Merge tag 'pull-ppc-20211129' of https://github.com/legoater/qemu into staging
[qemu.git] / include / hw / virtio / virtio-rng.h
1 /*
2 * Virtio RNG Support
3 *
4 * Copyright Red Hat, Inc. 2012
5 * Copyright Amit Shah <amit.shah@redhat.com>
6 *
7 * This work is licensed under the terms of the GNU GPL, version 2 or
8 * (at your option) any later version. See the COPYING file in the
9 * top-level directory.
10 */
11
12 #ifndef QEMU_VIRTIO_RNG_H
13 #define QEMU_VIRTIO_RNG_H
14
15 #include "hw/virtio/virtio.h"
16 #include "sysemu/rng.h"
17 #include "standard-headers/linux/virtio_rng.h"
18 #include "qom/object.h"
19
20 #define TYPE_VIRTIO_RNG "virtio-rng-device"
21 OBJECT_DECLARE_SIMPLE_TYPE(VirtIORNG, VIRTIO_RNG)
22 #define VIRTIO_RNG_GET_PARENT_CLASS(obj) \
23 OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_RNG)
24
25 struct VirtIORNGConf {
26 RngBackend *rng;
27 uint64_t max_bytes;
28 uint32_t period_ms;
29 };
30
31 struct VirtIORNG {
32 VirtIODevice parent_obj;
33
34 /* Only one vq - guest puts buffer(s) on it when it needs entropy */
35 VirtQueue *vq;
36
37 VirtIORNGConf conf;
38
39 RngBackend *rng;
40
41 /* We purposefully don't migrate this state. The quota will reset on the
42 * destination as a result. Rate limiting is host state, not guest state.
43 */
44 QEMUTimer *rate_limit_timer;
45 int64_t quota_remaining;
46 bool activate_timer;
47
48 VMChangeStateEntry *vmstate;
49 };
50
51 #endif