xref: /openbmc/qemu/hw/virtio/vhost-user-rng.c (revision 233412bf)
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