hw/virtio: derive vhost-user-input from vhost-user-base

This patch derives vhost-user-input from vhost-user-base class, so make
the input stub as a simpler boilerplate wrapper.

With the refactoring, vhost-user-input adds the property 'chardev', this
leads to conflict with the vhost-user-input-pci adds the same property.
To resolve the error, remove the duplicate property from
vhost-user-input-pci.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Message-Id: <20231120043721.50555-5-leo.yan@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240104210945.1223134-12-alex.bennee@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

3 files changed, 21 insertions, 102 deletions

diff --git a/hw/virtio/vhost-user-input-pci.c b/hw/virtio/vhost-user-input-pci.c
index b858898..3f4761c 100644
--- a/hw/virtio/vhost-user-input-pci.c
+++ b/hw/virtio/vhost-user-input-pci.c
@@ -30,9 +30,6 @@ static void vhost_user_input_pci_instance_init(Object *obj)
 
     virtio_instance_init_common(obj, &dev->vhi, sizeof(dev->vhi),
                                 TYPE_VHOST_USER_INPUT);
-
-    object_property_add_alias(obj, "chardev",
-                              OBJECT(&dev->vhi), "chardev");
 }
 
 static const VirtioPCIDeviceTypeInfo vhost_user_input_pci_info = {
diff --git a/hw/virtio/vhost-user-input.c b/hw/virtio/vhost-user-input.c
index 4ee3542..bedec04 100644
--- a/hw/virtio/vhost-user-input.c
+++ b/hw/virtio/vhost-user-input.c
@@ -5,83 +5,25 @@
  */
 
 #include "qemu/osdep.h"
-#include "qemu/error-report.h"
-#include "qapi/error.h"
-
 #include "hw/virtio/virtio-input.h"
 
-static int vhost_input_config_change(struct vhost_dev *dev)
-{
-    error_report("vhost-user-input: unhandled backend config change");
-    return -1;
-}
-
-static const VhostDevConfigOps config_ops = {
-    .vhost_dev_config_notifier = vhost_input_config_change,
+static Property vinput_properties[] = {
+    DEFINE_PROP_CHR("chardev", VHostUserBase, chardev),
+    DEFINE_PROP_END_OF_LIST(),
 };
 
-static void vhost_input_realize(DeviceState *dev, Error **errp)
-{
-    VHostUserInput *vhi = VHOST_USER_INPUT(dev);
-    VirtIOInput *vinput = VIRTIO_INPUT(dev);
-    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
-
-    vhost_dev_set_config_notifier(&vhi->vhost->dev, &config_ops);
-    vinput->cfg_size = sizeof_field(virtio_input_config, u);
-    if (vhost_user_backend_dev_init(vhi->vhost, vdev, 2, errp) == -1) {
-        return;
-    }
-}
-
-static void vhost_input_change_active(VirtIOInput *vinput)
-{
-    VHostUserInput *vhi = VHOST_USER_INPUT(vinput);
-
-    if (vinput->active) {
-        vhost_user_backend_start(vhi->vhost);
-    } else {
-        vhost_user_backend_stop(vhi->vhost);
-    }
-}
-
-static void vhost_input_get_config(VirtIODevice *vdev, uint8_t *config_data)
-{
-    VirtIOInput *vinput = VIRTIO_INPUT(vdev);
-    VHostUserInput *vhi = VHOST_USER_INPUT(vdev);
-    Error *local_err = NULL;
-    int ret;
-
-    memset(config_data, 0, vinput->cfg_size);
-
-    ret = vhost_dev_get_config(&vhi->vhost->dev, config_data, vinput->cfg_size,
-                               &local_err);
-    if (ret) {
-        error_report_err(local_err);
-        return;
-    }
-}
-
-static void vhost_input_set_config(VirtIODevice *vdev,
-                                   const uint8_t *config_data)
+static void vinput_realize(DeviceState *dev, Error **errp)
 {
-    VHostUserInput *vhi = VHOST_USER_INPUT(vdev);
-    int ret;
+    VHostUserBase *vub = VHOST_USER_BASE(dev);
+    VHostUserBaseClass *vubc = VHOST_USER_BASE_GET_CLASS(dev);
 
