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vhost: factor out IOTLB

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This patch factors out IOTLB into a dedicated module in order to be
reused by other modules like vringh. User may choose to enable the
automatic retiring by specifying VHOST_IOTLB_FLAG_RETIRE flag to fit
for the case of vhost device IOTLB implementation.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200326140125.19794-4-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2020-03-26 22:01:19 +08:00 committed by Michael S. Tsirkin
parent 792a4f2ed2
commit 0bbe30668d
8 changed files with 315 additions and 181 deletions
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1
MAINTAINERS
View File

@ -17766,6 +17766,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git
S: Maintained
F: drivers/vhost/
F: include/uapi/linux/vhost.h
F: include/linux/vhost_iotlb.h
VIRTIO INPUT DRIVER
M: Gerd Hoffmann <kraxel@redhat.com>

6
drivers/vhost/Kconfig
View File

@ -1,4 +1,9 @@
# SPDX-License-Identifier: GPL-2.0-only
config VHOST_IOTLB
tristate
help
Generic IOTLB implementation for vhost and vringh.
config VHOST_RING
tristate
help
@ -67,4 +72,5 @@ config VHOST_CROSS_ENDIAN_LEGACY
adds some overhead, it is disabled by default.
If unsure, say "N".
endif

3
drivers/vhost/Makefile
View File

@ -11,3 +11,6 @@ vhost_vsock-y := vsock.o
obj-$(CONFIG_VHOST_RING) += vringh.o
obj-$(CONFIG_VHOST) += vhost.o
obj-$(CONFIG_VHOST_IOTLB) += vhost_iotlb.o
vhost_iotlb-y := iotlb.o

