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Re: [PATCH] xen/arm, xen/common: Add Kconfig option to control Dom0 boot
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Oleksii Moisieiev <Oleksii_Moisieiev@xxxxxxxx>
- Date: Wed, 23 Jul 2025 15:48:16 +0000
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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>, Oleksandr Tyshchenko <Oleksandr_Tyshchenko@xxxxxxxx>, "amd-xen-safety@xxxxxxxxx" <amd-xen-safety@xxxxxxxxx>
- Delivery-date: Wed, 23 Jul 2025 15:48:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHb+9rNCD0pdC1VhE+OyU7cYZL/l7Q/xA4AgAAB2ACAAAiFgIAADEcA
- Thread-topic: [PATCH] xen/arm, xen/common: Add Kconfig option to control Dom0 boot
On 23/07/2025 18:04, Jan Beulich wrote:
> On 23.07.2025 16:33, Oleksii Moisieiev wrote:
>> Hi Jan,
>>
>> On 23/07/2025 17:27, Jan Beulich wrote:
>>> On 23.07.2025 16:05, Oleksii Moisieiev wrote:
>>>> --- a/xen/arch/arm/Kconfig
>>>> +++ b/xen/arch/arm/Kconfig
>>>> @@ -19,6 +19,7 @@ config ARM
>>>> select HAS_ALTERNATIVE if HAS_VMAP
>>>> select HAS_DEVICE_TREE
>>>> select HAS_DOM0LESS
>>>> + select HAS_DOM0
>>> This wants to move one line up, for the set to remain sorted. But see below.
>>>
>>>> --- a/xen/common/Kconfig
>>>> +++ b/xen/common/Kconfig
>>>> @@ -21,6 +21,14 @@ 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
>>>> + depends on HAS_DOM0 && HAS_DEVICE_TREE && DOMAIN_BUILD_HELPERS
>>>> + default y
>>>> + help
>>>> + Dom0 boot support enables Xen to boot to the control domain (Dom0) and
>>>> + manage domU guests using the Xen toolstack with provided
>>>> configurations.
>>> What about non-Arm? x86 has a Dom0 too, but doesn't select HAS_DOM0. It
>>> actually requires a Dom0 for now, so to me HAS_DOM0 is a misnomer. Maybe
>>> HAS_OPTIONAL_DOM0?
>> Right now DOM0_BOOT is the only option for x86 so I've made the changes
>> only for arm.
> But this aspect of x86 isn't reflected in the option properties above. Imo
> at this point x86 should have this option set to Y unconditionally.
>
> Jan
Fair enough. However, this will result in an empty configuration for now
on x86.
I can add it if you’re okay with that.
--
Oleksii
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