Re: [Linaro-open-discussions] [RFC linux 0/5] KVM: arm64: Let userspace handle PSCI

Hi Jean,

On 20/05/2021 14:07, Jean-Philippe Brucker wrote:

The guest needs additional support to deal with hidden CPUs and to gracefully handle the "NOT_PRESENT" return value from PSCI CPU_ON. The full prototype can be found here:

There was some internal discussion on the PSCI bits..

Could we use 'DENIED' here, as its firmware policy not to allow the core to be brought online. I'm nervous that reporting 'PRESENT' in the _STA method, and 'NOT_PRESENT' from firmware is going to require us to paper over something later!

(I need to find where you posted this publicly...)

Thanks,

James