| /* |
| * vhost_scsi host device |
| * |
| * Copyright IBM, Corp. 2011 |
| * |
| * Authors: |
| * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> |
| * |
| * Changes for QEMU mainline + tcm_vhost kernel upstream: |
| * Nicholas Bellinger <nab@risingtidesystems.com> |
| * |
| * This work is licensed under the terms of the GNU LGPL, version 2 or later. |
| * See the COPYING.LIB file in the top-level directory. |
| * |
| */ |
| |
| #include "qemu/osdep.h" |
| #include <linux/vhost.h> |
| #include <sys/ioctl.h> |
| #include "qapi/error.h" |
| #include "qemu/error-report.h" |
| #include "qemu/module.h" |
| #include "monitor/monitor.h" |
| #include "migration/blocker.h" |
| #include "hw/virtio/vhost-scsi.h" |
| #include "hw/virtio/vhost.h" |
| #include "hw/virtio/virtio-scsi.h" |
| #include "hw/virtio/virtio-bus.h" |
| #include "hw/virtio/virtio-access.h" |
| #include "hw/fw-path-provider.h" |
| #include "hw/qdev-properties.h" |
| #include "qemu/cutils.h" |
| #include "sysemu/sysemu.h" |
| |
| /* Features supported by host kernel. */ |
| static const int kernel_feature_bits[] = { |
| VIRTIO_F_NOTIFY_ON_EMPTY, |
| VIRTIO_RING_F_INDIRECT_DESC, |
| VIRTIO_RING_F_EVENT_IDX, |
| VIRTIO_SCSI_F_HOTPLUG, |
| VIRTIO_F_RING_RESET, |
| VHOST_INVALID_FEATURE_BIT |
| }; |
| |
| static int vhost_scsi_set_endpoint(VHostSCSI *s) |
| { |
| VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); |
| const VhostOps *vhost_ops = vsc->dev.vhost_ops; |
| struct vhost_scsi_target backend; |
| int ret; |
| |
| memset(&backend, 0, sizeof(backend)); |
| pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->conf.wwpn); |
| ret = vhost_ops->vhost_scsi_set_endpoint(&vsc->dev, &backend); |
| if (ret < 0) { |
| return -errno; |
| } |
| return 0; |
| } |
| |
| static void vhost_scsi_clear_endpoint(VHostSCSI *s) |
| { |
| VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); |
| struct vhost_scsi_target backend; |
| const VhostOps *vhost_ops = vsc->dev.vhost_ops; |
| |
| memset(&backend, 0, sizeof(backend)); |
| pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->conf.wwpn); |
| vhost_ops->vhost_scsi_clear_endpoint(&vsc->dev, &backend); |
| } |
| |
| static int vhost_scsi_start(VHostSCSI *s) |
| { |
| int ret, abi_version; |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); |
| const VhostOps *vhost_ops = vsc->dev.vhost_ops; |
| |
| ret = vhost_ops->vhost_scsi_get_abi_version(&vsc->dev, &abi_version); |
| if (ret < 0) { |
| return -errno; |
| } |
| if (abi_version > VHOST_SCSI_ABI_VERSION) { |
| error_report("vhost-scsi: The running tcm_vhost kernel abi_version:" |
| " %d is greater than vhost_scsi userspace supports: %d," |
| " please upgrade your version of QEMU", abi_version, |
| VHOST_SCSI_ABI_VERSION); |
| return -ENOSYS; |
| } |
| |
| ret = vhost_scsi_common_start(vsc); |
| if (ret < 0) { |
| return ret; |
| } |
| |
| ret = vhost_scsi_set_endpoint(s); |
| if (ret < 0) { |
| error_report("Error setting vhost-scsi endpoint"); |
| vhost_scsi_common_stop(vsc); |
| } |
| |
| return ret; |
| } |
| |
| static void vhost_scsi_stop(VHostSCSI *s) |
| { |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); |
| |
| vhost_scsi_clear_endpoint(s); |
| vhost_scsi_common_stop(vsc); |
| } |
| |
| static void vhost_scsi_set_status(VirtIODevice *vdev, uint8_t val) |
| { |
