1 /* 2 * vhost-user-scsi host device 3 * 4 * Copyright (c) 2016 Nutanix Inc. All rights reserved. 5 * 6 * Author: 7 * Felipe Franciosi <felipe@nutanix.com> 8 * 9 * This work is largely based on the "vhost-scsi" implementation by: 10 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> 11 * Nicholas Bellinger <nab@risingtidesystems.com> 12 * 13 * This work is licensed under the terms of the GNU LGPL, version 2 or later. 14 * See the COPYING.LIB file in the top-level directory. 15 * 16 */ 17 18 #include "qemu/osdep.h" 19 #include "qapi/error.h" 20 #include "qemu/error-report.h" 21 #include "hw/fw-path-provider.h" 22 #include "hw/qdev-core.h" 23 #include "hw/qdev-properties.h" 24 #include "hw/qdev-properties-system.h" 25 #include "hw/virtio/vhost.h" 26 #include "hw/virtio/vhost-backend.h" 27 #include "hw/virtio/vhost-user-scsi.h" 28 #include "hw/virtio/virtio.h" 29 #include "hw/virtio/virtio-access.h" 30 #include "chardev/char-fe.h" 31 #include "sysemu/sysemu.h" 32 33 /* Features supported by the host application */ 34 static const int user_feature_bits[] = { 35 VIRTIO_F_NOTIFY_ON_EMPTY, 36 VIRTIO_RING_F_INDIRECT_DESC, 37 VIRTIO_RING_F_EVENT_IDX, 38 VIRTIO_SCSI_F_HOTPLUG, 39 VHOST_INVALID_FEATURE_BIT 40 }; 41 42 enum VhostUserProtocolFeature { 43 VHOST_USER_PROTOCOL_F_RESET_DEVICE = 13, 44 }; 45 46 static void vhost_user_scsi_set_status(VirtIODevice *vdev, uint8_t status) 47 { 48 VHostUserSCSI *s = (VHostUserSCSI *)vdev; 49 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); 50 bool start = (status & VIRTIO_CONFIG_S_DRIVER_OK) && vdev->vm_running; 51 52 if (vsc->dev.started == start) { 53 return; 54 } 55 56 if (start) { 57 int ret; 58 59 ret = vhost_scsi_common_start(vsc); 60 if (ret < 0) { 61 error_report("unable to start vhost-user-scsi: %s", strerror(-ret)); 62 exit(1); 63 } 64 } else { 65 vhost_scsi_common_stop(vsc); 66 } 67 } 68 69 static void vhost_user_scsi_reset(VirtIODevice *vdev) 70 { 71 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev); 72 struct vhost_dev *dev = &vsc->dev; 73 74 /* 75 * Historically, reset was not implemented so only reset devices 76 * that are expecting it. 77 */ 78 if (!virtio_has_feature(dev->protocol_features, 79 VHOST_USER_PROTOCOL_F_RESET_DEVICE)) { 80 return; 81 } 82 83 if (dev->vhost_ops->vhost_reset_device) { 84 dev->vhost_ops->vhost_reset_device(dev); 85 } 86 } 87 88 static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq) 89 { 90 } 91 92 static void vhost_user_scsi_realize(DeviceState *dev, Error **errp) 93 { 94 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); 95 VHostUserSCSI *s = VHOST_USER_SCSI(dev); 96 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); 97 struct vhost_virtqueue *vqs = NULL; 98 Error *err = NULL; 99 int ret; 100 101 if (!vs->conf.chardev.chr) { 102 error_setg(errp, "vhost-user-scsi: missing chardev"); 103 return; 104 } 105 106 virtio_scsi_common_realize(dev, vhost_dummy_handle_output, 107 vhost_dummy_handle_output, 108 vhost_dummy_handle_output, &err); 109 if (err != NULL) { 110 error_propagate(errp, err); 111 return; 112 } 113 114 if (!vhost_user_init(&s->vhost_user, &vs->conf.chardev, errp)) { 115 goto free_virtio; 116 } 117 118 vsc->dev.nvqs = VIRTIO_SCSI_VQ_NUM_FIXED + vs->conf.num_queues; 119 vsc->dev.vqs = g_new0(struct vhost_virtqueue, vsc->dev.nvqs); 120 vsc->dev.vq_index = 0; 121 vsc->dev.backend_features = 0; 122 vqs = vsc->dev.vqs; 123 124 ret = vhost_dev_init(&vsc->dev, &s->vhost_user, 125 VHOST_BACKEND_TYPE_USER, 0, errp); 126 if (ret < 0) { 127 goto free_vhost; 128 } 129 130 /* Channel and lun both