| /* |
| * Virtio RNG Support |
| * |
| * Copyright Red Hat, Inc. 2012 |
| * Copyright Amit Shah <amit.shah@redhat.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2 or |
| * (at your option) any later version. See the COPYING file in the |
| * top-level directory. |
| */ |
| |
| #ifndef _QEMU_VIRTIO_RNG_H |
| #define _QEMU_VIRTIO_RNG_H |
| |
| #include "sysemu/rng.h" |
| #include "sysemu/rng-random.h" |
| |
| #define TYPE_VIRTIO_RNG "virtio-rng-device" |
| #define VIRTIO_RNG(obj) \ |
| OBJECT_CHECK(VirtIORNG, (obj), TYPE_VIRTIO_RNG) |
| #define VIRTIO_RNG_GET_PARENT_CLASS(obj) \ |
| OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_RNG) |
| |
| /* The Virtio ID for the virtio rng device */ |
| #define VIRTIO_ID_RNG 4 |
| |
| struct VirtIORNGConf { |
| RngBackend *rng; |
| uint64_t max_bytes; |
| uint32_t period_ms; |
| RndRandom *default_backend; |
| }; |
| |
| typedef struct VirtIORNG { |
| VirtIODevice parent_obj; |
| |
| /* Only one vq - guest puts buffer(s) on it when it needs entropy */ |
| VirtQueue *vq; |
| |
| VirtIORNGConf conf; |
| |
| RngBackend *rng; |
| |
| /* We purposefully don't migrate this state. The quota will reset on the |
| * destination as a result. Rate limiting is host state, not guest state. |
| */ |
| QEMUTimer *rate_limit_timer; |
| int64_t quota_remaining; |
| } VirtIORNG; |
| |
| /* Set a default rate limit of 2^47 bytes per minute or roughly 2TB/s. If |
| you have an entropy source capable of generating more entropy than this |
| and you can pass it through via virtio-rng, then hats off to you. Until |
| then, this is unlimited for all practical purposes. |
| */ |
| #define DEFINE_VIRTIO_RNG_PROPERTIES(_state, _conf_field) \ |
| DEFINE_PROP_UINT64("max-bytes", _state, _conf_field.max_bytes, \ |
| INT64_MAX), \ |
| DEFINE_PROP_UINT32("period", _state, _conf_field.period_ms, 1 << 16) |
| |
| #endif |