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Re: VW ELF loader

From: Paolo Bonzini
Subject: Re: VW ELF loader
Date: Thu, 6 Feb 2020 09:29:07 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1

On 05/02/20 06:58, David Gibson wrote:
>> Yes, SLOF is big and slow.  petitboot is not petit at all either, and
>> has the disadvantage that you have to find a way to run GRUB afterwards.
> Well, not usually.  Petitboot parses grub configuration itself, which
> means that generally from the OS / installer point of view it looks
> like grub, even though it's not from the actual bootstrapping point of
> view.

Ok, sorry about that.  I need to learn a bit more.

>>  But would a similarly minimal OF implementation (no network, almost no
>> interpret so no Forth, device tree built entirely in the host, etc.) be
>> just as big and slow?
> So, as actual OF implementations go, SLOF is already pretty minimal
> (hence "Slim Line Open Firmware").  If there's no Forth, it's really
> not OF any more, just something mimicing some of OF's interfaces.

Right, not unlike what you get with vof=on. :)  I'm not against at all
that idea.  I just don't understand what you refer to below as (2).
Does petitboot not have the problem because it kexecs the new kernel?


> But the difficulty of SLOF isn't really its bigness or slowness in any
> case (the slowness is just an additional irritation).  The two big
> issues are 1) that it's written in an obscure language and 2)
> synchronizing its state with things that require host side
> involvement.
> Rewriting a minimal guest side not-OF would partly address (1) (but
> there's still the logistical pain of having to build and insert it),
> and wouldn't address (2) at all.

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