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From: Thomas Gleixner <tglx@linutronix.de>
To: Ard Biesheuvel <ardb@kernel.org>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-efi <linux-efi@vger.kernel.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: Re: [PATCH 1/2] efi: Disable runtime services on RT
Date: Tue, 28 Sep 2021 22:28:27 +0200	[thread overview]
Message-ID: <87k0j0a1hw.ffs@tglx> (raw)
In-Reply-To: <CAMj1kXG5-i5LqnQrjK79KWZYTPO4C4fF32KhQexj8WsHLQM_Lg@mail.gmail.com>

Ard,

On Tue, Sep 28 2021 at 15:34, Ard Biesheuvel wrote:
> On Tue, 28 Sept 2021 at 15:33, Sebastian Andrzej Siewior
> <bigeasy@linutronix.de> wrote:
>>
>> On 2021-09-28 15:30:32 [+0200], Ard Biesheuvel wrote:
>> > This is generic code and the commit log only talks about arm64. How
>> > about other architectures?
>>
>> They also invoke the EFI services with disables interrupts. If they
>> provide a RTC behind spi/i2c then we end up in the same situation right?
>> Or did I misunderstand your point?
>>
> Are you sure you want to disable EFI runtime services on all x86
> systems with PREEMPT_RT as well?

I'm pretty sure because we've ran into inacceptable latencies with EFI
runtime services often enough.

Since we disabled them these complaints have gone down to 0 and nobody
so far complained about their non-availability.

We might revisit that and make them default disabled on RT and offer a
command line option to enable them for those who really want them.

Thanks,

        tglx

  parent reply	other threads:[~2021-09-28 20:28 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-24 13:49 [PATCH 0/2] efi: Disable runtime services on RT Sebastian Andrzej Siewior
2021-09-24 13:49 ` [PATCH 1/2] " Sebastian Andrzej Siewior
2021-09-28 13:30   ` Ard Biesheuvel
2021-09-28 13:33     ` Sebastian Andrzej Siewior
2021-09-28 13:34       ` Ard Biesheuvel
2021-09-28 14:24         ` Sebastian Andrzej Siewior
2021-10-20  6:09           ` joeyli
2021-10-20  6:28             ` Sebastian Andrzej Siewior
2021-10-20  6:47               ` joeyli
2021-10-20  7:20                 ` Sebastian Andrzej Siewior
2021-09-28 20:28         ` Thomas Gleixner [this message]
2021-09-28 20:41           ` Ard Biesheuvel
2021-09-24 13:49 ` [PATCH 2/2] efi: Allow efi=runtime Sebastian Andrzej Siewior

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