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 | |
19 | #define TYPE_VIRTIO_RNG "virtio-rng-device" |
20 | #define VIRTIO_RNG(obj) \ |
21 | OBJECT_CHECK(VirtIORNG, (obj), TYPE_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 | typedef 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 | } VirtIORNG; |
50 | |
51 | #endif |
52 | |