This patch introduces a vDPA based vhost backend. This backend is built on top of the same interface defined in virtio-vDPA and provides a generic vhost interface for userspace to accelerate the virtio devices in guest.
This backend is implemented as a vDPA device driver on top of the same ops used in virtio-vDPA. It will create char device entry named vhost-vdpa/$vdpa_device_index for userspace to use. Userspace can use vhost ioctls on top of this char device to setup the backend. Signed-off-by: Tiwei Bie <[email protected]> --- This patch depends on below series: https://lkml.org/lkml/2020/1/16/353 Please note that _SET_MEM_TABLE isn't fully supported yet. Comments would be appreciated! Changes since last patch (https://lkml.org/lkml/2019/11/18/1068) - Switch to the vDPA bus; - Switch to vhost's own chardev; drivers/vhost/Kconfig | 12 + drivers/vhost/Makefile | 3 + drivers/vhost/vdpa.c | 705 +++++++++++++++++++++++++++++++ include/uapi/linux/vhost.h | 21 + include/uapi/linux/vhost_types.h | 8 + 5 files changed, 749 insertions(+) create mode 100644 drivers/vhost/vdpa.c diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig index f21c45aa5e07..13e6a94d0243 100644 --- a/drivers/vhost/Kconfig +++ b/drivers/vhost/Kconfig @@ -34,6 +34,18 @@ config VHOST_VSOCK To compile this driver as a module, choose M here: the module will be called vhost_vsock. +config VHOST_VDPA + tristate "Vhost driver for vDPA based backend" + depends on EVENTFD && VDPA + select VHOST + default n + ---help--- + This kernel module can be loaded in host kernel to accelerate + guest virtio devices with the vDPA based backends. + + To compile this driver as a module, choose M here: the module + will be called vhost_vdpa. + config VHOST tristate depends on VHOST_IOTLB diff --git a/drivers/vhost/Makefile b/drivers/vhost/Makefile index df99756fbb26..a65e9f4a2c0a 100644 --- a/drivers/vhost/Makefile +++ b/drivers/vhost/Makefile @@ -10,6 +10,9 @@ vhost_vsock-y := vsock.o obj-$(CONFIG_VHOST_RING) += vringh.o +obj-$(CONFIG_VHOST_VDPA) += vhost_vdpa.o +vhost_vdpa-y := vdpa.o + obj-$(CONFIG_VHOST) += vhost.o obj-$(CONFIG_VHOST_IOTLB) += vhost_iotlb.o diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c new file mode 100644 index 000000000000..631d994d37ac --- /dev/null +++ b/drivers/vhost/vdpa.c @@ -0,0 +1,705 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018-2020 Intel Corporation. + * + * Author: Tiwei Bie <[email protected]> + * + * Thanks to Jason Wang and Michael S. Tsirkin for the valuable + * comments and suggestions. And thanks to Cunming Liang and + * Zhihong Wang for all their supports. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/cdev.h> +#include <linux/device.h> +#include <linux/uuid.h> +#include <linux/vdpa.h> +#include <linux/nospec.h> +#include <linux/vhost.h> +#include <linux/virtio_net.h> + +#include "vhost.h" + +enum { + VHOST_VDPA_FEATURES = + (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | + (1ULL << VIRTIO_F_ANY_LAYOUT) | + (1ULL << VIRTIO_F_VERSION_1) | + (1ULL << VIRTIO_F_IOMMU_PLATFORM) | + (1ULL << VIRTIO_F_RING_PACKED) | + (1ULL << VIRTIO_F_ORDER_PLATFORM) | + (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | + (1ULL << VIRTIO_RING_F_EVENT_IDX), + + VHOST_VDPA_NET_FEATURES = VHOST_VDPA_FEATURES | + (1ULL << VIRTIO_NET_F_CSUM) | + (1ULL << VIRTIO_NET_F_GUEST_CSUM) | + (1ULL << VIRTIO_NET_F_MTU) | + (1ULL << VIRTIO_NET_F_MAC) | + (1ULL << VIRTIO_NET_F_GUEST_TSO4) | + (1ULL << VIRTIO_NET_F_GUEST_TSO6) | + (1ULL << VIRTIO_NET_F_GUEST_ECN) | + (1ULL << VIRTIO_NET_F_GUEST_UFO) | + (1ULL << VIRTIO_NET_F_HOST_TSO4) | + (1ULL << VIRTIO_NET_F_HOST_TSO6) | + (1ULL << VIRTIO_NET_F_HOST_ECN) | + (1ULL << VIRTIO_NET_F_HOST_UFO) | + (1ULL << VIRTIO_NET_F_MRG_RXBUF) | + (1ULL << VIRTIO_NET_F_STATUS) | + (1ULL << VIRTIO_NET_F_SPEED_DUPLEX), +}; + +/* Currently, only network backend w/o multiqueue is supported. */ +#define VHOST_VDPA_VQ_MAX 2 + +struct vhost_vdpa { + /* The lock is to protect this structure. */ + struct mutex mutex; + struct vhost_dev vdev; + struct vhost_virtqueue *vqs; + struct vdpa_device *vdpa; + struct device *dev; + atomic_t opened; + int nvqs; + int virtio_id; + int minor; +}; + +static struct { + /* The lock is to protect this structure. */ + struct mutex mutex; + struct class *class; + struct idr idr; + struct cdev cdev; + dev_t devt; + wait_queue_head_t release_q; +} vhost_vdpa; + +static const u64 vhost_vdpa_features[] = { + [VIRTIO_ID_NET] = VHOST_VDPA_NET_FEATURES, +}; + +static int vhost_vdpa_alloc_minor(struct vhost_vdpa *v) +{ + return idr_alloc(&vhost_vdpa.idr, v, 0, MINORMASK + 1, + GFP_KERNEL); +} + +static void vhost_vdpa_free_minor(int minor) +{ + idr_remove(&vhost_vdpa.idr, minor); +} + +static struct vhost_vdpa *vhost_vdpa_get_from_minor(int minor) +{ + struct vhost_vdpa *v; + + mutex_lock(&vhost_vdpa.mutex); + v = idr_find(&vhost_vdpa.idr, minor); + mutex_unlock(&vhost_vdpa.mutex); + + return v; +} + +static void handle_vq_kick(struct vhost_work *work) +{ + struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, + poll.work); + struct vhost_vdpa *v = container_of(vq->dev, struct vhost_vdpa, vdev); + const struct vdpa_config_ops *ops = v->vdpa->config; + + ops->kick_vq(v->vdpa, vq - v->vqs); +} + +static irqreturn_t vhost_vdpa_virtqueue_cb(void *private) +{ + struct vhost_virtqueue *vq = private; + struct eventfd_ctx *call_ctx = vq->call_ctx; + + if (call_ctx) + eventfd_signal(call_ctx, 1); + + return IRQ_HANDLED; +} + +static void vhost_vdpa_reset(struct vhost_vdpa *v) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + + ops->set_status(vdpa, 0); +} + +static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + u32 device_id; + + device_id = ops->get_device_id(vdpa); + + if (copy_to_user(argp, &device_id, sizeof(device_id))) + return -EFAULT; + + return 0; +} + +static long vhost_vdpa_get_status(struct vhost_vdpa *v, u8 __user *statusp) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + u8 status; + + status = ops->get_status(vdpa); + + if (copy_to_user(statusp, &status, sizeof(status))) + return -EFAULT; + + return 0; +} + +static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + u8 status; + + if (copy_from_user(&status, statusp, sizeof(status))) + return -EFAULT; + + /* + * Userspace shouldn't remove status bits unless reset the + * status to 0. + */ + if (status != 0 && (ops->get_status(vdpa) & ~status) != 0) + return -EINVAL; + + ops->set_status(vdpa, status); + + return 0; +} + +static int