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