-    ret = vhost_dev_set_config(&vhi->vhost->dev, config_data,
-                               0, sizeof(virtio_input_config),
-                               VHOST_SET_CONFIG_TYPE_FRONTEND);
-    if (ret) {
-        error_report("vhost-user-input: set device config space failed");
-        return;
-    }
+    /* Fixed for input device */
+    vub->virtio_id = VIRTIO_ID_INPUT;
+    vub->num_vqs = 2;
+    vub->vq_size = 4;
+    vub->config_size = sizeof(virtio_input_config);
 
-    virtio_notify_config(vdev);
-}
-
-static struct vhost_dev *vhost_input_get_vhost(VirtIODevice *vdev)
-{
-    VHostUserInput *vhi = VHOST_USER_INPUT(vdev);
-    return &vhi->vhost->dev;
+    vubc->parent_realize(dev, errp);
 }
 
 static const VMStateDescription vmstate_vhost_input = {
@@ -91,40 +33,20 @@ static const VMStateDescription vmstate_vhost_input = {
 
 static void vhost_input_class_init(ObjectClass *klass, void *data)
 {
-    VirtIOInputClass *vic = VIRTIO_INPUT_CLASS(klass);
-    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
+    VHostUserBaseClass *vubc = VHOST_USER_BASE_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->vmsd = &vmstate_vhost_input;
-    vdc->get_config = vhost_input_get_config;
-    vdc->set_config = vhost_input_set_config;
-    vdc->get_vhost = vhost_input_get_vhost;
-    vic->realize = vhost_input_realize;
-    vic->change_active = vhost_input_change_active;
-}
-
-static void vhost_input_init(Object *obj)
-{
-    VHostUserInput *vhi = VHOST_USER_INPUT(obj);
-
-    vhi->vhost = VHOST_USER_BACKEND(object_new(TYPE_VHOST_USER_BACKEND));
-    object_property_add_alias(obj, "chardev",
-                              OBJECT(vhi->vhost), "chardev");
-}
-
-static void vhost_input_finalize(Object *obj)
-{
-    VHostUserInput *vhi = VHOST_USER_INPUT(obj);
-
-    object_unref(OBJECT(vhi->vhost));
+    device_class_set_props(dc, vinput_properties);
+    device_class_set_parent_realize(dc, vinput_realize,
+                                    &vubc->parent_realize);
+    set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
 }
 
 static const TypeInfo vhost_input_info = {
     .name          = TYPE_VHOST_USER_INPUT,
-    .parent        = TYPE_VIRTIO_INPUT,
+    .parent        = TYPE_VHOST_USER_BASE,
     .instance_size = sizeof(VHostUserInput),
-    .instance_init = vhost_input_init,
-    .instance_finalize = vhost_input_finalize,
     .class_init    = vhost_input_class_init,
 };
 
diff --git a/include/hw/virtio/virtio-input.h b/include/hw/virtio/virtio-input.h
index a6c9703..e69c0ae 100644
--- a/include/hw/virtio/virtio-input.h
+++ b/include/hw/virtio/virtio-input.h
@@ -1,6 +1,8 @@
 #ifndef QEMU_VIRTIO_INPUT_H
 #define QEMU_VIRTIO_INPUT_H
 
+#include "hw/virtio/vhost-user.h"
+#include "hw/virtio/vhost-user-base.h"
 #include "ui/input.h"
 #include "sysemu/vhost-user-backend.h"
 
@@ -97,9 +99,7 @@ struct VirtIOInputHost {
 };
 
 struct VHostUserInput {
-    VirtIOInput                       parent_obj;
-
-    VhostUserBackend                  *vhost;
+    VHostUserBase parent_obj;
 };
 
 void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event);