177
drivers/vhost/iotlb.c Normal file
View File

@ -0,0 +1,177 @@
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (C) 2020 Red Hat, Inc.
* Author: Jason Wang <jasowang@redhat.com>
*
* IOTLB implementation for vhost.
*/
#include <linux/slab.h>
#include <linux/vhost_iotlb.h>
#include <linux/module.h>
#define MOD_VERSION "0.1"
#define MOD_DESC "VHOST IOTLB"
#define MOD_AUTHOR "Jason Wang <jasowang@redhat.com>"
#define MOD_LICENSE "GPL v2"
#define START(map) ((map)->start)
#define LAST(map) ((map)->last)
INTERVAL_TREE_DEFINE(struct vhost_iotlb_map,
rb, __u64, __subtree_last,
START, LAST, static inline, vhost_iotlb_itree);
/**
* vhost_iotlb_map_free - remove a map node and free it
* @iotlb: the IOTLB
* @map: the map that want to be remove and freed
*/
void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
struct vhost_iotlb_map *map)
{
vhost_iotlb_itree_remove(map, &iotlb->root);
list_del(&map->link);
kfree(map);
iotlb->nmaps--;
}
EXPORT_SYMBOL_GPL(vhost_iotlb_map_free);
/**
* vhost_iotlb_add_range - add a new range to vhost IOTLB
* @iotlb: the IOTLB
* @start: start of the IOVA range
* @last: last of IOVA range
* @addr: the address that is mapped to @start
* @perm: access permission of this range
*
* Returns an error last is smaller than start or memory allocation
* fails
*/
int vhost_iotlb_add_range(struct vhost_iotlb *iotlb,
u64 start, u64 last,
u64 addr, unsigned int perm)
{
struct vhost_iotlb_map *map;
if (last < start)
return -EFAULT;
if (iotlb->limit &&
iotlb->nmaps == iotlb->limit &&
iotlb->flags & VHOST_IOTLB_FLAG_RETIRE) {
map = list_first_entry(&iotlb->list, typeof(*map), link);
vhost_iotlb_map_free(iotlb, map);
}
map = kmalloc(sizeof(*map), GFP_ATOMIC);
if (!map)
return -ENOMEM;
map->start = start;
map->size = last - start + 1;
map->last = last;
map->addr = addr;
map->perm = perm;
iotlb->nmaps++;
vhost_iotlb_itree_insert(map, &iotlb->root);
INIT_LIST_HEAD(&map->link);
list_add_tail(&map->link, &iotlb->list);
return 0;
}
EXPORT_SYMBOL_GPL(vhost_iotlb_add_range);
/**
* vring_iotlb_del_range - delete overlapped ranges from vhost IOTLB
* @iotlb: the IOTLB
* @start: start of the IOVA range
* @last: last of IOVA range
*/
void vhost_iotlb_del_range(struct vhost_iotlb *iotlb, u64 start, u64 last)
{
struct vhost_iotlb_map *map;
while ((map = vhost_iotlb_itree_iter_first(&iotlb->root,
start, last)))
vhost_iotlb_map_free(iotlb, map);
}
EXPORT_SYMBOL_GPL(vhost_iotlb_del_range);
/**
* vhost_iotlb_alloc - add a new vhost IOTLB
* @limit: maximum number of IOTLB entries
* @flags: VHOST_IOTLB_FLAG_XXX
*
* Returns an error is memory allocation fails
*/
struct vhost_iotlb *vhost_iotlb_alloc(unsigned int limit, unsigned int flags)
{
struct vhost_iotlb *iotlb = kzalloc(sizeof(*iotlb), GFP_KERNEL);
if (!iotlb)
return NULL;
iotlb->root = RB_ROOT_CACHED;
iotlb->limit = limit;
iotlb->nmaps = 0;
iotlb->flags = flags;
INIT_LIST_HEAD(&iotlb->list);
return iotlb;
}
EXPORT_SYMBOL_GPL(vhost_iotlb_alloc);
/**
* vhost_iotlb_reset - reset vhost IOTLB (free all IOTLB entries)
* @iotlb: the IOTLB to be reset
*/
void vhost_iotlb_reset(struct vhost_iotlb *iotlb)
{
vhost_iotlb_del_range(iotlb, 0ULL, 0ULL - 1);
}
EXPORT_SYMBOL_GPL(vhost_iotlb_reset);
/**
* vhost_iotlb_free - reset and free vhost IOTLB
* @iotlb: the IOTLB to be freed
*/
void vhost_iotlb_free(struct vhost_iotlb *iotlb)
{
if (iotlb) {
vhost_iotlb_reset(iotlb);
kfree(iotlb);
}
}
EXPORT_SYMBOL_GPL(vhost_iotlb_free);
/**
* vhost_iotlb_itree_first - return the first overlapped range
* @iotlb: the IOTLB
* @start: start of IOVA range
* @end: end of IOVA range
*/
struct vhost_iotlb_map *
vhost_iotlb_itree_first(struct vhost_iotlb *iotlb, u64 start, u64 last)
{
return vhost_iotlb_itree_iter_first(&iotlb->root, start, last);
}
EXPORT_SYMBOL_GPL(vhost_iotlb_itree_first);
/**
* vhost_iotlb_itree_first - return the next overlapped range
* @iotlb: the IOTLB
* @start: start of IOVA range
* @end: end of IOVA range
*/
struct vhost_iotlb_map *
vhost_iotlb_itree_next(struct vhost_iotlb_map *map, u64 start, u64 last)
{
return vhost_iotlb_itree_iter_next(map, start, last);
}
EXPORT_SYMBOL_GPL(vhost_iotlb_itree_next);
MODULE_VERSION(MOD_VERSION);
MODULE_DESCRIPTION(MOD_DESC);
MODULE_AUTHOR(MOD_AUTHOR);
MODULE_LICENSE(MOD_LICENSE);

2
drivers/vhost/net.c
View File

@ -1587,7 +1587,7 @@ static long vhost_net_reset_owner(struct vhost_net *n)
struct socket *tx_sock = NULL;
struct socket *rx_sock = NULL;
long err;
struct vhost_umem *umem;
struct vhost_iotlb *umem;
mutex_lock(&n->dev.mutex);
err = vhost_dev_check_owner(&n->dev);

