On 16/11/2017 16:23, Tony Krowiak wrote:
> On 11/14/2017 08:57 AM, Cornelia Huck wrote:
>> On Tue, 31 Oct 2017 15:39:09 -0400
>> Tony Krowiak <[email protected]> wrote:
>>
>>> On 10/13/2017 01:38 PM, Tony Krowiak wrote:
>>> Ping
>>>> Tony Krowiak (19):
>>>> KVM: s390: SIE considerations for AP Queue virtualization
>>>> KVM: s390: refactor crypto initialization
>>>> s390/zcrypt: new AP matrix bus
>>>> s390/zcrypt: create an AP matrix device on the AP matrix bus
>>>> s390/zcrypt: base implementation of AP matrix device driver
>>>> s390/zcrypt: register matrix device with VFIO mediated device
>>>> framework
>>>> KVM: s390: introduce AP matrix configuration interface
>>>> s390/zcrypt: support for assigning adapters to matrix mdev
>>>> s390/zcrypt: validate adapter assignment
>>>> s390/zcrypt: sysfs interfaces supporting AP domain assignment
>>>> s390/zcrypt: validate domain assignment
>>>> s390/zcrypt: sysfs support for control domain assignment
>>>> s390/zcrypt: validate control domain assignment
>>>> KVM: s390: Connect the AP mediated matrix device to KVM
>>>> s390/zcrypt: introduce ioctl access to VFIO AP Matrix driver
>>>> KVM: s390: interface to configure KVM guest's AP matrix
>>>> KVM: s390: validate input to AP matrix config interface
>>>> KVM: s390: New ioctl to configure KVM guest's AP matrix
>>>> s390/facilities: enable AP facilities needed by guest
>> I think the approach is fine, and the code also looks fine for the most
>> part. Some comments:
>>
>> - various patches can be squashed together to give a better
>> understanding at a glance
> Which patches would you squash?
>> - this needs documentation (as I already said)
> My plan is to take the cover letter patch and incorporate that into
> documentation,
> then replace the cover letter patch with a more concise summary.
>> - some of the driver/device modelling feels a bit awkward (commented in
>> patches) -- I'm not sure that my proposal is better, but I think we
>> should make sure the interdependencies are modeled correctly
> I am responding to each patch review individually.
I think that instead of responding to each patch individually we should
have a discussion on the design because I think a lot could change and
discussing about each patch as they may be completely redesigned for the
next version may not be very useful.
So I totally agree with Conny on that we should stabilize the
bus/device/driver modeling.
I think it would be here a good place to start the discussion on things
like we started to discuss, Harald and I, off-line:
- why a matrix bus, in which case we can avoid it
- which kind of devices we need
- how to handle the repartition of queues on boot, reset and hotplug
- interaction with the host drivers
- validation of the matrix for guests and host views
or even features we need to add like
- interruptions
- PAPQ/TAPQ-t and APQI interception
- virtualization of the AP
- CPU model and KVM capabilities
In my understanding these points must be cleared before we really start
to discuss the details of the implementation.
Best regards,
Pierre
>> - some minor stuff
>>
>
--
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany
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