linux-kernel - Re: [PATCH v2 0/7] arm64: Make EFI calls preemptible

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Message-ID: <20250915085244.JLUfpdSP@linutronix.de>
Date: Mon, 15 Sep 2025 10:52:44 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Ard Biesheuvel <ardb+git@...gle.com>
Cc: linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Ard Biesheuvel <ardb@...nel.org>, Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2 0/7] arm64: Make EFI calls preemptible

On 2025-09-05 15:30:36 [+0200], Ard Biesheuvel wrote:
> From: Ard Biesheuvel <ardb@...nel.org>
> 
…
> Note that this is only a partial solution in terms of RT guarantees,
> given that the runtime services execute at the same privilege level as
> the kernel, and can therefore disable interrupts (and therefore
> preemption) directly. But it should prevent scheduling latency spikes
> for EFI calls that simply take a long time to run to completion.

That sounds nice. There is no feature flag that could tell if a specific
EFI-call (or any) will disable interrupts, right? But if the source code
is available, you could check.

Sebastian