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vdpa: support exposing the count of vqs to userspace

Browse source 
- GET_VQS_COUNT: the count of virtqueues that exposed

Signed-off-by: Longpeng <longpeng2@huawei.com>
Link: https://lore.kernel.org/r/20220315032553.455-4-longpeng2@huawei.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Longpeng &lt;<a href="mailto:longpeng2@huawei.com" target="_blank">longpeng2@huawei.com</a>&gt;<br>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
This commit is contained in:
Longpeng 2022-03-15 11:25:53 +08:00 committed by Michael S. Tsirkin
parent 81d46d6931
commit b04d910af3
2 changed files with 16 additions and 0 deletions
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13
drivers/vhost/vdpa.c
View file

@ -373,6 +373,16 @@ static long vhost_vdpa_get_config_size(struct vhost_vdpa *v, u32 __user *argp)
return 0;
}
static long vhost_vdpa_get_vqs_count(struct vhost_vdpa *v, u32 __user *argp)
{
struct vdpa_device *vdpa = v->vdpa;
if (copy_to_user(argp, &vdpa->nvqs, sizeof(vdpa->nvqs)))
return -EFAULT;
return 0;
}
static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
void __user *argp)
{
@ -513,6 +523,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
case VHOST_VDPA_GET_CONFIG_SIZE:
r = vhost_vdpa_get_config_size(v, argp);
break;
case VHOST_VDPA_GET_VQS_COUNT:
r = vhost_vdpa_get_vqs_count(v, argp);
break;
default:
r = vhost_dev_ioctl(&v->vdev, cmd, argp);
if (r == -ENOIOCTLCMD)

3
include/uapi/linux/vhost.h
View file

@ -154,4 +154,7 @@
/* Get the config size */
#define VHOST_VDPA_GET_CONFIG_SIZE _IOR(VHOST_VIRTIO, 0x79, __u32)
/* Get the count of all virtqueues */
#define VHOST_VDPA_GET_VQS_COUNT _IOR(VHOST_VIRTIO, 0x80, __u32)
#endif