LXR qemu/hw/virtio/vhost-user-vsock.c

   1/*
   2 * Vhost-user vsock virtio device
   3 *
   4 * Copyright 2020 Red Hat, Inc.
   5 *
   6 * This work is licensed under the terms of the GNU GPL, version 2 or
   7 * (at your option) any later version.  See the COPYING file in the
   8 * top-level directory.
   9 */
  10
  11#include "qemu/osdep.h"
  12
  13#include "qapi/error.h"
  14#include "qemu/error-report.h"
  15#include "hw/qdev-properties.h"
  16#include "hw/qdev-properties-system.h"
  17#include "hw/virtio/vhost-user-vsock.h"
  18
  19static const int user_feature_bits[] = {
  20    VIRTIO_F_VERSION_1,
  21    VIRTIO_RING_F_INDIRECT_DESC,
  22    VIRTIO_RING_F_EVENT_IDX,
  23    VIRTIO_F_NOTIFY_ON_EMPTY,
  24    VHOST_INVALID_FEATURE_BIT
  25};
  26
  27static void vuv_get_config(VirtIODevice *vdev, uint8_t *config)
  28{
  29    VHostUserVSock *vsock = VHOST_USER_VSOCK(vdev);
  30
  31    memcpy(config, &vsock->vsockcfg, sizeof(struct virtio_vsock_config));
  32}
  33
  34static int vuv_handle_config_change(struct vhost_dev *dev)
  35{
  36    VHostUserVSock *vsock = VHOST_USER_VSOCK(dev->vdev);
  37    Error *local_err = NULL;
  38    int ret = vhost_dev_get_config(dev, (uint8_t *)&vsock->vsockcfg,
  39                                   sizeof(struct virtio_vsock_config),
  40                                   &local_err);
  41    if (ret < 0) {
  42        error_report_err(local_err);
  43        return -1;
  44    }
  45
  46    virtio_notify_config(dev->vdev);
  47
  48    return 0;
  49}
  50
  51const VhostDevConfigOps vsock_ops = {
  52    .vhost_dev_config_notifier = vuv_handle_config_change,
  53};
  54
  55static void vuv_set_status(VirtIODevice *vdev, uint8_t status)
  56{
  57    VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
  58    bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK;
  59
  60    if (!vdev->vm_running) {
  61        should_start = false;
  62    }
  63
  64    if (vvc->vhost_dev.started == should_start) {
  65        return;
  66    }
  67
  68    if (should_start) {
  69        int ret = vhost_vsock_common_start(vdev);
  70        if (ret < 0) {
  71            return;
  72        }
  73    } else {
  74        vhost_vsock_common_stop(vdev);
  75    }
  76}
  77
  78static uint64_t vuv_get_features(VirtIODevice *vdev,
  79                                 uint64_t features,
  80                                 Error **errp)
  81{
  82    VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
  83
  84    return vhost_get_features(&vvc->vhost_dev, user_feature_bits, features);
  85}
  86
  87static const VMStateDescription vuv_vmstate = {
  88    .name = "vhost-user-vsock",
  89    .unmigratable = 1,
  90};
  91
  92static void vuv_device_realize(DeviceState *dev, Error **errp)
  93{
  94    VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
  95    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
  96    VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
  97    int ret;
  98
  99    if (!vsock->conf.chardev.chr) {
 100        error_setg(errp, "missing chardev");
 101        return;
 102    }
 103
 104    if (!vhost_user_init(&vsock->vhost_user, &vsock->conf.chardev, errp)) {
 105        return;
 106    }
 107
 108    vhost_vsock_common_realize(vdev, "vhost-user-vsock");
 109
 110    vhost_dev_set_config_notifier(&vvc->vhost_dev, &vsock_ops);
 111
 112    ret = vhost_dev_init(&vvc->vhost_dev, &vsock->vhost_user,
 113                         VHOST_BACKEND_TYPE_USER, 0, errp);
 114    if (ret < 0) {
 115        goto err_virtio;
 116    }
 117
 118    ret = vhost_dev_get_config(&vvc->vhost_dev, (uint8_t *)&vsock->vsockcfg,
 119                               sizeof(struct virtio_vsock_config), errp);
 120    if (ret < 0) {
 121        goto err_vhost_dev;
 122    }
 123
 124    return;
 125
 126err_vhost_dev:
 127    vhost_dev_cleanup(&vvc->vhost_dev);
 128err_virtio:
 129    vhost_vsock_common_unrealize(vdev);
 130    vhost_user_cleanup(&vsock->vhost_user);
 131    return;
 132}
 133
 134static void vuv_device_unrealize(DeviceState *dev)
 135{
 136    VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
 137    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 138    VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
 139
 140    /* This will stop vhost backend if appropriate. */
 141    vuv_set_status(vdev, 0);
 142
 143    vhost_dev_cleanup(&vvc->vhost_dev);
 144
 145    vhost_vsock_common_unrealize(vdev);
 146
 147    vhost_user_cleanup(&vsock->vhost_user);
 148
 149}
 150
 151static Property vuv_properties[] = {
 152    DEFINE_PROP_CHR("chardev", VHostUserVSock, conf.chardev),
 153    DEFINE_PROP_END_OF_LIST(),
 154};
 155
 156static void vuv_class_init(ObjectClass *klass, void *data)
 157{
 158    DeviceClass *dc = DEVICE_CLASS(klass);
 159    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 160
 161    device_class_set_props(dc, vuv_properties);
 162    dc->vmsd = &vuv_vmstate;
 163    vdc->realize = vuv_device_realize;
 164    vdc->unrealize = vuv_device_unrealize;
 165    vdc->get_features = vuv_get_features;
 166    vdc->get_config = vuv_get_config;
 167    vdc->set_status = vuv_set_status;
 168}
 169
 170static const TypeInfo vuv_info = {
 171    .name = TYPE_VHOST_USER_VSOCK,
 172    .parent = TYPE_VHOST_VSOCK_COMMON,
 173    .instance_size = sizeof(VHostUserVSock),
 174    .class_init = vuv_class_init,
 175};
 176
 177static void vuv_register_types(void)
 178{
 179    type_register_static(&vuv_info);
 180}
 181
 182type_init(vuv_register_types)
 183