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Re: [PATCH v1 05/25] xen: introduce CONFIG_DOMCTL


  • To: "Penny, Zheng" <penny.zheng@xxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Mon, 4 Aug 2025 10:38:23 +0200
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  • Cc: "Huang, Ray" <Ray.Huang@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, "Orzel, Michal" <Michal.Orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Mon, 04 Aug 2025 08:38:30 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 04.08.2025 10:29, Penny, Zheng wrote:
> [Public]
> 
>> -----Original Message-----
>> From: Jan Beulich <jbeulich@xxxxxxxx>
>> Sent: Monday, August 4, 2025 3:41 PM
>> To: Penny, Zheng <penny.zheng@xxxxxxx>
>> Cc: Huang, Ray <Ray.Huang@xxxxxxx>; Andrew Cooper
>> <andrew.cooper3@xxxxxxxxxx>; Anthony PERARD <anthony.perard@xxxxxxxxxx>;
>> Orzel, Michal <Michal.Orzel@xxxxxxx>; Julien Grall <julien@xxxxxxx>; Roger 
>> Pau
>> Monné <roger.pau@xxxxxxxxxx>; Stefano Stabellini <sstabellini@xxxxxxxxxx>; 
>> xen-
>> devel@xxxxxxxxxxxxxxxxxxxx
>> Subject: Re: [PATCH v1 05/25] xen: introduce CONFIG_DOMCTL
>>
>> On 03.08.2025 11:47, Penny Zheng wrote:
>>> --- a/xen/common/Kconfig
>>> +++ b/xen/common/Kconfig
>>> @@ -627,6 +627,10 @@ config SYSCTL
>>>       This option shall only be disabled on some dom0less systems, or
>>>       PV shim on x86, to reduce Xen footprint.
>>>
>>> +config DOMCTL
>>> +   bool "Enable domctl hypercall"
>>> +   def_bool y
>>> +
>>
>> Just to re-iterate - we don't think we want things to be this fine-grained.
>> (As an aside, nit: "bool" and "def_bool" are partly redundant with one
>> another.)
>>
> 
> Are we suggesting to use one Kconfig, maybe like CONFIG_XENCTL(not a good 
> choice, just popping in my head...), to wrap all scenarios, including 
> sysctl-op, domctl-op, jiqian's platform-op, etc ?

Yes, that's the thought that was circulated, and that I had hoped Stefano
would have conveyed.

> In which case, maybe we still submit commits(or features) serie by serie, 
> more easy to review,  but only when all is completed, we make this Kconfig as 
> an selectable option ?

Likely the best route, but that may then mean stepping back a little on
SYSCTL, before trying to deal with SYSCTL and maybe PLATFORM_OP (albeit I
raised further reservations there).

Jan



 


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