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[RFC PATCH 1/1] block: add vhost-blk backend
|
From: |
Andrey Zhadchenko |
|
Subject: |
[RFC PATCH 1/1] block: add vhost-blk backend |
|
Date: |
Mon, 25 Jul 2022 23:55:27 +0300 |
Although QEMU virtio is quite fast, there is still some room for
improvements. Disk latency can be reduced if we handle virito-blk requests
in host kernel istead of passing them to QEMU. The patch adds vhost-blk
backend which sets up vhost-blk kernel module to process requests.
test setup and results:
fio --direct=1 --rw=randread --bs=4k --ioengine=libaio --iodepth=128
QEMU drive options: cache=none
filesystem: xfs
SSD:
| randread, IOPS | randwrite, IOPS |
Host | 95.8k | 85.3k |
QEMU virtio | 57.5k | 79.4k |
QEMU vhost-blk | 95.6k | 84.3k |
RAMDISK (vq == vcpu):
| randread, IOPS | randwrite, IOPS |
virtio, 1vcpu | 123k | 129k |
virtio, 2vcpu | 253k (??) | 250k (??) |
virtio, 4vcpu | 158k | 154k |
vhost-blk, 1vcpu | 110k | 113k |
vhost-blk, 2vcpu | 247k | 252k |
vhost-blk, 4vcpu | 576k | 567k |
Signed-off-by: Andrey Zhadchenko <andrey.zhadchenko@virtuozzo.com>
---
hw/block/Kconfig | 5 +
hw/block/meson.build | 4 +
hw/block/vhost-blk.c | 394 ++++++++++++++++++++++++++++++++++
hw/virtio/meson.build | 3 +
hw/virtio/vhost-blk-pci.c | 102 +++++++++
include/hw/virtio/vhost-blk.h | 50 +++++
meson.build | 5 +
7 files changed, 563 insertions(+)
create mode 100644 hw/block/vhost-blk.c
create mode 100644 hw/virtio/vhost-blk-pci.c
create mode 100644 include/hw/virtio/vhost-blk.h
diff --git a/hw/block/Kconfig b/hw/block/Kconfig
index 9e8f28f982..b4286ad10e 100644
--- a/hw/block/Kconfig
+++ b/hw/block/Kconfig
@@ -36,6 +36,11 @@ config VIRTIO_BLK
default y
depends on VIRTIO
+config VHOST_BLK
+ bool
+ default n
+ depends on VIRTIO && LINUX
+
config VHOST_USER_BLK
bool
# Only PCI devices are provided for now
diff --git a/hw/block/meson.build b/hw/block/meson.build
index 2389326112..caf9bedff3 100644
--- a/hw/block/meson.build
+++ b/hw/block/meson.build
@@ -19,4 +19,8 @@ softmmu_ss.add(when: 'CONFIG_TC58128', if_true:
files('tc58128.c'))
specific_ss.add(when: 'CONFIG_VIRTIO_BLK', if_true: files('virtio-blk.c'))
specific_ss.add(when: 'CONFIG_VHOST_USER_BLK', if_true:
files('vhost-user-blk.c'))
+if have_vhost_blk
+ specific_ss.add(files('vhost-blk.c'))
+endif
+
subdir('dataplane')
diff --git a/hw/block/vhost-blk.c b/hw/block/vhost-blk.c
new file mode 100644
index 0000000000..33d90af270
--- /dev/null
+++ b/hw/block/vhost-blk.c
@@ -0,0 +1,394 @@
+/*
+ * Copyright (c) 2022 Virtuozzo International GmbH.
+ * Author: Andrey Zhadchenko <andrey.zhadchenko@virtuozzo.com>
+ *
+ * vhost-blk is host kernel accelerator for virtio-blk.
