s390x: bump ADAPTER_ROUTES_MAX_GSI

Let's increase ADAPTER_ROUTES_MAX_GSI to VIRTIO_QUEUE_MAX which is the
largest demand foreseeable at the moment. Let us add a compatibility
macro for the previous machines so client code can maintain backwards
migration compatibility

To not mess up migration compatibility for virtio-ccw
VIRTIO_CCW_QUEUE_MAX is left at it's current value, and will be dropped
when virtio-ccw is converted to use the capability of the flic
introduced by this patch.

Signed-off-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>

hw/s390x/s390-virtio-ccw.c

@@ -336,7 +336,12 @@ static const TypeInfo ccw_machine_info = {
     type_init(ccw_machine_register_##suffix)
 
 #define CCW_COMPAT_2_8 \
-        HW_COMPAT_2_8
+        HW_COMPAT_2_8 \
+        {\
+            .driver   = TYPE_S390_FLIC_COMMON,\
+            .property = "adapter_routes_max_batch",\
+            .value    = "64",\
+        },
 
 #define CCW_COMPAT_2_7 \
         HW_COMPAT_2_7

include/hw/s390x/s390_flic.h

@@ -17,8 +17,14 @@
 #include "hw/s390x/adapter.h"
 #include "hw/virtio/virtio.h"
 
-#define ADAPTER_ROUTES_MAX_GSI 64
-#define VIRTIO_CCW_QUEUE_MAX ADAPTER_ROUTES_MAX_GSI
+/*
+ * Reserve enough gsis to accommodate all virtio devices.
+ * If any other user of adapter routes needs more of these,
+ * we need to bump the value; but virtio looks like the
+ * maximum right now.
+ */
+#define ADAPTER_ROUTES_MAX_GSI VIRTIO_QUEUE_MAX
+#define VIRTIO_CCW_QUEUE_MAX 64
 
 typedef struct AdapterRoutes {
     AdapterInfo adapter;