linux-kernel - Re: [PATCH v2 0/6] s390/vfio-ap: reset queues removed from guest's AP configuration

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Message-ID: <48d70d1d-0320-4c40-b82c-3754ce6ba79a@linux.ibm.com>
Date: Tue, 2 Jan 2024 11:26:13 -0500
From: Anthony Krowiak <akrowiak@...ux.ibm.com>
To: linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc: jjherne@...ux.ibm.com, borntraeger@...ibm.com, pasic@...ux.ibm.com,
        pbonzini@...hat.com, frankja@...ux.ibm.com, imbrenda@...ux.ibm.com,
        alex.williamson@...hat.com, kwankhede@...dia.com
Subject: Re: [PATCH v2 0/6] s390/vfio-ap: reset queues removed from guest's AP
 configuration

PING! Happy New Year!

On 12/12/23 4:25 PM, Tony Krowiak wrote:
> All queues removed from a guest's AP configuration must be reset so when
> they are subsequently made available again to a guest, they re-appear in a
> reset state. There are some scenarios where this is not the case. For
> example, if a queue device that is passed through to a guest is unbound
> from the vfio_ap device driver, the adapter to which the queue is attached
> will be removed from the guest's AP configuration. Doing so implicitly
> removes all queues associated with that adapter because the AP architecture
> precludes removing a single queue. Those queues also need to be reset.
>
> This patch series ensures that all queues removed from a guest's AP
> configuration are reset for all possible scenarios.
>
> Changelog v1=> v2:
> -----------------
> * Restored Halil's Acked-by and Reviewed-by tags (Halil)
>
> * Restored Halil's code refactor of reset_queues_for_apids function in
>    patch 4
>
> Tony Krowiak (6):
>    s390/vfio-ap: always filter entire AP matrix
>    s390/vfio-ap: loop over the shadow APCB when filtering guest's AP
>      configuration
>    s390/vfio-ap: let 'on_scan_complete' callback filter matrix and update
>      guest's APCB
>    s390/vfio-ap: reset queues filtered from the guest's AP config
>    s390/vfio-ap: reset queues associated with adapter for queue unbound
>      from driver
>    s390/vfio-ap: do not reset queue removed from host config
>
>   drivers/s390/crypto/vfio_ap_ops.c     | 268 +++++++++++++++++---------
>   drivers/s390/crypto/vfio_ap_private.h |  11 +-
>   2 files changed, 184 insertions(+), 95 deletions(-)
>