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620 lines
17 KiB
C
620 lines
17 KiB
C
/*
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* vhost-user-blk host device
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*
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* Copyright(C) 2017 Intel Corporation.
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*
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* Authors:
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* Changpeng Liu <changpeng.liu@intel.com>
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*
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* Largely based on the "vhost-user-scsi.c" and "vhost-scsi.c" implemented by:
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* Felipe Franciosi <felipe@nutanix.com>
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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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#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/cutils.h"
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#include "hw/qdev-core.h"
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#include "hw/qdev-properties.h"
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#include "hw/qdev-properties-system.h"
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#include "hw/virtio/virtio-blk-common.h"
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#include "hw/virtio/vhost.h"
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#include "hw/virtio/vhost-user-blk.h"
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#include "hw/virtio/virtio.h"
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#include "hw/virtio/virtio-bus.h"
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#include "hw/virtio/virtio-access.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/runstate.h"
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static const int user_feature_bits[] = {
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VIRTIO_BLK_F_SIZE_MAX,
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VIRTIO_BLK_F_SEG_MAX,
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VIRTIO_BLK_F_GEOMETRY,
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VIRTIO_BLK_F_BLK_SIZE,
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VIRTIO_BLK_F_TOPOLOGY,
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VIRTIO_BLK_F_MQ,
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VIRTIO_BLK_F_RO,
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VIRTIO_BLK_F_FLUSH,
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VIRTIO_BLK_F_CONFIG_WCE,
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VIRTIO_BLK_F_DISCARD,
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VIRTIO_BLK_F_WRITE_ZEROES,
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VIRTIO_F_VERSION_1,
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VIRTIO_RING_F_INDIRECT_DESC,
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VIRTIO_RING_F_EVENT_IDX,
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VIRTIO_F_NOTIFY_ON_EMPTY,
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VIRTIO_F_RING_PACKED,
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VIRTIO_F_IOMMU_PLATFORM,
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VIRTIO_F_RING_RESET,
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VIRTIO_F_IN_ORDER,
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VIRTIO_F_NOTIFICATION_DATA,
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VHOST_INVALID_FEATURE_BIT
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};
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static void vhost_user_blk_event(void *opaque, QEMUChrEvent event);
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static void vhost_user_blk_update_config(VirtIODevice *vdev, uint8_t *config)
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{
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VHostUserBlk *s = VHOST_USER_BLK(vdev);
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/* Our num_queues overrides the device backend */
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virtio_stw_p(vdev, &s->blkcfg.num_queues, s->num_queues);
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memcpy(config, &s->blkcfg, vdev->config_len);
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}
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static void vhost_user_blk_set_config(VirtIODevice *vdev, const uint8_t *config)
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{
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VHostUserBlk *s = VHOST_USER_BLK(vdev);
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struct virtio_blk_config *blkcfg = (struct virtio_blk_config *)config;
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int ret;
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if (blkcfg->wce == s->blkcfg.wce) {
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return;
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}
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ret = vhost_dev_set_config(&s->dev, &blkcfg->wce,
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offsetof(struct virtio_blk_config, wce),
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sizeof(blkcfg->wce),
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VHOST_SET_CONFIG_TYPE_FRONTEND);
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if (ret) {
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error_report("set device config space failed");
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return;
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}
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s->blkcfg.wce = blkcfg->wce;
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}
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static int vhost_user_blk_sync_config(DeviceState *dev, Error **errp)
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{
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int ret;
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VHostUserBlk *s = VHOST_USER_BLK(vdev);
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ret = vhost_dev_get_config(&s->dev, (uint8_t *)&s->blkcfg,
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vdev->config_len, errp);
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if (ret < 0) {
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return ret;
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}
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memcpy(vdev->config, &s->blkcfg, vdev->config_len);
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virtio_notify_config(vdev);
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return 0;
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}
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static int vhost_user_blk_handle_config_change(struct vhost_dev *dev)
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{
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int ret;
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Error *local_err = NULL;
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if (!dev->started) {
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return 0;
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}
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ret = vhost_user_blk_sync_config(DEVICE(dev->vdev), &local_err);
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if (ret < 0) {
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error_report_err(local_err);
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return ret;
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}
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return 0;
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}
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const VhostDevConfigOps blk_ops = {
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.vhost_dev_config_notifier = vhost_user_blk_handle_config_change,
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};
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static int vhost_user_blk_start(VirtIODevice *vdev, Error **errp)
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{
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VHostUserBlk *s = VHOST_USER_BLK(vdev);
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BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
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VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
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int i, ret;
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if (!k->set_guest_notifiers) {
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error_setg(errp, "binding does not support guest notifiers");
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return -ENOSYS;
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}
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ret = vhost_dev_enable_notifiers(&s->dev, vdev);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Error enabling host notifiers");
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return ret;
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}
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ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, true);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Error binding guest notifier");
