linux-kernel - Re: [PATCH] x86/efi: always map first physical page into EFI pagetables

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Date:   Wed, 25 Jan 2017 21:36:43 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Jiri Kosina <jkosina@...e.cz>
Cc:     Matt Fleming <matt@...eblueprint.co.uk>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Laura Abbott <labbott@...hat.com>,
        Vojtech Pavlik <vojtech@....cz>,
        Hanka Pavlikova <hanka@....cz>, linux-kernel@...r.kernel.org,
        linux-efi@...r.kernel.org
Subject: Re: [PATCH] x86/efi: always map first physical page into EFI
 pagetables

On Wed, Jan 25, 2017 at 09:31:53PM +0100, Jiri Kosina wrote:
> 
> [ CCing mailinglists that got eaten by my newly configured mail setup, 
>   sorry for that ]
> 
> On Wed, 25 Jan 2017, Jiri Kosina wrote:
> 
> > From: Jiri Kosina <jkosina@...e.cz>
> > 
> > Commit 129766708 ("x86/efi: Only map RAM into EFI page tables if in 
> > mixed-mode") stopped creating 1:1 mapping for all RAM in case of running 
> > in native 64bit mode.
> > 
> > It turns out though that there are 64bit EFI implementations in the wild 
> > (this particular problem has been reported on Lenovo Yoga 710-11IKB) which 
> > still make use of first physical page for their own private use (which is 
> > what legacy BIOS used to do, but EFI specification doesn't grant any such 
> > right to EFI BIOS ... oh well).

And now the same rant for the wider audience:

What is this EFI spec even? Toilet paper? Perhaps not even that.

Geez, can we simply say, firmware people, you f*cked up big time. Now
take all that crap with you to your basement, *think* hard about all the
issues we've had and then reengineer the whole thing from the beginning.
Completely anew. Then come back and we can talk.

There's a reason I don't want to deal with that major stinking pile of
crap called firmware but somehow I always get sucked back in.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--