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Message-ID: <164f0852-3d7c-7d38-6fb2-9cacf6728ede@linux.ibm.com>
Date:   Wed, 1 Jun 2022 14:54:45 -0400
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Reply-To: jjherne@linux.ibm.com
Subject: Re: [PATCH v19 12/20] s390/vfio-ap: allow hot plug/unplug of AP
 devices when assigned/unassigned
Content-Language: en-US
To:     Tony Krowiak <akrowiak@linux.ibm.com>, linux-s390@vger.kernel.org,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc:     freude@linux.ibm.com, borntraeger@de.ibm.com, cohuck@redhat.com,
        mjrosato@linux.ibm.com, pasic@linux.ibm.com,
        alex.williamson@redhat.com, kwankhede@nvidia.com,
        fiuczy@linux.ibm.com
References: <20220404221039.1272245-1-akrowiak@linux.ibm.com>
 <20220404221039.1272245-13-akrowiak@linux.ibm.com>
From:   "Jason J. Herne" <jjherne@linux.ibm.com>
Organization: IBM
In-Reply-To: <20220404221039.1272245-13-akrowiak@linux.ibm.com>
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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@linux.ibm.com>
> ---
>   drivers/s390/crypto/vfio_ap_ops.c | 112 +++++++++++++++---------------
>   1 file changed, 57 insertions(+), 55 deletions(-)

Seems sane.

Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>