw_device_properties[] = {
     DEFINE_PROP_CSS_DEV_ID("devno", CcwDevice, devno),
     DEFINE_PROP_CSS_DEV_ID_RO("dev_id", CcwDevice, dev_id),
     DEFINE_PROP_CSS_DEV_ID_RO("subch_id", CcwDevice, subch_id),
+    DEFINE_PROP("loadparm", CcwDevice, loadparm, ccw_loadparm,
+            typeof(uint8_t[8])),
     DEFINE_PROP_END_OF_LIST(),
 };