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) 181