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/*
* Vhost-user vsock virtio device
*
* Copyright 2020 Red Hat, Inc.
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* (at your option) any later version. See the COPYING file in the
* top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "hw/qdev-properties.h"
#include "hw/qdev-properties-system.h"
#include "hw/virtio/vhost-user-vsock.h"
static const int user_feature_bits[] = {
VIRTIO_F_VERSION_1,
VIRTIO_RING_F_INDIRECT_DESC,
VIRTIO_RING_F_EVENT_IDX,
VIRTIO_F_NOTIFY_ON_EMPTY,
VHOST_INVALID_FEATURE_BIT
};
static void vuv_get_config(VirtIODevice *vdev, uint8_t *config)
{
VHostUserVSock *vsock = VHOST_USER_VSOCK(vdev);
memcpy(config, &vsock->vsockcfg, sizeof(struct virtio_vsock_config));
}
static int vuv_handle_config_change(struct vhost_dev *dev)
{
VHostUserVSock *vsock = VHOST_USER_VSOCK(dev->vdev);
int ret = vhost_dev_get_config(dev, (uint8_t *)&vsock->vsockcfg,
sizeof(struct virtio_vsock_config));
if (ret < 0) {
error_report("get config space failed");
return -1;
}
virtio_notify_config(dev->vdev);
return 0;
}
const VhostDevConfigOps vsock_ops = {
.vhost_dev_config_notifier = vuv_handle_config_change,
};
static void vuv_set_status(VirtIODevice *vdev, uint8_t status)
{
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK;
if (!vdev->vm_running) {
should_start = false;
}
if (vvc->vhost_dev.started == should_start) {
return;
}
if (should_start) {
int ret = vhost_vsock_common_start(vdev);
if (ret < 0) {
return;
}
} else {
vhost_vsock_common_stop(vdev);
}
}
static uint64_t vuv_get_features(VirtIODevice *vdev,
uint64_t features,
Error **errp)
{
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
return vhost_get_features(&vvc->vhost_dev, user_feature_bits, features);
}
static const VMStateDescription vuv_vmstate = {
.name = "vhost-user-vsock",
.unmigratable = 1,
};
static void vuv_device_realize(DeviceState *dev, Error **errp)
{
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
int ret;
if (!vsock->conf.chardev.chr) {
error_setg(errp, "missing chardev");
return;
}
if (!vhost_user_init(&vsock->vhost_user, &vsock->conf.chardev, errp)) {
return;
}
vhost_vsock_common_realize(vdev, "vhost-user-vsock");
vhost_dev_set_config_notifier(&vvc->vhost_dev, &vsock_ops);
ret = vhost_dev_init(&vvc->vhost_dev, &vsock->vhost_user,
VHOST_BACKEND_TYPE_USER, 0, errp);
if (ret < 0) {
goto err_virtio;
}
ret = vhost_dev_get_config(&vvc->vhost_dev, (uint8_t *)&vsock->vsockcfg,
sizeof(struct virtio_vsock_config));
if (ret < 0) {
error_setg_errno(errp, -ret, "get config space failed");
goto err_vhost_dev;
}
return;
err_vhost_dev:
vhost_dev_cleanup(&vvc->vhost_dev);
err_virtio:
vhost_vsock_common_unrealize(vdev);
vhost_user_cleanup(&vsock->vhost_user);
return;
}
static void vuv_device_unrealize(DeviceState *dev)
{
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
/* This will stop vhost backend if appropriate. */
vuv_set_status(vdev, 0);
vhost_dev_cleanup(&vvc->vhost_dev);
vhost_vsock_common_unrealize(vdev);
vhost_user_cleanup(&vsock->vhost_user);
}
static Property vuv_properties[] = {
DEFINE_PROP_CHR("chardev", VHostUserVSock, conf.chardev),
DEFINE_PROP_END_OF_LIST(),
};
static void vuv_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
device_class_set_props(dc, vuv_properties);
dc->vmsd = &vuv_vmstate;
vdc->realize = vuv_device_realize;
vdc->unrealize = vuv_device_unrealize;
vdc->get_features = vuv_get_features;
vdc->get_config = vuv_get_config;
vdc->set_status = vuv_set_status;
}
static const TypeInfo vuv_info = {
.name = TYPE_VHOST_USER_VSOCK,
.parent = TYPE_VHOST_VSOCK_COMMON,
.instance_size = sizeof(VHostUserVSock),
.class_init = vuv_class_init,
};
static void vuv_register_types(void)
{
type_register_static(&vuv_info);
}
type_init(vuv_register_types)
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