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 VIRTIO_F_IN_ORDER, 25 VIRTIO_F_NOTIFICATION_DATA, 26 VHOST_INVALID_FEATURE_BIT 27 }; 28 29 static void vuv_get_config(VirtIODevice *vdev, uint8_t *config) 30 { 31 VHostUserVSock *vsock = VHOST_USER_VSOCK(vdev); 32 33 memcpy(config, &vsock->vsockcfg, sizeof(struct virtio_vsock_config)); 34 } 35 36 static int vuv_handle_config_change(struct vhost_dev *dev) 37 { 38 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev->vdev); 39 Error *local_err = NULL; 40 int ret = vhost_dev_get_config(dev, (uint8_t *)&vsock->vsockcfg, 41 sizeof(struct virtio_vsock_config), 42 &local_err); 43 if (ret < 0) { 44 error_report_err(local_err); 45 return -1; 46 } 47 48 virtio_notify_config(dev->vdev); 49 50 return 0; 51 } 52 53 const VhostDevConfigOps vsock_ops = { 54 .vhost_dev_config_notifier = vuv_handle_config_change, 55 }; 56 57 static int vuv_set_status(VirtIODevice *vdev, uint8_t status) 58 { 59 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); 60 bool should_start = virtio_device_should_start(vdev, status); 61 int ret; 62 63 if (vhost_dev_is_started(&vvc->vhost_dev) == should_start) { 64 return 0; 65 } 66 67 if (should_start) { 68 ret = vhost_vsock_common_start(vdev); 69 if (ret < 0) { 70 return ret; 71 } 72 } else { 73 ret = vhost_vsock_common_stop(vdev); 74 if (ret < 0) { 75 return ret; 76 } 77 } 78 return 0; 79 } 80 81 static uint64_t vuv_get_features(VirtIODevice *vdev, 82 uint64_t features, 83 Error **errp) 84 { 85 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); 86 87 features = vhost_get_features(&vvc->vhost_dev, user_feature_bits, features); 88 89 return vhost_vsock_common_get_features(vdev, features, errp); 90 } 91 92 static const VMStateDescription vuv_vmstate = { 93 .name = "vhost-user-vsock", 94 .unmigratable = 1, 95 }; 96 97 static void vuv_device_realize(DeviceState *dev, Error **errp) 98 { 99 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev); 100 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 101 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev); 102 int ret; 103 104 if (!vsock->conf.chardev.chr) { 105 error_setg(errp, "missing chardev"); 106 return; 107 } 108 109 if (!vhost_user_init(&vsock->vhost_user, &vsock->conf.chardev, errp)) { 110 return; 111 } 112 113 vhost_vsock_common_realize(vdev); 114 115 vhost_dev_set_config_notifier(&vvc->vhost_dev, &vsock_ops); 116 117 ret = vhost_dev_init(&vvc->vhost_dev, &vsock->vhost_user, 118 VHOST_BACKEND_TYPE_USER, 0, errp); 119 if (ret < 0) { 120 goto err_virtio; 121 } 122 123 ret = vhost_dev_get_config(&vvc->vhost_dev, (uint8_t *)&vsock->vsockcfg, 124 sizeof(struct virtio_vsock_config), errp); 125 if (ret < 0) { 126 goto err_vhost_dev; 127 } 128 129 return; 130 131 err_vhost_dev: 132 vhost_dev_cleanup(&vvc->vhost_dev); 133 err_virtio: 134 vhost_vsock_common_unrealize(vdev); 135 vhost_user_cleanup(&vsock->vhost_user); 136 } 137 138 static void vuv_device_unrealize(DeviceState *dev) 139 { 140 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev); 141 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 142 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev); 143 144 /* This will stop vhost backend if appropriate. */ 145 vuv_set_status(vdev, 0); 146 147 vhost_dev_cleanup(&vvc->vhost_dev); 148 149 vhost_vsock_common_unrealize(vdev); 150 151 vhost_user_cleanup(&vsock->vhost_user); 152 153 } 154 155 static const Property vuv_properties[] = { 156 DEFINE_PROP_CHR("chardev", VHostUserVSock, conf.chardev), 157 }; 158 159 static void vuv_class_init(ObjectClass *klass, const void *data) 160 { 161 DeviceClass *dc = DEVICE_CLASS(klass); 162 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 163 164 device_class_set_props(dc, vuv_properties); 165 dc->vmsd = &vuv_vmstate; 166 vdc->realize = vuv_device_realize; 167 vdc->unrealize = vuv_device_unrealize; 168 vdc->get_features = vuv_get_features; 169 vdc->get_config = vuv_get_config; 170 vdc->set_status = vuv_set_status; 171 } 172 173 static const TypeInfo vuv_info = { 174 .name = TYPE_VHOST_USER_VSOCK, 175 .parent = TYPE_VHOST_VSOCK_COMMON, 176 .instance_size = sizeof(VHostUserVSock), 177 .class_init = vuv_class_init, 178 }; 179 180 static void vuv_register_types(void) 181 { 182 type_register_static(&vuv_info); 183 } 184 185 type_init(vuv_register_types) 186