From: Pingfan Liu <kernelfans@gmail.com>
To: Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Julien Thierry <julien.thierry@arm.com>
Subject: Re: [PATCH] arm64/irq: use NMI to send stop IPI
Date: Mon, 14 Dec 2020 10:20:15 +0800 [thread overview]
Message-ID: <CAFgQCTvLud2qOWfSDK_HbKwid-2uLPDA_Uz-iTQzBYiWwqJX5Q@mail.gmail.com> (raw)
In-Reply-To: <afd82be798cb55fd2f96940db7be78c0@kernel.org>
On Tue, Dec 8, 2020 at 10:04 PM Marc Zyngier <maz@kernel.org> wrote:
>
> On 2020-12-08 13:14, Pingfan Liu wrote:
> > Like other arches, both 'kexec -l' and 'kexec -p' expect to use NMI to
> > interrupt other cpus in order to capture cpus tightly to a known state.
> >
> > So for both of the cases, try to use NMI IPI if irqchip supports NMI.
>
> There are at least 2 other competing series doing the same thing,
> and (ab)using NMIs for dubious purposes (kexec, kgdb...)
>
I think kexec has a good justification, but start with (2) at present.
> (1) Please work with others instead of reinventing things from scratch,
> with similar problems
>
I will.
> (2) No additional NMI patches will make it until we have resolved the
> issues
> described in [1], which is likely to take some time
>
After serval days of chasing this issue, I have a raw idea about it.
What about re-structure the code like
DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_reschedule_ipi) ?
I will send a series soon afterward.
Thanks,
Pingfan
> Thanks,
>
> M.
>
> [1]
> https://lore.kernel.org/linux-arm-kernel/87lfewnmdz.fsf@nanos.tec.linutronix.de/
> --
> Jazz is not dead. It just smells funny...
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-12-14 2:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-08 13:14 [PATCH] arm64/irq: use NMI to send stop IPI Pingfan Liu
2020-12-08 14:04 ` Marc Zyngier
2020-12-14 2:20 ` Pingfan Liu [this message]
2020-12-14 2:25 ` [PATCH 1/3] kernel/irq: __handle_domain_irq() makes irq_enter/exit arch optional Pingfan Liu
2020-12-14 2:25 ` [PATCH 2/3] arm64/irq-gic-v3: make gic_handle_irq() cope with enter_from_kernel_mode() Pingfan Liu
2020-12-14 2:25 ` [PATCH 3/3] arm64/irq-gic-v3: make reschedule-ipi light weight Pingfan Liu
2020-12-14 9:46 ` [PATCH] arm64/irq: use NMI to send stop IPI Marc Zyngier
2020-12-14 13:04 ` Pingfan Liu
2020-12-14 13:24 ` Marc Zyngier
2020-12-15 5:40 ` Pingfan Liu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAFgQCTvLud2qOWfSDK_HbKwid-2uLPDA_Uz-iTQzBYiWwqJX5Q@mail.gmail.com \
--to=kernelfans@gmail.com \
--cc=catalin.marinas@arm.com \
--cc=julien.thierry@arm.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=mark.rutland@arm.com \
--cc=maz@kernel.org \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).