9  * top-level directory.
12 #include "qemu/osdep.h"
14 #include "qemu/iov.h"
15 #include "qemu/module.h"
16 #include "qemu/timer.h"
18 #include "hw/qdev-properties.h"
19 #include "hw/virtio/virtio-rng.h"
28     if (virtio_queue_ready(vrng->vq)  in is_guest_ready()
29         && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {  in is_guest_ready()
68     vrng->quota_remaining -= size;  in chr_read()
72         elem = virtqueue_pop(vrng->vq, sizeof(VirtQueueElement));  in chr_read()
77         len = iov_from_buf(elem->in_sg, elem->in_num,  in chr_read()
78                            0, buf + offset, size - offset);  in chr_read()
81         virtqueue_push(vrng->vq, elem, len);  in chr_read()
85     virtio_notify(vdev, vrng->vq);  in chr_read()
87     if (!virtio_queue_empty(vrng->vq)) {  in chr_read()
104     if (vrng->activate_timer) {  in virtio_rng_process()
105         timer_mod(vrng->rate_limit_timer,  in virtio_rng_process()
106                   qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + vrng->conf.period_ms);  in virtio_rng_process()
107         vrng->activate_timer = false;  in virtio_rng_process()
110     if (vrng->quota_remaining < 0) {  in virtio_rng_process()
113         quota = MIN((uint64_t)vrng->quota_remaining, (uint64_t)UINT32_MAX);  in virtio_rng_process()
115     size = get_request_size(vrng->vq, quota);  in virtio_rng_process()
119     size = MIN(vrng->quota_remaining, size);  in virtio_rng_process()
121         rng_backend_request_entropy(vrng->rng, size, chr_read, vrng);  in virtio_rng_process()
157     vrng->quota_remaining = vrng->conf.max_bytes;  in check_rate_limit()
159     vrng->activate_timer = true;  in check_rate_limit()
166     if (!vdev->vm_running) {  in virtio_rng_set_status()
169     vdev->status = status;  in virtio_rng_set_status()
180     if (vrng->conf.period_ms <= 0) {  in virtio_rng_device_realize()
187     if (vrng->conf.max_bytes == 0 ||  in virtio_rng_device_realize()
188         vrng->conf.max_bytes > INT64_MAX) {  in virtio_rng_device_realize()
189         error_setg(errp, "'max-bytes' parameter must be positive, "  in virtio_rng_device_realize()
194     if (vrng->conf.rng == NULL) {  in virtio_rng_device_realize()
203         object_property_add_child(OBJECT(dev), "default-backend",  in virtio_rng_device_realize()
213     vrng->rng = vrng->conf.rng;  in virtio_rng_device_realize()
214     if (vrng->rng == NULL) {  in virtio_rng_device_realize()
221     vrng->vq = virtio_add_queue(vdev, 8, handle_input);  in virtio_rng_device_realize()
222     vrng->quota_remaining = vrng->conf.max_bytes;  in virtio_rng_device_realize()
223     vrng->rate_limit_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,  in virtio_rng_device_realize()
225     vrng->activate_timer = true;  in virtio_rng_device_realize()
227     vrng->vmstate = qemu_add_vm_change_state_handler(virtio_rng_vm_state_change,  in virtio_rng_device_realize()
236     qemu_del_vm_change_state_handler(vrng->vmstate);  in virtio_rng_device_unrealize()
237     timer_free(vrng->rate_limit_timer);  in virtio_rng_device_unrealize()
243     .name = "virtio-rng",
255      * and you can pass it through via virtio-rng, then hats off to you.  Until
258     DEFINE_PROP_UINT64("max-bytes", VirtIORNG, conf.max_bytes, INT64_MAX),
259     DEFINE_PROP_UINT32("period", VirtIORNG, conf.period_ms, 1 << 16),
260     DEFINE_PROP_LINK("rng", VirtIORNG, conf.rng, TYPE_RNG_BACKEND, RngBackend *),
270     dc->vmsd = &vmstate_virtio_rng;  in virtio_rng_class_init()
271     set_bit(DEVICE_CATEGORY_MISC, dc->categories);  in virtio_rng_class_init()
272     vdc->realize = virtio_rng_device_realize;  in virtio_rng_class_init()
273     vdc->unrealize = virtio_rng_device_unrealize;  in virtio_rng_class_init()
274     vdc->get_features = get_features;  in virtio_rng_class_init()
275     vdc->set_status = virtio_rng_set_status;  in virtio_rng_class_init()