linux

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Tony Krowiak 7f9a267c67 s390/vfio-ap: No need to disable IRQ after queue reset

commit 6c12a6384e0c0b96debd88b24028e58f2ebd417b upstream.

The queues assigned to a matrix mediated device are currently reset when:

* The VFIO_DEVICE_RESET ioctl is invoked
* The mdev fd is closed by userspace (QEMU)
* The mdev is removed from sysfs.

Immediately after the reset of a queue, a call is made to disable
interrupts for the queue. This is entirely unnecessary because the reset of
a queue disables interrupts, so this will be removed.

Furthermore, vfio_ap_irq_disable() does an unconditional PQAP/AQIC which
can result in a specification exception (when the corresponding facility
is not available), so this is actually a bugfix.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
[pasic@linux.ibm.com: minor rework before merging]
Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Fixes: ec89b55e3bce ("s390: ap: implement PAPQ AQIC interception in kernel")
Cc: <stable@vger.kernel.org>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2021-02-03 23:25:57 +01:00

ap_bus.c

s390/zcrypt: move ap device reset from bus to driver code

2020-02-05 21:22:44 +00:00

ap_bus.h

s390/zcrypt: fix card and queue total counter wrap

2020-03-05 16:43:36 +01:00

ap_card.c

s390/zcrypt: fix card and queue total counter wrap

2020-03-05 16:43:36 +01:00

ap_debug.h

…