mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Eli Cohen](/assets/img/avatar_default.png)
Call reset using the wrapper function vdpa_reset() to make sure the operation is serialized with cf_mutex. This comes to protect from the following possible scenario: vhost_vdpa_set_status() could call the reset op. Since the call is not protected by cf_mutex, a netlink thread calling vdpa_dev_config_fill could get passed the VIRTIO_CONFIG_S_FEATURES_OK check in vdpa_dev_config_fill() and end up reporting wrong features. Fixes: 5f6e85953d8f ("vdpa: Read device configuration only if FEATURES_OK") Signed-off-by: Eli Cohen <elic@nvidia.com> Link: https://lore.kernel.org/r/20220111183400.38418-3-elic@nvidia.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Si-Wei Liu<si-wei.liu@oracle.com> Acked-by: Jason Wang <jasowang@redhat.com>
1228 lines
27 KiB
C
1228 lines
27 KiB
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),
|
|
};
|
|
|
|
#define VHOST_VDPA_DEV_MAX (1U << MINORBITS)
|
|
|
|
struct vhost_vdpa {
|
|
struct vhost_dev vdev;
|
|
struct iommu_domain *domain;
|
|
struct vhost_virtqueue *vqs;
|
|
struct completion completion;
|
|
struct vdpa_device *vdpa;
|
|
struct device dev;
|
|
struct cdev cdev;
|
|
atomic_t opened;
|
|
int nvqs;
|
|
int virtio_id;
|
|
int minor;
|
|
struct eventfd_ctx *config_ctx;
|
|
int in_batch;
|
|
struct vdpa_iova_range range;
|
|
};
|
|
|
|
static DEFINE_IDA(vhost_vdpa_ida);
|
|
|
|
static dev_t vhost_vdpa_major;
|
|
|
|
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, 1);
|
|
|
|
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, 1);
|
|
|
|
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);
|
|
irq_bypass_unregister_producer(&vq->call_ctx.producer);
|
|
if (!vq->call_ctx.ctx || irq < 0)
|
|
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 vhost_vdpa_reset(struct vhost_vdpa *v)
|
|
{
|
|
struct vdpa_device *vdpa = v->vdpa;
|
|
|
|
v->in_batch = 0;
|
|
|
|
return vdpa_reset(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;
|
|
int ret, nvqs = v->nvqs;
|
|
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 = vdpa_reset(vdpa);
|
|
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 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 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 (vdpa_set_features(vdpa, features, false))
|
|
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 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_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_GET_VRING_BASE:
|
|
r = ops->get_vq_state(v->vdpa, idx, &vq_state);
|
|
if (r)
|
|
return r;
|
|
|
|
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->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:
|
|
vq_state.split.avail_index = vq->last_avail_idx;
|
|
if (ops->set_vq_state(vdpa, idx, &vq_state))
|
|
r = -EINVAL;
|
|
break;
|
|
|
|
case VHOST_SET_VRING_CALL:
|
|
if (vq->call_ctx.ctx) {
|
|
cb.callback = vhost_vdpa_virtqueue_cb;
|
|
cb.private = vq;
|
|
} else {
|
|
cb.callback = NULL;
|
|