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+#include "qom/object.h"
+#include "hw/qdev-core.h"
+#include "hw/boards.h"
+#include "hw/virtio/vhost.h"
+#include "hw/virtio/vhost-blk.h"
+#include "hw/virtio/virtio.h"
+#include "hw/virtio/virtio-blk.h"
+#include "hw/virtio/virtio-bus.h"
+#include "hw/virtio/virtio-access.h"
+#include "hw/virtio/virtio-pci.h"
+#include "sysemu/sysemu.h"
+#include "linux-headers/linux/vhost.h"
+#include <sys/ioctl.h>
+#include <linux/fs.h>
+
+static int vhost_blk_start(VirtIODevice *vdev)
+{
+ VHostBlk *s = VHOST_BLK(vdev);
+ struct vhost_vring_file backend;
+ int ret, i;
+ int *fd = blk_bs(s->conf.conf.blk)->file->bs->opaque;
+ BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
+ VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
+
+ if (!k->set_guest_notifiers) {
+ error_report("vhost-blk: binding does not support guest notifiers");
+ return -ENOSYS;
+ }
+
+ if (s->vhost_started) {
+ return 0;
+ }
+
+ if (ioctl(s->vhostfd, VHOST_SET_OWNER, NULL)) {
+ error_report("vhost-blk: unable to set owner");
+ return -ENOSYS;
+ }
+
+ ret = vhost_dev_enable_notifiers(&s->dev, vdev);
+ if (ret < 0) {
+ error_report("vhost-blk: unable to enable dev notifiers", errno);
+ return ret;
+ }
+
+ s->dev.acked_features = vdev->guest_features & s->dev.backend_features;
+
+ ret = vhost_dev_start(&s->dev, vdev);
+ if (ret < 0) {
+ error_report("vhost-blk: unable to start vhost dev");
+ return ret;
+ }
+
+ ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, true);
+ if (ret < 0) {
+ error_report("vhost-blk: unable to bind guest notifiers");
+ goto out;
+ }
+
+ memset(&backend, 0, sizeof(backend));
+ backend.index = 0;
+ backend.fd = *fd;
+ if (ioctl(s->vhostfd, VHOST_BLK_SET_BACKEND, &backend)) {
+ error_report("vhost-blk: unable to set backend");
+ ret = -errno;
+ goto out;
+ }
+
+ for (i = 0; i < s->dev.nvqs; i++) {
+ vhost_virtqueue_mask(&s->dev, vdev, i, false);
+ }
+
+ event_notifier_set(virtio_queue_get_host_notifier(virtio_get_queue(vdev,
0)));
+
+ s->vhost_started = true;
+
+ return 0;
+
+out:
+ vhost_dev_stop(&s->dev, vdev);
+ return ret;
+
+}
+
+static void vhost_blk_stop(VirtIODevice *vdev)
+{
+ BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
+ VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
+ VHostBlk *s = VHOST_BLK(vdev);
+ int ret;
+
+ if (!s->vhost_started) {
+ return;
+ }
+
+ ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, false);
+ if (ret < 0) {
+ error_report("vhost-blk: unable to unbind guest notifiers");
+ }
+ vhost_dev_disable_notifiers(&s->dev, vdev);
+ vhost_dev_stop(&s->dev, vdev);
+
+ s->vhost_started = false;
+}
+
+static void vhost_blk_reset(VirtIODevice *vdev)
+{
+ VHostBlk *s = VHOST_BLK(vdev);
+ int ret;
+
+ vhost_blk_stop(vdev);
+ ret = ioctl(s->vhostfd, VHOST_RESET_OWNER, NULL);
+ if (ret && errno != EPERM) {
+ error_report("vhost-blk: failed to reset owner %d", errno);
+ }
+}
+
+static void vhost_blk_set_status(VirtIODevice *vdev, uint8_t status)
+{
+ if (status & (VIRTIO_CONFIG_S_NEEDS_RESET | VIRTIO_CONFIG_S_FAILED)) {
+ vhost_blk_stop(vdev);
+ return;
+ }
+
+ if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ return;
+ }
+
+ if (vhost_blk_start(vdev)) {
+ error_report("vhost-blk: failed to start");
+ }
+}
+
+static void vhost_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
+{
+}
+
+static void vhost_blk_device_realize(DeviceState *dev, Error **errp)
+{
+ VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+ VHostBlk *s = VHOST_BLK(vdev);
+ VhostBlkConf *conf = &s->conf;
+ int i, ret;
+
