vdpa.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2018-2020 Intel Corporation.
 * Copyright (C) 2020 Red Hat, Inc.
 *
 * Author: Tiwei Bie <tiwei.bie@intel.com>
 *         Jason Wang <jasowang@redhat.com>
 *
 * Thanks 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/mm.h>
#include <linux/slab.h>
#include <linux/iommu.h>
#include <linux/uuid.h>
#include <linux/vdpa.h>
#include <linux/nospec.h>
#include <linux/vhost.h>

#include "vhost.h"

enum {
	VHOST_VDPA_BACKEND_FEATURES =
	(1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2) |
	(1ULL << VHOST_BACKEND_F_IOTLB_BATCH) |
	(1ULL << VHOST_BACKEND_F_IOTLB_ASID),
};

#define VHOST_VDPA_DEV_MAX (1U << MINORBITS)

#define VHOST_VDPA_IOTLB_BUCKETS 16

struct vhost_vdpa_as {
	struct hlist_node hash_link;
	struct vhost_iotlb iotlb;
	u32 id;
};

struct vhost_vdpa {
	struct vhost_dev vdev;
	struct iommu_domain *domain;
	struct vhost_virtqueue *vqs;
	struct completion completion;
	struct vdpa_device *vdpa;
	struct hlist_head as[VHOST_VDPA_IOTLB_BUCKETS];
	struct device dev;
	struct cdev cdev;
	atomic_t opened;
	u32 nvqs;
	int virtio_id;
	int minor;
	struct eventfd_ctx *config_ctx;
	int in_batch;
	struct vdpa_iova_range range;
	u32 batch_asid;
	bool suspended;
};

static DEFINE_IDA(vhost_vdpa_ida);

static dev_t vhost_vdpa_major;

static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v,
				   struct vhost_iotlb *iotlb, u64 start,
				   u64 last, u32 asid);

static inline u32 iotlb_to_asid(struct vhost_iotlb *iotlb)
{
	struct vhost_vdpa_as *as = container_of(iotlb, struct
						vhost_vdpa_as, iotlb);
	return as->id;
}

static struct vhost_vdpa_as *asid_to_as(struct vhost_vdpa *v, u32 asid)
{
	struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS];
	struct vhost_vdpa_as *as;

	hlist_for_each_entry(as, head, hash_link)
		if (as->id == asid)
			return as;

	return NULL;
}

static struct vhost_iotlb *asid_to_iotlb(struct vhost_vdpa *v, u32 asid)
{
	struct vhost_vdpa_as *as = asid_to_as(v, asid);

	if (!as)
		return NULL;

	return &as->iotlb;
}

static struct vhost_vdpa_as *vhost_vdpa_alloc_as(struct vhost_vdpa *v, u32 asid)
{
	struct hlist_head *head = &v->as[asid % VHOST_VDPA_IOTLB_BUCKETS];
	struct vhost_vdpa_as *as;

	if (asid_to_as(v, asid))
		return NULL;

	if (asid >= v->vdpa->nas)
		return NULL;

	as = kmalloc(sizeof(*as), GFP_KERNEL);
	if (!as)
		return NULL;

	vhost_iotlb_init(&as->iotlb, 0, 0);
	as->id = asid;
	hlist_add_head(&as->hash_link, head);

	return as;
}

static struct vhost_vdpa_as *vhost_vdpa_find_alloc_as(struct vhost_vdpa *v,
						      u32 asid)
{
	struct vhost_vdpa_as *as = asid_to_as(v, asid);

	if (as)
		return as;

	return vhost_vdpa_alloc_as(v, asid);
}

static void vhost_vdpa_reset_map(struct vhost_vdpa *v, u32 asid)
{
	struct vdpa_device *vdpa = v->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;

	if (ops->reset_map)
		ops->reset_map(vdpa, asid);
}

static int vhost_vdpa_remove_as(struct vhost_vdpa *v, u32 asid)
{
	struct vhost_vdpa_as *as = asid_to_as(v, asid);

	if (!as)
		return -EINVAL;