cb.private = 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)
|
|
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_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 (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;
|
|
default:
|
|
r = vhost_dev_ioctl(&v->vdev, cmd, argp);
|
|
if (r == -ENOIOCTLCMD)
|
|
r = vhost_vdpa_vring_ioctl(v, cmd, argp);
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&d->mutex);
|
|
return r;
|
|
}
|
|
|
|
static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v, u64 start, u64 last)
|
|
{
|
|
struct vhost_dev *dev = &v->vdev;
|
|
struct vhost_iotlb *iotlb = dev->iotlb;
|
|
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_iotlb_map_free(iotlb, map);
|
|
}
|
|
}
|
|
|
|
static void vhost_vdpa_va_unmap(struct vhost_vdpa *v, u64 start, u64 last)
|
|
{
|
|
struct vhost_dev *dev = &v->vdev;
|
|
struct vhost_iotlb *iotlb = dev->iotlb;
|
|
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_iotlb_map_free(iotlb, map);
|
|
}
|
|
}
|
|
|
|
static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v, u64 start, u64 last)
|
|
{
|
|
struct vdpa_device *vdpa = v->vdpa;
|
|
|
|
if (vdpa->use_va)
|
|
return vhost_vdpa_va_unmap(v, start, last);
|
|
|
|
return vhost_vdpa_pa_unmap(v, start, last);
|
|
}
|
|
|
|
static void vhost_vdpa_iotlb_free(struct vhost_vdpa *v)
|
|
{
|
|
struct vhost_dev *dev = &v->vdev;
|
|
|
|
vhost_vdpa_iotlb_unmap(v, 0ULL, 0ULL - 1);
|
|
kfree(dev->iotlb);
|
|
dev->iotlb = NULL;
|
|
}
|
|
|
|
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, 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;
|
|
int r = 0;
|
|
|
|
r = vhost_iotlb_add_range_ctx(dev->iotlb, iova, iova + size - 1,
|
|
pa, perm, opaque);
|
|
if (r)
|
|
return r;
|
|
|
|
if (ops->dma_map) {
|
|
r = ops->dma_map(vdpa, iova, size, pa, perm, opaque);
|
|
} else if (ops->set_map) {
|
|
if (!v->in_batch)
|
|
r = ops->set_map(vdpa, dev->iotlb);
|
|
} else {
|
|
r = iommu_map(v->domain, iova, pa, size,
|
|
perm_to_iommu_flags(perm));
|
|
}
|
|
if (r) {
|
|
vhost_iotlb_del_range(dev->iotlb, iova, iova + size - 1);
|
|
return r;
|
|
}
|
|
|
|
if (!vdpa->use_va)
|
|
atomic64_add(PFN_DOWN(size), &dev->mm->pinned_vm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vhost_vdpa_unmap(struct vhost_vdpa *v, u64 iova, u64 size)
|
|
{
|
|
struct vhost_dev *dev = &v->vdev;
|
|
struct vdpa_device *vdpa = v->vdpa;
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
|
|
vhost_vdpa_iotlb_unmap(v, iova, iova + size - 1);
|
|
|
|
if (ops->dma_map) {
|
|
ops->dma_unmap(vdpa, iova, size);
|
|
} else if (ops->set_map) {
|
|
if (!v->in_batch)
|
|
ops->set_map(vdpa, dev->iotlb);
|
|
} else {
|
|
iommu_unmap(v->domain, iova, size);
|
|
}
|
|
}
|
|
|
|
static int vhost_vdpa_va_map(struct vhost_vdpa *v,
|
|
u64 iova, u64 size, u64 uaddr, u32 perm)
|
|
{
|
|
struct vhost_dev *dev = &v->vdev;
|
|
u64 offset, map_size, map_iova = iova;
|
|
struct vdpa_map_file *map_file;
|
|
struct vm_area_struct *vma;
|
|
int ret = 0;
|
|
|
|
mmap_read_lock(dev->mm);
