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Re: [PATCH] xen/arm, xen/common: Add Kconfig option to control Dom0 boot
- To: Oleksii Moisieiev <Oleksii_Moisieiev@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 23 Jul 2025 17:04:19 +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>, Oleksandr Tyshchenko <Oleksandr_Tyshchenko@xxxxxxxx>, "amd-xen-safety@xxxxxxxxx" <amd-xen-safety@xxxxxxxxx>
- Delivery-date: Wed, 23 Jul 2025 15:04:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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
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