297 lines
7.4 KiB
C
297 lines
7.4 KiB
C
/*
|
|
* Vhost-user RNG virtio device
|
|
*
|
|
* Copyright (c) 2021 Mathieu Poirier <mathieu.poirier@linaro.org>
|
|
*
|
|
* Implementation seriously tailored on vhost-user-i2c.c
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qapi/error.h"
|
|
#include "hw/qdev-properties.h"
|
|
#include "hw/virtio/virtio-bus.h"
|
|
#include "hw/virtio/vhost-user-rng.h"
|
|
#include "qemu/error-report.h"
|
|
#include "standard-headers/linux/virtio_ids.h"
|
|
|
|
static void vu_rng_start(VirtIODevice *vdev)
|
|
{
|
|
VHostUserRNG *rng = VHOST_USER_RNG(vdev);
|
|
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
int ret;
|
|
int i;
|
|
|
|
if (!k->set_guest_notifiers) {
|
|
error_report("binding does not support guest notifiers");
|
|
return;
|
|
}
|
|
|
|
ret = vhost_dev_enable_notifiers(&rng->vhost_dev, vdev);
|
|
if (ret < 0) {
|
|
error_report("Error enabling host notifiers: %d", -ret);
|
|
return;
|
|
}
|
|
|
|
ret = k->set_guest_notifiers(qbus->parent, rng->vhost_dev.nvqs, true);
|
|
if (ret < 0) {
|
|
error_report("Error binding guest notifier: %d", -ret);
|
|
goto err_host_notifiers;
|
|
}
|
|
|
|
rng->vhost_dev.acked_features = vdev->guest_features;
|
|
ret = vhost_dev_start(&rng->vhost_dev, vdev);
|
|
if (ret < 0) {
|
|
error_report("Error starting vhost-user-rng: %d", -ret);
|
|
goto err_guest_notifiers;
|
|
}
|
|
|
|
/*
|
|
* guest_notifier_mask/pending not used yet, so just unmask
|
|
* everything here. virtio-pci will do the right thing by
|
|
* enabling/disabling irqfd.
|
|
*/
|
|
for (i = 0; i < rng->vhost_dev.nvqs; i++) {
|
|
vhost_virtqueue_mask(&rng->vhost_dev, vdev, i, false);
|
|
}
|
|
|
|
return;
|
|
|
|
err_guest_notifiers:
|
|
k->set_guest_notifiers(qbus->parent, rng->vhost_dev.nvqs, false);
|
|
err_host_notifiers:
|
|
vhost_dev_disable_notifiers(&rng->vhost_dev, vdev);
|
|
}
|
|
|
|
static void vu_rng_stop(VirtIODevice *vdev)
|
|
{
|
|
VHostUserRNG *rng = VHOST_USER_RNG(vdev);
|
|
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
int ret;
|
|
|
|
if (!k->set_guest_notifiers) {
|
|
return;
|
|
}
|
|
|
|
vhost_dev_stop(&rng->vhost_dev, vdev);
|
|
|
|
ret = k->set_guest_notifiers(qbus->parent, rng->vhost_dev.nvqs, false);
|
|
if (ret < 0) {
|
|
error_report("vhost guest notifier cleanup failed: %d", ret);
|
|
return;
|
|
}
|
|
|
|
vhost_dev_disable_notifiers(&rng->vhost_dev, vdev);
|
|
}
|
|
|
|
static void vu_rng_set_status(VirtIODevice *vdev, uint8_t status)
|
|
{
|
|
VHostUserRNG *rng = VHOST_USER_RNG(vdev);
|
|
bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK;
|
|
|
|
if (!vdev->vm_running) {
|
|
should_start = false;
|
|
}
|
|
|
|
if (rng->vhost_dev.started == should_start) {
|
|
return;
|
|
}
|
|
|
|
if (should_start) {
|
|
vu_rng_start(vdev);
|
|
} else {
|
|
vu_rng_stop(vdev);
|
|
}
|
|
}
|
|
|
|
static uint64_t vu_rng_get_features(VirtIODevice *vdev,
|
|
uint64_t requested_features, Error **errp)
|
|
{
|
|
/* No feature bits used yet */
|
|
return requested_features;
|
|
}
|
|
|
|
static void vu_rng_handle_output(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
/*
|
|
* Not normally called; it's the daemon that handles the queue;
|
|
* however virtio's cleanup path can call this.