|
|
|
|
while (size) {
|
|
vma = find_vma(dev->mm, uaddr);
|
|
if (!vma) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
map_size = min(size, vma->vm_end - uaddr);
|
|
if (!(vma->vm_file && (vma->vm_flags & VM_SHARED) &&
|
|
!(vma->vm_flags & (VM_IO | VM_PFNMAP))))
|
|
goto next;
|
|
|
|
map_file = kzalloc(sizeof(*map_file), GFP_KERNEL);
|
|
if (!map_file) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
offset = (vma->vm_pgoff << PAGE_SHIFT) + uaddr - vma->vm_start;
|
|
map_file->offset = offset;
|
|
map_file->file = get_file(vma->vm_file);
|
|
ret = vhost_vdpa_map(v, map_iova, map_size, uaddr,
|
|
perm, map_file);
|
|
if (ret) {
|
|
fput(map_file->file);
|
|
kfree(map_file);
|
|
break;
|
|
}
|
|
next:
|
|
size -= map_size;
|
|
uaddr += map_size;
|
|
map_iova += map_size;
|
|
}
|
|
if (ret)
|
|
vhost_vdpa_unmap(v, iova, map_iova - iova);
|
|
|
|
mmap_read_unlock(dev->mm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int vhost_vdpa_pa_map(struct vhost_vdpa *v,
|
|
u64 iova, u64 size, u64 uaddr, u32 perm)
|
|
{
|
|
struct vhost_dev *dev = &v->vdev;
|
|
struct page **page_list;
|
|
unsigned long list_size = PAGE_SIZE / sizeof(struct page *);
|
|
unsigned int gup_flags = FOLL_LONGTERM;
|
|
unsigned long npages, cur_base, map_pfn, last_pfn = 0;
|
|
unsigned long lock_limit, sz2pin, nchunks, i;
|
|
u64 start = iova;
|
|
long pinned;
|
|
int ret = 0;
|
|
|
|
/* Limit the use of memory for bookkeeping */
|
|
page_list = (struct page **) __get_free_page(GFP_KERNEL);
|
|
if (!page_list)
|
|
return -ENOMEM;
|
|
|
|
if (perm & VHOST_ACCESS_WO)
|
|
gup_flags |= FOLL_WRITE;
|
|
|
|
npages = PFN_UP(size + (iova & ~PAGE_MASK));
|
|
if (!npages) {
|
|
ret = -EINVAL;
|
|
goto free;
|
|
}
|
|
|
|
mmap_read_lock(dev->mm);
|
|
|
|
lock_limit = PFN_DOWN(rlimit(RLIMIT_MEMLOCK));
|
|
if (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit) {
|
|
ret = -ENOMEM;
|
|
goto unlock;
|
|
}
|
|
|
|
cur_base = uaddr & PAGE_MASK;
|
|
iova &= PAGE_MASK;
|
|
nchunks = 0;
|
|
|
|
while (npages) {
|
|
sz2pin = min_t(unsigned long, npages, list_size);
|
|
pinned = pin_user_pages(cur_base, sz2pin,
|
|
gup_flags, page_list, NULL);
|
|
if (sz2pin != pinned) {
|
|
if (pinned < 0) {
|
|
ret = pinned;
|
|
} else {
|
|
unpin_user_pages(page_list, pinned);
|
|
ret = -ENOMEM;
|
|
}
|
|
goto out;
|
|
}
|
|
nchunks++;
|
|
|
|
if (!last_pfn)
|
|
map_pfn = page_to_pfn(page_list[0]);
|
|
|
|
for (i = 0; i < pinned; i++) {
|
|
unsigned long this_pfn = page_to_pfn(page_list[i]);
|
|
u64 csize;
|
|
|
|
if (last_pfn && (this_pfn != last_pfn + 1)) {
|
|
/* Pin a contiguous chunk of memory */
|
|
csize = PFN_PHYS(last_pfn - map_pfn + 1);
|
|
ret = vhost_vdpa_map(v, iova, csize,
|
|
PFN_PHYS(map_pfn),
|
|
perm, NULL);
|
|
if (ret) {
|
|
/*
|
|
* Unpin the pages that are left unmapped
|
|
* from this point on in the current
|
|
* page_list. The remaining outstanding
|
|
* ones which may stride across several
|
|
* chunks will be covered in the common
|
|
* error path subsequently.
