linux-kernel - Re: [PATCH v19 17/20] s390/vfio-ap: handle config changed and scan complete notification

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Date:   Mon, 6 Jun 2022 13:50:58 -0400
From:   "Jason J. Herne" <jjherne@...ux.ibm.com>
To:     Tony Krowiak <akrowiak@...ux.ibm.com>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     freude@...ux.ibm.com, borntraeger@...ibm.com, cohuck@...hat.com,
        mjrosato@...ux.ibm.com, pasic@...ux.ibm.com,
        alex.williamson@...hat.com, kwankhede@...dia.com,
        fiuczy@...ux.ibm.com
Subject: Re: [PATCH v19 17/20] s390/vfio-ap: handle config changed and scan
 complete notification

On 4/4/22 18:10, Tony Krowiak wrote:
> This patch implements two new AP driver callbacks:
> 
> void (*on_config_changed)(struct ap_config_info *new_config_info,
>                    struct ap_config_info *old_config_info);
> 
> void (*on_scan_complete)(struct ap_config_info *new_config_info,
>                   struct ap_config_info *old_config_info);
> 
> The on_config_changed callback is invoked at the start of the AP bus scan
> function when it determines that the host AP configuration information
> has changed since the previous scan.
> 
> The vfio_ap device driver registers a callback function for this callback
> that performs the following operations:
> 
> 1. Unplugs the adapters, domains and control domains removed from the
> host's AP configuration from the guests to which they are
> assigned in a single operation.
> 
> 2. Stores bitmaps identifying the adapters, domains and control domains
> added to the host's AP configuration with the structure representing
> the mediated device. When the vfio_ap device driver's probe callback is
> subsequently invoked, the probe function will recognize that the
> queue is being probed due to a change in the host's AP configuration
> and the plugging of the queue into the guest will be bypassed.
> 
> The on_scan_complete callback is invoked after the ap bus scan is
> completed if the host AP configuration data has changed. The vfio_ap
> device driver registers a callback function for this callback that hot
> plugs each queue and control domain added to the AP configuration for each
> guest using them in a single hot plug operation.
> 
> Signed-off-by: Tony Krowiak <akrowiak@...ux.ibm.com>
> ---
>   drivers/s390/crypto/vfio_ap_drv.c     |   2 +
>   drivers/s390/crypto/vfio_ap_ops.c     | 270 +++++++++++++++++++++++++-
>   drivers/s390/crypto/vfio_ap_private.h |  12 ++
>   3 files changed, 279 insertions(+), 5 deletions(-)
> 
Reviewed-by: Jason J. Herne <jjherne@...ux.ibm.com>

-- 
-- Jason J. Herne (jjherne@...ux.ibm.com)