diff options
Diffstat (limited to 'src/hw/scsi/vhost-scsi.c')
| -rw-r--r-- | src/hw/scsi/vhost-scsi.c | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/src/hw/scsi/vhost-scsi.c b/src/hw/scsi/vhost-scsi.c new file mode 100644 index 0000000..00cdac6 --- /dev/null +++ b/src/hw/scsi/vhost-scsi.c @@ -0,0 +1,352 @@ +/* + * 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" +#include "linux/vhost.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_scsi_set_endpoint(&s->dev, &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_scsi_clear_endpoint(&s->dev, &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_scsi_get_abi_version(&s->dev, &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, s->dev.vq_index + 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); + + vhost_dev_cleanup(&s->dev); + 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) |
