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/virtio/vhost-user-vsock.h" 17 18 static const int user_feature_bits[] = { 19 VIRTIO_F_VERSION_1, 20 VIRTIO_RING_F_INDIRECT_DESC, 21 VIRTIO_RING_F_EVENT_IDX, 22 VIRTIO_F_NOTIFY_ON_EMPTY, 23 VHOST_INVALID_FEATURE_BIT 24 }; 25 26 static void vuv_get_config(VirtIODevice *vdev, uint8_t *config) 27 { 28 VHostUserVSock *vsock = VHOST_USER_VSOCK(vdev); 29 30 memcpy(config, &vsock->vsockcfg, sizeof(struct virtio_vsock_config)); 31 } 32 33 static int vuv_handle_config_change(struct vhost_dev *dev) 34 { 35 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev->vdev); 36 int ret = vhost_dev_get_config(dev, (uint8_t *)&vsock->vsockcfg, 37 sizeof(struct virtio_vsock_config)); 38 if (ret < 0) { 39 error_report("get config space failed"); 40 return -1; 41 } 42 43 virtio_notify_config(dev->vdev); 44 45 return 0; 46 } 47 48 const VhostDevConfigOps vsock_ops = { 49 .vhost_dev_config_notifier = vuv_handle_config_change, 50 }; 51 52 static void vuv_set_status(VirtIODevice *vdev, uint8_t status) 53 { 54 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); 55 bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK; 56 57 if (!vdev->vm_running) { 58 should_start = false; 59 } 60 61 if (vvc->vhost_dev.started == should_start) { 62 return; 63 } 64 65 if (should_start) { 66 int ret = vhost_vsock_common_start(vdev); 67 if (ret < 0) { 68 return; 69 } 70 } else { 71 vhost_vsock_common_stop(vdev); 72 } 73 } 74 75 static uint64_t vuv_get_features(VirtIODevice *vdev, 76 uint64_t features, 77 Error **errp) 78 { 79 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); 80 81 return vhost_get_features(&vvc->vhost_dev, user_feature_bits, features); 82 } 83 84 static const VMStateDescription vuv_vmstate = { 85 .name = "vhost-user-vsock", 86 .unmigratable = 1, 87 }; 88 89 static void vuv_device_realize(DeviceState *dev, Error **errp) 90 { 91 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev); 92 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 93 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev); 94 int ret; 95 96 if (!vsock->conf.chardev.chr) { 97 error_setg(errp, "missing chardev"); 98 return; 99 } 100 101 if (!vhost_user_init(&vsock->vhost_user, &vsock->conf.chardev, errp)) { 102 return; 103 } 104 105 vhost_vsock_common_realize(vdev, "vhost-user-vsock"); 106 107 vhost_dev_set_config_notifier(&vvc->vhost_dev, &vsock_ops); 108 109 ret = vhost_dev_init(&vvc->vhost_dev, &vsock->vhost_user, 110 VHOST_BACKEND_TYPE_USER, 0); 111 if (ret < 0) { 112 error_setg_errno(errp, -ret, "vhost_dev_init failed"); 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)); 118 if (ret < 0) { 119 error_setg_errno(errp, -ret, "get config space failed"); 120 goto err_vhost_dev; 121 } 122 123 return; 124 125 err_vhost_dev: 126 vhost_dev_cleanup(&vvc->vhost_dev); 127 err_virtio: 128 vhost_vsock_common_unrealize(vdev); 129 vhost_user_cleanup(&vsock->vhost_user); 130 return; 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 Property vuv_properties[] = { 151 DEFINE_PROP_CHR("chardev", VHostUserVSock, conf.chardev), 152 DEFINE_PROP_END_OF_LIST(), 153 }; 154 155 static void vuv_class_init(ObjectClass *klass, void *data) 156 { 157 DeviceClass *dc = DEVICE_CLASS(klass); 158 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 159 160 device_class_set_props(dc, vuv_properties); 161 dc->vmsd = &vuv_vmstate; 162 vdc->realize = vuv_device_realize; 163 vdc->unrealize = vuv_device_unrealize; 164 vdc->get_features = vuv_get_features; 165 vdc->get_config = vuv_get_config; 166 vdc->set_status = vuv_set_status; 167 } 168 169 static const TypeInfo vuv_info = { 170 .name = TYPE_VHOST_USER_VSOCK, 171 .parent = TYPE_VHOST_VSOCK_COMMON, 172 .instance_size = sizeof(VHostUserVSock), 173 .class_init = vuv_class_init, 174 }; 175 176 static void vuv_register_types(void) 177 { 178 type_register_static(&vuv_info); 179 } 180 181 type_init(vuv_register_types) 182