f12c1ebddf
This commit introduces a vhost-user device for SCSI. This is based
on the existing vhost-scsi implementation, but done over vhost-user
instead. It also uses a chardev to connect to the backend. Unlike
vhost-scsi (today), VMs using vhost-user-scsi can be live migrated.
To use it, start Qemu with a command line equivalent to:
qemu-system-x86_64 \
-chardev socket,id=vus0,path=/tmp/vus.sock \
-device vhost-user-scsi-pci,chardev=vus0,bus=pci.0,addr=...
A separate commit presents a sample application linked with libiscsi to
provide a backend for vhost-user-scsi.
Signed-off-by: Felipe Franciosi <felipe@nutanix.com>
Message-Id: <1488479153-21203-4-git-send-email-felipe@nutanix.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
143 lines
4.1 KiB
C
143 lines
4.1 KiB
C
/*
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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 "migration/migration.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)
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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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if (!k->set_guest_notifiers) {
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error_report("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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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_report("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_start(&vsc->dev, vdev);
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if (ret < 0) {
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error_report("Error start 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);
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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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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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