linux-kernel - Re: [PATCH v2] zcrypt: handle AP Info notification from CHSC SEI command

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Message-ID: <20190207105940.19b34df1.cohuck@redhat.com>
Date:   Thu, 7 Feb 2019 10:59:40 +0100
From:   Cornelia Huck <cohuck@...hat.com>
To:     Tony Krowiak <akrowiak@...ux.ibm.com>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        pmorel@...ux.vnet.ibm.com, pasic@...ux.vnet.ibm.com,
        akrowiak@...ux.vnet.ibm.com, oberpar@...ux.ibm.com,
        sebott@...ux.ibm.com
Subject: Re: [PATCH v2] zcrypt: handle AP Info notification from CHSC SEI
 command

On Wed,  6 Feb 2019 16:31:26 -0500
Tony Krowiak <akrowiak@...ux.ibm.com> wrote:

> The current AP bus implementation periodically polls the AP configuration
> to detect changes. When the AP configuration is dynamically changed via the
> SE or an SCLP instruction, the changes will not be reflected to sysfs until
> the next time the AP configuration is polled. The CHSC architecture
> provides a Store Event Information (SEI) command to make notification of an
> AP configuration change. This patch introduces a handler to process
> notification from the CHSC SEI command by immediately kicking off an AP bus
> scan-after-event.
> 
> Signed-off-by: Tony Krowiak <akrowiak@...ux.ibm.com>
> Reviewed-by: Halil Pasic <pasic@...ux.ibm.com>
> Reviewed-by: Sebastian Ott <sebott@...ux.ibm.com>
> ---
>  arch/s390/include/asm/ap.h   | 11 +++++++++++
>  drivers/s390/cio/chsc.c      | 13 +++++++++++++
>  drivers/s390/crypto/ap_bus.c | 11 +++++++++++
>  3 files changed, 35 insertions(+)

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