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Re: [PATCH v2] docs: fusa: Add dom0less domain configuration requirements
- To: Ayan Kumar Halder <ayankuma@xxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Wed, 18 Dec 2024 14:12:12 +0000
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- Cc: Michal Orzel <michal.orzel@xxxxxxx>, Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Artem Mygaiev <artem_mygaiev@xxxxxxxx>
- Delivery-date: Wed, 18 Dec 2024 14:12:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v2] docs: fusa: Add dom0less domain configuration requirements
Hi,
> On 18 Dec 2024, at 15:09, Ayan Kumar Halder <ayankuma@xxxxxxx> wrote:
>
> Hi Bertrand/Michal,
>
> On 18/12/2024 14:00, Bertrand Marquis wrote:
>> Hi Michal,
>>
>>> On 18 Dec 2024, at 14:56, Michal Orzel <michal.orzel@xxxxxxx> wrote:
>>>
>>>
>>>
>>> On 18/12/2024 14:08, Bertrand Marquis wrote:
>>>>
>>>> Hi Ayan,
>>>>
>>>>> On 18 Dec 2024, at 12:34, Ayan Kumar Halder <ayankuma@xxxxxxx> wrote:
>>>>>
>>>>>
>>>>> On 18/12/2024 08:27, Bertrand Marquis wrote:
>>>>>> Hi Ayan,
>>>>> Hi Bertrand,
>>>>>>> On 12 Dec 2024, at 20:03, Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
>>>>>>> wrote:
>>>>>>>
>>>>>>> From: Michal Orzel <michal.orzel@xxxxxxx>
>>>>>>>
>>>>>>> Add requirements for dom0less domain creation.
>>>>>>>
>>>>>>> Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
>>>>>>> Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
>>>>>>> ---
>>> [...]
>>>
>>>>>>> +SPIs
>>>>>>> +----
>>>>>>> +
>>>>>>> +`XenSwdgn~spis~1`
>>>>>>> +
>>>>>>> +Description:
>>>>>>> +Xen shall allocate a specified number of shared peripheral interrupts
>>>>>>> for a
>>>>>>> +domain.
>>>>>> This is very ambiguous. What do you mean here ?
>>>>> Xen shall provide a way to specify the number of shared peripheral
>>>>> interrupts for a domain via the device tree .
>>>> I am lost in how you achieve such a thing in the configuration.
>>>> All you can do is assigned an interrupt to a domain, but the sharing part
>>>> I do not see what Xen has to do with it.
>>> This req is about Arm's SPIs (Shared Peripheral Interrupts) and the max
>>> number you can allocate to a domU.
>>> You can see more here:
>>> https://xenbits.xenproject.org/gitweb/?p=xen.git;a=blob;f=docs/misc/arm/device-tree/booting.txt;hb=HEAD#l172
>> Oh right, no idea how i came to shared interrupts instead of Arm SPIs.
>>
>> Then this is Arm specific and we need to have a bit more context/clear up
>> here (as comment or introduction).
>> And also this should have arm64 somewhere.
>
> ok, I can add Arm specific bits in the comments. Also, will put arm64 in the
> tag.
>
> Thinking again, this should be a product requirement as it explains the
> interface to Xen (in this case a dt property), Is this correct understanding ?
Yes it should.
>
> Also, to your other comment :-
>
>>> I start to wonder if we should create interface requirements from the guest
>>> PoV:
>
>>> A domain shall have a configurable number of vCPUs (1 to XX).
>
> This should be a product requirement as well. Correct ?
Correct.
Cheers
Bertrand
>
> - Ayan
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