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Re: [PATCH 0/7] xen/mm: Normalize per-domain page counters, >16 TiB per domain
- To: Bernhard Kaindl <bernhard.kaindl@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 2 Jun 2026 14:30:28 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 02 Jun 2026 12:30:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 29.05.2026 14:43, Bernhard Kaindl wrote:
> Summary of a comment by Jan Beulich motivating this submission:
>> Considering that systems (and hence guests) only ever get larger, we
>> should consider to normalize per-domain page counters to unsigned long.
>
> This series enables supporting guests >16 TiB in the future
> once the system support for machines >16 TiB is implemented.
>
> 1. xen/mm: Normalize common per-domain page counters to unsigned long
> 2. x86/mm: Normalize X86 per-domain page counters to unsigned long
> 3. xen/mm: Static memory: Widen assign_pages(nr) to unsigned long
> 4. xen/mm: Static memory: Widen domstatic plumbing to unsigned long
> 5. xen/mm: device-tree: Widen static page counts to unsigned long
> 6. xen/arch/x86/dom0_build.c: Extend the upper limit for Dom0's max_pages
> 7. tools/libs/stat/xenstat.c: Extend the "no maximum" sentinel for max_pages
>
> This series is based on the NUMA claim sets v7 series:
> https://lists.xen.org/archives/html/xen-devel/2026-05/msg00363.html
>
> Suggested-by: Jan Beulich <jbeulich@xxxxxxxx>
> Signed-off-by: Bernhard Kaindl <bernhard.kaindl@xxxxxxxxxx>
>
> Bernhard Kaindl (7):
> xen/mm: Normalize common per-domain page counters to unsigned long
> x86/mm: Normalize X86 per-domain page counters to unsigned long
> xen/mm: Static memory: Widen assign_pages(nr) to unsigned long
> xen/mm: Static memory: Widen domstatic plumbing to unsigned long
> xen/mm: device-tree: Widen static page counts to unsigned long
> xen/arch/x86/dom0_build.c: Extend the upper limit for Dom0's max_pages
> tools/libs/stat/xenstat.c: Extend the "no maximum" sentinel for
> max_pages
Btw, I have no copy of this last patch in may mailbox. Going from the
list archive, imo using ULONG_MAX is as bad as UINT_MAX: There'll be the
same issue again when the field type changes another time. This really
needs abstracting properly, imo. Yet then I'm not a toolstack
maintainer ...
Jan
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