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Re: [PATCH v10 4/6] arm/sysctl: Implement cpu hotplug ops
- To: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 26 Oct 2026 10:20:28 +0100
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, 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>, Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- Delivery-date: Mon, 26 Oct 2026 09:20:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 23.10.2026 03:09, Volodymyr Babchuk wrote:
> Mykyta Poturai <Mykyta_Poturai@xxxxxxxx> writes:
>> --- a/xen/common/Kconfig
>> +++ b/xen/common/Kconfig
>> @@ -648,8 +648,8 @@ config SYSTEM_SUSPEND
>>
>> config CPU_ONLINE_OFFLINE
>> bool "CPU online/offline support" if EXPERT
>> - depends on X86
>> - default y
>> + depends on !ARM || (!HAS_ITS && !TEE)
>
> I don't think this is correct, unless RISC-V also support this.
I think this can be looked at both ways: Yours or "RISC-V implements
arch_cpu_keep_online()" (even if only as a stub right now). If there
were constraints there, they'd be added here as a 2nd "depends on"
if and when the stub is converted to a proper function.
> Maybe introduce HAS_CPUONLINE_OFFLINE as we do for similar features?
Irrespective of the above that's certainly an option. It might also
help with the unreachable code issue pointed out earlier.
Jan
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