Re: [PATCH 1/2] viridian: remove implicit limit of 64 VPs per partition

[Jan Beulich <jbeulich@xxxxxxxx>]

On 11.01.2021 14:34, Igor Druzhinin wrote:
> On 11/01/2021 09:16, Jan Beulich wrote:
>> On 11.01.2021 10:12, Paul Durrant wrote:
>>>> From: Paul Durrant <xadimgnik@xxxxxxxxx>
>>>> Sent: 11 January 2021 09:10
>>>>
>>>>> From: Jan Beulich <jbeulich@xxxxxxxx>
>>>>> Sent: 11 January 2021 09:00
>>>>>
>>>>> On 11.01.2021 09:45, Paul Durrant wrote:
>>>>>> You can add my R-b to the patch.
>>>>>
>>>>> That's the unchanged patch then, including the libxl change that
>>>>> I had asked about and that I have to admit I don't fully follow
>>>>> Igor's responses? I'm hesitant to give an ack for that aspect of
>>>>> the change, yet I suppose the libxl maintainers will defer to
>>>>> x86 ones there. Alternatively Andrew or Roger could of course
>>>>> ack this ...
>>>>>
>>>>
>>>> I don't think we really need specific control in xl.cfg as this is a fix 
>>>> for some poorly documented
>>>> semantics in the spec. The flag simply prevents the leaf magically 
>>>> appearing on migrate and I think
>>>> that's enough.
>>>
>>> ... although adding an option in xl/libxl isn't that much work, I suppose.
>>>
>>> Igor, would you be ok plumbing it through?
>>
>> This back and forth leaves unclear to me what I should do. I
>> would have asked on irc, but you're not there as it seems.
> 
> I don't see a scenario where somebody would want to opt out of unlimited
> VPs per domain given the leaf with -1 is supported on all Windows versions.

So Paul - commit patch as is then?

> I can make it configurable in the future if reports re-surface it causes
> troubles somewhere.

This is the slight concern I have: Having to make it configurable
once someone has reported trouble would look a little late to me.
Otoh I agree it may end up being dead code if no problems get
ever encountered.

Jan