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Date: Mon, 27 May 2019 13:00:28 +0200
From: Cornelia Huck <cohuck@redhat.com>
Subject: Re: [PATCH v2 6/8] virtio/s390: add indirection to indicators
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To: Michael Mueller <mimu@linux.ibm.com>
Cc: KVM Mailing List <kvm@vger.kernel.org>, Linux-S390 Mailing List <linux-s390@vger.kernel.org>, Sebastian Ott <sebott@linux.ibm.com>, Heiko Carstens <heiko.carstens@de.ibm.com>, Halil Pasic <pasic@linux.ibm.com>, virtualization@lists.linux-foundation.org, "Michael S . Tsirkin" <mst@redhat.com>, Christoph Hellwig <hch@infradead.org>, Thomas Huth <thuth@redhat.com>, Christian Borntraeger <borntraeger@de.ibm.com>, Viktor Mihajlovski <mihajlov@linux.ibm.com>, Vasily Gorbik <gor@linux.ibm.com>, Janosch Frank <frankja@linux.ibm.com>, Claudio Imbrenda <imbrenda@linux.ibm.com>, Farhan Ali <alifm@linux.ibm.com>, Eric Farman <farman@linux.ibm.com>, Pierre Morel <pmorel@linux.ibm.com>
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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.