221
drivers/vhost/vhost.c
View File

@ -50,10 +50,6 @@ enum {
#define vhost_used_event(vq) ((__virtio16 __user *)&vq->avail->ring[vq->num])
#define vhost_avail_event(vq) ((__virtio16 __user *)&vq->used->ring[vq->num])
INTERVAL_TREE_DEFINE(struct vhost_umem_node,
rb, __u64, __subtree_last,
START, LAST, static inline, vhost_umem_interval_tree);
#ifdef CONFIG_VHOST_CROSS_ENDIAN_LEGACY
static void vhost_disable_cross_endian(struct vhost_virtqueue *vq)
{
@ -584,21 +580,25 @@ err_mm:
}
EXPORT_SYMBOL_GPL(vhost_dev_set_owner);
struct vhost_umem *vhost_dev_reset_owner_prepare(void)
static struct vhost_iotlb *iotlb_alloc(void)
{
return kvzalloc(sizeof(struct vhost_umem), GFP_KERNEL);
return vhost_iotlb_alloc(max_iotlb_entries,
VHOST_IOTLB_FLAG_RETIRE);
}
struct vhost_iotlb *vhost_dev_reset_owner_prepare(void)
{
return iotlb_alloc();
}
EXPORT_SYMBOL_GPL(vhost_dev_reset_owner_prepare);
/* Caller should have device mutex */
void vhost_dev_reset_owner(struct vhost_dev *dev, struct vhost_umem *umem)
void vhost_dev_reset_owner(struct vhost_dev *dev, struct vhost_iotlb *umem)
{
int i;
vhost_dev_cleanup(dev);
/* Restore memory to default empty mapping. */
INIT_LIST_HEAD(&umem->umem_list);
dev->umem = umem;
/* We don't need VQ locks below since vhost_dev_cleanup makes sure
* VQs aren't running.
@ -621,28 +621,6 @@ void vhost_dev_stop(struct vhost_dev *dev)
}
EXPORT_SYMBOL_GPL(vhost_dev_stop);
static void vhost_umem_free(struct vhost_umem *umem,
struct vhost_umem_node *node)
{
vhost_umem_interval_tree_remove(node, &umem->umem_tree);
list_del(&node->link);
kfree(node);
umem->numem--;
}
static void vhost_umem_clean(struct vhost_umem *umem)
{
struct vhost_umem_node *node, *tmp;
if (!umem)
return;
list_for_each_entry_safe(node, tmp, &umem->umem_list, link)
vhost_umem_free(umem, node);
kvfree(umem);
}
static void vhost_clear_msg(struct vhost_dev *dev)
{
struct vhost_msg_node *node, *n;
@ -680,9 +658,9 @@ void vhost_dev_cleanup(struct vhost_dev *dev)
eventfd_ctx_put(dev->log_ctx);
dev->log_ctx = NULL;
/* No one will access memory at this point */
vhost_umem_clean(dev->umem);
vhost_iotlb_free(dev->umem);
dev->umem = NULL;
vhost_umem_clean(dev->iotlb);
vhost_iotlb_free(dev->iotlb);
dev->iotlb = NULL;
vhost_clear_msg(dev);
wake_up_interruptible_poll(&dev->wait, EPOLLIN | EPOLLRDNORM);
@ -718,27 +696,26 @@ static bool vhost_overflow(u64 uaddr, u64 size)
}
/* Caller should have vq mutex and device mutex. */
static bool vq_memory_access_ok(void __user *log_base, struct vhost_umem *umem,
static bool vq_memory_access_ok(void __user *log_base, struct vhost_iotlb *umem,
int log_all)
{
struct vhost_umem_node *node;
struct vhost_iotlb_map *map;
if (!umem)
return false;
list_for_each_entry(node, &umem->umem_list, link) {
unsigned long a = node->userspace_addr;
list_for_each_entry(map, &umem->list, link) {
unsigned long a = map->addr;
if (vhost_overflow(node->userspace_addr, node->size))
if (vhost_overflow(map->addr, map->size))
return false;
if (!access_ok((void __user *)a,
node->size))
if (!access_ok((void __user *)a, map->size))
