Commit b04d910a authored by Longpeng's avatar Longpeng Committed by Michael S. Tsirkin
Browse files

vdpa: support exposing the count of vqs to userspace 



- GET_VQS_COUNT: the count of virtqueues that exposed

Signed-off-by: default avatarLongpeng <longpeng2@huawei.com>
Link: https://lore.kernel.org/r/20220315032553.455-4-longpeng2@huawei.com


Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Acked-by: default avatarJason Wang <jasowang@redhat.com>
Signed-off-by: default avatarLongpeng &amp;lt;&lt;a href="mailto:longpeng2@huawei.com" <target="_blank"&gt;longpeng2@huawei.com&lt;/a&gt;&amp;gt;&lt;br>
Reviewed-by: default avatarStefano Garzarella <sgarzare@redhat.com>
parent 81d46d69

drivers/vhost/vdpa.c

+13 −0
Original line number Diff line number Diff line
@@ -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)

include/uapi/linux/vhost.h

+3 −0
Original line number Diff line number Diff line
@@ -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