From mboxrd@z Thu Jan  1 00:00:00 1970
From: Cornelia Huck <cohuck@redhat.com>
Subject: Re: [PATCH v8 17/22] s390: vfio-ap: zeroize the AP queues.
Date: Fri, 10 Aug 2018 11:14:45 +0200
Message-ID: <20180810111445.015fcf2a.cohuck@redhat.com>
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Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, freude@de.ibm.com, schwidefsky@de.ibm.com,
        heiko.carstens@de.ibm.com, borntraeger@de.ibm.com,
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        thuth@redhat.com, pasic@linux.vnet.ibm.com, berrange@redhat.com,
        fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com,
        frankja@linux.ibm.com, Tony Krowiak <akrowiak@linux.ibm.com>
To: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
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On Wed,  8 Aug 2018 10:44:27 -0400
Tony Krowiak <akrowiak@linux.vnet.ibm.com> wrote:

> From: Tony Krowiak <akrowiak@linux.ibm.com>
> 
> Let's call PAPQ(ZAPQ) to zeroize a queue:
> 
> * For each queue configured for a mediated matrix device
>   when it is released.
> 
> Zeroizing a queue resets the queue, clears all pending
> messages for the queue entries and disables adapter interruptions
> associated with the queue.
> 
> Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
> Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
> Tested-by: Michael Mueller <mimu@linux.ibm.com>
> Tested-by: Farhan Ali <alifm@linux.ibm.com>
> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---
>  drivers/s390/crypto/vfio_ap_ops.c     |   29 ++++++++++++++++++++++++++++-
>  drivers/s390/crypto/vfio_ap_private.h |   25 +++++++++++++++++++++++++
>  2 files changed, 53 insertions(+), 1 deletions(-)
> 

> @@ -788,7 +812,10 @@ static void vfio_ap_mdev_release(struct mdev_device *mdev)
>  {
>  	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
>  
> -	kvm_arch_crypto_clear_masks(matrix_mdev->kvm);
> +	if (matrix_mdev->kvm)
> +		kvm_arch_crypto_clear_masks(matrix_mdev->kvm);

Confused. Why is the check for matrix_mdev->kvm added here?

> +
> +	vfio_ap_mdev_reset_queues(mdev, true);
>  	vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
>  				 &matrix_mdev->group_notifier);
>  	matrix_mdev->kvm = NULL;