qemu

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/*
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 * vhost-scsi-common
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 *
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 * Copyright (c) 2016 Nutanix Inc. All rights reserved.
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 *
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 * Author:
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 *  Felipe Franciosi <felipe@nutanix.com>
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 *
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 * This work is largely based on the "vhost-scsi" implementation by:
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 *  Stefan Hajnoczi    <stefanha@linux.vnet.ibm.com>
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 *  Nicholas Bellinger <nab@risingtidesystems.com>
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 *
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 * This work is licensed under the terms of the GNU LGPL, version 2 or later.
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 * See the COPYING.LIB file in the top-level directory.
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 *
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 */
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "qemu/module.h"
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#include "hw/virtio/vhost.h"
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#include "hw/virtio/vhost-scsi-common.h"
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#include "hw/virtio/virtio-scsi.h"
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#include "hw/virtio/virtio-bus.h"
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#include "hw/virtio/virtio-access.h"
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#include "hw/fw-path-provider.h"
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int vhost_scsi_common_start(VHostSCSICommon *vsc, Error **errp)
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{
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    int ret, i;
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    VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
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    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
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    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
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    VirtIOSCSICommon *vs = (VirtIOSCSICommon *)vsc;
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    if (!k->set_guest_notifiers) {
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        error_setg(errp, "binding does not support guest notifiers");
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        return -ENOSYS;
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    }
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    ret = vhost_dev_enable_notifiers(&vsc->dev, vdev);
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    if (ret < 0) {
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        error_setg_errno(errp, -ret, "Error enabling host notifiers");
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        return ret;
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    }
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    ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, true);
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    if (ret < 0) {
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        error_setg_errno(errp, -ret, "Error binding guest notifier");
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        goto err_host_notifiers;
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    }
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    vsc->dev.acked_features = vdev->guest_features;
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    ret = vhost_dev_prepare_inflight(&vsc->dev, vdev);
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    if (ret < 0) {
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        error_setg_errno(errp, -ret, "Error setting inflight format");
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        goto err_guest_notifiers;
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    }
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    if (vsc->inflight) {
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        if (!vsc->inflight->addr) {
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            ret = vhost_dev_get_inflight(&vsc->dev,
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                                        vs->conf.virtqueue_size,
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                                        vsc->inflight);
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            if (ret < 0) {
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                error_setg_errno(errp, -ret, "Error getting inflight");
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                goto err_guest_notifiers;
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            }
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        }
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        ret = vhost_dev_set_inflight(&vsc->dev, vsc->inflight);
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        if (ret < 0) {
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            error_setg_errno(errp, -ret, "Error setting inflight");
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            goto err_guest_notifiers;
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        }
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    }
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    ret = vhost_dev_start(&vsc->dev, vdev, true);
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    if (ret < 0) {
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        error_setg_errno(errp, -ret, "Error starting vhost dev");
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        goto err_guest_notifiers;
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    }
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    /* guest_notifier_mask/pending not used yet, so just unmask
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     * everything here.  virtio-pci will do the right thing by
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     * enabling/disabling irqfd.
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     */
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    for (i = 0; i < vsc->dev.nvqs; i++) {
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        vhost_virtqueue_mask(&vsc->dev, vdev, vsc->dev.vq_index + i, false);
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    }
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    return ret;
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err_guest_notifiers:
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    k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
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err_host_notifiers:
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    vhost_dev_disable_notifiers(&vsc->dev, vdev);
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    return ret;
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}
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void vhost_scsi_common_stop(VHostSCSICommon *vsc)
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{
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    VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
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    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
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    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
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    int ret = 0;
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    vhost_dev_stop(&vsc->dev, vdev, true);
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    if (k->set_guest_notifiers) {
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        ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
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        if (ret < 0) {
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                error_report("vhost guest notifier cleanup failed: %d", ret);
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        }
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    }
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    assert(ret >= 0);
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    vhost_dev_disable_notifiers(&vsc->dev, vdev);
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}
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uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features,
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                                        Error **errp)
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{
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    VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev);
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    /* Turn on predefined features supported by this device */
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    features |= vsc->host_features;
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    return vhost_get_features(&vsc->dev, vsc->feature_bits, features);
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}
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void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config)
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{
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    VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
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    VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
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    if ((uint32_t)virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size ||
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        (uint32_t)virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) {
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        error_report("vhost-scsi does not support changing the sense data and "
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                     "CDB sizes");
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        exit(1);
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    }
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}
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/*
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 * Implementation of an interface to adjust firmware path
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 * for the bootindex property handling.
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 */
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char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus,
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                                        DeviceState *dev)
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{
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    VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
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    /* format: /channel@channel/vhost-scsi@target,lun */
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    return g_strdup_printf("/channel@%x/%s@%x,%x", vsc->channel,
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                           qdev_fw_name(dev), vsc->target, vsc->lun);
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}
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static const TypeInfo vhost_scsi_common_info = {
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    .name = TYPE_VHOST_SCSI_COMMON,
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    .parent = TYPE_VIRTIO_SCSI_COMMON,
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    .instance_size = sizeof(VHostSCSICommon),
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    .abstract = true,
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};
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static void virtio_register_types(void)
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{
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    type_register_static(&vhost_scsi_common_info);
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}
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type_init(virtio_register_types)
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