vhost_vdpa_config_validate(struct vhost_vdpa *v, + struct vhost_vdpa_config *c) +{ + long size = 0; + + switch (v->virtio_id) { + case VIRTIO_ID_NET: + size = sizeof(struct virtio_net_config); + break; + } + + if (c->len == 0) + return -EINVAL; + + if (c->len > size - c->off) + return -E2BIG; + + return 0; +} + +static long vhost_vdpa_get_config(struct vhost_vdpa *v, + struct vhost_vdpa_config __user *c) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + struct vhost_vdpa_config config; + unsigned long size = offsetof(struct vhost_vdpa_config, buf); + u8 *buf; + + if (copy_from_user(&config, c, size)) + return -EFAULT; + if (vhost_vdpa_config_validate(v, &config)) + return -EINVAL; + buf = kvzalloc(config.len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ops->get_config(vdpa, config.off, buf, config.len); + + if (copy_to_user(c->buf, buf, config.len)) { + kvfree(buf); + return -EFAULT; + } + + kvfree(buf); + return 0; +} + +static long vhost_vdpa_set_config(struct vhost_vdpa *v, + struct vhost_vdpa_config __user *c) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + struct vhost_vdpa_config config; + unsigned long size = offsetof(struct vhost_vdpa_config, buf); + u8 *buf; + + if (copy_from_user(&config, c, size)) + return -EFAULT; + if (vhost_vdpa_config_validate(v, &config)) + return -EINVAL; + buf = kvzalloc(config.len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + if (copy_from_user(buf, c->buf, config.len)) { + kvfree(buf); + return -EFAULT; + } + + ops->set_config(vdpa, config.off, buf, config.len); + + kvfree(buf); + return 0; +} + +static long vhost_vdpa_get_features(struct vhost_vdpa *v, u64 __user *featurep) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + u64 features; + + features = ops->get_features(vdpa); + features &= vhost_vdpa_features[v->virtio_id]; + + if (copy_to_user(featurep, &features, sizeof(features))) + return -EFAULT; + + return 0; +} + +static long vhost_vdpa_set_features(struct vhost_vdpa *v, u64 __user *featurep) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + u64 features; + + /* + * It's not allowed to change the features after they have + * been negotiated. + */ + if (ops->get_status(vdpa) & VIRTIO_CONFIG_S_FEATURES_OK) + return -EBUSY; + + if (copy_from_user(&features, featurep, sizeof(features))) + return -EFAULT; + + if (features & ~vhost_vdpa_features[v->virtio_id]) + return -EINVAL; + + if (ops->set_features(vdpa, features)) + return -EINVAL; + + return 0; +} + +static long vhost_vdpa_get_vring_num(struct vhost_vdpa *v, u16 __user *argp) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + u16 num; + + num = ops->get_vq_num_max(vdpa); + + if (copy_to_user(argp, &num, sizeof(num))) + return -EFAULT; + + return 0; +} + +static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, + void __user *argp) +{ + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + struct vdpa_callback cb; + struct vhost_virtqueue *vq; + struct vhost_vring_state s; + u8 status; + u32 idx; + long r; + + r = get_user(idx, (u32 __user *)argp); + if (r < 0) + return r; + if (idx >= v->nvqs) + return -ENOBUFS; + + idx = array_index_nospec(idx, v->nvqs); + vq = &v->vqs[idx]; + + status = ops->get_status(vdpa); + + /* + * It's not allowed to detect and program vqs before + * features negotiation or after enabling driver. + */ + if (!