virtio-input: evdev passthrough

This allows to assign host input devices to the guest:

qemu -device virtio-input-host-pci,evdev=/dev/input/event<nr>

The guest gets exclusive access to the input device, so be careful
with assigning the keyboard if you have only one connected to your
machine.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/hw/virtio/virtio-input.h b/include/hw/virtio/virtio-input.h
index 8160dd6..fd5417d 100644
--- a/include/hw/virtio/virtio-input.h
+++ b/include/hw/virtio/virtio-input.h
@@ -50,10 +50,17 @@ typedef struct virtio_input_event virtio_input_event;
 #define VIRTIO_INPUT_HID_GET_PARENT_CLASS(obj) \
         OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_INPUT_HID)
 
+#define TYPE_VIRTIO_INPUT_HOST   "virtio-input-host-device"
+#define VIRTIO_INPUT_HOST(obj) \
+        OBJECT_CHECK(VirtIOInputHost, (obj), TYPE_VIRTIO_INPUT_HOST)
+#define VIRTIO_INPUT_HOST_GET_PARENT_CLASS(obj) \
+        OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_INPUT_HOST)
+
 typedef struct VirtIOInput VirtIOInput;
 typedef struct VirtIOInputClass VirtIOInputClass;
 typedef struct VirtIOInputConfig VirtIOInputConfig;
 typedef struct VirtIOInputHID VirtIOInputHID;
+typedef struct VirtIOInputHost VirtIOInputHost;
 
 struct VirtIOInputConfig {
     virtio_input_config               config;
@@ -93,6 +100,12 @@ struct VirtIOInputHID {
     int                               ledstate;
 };
 
+struct VirtIOInputHost {
+    VirtIOInput                       parent_obj;
+    char                              *evdev;
+    int                               fd;
+};
+
 void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event);
 void virtio_input_init_config(VirtIOInput *vinput,
                               virtio_input_config *config);