	hlist_del(&as->hash_link);
	vhost_vdpa_iotlb_unmap(v, &as->iotlb, 0ULL, 0ULL - 1, asid);
	/*
	 * Devices with vendor specific IOMMU may need to restore
	 * iotlb to the initial or default state, which cannot be
	 * cleaned up in the all range unmap call above. Give them
	 * a chance to clean up or reset the map to the desired
	 * state.
	 */
	vhost_vdpa_reset_map(v, asid);
	kfree(as);

	return 0;
}

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.ctx;

	if (call_ctx)
		eventfd_signal(call_ctx);

	return IRQ_HANDLED;
}

static irqreturn_t vhost_vdpa_config_cb(void *private)
{
	struct vhost_vdpa *v = private;
	struct eventfd_ctx *config_ctx = v->config_ctx;

	if (config_ctx)
		eventfd_signal(config_ctx);

	return IRQ_HANDLED;
}

static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid)
{
	struct vhost_virtqueue *vq = &v->vqs[qid];
	const struct vdpa_config_ops *ops = v->vdpa->config;
	struct vdpa_device *vdpa = v->vdpa;
	int ret, irq;

	if (!ops->get_vq_irq)
		return;

	irq = ops->get_vq_irq(vdpa, qid);
	if (irq < 0)
		return;

	irq_bypass_unregister_producer(&vq->call_ctx.producer);
	if (!vq->call_ctx.ctx)
		return;

	vq->call_ctx.producer.token = vq->call_ctx.ctx;
	vq->call_ctx.producer.irq = irq;
	ret = irq_bypass_register_producer(&vq->call_ctx.producer);
	if (unlikely(ret))
		dev_info(&v->dev, "vq %u, irq bypass producer (token %p) registration fails, ret =  %d\n",
			 qid, vq->call_ctx.producer.token, ret);
}

static void vhost_vdpa_unsetup_vq_irq(struct vhost_vdpa *v, u16 qid)
{
	struct vhost_virtqueue *vq = &v->vqs[qid];

	irq_bypass_unregister_producer(&vq->call_ctx.producer);
}

static int _compat_vdpa_reset(struct vhost_vdpa *v)
{
	struct vdpa_device *vdpa = v->vdpa;
	u32 flags = 0;

	v->suspended = false;

	if (v->vdev.vqs) {
		flags |= !vhost_backend_has_feature(v->vdev.vqs[0],
						    VHOST_BACKEND_F_IOTLB_PERSIST) ?
			 VDPA_RESET_F_CLEAN_MAP : 0;
	}

	return vdpa_reset(vdpa, flags);
}

static int vhost_vdpa_reset(struct vhost_vdpa *v)
{
	v->in_batch = 0;
	return _compat_vdpa_reset(v);
}

static long vhost_vdpa_bind_mm(struct vhost_vdpa *v)
{
	struct vdpa_device *vdpa = v->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;

	if (!vdpa->use_va || !ops->bind_mm)
		return 0;

	return ops->bind_mm(vdpa, v->vdev.mm);
}

static void vhost_vdpa_unbind_mm(struct vhost_vdpa *v)
{
	struct vdpa_device *vdpa = v->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;

	if (!vdpa->use_va || !ops->unbind_mm)
		return;

	ops->unbind_mm(vdpa);
}

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, status_old;
	u32 nvqs = v->nvqs;
	int ret;
	u16 i;

	if (copy_from_user(&status, statusp, sizeof(status)))
		return -EFAULT;

	status_old = ops->get_status(vdpa);

	/*
	 * Userspace shouldn't remove status bits unless reset the
	 * status to 0.
	 */
	if (status != 0 && (status_old & ~status) != 0)
		return -EINVAL;

	if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && !(status & VIRTIO_CONFIG_S_DRIVER_OK))
		for (i = 0; i < nvqs; i++)
			vhost_vdpa_unsetup_vq_irq(v, i);

	if (status == 0) {
		ret = _compat_vdpa_reset(v);
		if (ret)
			return ret;
	} else
		vdpa_set_status(vdpa, status);

	if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && !(status_old & VIRTIO_CONFIG_S_DRIVER_OK))
		for (i = 0; i < nvqs; i++)
			vhost_vdpa_setup_vq_irq(v, i);

	return 0;
}

static int vhost_vdpa_config_validate(struct vhost_vdpa *v,
				      struct vhost_vdpa_config *c)
{
	struct vdpa_device *vdpa = v->vdpa;
	size_t size = vdpa->config->get_config_size(vdpa);

