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 "sysemu/rng-random.h" 18 #include "standard-headers/linux/virtio_rng.h" 19 20 #define TYPE_VIRTIO_RNG "virtio-rng-device" 21 #define VIRTIO_RNG(obj) \ 22 OBJECT_CHECK(VirtIORNG, (obj), TYPE_VIRTIO_RNG) 23 #define VIRTIO_RNG_GET_PARENT_CLASS(obj) \ 24 OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_RNG) 25 26 struct VirtIORNGConf { 27 RngBackend *rng; 28 uint64_t max_bytes; 29 uint32_t period_ms; 30 RngRandom *default_backend; 31 }; 32 33 typedef struct VirtIORNG { 34 VirtIODevice parent_obj; 35 36 /* Only one vq - guest puts buffer(s) on it when it needs entropy */ 37 VirtQueue *vq; 38 39 VirtIORNGConf conf; 40 41 RngBackend *rng; 42 43 /* We purposefully don't migrate this state. The quota will reset on the 44 * destination as a result. Rate limiting is host state, not guest state. 45 */ 46 QEMUTimer *rate_limit_timer; 47 int64_t quota_remaining; 48 bool activate_timer; 49 50 VMChangeStateEntry *vmstate; 51 } VirtIORNG; 52 53 #endif 54