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Re: [PATCH v3 22/23] xen/Kconfig: introduce HAS_STATIC_MEMORY
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 25 Jun 2026 08:10:08 +0200
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- Cc: Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 25 Jun 2026 06:10:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24.06.2026 17:26, Oleksii Kurochko wrote:
> On 6/23/26 10:26 AM, Jan Beulich wrote:
>> On 17.06.2026 13:17, Oleksii Kurochko wrote:
>>> Architectures that implement guest_physmap_add_pages() select
>>> HAS_STATIC_MEMORY; STATIC_MEMORY then depends on it. ARM selects the
>>> new flag; RISC-V does not, so CONFIG_STATIC_MEMORY is unavailable there
>>> and randconfig builds no longer require an explicit STATIC_MEMORY=n
>>> override to avoid a compilation error.
>>
>> How did you come up with the connection to guest_physmap_add_pages()?
>
> It is because of you mentioned in this sentense ...
>
>> That's a close sibling of guest_physmap_add_page(), and they all should
>> fall in the same group. The fact that right now static-mem is the only
>> caller of guest_physmap_add_pages() is secondary.
> ... (the last sentence)
>
>> New callers could
>> appear. guest_physmap_add_page() could likely (in principle) be
>> implemented in terms of guest_physmap_add_pages().
>>
>> What you're after is a way to {en,dis}able STATIC_MEMORY on a per-arch
>> basis. That's all what matters here.
>
> I will reword that part in the following way:
>
> Introduce HAS_STATIC_MEMORY so that STATIC_MEMORY can be enabled or
> disabled on a per-architecture basis.
This is needed, but ...
> An architecture that supports
> static memory selects HAS_STATIC_MEMORY, and STATIC_MEMORY depends on
> it.
... this merely re-states the general concept of HAS_*, so imo would
better be omitted.
Jan
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