	if (c->len == 0 || c->off > size)
		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;
	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;

	vdpa_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;
	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 = vmemdup_user(c->buf, config.len);
	if (IS_ERR(buf))
		return PTR_ERR(buf);

	vdpa_set_config(vdpa, config.off, buf, config.len);

	kvfree(buf);
	return 0;
}

static bool vhost_vdpa_can_suspend(const struct vhost_vdpa *v)
{
	struct vdpa_device *vdpa = v->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;

	return ops->suspend;
}

static bool vhost_vdpa_can_resume(const struct vhost_vdpa *v)
{
	struct vdpa_device *vdpa = v->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;

	return ops->resume;
}

static bool vhost_vdpa_has_desc_group(const struct vhost_vdpa *v)
{
	struct vdpa_device *vdpa = v->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;

	return ops->get_vq_desc_group;
}

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_device_features(vdpa);

	if (copy_to_user(featurep, &features, sizeof(features)))
		return -EFAULT;

	return 0;
}

static u64 vhost_vdpa_get_backend_features(const struct vhost_vdpa *v)
{
	struct vdpa_device *vdpa = v->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;

	if (!ops->get_backend_features)
		return 0;
	else
		return ops->get_backend_features(vdpa);
}

static bool vhost_vdpa_has_persistent_map(const struct vhost_vdpa *v)
{
	struct vdpa_device *vdpa = v->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;

	return (!ops->set_map && !ops->dma_map) || ops->reset_map ||
	       vhost_vdpa_get_backend_features(v) & BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST);
}

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;
	struct vhost_dev *d = &v->vdev;
	u64 actual_features;
	u64 features;
	int i;

	/*
	 * 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 (vdpa_set_features(vdpa, features))
		return -EINVAL;

	/* let the vqs know what has been configured */
	actual_features = ops->get_driver_features(vdpa);
	for (i = 0; i < d->nvqs; ++i) {
		struct vhost_virtqueue *vq = d->vqs[i];

		mutex_lock(&vq->mutex);
		vq->acked_features = actual_features;
		mutex_unlock(&vq->mutex);
	}

	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 void vhost_vdpa_config_put(struct vhost_vdpa *v)
{
	if (v->config_ctx) {
		eventfd_ctx_put(v->config_ctx);
		v->config_ctx = NULL;
	}
}

static long vhost_vdpa_set_config_call(struct vhost_vdpa *v, u32 __user *argp)
{
	struct vdpa_callback cb;
	int fd;
	struct eventfd_ctx *ctx;

	cb.callback = vhost_vdpa_config_cb;
	cb.private = v;
	if (copy_from_user(&fd, argp, sizeof(fd)))
		return  -EFAULT;

	ctx = fd == VHOST_FILE_UNBIND ? NULL : eventfd_ctx_fdget(fd);
	swap(ctx, v->config_ctx);

	if (!IS_ERR_OR_NULL(ctx))
		eventfd_ctx_put(ctx);

	if (IS_ERR(v->config_ctx)) {
		long ret = PTR_ERR(v->config_ctx);

		v->config_ctx = NULL;
		return ret;
	}

	v->vdpa->config->set_config_cb(v->vdpa, &cb);

	return 0;
}

static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp)
{
	struct vhost_vdpa_iova_range range = {
		.first = v->range.first,
		.last = v->range.last,
	};

	if (copy_to_user(argp, &range, sizeof(range)))
		return -EFAULT;
	return 0;
}

static long vhost_vdpa_get_config_size(struct vhost_vdpa *v, u32 __user *argp)
{
	struct vdpa_device *vdpa = v->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;
	u32 size;

	size = ops->get_config_size(vdpa);

	if (copy_to_user(argp, &size, sizeof(size)))
		return -EFAULT;

	return 0;
}

static long vhost_vdpa_get_vqs_count(struct vhost_vdpa *v, u32 __user *argp)
{
	struct vdpa_device *vdpa = v->vdpa;

	if (copy_to_user(argp, &vdpa->nvqs, sizeof(vdpa->nvqs)))
		return -EFAULT;