return false;
else if (log_all && !log_access_ok(log_base,
node->start,
node->size))
map->start,
map->size))
return false;
}
return true;
@ -748,17 +725,17 @@ static inline void __user *vhost_vq_meta_fetch(struct vhost_virtqueue *vq,
u64 addr, unsigned int size,
int type)
{
const struct vhost_umem_node *node = vq->meta_iotlb[type];
const struct vhost_iotlb_map *map = vq->meta_iotlb[type];
if (!node)
if (!map)
return NULL;
return (void *)(uintptr_t)(node->userspace_addr + addr - node->start);
return (void *)(uintptr_t)(map->addr + addr - map->start);
}
/* Can we switch to this memory table? */
/* Caller should have device mutex but not vq mutex */
static bool memory_access_ok(struct vhost_dev *d, struct vhost_umem *umem,
static bool memory_access_ok(struct vhost_dev *d, struct vhost_iotlb *umem,
int log_all)
{
int i;
@ -1023,47 +1000,6 @@ static inline int vhost_get_desc(struct vhost_virtqueue *vq,
return vhost_copy_from_user(vq, desc, vq->desc + idx, sizeof(*desc));
}
static int vhost_new_umem_range(struct vhost_umem *umem,
u64 start, u64 size, u64 end,
u64 userspace_addr, int perm)
{
struct vhost_umem_node *tmp, *node;
if (!size)
return -EFAULT;
node = kmalloc(sizeof(*node), GFP_ATOMIC);
if (!node)
return -ENOMEM;
if (umem->numem == max_iotlb_entries) {
tmp = list_first_entry(&umem->umem_list, typeof(*tmp), link);
vhost_umem_free(umem, tmp);
}
node->start = start;
node->size = size;
node->last = end;
node->userspace_addr = userspace_addr;
node->perm = perm;
INIT_LIST_HEAD(&node->link);
list_add_tail(&node->link, &umem->umem_list);
vhost_umem_interval_tree_insert(node, &umem->umem_tree);
umem->numem++;
return 0;
}
static void vhost_del_umem_range(struct vhost_umem *umem,
u64 start, u64 end)
{
struct vhost_umem_node *node;
while ((node = vhost_umem_interval_tree_iter_first(&umem->umem_tree,
start, end)))
vhost_umem_free(umem, node);
}
static void vhost_iotlb_notify_vq(struct vhost_dev *d,
struct vhost_iotlb_msg *msg)
{
@ -1120,9 +1056,9 @@ static int vhost_process_iotlb_msg(struct vhost_dev *dev,
break;
}
vhost_vq_meta_reset(dev);
if (vhost_new_umem_range(dev->iotlb, msg->iova, msg->size,
msg->iova + msg->size - 1,
msg->uaddr, msg->perm)) {
if (vhost_iotlb_add_range(dev->iotlb, msg->iova,
msg->iova + msg->size - 1,
msg->uaddr, msg->perm)) {
ret = -ENOMEM;
break;
}
@ -1134,8 +1070,8 @@ static int vhost_process_iotlb_msg(struct vhost_dev *dev,
break;
}
vhost_vq_meta_reset(dev);
vhost_del_umem_range(dev->iotlb, msg->iova,
msg->iova + msg->size - 1);
vhost_iotlb_del_range(dev->iotlb, msg->iova,
msg->iova + msg->size - 1);
break;
default:
ret = -EINVAL;
@ -1319,44 +1255,42 @@ static bool vq_access_ok(struct vhost_virtqueue *vq, unsigned int num,
}
static void vhost_vq_meta_update(struct vhost_virtqueue *vq,
const struct vhost_umem_node *node,
const struct vhost_iotlb_map *map,
int type)
{
int access = (type == VHOST_ADDR_USED) ?
VHOST_ACCESS_WO : VHOST_ACCESS_RO;
if (likely(node->perm & access))
vq->meta_iotlb[type] = node;
if (likely(map->perm & access))
vq->meta_iotlb[type] = map;
