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Message-ID: <20150927070644.GC26125@gmail.com>
Date:	Sun, 27 Sep 2015 09:06:44 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	Matt Fleming <matt@...eblueprint.co.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Mark Rutland <mark.rutland@....com>,
	Mark Salter <msalter@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Brian Gerst <brgerst@...il.com>
Subject: Re: [PATCH 2/2] arm64/efi: Don't pad between EFI_MEMORY_RUNTIME
 regions


* Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:

> > If we allocate the EFI runtime as a single virtual memory block then issues 
> > like rounding between sections does not even come up as a problem: we map the 
> > original offsets and sizes byte by byte.
> 
> Well, by that reasoning, we should not call SetVirtualAddressMap() in the first 
> place, and just use the 1:1 mapping UEFI uses natively. This is more than 
> feasible on arm64, and I actually fought hard against using 
> SetVirtualAddressMap() at all, but I was overruled by others. I think this is 
> also trivially possible on X64, since the 1:1 mapping is already active 
> alongside the VA mapping.

Could we please re-list all the arguments pro and contra of 1:1 physical mappings, 
in a post that also explains the background so that more people can chime in, not 
just people versed in EFI internals? It's very much possible that a bad decision 
was made.

Thanks,

	Ingo
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