Re: [PATCH v2 6/8] virtio/s390: add indirection to indicators access

[Cornelia Huck <cohuck@redhat.com>]

On Thu, 23 May 2019 18:22:07 +0200
Michael Mueller <mimu@linux.ibm.com> wrote:

> From: Halil Pasic <pasic@linux.ibm.com>
> 
> This will come in handy soon when we pull out the indicators from
> virtio_ccw_device to a memory area that is shared with the hypervisor
> (in particular for protected virtualization guests).
> 
> Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
>  drivers/s390/virtio/virtio_ccw.c | 40 +++++++++++++++++++++++++---------------
>  1 file changed, 25 insertions(+), 15 deletions(-)
> 

> @@ -338,17 +348,17 @@ static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
>  		ccw->cda = (__u32)(unsigned long) thinint_area;
>  	} else {
>  		/* payload is the address of the indicators */
> -		indicatorp = kmalloc(sizeof(&vcdev->indicators),
> +		indicatorp = kmalloc(sizeof(indicators(vcdev)),
>  				     GFP_DMA | GFP_KERNEL);
>  		if (!indicatorp)
>  			return;
>  		*indicatorp = 0;
>  		ccw->cmd_code = CCW_CMD_SET_IND;
> -		ccw->count = sizeof(&vcdev->indicators);
> +		ccw->count = sizeof(indicators(vcdev));
>  		ccw->cda = (__u32)(unsigned long) indicatorp;
>  	}
>  	/* Deregister indicators from host. */
> -	vcdev->indicators = 0;
> +	*indicators(vcdev) = 0;

I'm not too hot about this notation, but it's not wrong and a minor
thing :)

>  	ccw->flags = 0;
>  	ret = ccw_io_helper(vcdev, ccw,
>  			    vcdev->is_thinint ?

Patch looks reasonable and not dependent on the other patches here.