Re: [PATCH v5 1/1] x86/acpi, x86/boot: Add multiprocessor wake-up support

From: Kuppuswamy, Sathyanarayanan
Date: Mon May 24 2021 - 09:43:04 EST

On 5/23/21 11:40 PM, Mika Penttilä wrote:

So this isn't supporting suspend/resume if AP cannot started again?

Yes. You are correct. It can be used only once per AP. Please find the
spec reference below.

* According to the ACPI specification r6.4, sec, the
* mailbox-based wakeup mechanism cannot be used more than once
* for the same CPU, so skip sending wake commands to already
* awake CPU.

Sathyanarayanan Kuppuswamy
Linux Kernel Developer