From: Halil Pasic <pasic@linux.ibm.com>
To: Tony Krowiak <akrowiak@linux.ibm.com>
Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, freude@linux.ibm.com,
borntraeger@de.ibm.com, cohuck@redhat.com,
mjrosato@linux.ibm.com, alex.williamson@redhat.com,
kwankhede@nvidia.com, fiuczy@linux.ibm.com,
frankja@linux.ibm.com, david@redhat.com, hca@linux.ibm.com,
gor@linux.ibm.com
Subject: Re: [PATCH v13 10/15] s390/zcrypt: driver callback to indicate resource in use
Date: Tue, 12 Jan 2021 17:50:19 +0100 [thread overview]
Message-ID: <20210112175019.3e8de88c.pasic@linux.ibm.com> (raw)
In-Reply-To: <20201223011606.5265-11-akrowiak@linux.ibm.com>
On Tue, 22 Dec 2020 20:16:01 -0500
Tony Krowiak <akrowiak@linux.ibm.com> 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 <akrowiak@linux.ibm.com>
> Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
next prev parent reply other threads:[~2021-01-12 16:51 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-23 1:15 [PATCH v13 00/15] s390/vfio-ap: dynamic configuration support Tony Krowiak
2020-12-23 1:15 ` [PATCH v13 01/15] s390/vfio-ap: clean up vfio_ap resources when KVM pointer invalidated Tony Krowiak
2020-12-23 1:15 ` [PATCH v13 02/15] s390/vfio-ap: No need to disable IRQ after queue reset Tony Krowiak
2021-01-11 16:32 ` Halil Pasic
2021-01-13 17:06 ` Tony Krowiak
2021-01-13 21:21 ` Halil Pasic
2021-01-14 0:46 ` Tony Krowiak
2021-01-14 3:13 ` Halil Pasic
2020-12-23 1:15 ` [PATCH v13 03/15] s390/vfio-ap: move probe and remove callbacks to vfio_ap_ops.c Tony Krowiak
2020-12-23 1:15 ` [PATCH v13 04/15] s390/vfio-ap: use new AP bus interface to search for queue devices Tony Krowiak
2020-12-23 1:15 ` [PATCH v13 05/15] s390/vfio-ap: manage link between queue struct and matrix mdev Tony Krowiak
2021-01-11 19:17 ` Halil Pasic
2021-01-13 21:41 ` Tony Krowiak
2021-01-14 2:50 ` Halil Pasic
2021-01-14 21:10 ` Tony Krowiak
2020-12-23 1:15 ` [PATCH v13 06/15] s390/vfio-ap: allow assignment of unavailable AP queues to mdev device Tony Krowiak
2021-01-11 20:40 ` Halil Pasic
2021-01-14 17:54 ` Tony Krowiak
2021-01-15 1:08 ` Halil Pasic
2021-01-15 1:44 ` Halil Pasic
2021-03-31 14:36 ` Tony Krowiak
2020-12-23 1:15 ` [PATCH v13 07/15] s390/vfio-ap: introduce shadow APCB Tony Krowiak
2021-01-11 22:50 ` Halil Pasic
2021-01-14 21:35 ` Tony Krowiak
2020-12-23 1:15 ` [PATCH v13 08/15] s390/vfio-ap: sysfs attribute to display the guest's matrix Tony Krowiak
2021-01-11 22:58 ` Halil Pasic
2021-01-28 21:29 ` Tony Krowiak
2020-12-23 1:16 ` [PATCH v13 09/15] s390/vfio-ap: allow hot plug/unplug of AP resources using mdev device Tony Krowiak
2021-01-12 1:12 ` Halil Pasic
2021-01-12 17:55 ` Halil Pasic
2021-02-01 14:41 ` Tony Krowiak
2021-02-03 23:13 ` Tony Krowiak
2021-02-04 0:21 ` Halil Pasic
2020-12-23 1:16 ` [PATCH v13 10/15] s390/zcrypt: driver callback to indicate resource in use Tony Krowiak
2021-01-12 16:50 ` Halil Pasic [this message]
2020-12-23 1:16 ` [PATCH v13 11/15] s390/vfio-ap: implement in-use callback for vfio_ap driver Tony Krowiak
2021-01-12 1:20 ` Halil Pasic
2021-01-12 14:14 ` Matthew Rosato
2021-01-12 16:49 ` Halil Pasic
2020-12-23 1:16 ` [PATCH v13 12/15] s390/zcrypt: Notify driver on config changed and scan complete callbacks Tony Krowiak
2021-01-12 16:58 ` Halil Pasic
2020-12-23 1:16 ` [PATCH v13 13/15] s390/vfio-ap: handle host AP config change notification Tony Krowiak
2021-01-12 18:39 ` Halil Pasic
2020-12-23 1:16 ` [PATCH v13 14/15] s390/vfio-ap: handle AP bus scan completed notification Tony Krowiak
2021-01-12 18:44 ` Halil Pasic
2020-12-23 1:16 ` [PATCH v13 15/15] s390/vfio-ap: update docs to include dynamic config support Tony Krowiak
2021-01-06 15:16 ` [PATCH v13 00/15] s390/vfio-ap: dynamic configuration support Tony Krowiak
2021-01-07 14:41 ` Halil Pasic
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