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     int ret = vhost_dev_get_config(dev, (uint8_t *)&vsock->vsockcfg,
  38                                    sizeof(struct virtio_vsock_config));
  39     if (ret < 0) {
  40         error_report("get config space failed");
  41         return -1;
  42     }
  43
  44     virtio_notify_config(dev->vdev);
  45
  46     return 0;
  47 }
  48
  49 const VhostDevConfigOps vsock_ops = {
  50     .vhost_dev_config_notifier = vuv_handle_config_change,
  51 };
  52
  53 static void vuv_set_status(VirtIODevice *vdev, uint8_t status)
  54 {
  55     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
  56     bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK;
  57
  58     if (!vdev->vm_running) {
  59         should_start = false;
  60     }
  61
  62     if (vvc->vhost_dev.started == should_start) {
  63         return;
  64     }
  65
  66     if (should_start) {
  67         int ret = vhost_vsock_common_start(vdev);
  68         if (ret < 0) {
  69             return;
  70         }
  71     } else {
  72         vhost_vsock_common_stop(vdev);
  73     }
  74 }
  75
  76 static uint64_t vuv_get_features(VirtIODevice *vdev,
  77                                  uint64_t features,
  78                                  Error **errp)
  79 {
  80     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
  81
  82     return vhost_get_features(&vvc->vhost_dev, user_feature_bits, features);
  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, "vhost-user-vsock");
 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);
 112     if (ret < 0) {
 113         error_setg_errno(errp, -ret, "vhost_dev_init failed");
 114         goto err_virtio;
 115     }
 116
 117     ret = vhost_dev_get_config(&vvc->vhost_dev, (uint8_t *)&vsock->vsockcfg,
 118                                sizeof(struct virtio_vsock_config));
 119     if (ret < 0) {
 120         error_setg_errno(errp, -ret, "get config space failed");
 121         goto err_vhost_dev;
 122     }
 123
 124     return;
 125
 126 err_vhost_dev:
 127     vhost_dev_cleanup(&vvc->vhost_dev);
 128 err_virtio:
 129     vhost_vsock_common_unrealize(vdev);
 130     vhost_user_cleanup(&vsock->vhost_user);
 131     return;
 132 }
 133
 134 static 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
 151 static Property vuv_properties[] = {
 152     DEFINE_PROP_CHR("chardev", VHostUserVSock, conf.chardev),
 153     DEFINE_PROP_END_OF_LIST(),
 154 };
 155
 156 static 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
 170 static 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
 177 static void vuv_register_types(void)
 178 {
 179     type_register_static(&vuv_info);
 180 }
 181
 182 type_init(vuv_register_types)