}
static bool iotlb_access_ok(struct vhost_virtqueue *vq,
int access, u64 addr, u64 len, int type)
{
const struct vhost_umem_node *node;
struct vhost_umem *umem = vq->iotlb;
const struct vhost_iotlb_map *map;
struct vhost_iotlb *umem = vq->iotlb;
u64 s = 0, size, orig_addr = addr, last = addr + len - 1;
if (vhost_vq_meta_fetch(vq, addr, len, type))
return true;
while (len > s) {
node = vhost_umem_interval_tree_iter_first(&umem->umem_tree,
addr,
last);
if (node == NULL || node->start > addr) {
map = vhost_iotlb_itree_first(umem, addr, last);
if (map == NULL || map->start > addr) {
vhost_iotlb_miss(vq, addr, access);
return false;
} else if (!(node->perm & access)) {
} else if (!(map->perm & access)) {
/* Report the possible access violation by
* request another translation from userspace.
*/
return false;
}
size = node->size - addr + node->start;
size = map->size - addr + map->start;
if (orig_addr == addr && size >= len)
vhost_vq_meta_update(vq, node, type);
vhost_vq_meta_update(vq, map, type);
s += size;
addr += size;
@ -1372,12 +1306,12 @@ int vq_meta_prefetch(struct vhost_virtqueue *vq)
if (!vq->iotlb)
return 1;
return iotlb_access_ok(vq, VHOST_ACCESS_RO, (u64)(uintptr_t)vq->desc,
return iotlb_access_ok(vq, VHOST_MAP_RO, (u64)(uintptr_t)vq->desc,
vhost_get_desc_size(vq, num), VHOST_ADDR_DESC) &&
iotlb_access_ok(vq, VHOST_ACCESS_RO, (u64)(uintptr_t)vq->avail,
iotlb_access_ok(vq, VHOST_MAP_RO, (u64)(uintptr_t)vq->avail,
vhost_get_avail_size(vq, num),
VHOST_ADDR_AVAIL) &&
iotlb_access_ok(vq, VHOST_ACCESS_WO, (u64)(uintptr_t)vq->used,
iotlb_access_ok(vq, VHOST_MAP_WO, (u64)(uintptr_t)vq->used,
vhost_get_used_size(vq, num), VHOST_ADDR_USED);
}
EXPORT_SYMBOL_GPL(vq_meta_prefetch);
@ -1416,25 +1350,11 @@ bool vhost_vq_access_ok(struct vhost_virtqueue *vq)
}
EXPORT_SYMBOL_GPL(vhost_vq_access_ok);
static struct vhost_umem *vhost_umem_alloc(void)
{
struct vhost_umem *umem = kvzalloc(sizeof(*umem), GFP_KERNEL);
if (!umem)
return NULL;
umem->umem_tree = RB_ROOT_CACHED;
umem->numem = 0;
INIT_LIST_HEAD(&umem->umem_list);
return umem;
}
static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
{
struct vhost_memory mem, *newmem;
struct vhost_memory_region *region;
struct vhost_umem *newumem, *oldumem;
struct vhost_iotlb *newumem, *oldumem;
unsigned long size = offsetof(struct vhost_memory, regions);
int i;
@ -1456,7 +1376,7 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
return -EFAULT;
}
newumem = vhost_umem_alloc();
newumem = iotlb_alloc();
if (!newumem) {
kvfree(newmem);
return -ENOMEM;
@ -1465,13 +1385,12 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
for (region = newmem->regions;
region < newmem->regions + mem.nregions;
region++) {
if (vhost_new_umem_range(newumem,
region->guest_phys_addr,
region->memory_size,
region->guest_phys_addr +
region->memory_size - 1,
region->userspace_addr,
VHOST_ACCESS_RW))
if (vhost_iotlb_add_range(newumem,
region->guest_phys_addr,
region->guest_phys_addr +
region->memory_size - 1,
region->userspace_addr,
VHOST_MAP_RW))
goto err;
}
