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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 14:33:50 +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 14:33:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHb+9rNCD0pdC1VhE+OyU7cYZL/l7Q/xA4AgAAB2AA=
- Thread-topic: [PATCH] xen/arm, xen/common: Add Kconfig option to control Dom0 boot
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 I'm still leaving these options in common because IIUC dom0less for
x86/hyperlauch support
is in merge process right now. So once it merged this parameter could be
used for x86 arch.
>> @@ -92,6 +100,9 @@ config HAS_DEVICE_TREE
>> config HAS_DOM0LESS
>> bool
>>
>> +config HAS_DOM0
>> + bool
> Same here as to sorting, no matter that ...
>
+
>> config HAS_DIT # Data Independent Timing
>> bool
>>
> ... HAS_DOM0LESS and this one are misplaced with one another.
>
> Jan
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