hw/scsi/vhost-scsi-common.c

   1 /*
   2  * vhost-scsi-common
   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 <linux/vhost.h>
  20 #include "qapi/error.h"
  21 #include "qemu/error-report.h"
  22 #include "migration/migration.h"
  23 #include "hw/virtio/vhost.h"
  24 #include "hw/virtio/vhost-scsi-common.h"
  25 #include "hw/virtio/virtio-scsi.h"
  26 #include "hw/virtio/virtio-bus.h"
  27 #include "hw/virtio/virtio-access.h"
  28 #include "hw/fw-path-provider.h"
  29
  30 int vhost_scsi_common_start(VHostSCSICommon *vsc)
  31 {
  32     int ret, i;
  33     VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
  34     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
  35     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
  36
  37     if (!k->set_guest_notifiers) {
  38         error_report("binding does not support guest notifiers");
  39         return -ENOSYS;
  40     }
  41
  42     ret = vhost_dev_enable_notifiers(&vsc->dev, vdev);
  43     if (ret < 0) {
  44         return ret;
  45     }
  46
  47     ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, true);
  48     if (ret < 0) {
  49         error_report("Error binding guest notifier");
  50         goto err_host_notifiers;
  51     }
  52
  53     vsc->dev.acked_features = vdev->guest_features;
  54     ret = vhost_dev_start(&vsc->dev, vdev);
  55     if (ret < 0) {
  56         error_report("Error start vhost dev");
  57         goto err_guest_notifiers;
  58     }
  59
  60     /* guest_notifier_mask/pending not used yet, so just unmask
  61      * everything here.  virtio-pci will do the right thing by
  62      * enabling/disabling irqfd.
  63      */
  64     for (i = 0; i < vsc->dev.nvqs; i++) {
  65         vhost_virtqueue_mask(&vsc->dev, vdev, vsc->dev.vq_index + i, false);
  66     }
  67
  68     return ret;
  69
  70 err_guest_notifiers:
  71     k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
  72 err_host_notifiers:
  73     vhost_dev_disable_notifiers(&vsc->dev, vdev);
  74     return ret;
  75 }
  76
  77 void vhost_scsi_common_stop(VHostSCSICommon *vsc)
  78 {
  79     VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
  80     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
  81     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
  82     int ret = 0;
  83
  84     vhost_dev_stop(&vsc->dev, vdev);
  85
  86     if (k->set_guest_notifiers) {
  87         ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
  88         if (ret < 0) {
  89                 error_report("vhost guest notifier cleanup failed: %d", ret);
  90         }
  91     }
  92     assert(ret >= 0);
  93
  94     vhost_dev_disable_notifiers(&vsc->dev, vdev);
  95 }
  96
  97 uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features,
  98                                         Error **errp)
  99 {
 100     VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev);
 101
 102     return vhost_get_features(&vsc->dev, vsc->feature_bits, features);
 103 }
 104
 105 void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config)
 106 {
 107     VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
 108     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
 109
 110     if ((uint32_t)virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size ||
 111         (uint32_t)virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) {
 112         error_report("vhost-scsi does not support changing the sense data and "
 113                      "CDB sizes");
 114         exit(1);
 115     }
 116 }
 117
 118 /*
 119  * Implementation of an interface to adjust firmware path
 120  * for the bootindex property handling.
 121  */
 122 char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus,
 123                                         DeviceState *dev)
 124 {
 125     VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
 126     /* format: /channel@channel/vhost-scsi@target,lun */
 127     return g_strdup_printf("/channel@%x/%s@%x,%x", vsc->channel,
 128                            qdev_fw_name(dev), vsc->target, vsc->lun);
 129 }
 130
 131 static const TypeInfo vhost_scsi_common_info = {
 132     .name = TYPE_VHOST_SCSI_COMMON,
 133     .parent = TYPE_VIRTIO_SCSI_COMMON,
 134     .instance_size = sizeof(VHostSCSICommon),
 135     .abstract = true,
 136 };
 137
 138 static void virtio_register_types(void)
 139 {
 140     type_register_static(&vhost_scsi_common_info);
 141 }
 142
 143 type_init(virtio_register_types)