qemu

FORK: QEMU emulator
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virtio-rng.h (1229B)

      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