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vdpa: support exposing the config size to userspace

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- GET_CONFIG_SIZE: return the size of the virtio config space.

The size contains the fields which are conditional on feature
bits.

Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Longpeng <longpeng2@huawei.com>
Link: https://lore.kernel.org/r/20220315032553.455-2-longpeng2@huawei.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
This commit is contained in:
Longpeng 2022-03-15 11:25:51 +08:00 committed by Michael S. Tsirkin
parent f1781bedea
commit a61280dddd
3 changed files with 23 additions and 1 deletions
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17
drivers/vhost/vdpa.c
View file

@ -358,6 +358,20 @@ static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp)
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_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
void __user *argp)
{
@ -495,6 +509,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
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;
default:
r = vhost_dev_ioctl(&v->vdev, cmd, argp);
if (r == -ENOIOCTLCMD)

3
include/linux/vdpa.h
View file

@ -207,7 +207,8 @@ struct vdpa_map_file {
* @reset: Reset device
* @vdev: vdpa device
* Returns integer: success (0) or error (< 0)
* @get_config_size: Get the size of the configuration space
* @get_config_size: Get the size of the configuration space includes
* fields that are conditional on feature bits.
* @vdev: vdpa device
* Returns size_t: configuration size
* @get_config: Read from device specific configuration space

4
include/uapi/linux/vhost.h
View file

@ -150,4 +150,8 @@
/* Get the valid iova range */
#define VHOST_VDPA_GET_IOVA_RANGE _IOR(VHOST_VIRTIO, 0x78, \
struct vhost_vdpa_iova_range)
/* Get the config size */
#define VHOST_VDPA_GET_CONFIG_SIZE _IOR(VHOST_VIRTIO, 0x79, __u32)
#endif