1 /*
2 * Vhost-user RNG virtio device
3 *
4 * Copyright (c) 2021 Mathieu Poirier <mathieu.poirier@linaro.org>
5 *
6 * Simple wrapper of the generic vhost-user-device.
7 *
8 * SPDX-License-Identifier: GPL-2.0-or-later
9 */
10
11 #include "qemu/osdep.h"
12 #include "qapi/error.h"
13 #include "hw/qdev-properties.h"
14 #include "hw/virtio/virtio-bus.h"
15 #include "hw/virtio/vhost-user-rng.h"
16 #include "standard-headers/linux/virtio_ids.h"
17
18 static const VMStateDescription vu_rng_vmstate = {
19 .name = "vhost-user-rng",
20 .unmigratable = 1,
21 };
22
23 static Property vrng_properties[] = {
24 DEFINE_PROP_CHR("chardev", VHostUserBase, chardev),
25 DEFINE_PROP_END_OF_LIST(),
26 };
27
vu_rng_base_realize(DeviceState * dev,Error ** errp)28 static void vu_rng_base_realize(DeviceState *dev, Error **errp)
29 {
30 VHostUserBase *vub = VHOST_USER_BASE(dev);
31 VHostUserBaseClass *vubs = VHOST_USER_BASE_GET_CLASS(dev);
32
33 /* Fixed for RNG */
34 vub->virtio_id = VIRTIO_ID_RNG;
35 vub->num_vqs = 1;
36 vub->vq_size = 4;
37
38 vubs->parent_realize(dev, errp);
39 }
40
vu_rng_class_init(ObjectClass * klass,void * data)41 static void vu_rng_class_init(ObjectClass *klass, void *data)
42 {
43 DeviceClass *dc = DEVICE_CLASS(klass);
44 VHostUserBaseClass *vubc = VHOST_USER_BASE_CLASS(klass);
45
46 dc->vmsd = &vu_rng_vmstate;
47 device_class_set_props(dc, vrng_properties);
48 device_class_set_parent_realize(dc, vu_rng_base_realize,
49 &vubc->parent_realize);
50
51 set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
52 }
53
54 static const TypeInfo vu_rng_info = {
55 .name = TYPE_VHOST_USER_RNG,
56 .parent = TYPE_VHOST_USER_BASE,
57 .instance_size = sizeof(VHostUserRNG),
58 .class_init = vu_rng_class_init,
59 };
60
vu_rng_register_types(void)61 static void vu_rng_register_types(void)
62 {
63 type_register_static(&vu_rng_info);
64 }
65
66 type_init(vu_rng_register_types)
67