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Re: [PATCH v4 02/13] kconfig: introduce domain builder config options
- To: Alejandro Vallejo <agarciav@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 22 Apr 2025 08:57:09 +0200
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- Cc: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, 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>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 22 Apr 2025 06:57:15 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17.04.2025 18:18, Alejandro Vallejo wrote:
> On Thu Apr 17, 2025 at 4:00 PM BST, Jan Beulich wrote:
>> On 17.04.2025 14:48, Alejandro Vallejo wrote:
>>> --- /dev/null
>>> +++ b/xen/common/domain-builder/Kconfig
>>> @@ -0,0 +1,18 @@
>>> +
>>> +menu "Domain Builder Features"
>>> +depends on HAS_BOOT_INFO
>>
>> That is, what's going to further be added here will not ...
>>
>>> +config DOMAIN_BUILDER
>>
>> ...depend on this, but just on HAS_BOOT_INFO? Seems not very likely, but
>> I'll be looking forward to learn what the plans are.
>
> CONFIG_HAS_BOOT_INFO has nothing to do with future plans. The domain
> builder is tightly integrated with the boot_info infrastructure and
> cannot be used (or linked) unless the arch-specific definitions are
> present. It cannot function without it. And this movement from arch/ to
> common/ forces this new Kconfig to gate core.c on boot_info existing
> (because it's in asm/bootinfo.h atm). I _COULD_ also move the boot_info
> elsewhere, but without a drive to actually use it, that seems a bit
> pointless.
>
> HAS_BOOT_INFO && !DOMAIN_BUILDER still links core.c, because that
> contains the common initialiser for boot_info.
Which, as voiced earlier, I have reservations against. The entire
domain-builder/ sub-tree would imo better not be recursed into when
DOMAIN_BUILDER=n.
Jan
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