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goto err_host_notifiers;
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}
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s->dev.acked_features = vdev->guest_features;
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ret = vhost_dev_prepare_inflight(&s->dev, vdev);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Error setting inflight format");
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goto err_guest_notifiers;
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}
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if (!s->inflight->addr) {
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ret = vhost_dev_get_inflight(&s->dev, s->queue_size, s->inflight);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Error getting inflight");
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goto err_guest_notifiers;
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}
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}
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ret = vhost_dev_set_inflight(&s->dev, s->inflight);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Error setting inflight");
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goto err_guest_notifiers;
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}
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/* guest_notifier_mask/pending not used yet, so just unmask
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* everything here. virtio-pci will do the right thing by
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* enabling/disabling irqfd.
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*/
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for (i = 0; i < s->dev.nvqs; i++) {
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vhost_virtqueue_mask(&s->dev, vdev, i, false);
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}
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s->dev.vq_index_end = s->dev.nvqs;
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ret = vhost_dev_start(&s->dev, vdev, true);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Error starting vhost");
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goto err_guest_notifiers;
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}
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s->started_vu = true;
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return ret;
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err_guest_notifiers:
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for (i = 0; i < s->dev.nvqs; i++) {
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vhost_virtqueue_mask(&s->dev, vdev, i, true);
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}
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k->set_guest_notifiers(qbus->parent, s->dev.nvqs, false);
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err_host_notifiers:
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vhost_dev_disable_notifiers(&s->dev, vdev);
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return ret;
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}
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static void vhost_user_blk_stop(VirtIODevice *vdev)
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{
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VHostUserBlk *s = VHOST_USER_BLK(vdev);
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BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
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VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
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int ret;
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if (!s->started_vu) {
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return;
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}
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s->started_vu = false;
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if (!k->set_guest_notifiers) {
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return;
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}
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vhost_dev_stop(&s->dev, vdev, true);
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ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, false);
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if (ret < 0) {
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error_report("vhost guest notifier cleanup failed: %d", ret);
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return;
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}
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vhost_dev_disable_notifiers(&s->dev, vdev);
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}
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static void vhost_user_blk_set_status(VirtIODevice *vdev, uint8_t status)
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{
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VHostUserBlk *s = VHOST_USER_BLK(vdev);
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bool should_start = virtio_device_should_start(vdev, status);
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Error *local_err = NULL;
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int ret;
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if (!s->connected) {
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return;
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}
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if (vhost_dev_is_started(&s->dev) == should_start) {
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return;
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}
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if (should_start) {
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ret = vhost_user_blk_start(vdev, &local_err);
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if (ret < 0) {
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error_reportf_err(local_err, "vhost-user-blk: vhost start failed: ");
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qemu_chr_fe_disconnect(&s->chardev);
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}
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} else {
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vhost_user_blk_stop(vdev);
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}
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}
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static uint64_t vhost_user_blk_get_features(VirtIODevice *vdev,
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uint64_t features,
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Error **errp)
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{
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VHostUserBlk *s = VHOST_USER_BLK(vdev);
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/* Turn on pre-defined features */
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virtio_add_feature(&features, VIRTIO_BLK_F_SIZE_MAX);
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virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX);
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virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY);
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virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY);
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virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE);
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virtio_add_feature(&features, VIRTIO_BLK_F_FLUSH);
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virtio_add_feature(&features, VIRTIO_BLK_F_RO);
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if (s->num_queues > 1) {
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virtio_add_feature(&features, VIRTIO_BLK_F_MQ);
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}
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return vhost_get_features(&s->dev, user_feature_bits, features);
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}
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static void vhost_user_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
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{
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VHostUserBlk *s = VHOST_USER_BLK(vdev);
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Error *local_err = NULL;
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int i, ret;
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if (!vdev->start_on_kick) {
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return;
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}
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if (!s->connected) {
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return;
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}
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if (vhost_dev_is_started(&s->dev)) {
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return;
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}
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/* Some guests kick before setting VIRTIO_CONFIG_S_DRIVER_OK so start
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* vhost here instead of waiting for .set_status().
