Re: [PATCH v19 12/20] s390/vfio-ap: allow hot plug/unplug of AP devices when assigned/unassigned

[Jason J. Herne]

On 4/4/22 18:10, Tony Krowiak wrote:
> Let's hot plug an adapter, domain or control domain into the guest when it
> is assigned to a matrix mdev that is attached to a KVM guest. Likewise,
> let's hot unplug an adapter, domain or control domain from the guest when
> it is unassigned from a matrix_mdev that is attached to a KVM guest.
>
> Whenever an assignment or unassignment of an adapter, domain or control
> domain is performed, the APQNs and control domains assigned to the matrix
> mdev will be filtered and assigned to the AP control block
> (APCB) that supplies the AP configuration to the guest so that no
> adapter, domain or control domain that is not in the host's AP
> configuration nor any APQN that does not reference a queue device bound
> to the vfio_ap device driver is assigned.
>
> After updating the APCB, if the mdev is in use by a KVM guest, it is
> hot plugged into the guest to dynamically provide access to the adapters,
> domains and control domains provided via the newly refreshed APCB.
>
> Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
> ---
>   drivers/s390/crypto/vfio_ap_ops.c | 112 +++++++++++++++---------------
>   1 file changed, 57 insertions(+), 55 deletions(-)

Seems sane.

Reviewed-by: Jason J. Herne <jjherne@xxxxxxxxxxxxx>