	return 0;
}

/* After a successful return of ioctl the device must not process more
 * virtqueue descriptors. The device can answer to read or writes of config
 * fields as if it were not suspended. In particular, writing to "queue_enable"
 * with a value of 1 will not make the device start processing buffers.
 */
static long vhost_vdpa_suspend(struct vhost_vdpa *v)
{
	struct vdpa_device *vdpa = v->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;
	int ret;

	if (!(ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK))
		return 0;

	if (!ops->suspend)
		return -EOPNOTSUPP;

	ret = ops->suspend(vdpa);
	if (!ret)
		v->suspended = true;

	return ret;
}

/* After a successful return of this ioctl the device resumes processing
 * virtqueue descriptors. The device becomes fully operational the same way it
 * was before it was suspended.
 */
static long vhost_vdpa_resume(struct vhost_vdpa *v)
{
	struct vdpa_device *vdpa = v->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;
	int ret;

	if (!(ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK))
		return 0;

	if (!ops->resume)
		return -EOPNOTSUPP;

	ret = ops->resume(vdpa);
	if (!ret)
		v->suspended = false;

	return ret;
}

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_vq_state vq_state;
	struct vdpa_callback cb;
	struct vhost_virtqueue *vq;
	struct vhost_vring_state s;
	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];

	switch (cmd) {
	case 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;
	case VHOST_VDPA_GET_VRING_GROUP:
		if (!ops->get_vq_group)
			return -EOPNOTSUPP;
		s.index = idx;
		s.num = ops->get_vq_group(vdpa, idx);
		if (s.num >= vdpa->ngroups)
			return -EIO;
		else if (copy_to_user(argp, &s, sizeof(s)))
			return -EFAULT;
		return 0;
	case VHOST_VDPA_GET_VRING_DESC_GROUP:
		if (!vhost_vdpa_has_desc_group(v))
			return -EOPNOTSUPP;
		s.index = idx;
		s.num = ops->get_vq_desc_group(vdpa, idx);
		if (s.num >= vdpa->ngroups)
			return -EIO;
		else if (copy_to_user(argp, &s, sizeof(s)))
			return -EFAULT;
		return 0;
	case VHOST_VDPA_SET_GROUP_ASID:
		if (copy_from_user(&s, argp, sizeof(s)))
			return -EFAULT;
		if (s.num >= vdpa->nas)
			return -EINVAL;
		if (!ops->set_group_asid)
			return -EOPNOTSUPP;
		return ops->set_group_asid(vdpa, idx, s.num);
	case VHOST_VDPA_GET_VRING_SIZE:
		if (!ops->get_vq_size)
			return -EOPNOTSUPP;
		s.index = idx;
		s.num = ops->get_vq_size(vdpa, idx);
		if (copy_to_user(argp, &s, sizeof(s)))
			return -EFAULT;
		return 0;
	case VHOST_GET_VRING_BASE:
		r = ops->get_vq_state(v->vdpa, idx, &vq_state);
		if (r)
			return r;

		if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {
			vq->last_avail_idx = vq_state.packed.last_avail_idx |
					     (vq_state.packed.last_avail_counter << 15);
			vq->last_used_idx = vq_state.packed.last_used_idx |
					    (vq_state.packed.last_used_counter << 15);
		} else {
			vq->last_avail_idx = vq_state.split.avail_index;
		}
		break;
	}

	r = vhost_vring_ioctl(&v->vdev, cmd, argp);
	if (r)
		return r;

	switch (cmd) {
	case VHOST_SET_VRING_ADDR:
		if ((ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK) && !v->suspended)
			return -EINVAL;

		if (ops->set_vq_address(vdpa, idx,
					(u64)(uintptr_t)vq->desc,
					(u64)(uintptr_t)vq->avail,
					(u64)(uintptr_t)vq->used))
			r = -EINVAL;
		break;

	case VHOST_SET_VRING_BASE:
		if ((ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK) && !v->suspended)
			return -EINVAL;

		if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {
			vq_state.packed.last_avail_idx = vq->last_avail_idx & 0x7fff;
			vq_state.packed.last_avail_counter = !!(vq->last_avail_idx & 0x8000);
			vq_state.packed.last_used_idx = vq->last_used_idx & 0x7fff;
			vq_state.packed.last_used_counter = !!(vq->last_used_idx & 0x8000);
		} else {
			vq_state.split.avail_index = vq->last_avail_idx;
		}
		r = ops->set_vq_state(vdpa, idx, &vq_state);
		break;

