vhost-user-blk: introduce a new vhost-user-blk host device
This commit introduces a new vhost-user device for block, it uses a
chardev to connect with the backend, same with Qemu virito-blk device,
Guest OS still uses the virtio-blk frontend driver.
To use it, start QEMU with command line like this:
qemu-system-x86_64 \
-chardev socket,id=char0,path=/path/vhost.socket \
-device vhost-user-blk-pci,chardev=char0,num-queues=2, \
bootindex=2... \
Users can use different parameters for `num-queues` and `bootindex`.
Different with exist Qemu virtio-blk host device, it makes more easy
for users to implement their own I/O processing logic, such as all
user space I/O stack against hardware block device. It uses the new
vhost messages(VHOST_USER_GET_CONFIG) to get block virtio config
information from backend process.
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Changpeng Liu
Michael S. Tsirkin
parent
4c3e257b5e
commit
00343e4b54
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@ -43,3 +43,4 @@ CONFIG_VGA_PCI=y
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CONFIG_IVSHMEM_DEVICE=$(CONFIG_IVSHMEM)
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CONFIG_ROCKER=y
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CONFIG_VHOST_USER_SCSI=$(call land,$(CONFIG_VHOST_USER),$(CONFIG_LINUX))
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CONFIG_VHOST_USER_BLK=$(call land,$(CONFIG_VHOST_USER),$(CONFIG_LINUX))
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@ -1,6 +1,7 @@
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CONFIG_PCI=y
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CONFIG_VIRTIO_PCI=$(CONFIG_PCI)
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CONFIG_VHOST_USER_SCSI=$(call land,$(CONFIG_VHOST_USER),$(CONFIG_LINUX))
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CONFIG_VHOST_USER_BLK=$(call land,$(CONFIG_VHOST_USER),$(CONFIG_LINUX))
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CONFIG_VIRTIO=y
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CONFIG_SCLPCONSOLE=y
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CONFIG_TERMINAL3270=y
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@ -13,3 +13,6 @@ obj-$(CONFIG_SH4) += tc58128.o
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obj-$(CONFIG_VIRTIO) += virtio-blk.o
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obj-$(CONFIG_VIRTIO) += dataplane/
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ifeq ($(CONFIG_VIRTIO),y)
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obj-$(CONFIG_VHOST_USER_BLK) += vhost-user-blk.o
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endif
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@ -0,0 +1,359 @@
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/*
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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/typedefs.h"
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#include "qemu/cutils.h"
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#include "qom/object.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-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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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_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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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 void 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;
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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;
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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_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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/* 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;
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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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}
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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 (!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 = status & VIRTIO_CONFIG_S_DRIVER_OK;
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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->dev.started == should_start) {
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return;
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}
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if (should_start) {
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vhost_user_blk_start(vdev);
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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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uint64_t get_features;
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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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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->config_ro) {
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virtio_add_feature(&features, VIRTIO_BLK_F_RO);
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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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get_features = vhost_get_features(&s->dev, user_feature_bits, features);
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return get_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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}
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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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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 || 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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virtio_init(vdev, "virtio-blk", VIRTIO_ID_BLOCK,
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sizeof(struct virtio_blk_config));
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for (i = 0; i < s->num_queues; i++) {
