linux-kernel - Re: [PATCH 1/2] x86/efi: Map EFI memmap entries in-order at runtime

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Message-ID: <20150928061646.GA21690@gmail.com>
Date:	Mon, 28 Sep 2015 08:16:46 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	stable <stable@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Brian Gerst <brgerst@...il.com>,
	Dave Young <dyoung@...hat.com>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Jones <pjones@...hat.com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Matt Fleming <matt.fleming@...el.com>,
	Borislav Petkov <bp@...e.de>, "Lee, Chun-Yi" <jlee@...e.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	James Bottomley <JBottomley@...n.com>
Subject: Re: [PATCH 1/2] x86/efi: Map EFI memmap entries in-order at runtime


* Matthew Garrett <mjg59@...f.ucam.org> wrote:

> On Sun, Sep 27, 2015 at 09:30:48AM -0700, Andy Lutomirski wrote:
> > On Sep 26, 2015 1:19 PM, "H. Peter Anvin" <hpa@...or.com> wrote:
> > >
> > > Sadly a lot of firmware is known to fail in that configuration :(  That was very much our guest choice.
> > >
> > 
> > Why can't we map everything completely 1:1 (VA = PA) and call the
> > setVA thing but pass it literally the identity.
> 
> Last time I tried this I found that some firmware makes assumptions 
> about having high addresses.

So the question is, what does Windows do?

PC firmware is a hostile environment for Linux, to be compatible the best we can 
do is to mimic the environment that the firmware is tested under - i.e. try to use 
the firmware in the way Windows uses it.

Thanks,

	Ingo
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