linux-kernel - Re: [PATCH v13 09/15] s390/vfio-ap: allow hot plug/unplug of AP resources using mdev device

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Message-ID: <20210112185550.1ac49768.pasic@linux.ibm.com>
Date:   Tue, 12 Jan 2021 18:55:50 +0100
From:   Halil Pasic <pasic@...ux.ibm.com>
To:     Tony Krowiak <akrowiak@...ux.ibm.com>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, freude@...ux.ibm.com, borntraeger@...ibm.com,
        cohuck@...hat.com, mjrosato@...ux.ibm.com,
        alex.williamson@...hat.com, kwankhede@...dia.com,
        fiuczy@...ux.ibm.com, frankja@...ux.ibm.com, david@...hat.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com
Subject: Re: [PATCH v13 09/15] s390/vfio-ap: allow hot plug/unplug of AP
 resources using mdev device

On Tue, 12 Jan 2021 02:12:51 +0100
Halil Pasic <pasic@...ux.ibm.com> wrote:

> > @@ -1347,8 +1437,11 @@ void vfio_ap_mdev_remove_queue(struct ap_device *apdev)
> >  	apqi = AP_QID_QUEUE(q->apqn);
> >  	vfio_ap_mdev_reset_queue(apid, apqi, 1);
> >  
> > -	if (q->matrix_mdev)
> > +	if (q->matrix_mdev) {
> > +		matrix_mdev = q->matrix_mdev;
> >  		vfio_ap_mdev_unlink_queue(q);
> > +		vfio_ap_mdev_refresh_apcb(matrix_mdev);
> > +	}
> >  
> >  	kfree(q);
> >  	mutex_unlock(&matrix_dev->lock);  

Shouldn't we first remove the queue from the APCB and then
reset? Sorry, I missed this one yesterday.

Regards,
Halil