|
|
*/
|
|
unpin_user_pages(&page_list[i],
|
|
pinned - i);
|
|
goto out;
|
|
}
|
|
|
|
map_pfn = this_pfn;
|
|
iova += csize;
|
|
nchunks = 0;
|
|
}
|
|
|
|
last_pfn = this_pfn;
|
|
}
|
|
|
|
cur_base += PFN_PHYS(pinned);
|
|
npages -= pinned;
|
|
}
|
|
|
|
/* Pin the rest chunk */
|
|
ret = vhost_vdpa_map(v, iova, PFN_PHYS(last_pfn - map_pfn + 1),
|
|
PFN_PHYS(map_pfn), perm, NULL);
|
|
out:
|
|
if (ret) {
|
|
if (nchunks) {
|
|
unsigned long pfn;
|
|
|
|
/*
|
|
* Unpin the outstanding pages which are yet to be
|
|
* mapped but haven't due to vdpa_map() or
|
|
* pin_user_pages() failure.
|
|
*
|
|
* Mapped pages are accounted in vdpa_map(), hence
|
|
* the corresponding unpinning will be handled by
|
|
* vdpa_unmap().
|
|
*/
|
|
WARN_ON(!last_pfn);
|
|
for (pfn = map_pfn; pfn <= last_pfn; pfn++)
|
|
unpin_user_page(pfn_to_page(pfn));
|
|
}
|
|
vhost_vdpa_unmap(v, start, size);
|
|
}
|
|
unlock:
|
|
mmap_read_unlock(dev->mm);
|
|
free:
|
|
free_page((unsigned long)page_list);
|
|
return ret;
|
|
|
|
}
|
|
|
|
static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
|
|
struct vhost_iotlb_msg *msg)
|
|
{
|
|
struct vhost_dev *dev = &v->vdev;
|
|
struct vdpa_device *vdpa = v->vdpa;
|
|
struct vhost_iotlb *iotlb = dev->iotlb;
|
|
|
|
if (msg->iova < v->range.first || !msg->size ||
|
|
msg->iova > U64_MAX - msg->size + 1 ||
|
|
msg->iova + msg->size - 1 > v->range.last)
|
|
return -EINVAL;
|
|
|
|
if (vhost_iotlb_itree_first(iotlb, msg->iova,
|
|
msg->iova + msg->size - 1))
|
|
return -EEXIST;
|
|
|
|
if (vdpa->use_va)
|
|
return vhost_vdpa_va_map(v, msg->iova, msg->size,
|
|
msg->uaddr, msg->perm);
|
|
|
|
return vhost_vdpa_pa_map(v, msg->iova, msg->size, msg->uaddr,
|
|
msg->perm);
|
|
}
|
|
|
|
static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
|
|
struct vhost_iotlb_msg *msg)
|
|
{
|
|
struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev);
|
|
struct vdpa_device *vdpa = v->vdpa;
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
int r = 0;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
|
|
r = vhost_dev_check_owner(dev);
|
|
if (r)
|
|
goto unlock;
|
|
|
|
switch (msg->type) {
|
|
case VHOST_IOTLB_UPDATE:
|
|
r = vhost_vdpa_process_iotlb_update(v, msg);
|
|
break;
|
|
case VHOST_IOTLB_INVALIDATE:
|
|
vhost_vdpa_unmap(v, msg->iova, msg->size);
|
|
break;
|
|
case VHOST_IOTLB_BATCH_BEGIN:
|
|
v->in_batch = true;
|
|
break;
|
|
case VHOST_IOTLB_BATCH_END:
|
|
if (v->in_batch && ops->set_map)
|
|
ops->set_map(vdpa, dev->iotlb);
|
|
v->in_batch = false;
|
|
break;
|
|
default:
|
|
r = -EINVAL;
|
|
break;
|
|
}
|
|
unlock:
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
return r;
|
|
}
|
|
|
|
static ssize_t vhost_vdpa_chr_write_iter(struct kiocb *iocb,
|
|
struct iov_iter *from)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct vhost_vdpa *v = file->private_data;