	case VHOST_SET_VRING_CALL:
		if (vq->call_ctx.ctx) {
			cb.callback = vhost_vdpa_virtqueue_cb;
			cb.private = vq;
			cb.trigger = vq->call_ctx.ctx;
		} else {
			cb.callback = NULL;
			cb.private = NULL;
			cb.trigger = NULL;
		}
		ops->set_vq_cb(vdpa, idx, &cb);
		vhost_vdpa_setup_vq_irq(v, idx);
		break;

	case VHOST_SET_VRING_NUM:
		ops->set_vq_num(vdpa, idx, vq->num);
		break;
	}

	return r;
}

static long vhost_vdpa_unlocked_ioctl(struct file *filep,
				      unsigned int cmd, unsigned long arg)
{
	struct vhost_vdpa *v = filep->private_data;
	struct vhost_dev *d = &v->vdev;
	void __user *argp = (void __user *)arg;
	u64 __user *featurep = argp;
	u64 features;
	long r = 0;

	if (cmd == VHOST_SET_BACKEND_FEATURES) {
		if (copy_from_user(&features, featurep, sizeof(features)))
			return -EFAULT;
		if (features & ~(VHOST_VDPA_BACKEND_FEATURES |
				 BIT_ULL(VHOST_BACKEND_F_DESC_ASID) |
				 BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST) |
				 BIT_ULL(VHOST_BACKEND_F_SUSPEND) |
				 BIT_ULL(VHOST_BACKEND_F_RESUME) |
				 BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK)))
			return -EOPNOTSUPP;
		if ((features & BIT_ULL(VHOST_BACKEND_F_SUSPEND)) &&
		     !vhost_vdpa_can_suspend(v))
			return -EOPNOTSUPP;
		if ((features & BIT_ULL(VHOST_BACKEND_F_RESUME)) &&
		     !vhost_vdpa_can_resume(v))
			return -EOPNOTSUPP;
		if ((features & BIT_ULL(VHOST_BACKEND_F_DESC_ASID)) &&
		    !(features & BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID)))
			return -EINVAL;
		if ((features & BIT_ULL(VHOST_BACKEND_F_DESC_ASID)) &&
		     !vhost_vdpa_has_desc_group(v))
			return -EOPNOTSUPP;
		if ((features & BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST)) &&
		     !vhost_vdpa_has_persistent_map(v))
			return -EOPNOTSUPP;
		vhost_set_backend_features(&v->vdev, features);
		return 0;
	}

	mutex_lock(&d->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_VDPA_GET_GROUP_NUM:
		if (copy_to_user(argp, &v->vdpa->ngroups,
				 sizeof(v->vdpa->ngroups)))
			r = -EFAULT;
		break;
	case VHOST_VDPA_GET_AS_NUM:
		if (copy_to_user(argp, &v->vdpa->nas, sizeof(v->vdpa->nas)))
			r = -EFAULT;
		break;
	case VHOST_SET_LOG_BASE:
	case VHOST_SET_LOG_FD:
		r = -ENOIOCTLCMD;
		break;
	case VHOST_VDPA_SET_CONFIG_CALL:
		r = vhost_vdpa_set_config_call(v, argp);
		break;
	case VHOST_GET_BACKEND_FEATURES:
		features = VHOST_VDPA_BACKEND_FEATURES;
		if (vhost_vdpa_can_suspend(v))
			features |= BIT_ULL(VHOST_BACKEND_F_SUSPEND);
		if (vhost_vdpa_can_resume(v))
			features |= BIT_ULL(VHOST_BACKEND_F_RESUME);
		if (vhost_vdpa_has_desc_group(v))
			features |= BIT_ULL(VHOST_BACKEND_F_DESC_ASID);
		if (vhost_vdpa_has_persistent_map(v))
			features |= BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST);
		features |= vhost_vdpa_get_backend_features(v);
		if (copy_to_user(featurep, &features, sizeof(features)))
			r = -EFAULT;
		break;
	case VHOST_VDPA_GET_IOVA_RANGE:
		r = vhost_vdpa_get_iova_range(v, argp);
		break;
	case VHOST_VDPA_GET_CONFIG_SIZE:
		r = vhost_vdpa_get_config_size(v, argp);
		break;
	case VHOST_VDPA_GET_VQS_COUNT:
		r = vhost_vdpa_get_vqs_count(v, argp);
		break;
	case VHOST_VDPA_SUSPEND:
		r = vhost_vdpa_suspend(v);
		break;
	case VHOST_VDPA_RESUME:
		r = vhost_vdpa_resume(v);
		break;
	default:
		r = vhost_dev_ioctl(&v->vdev, cmd, argp);
		if (r == -ENOIOCTLCMD)
			r = vhost_vdpa_vring_ioctl(v, cmd, argp);
		break;
	}