+ if (!conf->conf.blk) {
+ error_setg(errp, "vhost-blk: drive property not set");
+ return;
+ }
+
+ if (!blk_is_inserted(conf->conf.blk)) {
+ error_setg(errp, "vhost-blk: device needs media, but drive is empty");
+ return;
+ }
+
+ if (conf->num_queues == VHOST_BLK_AUTO_NUM_QUEUES) {
+ conf->num_queues = MIN(virtio_pci_optimal_num_queues(0),
+ VHOST_BLK_MAX_QUEUES);
+ }
+
+ if (!conf->num_queues) {
+ error_setg(errp, "vhost-blk: num-queues property must be larger than
0");
+ return;
+ }
+
+ if (conf->queue_size <= 2) {
+ error_setg(errp, "vhost-blk: invalid queue-size property (%" PRIu16
"), "
+ "must be > 2", conf->queue_size);
+ return;
+ }
+
+ if (!is_power_of_2(conf->queue_size) ||
+ conf->queue_size > VIRTQUEUE_MAX_SIZE) {
+ error_setg(errp, "vhost_blk: invalid queue-size property (%" PRIu16
"), "
+ "must be a power of 2 (max %d)",
+ conf->queue_size, VIRTQUEUE_MAX_SIZE);
+ return;
+ }
+
+ if (!blkconf_apply_backend_options(&conf->conf,
+
!blk_supports_write_perm(conf->conf.blk),
+ true, errp)) {
+ return;
+ }
+
+ if (!blkconf_geometry(&conf->conf, NULL, 65535, 255, 255, errp)) {
+ return;
+ }
+
+ if (!blkconf_blocksizes(&conf->conf, errp)) {
+ return;
+ }
+
+ s->dev.nvqs = conf->num_queues;
+ s->dev.max_queues = conf->num_queues;
+ s->dev.vqs = g_new(struct vhost_virtqueue, s->dev.nvqs);
+ s->dev.vq_index = 0;
+
+ virtio_init(vdev, VIRTIO_ID_BLOCK, sizeof(struct virtio_blk_config));
+
+ for (i = 0; i < conf->num_queues; i++) {
+ virtio_add_queue(vdev, conf->queue_size, vhost_blk_handle_output);
+ }
+
+ s->vhostfd = open("/dev/vhost-blk", O_RDWR);
+ if (s->vhostfd < 0) {
+ error_setg(errp, "vhost-blk: unable to open /dev/vhost-blk");
+ goto cleanup;
+ }
+
+ s->dev.acked_features = 0;
+ ret = ioctl(s->vhostfd, VHOST_GET_FEATURES, &s->dev.backend_features);
+ if (ret < 0) {
+ error_setg(errp, "vhost-blk: unable to get backend features");
+ goto cleanup;
+ }
+
+ ret = vhost_dev_init(&s->dev, (void *)((size_t)s->vhostfd),
+ VHOST_BACKEND_TYPE_KERNEL, 0, false);
+ if (ret < 0) {
+ error_setg(errp, "vhost-blk: vhost initialization failed: %s",
+ strerror(-ret));
+ goto cleanup;
+ }
+
+ return;
+
+cleanup:
+ g_free(s->dev.vqs);
+ close(s->vhostfd);
+ for (i = 0; i < conf->num_queues; i++) {
+ virtio_del_queue(vdev, i);
+ }
+ virtio_cleanup(vdev);
+ return;
+}
+
+static void vhost_blk_device_unrealize(DeviceState *dev)
+{
+ VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+ VHostBlk *s = VHOST_BLK(dev);
+
+ vhost_blk_set_status(vdev, 0);
+ vhost_dev_cleanup(&s->dev);
+ g_free(s->dev.vqs);
+ virtio_cleanup(vdev);
+}
+
+static const int user_feature_bits[] = {
+ VIRTIO_BLK_F_FLUSH,
+ VIRTIO_RING_F_INDIRECT_DESC,
+ VIRTIO_RING_F_EVENT_IDX,
+ VHOST_INVALID_FEATURE_BIT
+};
+
+
+static uint64_t vhost_blk_get_features(VirtIODevice *vdev,
+ uint64_t features,
+ Error **errp)
+{
+ VHostBlk *s = VHOST_BLK(vdev);
+ uint64_t res;
+
+ features |= s->host_features;
+
+ virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE);
+ virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX);
+ virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY);
+ virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY);
+ virtio_add_feature(&features, VIRTIO_BLK_F_SIZE_MAX);
+
+ virtio_add_feature(&features, VIRTIO_F_VERSION_1);
+
+ if (!blk_is_writable(s->conf.conf.blk)) {
+ virtio_add_feature(&features, VIRTIO_BLK_F_RO);
+ }
+
+ if (s->conf.num_queues > 1) {
+ virtio_add_feature(&features, VIRTIO_BLK_F_MQ);
+ }
+
+ res = vhost_get_features(&s->dev, user_feature_bits, features);
+
+ return res;
+}
+
