s390x: add have_virtio_ccw

Git-commit: 2dd9d8cfb4f3bd30d9cdfc2edba5cb7ee5917f4b
References: bsc#1181103

Introduce a symbol which can be used to prevent ccw modules
being loaded into system emulators without ccw support.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Tested-by: Halil Pasic <pasic@linux.ibm.com>
Message-Id: <20210317095622.2839895-3-kraxel@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Bruce Rogers <brogers@suse.com>

diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 4582e94..82ec288 100644 (file)
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -35,6 +35,8 @@
 
 #define NR_CLASSIC_INDICATOR_BITS 64
 
+bool have_virtio_ccw = true;
+
 static int virtio_ccw_dev_post_load(void *opaque, int version_id)
 {
     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(opaque);

diff --git a/hw/s390x/virtio-ccw.h b/hw/s390x/virtio-ccw.h
index 49a2b8c..0168232 100644 (file)
--- a/hw/s390x/virtio-ccw.h
+++ b/hw/s390x/virtio-ccw.h
@@ -63,6 +63,11 @@ typedef struct VirtioBusClass VirtioCcwBusClass;
 DECLARE_OBJ_CHECKERS(VirtioCcwBusState, VirtioCcwBusClass,
                      VIRTIO_CCW_BUS, TYPE_VIRTIO_CCW_BUS)
 
+/*
+ * modules can reference this symbol to avoid being loaded
+ * into system emulators without ccw support
+ */
+extern bool have_virtio_ccw;
 
 struct VirtIOCCWDeviceClass {
     CCWDeviceClass parent_class;