(status & VIRTIO_CONFIG_S_FEATURES_OK) || + (status & VIRTIO_CONFIG_S_DRIVER_OK)) + return -EBUSY; + + if (cmd == VHOST_VDPA_SET_VRING_ENABLE) { + if (copy_from_user(&s, argp, sizeof(s))) + return -EFAULT; + ops->set_vq_ready(vdpa, idx, s.num); + return 0; + } + + /* + * It's not allowed to detect and program vqs with + * vqs enabled. + */ + if (ops->get_vq_ready(vdpa, idx)) + return -EBUSY; + + if (cmd == VHOST_GET_VRING_BASE) + vq->last_avail_idx = ops->get_vq_state(v->vdpa, idx); + + r = vhost_vring_ioctl(&v->vdev, cmd, argp); + if (r) + return r; + + switch (cmd) { + case VHOST_SET_VRING_ADDR: + if (ops->set_vq_address(vdpa, idx, (u64)vq->desc, + (u64)vq->avail, (u64)vq->used)) + r = -EINVAL; + break; + + case VHOST_SET_VRING_BASE: + if (ops->set_vq_state(vdpa, idx, vq->last_avail_idx)) + r = -EINVAL; + break; + + case VHOST_SET_VRING_CALL: + if (vq->call_ctx) { + cb.callback = vhost_vdpa_virtqueue_cb; + cb.private = vq; + } else { + cb.callback = NULL; + cb.private = NULL; + } + ops->set_vq_cb(vdpa, idx, &cb); + break; + + case VHOST_SET_VRING_NUM: + ops->set_vq_num(vdpa, idx, vq->num); + break; + } + + return r; +} + +static long vhost_vdpa_do_dma_mapping(struct vhost_vdpa *v) +{ + /* TODO: fix this */ + return -ENOTSUPP; +} + +static int vhost_vdpa_open(struct inode *inode, struct file *filep) +{ + struct vhost_vdpa *v; + struct vhost_dev *dev; + struct vhost_virtqueue **vqs; + int nvqs, i, r, opened; + + v = vhost_vdpa_get_from_minor(iminor(inode)); + if (!v) + return -ENODEV; + + opened = atomic_cmpxchg(&v->opened, 0, 1); + if (opened) { + r = -EBUSY; + goto err; + } + + nvqs = v->nvqs; + vhost_vdpa_reset(v); + + vqs = kmalloc_array(nvqs, sizeof(*vqs), GFP_KERNEL); + if (!vqs) { + r = -ENOMEM; + goto err; + } + + dev = &v->vdev; + for (i = 0; i < nvqs; i++) { + vqs[i] = &v->vqs[i]; + vqs[i]->handle_kick = handle_vq_kick; + } + vhost_dev_init(dev, vqs, nvqs, 0, 0, 0); + + filep->private_data = v; + + return 0; + +err: + atomic_dec(&v->opened); + return r; +} + +static int vhost_vdpa_release(struct inode *inode, struct file *filep) +{ + struct vhost_vdpa *v = filep->private_data; + + mutex_lock(&v->mutex); + filep->private_data = NULL; + vhost_vdpa_reset(v); + vhost_dev_stop(&v->vdev); + vhost_dev_cleanup(&v->vdev); + kfree(v->vdev.vqs); + mutex_unlock(&v->mutex); + + atomic_dec(&v->opened); + wake_up(&vhost_vdpa.release_q); + + return 0; +} + +static long vhost_vdpa_unlocked_ioctl(struct file *filep, + unsigned int cmd, unsigned long arg) +{ + struct vhost_vdpa *v = filep->private_data; + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + void __user *argp = (void __user *)arg; + long r; + + mutex_lock(&v->mutex); + + switch (cmd) { + case VHOST_VDPA_GET_DEVICE_ID: + r = vhost_vdpa_get_device_id(v, argp); + break; + case VHOST_VDPA_GET_STATUS: + r = vhost_vdpa_get_status(v, argp); + break; + case VHOST_VDPA_SET_STATUS: + r = vhost_vdpa_set_status(v, argp); + break; + case VHOST_VDPA_GET_CONFIG: + r = vhost_vdpa_get_config(v, argp); + break; + case VHOST_VDPA_SET_CONFIG: + r = vhost_vdpa_set_config(v, argp); + break; + case VHOST_GET_FEATURES: + r = vhost_vdpa_get_features(v, argp); + break; + case