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*/
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ret = vhost_user_blk_start(vdev, &local_err);
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if (ret < 0) {
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error_reportf_err(local_err, "vhost-user-blk: vhost start failed: ");
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qemu_chr_fe_disconnect(&s->chardev);
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return;
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}
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/* Kick right away to begin processing requests already in vring */
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for (i = 0; i < s->dev.nvqs; i++) {
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VirtQueue *kick_vq = virtio_get_queue(vdev, i);
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if (!virtio_queue_get_desc_addr(vdev, i)) {
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continue;
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}
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event_notifier_set(virtio_queue_get_host_notifier(kick_vq));
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}
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}
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static void vhost_user_blk_reset(VirtIODevice *vdev)
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{
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VHostUserBlk *s = VHOST_USER_BLK(vdev);
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vhost_dev_free_inflight(s->inflight);
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}
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static int vhost_user_blk_connect(DeviceState *dev, Error **errp)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VHostUserBlk *s = VHOST_USER_BLK(vdev);
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int ret = 0;
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if (s->connected) {
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return 0;
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}
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s->dev.num_queues = s->num_queues;
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s->dev.nvqs = s->num_queues;
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s->dev.vqs = s->vhost_vqs;
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s->dev.vq_index = 0;
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s->dev.backend_features = 0;
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vhost_dev_set_config_notifier(&s->dev, &blk_ops);
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s->vhost_user.supports_config = true;
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ret = vhost_dev_init(&s->dev, &s->vhost_user, VHOST_BACKEND_TYPE_USER, 0,
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errp);
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if (ret < 0) {
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return ret;
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}
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s->connected = true;
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/* restore vhost state */
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if (virtio_device_started(vdev, vdev->status)) {
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ret = vhost_user_blk_start(vdev, errp);
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}
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return ret;
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}
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static void vhost_user_blk_disconnect(DeviceState *dev)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VHostUserBlk *s = VHOST_USER_BLK(vdev);
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if (!s->connected) {
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goto done;
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}
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s->connected = false;
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vhost_user_blk_stop(vdev);
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vhost_dev_cleanup(&s->dev);
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done:
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/* Re-instate the event handler for new connections */
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qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, vhost_user_blk_event,
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NULL, dev, NULL, true);
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}
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static void vhost_user_blk_event(void *opaque, QEMUChrEvent event)
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{
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DeviceState *dev = opaque;
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VHostUserBlk *s = VHOST_USER_BLK(vdev);
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Error *local_err = NULL;
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switch (event) {
