linux-kernel - Re: Should arm64 have a custom crash shutdown handler?

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Date:   Thu, 5 May 2022 10:19:27 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        Marc Zyngier <maz@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        will Deacon <will@...nel.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Ard Biesheuvel <ardb@...nel.org>, broonie@...nel.org,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Subject: Re: Should arm64 have a custom crash shutdown handler?

On 05/05/2022 10:15, Mark Rutland wrote:
> [...]
> Without a strong justification, we wouldn't add such hooks to arm64.
> 
> Could you start by trying to use the notifiers, and if you encounter a problem,
> *then* we consider an alternative? That should mean we have a concrete reason.
> 
> Thanks,
> Mark.

That's a good idea Mark. I'm not expert in Hyper-V - I could try that
for a fact, but let's see if Michael has a strong reason on why this
need to be done in arch code and panic notifiers aren't enough.

Thanks,


Guilherme