static void virtio_rng_device_realize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VirtIORNG *vrng = VIRTIO_RNG(dev);
Error *local_err = NULL;
if (vrng->conf.period_ms <= 0) {
error_setg(errp, "'period' parameter expects a positive integer");
return;
}
/* Workaround: Property parsing does not enforce unsigned integers,
* So this is a hack to reject such numbers. */
if (vrng->conf.max_bytes > INT64_MAX) {
error_setg(errp, "'max-bytes' parameter must be non-negative, "
"and less than 2^63");
return;
}
if (vrng->conf.rng == NULL) {
vrng->conf.default_backend = RNG_RANDOM(object_new(TYPE_RNG_RANDOM));
user_creatable_complete(OBJECT(vrng->conf.default_backend),
&local_err);
if (local_err) {
error_propagate(errp, local_err);
object_unref(OBJECT(vrng->conf.default_backend));
return;
}
object_property_add_child(OBJECT(dev),
"default-backend",
OBJECT(vrng->conf.default_backend),
NULL);
/* The child property took a reference, we can safely drop ours now */
object_unref(OBJECT(vrng->conf.default_backend));
object_property_set_link(OBJECT(dev),
OBJECT(vrng->conf.default_backend),
"rng", NULL);
}
vrng->rng = vrng->conf.rng;
if (vrng->rng == NULL) {
error_setg(errp, "'rng' parameter expects a valid object");
return;
}
virtio_init(vdev, "virtio-rng", VIRTIO_ID_RNG, 0);
vrng->vq = virtio_add_queue(vdev, 8, handle_input);
vrng->quota_remaining = vrng->conf.max_bytes;
vrng->rate_limit_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
check_rate_limit, vrng);
vrng->activate_timer = true;
register_savevm(dev, "virtio-rng", -1, 1, virtio_rng_save,
virtio_rng_load, vrng);
}
static char *rng_random_get_filename(Object *obj, Error **errp)
{
RndRandom *s = RNG_RANDOM(obj);
if (s->filename) {
return g_strdup(s->filename);
}
return NULL;
}
static void rng_random_request_entropy(RngBackend *b, RngRequest *req)
{
RndRandom *s = RNG_RANDOM(b);
if (QSIMPLEQ_EMPTY(&s->parent.requests)) {
/* If there are no pending requests yet, we need to
* install our fd handler. */
qemu_set_fd_handler(s->fd, entropy_available, NULL, s);
}
}
static void rng_random_init(Object *obj)
{
RndRandom *s = RNG_RANDOM(obj);
object_property_add_str(obj, "filename",
rng_random_get_filename,
rng_random_set_filename,
NULL);
s->filename = g_strdup("/dev/random");
}
static void rng_random_finalize(Object *obj)
{
RndRandom *s = RNG_RANDOM(obj);
if (s->fd != -1) {
qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
qemu_close(s->fd);
}
g_free(s->filename);
}
static void entropy_available(void *opaque)
{
RndRandom *s = RNG_RANDOM(opaque);
uint8_t buffer[s->size];
ssize_t len;
len = read(s->fd, buffer, s->size);
g_assert(len != -1);
s->receive_func(s->opaque, buffer, len);
s->receive_func = NULL;
qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
}
static void rng_random_opened(RngBackend *b, Error **errp)
{
RndRandom *s = RNG_RANDOM(b);
if (s->filename == NULL) {
error_set(errp, QERR_INVALID_PARAMETER_VALUE,
"filename", "a valid filename");
} else {
s->fd = qemu_open(s->filename, O_RDONLY | O_NONBLOCK);
if (s->fd == -1) {
error_setg_file_open(errp, errno, s->filename);
}
}
}
static void rng_random_set_filename(Object *obj, const char *filename,
Error **errp)
{
RngBackend *b = RNG_BACKEND(obj);
RndRandom *s = RNG_RANDOM(obj);
if (b->opened) {
error_set(errp, QERR_PERMISSION_DENIED);
return;
}
g_free(s->filename);
s->filename = g_strdup(filename);
}
static void rng_random_request_entropy(RngBackend *b, size_t size,
EntropyReceiveFunc *receive_entropy,
void *opaque)
{
RndRandom *s = RNG_RANDOM(b);
if (s->receive_func) {
s->receive_func(s->opaque, NULL, 0);
}
s->receive_func = receive_entropy;
s->opaque = opaque;
s->size = size;
qemu_set_fd_handler(s->fd, entropy_available, NULL, s);
}
static int virtio_ccw_rng_init(VirtioCcwDevice *dev)
{
VirtIODevice *vdev;
if (dev->rng.rng == NULL) {
dev->rng.default_backend = RNG_RANDOM(object_new(TYPE_RNG_RANDOM));
object_property_add_child(OBJECT(dev), "default-backend",
OBJECT(dev->rng.default_backend), NULL);
object_property_set_link(OBJECT(dev), OBJECT(dev->rng.default_backend),
"rng", NULL);
}
vdev = virtio_rng_init((DeviceState *)dev, &dev->rng);
if (!vdev) {
return -1;
}
return virtio_ccw_device_init(dev, vdev);
}
static void entropy_available(void *opaque)
{
RndRandom *s = RNG_RANDOM(opaque);
while (!QSIMPLEQ_EMPTY(&s->parent.requests)) {
RngRequest *req = QSIMPLEQ_FIRST(&s->parent.requests);
ssize_t len;
len = read(s->fd, req->data, req->size);
if (len < 0 && errno == EAGAIN) {
return;
}
g_assert(len != -1);
req->receive_entropy(req->opaque, req->data, len);
rng_backend_finalize_request(&s->parent, req);
}
/* We've drained all requests, the fd handler can be reset. */
qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
}