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>

2 files changed, 26 insertions, 0 deletions

diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 1187a580eb..70bc6d801e 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1969,6 +1969,14 @@ 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,
@@ -2007,6 +2015,13 @@ static const TypeInfo virtio_tablet_pci_info = {
     .instance_init = virtio_tablet_initfn,
 };
 
+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,
+};
+
 /* virtio-pci-bus */
 
 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
@@ -2053,6 +2068,7 @@ 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);
+    type_register_static(&virtio_host_pci_info);
     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 96025ca205..05d9d243f6 100644
--- a/hw/virtio/virtio-pci.h
+++ b/hw/virtio/virtio-pci.h
@@ -43,6 +43,7 @@ typedef struct VHostSCSIPCI VHostSCSIPCI;
 typedef struct VirtIORngPCI VirtIORngPCI;
 typedef struct VirtIOInputPCI VirtIOInputPCI;
 typedef struct VirtIOInputHIDPCI VirtIOInputHIDPCI;
+typedef struct VirtIOInputHostPCI VirtIOInputHostPCI;
 typedef struct VirtIOGPUPCI VirtIOGPUPCI;
 
 /* virtio-pci-bus */
@@ -263,6 +264,15 @@ struct VirtIOInputHIDPCI {
     VirtIOInputHID vdev;
 };
 
+#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)
+
+struct VirtIOInputHostPCI {
+    VirtIOPCIProxy parent_obj;
+    VirtIOInputHost vdev;
+};
+
 /*
  * virtio-gpu-pci: This extends VirtioPCIProxy.
  */