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

[Sudeep Holla]

On Sat, Jul 04, 2026 at 08:43:39AM +0200, Daniel Lezcano wrote:
> 
> 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.
> > 

I still need the above to understand the issue/constraint better.

> > 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 ?
> 

I meant constraint based on secure context.

-- 
Regards,
Sudeep