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Re: [PATCH v3 14/14] kconfig: Allow x86 to pick CONFIG_DOM0LESS_BOOT
- To: Alejandro Vallejo <agarciav@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 16 Jun 2025 16:19:16 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 16 Jun 2025 14:19:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.06.2025 16:12, Alejandro Vallejo wrote:
> On Mon Jun 16, 2025 at 8:59 AM CEST, Jan Beulich wrote:
>> On 13.06.2025 17:13, Alejandro Vallejo wrote:
>>> Without picking CONFIG_HAS_DEVICE_TREE.
>>>
>>> In order to do that. Allow CONFIG_DOM0LESS_BOOT to enable a subset
>>> of the common/device-tree/ directory. x86 doesn't want dom0less-build.c,
>>> as that's tightly integrated still to the ARM way of building domains.
>>
>> Which then is grossly misleading: x86 also ought to select HAS_DEVICE_TREE
>> if it wants to use that machinery. Instead of theis an the previous patch,
>
> It wants to use a _subset_. I can't use the full machinery.
>
>> I think what we need is a new Kconfig setting to control the use of
>> dom0less-build.c.
>
> It's not just dom0less-build.c. It's critical to avoid parsing device_t's
> during the unflatten procedure (which is the few lines compiled out with
> ifdef CONFIG_DEVICE_TREE).
>
> Renaming CONFIG_HAS_DEVICE_TREE to CONFIG_HAS_PLATFORM_DT (with a suitable
> `help` message for clarity, even though it would always be enabled) should
> help clarify things.
>
> Does that sound reasonable?
Perhaps. The main input has to come from DT maintainers, though.
Jan
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