@ -1489,11 +1408,11 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
}
kvfree(newmem);
vhost_umem_clean(oldumem);
vhost_iotlb_free(oldumem);
return 0;
err:
vhost_umem_clean(newumem);
vhost_iotlb_free(newumem);
kvfree(newmem);
return -EFAULT;
}
@ -1734,10 +1653,10 @@ EXPORT_SYMBOL_GPL(vhost_vring_ioctl);
int vhost_init_device_iotlb(struct vhost_dev *d, bool enabled)
{
struct vhost_umem *niotlb, *oiotlb;
struct vhost_iotlb *niotlb, *oiotlb;
int i;
niotlb = vhost_umem_alloc();
niotlb = iotlb_alloc();
if (!niotlb)
return -ENOMEM;
@ -1753,7 +1672,7 @@ int vhost_init_device_iotlb(struct vhost_dev *d, bool enabled)
mutex_unlock(&vq->mutex);
}
vhost_umem_clean(oiotlb);
vhost_iotlb_free(oiotlb);
return 0;
}
@ -1883,8 +1802,8 @@ static int log_write(void __user *log_base,
static int log_write_hva(struct vhost_virtqueue *vq, u64 hva, u64 len)
{
struct vhost_umem *umem = vq->umem;
struct vhost_umem_node *u;
struct vhost_iotlb *umem = vq->umem;
struct vhost_iotlb_map *u;
u64 start, end, l, min;
int r;
bool hit = false;
@ -1894,16 +1813,15 @@ static int log_write_hva(struct vhost_virtqueue *vq, u64 hva, u64 len)
/* More than one GPAs can be mapped into a single HVA. So
* iterate all possible umems here to be safe.
*/
list_for_each_entry(u, &umem->umem_list, link) {
if (u->userspace_addr > hva - 1 + len ||
u->userspace_addr - 1 + u->size < hva)
list_for_each_entry(u, &umem->list, link) {
if (u->addr > hva - 1 + len ||
u->addr - 1 + u->size < hva)
continue;
start = max(u->userspace_addr, hva);
end = min(u->userspace_addr - 1 + u->size,
hva - 1 + len);
start = max(u->addr, hva);
end = min(u->addr - 1 + u->size, hva - 1 + len);
l = end - start + 1;
r = log_write(vq->log_base,
u->start + start - u->userspace_addr,
u->start + start - u->addr,
l);
if (r < 0)
return r;
@ -2054,9 +1972,9 @@ EXPORT_SYMBOL_GPL(vhost_vq_init_access);
static int translate_desc(struct vhost_virtqueue *vq, u64 addr, u32 len,
struct iovec iov[], int iov_size, int access)
{
const struct vhost_umem_node *node;
const struct vhost_iotlb_map *map;
struct vhost_dev *dev = vq->dev;
struct vhost_umem *umem = dev->iotlb ? dev->iotlb : dev->umem;
struct vhost_iotlb *umem = dev->iotlb ? dev->iotlb : dev->umem;
struct iovec *_iov;
u64 s = 0;
int ret = 0;
@ -2068,25 +1986,24 @@ static int translate_desc(struct vhost_virtqueue *vq, u64 addr, u32 len,
break;
}
node = vhost_umem_interval_tree_iter_first(&umem->umem_tree,
addr, addr + len - 1);
if (node == NULL || node->start > addr) {
map = vhost_iotlb_itree_first(umem, addr, addr + len - 1);
if (map == NULL || map->start > addr) {
if (umem != dev->iotlb) {
ret = -EFAULT;
break;
}
ret = -EAGAIN;
break;
} else if (!(node->perm & access)) {
} else if (!(map->perm & access)) {
ret = -EPERM;
break;
}
_iov = iov + ret;
size = node->size - addr + node->start;
size = map->size - addr + map->start;
_iov->iov_len = min((u64)len - s, size);
_iov->iov_base = (void __user *)(unsigned long)
(node->userspace_addr + addr - node->start);
(map->addr + addr - map->start);
s += size;
addr += size;
++ret;