| VHostSCSI *s = VHOST_SCSI(vdev); |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); |
| bool start = (val & VIRTIO_CONFIG_S_DRIVER_OK); |
| |
| if (!vdev->vm_running) { |
| start = false; |
| } |
| |
| if (vhost_dev_is_started(&vsc->dev) == start) { |
| return; |
| } |
| |
| if (start) { |
| int ret; |
| |
| ret = vhost_scsi_start(s); |
| if (ret < 0) { |
| error_report("unable to start vhost-scsi: %s", strerror(-ret)); |
| exit(1); |
| } |
| } else { |
| vhost_scsi_stop(s); |
| } |
| } |
| |
| static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq) |
| { |
| } |
| |
| static int vhost_scsi_pre_save(void *opaque) |
| { |
| VHostSCSICommon *vsc = opaque; |
| |
| /* At this point, backend must be stopped, otherwise |
| * it might keep writing to memory. */ |
| assert(!vhost_dev_is_started(&vsc->dev)); |
| |
| return 0; |
| } |
| |
| static const VMStateDescription vmstate_virtio_vhost_scsi = { |
| .name = "virtio-vhost_scsi", |
| .minimum_version_id = 1, |
| .version_id = 1, |
| .fields = (VMStateField[]) { |
| VMSTATE_VIRTIO_DEVICE, |
| VMSTATE_END_OF_LIST() |
| }, |
| .pre_save = vhost_scsi_pre_save, |
| }; |
| |
| static void vhost_scsi_realize(DeviceState *dev, Error **errp) |
| { |
| VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev); |
| Error *err = NULL; |
| int vhostfd = -1; |
| int ret; |
| struct vhost_virtqueue *vqs = NULL; |
| |
| if (!vs->conf.wwpn) { |
| error_setg(errp, "vhost-scsi: missing wwpn"); |
| return; |
| } |
| |
| if (vs->conf.vhostfd) { |
| vhostfd = monitor_fd_param(monitor_cur(), vs->conf.vhostfd, errp); |
| if (vhostfd == -1) { |
| error_prepend(errp, "vhost-scsi: unable to parse vhostfd: "); |
| return; |
| } |
| } else { |
| vhostfd = open("/dev/vhost-scsi", O_RDWR); |
| if (vhostfd < 0) { |
| error_setg(errp, "vhost-scsi: open vhost char device failed: %s", |
| strerror(errno)); |
| return; |
| } |
| } |
| |
| virtio_scsi_common_realize(dev, |
| vhost_dummy_handle_output, |
| vhost_dummy_handle_output, |
| vhost_dummy_handle_output, |
| &err); |
| if (err != NULL) { |
| error_propagate(errp, err); |
| goto close_fd; |
| } |
| |
| if (!vsc->migratable) { |
| error_setg(&vsc->migration_blocker, |
| "vhost-scsi does not support migration in all cases. " |
| "When external environment supports it (Orchestrator migrates " |
| "target SCSI device state or use shared storage over network), " |
| "set 'migratable' property to true to enable migration."); |
| if (migrate_add_blocker(vsc->migration_blocker, errp) < 0) { |
| goto free_virtio; |
| } |
| } |
| |
| vsc->dev.nvqs = VHOST_SCSI_VQ_NUM_FIXED + vs->conf.num_queues; |
| vqs = g_new0(struct vhost_virtqueue, vsc->dev.nvqs); |
| vsc->dev.vqs = vqs; |
| vsc->dev.vq_index = 0; |
| vsc->dev.backend_features = 0; |
| |
| ret = vhost_dev_init(&vsc->dev, (void *)(uintptr_t)vhostfd, |
| VHOST_BACKEND_TYPE_KERNEL, 0, errp); |
| if (ret < 0) { |
| /* |
| * vhost_dev_init calls vhost_dev_cleanup on error, which closes |
| * vhostfd, don't double close it. |
| */ |
| vhostfd = -1; |
| goto free_vqs; |
| } |
| |
| /* At present, channel and lun both are 0 for bootable vhost-scsi disk */ |
| vsc->channel = 0; |
| vsc->lun = 0; |
| /* Note: we can also get the minimum tpgt from kernel */ |
| vsc->target = vs->conf.boot_tpgt; |
| |
| return; |
| |
| free_vqs: |
| g_free(vqs); |
