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 const Property vrng_properties[] = {
24 DEFINE_PROP_CHR("chardev", VHostUserBase, chardev),
25 };
26
vu_rng_base_realize(DeviceState * dev,Error ** errp)27 static void vu_rng_base_realize(DeviceState *dev, Error **errp)
28 {
29 VHostUserBase *vub = VHOST_USER_BASE(dev);
30 VHostUserBaseClass *vubs = VHOST_USER_BASE_GET_CLASS(dev);
31
32 /* Fixed for RNG */
33 vub->virtio_id = VIRTIO_ID_RNG;
34 vub->num_vqs = 1;
35 vub->vq_size = 4;
36
37 vubs->parent_realize(dev, errp);
38 }
39
vu_rng_class_init(ObjectClass * klass,const void * data)40 static void vu_rng_class_init(ObjectClass *klass, const void *data)
41 {
42 DeviceClass *dc = DEVICE_CLASS(klass);
43 VHostUserBaseClass *vubc = VHOST_USER_BASE_CLASS(klass);
44
45 dc->vmsd = &vu_rng_vmstate;
46 device_class_set_props(dc, vrng_properties);
47 device_class_set_parent_realize(dc, vu_rng_base_realize,
48 &vubc->parent_realize);
49
50 set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
51 }
52
53 static const TypeInfo vu_rng_info = {
54 .name = TYPE_VHOST_USER_RNG,
55 .parent = TYPE_VHOST_USER_BASE,
56 .instance_size = sizeof(VHostUserRNG),
57 .class_init = vu_rng_class_init,
58 };
59
vu_rng_register_types(void)60 static void vu_rng_register_types(void)
61 {
62 type_register_static(&vu_rng_info);
63 }
64
65 type_init(vu_rng_register_types)
66