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 void 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 62 if (vhost_dev_is_started(&vvc->vhost_dev) == 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 features = vhost_get_features(&vvc->vhost_dev, user_feature_bits, features); 83 84 return vhost_vsock_common_get_features(vdev, features, errp); 85 } 86 87 static const VMStateDescription vuv_vmstate = { 88 .name = "vhost-user-vsock", 89 .unmigratable = 1, 90 }; 91 92 static 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); 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; 125 126 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 } 132 133 static void vuv_device_unrealize(DeviceState *dev) 134 { 135 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev); 136 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 137 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev); 138 139 /* This will stop vhost backend if appropriate. */ 140 vuv_set_status(vdev, 0); 141 142 vhost_dev_cleanup(&vvc->vhost_dev); 143 144 vhost_vsock_common_unrealize(vdev); 145 146 vhost_user_cleanup(&vsock->vhost_user); 147 148 } 149 150 static const Property vuv_properties[] = { 151 DEFINE_PROP_CHR("chardev", VHostUserVSock, conf.chardev), 152 }; 153 154 static void vuv_class_init(ObjectClass *klass, const 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) 181