linux-kernel - Re: [PATCH] x86/i8259: Work around buggy legacy PIC

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Date:   Wed, 19 May 2021 05:58:53 +1000
From:   Sachi King <nakato@...ato.io>
To:     Maximilian Luz <luzmaximilian@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        David Laight <David.Laight@...lab.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sasha Levin <sashal@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH] x86/i8259: Work around buggy legacy PIC

On Tuesday, May 18, 2021 9:27:02 AM AEST Thomas Gleixner wrote:
> On Mon, May 17 2021 at 21:25, Maximilian Luz wrote:
> > On 5/17/21 8:40 PM, Thomas Gleixner wrote:
> >> Can you please add "apic=verbose" to the kernel command line and provide
> >> full dmesg output for a kernel w/o your patch and one with your patch
> >> applied?

I've linked to a dmesg with "apic=verbose" below with the irq 7 override hack 
applied.  Would you still like a copy without either of these patches applied?

What's the convention for including a dmesg on the mailing list?  I've 
included the copy via gist as pasting it into email seems incorrect, but 
that's also probably not the correct convention.

> Sachi, can you please try the hack below to confirm the above?
>
> It's not meant to be a solution, but it's the most trivial way to
> validate this.

I've applied that patch and the GPIO driver loads and functions.

The dmesg with the patch and "apic=verbose" I've placed at:
https://gist.github.com/nakato/08c6962a540d91b6f9597303d54bffe5

Thanks,
Sachi