|
|
*/
|
|
}
|
|
|
|
static void vu_rng_guest_notifier_mask(VirtIODevice *vdev, int idx, bool mask)
|
|
{
|
|
VHostUserRNG *rng = VHOST_USER_RNG(vdev);
|
|
|
|
vhost_virtqueue_mask(&rng->vhost_dev, vdev, idx, mask);
|
|
}
|
|
|
|
static bool vu_rng_guest_notifier_pending(VirtIODevice *vdev, int idx)
|
|
{
|
|
VHostUserRNG *rng = VHOST_USER_RNG(vdev);
|
|
|
|
return vhost_virtqueue_pending(&rng->vhost_dev, idx);
|
|
}
|
|
|
|
static void vu_rng_connect(DeviceState *dev)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VHostUserRNG *rng = VHOST_USER_RNG(vdev);
|
|
|
|
if (rng->connected) {
|
|
return;
|
|
}
|
|
|
|
rng->connected = true;
|
|
|
|
/* restore vhost state */
|
|
if (virtio_device_started(vdev, vdev->status)) {
|
|
vu_rng_start(vdev);
|
|
}
|
|
}
|
|
|
|
static void vu_rng_disconnect(DeviceState *dev)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VHostUserRNG *rng = VHOST_USER_RNG(vdev);
|
|
|
|
if (!rng->connected) {
|
|
return;
|
|
}
|
|
|
|
rng->connected = false;
|
|
|
|
if (rng->vhost_dev.started) {
|
|
vu_rng_stop(vdev);
|
|
}
|
|
}
|
|
|
|
static void vu_rng_event(void *opaque, QEMUChrEvent event)
|
|
{
|
|
DeviceState *dev = opaque;
|
|
|
|
switch (event) {
|
|
case CHR_EVENT_OPENED:
|
|
vu_rng_connect(dev);
|
|
break;
|
|
case CHR_EVENT_CLOSED:
|
|
vu_rng_disconnect(dev);
|
|
break;
|
|
case CHR_EVENT_BREAK:
|
|
case CHR_EVENT_MUX_IN:
|
|
case CHR_EVENT_MUX_OUT:
|
|
/* Ignore */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void vu_rng_device_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VHostUserRNG *rng = VHOST_USER_RNG(dev);
|
|
int ret;
|
|
|
|
if (!rng->chardev.chr) {
|
|
error_setg(errp, "missing chardev");
|
|
return;
|
|
}
|
|
|
|
if (!vhost_user_init(&rng->vhost_user, &rng->chardev, errp)) {
|
|
return;
|
|
}
|
|
|
|
virtio_init(vdev, VIRTIO_ID_RNG, 0);
|
|
|
|
rng->req_vq = virtio_add_queue(vdev, 4, vu_rng_handle_output);
|
|
if (!rng->req_vq) {
|
|
error_setg_errno(errp, -1, "virtio_add_queue() failed");
|
|
goto virtio_add_queue_failed;
|
|
}
|
|
|
|
rng->vhost_dev.nvqs = 1;
|
|
rng->vhost_dev.vqs = g_new0(struct vhost_virtqueue, rng->vhost_dev.nvqs);
|
|
ret = vhost_dev_init(&rng->vhost_dev, &rng->vhost_user,
|
|
VHOST_BACKEND_TYPE_USER, 0, errp);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "vhost_dev_init() failed");
|
|
goto vhost_dev_init_failed;
|
|
}
|
|
|
|
qemu_chr_fe_set_handlers(&rng->chardev, NULL, NULL, vu_rng_event, NULL,
|
|
dev, NULL, true);
|
|
|
|
return;
|
|
|
|
vhost_dev_init_failed:
|
|
virtio_delete_queue(rng->req_vq);
|
|
virtio_add_queue_failed:
|
|
virtio_cleanup(vdev);
|
|
vhost_user_cleanup(&rng->vhost_user);
|
|
}
|
|
|
|
static void vu_rng_device_unrealize(DeviceState *dev)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VHostUserRNG *rng = VHOST_USER_RNG(dev);
|
|
|
|
vu_rng_set_status(vdev, 0);
|
|
|
|
vhost_dev_cleanup(&rng->vhost_dev);
|
|
g_free(rng->vhost_dev.vqs);
|
|
rng->vhost_dev.vqs = NULL;
|
|
virtio_delete_queue(rng->req_vq);
|
|
virtio_cleanup(vdev);
|
|
vhost_user_cleanup(&rng->vhost_user);
|
|
}
|
|
|
|
static struct vhost_dev *vu_rng_get_vhost(VirtIODevice *vdev)
|
|
{
|
|
VHostUserRNG *rng = VHOST_USER_RNG(vdev);
|
|
return &rng->vhost_dev;
|
|
}
|
|
|
|
static const VMStateDescription vu_rng_vmstate = {
|
|
.name = "vhost-user-rng",
|
|
.unmigratable = 1,
|
|
};
|
|
|
|
static Property vu_rng_properties[] = {
|
|
DEFINE_PROP_CHR("chardev", VHostUserRNG, chardev),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void vu_rng_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
|
|
|
device_class_set_props(dc, vu_rng_properties);
|
|
dc->vmsd = &vu_rng_vmstate;
|
|
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
|
|
|
|
vdc->realize = vu_rng_device_realize;
|
|
vdc->unrealize = vu_rng_device_unrealize;
|
|
vdc->get_features = vu_rng_get_features;
|
|
vdc->set_status = vu_rng_set_status;
|
|
vdc->guest_notifier_mask = vu_rng_guest_notifier_mask;
|
|
vdc->guest_notifier_pending = vu_rng_guest_notifier_pending;
|
|
vdc->get_vhost = vu_rng_get_vhost;
|
|
}
|
|
|
|
static const TypeInfo vu_rng_info = {
|
|
.name = TYPE_VHOST_USER_RNG,
|
|
.parent = TYPE_VIRTIO_DEVICE,
|
|
.instance_size = sizeof(VHostUserRNG),
|
|
.class_init = vu_rng_class_init,
|
|
};
|
|
|
|
static void vu_rng_register_types(void)
|
|
{
|
|
type_register_static(&vu_rng_info);
|
|
}
|
|
|
|
type_init(vu_rng_register_types)
|