[RFC PATCH 7/7] arm64/efi: Call EFI runtime services without disabling preemption

[Ard Biesheuvel]

On Mon, 14 Jul 2025 at 20:55, Peter Zijlstra <peterz at infradead.org> wrote:
>
> On Mon, Jul 14, 2025 at 12:20:30PM +1000, Ard Biesheuvel wrote:
> > On Fri, 11 Jul 2025 at 23:48, Peter Zijlstra <peterz at infradead.org> wrote:
...
> > > 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