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    SubjectRe: [PATCH v19 17/20] s390/vfio-ap: handle config changed and scan complete notification
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    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@linux.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@linux.ibm.com>

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

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