[Qemu-devel] [PATCH v2 2/2] virtio-input: Fix device introspection on non-Linux hosts

[Markus Armbruster <armbru@redhat.com>]

When CONFIG_LINUX is off, devices "virtio-keyboard-device",
"virtio-mouse-device", "virtio-tablet-device" and
"virtio-input-host-device" aren't compiled in, yet
"virtio-keyboard-pci", "virtio-mouse-pci", "virtio-tablet-pci" and
"virtio-input-host-pci" still are.  Attempts to introspect them crash,
e.g.

    $ qemu-system-x86_64 -device virtio-tablet-pci,help
    **
    ERROR:/work/armbru/qemu/qom/object.c:333:object_initialize_with_type: assertion failed: (type != NULL)

Broken in commit 710e2d9 and commit 006a5ed.

Fix by compiling the "virtio-FOO-pci" exactly when compiling the
"virtio-FOO-device": compile "virtio-keyboard-device",
"virtio-mouse-device", "virtio-tablet-device" regardless of
CONFIG_LINUX, and compile "virtio-input-host-pci" only for
CONFIG_LINUX.

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/input/Makefile.objs |  2 +-
 hw/virtio/virtio-pci.c | 20 ++++++++++++--------
 hw/virtio/virtio-pci.h |  4 ++++
 3 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/hw/input/Makefile.objs b/hw/input/Makefile.objs
index 624ba7e..7715d72 100644
--- a/hw/input/Makefile.objs
+++ b/hw/input/Makefile.objs
@@ -8,9 +8,9 @@ common-obj-$(CONFIG_STELLARIS_INPUT) += stellaris_input.o
 common-obj-$(CONFIG_TSC2005) += tsc2005.o
 common-obj-$(CONFIG_VMMOUSE) += vmmouse.o
 
-ifeq ($(CONFIG_LINUX),y)
 common-obj-$(CONFIG_VIRTIO) += virtio-input.o
 common-obj-$(CONFIG_VIRTIO) += virtio-input-hid.o
+ifeq ($(CONFIG_LINUX),y)
 common-obj-$(CONFIG_VIRTIO) += virtio-input-host.o
 endif
 
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 6703806..e5c406d 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -2134,14 +2134,6 @@ static void virtio_tablet_initfn(Object *obj)
                                 TYPE_VIRTIO_TABLET);
 }
 
-static void virtio_host_initfn(Object *obj)
-{
-    VirtIOInputHostPCI *dev = VIRTIO_INPUT_HOST_PCI(obj);
-
-    virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
-                                TYPE_VIRTIO_INPUT_HOST);
-}
-
 static const TypeInfo virtio_input_pci_info = {
     .name          = TYPE_VIRTIO_INPUT_PCI,
     .parent        = TYPE_VIRTIO_PCI,
@@ -2180,12 +2172,22 @@ static const TypeInfo virtio_tablet_pci_info = {
     .instance_init = virtio_tablet_initfn,
 };
 
+#ifdef CONFIG_LINUX
+static void virtio_host_initfn(Object *obj)
+{
+    VirtIOInputHostPCI *dev = VIRTIO_INPUT_HOST_PCI(obj);
+
+    virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
+                                TYPE_VIRTIO_INPUT_HOST);
+}
+
 static const TypeInfo virtio_host_pci_info = {
     .name          = TYPE_VIRTIO_INPUT_HOST_PCI,
     .parent        = TYPE_VIRTIO_INPUT_PCI,
     .instance_size = sizeof(VirtIOInputHostPCI),
     .instance_init = virtio_host_initfn,
 };
+#endif
 
 /* virtio-pci-bus */
 
@@ -2233,7 +2235,9 @@ static void virtio_pci_register_types(void)
     type_register_static(&virtio_keyboard_pci_info);
     type_register_static(&virtio_mouse_pci_info);
     type_register_static(&virtio_tablet_pci_info);
+#ifdef CONFIG_LINUX
     type_register_static(&virtio_host_pci_info);
+#endif
     type_register_static(&virtio_pci_bus_info);
     type_register_static(&virtio_pci_info);
 #ifdef CONFIG_VIRTFS
diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
index b6c442f..801c23a 100644
--- a/hw/virtio/virtio-pci.h
+++ b/hw/virtio/virtio-pci.h
@@ -267,6 +267,8 @@ struct VirtIOInputHIDPCI {
     VirtIOInputHID vdev;
 };
 
+#ifdef CONFIG_LINUX
+
 #define TYPE_VIRTIO_INPUT_HOST_PCI "virtio-input-host-pci"
 #define VIRTIO_INPUT_HOST_PCI(obj) \
         OBJECT_CHECK(VirtIOInputHostPCI, (obj), TYPE_VIRTIO_INPUT_HOST_PCI)
@@ -276,6 +278,8 @@ struct VirtIOInputHostPCI {
     VirtIOInputHost vdev;
 };
 
+#endif
+
 /*
  * virtio-gpu-pci: This extends VirtioPCIProxy.
  */
-- 
2.4.3