Treat the num_queues field as virtio-endian. On big-endian hosts the vhost-user-blk num_queues field was in the wrong endianness. Move the blkcfg.num_queues store operation from realize to vhost_user_blk_update_config() so feature negotiation has finished and we know the endianness of the device. VIRTIO 1.0 devices are little-endian, but in case someone wants to use legacy VIRTIO we support all endianness cases. Cc: qemu-stable@nongnu.org Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Message-Id: <20210223144653.811468-2-stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
594 lines
17 KiB
C
594 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/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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VHOST_INVALID_FEATURE_BIT
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};
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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, sizeof(struct virtio_blk_config));
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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_MASTER);
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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_handle_config_change(struct vhost_dev *dev)
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{
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int ret;
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struct virtio_blk_config blkcfg;
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VHostUserBlk *s = VHOST_USER_BLK(dev->vdev);
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ret = vhost_dev_get_config(dev, (uint8_t *)&blkcfg,
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sizeof(struct virtio_blk_config));
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if (ret < 0) {
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error_report("get config space failed");
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return -1;
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}
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/* valid for resize only */
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if (blkcfg.capacity != s->blkcfg.capacity) {
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s->blkcfg.capacity = blkcfg.capacity;
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memcpy(dev->vdev->config, &s->blkcfg, sizeof(struct virtio_blk_config));
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virtio_notify_config(dev->vdev);
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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)
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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_report("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_report("Error enabling host notifiers: %d", -ret);
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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_report("Error binding guest notifier: %d", -ret);
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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_report("Error set inflight format: %d", -ret);
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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_report("Error get inflight: %d", -ret);
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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_report("Error set inflight: %d", -ret);
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goto err_guest_notifiers;
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}
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ret = vhost_dev_start(&s->dev, vdev);
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if (ret < 0) {
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error_report("Error starting vhost: %d", -ret);
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goto err_guest_notifiers;
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}
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s->started_vu = true;
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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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return ret;
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err_guest_notifiers:
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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);
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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_started(vdev, status);
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int ret;
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if (!vdev->vm_running) {
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should_start = false;
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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 (s->dev.started == 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);
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if (ret < 0) {
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error_report("vhost-user-blk: vhost start failed: %s",
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strerror(-ret));
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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_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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virtio_add_feature(&features, VIRTIO_BLK_F_DISCARD);
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virtio_add_feature(&features, VIRTIO_BLK_F_WRITE_ZEROES);
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if (s->config_wce) {
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virtio_add_feature(&features, VIRTIO_BLK_F_CONFIG_WCE);
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}
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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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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 (s->dev.started) {
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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);
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if (ret < 0) {
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error_report("vhost-user-blk: vhost start failed: %s",
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strerror(-ret));
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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)
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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->connected = true;
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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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ret = vhost_dev_init(&s->dev, &s->vhost_user, VHOST_BACKEND_TYPE_USER, 0);
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if (ret < 0) {
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error_report("vhost-user-blk: vhost initialization failed: %s",
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strerror(-ret));
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return ret;
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}
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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);
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if (ret < 0) {
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error_report("vhost-user-blk: vhost start failed: %s",
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strerror(-ret));
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return ret;
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}
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}
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return 0;
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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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return;
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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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}
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static void vhost_user_blk_event(void *opaque, QEMUChrEvent event);
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static void vhost_user_blk_chr_closed_bh(void *opaque)
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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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vhost_user_blk_disconnect(dev);
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qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, vhost_user_blk_event,
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NULL, opaque, 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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switch (event) {
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case CHR_EVENT_OPENED:
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if (vhost_user_blk_connect(dev) < 0) {
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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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/*
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* A close event may happen during a read/write, but vhost
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* code assumes the vhost_dev remains setup, so delay the
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* stop & clear. There are two possible paths to hit this
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* disconnect event:
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* 1. When VM is in the RUN_STATE_PRELAUNCH state. The
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* vhost_user_blk_device_realize() is a caller.
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* 2. In tha main loop phase after VM start.
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*
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* For p2 the disconnect event will be delayed. We can't
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* do the same for p1, because we are not running the loop
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* at this moment. So just skip this step and perform
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* disconnect in the caller function.
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*
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* TODO: maybe it is a good idea to make the same fix
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* for other vhost-user devices.
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*/
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if (runstate_is_running()) {
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AioContext *ctx = qemu_get_current_aio_context();
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qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, NULL, NULL,
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NULL, NULL, false);
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aio_bh_schedule_oneshot(ctx, vhost_user_blk_chr_closed_bh, opaque);
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}
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/*
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* Move vhost device to the stopped state. The vhost-user device
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* will be clean up and disconnected in BH. This can be useful in
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* the vhost migration code. If disconnect was caught there is an
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* option for the general vhost code to get the dev state without
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* knowing its type (in this case vhost-user).
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*/
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s->dev.started = false;
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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 void vhost_user_blk_device_realize(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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Error *err = NULL;
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int i, ret;
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if (!s->chardev.chr) {
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error_setg(errp, "vhost-user-blk: 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, "vhost-user-blk: 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, "vhost-user-blk: queue size must be non-zero");
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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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virtio_init(vdev, "virtio-blk", VIRTIO_ID_BLOCK,
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sizeof(struct virtio_blk_config));
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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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s->connected = false;
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qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, vhost_user_blk_event,
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|
NULL, (void *)dev, NULL, true);
|
|
|
|
reconnect:
|
|
if (qemu_chr_fe_wait_connected(&s->chardev, &err) < 0) {
|
|
error_report_err(err);
|
|
goto virtio_err;
|
|
}
|
|
|
|
/* check whether vhost_user_blk_connect() failed or not */
|
|
if (!s->connected) {
|
|
goto reconnect;
|
|
}
|
|
|
|
ret = vhost_dev_get_config(&s->dev, (uint8_t *)&s->blkcfg,
|
|
sizeof(struct virtio_blk_config));
|
|
if (ret < 0) {
|
|
error_report("vhost-user-blk: get block config failed");
|
|
goto reconnect;
|
|
}
|
|
|
|
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 const VMStateDescription vmstate_vhost_user_blk = {
|
|
.name = "vhost-user-blk",
|
|
.minimum_version_id = 1,
|
|
.version_id = 1,
|
|
.fields = (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_BIT("config-wce", VHostUserBlk, config_wce, 0, 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;
|
|
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;
|
|
}
|
|
|
|
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)
|