VHOST_SET_FEATURES: + r = vhost_vdpa_set_features(v, argp); + break; + case VHOST_VDPA_GET_VRING_NUM: + r = vhost_vdpa_get_vring_num(v, argp); + break; + case VHOST_SET_LOG_BASE: + case VHOST_SET_LOG_FD: + r = -ENOIOCTLCMD; + break; + default: + mutex_lock(&v->vdev.mutex); + r = vhost_dev_ioctl(&v->vdev, cmd, argp); + if (r == -ENOIOCTLCMD) + r = vhost_vdpa_vring_ioctl(v, cmd, argp); + mutex_unlock(&v->vdev.mutex); + break; + } + + if (r) + goto out; + + switch (cmd) { + case VHOST_SET_MEM_TABLE: + if (ops->set_map) + r = ops->set_map(vdpa, v->vdev.umem); + else + r = vhost_vdpa_do_dma_mapping(v); + break; + } + +out: + mutex_unlock(&v->mutex); + return r; +} + +static const struct file_operations vhost_vdpa_fops = { + .owner = THIS_MODULE, + .open = vhost_vdpa_open, + .release = vhost_vdpa_release, + .unlocked_ioctl = vhost_vdpa_unlocked_ioctl, + .compat_ioctl = compat_ptr_ioctl, +}; + +static int vhost_vdpa_probe(struct device *dev) +{ + struct vdpa_device *vdpa = dev_to_vdpa(dev); + const struct vdpa_config_ops *ops = vdpa->config; + struct vhost_vdpa *v; + struct device *d; + int minor, nvqs; + int r; + + /* Currently, we only accept the network devices. */ + if (ops->get_device_id(vdpa) != VIRTIO_ID_NET) { + r = -ENOTSUPP; + goto err; + } + + v = kzalloc(sizeof(*v), GFP_KERNEL | __GFP_RETRY_MAYFAIL); + if (!v) { + r = -ENOMEM; + goto err; + } + + nvqs = VHOST_VDPA_VQ_MAX; + + v->vqs = kmalloc_array(nvqs, sizeof(struct vhost_virtqueue), + GFP_KERNEL); + if (!v->vqs) { + r = -ENOMEM; + goto err_alloc_vqs; + } + + mutex_init(&v->mutex); + atomic_set(&v->opened, 0); + + v->vdpa = vdpa; + v->nvqs = nvqs; + v->virtio_id = ops->get_device_id(vdpa); + + mutex_lock(&vhost_vdpa.mutex); + + minor = vhost_vdpa_alloc_minor(v); + if (minor < 0) { + r = minor; + goto err_alloc_minor; + } + + d = device_create(vhost_vdpa.class, NULL, + MKDEV(MAJOR(vhost_vdpa.devt), minor), + v, "%d", vdpa->index); + if (IS_ERR(d)) { + r = PTR_ERR(d); + goto err_device_create; + } + + mutex_unlock(&vhost_vdpa.mutex); + + v->dev = d; + v->minor = minor; + dev_set_drvdata(dev, v); + + return 0; + +err_device_create: + vhost_vdpa_free_minor(minor); +err_alloc_minor: + mutex_unlock(&vhost_vdpa.mutex); + kfree(v->vqs); +err_alloc_vqs: + kfree(v); +err: + return r; +} + +static void vhost_vdpa_remove(struct device *dev) +{ + DEFINE_WAIT_FUNC(wait, woken_wake_function); + struct vhost_vdpa *v = dev_get_drvdata(dev); + int opened; + + add_wait_queue(&vhost_vdpa.release_q, &wait); + + do { + opened = atomic_cmpxchg(&v->opened, 0, 1); + if (!opened) + break; + wait_woken(&wait, TASK_UNINTERRUPTIBLE, HZ * 10); + } while (1); + + remove_wait_queue(&vhost_vdpa.release_q, &wait); + + mutex_lock(&vhost_vdpa.mutex); + device_destroy(vhost_vdpa.class, + MKDEV(MAJOR(vhost_vdpa.devt), v->minor)); + vhost_vdpa_free_minor(v->minor); + mutex_unlock(&vhost_vdpa.mutex); + kfree(v->vqs); + kfree(v); +} + +static struct vdpa_driver vhost_vdpa_driver = { + .drv = { + .name = "vhost_vdpa", + }, + .probe = vhost_vdpa_probe, + .remove = vhost_vdpa_remove, +}; + +static char *vhost_vdpa_devnode(struct device *dev, umode_t *mode) +{ + return kasprintf(GFP_KERNEL, "vhost-vdpa/%s", dev_name(dev)); +} + +static int __init vhost_vdpa_init(void) +{ + int