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case CHR_EVENT_OPENED:
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if (vhost_user_blk_connect(dev, &local_err) < 0) {
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error_report_err(local_err);
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qemu_chr_fe_disconnect(&s->chardev);
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return;
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}
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break;
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case CHR_EVENT_CLOSED:
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/* defer close until later to avoid circular close */
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vhost_user_async_close(dev, &s->chardev, &s->dev,
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vhost_user_blk_disconnect);
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break;
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case CHR_EVENT_BREAK:
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case CHR_EVENT_MUX_IN:
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case CHR_EVENT_MUX_OUT:
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/* Ignore */
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break;
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}
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}
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static int vhost_user_blk_realize_connect(VHostUserBlk *s, Error **errp)
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{
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DeviceState *dev = DEVICE(s);
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int ret;
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s->connected = false;
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ret = qemu_chr_fe_wait_connected(&s->chardev, errp);
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if (ret < 0) {
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return ret;
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}
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ret = vhost_user_blk_connect(dev, errp);
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if (ret < 0) {
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qemu_chr_fe_disconnect(&s->chardev);
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return ret;
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}
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assert(s->connected);
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ret = vhost_dev_get_config(&s->dev, (uint8_t *)&s->blkcfg,
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VIRTIO_DEVICE(s)->config_len, errp);
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if (ret < 0) {
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qemu_chr_fe_disconnect(&s->chardev);
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vhost_dev_cleanup(&s->dev);
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return ret;
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}
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return 0;
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}
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static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
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{
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ERRP_GUARD();
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VHostUserBlk *s = VHOST_USER_BLK(vdev);
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size_t config_size;
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int retries;
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int i, ret;
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if (!s->chardev.chr) {
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error_setg(errp, "chardev is mandatory");
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return;
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}
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if (s->num_queues == VHOST_USER_BLK_AUTO_NUM_QUEUES) {
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s->num_queues = 1;
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}
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if (!s->num_queues || s->num_queues > VIRTIO_QUEUE_MAX) {
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error_setg(errp, "invalid number of IO queues");
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return;
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}
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if (!s->queue_size) {
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error_setg(errp, "queue size must be non-zero");
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return;
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}
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if (s->queue_size > VIRTQUEUE_MAX_SIZE) {
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error_setg(errp, "queue size must not exceed %d",
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VIRTQUEUE_MAX_SIZE);
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return;