+static void vhost_blk_update_config(VirtIODevice *vdev, uint8_t *config)
+{
+ VHostBlk *s = VHOST_BLK(vdev);
+ BlockConf *conf = &s->conf.conf;
+ struct virtio_blk_config blkcfg;
+ uint64_t capacity;
+ int64_t length;
+ int blk_size = conf->logical_block_size;
+
+ blk_get_geometry(s->conf.conf.blk, &capacity);
+ memset(&blkcfg, 0, sizeof(blkcfg));
+ virtio_stq_p(vdev, &blkcfg.capacity, capacity);
+ virtio_stl_p(vdev, &blkcfg.seg_max, s->conf.queue_size - 2);
+ virtio_stw_p(vdev, &blkcfg.geometry.cylinders, conf->cyls);
+ virtio_stl_p(vdev, &blkcfg.blk_size, blk_size);
+ blkcfg.geometry.heads = conf->heads;
+
+ length = blk_getlength(s->conf.conf.blk);
+ if (length > 0 && length / conf->heads / conf->secs % blk_size) {
+ unsigned short mask;
+
+ mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1;
+ blkcfg.geometry.sectors = conf->secs & ~mask;
+ } else {
+ blkcfg.geometry.sectors = conf->secs;
+ }
+
+ blkcfg.size_max = 0;
+ blkcfg.physical_block_exp = get_physical_block_exp(conf);
+ blkcfg.alignment_offset = 0;
+ virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues);
+
+ memcpy(config, &blkcfg, sizeof(struct virtio_blk_config));
+}
+
+static Property vhost_blk_properties[] = {
+ DEFINE_BLOCK_PROPERTIES(VHostBlk, conf.conf),
+ DEFINE_PROP_UINT16("num-queues", VHostBlk, conf.num_queues,
+ VHOST_BLK_AUTO_NUM_QUEUES),
+ DEFINE_PROP_UINT16("queue-size", VHostBlk, conf.queue_size, 256),
+/* Discard and write-zeroes not yet implemented in kernel module */
+ DEFINE_PROP_BIT64("discard", VHostBlk, host_features,
+ VIRTIO_BLK_F_DISCARD, false),
+ DEFINE_PROP_BIT64("write-zeroes", VHostBlk, host_features,
+ VIRTIO_BLK_F_WRITE_ZEROES, false),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static const VMStateDescription vmstate_vhost_blk = {
+ .name = "vhost-blk",
+ .minimum_version_id = 1,
+ .version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_VIRTIO_DEVICE,
+ VMSTATE_END_OF_LIST()
+ },
+};
+
+static void vhost_blk_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
+
+ device_class_set_props(dc, vhost_blk_properties);
+ dc->vmsd = &vmstate_vhost_blk;
+ set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
+ vdc->realize = vhost_blk_device_realize;
+ vdc->unrealize = vhost_blk_device_unrealize;
+ vdc->get_config = vhost_blk_update_config;
+ vdc->get_features = vhost_blk_get_features;
+ vdc->set_status = vhost_blk_set_status;
+ vdc->reset = vhost_blk_reset;
+}
+
+static void vhost_blk_instance_init(Object *obj)
+{
+ VHostBlk *s = VHOST_BLK(obj);
+
+ device_add_bootindex_property(obj, &s->conf.conf.bootindex,
+ "bootindex", "/disk@0,0",
+ DEVICE(obj));
+}
+
+static const TypeInfo vhost_blk_info = {
+ .name = TYPE_VHOST_BLK,
+ .parent = TYPE_VIRTIO_DEVICE,
+ .instance_size = sizeof(VHostBlk),
+ .instance_init = vhost_blk_instance_init,
+ .class_init = vhost_blk_class_init,
+};
+
+static void virtio_register_types(void)
+{
+ type_register_static(&vhost_blk_info);
+}
+
+type_init(virtio_register_types)
diff --git a/hw/virtio/meson.build b/hw/virtio/meson.build
index 7e8877fd64..fb2c0e7242 100644
--- a/hw/virtio/meson.build
+++ b/hw/virtio/meson.build
@@ -40,6 +40,9 @@ virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_RNG', if_true:
files('vhost-user-rng-
virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_SCSI', if_true:
files('vhost-user-scsi-pci.c'))
virtio_pci_ss.add(when: 'CONFIG_VHOST_SCSI', if_true:
files('vhost-scsi-pci.c'))
virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_FS', if_true:
files('vhost-user-fs-pci.c'))
+if have_vhost_blk
