linux-kernel - Re: [PATCH 2/2] arm64/efi: Don't pad between EFI_MEMORY

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Message-ID: <560B3327.9020801@zytor.com>
Date:	Tue, 29 Sep 2015 17:56:07 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matt Fleming <matt@...eblueprint.co.uk>,
	Borislav Petkov <bp@...en8.de>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"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>,
	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

On 09/29/2015 07:36 AM, Matt Fleming wrote:
>  
> That's a pretty good summary for x86. I think specifically the reason
> we map the EFI memmap entries "backwards" (entry N has higher VA than
> entry N+1) is because the code was easier to write that way, but
> you'll know better than me ;-)
> 

There were two reasons:

1. The code was easier to write.
2. Windows did it that way.

Windows apparently broke and was changed due to this feature, too.

	-hpa


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