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}
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if (!vhost_user_init(&s->vhost_user, &s->chardev, errp)) {
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return;
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}
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config_size = virtio_get_config_size(&virtio_blk_cfg_size_params,
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vdev->host_features);
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virtio_init(vdev, VIRTIO_ID_BLOCK, config_size);
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s->virtqs = g_new(VirtQueue *, s->num_queues);
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for (i = 0; i < s->num_queues; i++) {
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s->virtqs[i] = virtio_add_queue(vdev, s->queue_size,
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vhost_user_blk_handle_output);
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}
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s->inflight = g_new0(struct vhost_inflight, 1);
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s->vhost_vqs = g_new0(struct vhost_virtqueue, s->num_queues);
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retries = VU_REALIZE_CONN_RETRIES;
|
|
assert(!*errp);
|
|
do {
|
|
if (*errp) {
|
|
error_prepend(errp, "Reconnecting after error: ");
|
|
error_report_err(*errp);
|
|
*errp = NULL;
|
|
}
|
|
ret = vhost_user_blk_realize_connect(s, errp);
|
|
} while (ret < 0 && retries--);
|
|
|
|
if (ret < 0) {
|
|
goto virtio_err;
|
|
}
|
|
|
|
/* we're fully initialized, now we can operate, so add the handler */
|
|
qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL,
|
|
vhost_user_blk_event, NULL, (void *)dev,
|
|
NULL, true);
|
|
return;
|
|
|
|
virtio_err:
|
|
g_free(s->vhost_vqs);
|
|
s->vhost_vqs = NULL;
|
|
g_free(s->inflight);
|
|
s->inflight = NULL;
|
|
for (i = 0; i < s->num_queues; i++) {
|
|
virtio_delete_queue(s->virtqs[i]);
|
|
}
|
|
g_free(s->virtqs);
|
|
virtio_cleanup(vdev);
|
|
vhost_user_cleanup(&s->vhost_user);
|
|
}
|
|
|
|
static void vhost_user_blk_device_unrealize(DeviceState *dev)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VHostUserBlk *s = VHOST_USER_BLK(dev);
|
|
int i;
|
|
|
|
virtio_set_status(vdev, 0);
|
|
qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, NULL,
|
|
NULL, NULL, NULL, false);
|
|
vhost_dev_cleanup(&s->dev);
|
|
vhost_dev_free_inflight(s->inflight);
|
|
g_free(s->vhost_vqs);
|
|
s->vhost_vqs = NULL;
|
|
g_free(s->inflight);
|
|
s->inflight = NULL;
|
|
|
|
for (i = 0; i < s->num_queues; i++) {
|
|
virtio_delete_queue(s->virtqs[i]);
|
|
}
|
|
g_free(s->virtqs);
|
|
virtio_cleanup(vdev);
|
|
vhost_user_cleanup(&s->vhost_user);
|
|
}
|
|
|
|
static void vhost_user_blk_instance_init(Object *obj)
|
|
{
|
|
VHostUserBlk *s = VHOST_USER_BLK(obj);
|
|
|
|
device_add_bootindex_property(obj, &s->bootindex, "bootindex",
|
|
"/disk@0,0", DEVICE(obj));
|
|
}
|
|
|
|
static struct vhost_dev *vhost_user_blk_get_vhost(VirtIODevice *vdev)
|
|
{
|
|
VHostUserBlk *s = VHOST_USER_BLK(vdev);
|
|
return &s->dev;
|
|
}
|
|
|
|
static const VMStateDescription vmstate_vhost_user_blk = {
|
|
.name = "vhost-user-blk",
|
|
.minimum_version_id = 1,
|
|
.version_id = 1,
|
|
.fields = (const VMStateField[]) {
|
|
VMSTATE_VIRTIO_DEVICE,
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
};
|
|
|
|
static Property vhost_user_blk_properties[] = {
|
|
DEFINE_PROP_CHR("chardev", VHostUserBlk, chardev),
|
|
DEFINE_PROP_UINT16("num-queues", VHostUserBlk, num_queues,
|
|
VHOST_USER_BLK_AUTO_NUM_QUEUES),
|
|
DEFINE_PROP_UINT32("queue-size", VHostUserBlk, queue_size, 128),
|
|
DEFINE_PROP_BIT64("config-wce", VHostUserBlk, parent_obj.host_features,
|
|
VIRTIO_BLK_F_CONFIG_WCE, true),
|
|
DEFINE_PROP_BIT64("discard", VHostUserBlk, parent_obj.host_features,
|
|
VIRTIO_BLK_F_DISCARD, true),
|
|
DEFINE_PROP_BIT64("write-zeroes", VHostUserBlk, parent_obj.host_features,
|
|
VIRTIO_BLK_F_WRITE_ZEROES, true),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void vhost_user_blk_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
|
|
|
device_class_set_props(dc, vhost_user_blk_properties);
|
|
dc->vmsd = &vmstate_vhost_user_blk;
|
|
dc->sync_config = vhost_user_blk_sync_config;
|
|
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
|
|
vdc->realize = vhost_user_blk_device_realize;
|
|
vdc->unrealize = vhost_user_blk_device_unrealize;
|
|
vdc->get_config = vhost_user_blk_update_config;
|
|
vdc->set_config = vhost_user_blk_set_config;
|
|
vdc->get_features = vhost_user_blk_get_features;
|
|
vdc->set_status = vhost_user_blk_set_status;
|
|
vdc->reset = vhost_user_blk_reset;
|
|
vdc->get_vhost = vhost_user_blk_get_vhost;
|
|
}
|
|
|
|
static const TypeInfo vhost_user_blk_info = {
|
|
.name = TYPE_VHOST_USER_BLK,
|
|
.parent = TYPE_VIRTIO_DEVICE,
|
|
.instance_size = sizeof(VHostUserBlk),
|
|
.instance_init = vhost_user_blk_instance_init,
|
|
.class_init = vhost_user_blk_class_init,
|
|
};
|
|
|
|
static void virtio_register_types(void)
|
|
{
|
|
type_register_static(&vhost_user_blk_info);
|
|
}
|
|
|
|
type_init(virtio_register_types)
|