linux-kernel - Re: [PATCH v11 13/26] s390: vfio-ap: zeroize the AP queues

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Date:   Thu, 27 Sep 2018 09:04:28 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Christian Borntraeger <borntraeger@...ibm.com>
Cc:     Tony Krowiak <akrowiak@...ux.vnet.ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, kwankhede@...dia.com,
        bjsdjshi@...ux.vnet.ibm.com, pbonzini@...hat.com,
        alex.williamson@...hat.com, pmorel@...ux.vnet.ibm.com,
        alifm@...ux.vnet.ibm.com, mjrosato@...ux.vnet.ibm.com,
        jjherne@...ux.vnet.ibm.com, thuth@...hat.com,
        pasic@...ux.vnet.ibm.com, berrange@...hat.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com,
        frankja@...ux.ibm.com, Tony Krowiak <akrowiak@...ux.ibm.com>
Subject: Re: [PATCH v11 13/26] s390: vfio-ap: zeroize the AP queues

On Wed, 26 Sep 2018 20:58:41 +0200
Christian Borntraeger <borntraeger@...ibm.com> wrote:

> On 09/26/2018 03:38 PM, Cornelia Huck wrote:
> > On Tue, 25 Sep 2018 19:16:28 -0400
> > Tony Krowiak <akrowiak@...ux.vnet.ibm.com> wrote:
> >   
> >> From: Tony Krowiak <akrowiak@...ux.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@...ux.ibm.com>
> >> Reviewed-by: Halil Pasic <pasic@...ux.ibm.com>
> >> Tested-by: Michael Mueller <mimu@...ux.ibm.com>
> >> Tested-by: Farhan Ali <alifm@...ux.ibm.com>
> >> ---
> >>  drivers/s390/crypto/vfio_ap_ops.c | 44 +++++++++++++++++++++++++++++++
> >>  1 file changed, 44 insertions(+)
(...)
> >> +static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev)
> >> +{
> >> +	int ret;
> >> +	int rc = 0;
> >> +	unsigned long apid, apqi;
> >> +	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
> >> +
> >> +	for_each_set_bit_inv(apid, matrix_mdev->matrix.apm,
> >> +			     matrix_mdev->matrix.apm_max + 1) {
> >> +		for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,
> >> +				     matrix_mdev->matrix.aqm_max + 1) {
> >> +			ret = vfio_ap_mdev_reset_queue(apid, apqi, 1);  
> > 
> > I'd still like to see a comment here:
> > 
> > /*
> >  * Regardless whether a queue turns out to be busy, or is not
> >  * operational, we need to continue resetting the remaining
> >  * queues.
> >  */  
> 
> I added your proposal to the apv11 branch.

Thanks. With that added,

Reviewed-by: Cornelia Huck <cohuck@...hat.com>