| if (!vsc->migratable) { |
| migrate_del_blocker(vsc->migration_blocker); |
| } |
| free_virtio: |
| error_free(vsc->migration_blocker); |
| virtio_scsi_common_unrealize(dev); |
| close_fd: |
| if (vhostfd >= 0) { |
| close(vhostfd); |
| } |
| return; |
| } |
| |
| static void vhost_scsi_unrealize(DeviceState *dev) |
| { |
| VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev); |
| struct vhost_virtqueue *vqs = vsc->dev.vqs; |
| |
| if (!vsc->migratable) { |
| migrate_del_blocker(vsc->migration_blocker); |
| error_free(vsc->migration_blocker); |
| } |
| |
| /* This will stop vhost backend. */ |
| vhost_scsi_set_status(vdev, 0); |
| |
| vhost_dev_cleanup(&vsc->dev); |
| g_free(vqs); |
| |
| virtio_scsi_common_unrealize(dev); |
| } |
| |
| static struct vhost_dev *vhost_scsi_get_vhost(VirtIODevice *vdev) |
| { |
| VHostSCSI *s = VHOST_SCSI(vdev); |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); |
| return &vsc->dev; |
| } |
| |
| static Property vhost_scsi_properties[] = { |
| DEFINE_PROP_STRING("vhostfd", VirtIOSCSICommon, conf.vhostfd), |
| DEFINE_PROP_STRING("wwpn", VirtIOSCSICommon, conf.wwpn), |
| DEFINE_PROP_UINT32("boot_tpgt", VirtIOSCSICommon, conf.boot_tpgt, 0), |
| DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues, |
| VIRTIO_SCSI_AUTO_NUM_QUEUES), |
| DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSICommon, conf.virtqueue_size, |
| 128), |
| DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSICommon, conf.seg_max_adjust, |
| true), |
| DEFINE_PROP_UINT32("max_sectors", VirtIOSCSICommon, conf.max_sectors, |
| 0xFFFF), |
| DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSICommon, conf.cmd_per_lun, 128), |
| DEFINE_PROP_BIT64("t10_pi", VHostSCSICommon, host_features, |
| VIRTIO_SCSI_F_T10_PI, |
| false), |
| DEFINE_PROP_BOOL("migratable", VHostSCSICommon, migratable, false), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void vhost_scsi_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
| FWPathProviderClass *fwc = FW_PATH_PROVIDER_CLASS(klass); |
| |
| device_class_set_props(dc, vhost_scsi_properties); |
| dc->vmsd = &vmstate_virtio_vhost_scsi; |
| set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); |
| vdc->realize = vhost_scsi_realize; |
| vdc->unrealize = vhost_scsi_unrealize; |
| vdc->get_features = vhost_scsi_common_get_features; |
| vdc->set_config = vhost_scsi_common_set_config; |
| vdc->set_status = vhost_scsi_set_status; |
| vdc->get_vhost = vhost_scsi_get_vhost; |
| fwc->get_dev_path = vhost_scsi_common_get_fw_dev_path; |
| } |
| |
| static void vhost_scsi_instance_init(Object *obj) |
| { |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(obj); |
| |
| vsc->feature_bits = kernel_feature_bits; |
| |
| device_add_bootindex_property(obj, &vsc->bootindex, "bootindex", NULL, |
| DEVICE(vsc)); |
| } |
| |
| static const TypeInfo vhost_scsi_info = { |
| .name = TYPE_VHOST_SCSI, |
| .parent = TYPE_VHOST_SCSI_COMMON, |
| .instance_size = sizeof(VHostSCSI), |
| .class_init = vhost_scsi_class_init, |
| .instance_init = vhost_scsi_instance_init, |
| .interfaces = (InterfaceInfo[]) { |
| { TYPE_FW_PATH_PROVIDER }, |
| { } |
| }, |
| }; |
| |
| static void virtio_register_types(void) |
| { |
| type_register_static(&vhost_scsi_info); |
| } |
| |
| type_init(virtio_register_types) |
