xref: /qemu/include/hw/virtio/virtio-rng.h (revision 65cb7129f4160c7e07a0da107f888ec73ae96776)
116c915baSAmit Shah /*
216c915baSAmit Shah  * Virtio RNG Support
316c915baSAmit Shah  *
416c915baSAmit Shah  * Copyright Red Hat, Inc. 2012
516c915baSAmit Shah  * Copyright Amit Shah <amit.shah@redhat.com>
616c915baSAmit Shah  *
716c915baSAmit Shah  * This work is licensed under the terms of the GNU GPL, version 2 or
816c915baSAmit Shah  * (at your option) any later version.  See the COPYING file in the
916c915baSAmit Shah  * top-level directory.
1016c915baSAmit Shah  */
1116c915baSAmit Shah 
122a6a4076SMarkus Armbruster #ifndef QEMU_VIRTIO_RNG_H
132a6a4076SMarkus Armbruster #define QEMU_VIRTIO_RNG_H
1416c915baSAmit Shah 
15ec150c7eSMarkus Armbruster #include "hw/virtio/virtio.h"
16*32cad1ffSPhilippe Mathieu-Daudé #include "system/rng.h"
173e96b2dbSMichael S. Tsirkin #include "standard-headers/linux/virtio_rng.h"
18db1015e9SEduardo Habkost #include "qom/object.h"
1916c915baSAmit Shah 
206eac8aecSKONRAD Frederic #define TYPE_VIRTIO_RNG "virtio-rng-device"
218063396bSEduardo Habkost OBJECT_DECLARE_SIMPLE_TYPE(VirtIORNG, VIRTIO_RNG)
22a8d57dfbSAndreas Färber #define VIRTIO_RNG_GET_PARENT_CLASS(obj) \
23a8d57dfbSAndreas Färber         OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_RNG)
246eac8aecSKONRAD Frederic 
2516c915baSAmit Shah struct VirtIORNGConf {
2616c915baSAmit Shah     RngBackend *rng;
27904d6f58SAnthony Liguori     uint64_t max_bytes;
28904d6f58SAnthony Liguori     uint32_t period_ms;
2916c915baSAmit Shah };
3016c915baSAmit Shah 
31db1015e9SEduardo Habkost struct VirtIORNG {
32611aa333SKONRAD Frederic     VirtIODevice parent_obj;
33f1b24e84SKONRAD Frederic 
34f1b24e84SKONRAD Frederic     /* Only one vq - guest puts buffer(s) on it when it needs entropy */
35f1b24e84SKONRAD Frederic     VirtQueue *vq;
36f1b24e84SKONRAD Frederic 
37af1a8ad6SKONRAD Frederic     VirtIORNGConf conf;
38f1b24e84SKONRAD Frederic 
39f1b24e84SKONRAD Frederic     RngBackend *rng;
40f1b24e84SKONRAD Frederic 
41f1b24e84SKONRAD Frederic     /* We purposefully don't migrate this state.  The quota will reset on the
42f1b24e84SKONRAD Frederic      * destination as a result.  Rate limiting is host state, not guest state.
43f1b24e84SKONRAD Frederic      */
44f1b24e84SKONRAD Frederic     QEMUTimer *rate_limit_timer;
45f1b24e84SKONRAD Frederic     int64_t quota_remaining;
46621a20e0SPankaj Gupta     bool activate_timer;
47a23a6d18SLaurent Vivier 
48a23a6d18SLaurent Vivier     VMChangeStateEntry *vmstate;
49db1015e9SEduardo Habkost };
50f1b24e84SKONRAD Frederic 
5116c915baSAmit Shah #endif
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