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* vhost_scsi host device
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* Copyright IBM, Corp. 2011
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* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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* Changes for QEMU mainline + tcm_vhost kernel upstream:
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* Nicholas Bellinger <nab@risingtidesystems.com>
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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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#include <sys/ioctl.h>
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#include "qemu/queue.h"
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#include "monitor/monitor.h"
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#include "migration/migration.h"
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#include "hw/virtio/vhost-scsi.h"
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#include "hw/virtio/vhost.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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static int vhost_scsi_set_endpoint(VHostSCSI *s)
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VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
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struct vhost_scsi_target backend;
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memset(&backend, 0, sizeof(backend));
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pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->conf.wwpn);
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ret = ioctl(s->dev.control, VHOST_SCSI_SET_ENDPOINT, &backend);
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static void vhost_scsi_clear_endpoint(VHostSCSI *s)
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VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
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struct vhost_scsi_target backend;
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memset(&backend, 0, sizeof(backend));
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pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->conf.wwpn);
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ioctl(s->dev.control, VHOST_SCSI_CLEAR_ENDPOINT, &backend);
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static int vhost_scsi_start(VHostSCSI *s)
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int ret, abi_version, i;
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VirtIODevice *vdev = VIRTIO_DEVICE(s);
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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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if (!k->set_guest_notifiers) {
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error_report("binding does not support guest notifiers");
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ret = ioctl(s->dev.control, VHOST_SCSI_GET_ABI_VERSION, &abi_version);
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if (abi_version > VHOST_SCSI_ABI_VERSION) {
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error_report("vhost-scsi: The running tcm_vhost kernel abi_version:"
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" %d is greater than vhost_scsi userspace supports: %d, please"
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" upgrade your version of QEMU\n", abi_version,
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VHOST_SCSI_ABI_VERSION);
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ret = vhost_dev_enable_notifiers(&s->dev, vdev);
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s->dev.acked_features = vdev->guest_features;
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ret = vhost_dev_start(&s->dev, vdev);
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error_report("Error start vhost dev");
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ret = vhost_scsi_set_endpoint(s);
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error_report("Error set vhost-scsi endpoint");
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ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, true);
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error_report("Error binding guest notifier");
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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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for (i = 0; i < s->dev.nvqs; i++) {
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vhost_virtqueue_mask(&s->dev, vdev, i, false);
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vhost_scsi_clear_endpoint(s);
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vhost_dev_stop(&s->dev, vdev);
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vhost_dev_disable_notifiers(&s->dev, vdev);
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static void vhost_scsi_stop(VHostSCSI *s)
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VirtIODevice *vdev = VIRTIO_DEVICE(s);
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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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if (k->set_guest_notifiers) {
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ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, false);
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error_report("vhost guest notifier cleanup failed: %d\n", ret);
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vhost_scsi_clear_endpoint(s);
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vhost_dev_stop(&s->dev, vdev);
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vhost_dev_disable_notifiers(&s->dev, vdev);
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static uint32_t vhost_scsi_get_features(VirtIODevice *vdev,
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VHostSCSI *s = VHOST_SCSI(vdev);
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/* Clear features not supported by host kernel. */
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if (!(s->dev.features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY))) {
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features &= ~(1 << VIRTIO_F_NOTIFY_ON_EMPTY);
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if (!(s->dev.features & (1 << VIRTIO_RING_F_INDIRECT_DESC))) {
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features &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
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if (!(s->dev.features & (1 << VIRTIO_RING_F_EVENT_IDX))) {
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features &= ~(1 << VIRTIO_RING_F_EVENT_IDX);
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if (!(s->dev.features & (1 << VIRTIO_SCSI_F_HOTPLUG))) {
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features &= ~(1 << VIRTIO_SCSI_F_HOTPLUG);
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static void vhost_scsi_set_config(VirtIODevice *vdev,
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const uint8_t *config)
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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) ldl_raw(&scsiconf->sense_size) != vs->sense_size ||
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(uint32_t) ldl_raw(&scsiconf->cdb_size) != vs->cdb_size) {
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error_report("vhost-scsi does not support changing the sense data and CDB sizes");
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static void vhost_scsi_set_status(VirtIODevice *vdev, uint8_t val)
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VHostSCSI *s = (VHostSCSI *)vdev;
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bool start = (val & VIRTIO_CONFIG_S_DRIVER_OK);
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if (s->dev.started == start) {
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ret = vhost_scsi_start(s);
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error_report("virtio-scsi: unable to start vhost: %s\n",
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/* There is no userspace virtio-scsi fallback so exit */
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static int vhost_scsi_init(VirtIODevice *vdev)
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VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
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VHostSCSI *s = VHOST_SCSI(vdev);
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if (!vs->conf.wwpn) {
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error_report("vhost-scsi: missing wwpn\n");
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if (vs->conf.vhostfd) {
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vhostfd = monitor_handle_fd_param(cur_mon, vs->conf.vhostfd);
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error_report("vhost-scsi: unable to parse vhostfd\n");
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ret = virtio_scsi_common_init(vs);
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s->dev.nvqs = VHOST_SCSI_VQ_NUM_FIXED + vs->conf.num_queues;
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s->dev.vqs = g_new(struct vhost_virtqueue, s->dev.nvqs);
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ret = vhost_dev_init(&s->dev, vhostfd, "/dev/vhost-scsi", true);
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error_report("vhost-scsi: vhost initialization failed: %s\n",
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s->dev.backend_features = 0;
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error_setg(&s->migration_blocker,
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"vhost-scsi does not support migration");
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migrate_add_blocker(s->migration_blocker);
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static int vhost_scsi_exit(DeviceState *qdev)
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VirtIODevice *vdev = VIRTIO_DEVICE(qdev);
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VHostSCSI *s = VHOST_SCSI(qdev);
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VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(qdev);
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migrate_del_blocker(s->migration_blocker);
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error_free(s->migration_blocker);
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/* This will stop vhost backend. */
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vhost_scsi_set_status(vdev, 0);
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return virtio_scsi_common_exit(vs);
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static Property vhost_scsi_properties[] = {
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DEFINE_VHOST_SCSI_PROPERTIES(VHostSCSI, parent_obj.conf),
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DEFINE_PROP_END_OF_LIST(),
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static void vhost_scsi_class_init(ObjectClass *klass, void *data)
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DeviceClass *dc = DEVICE_CLASS(klass);
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VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
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dc->exit = vhost_scsi_exit;
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dc->props = vhost_scsi_properties;
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set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
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vdc->init = vhost_scsi_init;
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vdc->get_features = vhost_scsi_get_features;
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vdc->set_config = vhost_scsi_set_config;
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vdc->set_status = vhost_scsi_set_status;
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static const TypeInfo vhost_scsi_info = {
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.name = TYPE_VHOST_SCSI,
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.parent = TYPE_VIRTIO_SCSI_COMMON,
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.instance_size = sizeof(VHostSCSI),
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.class_init = vhost_scsi_class_init,
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static void virtio_register_types(void)
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type_register_static(&vhost_scsi_info);
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type_init(virtio_register_types)