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qemu/hw/scsi/vhost-scsi.c

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/*
* vhost_scsi host device
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
*
* Changes for QEMU mainline + tcm_vhost kernel upstream:
* Nicholas Bellinger <nab@risingtidesystems.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2 or later.
* See the COPYING.LIB file in the top-level directory.
*
*/
#include <sys/ioctl.h>
#include "config.h"
#include "qemu/queue.h"
#include "monitor/monitor.h"
#include "migration/migration.h"
#include "hw/virtio/vhost-scsi.h"
#include "hw/virtio/vhost.h"
#include "hw/virtio/virtio-scsi.h"
#include "hw/virtio/virtio-bus.h"
#include "hw/virtio/virtio-access.h"
/* Features supported by host kernel. */
static const int kernel_feature_bits[] = {
VIRTIO_F_NOTIFY_ON_EMPTY,
VIRTIO_RING_F_INDIRECT_DESC,
VIRTIO_RING_F_EVENT_IDX,
VIRTIO_SCSI_F_HOTPLUG,
VHOST_INVALID_FEATURE_BIT
};
static int vhost_scsi_set_endpoint(VHostSCSI *s)
{
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
const VhostOps *vhost_ops = s->dev.vhost_ops;
struct vhost_scsi_target backend;
int ret;
memset(&backend, 0, sizeof(backend));
pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->conf.wwpn);
ret = vhost_ops->vhost_call(&s->dev, VHOST_SCSI_SET_ENDPOINT, &backend);
if (ret < 0) {
return -errno;
}
return 0;
}
static void vhost_scsi_clear_endpoint(VHostSCSI *s)
{
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
struct vhost_scsi_target backend;
const VhostOps *vhost_ops = s->dev.vhost_ops;
memset(&backend, 0, sizeof(backend));
pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->conf.wwpn);
vhost_ops->vhost_call(&s->dev, VHOST_SCSI_CLEAR_ENDPOINT, &backend);
}
static int vhost_scsi_start(VHostSCSI *s)
{
int ret, abi_version, i;
VirtIODevice *vdev = VIRTIO_DEVICE(s);
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
const VhostOps *vhost_ops = s->dev.vhost_ops;
if (!k->set_guest_notifiers) {
error_report("binding does not support guest notifiers");
return -ENOSYS;
}
ret = vhost_ops->vhost_call(&s->dev,
VHOST_SCSI_GET_ABI_VERSION, &abi_version);
if (ret < 0) {
return -errno;
}
if (abi_version > VHOST_SCSI_ABI_VERSION) {
error_report("vhost-scsi: The running tcm_vhost kernel abi_version:"
" %d is greater than vhost_scsi userspace supports: %d, please"
" upgrade your version of QEMU\n", abi_version,
VHOST_SCSI_ABI_VERSION);
return -ENOSYS;
}
ret = vhost_dev_enable_notifiers(&s->dev, vdev);
if (ret < 0) {
return ret;
}
s->dev.acked_features = vdev->guest_features;
ret = vhost_dev_start(&s->dev, vdev);
if (ret < 0) {
error_report("Error start vhost dev");
goto err_notifiers;
}
ret = vhost_scsi_set_endpoint(s);
if (ret < 0) {
error_report("Error set vhost-scsi endpoint");
goto err_vhost_stop;
}
ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, true);
if (ret < 0) {
error_report("Error binding guest notifier");
goto err_endpoint;
}
/* guest_notifier_mask/pending not used yet, so just unmask
* everything here. virtio-pci will do the right thing by
* enabling/disabling irqfd.
