linux-kernel - Re: [PATCH 0/2] efi: Enhance capsule loader to support signed Quark images

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Message-ID: <CAHp75Vd-1RLX+-saZcK1+zMtAUEMDLo+QCiKhfCnr+_u6DSmmA@mail.gmail.com>
Date:   Tue, 28 Feb 2017 17:27:40 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Bryan O'Donoghue" <pure.logic@...us-software.ie>
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        "Kweh, Hock Leong" <hock.leong.kweh@...el.com>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>,
        "Ong, Boon Leong" <boon.leong.ong@...el.com>,
        "Mok, Tze Siong" <tze.siong.mok@...el.com>
Subject: Re: [PATCH 0/2] efi: Enhance capsule loader to support signed Quark images

On Tue, Feb 28, 2017 at 5:07 PM, Bryan O'Donoghue
<pure.logic@...us-software.ie> wrote:
> On 28/02/17 13:36, Andy Shevchenko wrote:
>> On Tue, Feb 28, 2017 at 3:35 PM, Andy Shevchenko
>> <andy.shevchenko@...il.com> wrote:
>>> On Tue, Feb 28, 2017 at 3:25 PM, Ard Biesheuvel
>>> <ard.biesheuvel@...aro.org> wrote:
>>>> On 28 February 2017 at 12:29, Matt Fleming <matt@...eblueprint.co.uk> wrote:
>>>>> On Tue, 28 Feb, at 01:20:25PM, Jan Kiszka wrote:
>>>
>>>> As I said before, I'd be ok with it if we select it compile time,
>>>> i.e., no runtime logic that infers whether we are running on such a
>>>> system or not, and no carrying both implementations in all kernels
>>>> that have capsule loading built in.
>>>
>>> Actually it most likely that Quark kernel (kernel compiled to be run
>>> on Quark) will be ever used on the rest of (modern) x86 since it's
>>> 486+ architecture (kernel has specific option for it, 586TSC).
>>
>> + it's UP only!
>>
>>> So, we might just be dependent or chosen by Quark.
>>
>
> Still though the current ia32 kernel runs on Quark and all other ia32
> systems.

How come? Quark has a silicon bug (SMP kernel might oops) and it is
not even i586!

> It would be a pity/shame to make this feature dependent on
> compiling a Quark specific kernel, after all its only a header on a
> capsule as opposed to a large hardware-level architectural divergence.
>

> I'd still like us to try for a low-fat hook that would a big fat ia32
> kernel just work without having to force a user compile up a
> Quark-specific kernel.

Can you elaborate how to run i686 kernel (which is default for x86
32-bit AFAIK) on Quark?

-- 
With Best Regards,
Andy Shevchenko