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path: root/drivers/vhost/vhost.c
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Diffstat (limited to 'drivers/vhost/vhost.c')
-rw-r--r--drivers/vhost/vhost.c55
1 files changed, 38 insertions, 17 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index ade0568c07a4..2ab291241635 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -41,8 +41,8 @@ static void vhost_poll_func(struct file *file, wait_queue_head_t *wqh,
poll_table *pt)
{
struct vhost_poll *poll;
- poll = container_of(pt, struct vhost_poll, table);
+ poll = container_of(pt, struct vhost_poll, table);
poll->wqh = wqh;
add_wait_queue(wqh, &poll->wait);
}
@@ -85,6 +85,7 @@ void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
void vhost_poll_start(struct vhost_poll *poll, struct file *file)
{
unsigned long mask;
+
mask = file->f_op->poll(file, &poll->table);
if (mask)
vhost_poll_wakeup(&poll->wait, 0, 0, (void *)mask);
@@ -101,6 +102,7 @@ static bool vhost_work_seq_done(struct vhost_dev *dev, struct vhost_work *work,
unsigned seq)
{
int left;
+
spin_lock_irq(&dev->work_lock);
left = seq - work->done_seq;
spin_unlock_irq(&dev->work_lock);
@@ -222,6 +224,7 @@ static int vhost_worker(void *data)
static long vhost_dev_alloc_iovecs(struct vhost_dev *dev)
{
int i;
+
for (i = 0; i < dev->nvqs; ++i) {
dev->vqs[i].indirect = kmalloc(sizeof *dev->vqs[i].indirect *
UIO_MAXIOV, GFP_KERNEL);
@@ -235,6 +238,7 @@ static long vhost_dev_alloc_iovecs(struct vhost_dev *dev)
goto err_nomem;
}
return 0;
+
err_nomem:
for (; i >= 0; --i) {
kfree(dev->vqs[i].indirect);
@@ -247,6 +251,7 @@ err_nomem:
static void vhost_dev_free_iovecs(struct vhost_dev *dev)
{
int i;
+
for (i = 0; i < dev->nvqs; ++i) {
kfree(dev->vqs[i].indirect);
dev->vqs[i].indirect = NULL;
@@ -296,26 +301,28 @@ long vhost_dev_check_owner(struct vhost_dev *dev)
}
struct vhost_attach_cgroups_struct {
- struct vhost_work work;
- struct task_struct *owner;
- int ret;
+ struct vhost_work work;
+ struct task_struct *owner;
+ int ret;
};
static void vhost_attach_cgroups_work(struct vhost_work *work)
{
- struct vhost_attach_cgroups_struct *s;
- s = container_of(work, struct vhost_attach_cgroups_struct, work);
- s->ret = cgroup_attach_task_all(s->owner, current);
+ struct vhost_attach_cgroups_struct *s;
+
+ s = container_of(work, struct vhost_attach_cgroups_struct, work);
+ s->ret = cgroup_attach_task_all(s->owner, current);
}
static int vhost_attach_cgroups(struct vhost_dev *dev)
{
- struct vhost_attach_cgroups_struct attach;
- attach.owner = current;
- vhost_work_init(&attach.work, vhost_attach_cgroups_work);
- vhost_work_queue(dev, &attach.work);
- vhost_work_flush(dev, &attach.work);
- return attach.ret;
+ struct vhost_attach_cgroups_struct attach;
+
+ attach.owner = current;
+ vhost_work_init(&attach.work, vhost_attach_cgroups_work);
+ vhost_work_queue(dev, &attach.work);
+ vhost_work_flush(dev, &attach.work);
+ return attach.ret;
}
/* Caller should have device mutex */
@@ -323,11 +330,13 @@ static long vhost_dev_set_owner(struct vhost_dev *dev)
{
struct task_struct *worker;
int err;
+
/* Is there an owner already? */
if (dev->mm) {
err = -EBUSY;
goto err_mm;
}
+
/* No owner, become one */
dev->mm = get_task_mm(current);
worker = kthread_create(vhost_worker, dev, "vhost-%d", current->pid);
@@ -380,6 +389,7 @@ long vhost_dev_reset_owner(struct vhost_dev *dev)
void vhost_dev_cleanup(struct vhost_dev *dev)
{
int i;
+
for (i = 0; i < dev->nvqs; ++i) {
if (dev->vqs[i].kick && dev->vqs[i].handle_kick) {
vhost_poll_stop(&dev->vqs[i].poll);
@@ -421,6 +431,7 @@ void vhost_dev_cleanup(struct vhost_dev *dev)
static int log_access_ok(void __user *log_base, u64 addr, unsigned long sz)
{
u64 a = addr / VHOST_PAGE_SIZE / 8;
+
/* Make sure 64 bit math will not overflow. */
if (a > ULONG_MAX - (unsigned long)log_base ||
a + (unsigned long)log_base > ULONG_MAX)
@@ -461,6 +472,7 @@ static int memory_access_ok(struct vhost_dev *d, struct vhost_memory *mem,
int log_all)
{
int i;
+
for (i = 0; i < d->nvqs; ++i) {
int ok;
mutex_lock(&d->vqs[i].mutex);
@@ -527,6 +539,7 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
{
struct vhost_memory mem, *newmem, *oldmem;
unsigned long size = offsetof(struct vhost_memory, regions);
+
if (copy_from_user(&mem, m, size))
return -EFAULT;
if (mem.padding)
@@ -544,7 +557,8 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
return -EFAULT;
}
- if (!memory_access_ok(d, newmem, vhost_has_feature(d, VHOST_F_LOG_ALL))) {
+ if (!memory_access_ok(d, newmem,
+ vhost_has_feature(d, VHOST_F_LOG_ALL))) {
kfree(newmem);
return -EFAULT;
}
@@ -560,6 +574,7 @@ static int init_used(struct vhost_virtqueue *vq,
struct vring_used __user *used)
{
int r = put_user(vq->used_flags, &used->flags);
+
if (r)
return r;
return get_user(vq->last_used_idx, &used->idx);
@@ -849,6 +864,7 @@ static const struct vhost_memory_region *find_region(struct vhost_memory *mem,
{
struct vhost_memory_region *reg;
int i;
+
/* linear search is not brilliant, but we really have on the order of 6
* regions in practice */
for (i = 0; i < mem->nregions; ++i) {
@@ -871,6 +887,7 @@ static int set_bit_to_user(int nr, void __user *addr)
void *base;
int bit = nr + (log % PAGE_SIZE) * 8;
int r;
+
r = get_user_pages_fast(log, 1, 1, &page);
if (r < 0)
return r;
@@ -888,6 +905,7 @@ static int log_write(void __user *log_base,
{
u64 write_page = write_address / VHOST_PAGE_SIZE;
int r;
+
if (!write_length)
return 0;
write_length += write_address % VHOST_PAGE_SIZE;
@@ -1037,8 +1055,8 @@ static int get_indirect(struct vhost_dev *dev, struct vhost_virtqueue *vq,
i, count);
return -EINVAL;
}
- if (unlikely(memcpy_fromiovec((unsigned char *)&desc, vq->indirect,
- sizeof desc))) {
+ if (unlikely(memcpy_fromiovec((unsigned char *)&desc,
+ vq->indirect, sizeof desc))) {
vq_err(vq, "Failed indirect descriptor: idx %d, %zx\n",
i, (size_t)indirect->addr + i * sizeof desc);
return -EINVAL;
@@ -1153,7 +1171,7 @@ int vhost_get_vq_desc(struct vhost_dev *dev, struct vhost_virtqueue *vq,
i, vq->num, head);
return -EINVAL;
}
- ret = copy_from_user(&desc, vq->desc + i, sizeof desc);
+ ret = __copy_from_user(&desc, vq->desc + i, sizeof desc);
if (unlikely(ret)) {
vq_err(vq, "Failed to get descriptor: idx %d addr %p\n",
i, vq->desc + i);
@@ -1317,6 +1335,7 @@ int vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads,
void vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq)
{
__u16 flags;
+
/* Flush out used index updates. This is paired
* with the barrier that the Guest executes when enabling
* interrupts. */
@@ -1361,6 +1380,7 @@ bool vhost_enable_notify(struct vhost_virtqueue *vq)
{
u16 avail_idx;
int r;
+
if (!(vq->used_flags & VRING_USED_F_NO_NOTIFY))
return false;
vq->used_flags &= ~VRING_USED_F_NO_NOTIFY;
@@ -1387,6 +1407,7 @@ bool vhost_enable_notify(struct vhost_virtqueue *vq)
void vhost_disable_notify(struct vhost_virtqueue *vq)
{
int r;
+
if (vq->used_flags & VRING_USED_F_NO_NOTIFY)
return;
vq->used_flags |= VRING_USED_F_NO_NOTIFY;
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-29 15:18:45 +0300