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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->dev.nvqs = s->num_queues;
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s->dev.vqs = g_new(struct vhost_virtqueue, s->dev.nvqs);
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s->dev.vq_index = 0;
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s->dev.backend_features = 0;
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ret = vhost_dev_init(&s->dev, &s->chardev, VHOST_BACKEND_TYPE_USER, 0);
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if (ret < 0) {
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error_setg(errp, "vhost-user-blk: vhost initialization failed: %s",
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strerror(-ret));
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goto virtio_err;
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}
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ret = vhost_dev_get_config(&s->dev, (uint8_t *)&s->blkcfg,
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sizeof(struct virtio_blk_config));
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if (ret < 0) {
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error_setg(errp, "vhost-user-blk: get block config failed");
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goto vhost_err;
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}
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if (s->blkcfg.num_queues != s->num_queues) {
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s->blkcfg.num_queues = s->num_queues;
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}
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vhost_dev_set_config_notifier(&s->dev, &blk_ops);
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return;
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vhost_err:
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vhost_dev_cleanup(&s->dev);
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virtio_err:
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g_free(s->dev.vqs);
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virtio_cleanup(vdev);
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}
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static void vhost_user_blk_device_unrealize(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(dev);
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vhost_user_blk_set_status(vdev, 0);
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vhost_dev_cleanup(&s->dev);
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g_free(s->dev.vqs);
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virtio_cleanup(vdev);
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}
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static void vhost_user_blk_instance_init(Object *obj)
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{
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VHostUserBlk *s = VHOST_USER_BLK(obj);
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device_add_bootindex_property(obj, &s->bootindex, "bootindex",
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"/disk@0,0", DEVICE(obj), NULL);
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}
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static const VMStateDescription vmstate_vhost_user_blk = {
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.name = "vhost-user-blk",
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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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static Property vhost_user_blk_properties[] = {
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DEFINE_PROP_CHR("chardev", VHostUserBlk, chardev),
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DEFINE_PROP_UINT16("num-queues", VHostUserBlk, num_queues, 1),
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DEFINE_PROP_UINT32("queue-size", VHostUserBlk, queue_size, 128),
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DEFINE_PROP_BIT("config-wce", VHostUserBlk, config_wce, 0, true),
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DEFINE_PROP_BIT("config-ro", VHostUserBlk, config_ro, 0, false),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void vhost_user_blk_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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dc->props = vhost_user_blk_properties;
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dc->vmsd = &vmstate_vhost_user_blk;
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set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
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vdc->realize = vhost_user_blk_device_realize;
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vdc->unrealize = vhost_user_blk_device_unrealize;
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vdc->get_config = vhost_user_blk_update_config;
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vdc->set_config = vhost_user_blk_set_config;
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vdc->get_features = vhost_user_blk_get_features;
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vdc->set_status = vhost_user_blk_set_status;
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}
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static const TypeInfo vhost_user_blk_info = {
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.name = TYPE_VHOST_USER_BLK,
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.parent = TYPE_VIRTIO_DEVICE,
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.instance_size = sizeof(VHostUserBlk),
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.instance_init = vhost_user_blk_instance_init,
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.class_init = vhost_user_blk_class_init,
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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_blk_info);
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}
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type_init(virtio_register_types)
