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vhost: add helper to parse userspace vring state/file

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The next patches add new vhost worker ioctls which will need to get a
vhost_virtqueue from a userspace struct which specifies the vq's index.
This moves the vhost_vring_ioctl code to do this to a helper so it can
be shared.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Message-Id: <20230626232307.97930-14-michael.christie@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Mike Christie 2023-06-26 18:23:03 -05:00 committed by Michael S. Tsirkin
parent 27eca18911
commit cef25866f4
1 changed files with 22 additions and 7 deletions
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29
drivers/vhost/vhost.c
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@ -599,6 +599,27 @@ static struct vhost_worker *vhost_worker_create(struct vhost_dev *dev)
return NULL;
}
static int vhost_get_vq_from_user(struct vhost_dev *dev, void __user *argp,
struct vhost_virtqueue **vq, u32 *id)
{
u32 __user *idxp = argp;
u32 idx;
long r;
r = get_user(idx, idxp);
if (r < 0)
return r;
if (idx >= dev->nvqs)
return -ENOBUFS;
idx = array_index_nospec(idx, dev->nvqs);
*vq = dev->vqs[idx];
*id = idx;
return 0;
}
/* Caller should have device mutex */
long vhost_dev_set_owner(struct vhost_dev *dev)
{
@ -1618,21 +1639,15 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg
struct file *eventfp, *filep = NULL;
bool pollstart = false, pollstop = false;
struct eventfd_ctx *ctx = NULL;
u32 __user *idxp = argp;
struct vhost_virtqueue *vq;
struct vhost_vring_state s;
struct vhost_vring_file f;
u32 idx;
long r;
r = get_user(idx, idxp);
r = vhost_get_vq_from_user(d, argp, &vq, &idx);
if (r < 0)
return r;
if (idx >= d->nvqs)
return -ENOBUFS;
idx = array_index_nospec(idx, d->nvqs);
vq = d->vqs[idx];
if (ioctl == VHOST_SET_VRING_NUM ||
ioctl == VHOST_SET_VRING_ADDR) {