From: Ard Biesheuvel <ardb@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
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 22:41:36 +0200 [thread overview]
Message-ID: <CAMj1kXHp7NzPfGjZg+199vR09PuQfb=da+iqhh-Ts5kf337UHQ@mail.gmail.com> (raw)
In-Reply-To: <87k0j0a1hw.ffs@tglx>
On Tue, 28 Sept 2021 at 22:28, Thomas Gleixner <tglx@linutronix.de> wrote:
>
> 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.
>
Excellent.
> 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.
>
Yes this is what Sebastian's second patch provides.
> Thanks,
>
> tglx
I'll take this as an ack from you, Thomas, and queue these up for v5.16
Thanks,
Ard.
next prev parent reply other threads:[~2021-09-28 20:41 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
2021-09-28 20:41 ` Ard Biesheuvel [this message]
2021-09-24 13:49 ` [PATCH 2/2] efi: Allow efi=runtime Sebastian Andrzej Siewior
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