|
|
struct vhost_dev *dev = &v->vdev;
|
|
|
|
return vhost_chr_write_iter(dev, from);
|
|
}
|
|
|
|
static int vhost_vdpa_alloc_domain(struct vhost_vdpa *v)
|
|
{
|
|
struct vdpa_device *vdpa = v->vdpa;
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
struct device *dma_dev = vdpa_get_dma_dev(vdpa);
|
|
struct bus_type *bus;
|
|
int ret;
|
|
|
|
/* Device want to do DMA by itself */
|
|
if (ops->set_map || ops->dma_map)
|
|
return 0;
|
|
|
|
bus = dma_dev->bus;
|
|
if (!bus)
|
|
return -EFAULT;
|
|
|
|
if (!iommu_capable(bus, IOMMU_CAP_CACHE_COHERENCY))
|
|
return -ENOTSUPP;
|
|
|
|
v->domain = iommu_domain_alloc(bus);
|
|
if (!v->domain)
|
|
return -EIO;
|
|
|
|
ret = iommu_attach_device(v->domain, dma_dev);
|
|
if (ret)
|
|
goto err_attach;
|
|
|
|
return 0;
|
|
|
|
err_attach:
|
|
iommu_domain_free(v->domain);
|
|
return ret;
|
|
}
|
|
|
|
static void vhost_vdpa_free_domain(struct vhost_vdpa *v)
|
|
{
|
|
struct vdpa_device *vdpa = v->vdpa;
|
|
struct device *dma_dev = vdpa_get_dma_dev(vdpa);
|
|
|
|
if (v->domain) {
|
|
iommu_detach_device(v->domain, dma_dev);
|
|
iommu_domain_free(v->domain);
|
|
}
|
|
|
|
v->domain = NULL;
|
|
}
|
|
|
|
static void vhost_vdpa_set_iova_range(struct vhost_vdpa *v)
|
|
{
|
|
struct vdpa_iova_range *range = &v->range;
|
|
struct vdpa_device *vdpa = v->vdpa;
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
|
|
if (ops->get_iova_range) {
|
|
*range = ops->get_iova_range(vdpa);
|
|
} else if (v->domain && v->domain->geometry.force_aperture) {
|
|
range->first = v->domain->geometry.aperture_start;
|
|
range->last = v->domain->geometry.aperture_end;
|
|
} else {
|
|
range->first = 0;
|
|
range->last = ULLONG_MAX;
|
|
}
|
|
}
|
|
|
|
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 = container_of(inode->i_cdev, struct vhost_vdpa, cdev);
|
|
|
|
opened = atomic_cmpxchg(&v->opened, 0, 1);
|
|
if (opened)
|
|
return -EBUSY;
|
|
|
|
nvqs = v->nvqs;
|
|
r = vhost_vdpa_reset(v);
|
|
if (r)
|
|
goto err;
|
|
|
|
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, false,
|
|
vhost_vdpa_process_iotlb_msg);
|
|
|
|
dev->iotlb = vhost_iotlb_alloc(0, 0);
|
|
if (!dev->iotlb) {
|
|
r = -ENOMEM;
|
|
goto err_init_iotlb;
|
|
}
|
|
|
|
r = vhost_vdpa_alloc_domain(v);
|
|
if (r)
|
|
goto err_init_iotlb;
|
|
|
|
vhost_vdpa_set_iova_range(v);
|
|
|
|
filep->private_data = v;
|
|
|
|
return 0;
|
|
|
|
err_init_iotlb:
|
|
vhost_dev_cleanup(&v->vdev);
|
|
kfree(vqs);
|
|
err:
|
|
atomic_dec(&v->opened);
|
|
return r;
|
|
}
|
|
|
|
static void vhost_vdpa_clean_irq(struct vhost_vdpa *v)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < v->nvqs; i++)
|
|
vhost_vdpa_unsetup_vq_irq(v, i);
|
|
}
|
|
|
|
static int vhost_vdpa_release(struct inode *inode, struct file *filep)
