linux-kernel - Re: [PATCH] x86/irq: Lower unhandled irq error severity

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Date:   Tue, 1 Dec 2020 08:36:06 -0600
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Laurențiu Nicola <lnicola@...d.ro>
Cc:     mingo@...nel.org, bp@...en8.de, x86@...nel.org, trivial@...nel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/irq: Lower unhandled irq error severity

On 11/30/20 5:34 PM, Thomas Gleixner wrote:
> On Mon, Nov 30 2020 at 19:22, Laurențiu Nicola wrote:
>> On Mon, Nov 30, 2020, at 18:56, Thomas Gleixner wrote:
>>>> That's right, sorry. It still boots, but it's no longer "quiet",
>>>> that's what I meant.
>>>
>>> Right, but surpressing that is not a solution.
>>
>> I'm just downgrading it from "emergency" to "error". It will still be
>> displayed for most users snd anyone looking in dmesg. But I'm unlikely
>> to convince my motherboard manufacturer to fix this in the BIOS, and
>> the errors are basically unactionable and uninformative (unlike say
>> "can't set up page mappings" or "your CPU might be on fire" which
>> would really imply a crash soon).
> 
> The point is that for some cases this can result in a non working
> machine which just hangs and if it's below the usual loglevel cutoff,
> then it's not visible, which is more annoying than a non-quiet boot if
> you're affected.
> 
> We are looking into a way to mitigate that AMD wreckage, but so far we
> don't even know where exactly this comes from. The reason why we are
> pretty sure that it is a BIOS/Firmware issue is that some people
> reported it to be gone after a BIOS update and quite some machines do
> not have this issue at all.

Thomas has reported this to me previously and I have reported it to our
BIOS team. That previously reported problem has been fixed in BIOS, but
I'm not sure at what AGESA level the fix will be rolled out.

@Laurențiu, what is the exact model of the processor you are running?

Thanks,
Tom

> 
> Just for completeness sake. Can you provide the line in /proc/interrupts
> for irq 7 on that machine?
> 
> Thanks,
> 
>         tglx
>