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Re: [PATCH v8 4/6] arm/sysctl: Implement cpu hotplug ops
- To: Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 15 May 2026 14:18:03 +0200
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- Cc: 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>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 15 May 2026 12:18:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15.05.2026 13:54, Mykyta Poturai wrote:
> SMT-disable enforcement check is moved into a separate
> architecture-specific function.
>
> For now this operations only support Arm64. For proper Arm32 support,
> there needs to be a mechanism to free per-cpu page tables, allocated in
> init_domheap_mappings. Also, hotplug is not supported if ITS enabled,
> and partially supported FFA, or TEE is enabled, as they use non-static
> IRQ actions.
>
> Remove ifdef guards for x86 in flask, as cpu hotplug is now
> supported on more architectures.
>
> Signed-off-by: Mykyta Poturai <mykyta_poturai@xxxxxxxx>
>
> ---
> v7->v8:
> * simplify dependencies of config CPU_ONLINE_OFFLINE
Which now raises the question of ...
> --- a/xen/common/Kconfig
> +++ b/xen/common/Kconfig
> @@ -637,9 +637,9 @@ config SYSTEM_SUSPEND
> If unsure, say N.
>
> config CPU_ONLINE_OFFLINE
> - bool "CPU online/offline support"
> - depends on X86
> - default y
> + bool "CPU online/offline support" if EXPERT
> + depends on X86 || (ARM_64 && !HAS_ITS)
... this being overly strict towards other architectures. Typically we'd
allow them to express such via select-ing a respective HAS_* control. In
the absence of that, couldn't the above be further simplified to
depends on !HAS_ITS
Alternatively, to make exclusions more explicit, and to not preclude other
ports to use HAS_ITS for something entirely different (just with the same
acronym), maybe
depends on !ARM || !HAS_ITS
? Then, if RISC-V and/or PPC really want to opt out of supporting this,
they'd add themselves here. Yes as said, expressing such via HAS_* scales
better.
> + default X86
This, I agree, wants to stay as is. At least for now.
Jan
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