*/
for (i = 0; i < s->dev.nvqs; i++) {
vhost_virtqueue_mask(&s->dev, vdev, i, false);
}
return ret;
err_endpoint:
vhost_scsi_clear_endpoint(s);
err_vhost_stop:
vhost_dev_stop(&s->dev, vdev);
err_notifiers:
vhost_dev_disable_notifiers(&s->dev, vdev);
return ret;
}
static void vhost_scsi_stop(VHostSCSI *s)
{
VirtIODevice *vdev = VIRTIO_DEVICE(s);
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
int ret = 0;
if (k->set_guest_notifiers) {
ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, false);
if (ret < 0) {
error_report("vhost guest notifier cleanup failed: %d\n", ret);
}
}
assert(ret >= 0);
vhost_scsi_clear_endpoint(s);
vhost_dev_stop(&s->dev, vdev);
vhost_dev_disable_notifiers(&s->dev, vdev);
}
static uint32_t vhost_scsi_get_features(VirtIODevice *vdev,
uint32_t features)
{
VHostSCSI *s = VHOST_SCSI(vdev);
return vhost_get_features(&s->dev, kernel_feature_bits, features);
}
static void vhost_scsi_set_config(VirtIODevice *vdev,
const uint8_t *config)
{
VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
if ((uint32_t) virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size ||
(uint32_t) virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) {
error_report("vhost-scsi does not support changing the sense data and CDB sizes");
exit(1);
}
}
static void vhost_scsi_set_status(VirtIODevice *vdev, uint8_t val)
{
VHostSCSI *s = (VHostSCSI *)vdev;
bool start = (val & VIRTIO_CONFIG_S_DRIVER_OK);
if (s->dev.started == start) {
return;
}
if (start) {
int ret;
ret = vhost_scsi_start(s);
if (ret < 0) {
error_report("virtio-scsi: unable to start vhost: %s\n",
strerror(-ret));
/* There is no userspace virtio-scsi fallback so exit */
exit(1);
}
} else {
vhost_scsi_stop(s);
}
}
static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
}
static void vhost_scsi_realize(DeviceState *dev, Error **errp)
{
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
VHostSCSI *s = VHOST_SCSI(dev);
Error *err = NULL;
int vhostfd = -1;
int ret;
if (!vs->conf.wwpn) {
error_setg(errp, "vhost-scsi: missing wwpn");
return;
}
if (vs->conf.vhostfd) {
vhostfd = monitor_handle_fd_param(cur_mon, vs->conf.vhostfd);
if (vhostfd == -1) {
error_setg(errp, "vhost-scsi: unable to parse vhostfd");
return;
}
} else {
vhostfd = open("/dev/vhost-scsi", O_RDWR);
if (vhostfd < 0) {
error_setg(errp, "vhost-scsi: open vhost char device failed: %s",
strerror(errno));
return;
}
}
virtio_scsi_common_realize(dev, &err, vhost_dummy_handle_output,
vhost_dummy_handle_output,
vhost_dummy_handle_output);
if (err != NULL) {
error_propagate(errp, err);
close(vhostfd);
return;
}
s->dev.nvqs = VHOST_SCSI_VQ_NUM_FIXED + vs->conf.num_queues;
s->dev.vqs = g_new(struct vhost_virtqueue, s->dev.nvqs);
s->dev.vq_index = 0;
s->dev.backend_features = 0;
ret = vhost_dev_init(&s->dev, (void *)(uintptr_t)vhostfd,
VHOST_BACKEND_TYPE_KERNEL, true);
if (ret < 0) {
error_setg(errp, "vhost-scsi: vhost initialization failed: %s",
strerror(-ret));
return;
}
error_setg(&s->migration_blocker,
"vhost-scsi does not support migration");
migrate_add_blocker(s->migration_blocker);
}
static void vhost_scsi_unrealize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostSCSI *s = VHOST_SCSI(dev);
migrate_del_blocker(s->migration_blocker);
error_free(s->migration_blocker);
/* This will stop vhost backend. */
vhost_scsi_set_status(vdev, 0);
g_free(s->dev.vqs);
virtio_scsi_common_unrealize(dev, errp);
}
static Property vhost_scsi_properties[] = {
DEFINE_VHOST_SCSI_PROPERTIES(VHostSCSI, parent_obj.conf),
DEFINE_PROP_END_OF_LIST(),
};
static void vhost_scsi_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
dc->props = vhost_scsi_properties;
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
vdc->realize = vhost_scsi_realize;
vdc->unrealize = vhost_scsi_unrealize;
vdc->get_features = vhost_scsi_get_features;
vdc->set_config = vhost_scsi_set_config;
vdc->set_status = vhost_scsi_set_status;
}
static const TypeInfo vhost_scsi_info = {
.name = TYPE_VHOST_SCSI,
.parent = TYPE_VIRTIO_SCSI_COMMON,
.instance_size = sizeof(VHostSCSI),
.class_init = vhost_scsi_class_init,
};
static void virtio_register_types(void)
{
type_register_static(&vhost_scsi_info);
}
type_init(virtio_register_types)
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