+ virtio_ss.add(files('vhost-blk-pci.c'))
+endif
virtio_pci_ss.add(when: 'CONFIG_VIRTIO_CRYPTO', if_true:
files('virtio-crypto-pci.c'))
virtio_pci_ss.add(when: 'CONFIG_VIRTIO_INPUT_HOST', if_true:
files('virtio-input-host-pci.c'))
diff --git a/hw/virtio/vhost-blk-pci.c b/hw/virtio/vhost-blk-pci.c
new file mode 100644
index 0000000000..f3b6e112b4
--- /dev/null
+++ b/hw/virtio/vhost-blk-pci.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2022 Virtuozzo International GmbH.
+ * Author: Andrey Zhadchenko <andrey.zhadchenko@virtuozzo.com>
+ *
+ * vhost-blk PCI bindings
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+
+#include "standard-headers/linux/virtio_pci.h"
+#include "hw/virtio/virtio.h"
+#include "hw/virtio/vhost-blk.h"
+#include "hw/pci/pci.h"
+#include "hw/qdev-properties.h"
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+#include "qemu/module.h"
+#include "hw/virtio/virtio-pci.h"
+#include "qom/object.h"
+
+typedef struct VHostBlkPCI VHostBlkPCI;
+
+/*
+ * vhost-blk-pci: This extends VirtioPCIProxy.
+ */
+#define TYPE_VHOST_BLK_PCI "vhost-blk-pci-base"
+DECLARE_INSTANCE_CHECKER(VHostBlkPCI, VHOST_BLK_PCI,
+ TYPE_VHOST_BLK_PCI)
+
+struct VHostBlkPCI {
+ VirtIOPCIProxy parent_obj;
+ VHostBlk vdev;
+};
+
+static Property vhost_blk_pci_properties[] = {
+ DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
+ DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
+ DEV_NVECTORS_UNSPECIFIED),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void vhost_blk_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
+{
+ VHostBlkPCI *dev = VHOST_BLK_PCI(vpci_dev);
+ DeviceState *vdev = DEVICE(&dev->vdev);
+
+ if (dev->vdev.conf.num_queues == VHOST_BLK_AUTO_NUM_QUEUES) {
+ dev->vdev.conf.num_queues = MIN(virtio_pci_optimal_num_queues(0),
+ VHOST_BLK_MAX_QUEUES);
+ }
+
+ if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
+ vpci_dev->nvectors = dev->vdev.conf.num_queues + 1;
+ }
+
+ qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
+}
+
+static void vhost_blk_pci_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
+ PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
+
+ set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
+ device_class_set_props(dc, vhost_blk_pci_properties);
+ k->realize = vhost_blk_pci_realize;
+ pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
+ pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
+ pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
+ pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
+}
+
+static void vhost_blk_pci_instance_init(Object *obj)
+{
+ VHostBlkPCI *dev = VHOST_BLK_PCI(obj);
+
+ virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
+ TYPE_VHOST_BLK);
+ object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
+ "bootindex");
+}
+
+static const VirtioPCIDeviceTypeInfo vhost_blk_pci_info = {
+ .base_name = TYPE_VHOST_BLK_PCI,
+ .generic_name = "vhost-blk-pci",
+ .transitional_name = "vhost-blk-pci-transitional",
+ .non_transitional_name = "vhost-blk-pci-non-transitional",
+ .instance_size = sizeof(VHostBlkPCI),
+ .instance_init = vhost_blk_pci_instance_init,
+ .class_init = vhost_blk_pci_class_init,
+};
+
+static void vhost_blk_pci_register(void)
+{
+ virtio_pci_types_register(&vhost_blk_pci_info);
+}
+
+type_init(vhost_blk_pci_register)
diff --git a/include/hw/virtio/vhost-blk.h b/include/hw/virtio/vhost-blk.h
new file mode 100644
index 0000000000..76ece4215d
--- /dev/null
+++ b/include/hw/virtio/vhost-blk.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2022 Virtuozzo International GmbH.
