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Date:   Tue, 12 Jan 2021 17:50:19 +0100
From:   Halil Pasic <>
To:     Tony Krowiak <>
Subject: Re: [PATCH v13 10/15] s390/zcrypt: driver callback to indicate
 resource in use

On Tue, 22 Dec 2020 20:16:01 -0500
Tony Krowiak <> wrote:

> Introduces a new driver callback to prevent a root user from unbinding
> an AP queue from its device driver if the queue is in use. The callback
> will be invoked whenever a change to the AP bus's sysfs apmask or aqmask
> attributes would result in one or more AP queues being removed from its
> driver. If the callback responds in the affirmative for any driver
> queried, the change to the apmask or aqmask will be rejected with a device
> busy error.
> For this patch, only non-default drivers will be queried. Currently,
> there is only one non-default driver, the vfio_ap device driver. The
> vfio_ap device driver facilitates pass-through of an AP queue to a
> guest. The idea here is that a guest may be administered by a different
> sysadmin than the host and we don't want AP resources to unexpectedly
> disappear from a guest's AP configuration (i.e., adapters and domains
> assigned to the matrix mdev). This will enforce the proper procedure for
> removing AP resources intended for guest usage which is to
> first unassign them from the matrix mdev, then unbind them from the
> vfio_ap device driver.
> Signed-off-by: Tony Krowiak <>
> Reviewed-by: Harald Freudenberger <>

Reviewed-by: Halil Pasic <>

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