[edk2-devel] [PATCH v1 0/3] Add support for handling SGI and pending interrupts

[Leif Lindholm]

On 2023-08-03 16:33, Ard Biesheuvel wrote:
> On Wed, 26 Jul 2023 at 20:45, Kun Qin <kuqin12 at gmail.com> wrote:
>>
>> Hi Ard,
>>
>> Our current use case is around AP core suspension and wake-ups.
>>
>> The program can suspend the secondary cores through PSCI interfaces
>> (after powering
>> them on). BSP can then wake up the suspended cores through SGI on demand.
>>
> 
> The use of PSCI is already dubious in the context of UEFI - combining
> it with the use of SGIs for communication between cores seems like a
> slippery slope I don't think we should be going down.

Well, UEFI has no concept of multiple cores, so I don't think there's 
anything fishy about using PSCI to bring up/down APs. But I agree adding 
interrupt support, not considered by either UEFI nor PI, feels off.

What is the fundamental use-case? (Pre-)silicon testing?

/
     Leif



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