+ * Author: Andrey Zhadchenko <andrey.zhadchenko@virtuozzo.com>
+ *
+ * vhost-blk is host kernel accelerator for virtio-blk.
+ *
+ * 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_BLK_H
+#define VHOST_BLK_H
+
+#include "standard-headers/linux/virtio_blk.h"
+#include "hw/block/block.h"
+#include "hw/virtio/vhost.h"
+#include "sysemu/block-backend.h"
+
+#define TYPE_VHOST_BLK "vhost-blk"
+#define VHOST_BLK(obj) \
+ OBJECT_CHECK(VHostBlk, (obj), TYPE_VHOST_BLK)
+
+#define VHOST_BLK_AUTO_NUM_QUEUES UINT16_MAX
+#define VHOST_BLK_MAX_QUEUES 8
+
+/*
+ * normally should be visible from imported headers
+ * temporary define here to simplify development
+ */
+#define VHOST_BLK_SET_BACKEND _IOW(VHOST_VIRTIO, 0x90, \
+ struct vhost_vring_file)
+
+typedef struct VhostBlkConf {
+ BlockConf conf;
+ uint16_t num_queues;
+ uint16_t queue_size;
+} VhostBlkConf;
+
+typedef struct VHostBlk {
+ VirtIODevice parent_obj;
+ VhostBlkConf conf;
+ uint64_t host_features;
+ uint64_t decided_features;
+ struct virtio_blk_config blkcfg;
+ int vhostfd;
+ struct vhost_dev dev;
+ bool vhost_started;
+} VHostBlk;
+
+#endif
diff --git a/meson.build b/meson.build
index 8a8c415fc1..7c00a8ce89 100644
--- a/meson.build
+++ b/meson.build
@@ -336,6 +336,9 @@ have_vhost_kernel = get_option('vhost_kernel') \
have_vhost_user_crypto = get_option('vhost_crypto') \
.require(have_vhost_user,
error_message: 'vhost-crypto requires vhost-user to be
enabled').allowed()
+have_vhost_blk = get_option('vhost_blk') \
+ .require(targetos == 'linux',
+ error_message: 'vhost-kernel is only available on Linux').allowed()
have_vhost = have_vhost_user or have_vhost_vdpa or have_vhost_kernel
@@ -1814,6 +1817,7 @@ config_host_data.set('CONFIG_VHOST_KERNEL',
have_vhost_kernel)
config_host_data.set('CONFIG_VHOST_USER', have_vhost_user)
config_host_data.set('CONFIG_VHOST_CRYPTO', have_vhost_user_crypto)
config_host_data.set('CONFIG_VHOST_VDPA', have_vhost_vdpa)
+config_host_data.set('CONFIG_VHOST_BLK', have_vhost_blk)
config_host_data.set('CONFIG_VMNET', vmnet.found())
config_host_data.set('CONFIG_VHOST_USER_BLK_SERVER',
have_vhost_user_blk_server)
config_host_data.set('CONFIG_VDUSE_BLK_EXPORT', have_vduse_blk_export)
@@ -3756,6 +3760,7 @@ summary_info += {'vhost-user support': have_vhost_user}
summary_info += {'vhost-user-crypto support': have_vhost_user_crypto}
summary_info += {'vhost-user-blk server support': have_vhost_user_blk_server}
summary_info += {'vhost-vdpa support': have_vhost_vdpa}
+summary_info += {'vhost-blk support': have_vhost_blk}
summary_info += {'build guest agent': have_ga}
summary(summary_info, bool_yn: true, section: 'Configurable features')
--
2.31.1