39
drivers/vhost/vhost.h
View File

@ -12,6 +12,7 @@
#include <linux/virtio_config.h>
#include <linux/virtio_ring.h>
#include <linux/atomic.h>
#include <linux/vhost_iotlb.h>
struct vhost_work;
typedef void (*vhost_work_fn_t)(struct vhost_work *work);
@ -52,27 +53,6 @@ struct vhost_log {
u64 len;
};
#define START(node) ((node)->start)
#define LAST(node) ((node)->last)
struct vhost_umem_node {
struct rb_node rb;
struct list_head link;
__u64 start;
__u64 last;
__u64 size;
__u64 userspace_addr;
__u32 perm;
__u32 flags_padding;
__u64 __subtree_last;
};
struct vhost_umem {
struct rb_root_cached umem_tree;
struct list_head umem_list;
int numem;
};
enum vhost_uaddr_type {
VHOST_ADDR_DESC = 0,
VHOST_ADDR_AVAIL = 1,
@ -90,7 +70,7 @@ struct vhost_virtqueue {
struct vring_desc __user *desc;
struct vring_avail __user *avail;
struct vring_used __user *used;
const struct vhost_umem_node *meta_iotlb[VHOST_NUM_ADDRS];
const struct vhost_iotlb_map *meta_iotlb[VHOST_NUM_ADDRS];
struct file *kick;
struct eventfd_ctx *call_ctx;
struct eventfd_ctx *error_ctx;
@ -128,8 +108,8 @@ struct vhost_virtqueue {
struct iovec *indirect;
struct vring_used_elem *heads;
/* Protected by virtqueue mutex. */
struct vhost_umem *umem;
struct vhost_umem *iotlb;
struct vhost_iotlb *umem;
struct vhost_iotlb *iotlb;
void *private_data;
u64 acked_features;
u64 acked_backend_features;
@ -164,8 +144,8 @@ struct vhost_dev {
struct eventfd_ctx *log_ctx;
struct llist_head work_list;
struct task_struct *worker;
struct vhost_umem *umem;
struct vhost_umem *iotlb;
struct vhost_iotlb *umem;
struct vhost_iotlb *iotlb;
spinlock_t iotlb_lock;
struct list_head read_list;
struct list_head pending_list;
@ -186,8 +166,8 @@ void vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue **vqs,
long vhost_dev_set_owner(struct vhost_dev *dev);
bool vhost_dev_has_owner(struct vhost_dev *dev);
long vhost_dev_check_owner(struct vhost_dev *);
struct vhost_umem *vhost_dev_reset_owner_prepare(void);
void vhost_dev_reset_owner(struct vhost_dev *, struct vhost_umem *);
struct vhost_iotlb *vhost_dev_reset_owner_prepare(void);
void vhost_dev_reset_owner(struct vhost_dev *dev, struct vhost_iotlb *iotlb);
void vhost_dev_cleanup(struct vhost_dev *);
void vhost_dev_stop(struct vhost_dev *);
long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, void __user *argp);
@ -233,6 +213,9 @@ ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
struct iov_iter *from);
int vhost_init_device_iotlb(struct vhost_dev *d, bool enabled);
void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
struct vhost_iotlb_map *map);
#define vq_err(vq, fmt, ...) do { \
pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \
if ((vq)->error_ctx) \

47
include/linux/vhost_iotlb.h Normal file
View File

@ -0,0 +1,47 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_VHOST_IOTLB_H
#define _LINUX_VHOST_IOTLB_H
#include <linux/interval_tree_generic.h>
struct vhost_iotlb_map {
struct rb_node rb;
struct list_head link;
u64 start;
u64 last;
u64 size;
u64 addr;
#define VHOST_MAP_RO 0x1
#define VHOST_MAP_WO 0x2
#define VHOST_MAP_RW 0x3
u32 perm;
u32 flags_padding;
u64 __subtree_last;
};
#define VHOST_IOTLB_FLAG_RETIRE 0x1
struct vhost_iotlb {
struct rb_root_cached root;
struct list_head list;
unsigned int limit;
unsigned int nmaps;
unsigned int flags;
};
int vhost_iotlb_add_range(struct vhost_iotlb *iotlb, u64 start, u64 last,
u64 addr, unsigned int perm);
void vhost_iotlb_del_range(struct vhost_iotlb *iotlb, u64 start, u64 last);
struct vhost_iotlb *vhost_iotlb_alloc(unsigned int limit, unsigned int flags);
void vhost_iotlb_free(struct vhost_iotlb *iotlb);
void vhost_iotlb_reset(struct vhost_iotlb *iotlb);
struct vhost_iotlb_map *
vhost_iotlb_itree_first(struct vhost_iotlb *iotlb, u64 start, u64 last);
struct vhost_iotlb_map *
vhost_iotlb_itree_next(struct vhost_iotlb_map *map, u64 start, u64 last);
void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
struct vhost_iotlb_map *map);
#endif