hw/virtio/vhost-user-rng.c

   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
  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
  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
  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)