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@ -1978,6 +1978,58 @@ static const TypeInfo virtio_blk_pci_info = {
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.class_init = virtio_blk_pci_class_init,
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};
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#if defined(CONFIG_VHOST_USER) && defined(CONFIG_LINUX)
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/* vhost-user-blk */
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static Property vhost_user_blk_pci_properties[] = {
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DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
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DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void vhost_user_blk_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
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{
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VHostUserBlkPCI *dev = VHOST_USER_BLK_PCI(vpci_dev);
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DeviceState *vdev = DEVICE(&dev->vdev);
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qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
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object_property_set_bool(OBJECT(vdev), true, "realized", errp);
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}
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static void vhost_user_blk_pci_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
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PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
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set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
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dc->props = vhost_user_blk_pci_properties;
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k->realize = vhost_user_blk_pci_realize;
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pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
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pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
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||||
pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
|
||||
pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
|
||||
}
|
||||
|
||||
static void vhost_user_blk_pci_instance_init(Object *obj)
|
||||
{
|
||||
VHostUserBlkPCI *dev = VHOST_USER_BLK_PCI(obj);
|
||||
|
||||
virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
|
||||
TYPE_VHOST_USER_BLK);
|
||||
object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
|
||||
"bootindex", &error_abort);
|
||||
}
|
||||
|
||||
static const TypeInfo vhost_user_blk_pci_info = {
|
||||
.name = TYPE_VHOST_USER_BLK_PCI,
|
||||
.parent = TYPE_VIRTIO_PCI,
|
||||
.instance_size = sizeof(VHostUserBlkPCI),
|
||||
.instance_init = vhost_user_blk_pci_instance_init,
|
||||
.class_init = vhost_user_blk_pci_class_init,
|
||||
};
|
||||
#endif
|
||||
|
||||
/* virtio-scsi-pci */
|
||||
|
||||
static Property virtio_scsi_pci_properties[] = {
|
||||
|
|
@ -2624,6 +2676,9 @@ static void virtio_pci_register_types(void)
|
|||
type_register_static(&virtio_9p_pci_info);
|
||||
#endif
|
||||
type_register_static(&virtio_blk_pci_info);
|
||||
#if defined(CONFIG_VHOST_USER) && defined(CONFIG_LINUX)
|
||||
type_register_static(&vhost_user_blk_pci_info);
|
||||
#endif
|
||||
type_register_static(&virtio_scsi_pci_info);
|
||||
type_register_static(&virtio_balloon_pci_info);
|
||||
type_register_static(&virtio_serial_pci_info);
|
||||
|
|
|
|||
|
|
@ -27,6 +27,9 @@
|
|||
#include "hw/virtio/virtio-gpu.h"
|
||||
#include "hw/virtio/virtio-crypto.h"
|
||||
#include "hw/virtio/vhost-user-scsi.h"
|
||||
#if defined(CONFIG_VHOST_USER) && defined(CONFIG_LINUX)
|
||||
#include "hw/virtio/vhost-user-blk.h"
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_VIRTFS
|
||||
#include "hw/9pfs/virtio-9p.h"
|
||||
|
|
@ -46,6 +49,7 @@ typedef struct VirtIOSerialPCI VirtIOSerialPCI;
|
|||
typedef struct VirtIONetPCI VirtIONetPCI;
|
||||
typedef struct VHostSCSIPCI VHostSCSIPCI;
|
||||
typedef struct VHostUserSCSIPCI VHostUserSCSIPCI;
|
||||
typedef struct VHostUserBlkPCI VHostUserBlkPCI;
|
||||
typedef struct VirtIORngPCI VirtIORngPCI;
|
||||
typedef struct VirtIOInputPCI VirtIOInputPCI;
|
||||
typedef struct VirtIOInputHIDPCI VirtIOInputHIDPCI;
|
||||
|
|
@ -244,6 +248,20 @@ struct VHostUserSCSIPCI {
|
|||
VHostUserSCSI vdev;
|
||||
};
|
||||
|
||||
#if defined(CONFIG_VHOST_USER) && defined(CONFIG_LINUX)
|
||||
/*
|
||||
* vhost-user-blk-pci: This extends VirtioPCIProxy.
|
||||
*/
|
||||
#define TYPE_VHOST_USER_BLK_PCI "vhost-user-blk-pci"
|
||||
#define VHOST_USER_BLK_PCI(obj) \
|
||||
OBJECT_CHECK(VHostUserBlkPCI, (obj), TYPE_VHOST_USER_BLK_PCI)
|
||||
|
||||
struct VHostUserBlkPCI {
|
||||
VirtIOPCIProxy parent_obj;
|
||||
VHostUserBlk vdev;
|
||||
};
|
||||
#endif
|
||||
|
||||
/*
|
||||
* virtio-blk-pci: This extends VirtioPCIProxy.
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -0,0 +1,41 @@
|
|||
/*
|
||||
* vhost-user-blk host device
|
||||
* Copyright(C) 2017 Intel Corporation.
|
||||
*
|
||||
* Authors:
|
||||
* Changpeng Liu <changpeng.liu@intel.com>
|
||||
*
|
||||
* Based on vhost-scsi.h, Copyright IBM, Corp. 2011
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef VHOST_USER_BLK_H
|
||||
#define VHOST_USER_BLK_H
|
||||
|
||||
#include "standard-headers/linux/virtio_blk.h"
|
||||
#include "qemu-common.h"
|
||||
#include "hw/qdev.h"
|
||||
#include "hw/block/block.h"
|
||||
#include "chardev/char-fe.h"
|
||||
#include "hw/virtio/vhost.h"
|
||||
|
||||
#define TYPE_VHOST_USER_BLK "vhost-user-blk"
|
||||
#define VHOST_USER_BLK(obj) \
|
||||
OBJECT_CHECK(VHostUserBlk, (obj), TYPE_VHOST_USER_BLK)
|
||||
|
||||
typedef struct VHostUserBlk {
|
||||
VirtIODevice parent_obj;
|
||||
CharBackend chardev;
|
||||
int32_t bootindex;
|
||||
struct virtio_blk_config blkcfg;
|
||||
uint16_t num_queues;
|
||||
uint32_t queue_size;
|
||||
uint32_t config_wce;
|
||||
uint32_t config_ro;
|
||||
struct vhost_dev dev;
|
||||
} VHostUserBlk;
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue