From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Ard Biesheuvel <ardb+git@google.com>
Cc: linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Ard Biesheuvel <ardb@kernel.org>, Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v2 0/7] arm64: Make EFI calls preemptible
Date: Mon, 15 Sep 2025 10:52:44 +0200 [thread overview]
Message-ID: <20250915085244.JLUfpdSP@linutronix.de> (raw)
In-Reply-To: <20250905133035.275517-9-ardb+git@google.com>
On 2025-09-05 15:30:36 [+0200], Ard Biesheuvel wrote:
> From: Ard Biesheuvel <ardb@kernel.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
next prev parent reply other threads:[~2025-09-15 8:52 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-05 13:30 [PATCH v2 0/7] arm64: Make EFI calls preemptible Ard Biesheuvel
2025-09-05 13:30 ` [PATCH v2 1/7] efi: Add missing static initializer for efi_mm::cpus_allowed_lock Ard Biesheuvel
2025-09-05 13:30 ` [PATCH v2 2/7] efi/runtime: Return success/failure from arch_efi_call_virt_setup() Ard Biesheuvel
2025-09-05 13:30 ` [PATCH v2 3/7] efi/runtime: Deal with arch_efi_call_virt_setup() returning failure Ard Biesheuvel
2025-09-05 13:30 ` [PATCH v2 4/7] arm64/fpsimd: Don't warn when EFI execution context is preemptible Ard Biesheuvel
2025-09-05 13:30 ` [PATCH v2 5/7] arm64/efi: Use a semaphore to protect the EFI stack and FP/SIMD state Ard Biesheuvel
2025-09-05 13:44 ` Peter Zijlstra
2025-09-05 13:54 ` Ard Biesheuvel
2025-09-08 15:37 ` Peter Zijlstra
2025-09-05 13:30 ` [PATCH v2 6/7] arm64/efi: Move uaccess en/disable out of efi_set_pgd() Ard Biesheuvel
2025-09-05 13:30 ` [PATCH v2 7/7] arm64/efi: Call EFI runtime services without disabling preemption Ard Biesheuvel
2025-09-05 15:45 ` [PATCH v2 0/7] arm64: Make EFI calls preemptible Yeoreum Yun
2025-09-15 8:52 ` Sebastian Andrzej Siewior [this message]
2025-09-15 9:05 ` Ard Biesheuvel
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