On Mon, 14 Jul 2025 at 20:55, Peter Zijlstra [off-list ref] wrote:

On Mon, Jul 14, 2025 at 12:20:30PM +1000, Ard Biesheuvel wrote:

quoted

On Fri, 11 Jul 2025 at 23:48, Peter Zijlstra [off-list ref] wrote:

...

quoted

quoted

Is the migrate_disable() strictly required, or just paranoia?

Runtime services might be polling the secure firmware for an async
completion when they are interrupted, and so I don't think it is
generally safe to assume that an interrupted EFI runtime service can
be resumed on another CPU.

Can we please get a comment with that migrate_disable() explaining this?

Sure