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https://gitlab.com/qemu-project/qemu
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9c4d05b741
Add a new virtio-input device, which connects to a vhost-user
backend.
Instead of reading configuration directly from an input device /
evdev (like virtio-input-host), it reads it over vhost-user protocol
with {SET,GET}_CONFIG messages. The vhost-user-backend handles the
queues & events setup.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20190503130034.24916-5-marcandre.lureau@redhat.com
[ kraxel: drop -{non-,}transitional variants ]
[ kraxel: fix "make check" on !linux ]
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
/*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* (at your option) any later version. See the COPYING file in the
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* top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/error-report.h"
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#include "qapi/error.h"
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#include "qemu-common.h"
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#include "hw/qdev.h"
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#include "hw/virtio/virtio-input.h"
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static int vhost_input_config_change(struct vhost_dev *dev)
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{
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error_report("vhost-user-input: unhandled backend config change");
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return -1;
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}
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static const VhostDevConfigOps config_ops = {
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.vhost_dev_config_notifier = vhost_input_config_change,
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};
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static void vhost_input_realize(DeviceState *dev, Error **errp)
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{
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VHostUserInput *vhi = VHOST_USER_INPUT(dev);
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VirtIOInput *vinput = VIRTIO_INPUT(dev);
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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vhost_dev_set_config_notifier(&vhi->vhost->dev, &config_ops);
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vinput->cfg_size = sizeof_field(virtio_input_config, u);
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if (vhost_user_backend_dev_init(vhi->vhost, vdev, 2, errp) == -1) {
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return;
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}
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}
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static void vhost_input_change_active(VirtIOInput *vinput)
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{
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VHostUserInput *vhi = VHOST_USER_INPUT(vinput);
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if (vinput->active) {
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vhost_user_backend_start(vhi->vhost);
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} else {
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vhost_user_backend_stop(vhi->vhost);
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}
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}
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static void vhost_input_get_config(VirtIODevice *vdev, uint8_t *config_data)
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{
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VirtIOInput *vinput = VIRTIO_INPUT(vdev);
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VHostUserInput *vhi = VHOST_USER_INPUT(vdev);
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int ret;
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memset(config_data, 0, vinput->cfg_size);
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ret = vhost_dev_get_config(&vhi->vhost->dev, config_data, vinput->cfg_size);
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if (ret) {
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error_report("vhost-user-input: get device config space failed");
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return;
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}
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}
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static void vhost_input_set_config(VirtIODevice *vdev,
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const uint8_t *config_data)
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{
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VHostUserInput *vhi = VHOST_USER_INPUT(vdev);
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int ret;
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ret = vhost_dev_set_config(&vhi->vhost->dev, config_data,
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0, sizeof(virtio_input_config),
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VHOST_SET_CONFIG_TYPE_MASTER);
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if (ret) {
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error_report("vhost-user-input: set device config space failed");
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return;
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}
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virtio_notify_config(vdev);
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}
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static const VMStateDescription vmstate_vhost_input = {
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.name = "vhost-user-input",
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.unmigratable = 1,
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};
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static void vhost_input_class_init(ObjectClass *klass, void *data)
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{
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VirtIOInputClass *vic = VIRTIO_INPUT_CLASS(klass);
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VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->vmsd = &vmstate_vhost_input;
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vdc->get_config = vhost_input_get_config;
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vdc->set_config = vhost_input_set_config;
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vic->realize = vhost_input_realize;
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vic->change_active = vhost_input_change_active;
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}
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static void vhost_input_init(Object *obj)
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{
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VHostUserInput *vhi = VHOST_USER_INPUT(obj);
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vhi->vhost = VHOST_USER_BACKEND(object_new(TYPE_VHOST_USER_BACKEND));
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object_property_add_alias(obj, "chardev",
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OBJECT(vhi->vhost), "chardev", &error_abort);
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}
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static void vhost_input_finalize(Object *obj)
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{
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VHostUserInput *vhi = VHOST_USER_INPUT(obj);
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object_unref(OBJECT(vhi->vhost));
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}
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static const TypeInfo vhost_input_info = {
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.name = TYPE_VHOST_USER_INPUT,
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.parent = TYPE_VIRTIO_INPUT,
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.instance_size = sizeof(VHostUserInput),
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.instance_init = vhost_input_init,
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.instance_finalize = vhost_input_finalize,
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.class_init = vhost_input_class_init,
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};
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static void vhost_input_register_types(void)
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{
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type_register_static(&vhost_input_info);
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}
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type_init(vhost_input_register_types)
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