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Re: [PATCH v3] xen/arm, xen/common: Add Kconfig option to control Dom0 boot
- To: Oleksii Moisieiev <Oleksii_Moisieiev@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 25 Sep 2025 12:15:01 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 25 Sep 2025 10:15:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.09.2025 10:14, Oleksii Moisieiev wrote:
>
>
> On 25/09/2025 09:34, Jan Beulich wrote:
>> On 24.09.2025 18:00, Oleksii Moisieiev wrote:
>>> --- a/xen/common/Kconfig
>>> +++ b/xen/common/Kconfig
>>> @@ -26,6 +26,14 @@ config DOM0LESS_BOOT
>>> Xen boot without the need of a control domain (Dom0), which could be
>>> present anyway.
>>>
>>> +config DOM0_BOOT
>>> + bool "Dom0 boot support" if EXPERT
>>> + default y
>>> + depends on (ARM && HAS_DOM0 && HAS_DEVICE_TREE_DISCOVERY &&
>>> DOMAIN_BUILD_HELPERS) || (X86 && HAS_DOM0)
>> This line is too long, and really would have wanted to be broken up anyway.
>> Clearly
>> "depends on HAS_DOM0" can be separated out. I'm not quite sure about the
>> extra
>> Arm-specific dependencies: Are these two really Arm-only (as in: not also
>> affecting
>> e.g. RISC-V)? Furthermore, what if I turned this option off for x86? Doing
>> so would,
>> aiui, have no effect at all right now. An option without any effect imo
>> better
>> wouldn't be exposed.
> My intention was to introduce same behavior for both x86 and arm.
> Added this config parameter as was stated in the following reply for v1 [0]
No. What I said was "Imo at this point x86 should have this option set to Y
unconditionally." That's not what the above construct does.
Jan
> For now, since hyperlaunch is not merged yet the only option for x86 is
> Dom0 so it will
> take no effect for x86 right now.
>
> [0]https://lore.kernel.org/xen-devel/9814144b-5eb4-421a-93f3-2a15232a7dd3@xxxxxxxx/
>> Jan
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