/* * vhost-scsi-common * * Copyright (c) 2016 Nutanix Inc. All rights reserved. * * Author: * Felipe Franciosi <felipe@nutanix.com> * * This work is largely based on the "vhost-scsi" implementation by: * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> * 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 "qemu/error-report.h" #include "qemu/module.h" #include "hw/virtio/vhost.h" #include "hw/virtio/vhost-scsi-common.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" int vhost_scsi_common_start(VHostSCSICommon *vsc) { int ret, i; VirtIODevice *vdev = VIRTIO_DEVICE(vsc); BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); if (!k->set_guest_notifiers) { error_report("binding does not support guest notifiers"); return -ENOSYS; } ret = vhost_dev_enable_notifiers(&vsc->dev, vdev); if (ret < 0) { return ret; } ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, true); if (ret < 0) { error_report("Error binding guest notifier"); goto err_host_notifiers; } vsc->dev.acked_features = vdev->guest_features; ret = vhost_dev_start(&vsc->dev, vdev); if (ret < 0) { error_report("Error start vhost dev"); goto err_guest_notifiers; } /* guest_notifier_mask/pending not used yet, so just unmask * everything here. virtio-pci will do the right thing by * enabling/disabling irqfd. */ for (i = 0; i < vsc->dev.nvqs; i++) { vhost_virtqueue_mask(&vsc->dev, vdev, vsc->dev.vq_index + i, false); } return ret; err_guest_notifiers: k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false); err_host_notifiers: vhost_dev_disable_notifiers(&vsc->dev, vdev); return ret; } void vhost_scsi_common_stop(VHostSCSICommon *vsc) { VirtIODevice *vdev = VIRTIO_DEVICE(vsc); BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); int ret = 0; vhost_dev_stop(&vsc->dev, vdev); if (k->set_guest_notifiers) { ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false); if (ret < 0) { error_report("vhost guest notifier cleanup failed: %d", ret); } } assert(ret >= 0); vhost_dev_disable_notifiers(&vsc->dev, vdev); } uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features, Error **errp) { VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev); /* Turn on predefined features supported by this device */ features |= vsc->host_features; return vhost_get_features(&vsc->dev, vsc->feature_bits, features); } void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config) { VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); if ((uint32_t)virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size || (uint32_t)virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) { error_report("vhost-scsi does not support changing the sense data and " "CDB sizes"); exit(1); } } /* * Implementation of an interface to adjust firmware path * for the bootindex property handling. */ char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus, DeviceState *dev) { VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev); /* format: /channel@channel/vhost-scsi@target,lun */ return g_strdup_printf("/channel@%x/%s@%x,%x", vsc->channel, qdev_fw_name(dev), vsc->target, vsc->lun); } static const TypeInfo vhost_scsi_common_info = { .name = TYPE_VHOST_SCSI_COMMON, .parent = TYPE_VIRTIO_SCSI_COMMON, .instance_size = sizeof(VHostSCSICommon), .abstract = true, }; static void virtio_register_types(void) { type_register_static(&vhost_scsi_common_info); } type_init(virtio_register_types)