are 0 for bootable vhost-user-scsi disk */ 131 vsc->channel = 0; 132 vsc->lun = 0; 133 vsc->target = vs->conf.boot_tpgt; 134 135 return; 136 137 free_vhost: 138 vhost_user_cleanup(&s->vhost_user); 139 g_free(vqs); 140 free_virtio: 141 virtio_scsi_common_unrealize(dev); 142 } 143 144 static void vhost_user_scsi_unrealize(DeviceState *dev) 145 { 146 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 147 VHostUserSCSI *s = VHOST_USER_SCSI(dev); 148 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); 149 struct vhost_virtqueue *vqs = vsc->dev.vqs; 150 151 /* This will stop the vhost backend. */ 152 vhost_user_scsi_set_status(vdev, 0); 153 154 vhost_dev_cleanup(&vsc->dev); 155 g_free(vqs); 156 157 virtio_scsi_common_unrealize(dev); 158 vhost_user_cleanup(&s->vhost_user); 159 } 160 161 static Property vhost_user_scsi_properties[] = { 162 DEFINE_PROP_CHR("chardev", VirtIOSCSICommon, conf.chardev), 163 DEFINE_PROP_UINT32("boot_tpgt", VirtIOSCSICommon, conf.boot_tpgt, 0), 164 DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues, 165 VIRTIO_SCSI_AUTO_NUM_QUEUES), 166 DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSICommon, conf.virtqueue_size, 167 128), 168 DEFINE_PROP_UINT32("max_sectors", VirtIOSCSICommon, conf.max_sectors, 169 0xFFFF), 170 DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSICommon, conf.cmd_per_lun, 128), 171 DEFINE_PROP_BIT64("hotplug", VHostSCSICommon, host_features, 172 VIRTIO_SCSI_F_HOTPLUG, 173 true), 174 DEFINE_PROP_BIT64("param_change", VHostSCSICommon, host_features, 175 VIRTIO_SCSI_F_CHANGE, 176 true), 177 DEFINE_PROP_BIT64("t10_pi", VHostSCSICommon, host_features, 178 VIRTIO_SCSI_F_T10_PI, 179 false), 180 DEFINE_PROP_END_OF_LIST(), 181 }; 182 183 static const VMStateDescription vmstate_vhost_scsi = { 184 .name = "virtio-scsi", 185 .minimum_version_id = 1, 186 .version_id = 1, 187 .fields = (VMStateField[]) { 188 VMSTATE_VIRTIO_DEVICE, 189 VMSTATE_END_OF_LIST() 190 }, 191 }; 192 193 static void vhost_user_scsi_class_init(ObjectClass *klass, void *data) 194 { 195 DeviceClass *dc = DEVICE_CLASS(klass); 196 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 197 FWPathProviderClass *fwc = FW_PATH_PROVIDER_CLASS(klass); 198 199 device_class_set_props(dc, vhost_user_scsi_properties); 200 dc->vmsd = &vmstate_vhost_scsi; 201 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 202 vdc->realize = vhost_user_scsi_realize; 203 vdc->unrealize = vhost_user_scsi_unrealize; 204 vdc->get_features = vhost_scsi_common_get_features; 205 vdc->set_config = vhost_scsi_common_set_config; 206 vdc->set_status = vhost_user_scsi_set_status; 207 vdc->reset = vhost_user_scsi_reset; 208 fwc->get_dev_path = vhost_scsi_common_get_fw_dev_path; 209 } 210 211 static void vhost_user_scsi_instance_init(Object *obj) 212 { 213 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(obj); 214 215 vsc->feature_bits = user_feature_bits; 216 217 /* Add the bootindex property for this object */ 218 device_add_bootindex_property(obj, &vsc->bootindex, "bootindex", NULL, 219 DEVICE(vsc)); 220 } 221 222 static const TypeInfo vhost_user_scsi_info = { 223 .name = TYPE_VHOST_USER_SCSI, 224 .parent = TYPE_VHOST_SCSI_COMMON, 225 .instance_size = sizeof(VHostUserSCSI), 226 .class_init = vhost_user_scsi_class_init, 227 .instance_init = vhost_user_scsi_instance_init, 228 .interfaces = (InterfaceInfo[]) { 229 { TYPE_FW_PATH_PROVIDER }, 230 { } 231 }, 232 }; 233 234 static void virtio_register_types(void) 235 { 236 type_register_static(&vhost_user_scsi_info); 237 } 238 239 type_init(virtio_register_types) 240