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+/*
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+ * vhost-user-scsi host device
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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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+
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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 "qemu/typedefs.h"
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+#include "qom/object.h"
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+#include "hw/fw-path-provider.h"
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+#include "hw/qdev-core.h"
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+#include "hw/virtio/vhost.h"
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+#include "hw/virtio/vhost-backend.h"
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+#include "hw/virtio/vhost-user-scsi.h"
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+#include "hw/virtio/virtio.h"
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+#include "hw/virtio/virtio-access.h"
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+#include "chardev/char-fe.h"
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+
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+/* Features supported by the host application */
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+static const int user_feature_bits[] = {
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+ VIRTIO_F_NOTIFY_ON_EMPTY,
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+ VIRTIO_RING_F_INDIRECT_DESC,
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+ VIRTIO_RING_F_EVENT_IDX,
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+ VIRTIO_SCSI_F_HOTPLUG,
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+ VHOST_INVALID_FEATURE_BIT
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+};
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+
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+static void vhost_user_scsi_set_status(VirtIODevice *vdev, uint8_t status)
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+{
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+ VHostUserSCSI *s = (VHostUserSCSI *)vdev;
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+ VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
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+ bool start = (status & VIRTIO_CONFIG_S_DRIVER_OK) && vdev->vm_running;
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+
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+ if (vsc->dev.started == start) {
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+ return;
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+ }
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+
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+ if (start) {
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+ int ret;
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+
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+ ret = vhost_scsi_common_start(vsc);
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+ if (ret < 0) {
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+ error_report("unable to start vhost-user-scsi: %s", strerror(-ret));
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+ exit(1);
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+ }
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+ } else {
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+ vhost_scsi_common_stop(vsc);
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+ }
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+}
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+
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+static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq)
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+{
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+}
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+
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+static void vhost_user_scsi_realize(DeviceState *dev, Error **errp)
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+{
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+ VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
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+ VHostUserSCSI *s = VHOST_USER_SCSI(dev);
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+ VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
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+ Error *err = NULL;
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+ int ret;
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+
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+ if (!vs->conf.chardev.chr) {
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+ error_setg(errp, "vhost-user-scsi: missing chardev");
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+ return;
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+ }
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+
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+ virtio_scsi_common_realize(dev, vhost_dummy_handle_output,
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+ vhost_dummy_handle_output,
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+ vhost_dummy_handle_output, &err);
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+ if (err != NULL) {
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+ error_propagate(errp, err);
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+ return;
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+ }
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+
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+ vsc->dev.nvqs = 2 + vs->conf.num_queues;
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+ vsc->dev.vqs = g_new(struct vhost_virtqueue, vsc->dev.nvqs);
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+ vsc->dev.vq_index = 0;
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+ vsc->dev.backend_features = 0;
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+
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+ ret = vhost_dev_init(&vsc->dev, (void *)&vs->conf.chardev,
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+ VHOST_BACKEND_TYPE_USER, 0);
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+ if (ret < 0) {
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+ error_setg(errp, "vhost-user-scsi: vhost initialization failed: %s",
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+ strerror(-ret));
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+ return;
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+ }
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+
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+ /* Channel and lun both are 0 for bootable vhost-user-scsi disk */
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+ vsc->channel = 0;
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+ vsc->lun = 0;
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+ vsc->target = vs->conf.boot_tpgt;
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+}
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+
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+static void vhost_user_scsi_unrealize(DeviceState *dev, Error **errp)
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+{
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+ VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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+ VHostUserSCSI *s = VHOST_USER_SCSI(dev);
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+ VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
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+
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+ /* This will stop the vhost backend. */
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+ vhost_user_scsi_set_status(vdev, 0);
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+
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+ vhost_dev_cleanup(&vsc->dev);
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+ g_free(vsc->dev.vqs);
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+
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+ virtio_scsi_common_unrealize(dev, errp);
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+}
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+
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+static uint64_t vhost_user_scsi_get_features(VirtIODevice *vdev,
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+ uint64_t features, Error **errp)
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+{
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+ VHostUserSCSI *s = VHOST_USER_SCSI(vdev);
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+
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+ /* Turn on predefined features supported by this device */
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+ features |= s->host_features;
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+
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+ return vhost_scsi_common_get_features(vdev, features, errp);
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+}
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+
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+static Property vhost_user_scsi_properties[] = {
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+ DEFINE_PROP_CHR("chardev", VirtIOSCSICommon, conf.chardev),
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+ DEFINE_PROP_UINT32("boot_tpgt", VirtIOSCSICommon, conf.boot_tpgt, 0),
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+ DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues, 1),
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+ DEFINE_PROP_UINT32("max_sectors", VirtIOSCSICommon, conf.max_sectors,
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+ 0xFFFF),
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+ DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSICommon, conf.cmd_per_lun, 128),
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+ DEFINE_PROP_BIT64("hotplug", VHostUserSCSI, host_features,
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+ VIRTIO_SCSI_F_HOTPLUG,
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+ true),
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+ DEFINE_PROP_BIT64("param_change", VHostUserSCSI, host_features,
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+ VIRTIO_SCSI_F_CHANGE,
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+ true),
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+ DEFINE_PROP_END_OF_LIST(),
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+};
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+
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+static const VMStateDescription vmstate_vhost_scsi = {
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+ .name = "virtio-scsi",
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+ .minimum_version_id = 1,
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+ .version_id = 1,
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+ .fields = (VMStateField[]) {
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+ VMSTATE_VIRTIO_DEVICE,
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+ VMSTATE_END_OF_LIST()
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+ },
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+};
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+
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+static void vhost_user_scsi_class_init(ObjectClass *klass, void *data)
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+{
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+ DeviceClass *dc = DEVICE_CLASS(klass);
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+ VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
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+ FWPathProviderClass *fwc = FW_PATH_PROVIDER_CLASS(klass);
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+
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+ dc->props = vhost_user_scsi_properties;
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+ dc->vmsd = &vmstate_vhost_scsi;
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+ set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
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+ vdc->realize = vhost_user_scsi_realize;
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+ vdc->unrealize = vhost_user_scsi_unrealize;
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+ vdc->get_features = vhost_user_scsi_get_features;
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+ vdc->set_config = vhost_scsi_common_set_config;
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+ vdc->set_status = vhost_user_scsi_set_status;
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+ fwc->get_dev_path = vhost_scsi_common_get_fw_dev_path;
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+}
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+
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+static void vhost_user_scsi_instance_init(Object *obj)
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+{
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+ VHostSCSICommon *vsc = VHOST_SCSI_COMMON(obj);
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+
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+ vsc->feature_bits = user_feature_bits;
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+
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+ /* Add the bootindex property for this object */
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+ device_add_bootindex_property(obj, &vsc->bootindex, "bootindex", NULL,
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+ DEVICE(vsc), NULL);
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+}
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+
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+static const TypeInfo vhost_user_scsi_info = {
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+ .name = TYPE_VHOST_USER_SCSI,
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+ .parent = TYPE_VHOST_SCSI_COMMON,
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+ .instance_size = sizeof(VHostUserSCSI),
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+ .class_init = vhost_user_scsi_class_init,
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+ .instance_init = vhost_user_scsi_instance_init,
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+ .interfaces = (InterfaceInfo[]) {
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+ { TYPE_FW_PATH_PROVIDER },
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+ { }
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+ },
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+};
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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_user_scsi_info);
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+}
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+
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+type_init(virtio_register_types)
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Felipe Franciosi