r; + + idr_init(&vhost_vdpa.idr); + mutex_init(&vhost_vdpa.mutex); + init_waitqueue_head(&vhost_vdpa.release_q); + + /* /dev/vhost-vdpa/$vdpa_device_index */ + vhost_vdpa.class = class_create(THIS_MODULE, "vhost-vdpa"); + if (IS_ERR(vhost_vdpa.class)) { + r = PTR_ERR(vhost_vdpa.class); + goto err_class; + } + + vhost_vdpa.class->devnode = vhost_vdpa_devnode; + + r = alloc_chrdev_region(&vhost_vdpa.devt, 0, MINORMASK + 1, + "vhost-vdpa"); + if (r) + goto err_alloc_chrdev; + + cdev_init(&vhost_vdpa.cdev, &vhost_vdpa_fops); + r = cdev_add(&vhost_vdpa.cdev, vhost_vdpa.devt, MINORMASK + 1); + if (r) + goto err_cdev_add; + + r = register_vdpa_driver(&vhost_vdpa_driver); + if (r) + goto err_register_vdpa_driver; + + return 0; + +err_register_vdpa_driver: + cdev_del(&vhost_vdpa.cdev); +err_cdev_add: + unregister_chrdev_region(vhost_vdpa.devt, MINORMASK + 1); +err_alloc_chrdev: + class_destroy(vhost_vdpa.class); +err_class: + idr_destroy(&vhost_vdpa.idr); + return r; +} +module_init(vhost_vdpa_init); + +static void __exit vhost_vdpa_exit(void) +{ + unregister_vdpa_driver(&vhost_vdpa_driver); + cdev_del(&vhost_vdpa.cdev); + unregister_chrdev_region(vhost_vdpa.devt, MINORMASK + 1); + class_destroy(vhost_vdpa.class); + idr_destroy(&vhost_vdpa.idr); +} +module_exit(vhost_vdpa_exit); + +MODULE_VERSION("0.0.1"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("vDPA based vhost backend for virtio"); diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index 40d028eed645..23f6db2106f5 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -116,4 +116,25 @@ #define VHOST_VSOCK_SET_GUEST_CID _IOW(VHOST_VIRTIO, 0x60, __u64) #define VHOST_VSOCK_SET_RUNNING _IOW(VHOST_VIRTIO, 0x61, int) +/* VHOST_VDPA specific defines */ + +/* Get the device id. The device ids follow the same definition of + * the device id defined in virtio-spec. */ +#define VHOST_VDPA_GET_DEVICE_ID _IOR(VHOST_VIRTIO, 0x70, __u32) +/* Get and set the status. The status bits follow the same definition + * of the device status defined in virtio-spec. */ +#define VHOST_VDPA_GET_STATUS _IOR(VHOST_VIRTIO, 0x71, __u8) +#define VHOST_VDPA_SET_STATUS _IOW(VHOST_VIRTIO, 0x72, __u8) +/* Get and set the device config. The device config follows the same + * definition of the device config defined in virtio-spec. */ +#define VHOST_VDPA_GET_CONFIG _IOR(VHOST_VIRTIO, 0x73, \ + struct vhost_vdpa_config) +#define VHOST_VDPA_SET_CONFIG _IOW(VHOST_VIRTIO, 0x74, \ + struct vhost_vdpa_config) +/* Enable/disable the ring. */ +#define VHOST_VDPA_SET_VRING_ENABLE _IOW(VHOST_VIRTIO, 0x75, \ + struct vhost_vring_state) +/* Get the max ring size. */ +#define VHOST_VDPA_GET_VRING_NUM _IOR(VHOST_VIRTIO, 0x76, __u16) + #endif diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h index c907290ff065..669457ce5c48 100644 --- a/include/uapi/linux/vhost_types.h +++ b/include/uapi/linux/vhost_types.h @@ -119,6 +119,14 @@ struct vhost_scsi_target { unsigned short reserved; }; +/* VHOST_VDPA specific definitions */ + +struct vhost_vdpa_config { + __u32 off; + __u32 len; + __u8 buf[0]; +}; + /* Feature bits */ /* Log all write descriptors. Can be changed while device is active. */ #define VHOST_F_LOG_ALL 26 -- 2.24.1 _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