|
|
{
|
|
struct vhost_vdpa *v = filep->private_data;
|
|
struct vhost_dev *d = &v->vdev;
|
|
|
|
mutex_lock(&d->mutex);
|
|
filep->private_data = NULL;
|
|
vhost_vdpa_clean_irq(v);
|
|
vhost_vdpa_reset(v);
|
|
vhost_dev_stop(&v->vdev);
|
|
vhost_vdpa_iotlb_free(v);
|
|
vhost_vdpa_free_domain(v);
|
|
vhost_vdpa_config_put(v);
|
|
vhost_dev_cleanup(&v->vdev);
|
|
kfree(v->vdev.vqs);
|
|
mutex_unlock(&d->mutex);
|
|
|
|
atomic_dec(&v->opened);
|
|
complete(&v->completion);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_MMU
|
|
static vm_fault_t vhost_vdpa_fault(struct vm_fault *vmf)
|
|
{
|
|
struct vhost_vdpa *v = vmf->vma->vm_file->private_data;
|
|
struct vdpa_device *vdpa = v->vdpa;
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
struct vdpa_notification_area notify;
|
|
struct vm_area_struct *vma = vmf->vma;
|
|
u16 index = vma->vm_pgoff;
|
|
|
|
notify = ops->get_vq_notification(vdpa, index);
|
|
|
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
|
if (remap_pfn_range(vma, vmf->address & PAGE_MASK,
|
|
PFN_DOWN(notify.addr), PAGE_SIZE,
|
|
vma->vm_page_prot))
|
|
return VM_FAULT_SIGBUS;
|
|
|
|
return VM_FAULT_NOPAGE;
|
|
}
|
|
|
|
static const struct vm_operations_struct vhost_vdpa_vm_ops = {
|
|
.fault = vhost_vdpa_fault,
|
|
};
|
|
|
|
static int vhost_vdpa_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
struct vhost_vdpa *v = vma->vm_file->private_data;
|
|
struct vdpa_device *vdpa = v->vdpa;
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
struct vdpa_notification_area notify;
|
|
unsigned long index = vma->vm_pgoff;
|
|
|
|
if (vma->vm_end - vma->vm_start != PAGE_SIZE)
|
|
return -EINVAL;
|
|
if ((vma->vm_flags & VM_SHARED) == 0)
|
|
return -EINVAL;
|
|
if (vma->vm_flags & VM_READ)
|
|
return -EINVAL;
|
|
if (index > 65535)
|
|
return -EINVAL;
|
|
if (!ops->get_vq_notification)
|
|
return -ENOTSUPP;
|
|
|
|
/* To be safe and easily modelled by userspace, We only
|
|
* support the doorbell which sits on the page boundary and
|
|
* does not share the page with other registers.
|
|
*/
|
|
notify = ops->get_vq_notification(vdpa, index);
|
|
if (notify.addr & (PAGE_SIZE - 1))
|
|
return -EINVAL;
|
|
if (vma->vm_end - vma->vm_start != notify.size)
|
|
return -ENOTSUPP;
|
|
|
|
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
|
|
vma->vm_ops = &vhost_vdpa_vm_ops;
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_MMU */
|
|
|
|
static const struct file_operations vhost_vdpa_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = vhost_vdpa_open,
|
|
.release = vhost_vdpa_release,
|
|
.write_iter = vhost_vdpa_chr_write_iter,
|
|
.unlocked_ioctl = vhost_vdpa_unlocked_ioctl,
|
|
#ifdef CONFIG_MMU
|
|
.mmap = vhost_vdpa_mmap,
|
|
#endif /* CONFIG_MMU */
|
|
.compat_ioctl = compat_ptr_ioctl,
|
|
};
|
|
|
