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

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Message-ID: <ff0d07e9-282e-f6f4-a7c6-8b61012d3f4f@suse.com>
Date:   Mon, 15 Jan 2018 17:42:20 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Gabriel C <nix.or.die@...il.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 15/01/18 17:29, Gabriel C wrote:
> 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

Where does your grub come from?


Juergen