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 = 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
  78 static uint64_t vuv_get_features(VirtIODevice *vdev,
  79                                  uint64_t features,
  80                                  Error **errp)
  81 {
  82     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
  83
  84     features = vhost_get_features(&vvc->vhost_dev, user_feature_bits, features);
  85
  86     return vhost_vsock_common_get_features(vdev, features, errp);
  87 }
  88
  89 static const VMStateDescription vuv_vmstate = {
  90     .name = "vhost-user-vsock",
  91     .unmigratable = 1,
  92 };
  93
  94 static void vuv_device_realize(DeviceState *dev, Error **errp)
  95 {
  96     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
  97     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
  98     VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
  99     int ret;
 100
 101     if (!vsock->conf.chardev.chr) {
 102         error_setg(errp, "missing chardev");
 103         return;
 104     }
 105
 106     if (!vhost_user_init(&vsock->vhost_user, &vsock->conf.chardev, errp)) {
 107         return;
 108     }
 109
 110     vhost_vsock_common_realize(vdev);
 111
 112     vhost_dev_set_config_notifier(&vvc->vhost_dev, &vsock_ops);
 113
 114     ret = vhost_dev_init(&vvc->vhost_dev, &vsock->vhost_user,
 115                          VHOST_BACKEND_TYPE_USER, 0, errp);
 116     if (ret < 0) {
 117         goto err_virtio;
 118     }
 119
 120     ret = vhost_dev_get_config(&vvc->vhost_dev, (uint8_t *)&vsock->vsockcfg,
 121                                sizeof(struct virtio_vsock_config), errp);
 122     if (ret < 0) {
 123         goto err_vhost_dev;
 124     }
 125
 126     return;
 127
 128 err_vhost_dev:
 129     vhost_dev_cleanup(&vvc->vhost_dev);
 130 err_virtio:
 131     vhost_vsock_common_unrealize(vdev);
 132     vhost_user_cleanup(&vsock->vhost_user);
 133     return;
 134 }
 135
 136 static void vuv_device_unrealize(DeviceState *dev)
 137 {
 138     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
 139     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 140     VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
 141
 142     /* This will stop vhost backend if appropriate. */
 143     vuv_set_status(vdev, 0);
 144
 145     vhost_dev_cleanup(&vvc->vhost_dev);
 146
 147     vhost_vsock_common_unrealize(vdev);
 148
 149     vhost_user_cleanup(&vsock->vhost_user);
 150
 151 }
 152
 153 static Property vuv_properties[] = {
 154     DEFINE_PROP_CHR("chardev", VHostUserVSock, conf.chardev),
 155     DEFINE_PROP_END_OF_LIST(),
 156 };
 157
 158 static void vuv_class_init(ObjectClass *klass, void *data)
 159 {
 160     DeviceClass *dc = DEVICE_CLASS(klass);
 161     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 162
 163     device_class_set_props(dc, vuv_properties);
 164     dc->vmsd = &vuv_vmstate;
 165     vdc->realize = vuv_device_realize;
 166     vdc->unrealize = vuv_device_unrealize;
 167     vdc->get_features = vuv_get_features;
 168     vdc->get_config = vuv_get_config;
 169     vdc->set_status = vuv_set_status;
 170 }
 171
 172 static const TypeInfo vuv_info = {
 173     .name = TYPE_VHOST_USER_VSOCK,
 174     .parent = TYPE_VHOST_VSOCK_COMMON,
 175     .instance_size = sizeof(VHostUserVSock),
 176     .class_init = vuv_class_init,
 177 };
 178
 179 static void vuv_register_types(void)
 180 {
 181     type_register_static(&vuv_info);
 182 }
 183
 184 type_init(vuv_register_types)