s390x: add have_virtio_ccw

kraxel · kraxel · commit 2dd9d8cfb4f3 · 2021-03-26T09:33:50.000+01:00
Introduce a symbol which can be used to prevent ccw modules
being loaded into system emulators without ccw support.

Signed-off-by: Gerd Hoffmann &lt;kraxel@redhat.com&gt;
Reviewed-by: Halil Pasic &lt;pasic@linux.ibm.com&gt;
Tested-by: Halil Pasic &lt;pasic@linux.ibm.com&gt;
Message-Id: &lt;20210317095622.2839895-3-kraxel@redhat.com&gt;
Signed-off-by: Gerd Hoffmann &lt;kraxel@redhat.com&gt;
diff --git 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
@@ -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;

Original file line number	Diff line number	Diff line change
`@@ -35,6 +35,8 @@`
`35`	`35`
`36`	`36`	`#define NR_CLASSIC_INDICATOR_BITS 64`
`37`	`37`
	`38`	`+bool have_virtio_ccw = true;`
	`39`	`+`
`38`	`40`	`static int virtio_ccw_dev_post_load(void *opaque, int version_id)`
`39`	`41`	`{`
`40`	`42`	`VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(opaque);`