linux-kernel - Re: [PATCH v8 03/16] s390/vfio-ap: manage link between queue struct and matrix mdev

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Message-ID: <f87a4326-ffd7-18b8-e128-2a583421cb1d@linux.ibm.com>
Date:   Wed, 17 Jun 2020 08:10:23 -0400
From:   Tony Krowiak <akrowiak@...ux.ibm.com>
To:     Christian Borntraeger <borntraeger@...ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     freude@...ux.ibm.com, cohuck@...hat.com, mjrosato@...ux.ibm.com,
        pasic@...ux.ibm.com, alex.williamson@...hat.com,
        kwankhede@...dia.com, fiuczy@...ux.ibm.com
Subject: Re: [PATCH v8 03/16] s390/vfio-ap: manage link between queue struct
 and matrix mdev



On 6/16/20 1:50 PM, Christian Borntraeger wrote:
>
> On 05.06.20 23:39, Tony Krowiak wrote:
> [...]
>> +static void vfio_ap_mdev_link_queues(struct ap_matrix_mdev *matrix_mdev,
>> +				     enum qlink_type type,
>> +				     unsigned long qlink_id)
>> +{
>> +	unsigned long id;
>> +	struct vfio_ap_queue *q;
>> +
>> +	switch (type) {
>> +	case LINK_APID:
>> +	case UNLINK_APID:
>> +		for_each_set_bit_inv(id, matrix_mdev->matrix.aqm,
>> +				     matrix_mdev->matrix.aqm_max + 1) {
>> +			q = vfio_ap_get_queue(AP_MKQID(qlink_id, id));
>> +			if (q) {
>> +				if (type == LINK_APID)
>> +					q->matrix_mdev = matrix_mdev;
>> +				else
>> +					q->matrix_mdev = NULL;> +			}
>> +		}
>> +		break;
>> +	default:
> Can you rather use
> 	case LINK_APQI:
> 	case UNLINK_APQI:
>
> and add a default case with a WARN_ON_ONCE?

Yes I can.

>
>> +		for_each_set_bit_inv(id, matrix_mdev->matrix.apm,
>> +				     matrix_mdev->matrix.apm_max + 1) {
>> +			q = vfio_ap_get_queue(AP_MKQID(id, qlink_id));
>> +			if (q) {
>> +				if (type == LINK_APQI)
>> +					q->matrix_mdev = matrix_mdev;
>> +				else
>> +					q->matrix_mdev = NULL;
>> +			}
>> +		}
>> +		break;
>> +	}
>> +}
>> +