Commit 4eba0eab authored by jiangdongxu's avatar jiangdongxu
Browse files

vhost-vdpa: add uAPI for device buffer 

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I86ITO



----------------------------------------------------------------------

These new ioctl add support for saving/loading device status from
usersapce.

When vhost-vdpa device start migration, VMM need to call these ioctl to
save/load device status of vhost-vdpa devices if these ops is
implemented.

Signed-off-by: default avatarjiangdongxu <jiangdongxu1@huawei.com>
parent f05bc135

drivers/vhost/vdpa.c

+71 −0
Original line number Diff line number Diff line
@@ -567,6 +567,68 @@ static long vhost_vdpa_resume(struct vhost_vdpa *v) 
	return ops->resume(vdpa);

}



static int vhost_vdpa_get_dev_buffer_size(struct vhost_vdpa *v,

					  uint32_t __user *argp)

{

	struct vdpa_device *vdpa = v->vdpa;

	const struct vdpa_config_ops *ops = vdpa->config;

	uint32_t size;



	if (!ops->get_dev_buffer_size)

		return -EOPNOTSUPP;



	size = ops->get_dev_buffer_size(vdpa);



	if (copy_to_user(argp, &size, sizeof(size)))

		return -EFAULT;



	return 0;

}



static int vhost_vdpa_get_dev_buffer(struct vhost_vdpa *v,

				     struct vhost_vdpa_config __user *c)

{

	struct vdpa_device *vdpa = v->vdpa;

	const struct vdpa_config_ops *ops = vdpa->config;

	struct vhost_vdpa_config config;

	int ret;

	unsigned long size = offsetof(struct vhost_vdpa_config, buf);



	if (copy_from_user(&config, c, size))

		return -EFAULT;



	if (!ops->get_dev_buffer)

		return -EOPNOTSUPP;



	down_read(&vdpa->cf_lock);

	ret = ops->get_dev_buffer(vdpa, config.off, c->buf, config.len);

	up_read(&vdpa->cf_lock);



	return ret;

}



static int vhost_vdpa_set_dev_buffer(struct vhost_vdpa *v,

				     struct vhost_vdpa_config __user *c)

{

	struct vdpa_device *vdpa = v->vdpa;

	const struct vdpa_config_ops *ops = vdpa->config;

	struct vhost_vdpa_config config;

	int ret;

	unsigned long size = offsetof(struct vhost_vdpa_config, buf);



	if (copy_from_user(&config, c, size))

		return -EFAULT;



	if (!ops->set_dev_buffer)

		return -EOPNOTSUPP;



	down_write(&vdpa->cf_lock);

	ret = ops->set_dev_buffer(vdpa, config.off, c->buf, config.len);

	up_write(&vdpa->cf_lock);



	return ret;

}



static long vhost_vdpa_set_log_base(struct vhost_vdpa *v, u64 __user *argp)

{

	struct vdpa_device *vdpa = v->vdpa;
@@ -818,6 +880,15 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, 
	case VHOST_VDPA_RESUME:

		r = vhost_vdpa_resume(v);

		break;

	case VHOST_GET_DEV_BUFFER_SIZE:

		r = vhost_vdpa_get_dev_buffer_size(v, argp);

		break;

	case VHOST_GET_DEV_BUFFER:

		r = vhost_vdpa_get_dev_buffer(v, argp);

		break;

	case VHOST_SET_DEV_BUFFER:

		r = vhost_vdpa_set_dev_buffer(v, argp);

		break;

	default:

		r = vhost_dev_ioctl(&v->vdev, cmd, argp);

		if (r == -ENOIOCTLCMD)

include/uapi/linux/vhost.h

+5 −0
Original line number Diff line number Diff line
@@ -192,4 +192,9 @@ 
 */

#define VHOST_VDPA_RESUME		_IO(VHOST_VIRTIO, 0x7E)



/* set and get device buffer */

#define VHOST_GET_DEV_BUFFER _IOR(VHOST_VIRTIO, 0xb0, struct vhost_vdpa_config)

#define VHOST_SET_DEV_BUFFER _IOW(VHOST_VIRTIO, 0xb1, struct vhost_vdpa_config)

#define VHOST_GET_DEV_BUFFER_SIZE _IOR(VHOST_VIRTIO, 0xb3, __u32)



#endif