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
  19 static 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
  27 static 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
  34 static 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
  51 const VhostDevConfigOps vsock_ops = {
  52     .vhost_dev_config_notifier = vuv_handle_config_change,
  53 };
  54
  55 static void vuv_set_status(VirtIODevice *vdev, uint8_t status)
  56 {
  57     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
  58     bool should_start = virtio_device_should_start(vdev, status);
  59
  60     if (vhost_dev_is_started(&vvc->vhost_dev) == should_start) {
  61         return;
  62     }
  63
  64     if (should_start) {
  65         int ret = vhost_vsock_common_start(vdev);
  66         if (ret < 0) {
  67             return;
  68         }
  69     } else {
  70         vhost_vsock_common_stop(vdev);
  71     }
  72 }
  73
  74 static uint64_t vuv_get_features(VirtIODevice *vdev,
  75                                  uint64_t features,
  76                                  Error **errp)
  77 {
  78     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
  79
  80     features = vhost_get_features(&vvc->vhost_dev, user_feature_bits, features);
  81
  82     return vhost_vsock_common_get_features(vdev, features, errp);
  83 }
  84
  85 static const VMStateDescription vuv_vmstate = {
  86     .name = "vhost-user-vsock",
  87     .unmigratable = 1,
  88 };
  89
  90 static void vuv_device_realize(DeviceState *dev, Error **errp)
  91 {
  92     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
  93     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
  94     VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
  95     int ret;
  96
  97     if (!vsock->conf.chardev.chr) {
  98         error_setg(errp, "missing chardev");
  99         return;
 100     }
 101
 102     if (!vhost_user_init(&vsock->vhost_user, &vsock->conf.chardev, errp)) {
 103         return;
 104     }
 105
 106     vhost_vsock_common_realize(vdev);
 107
 108     vhost_dev_set_config_notifier(&vvc->vhost_dev, &vsock_ops);
 109
 110     ret = vhost_dev_init(&vvc->vhost_dev, &vsock->vhost_user,
 111                          VHOST_BACKEND_TYPE_USER, 0, errp);
 112     if (ret < 0) {
 113         goto err_virtio;
 114     }
 115
 116     ret = vhost_dev_get_config(&vvc->vhost_dev, (uint8_t *)&vsock->vsockcfg,
 117                                sizeof(struct virtio_vsock_config), errp);
 118     if (ret < 0) {
 119         goto err_vhost_dev;
 120     }
 121
 122     return;
 123
 124 err_vhost_dev:
 125     vhost_dev_cleanup(&vvc->vhost_dev);
 126 err_virtio:
 127     vhost_vsock_common_unrealize(vdev);
 128     vhost_user_cleanup(&vsock->vhost_user);
 129     return;
 130 }
 131
 132 static void vuv_device_unrealize(DeviceState *dev)
 133 {
 134     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
 135     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 136     VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
 137
 138     /* This will stop vhost backend if appropriate. */
 139     vuv_set_status(vdev, 0);
 140
 141     vhost_dev_cleanup(&vvc->vhost_dev);
 142
 143     vhost_vsock_common_unrealize(vdev);
 144
 145     vhost_user_cleanup(&vsock->vhost_user);
 146
 147 }
 148
 149 static Property vuv_properties[] = {
 150     DEFINE_PROP_CHR("chardev", VHostUserVSock, conf.chardev),
 151     DEFINE_PROP_END_OF_LIST(),
 152 };
 153
 154 static void vuv_class_init(ObjectClass *klass, void *data)
 155 {
 156     DeviceClass *dc = DEVICE_CLASS(klass);
 157     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 158
 159     device_class_set_props(dc, vuv_properties);
 160     dc->vmsd = &vuv_vmstate;
 161     vdc->realize = vuv_device_realize;
 162     vdc->unrealize = vuv_device_unrealize;
 163     vdc->get_features = vuv_get_features;
 164     vdc->get_config = vuv_get_config;
 165     vdc->set_status = vuv_set_status;
 166 }
 167
 168 static const TypeInfo vuv_info = {
 169     .name = TYPE_VHOST_USER_VSOCK,
 170     .parent = TYPE_VHOST_VSOCK_COMMON,
 171     .instance_size = sizeof(VHostUserVSock),
 172     .class_init = vuv_class_init,
 173 };
 174
 175 static void vuv_register_types(void)
 176 {
 177     type_register_static(&vuv_info);
 178 }
 179
 180 type_init(vuv_register_types)