|
static void vhost_vdpa_release_dev(struct device *device)
|
|
{
|
|
struct vhost_vdpa *v =
|
|
container_of(device, struct vhost_vdpa, dev);
|
|
|
|
ida_simple_remove(&vhost_vdpa_ida, v->minor);
|
|
kfree(v->vqs);
|
|
kfree(v);
|
|
}
|
|
|
|
static int vhost_vdpa_probe(struct vdpa_device *vdpa)
|
|
{
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
struct vhost_vdpa *v;
|
|
int minor;
|
|
int r;
|
|
|
|
v = kzalloc(sizeof(*v), GFP_KERNEL | __GFP_RETRY_MAYFAIL);
|
|
if (!v)
|
|
return -ENOMEM;
|
|
|
|
minor = ida_simple_get(&vhost_vdpa_ida, 0,
|
|
VHOST_VDPA_DEV_MAX, GFP_KERNEL);
|
|
if (minor < 0) {
|
|
kfree(v);
|
|
return minor;
|
|
}
|
|
|
|
atomic_set(&v->opened, 0);
|
|
v->minor = minor;
|
|
v->vdpa = vdpa;
|
|
v->nvqs = vdpa->nvqs;
|
|
v->virtio_id = ops->get_device_id(vdpa);
|
|
|
|
device_initialize(&v->dev);
|
|
v->dev.release = vhost_vdpa_release_dev;
|
|
v->dev.parent = &vdpa->dev;
|
|
v->dev.devt = MKDEV(MAJOR(vhost_vdpa_major), minor);
|
|
v->vqs = kmalloc_array(v->nvqs, sizeof(struct vhost_virtqueue),
|
|
GFP_KERNEL);
|
|
if (!v->vqs) {
|
|
r = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
r = dev_set_name(&v->dev, "vhost-vdpa-%u", minor);
|
|
if (r)
|
|
goto err;
|
|
|
|
cdev_init(&v->cdev, &vhost_vdpa_fops);
|
|
v->cdev.owner = THIS_MODULE;
|
|
|
|
r = cdev_device_add(&v->cdev, &v->dev);
|
|
if (r)
|
|
goto err;
|
|
|
|
init_completion(&v->completion);
|
|
vdpa_set_drvdata(vdpa, v);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
put_device(&v->dev);
|
|
return r;
|
|
}
|
|
|
|
static void vhost_vdpa_remove(struct vdpa_device *vdpa)
|
|
{
|
|
struct vhost_vdpa *v = vdpa_get_drvdata(vdpa);
|
|
int opened;
|
|
|
|
cdev_device_del(&v->cdev, &v->dev);
|
|
|
|
do {
|
|
opened = atomic_cmpxchg(&v->opened, 0, 1);
|
|
if (!opened)
|
|
break;
|
|
wait_for_completion(&v->completion);
|
|
} while (1);
|
|
|
|
put_device(&v->dev);
|
|
}
|
|
|
|
static struct vdpa_driver vhost_vdpa_driver = {
|
|
.driver = {
|
|
.name = "vhost_vdpa",
|
|
},
|
|
.probe = vhost_vdpa_probe,
|
|
.remove = vhost_vdpa_remove,
|
|
};
|
|
|
|
static int __init vhost_vdpa_init(void)
|
|
{
|
|
int r;
|
|
|
|
r = alloc_chrdev_region(&vhost_vdpa_major, 0, VHOST_VDPA_DEV_MAX,
|
|
"vhost-vdpa");
|
|
if (r)
|
|
goto err_alloc_chrdev;
|
|
|
|
r = vdpa_register_driver(&vhost_vdpa_driver);
|
|
if (r)
|
|
goto err_vdpa_register_driver;
|
|
|
|
return 0;
|
|
|
|
err_vdpa_register_driver:
|
|
unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX);
|
|
err_alloc_chrdev:
|
|
return r;
|
|
}
|
|
module_init(vhost_vdpa_init);
|
|
|
|
static void __exit vhost_vdpa_exit(void)
|
|
{
|
|
vdpa_unregister_driver(&vhost_vdpa_driver);
|
|
unregister_chrdev_region(vhost_vdpa_major, VHOST_VDPA_DEV_MAX);
|
|
}
|
|
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");
|