linux-kernel - Re: [PATCH V10 4/5] arm64: apei: implement arch_apei_get_mem

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Date:	Fri, 7 Aug 2015 19:57:38 +0100
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	"Zhang, Jonathan Zhixiong" <zjzhang@...eaurora.org>
Cc:	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>, Fu Wei <fu.wei@...aro.org>,
	Al Stone <al.stone@...aro.org>, Borislav Petkov <bp@...en8.de>,
	Matt Fleming <matt.fleming@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
	Timur Tabi <timur@...eaurora.org>
Subject: Re: [PATCH V10 4/5] arm64: apei: implement
 arch_apei_get_mem_attributes()

On Fri, 07 Aug, at 11:16:03AM, Zhang, Jonathan Zhixiong wrote:
> 
> On some (future) arm64 platforms, APEI/GHES region may have full
> coherent access by platform. In such case, the APEI/GHES region have
> the same memory attributes as the rest of system RAM, such region
> do not need to be advised by UEFI as separate entry, but as part of
> system RAM memory region.
> That being said, for arm64 platforms that do not have WB capability
> for APEI/GHES region, such region should be mapped accordingly.

OK, so what I need to know right now is whether I need to drop this
entire series from my pull request or whether you can send a patch on
top of the existing ones in the EFI 'next' branch to address the mapping
heuristic in arch_apei_get_mem_attributes().

> >>Jonathan, can you please provide the EFI memory map region attributes
> >>for the GHES region that requires this series?
> [Reserved           |   |  |  |  |   |  |  |  |UC]

Assuming this memmap entry is indicative of most GHES region on arm64
right now, I think it's worth taking this patch as-is and addressing the
issue Ard raised as a separate patch.

Does that work?

-- 
Matt Fleming, Intel Open Source Technology Center
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