Re: [PATCH v2] arm64: Disallow disabling boot CPU based on config

[Daniel Lezcano]

Hi Sudeep,

Le 03/07/2026 à 17:51, Sudeep Holla a écrit :
> (It is always good to cc all PSCI maintainer for any ARM64 CPU
> hotpug/suspend related changes)
>
> On Fri, Jul 03, 2026 at 04:50:02PM +0530, Sneh Mankad wrote:
> > The Qualcomm SoCs like LeMans, Monaco support suspend to ram which leads
> > the SoC to ACPI S3 similar state where SoC is turned off and DDR is
> > retained. The hardware design on these SoCs forces a constraint to suspend
> > and resume the system on boot CPU / CPU0.
> And you fail to explain why they have that constraint.
>
> Is it because some secure context is not allowed to migrate ?
>
> We already have a mechanism for that in place and this hack is not at all
> required.
Do you mean a mechanism for the secure context or for preventing CPU0 ?

Can you clarify ?