	if (r)
		goto out;

	switch (cmd) {
	case VHOST_SET_OWNER:
		r = vhost_vdpa_bind_mm(v);
		if (r)
			vhost_dev_reset_owner(d, NULL);
		break;
	}
out:
	mutex_unlock(&d->mutex);
	return r;
}
static void vhost_vdpa_general_unmap(struct vhost_vdpa *v,
				     struct vhost_iotlb_map *map, u32 asid)
{
	struct vdpa_device *vdpa = v->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;
	if (ops->dma_map) {
		ops->dma_unmap(vdpa, asid, map->start, map->size);
	} else if (ops->set_map == NULL) {
		iommu_unmap(v->domain, map->start, map->size);
	}
}

static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
				u64 start, u64 last, u32 asid)
{
	struct vhost_dev *dev = &v->vdev;
	struct vhost_iotlb_map *map;
	struct page *page;
	unsigned long pfn, pinned;

	while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) {
		pinned = PFN_DOWN(map->size);
		for (pfn = PFN_DOWN(map->addr);
		     pinned > 0; pfn++, pinned--) {
			page = pfn_to_page(pfn);
			if (map->perm & VHOST_ACCESS_WO)
				set_page_dirty_lock(page);
			unpin_user_page(page);
		}
		atomic64_sub(PFN_DOWN(map->size), &dev->mm->pinned_vm);
		vhost_vdpa_general_unmap(v, map, asid);
		vhost_iotlb_map_free(iotlb, map);
	}
}

static void vhost_vdpa_va_unmap(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
				u64 start, u64 last, u32 asid)
{
	struct vhost_iotlb_map *map;
	struct vdpa_map_file *map_file;

	while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) {
		map_file = (struct vdpa_map_file *)map->opaque;
		fput(map_file->file);
		kfree(map_file);
		vhost_vdpa_general_unmap(v, map, asid);
		vhost_iotlb_map_free(iotlb, map);
	}
}

static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v,
				   struct vhost_iotlb *iotlb, u64 start,
				   u64 last, u32 asid)
{
	struct vdpa_device *vdpa = v->vdpa;

	if (vdpa->use_va)
		return vhost_vdpa_va_unmap(v, iotlb, start, last, asid);

	return vhost_vdpa_pa_unmap(v, iotlb, start, last, asid);
}

static int perm_to_iommu_flags(u32 perm)
{
	int flags = 0;

	switch (perm) {
	case VHOST_ACCESS_WO:
		flags |= IOMMU_WRITE;
		break;
	case VHOST_ACCESS_RO:
		flags |= IOMMU_READ;
		break;
	case VHOST_ACCESS_RW:
		flags |= (IOMMU_WRITE | IOMMU_READ);
		break;
	default:
		WARN(1, "invalidate vhost IOTLB permission\n");
		break;
	}

	return flags | IOMMU_CACHE;
}

static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
			  u64 iova, u64 size, u64 pa, u32 perm, void *opaque)
{
	struct vhost_dev *dev = &v->vdev;
	struct vdpa_device *vdpa = v->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;
	u32 asid = iotlb_to_asid(iotlb);
	int r = 0;

	r = vhost_iotlb_add_range_ctx(iotlb, iova, iova + size - 1,
				      pa, perm, opaque);
	if (r)
		return r;

	if (ops->dma_map) {
		r = ops->dma_map(vdpa, asid, iova, size, pa, perm, opaque);
	} else if (ops->set_map) {
		if (!v->in_batch)