--- /dev/null
+/*
+ * 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/error-report.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"
+#include "hw/fw-path-provider.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", 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", ret);
+ }
+ }
+ assert(ret >= 0);
+
+ vhost_scsi_clear_endpoint(s);
+ vhost_dev_stop(&s->dev, vdev);
+ vhost_dev_disable_notifiers(&s->dev, vdev);
+}
+
+static uint64_t vhost_scsi_get_features(VirtIODevice *vdev,
+ uint64_t features,
+ Error **errp)
+{
+ 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",
+ 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_fd_param(cur_mon, vs->conf.vhostfd, &err);
+ if (vhostfd == -1) {
+ error_setg(errp, "vhost-scsi: unable to parse vhostfd: %s",
+ error_get_pretty(err));
+ error_free(err);
+ 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);
+ if (ret < 0) {
+ error_setg(errp, "vhost-scsi: vhost initialization failed: %s",
+ strerror(-ret));
+ return;
+ }
+
+ /* At present, channel and lun both are 0 for bootable vhost-scsi disk */
+ s->channel = 0;
+ s->lun = 0;
+ /* Note: we can also get the minimum tpgt from kernel */
+ s->target = vs->conf.boot_tpgt;
+
+ 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);
+}
+
+/*
+ * Implementation of an interface to adjust firmware path
+ * for the bootindex property handling.
+ */
+static char *vhost_scsi_get_fw_dev_path(FWPathProvider *p, BusState *bus,
+ DeviceState *dev)
+{
+ VHostSCSI *s = VHOST_SCSI(dev);
+ /* format: channel@channel/vhost-scsi@target,lun */
+ return g_strdup_printf("channel@%x/%s@%x,%x", s->channel,
+ qdev_fw_name(dev), s->target, s->lun);
+}
+
+static Property vhost_scsi_properties[] = {
+ DEFINE_PROP_STRING("vhostfd", VHostSCSI, parent_obj.conf.vhostfd),
+ DEFINE_PROP_STRING("wwpn", VHostSCSI, parent_obj.conf.wwpn),
+ DEFINE_PROP_UINT32("boot_tpgt", VHostSCSI, parent_obj.conf.boot_tpgt, 0),
+ DEFINE_PROP_UINT32("num_queues", VHostSCSI, parent_obj.conf.num_queues, 1),
+ DEFINE_PROP_UINT32("max_sectors", VHostSCSI, parent_obj.conf.max_sectors,
+ 0xFFFF),
+ DEFINE_PROP_UINT32("cmd_per_lun", VHostSCSI, parent_obj.conf.cmd_per_lun,
+ 128),
+ 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);
+ FWPathProviderClass *fwc = FW_PATH_PROVIDER_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;
+ fwc->get_dev_path = vhost_scsi_get_fw_dev_path;
+}
+
+static void vhost_scsi_instance_init(Object *obj)
+{
+ VHostSCSI *dev = VHOST_SCSI(obj);
+
+ device_add_bootindex_property(obj, &dev->bootindex, "bootindex", NULL,
+ DEVICE(dev), NULL);
+}
+
+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,
+ .instance_init = vhost_scsi_instance_init,
+ .interfaces = (InterfaceInfo[]) {
+ { TYPE_FW_PATH_PROVIDER },
+ { }
+ },
+};
+
+static void virtio_register_types(void)
+{
+ type_register_static(&vhost_scsi_info);
+}
+
+type_init(virtio_register_types)
Code Review / kvmfornfv.git / blobdiff