linux-kernel - Re: [x86-tip] RSDP changes converted i4790 box SMP -> UP

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Date:   Mon, 15 Jan 2018 17:29:53 +0100
From:   Gabriel C <nix.or.die@...il.com>
To:     Juergen Gross <jgross@...e.com>, Ingo Molnar <mingo@...nel.org>
Cc:     Borislav Petkov <bp@...en8.de>,
        Mike Galbraith <mgalbraith@...e.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [x86-tip] RSDP changes converted i4790 box SMP -> UP

On 15.01.2018 16:40, Juergen Gross wrote:
> On 15/01/18 16:32, Ingo Molnar wrote:
>>

Hi Juergen,

>> * Juergen Gross <jgross@...e.com> wrote:
>>
>>> On 15/01/18 15:56, Borislav Petkov wrote:
>>>> On Mon, Jan 15, 2018 at 03:52:25PM +0100, Juergen Gross wrote:
>>>>> Ingo, with my finding that above boot failure is related to a bug in
>>>>> openSUSE's grub2 (I've verified it soesn't exist in upstream grub2),
>>>>
>>>> The box I'm seeing this on has SLES12-SP2 grub:
>>>>
>>>> Version        : 2.02~beta2-115.9.1
>>>>
>>>> Does it have the same bug?
>>>
>>> The patch introducing this problem is from 2012. So I guess: yes.
>>
>> I suspect this makes it a widespread, unintended ABI. Can we detect and somehow avoid it?
>>
>> The boot protocol ABI sucks if it's fragile against such mistakes.
> 
> Well, copying sizeof(setup_header) into grub2 and then coyping back just
> 1024 bytes is plain wrong. It is a miracle nothing broke up to now.
> 

I'm not on SUSE and hit that too on an H11DSi-NT.
See: https://marc.info/?l=linux-kernel&m=151579540320553&w=2

Regards,

Gabriel C