diff options
Diffstat (limited to 'hw/scsi/vhost-scsi.c')
| -rw-r--r-- | hw/scsi/vhost-scsi.c | 331 |
1 files changed, 331 insertions, 0 deletions
diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c new file mode 100644 index 000000000..039caf261 --- /dev/null +++ b/hw/scsi/vhost-scsi.c @@ -0,0 +1,331 @@ +/* + * 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 "qemu/osdep.h" +#include <linux/vhost.h> +#include <sys/ioctl.h> +#include "qapi/error.h" +#include "qemu/error-report.h" +#include "qemu/module.h" +#include "monitor/monitor.h" +#include "migration/blocker.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 "hw/qdev-properties.h" +#include "qemu/cutils.h" +#include "sysemu/sysemu.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); + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); + const VhostOps *vhost_ops = vsc->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(&vsc->dev, &backend); + if (ret < 0) { + return -errno; + } + return 0; +} + +static void vhost_scsi_clear_endpoint(VHostSCSI *s) +{ + VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); + struct vhost_scsi_target backend; + const VhostOps *vhost_ops = vsc->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(&vsc->dev, &backend); +} + +static int vhost_scsi_start(VHostSCSI *s) +{ + int ret, abi_version; + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); + const VhostOps *vhost_ops = vsc->dev.vhost_ops; + + ret = vhost_ops->vhost_scsi_get_abi_version(&vsc->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_scsi_common_start(vsc); + if (ret < 0) { + return ret; + } + + ret = vhost_scsi_set_endpoint(s); + if (ret < 0) { + error_report("Error setting vhost-scsi endpoint"); + vhost_scsi_common_stop(vsc); + } + + return ret; +} + +static void vhost_scsi_stop(VHostSCSI *s) +{ + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); + + vhost_scsi_clear_endpoint(s); + vhost_scsi_common_stop(vsc); +} + +static void vhost_scsi_set_status(VirtIODevice *vdev, uint8_t val) +{ + VHostSCSI *s = VHOST_SCSI(vdev); + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); + bool start = (val & VIRTIO_CONFIG_S_DRIVER_OK); + + if (!vdev->vm_running) { + start = false; + } + + if (vsc->dev.started == start) { + return; + } + + if (start) { + int ret; + + ret = vhost_scsi_start(s); + if (ret < 0) { + error_report("unable to start vhost-scsi: %s", strerror(-ret)); + exit(1); + } + } else { + vhost_scsi_stop(s); + } +} + +static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq) +{ +} + +static int vhost_scsi_pre_save(void *opaque) +{ + VHostSCSICommon *vsc = opaque; + + /* At this point, backend must be stopped, otherwise + * it might keep writing to memory. */ + assert(!vsc->dev.started); + + return 0; +} + +static const VMStateDescription vmstate_virtio_vhost_scsi = { + .name = "virtio-vhost_scsi", + .minimum_version_id = 1, + .version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_VIRTIO_DEVICE, + VMSTATE_END_OF_LIST() + }, + .pre_save = vhost_scsi_pre_save, +}; + +static void vhost_scsi_realize(DeviceState *dev, Error **errp) +{ + VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(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(monitor_cur(), vs->conf.vhostfd, errp); + if (vhostfd == -1) { + error_prepend(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, + vhost_dummy_handle_output, + vhost_dummy_handle_output, + vhost_dummy_handle_output, + &err); + if (err != NULL) { + error_propagate(errp, err); + goto close_fd; + } + + if (!vsc->migratable) { + error_setg(&vsc->migration_blocker, + "vhost-scsi does not support migration in all cases. " + "When external environment supports it (Orchestrator migrates " + "target SCSI device state or use shared storage over network), " + "set 'migratable' property to true to enable migration."); + if (migrate_add_blocker(vsc->migration_blocker, errp) < 0) { + goto free_virtio; + } + } + + vsc->dev.nvqs = VHOST_SCSI_VQ_NUM_FIXED + vs->conf.num_queues; + vsc->dev.vqs = g_new0(struct vhost_virtqueue, vsc->dev.nvqs); + vsc->dev.vq_index = 0; + vsc->dev.backend_features = 0; + + ret = vhost_dev_init(&vsc->dev, (void *)(uintptr_t)vhostfd, + VHOST_BACKEND_TYPE_KERNEL, 0, errp); + if (ret < 0) { + goto free_vqs; + } + + /* At present, channel and lun both are 0 for bootable vhost-scsi disk */ + vsc->channel = 0; + vsc->lun = 0; + /* Note: we can also get the minimum tpgt from kernel */ + vsc->target = vs->conf.boot_tpgt; + + return; + + free_vqs: + g_free(vsc->dev.vqs); + if (!vsc->migratable) { + migrate_del_blocker(vsc->migration_blocker); + } + free_virtio: + error_free(vsc->migration_blocker); + virtio_scsi_common_unrealize(dev); + close_fd: + close(vhostfd); + return; +} + +static void vhost_scsi_unrealize(DeviceState *dev) +{ + VirtIODevice *vdev = VIRTIO_DEVICE(dev); + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev); + struct vhost_virtqueue *vqs = vsc->dev.vqs; + + if (!vsc->migratable) { + migrate_del_blocker(vsc->migration_blocker); + error_free(vsc->migration_blocker); + } + + /* This will stop vhost backend. */ + vhost_scsi_set_status(vdev, 0); + + vhost_dev_cleanup(&vsc->dev); + g_free(vqs); + + virtio_scsi_common_unrealize(dev); +} + +static Property vhost_scsi_properties[] = { + DEFINE_PROP_STRING("vhostfd", VirtIOSCSICommon, conf.vhostfd), + DEFINE_PROP_STRING("wwpn", VirtIOSCSICommon, conf.wwpn), + DEFINE_PROP_UINT32("boot_tpgt", VirtIOSCSICommon, conf.boot_tpgt, 0), + DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues, + VIRTIO_SCSI_AUTO_NUM_QUEUES), + DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSICommon, conf.virtqueue_size, + 128), + DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSICommon, conf.seg_max_adjust, + true), + DEFINE_PROP_UINT32("max_sectors", VirtIOSCSICommon, conf.max_sectors, + 0xFFFF), + DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSICommon, conf.cmd_per_lun, 128), + DEFINE_PROP_BIT64("t10_pi", VHostSCSICommon, host_features, + VIRTIO_SCSI_F_T10_PI, + false), + DEFINE_PROP_BOOL("migratable", VHostSCSICommon, migratable, false), + 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); + + device_class_set_props(dc, vhost_scsi_properties); + dc->vmsd = &vmstate_virtio_vhost_scsi; + set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); + vdc->realize = vhost_scsi_realize; + vdc->unrealize = vhost_scsi_unrealize; + vdc->get_features = vhost_scsi_common_get_features; + vdc->set_config = vhost_scsi_common_set_config; + vdc->set_status = vhost_scsi_set_status; + fwc->get_dev_path = vhost_scsi_common_get_fw_dev_path; +} + +static void vhost_scsi_instance_init(Object *obj) +{ + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(obj); + + vsc->feature_bits = kernel_feature_bits; + + device_add_bootindex_property(obj, &vsc->bootindex, "bootindex", NULL, + DEVICE(vsc)); +} + +static const TypeInfo vhost_scsi_info = { + .name = TYPE_VHOST_SCSI, + .parent = TYPE_VHOST_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) |