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Re: [PATCH v4 01/25] xen/dom0less: turn max_init_domid into a common variable
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 29 Jun 2026 16:34:21 +0200
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- Cc: Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>, Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>, 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>, Timothy Pearson <tpearson@xxxxxxxxxxxxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 29 Jun 2026 14:34:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.06.2026 17:46, Oleksii Kurochko wrote:
> Until now every architecture carried its own notion of max_init_domid:
> Arm defined a real variable (declared in asm/setup.h, defined in
> setup.c), while ppc, riscv and x86 each provided a "#define
> max_init_domid (0)" stub in their asm/setup.h. This duplicated the same
> declaration across all arches and placed a purely dom0less concept in
> arch setup headers.
>
> Now that the dom0less build code lives in common (xen/common/
> device-tree/dom0less-build.c sets max_init_domid, and the console
> serial-input switcher reads it), there is no reason for the symbol to be
> per-arch. Provide a single declaration in <xen/dom0less-build.h>, with
> the !CONFIG_DOM0LESS_BOOT stub kept there as well, so there is one source
> of truth and the arch headers no longer need to mention it. Update
> console.c to include <xen/dom0less-build.h> for the declaration instead
> of relying on asm/setup.h.
>
> Place the definition in xen/common/domid.c rather than in dom0less-
> build.c. The latter is built as dom0less-build.init.o, i.e. the whole
> object is relocated into the .init.* sections and freed after boot,
> whereas max_init_domid must outlive boot because it is read at runtime
> by the console serial-input switcher. domid.c is always linked (obj-y)
> and resides in regular (non-init) sections, so it is a correct home for
> the variable. It is marked __ro_after_init since it is only updated
> while creating boot-time domains and read-only afterwards, and guarded
> by CONFIG_DOM0LESS_BOOT as domid.c itself is unconditional.
>
> Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> ---
> Regarding last paragraph it is also alternative option just make
> dom0less-build.init.o no-init.
That would be a pretty bad move imo.
Jan
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